• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A vehicle lamp (1) has a semiconductor laser element (9) configured to emit laser light; a condenser lens (11) configured to condense the laser light; a phosphor (13) configured to form white light by converting the wavelength of at least a portion of the condensed laser light, and a reflector (7) configured to reflect white light. A scattered light forming portion (23) is formed on a surface of the reflector (7), which is a surface on which a path obtained by extending the optical path of the laser light before the laser light strikes the phosphor (13) cut the reflector (7).
    公开号:FR3034498A1
    申请号:FR1652859
    申请日:2016-04-01
    公开日:2016-10-07
    发明作者:Akihiro Nomura；Tsukasa Tokida；Yuichi Shibata；Yukihiro Onoda；Takayuki Yagi；Satoshi Yamamura；Toshiaki Tsuda
    申请人:Koito Manufacturing Co Ltd；
    IPC主号:
    专利说明:

    [0001] BACKGROUND TECHNICAL FIELD [0001] The present invention relates to a vehicle lamp having a semiconductor laser element as a light source and more particularly to a vehicle lamp for generating white light by combining a semiconductor laser element. and a phosphor. STATE OF THE ART [0002] In a vehicle lamp such as a car headlight, an attempt has been made to use a laser diode (DL) instead of a light emitting diode (LED) (see patent document 1). Since a DL light source has a high light conversion efficiency and a small light emission area, the DL light source is advantageous for miniaturization of the lamp. In the vehicle lamp using the DL light source, laser light, for example blue laser light is radiated by a DL element to a phosphor which is a wavelength converting element, light for example, yellow light is emitted because of the excitation of the phosphor and the blue laser light and the yellow light are mixed, so as to emit white light. Laser light is a high energy light having a high directivity. When used as the light of a vehicle headlight or the like, as described above, the laser light strikes the phosphor and is dispersed. In this way, the laser light is converted into a white light that is suitable for illuminating the surface of a road and has appropriate energy. When the laser light does not sufficiently strike the phosphor, the high energy laser light is reflected by the reflector and is radiated to a pedestrian, a vehicle, or the road surface or the like in front of the vehicle. To avoid such a situation, the phosphor is securely attached to a mounting body to prevent it from being detached or damaged. [0004] To avoid direct radiation of high energy laser light, various methods have been used including a method of solidly attaching the phosphor to the mounting body described above, so that the phosphor is not detached or damaged. . However, although the possibility of occurrence is extremely low, it is difficult to guarantee that detachment of the phosphor is entirely avoided. To confirm (in other words, to detect an anomaly) that the phosphor is operating properly, i.e., the laser light strikes the phosphor and is properly dispersed, a light detector is generally installed at a location. An optical path is required to measure the amount of energy (light intensity) or the wavelength of the light, thereby verifying the presence or absence of an abnormality. When an anomaly is detected and it is determined that high energy laser light is radiated without striking the phosphor, it is considered that the phosphor is detached or damaged for some reason, thereby interrupting the control of the laser element . [0005] In addition, it has been suggested that high energy laser light be prevented from being reflected back by the reflector by forming a through-hole penetrating into the reflector or an exhaust hole (reference number H2 in patent document 1) in the reflector, which is struck by the laser light in an abnormal situation and thus allowing the laser light to escape to the outside of the reflector. [0006] Patent Document 1: Japanese Patent Open Publication No. 2014-180886. [0007] However, there is a problem such that the high energy laser light is reflected by the reflector and is directly radiated forward when the light detector is not present, the light detector is damaged or the detector of light is not quickly activated. In addition, in the case of the formation of the exhaust hole described above, there is a disadvantage that a portion of the white light reaching the reflector during normal driving is lost.
    [0002] In addition, there is a possibility that the laser light escaping out of the reflector in an abnormal situation be reflected several times for each element and finally, that the high energy laser light is radiated outwardly. a lamp chamber.
    [0003] SUMMARY [0009] Examples of embodiments of the invention relate to a vehicle lamp which is capable of preventing the laser light from being reflected by the reflector and being directly radiated forwardly even. when a phosphor is detached from a predetermined position or even when the phosphor is damaged so that it can not perform a normal function. [0010] A vehicle lamp according to a first aspect of the invention comprises: a semiconductor laser element configured to emit laser light; a condenser lens configured to condense the laser light; A phosphor configured to form white light by converting the wavelength of at least a portion of the condensed laser light; and a reflector configured to reflect white light, wherein a scattered light forming portion is formed on a surface of the reflector, which is a surface on which a path obtained by extending the optical path of the laser light before the light laser strikes the phosphor cuts the reflector. [Operation]) In such a configuration, in a normal situation, i.e. when the phosphor is fixed in a predetermined position and 3034498 4 serves to convert the wavelength of at least a portion From the laser light, the high directivity of the high energy laser light is weakened, generating a low energy white light, and the white light strikes the reflector over a relatively wide area, so that virtually all of the white light is reflected forward, illuminating the surface of the road or the like. However, when the phosphor is detached from a predetermined position or the luminophore is functionally deteriorated, even when it is present in the predetermined position, in the configuration of the state of the art such as the scattered light is not formed in the surface of the reflector, high energy laser light is directly reflected or laser light which is not sufficiently converted into lower energy light is concentrated on a very narrow range of the reflector and is directly reflected. As a result, the high energy laser light is radiated to the road surface or a pedestrian or the like. On the contrary, the present invention is configured as follows. Specifically, there is a case in which the phosphor is detached or is functionally deteriorated and thus, laser light (e.g., short blue or purple wavelength laser light) intended to be converted to light. Low energy striking the phosphor approaches a very narrow range of the reflector while retaining high energy. Even in this case, since the scattered light forming portion is formed in a surface of the reflector corresponding to the optical light path extension path, substantially all of the laser light is diffusely reflected by striking the laser light portion. dispersed light formation and is dispersed substantially in all directions within the reflector. With this dispersion, the directivity of the laser light is suppressed and the laser light is converted into low energy scattered light. In this way, the high energy laser light is in no way radiated forward. In this case, most of the scattered light is not directly radiated forward from the lamp chamber solely by a reflection by the reflector. A significant amount of scattered light is radiated forwardly from the multi-reflective lamp chamber by the reflector or the like. In normal driving, the white light is reflected by the scattered light forming portion and thus scattered light is generated. For the same reason, substantially all of the scattered light can be used to radiate forward, so that loss rarely occurs. The dispersed light forming portion is shaped so that substantially all of the laser light reaching the scattered light forming portion strikes the scattered light forming portion. Normal laser light has different angles of divergence in the vertical and horizontal directions of a transmitter and its radiation pattern is generated in elliptical or rectangular form. It is therefore desirable that the dispersed light-forming portion has an elliptical or rectangular shape slightly larger than the elliptical shape of the laser light reaching the reflector. In addition, in the present configuration, it is unnecessary to form in the reflector an opening corresponding to the exhaust hole of the associated technique. In particular, the white light, whose wavelength is converted into a normal control, in no case reaches the outside of the reflector and is thus consumed unnecessarily. It is therefore possible to contribute to the improvement of energy efficiency. According to a second aspect of the invention, the dispersed light forming portion is an auxiliary phosphor disposed on the surface of the reflector. [Operation] The auxiliary phosphor may be the same as the phosphor specified in the first or different aspect. In the present configuration, high energy laser light reaching the vicinity of the reflector in an abnormal situation is dispersed by striking the auxiliary phosphor. As a result, the directivity of the laser light is suppressed and low energy scattered light is generated. In this way, the high energy laser light is not radiated forward. In addition, since the wavelength of the high energy laser light is converted by striking the auxiliary phosphor, the low energy laser light is generated prior to scattering. When the auxiliary phosphor is the same as the phosphor, the scattered light becomes white light and thus the same light is obtained as in the normal situation. According to a third aspect of the invention, the scattered light forming part is a curved surface or an irregular surface which is formed on the surface of the reflector. [Operation] The curved surface or irregular surface of the present configuration may be formed by forming and fixing on the surface of the reflector the same material or material different from that of the reflector, or by integrally molding a reflector having a curved surface or an uneven surface, or by scraping and roughening the surface of the reflector, or the like. In the present configuration, the high energy laser light that is radiated to the curved surface or the irregular surface in an abnormal situation is dispersed in respective surfaces to generate scattered light. Accordingly, similarly, the high energy laser light is not radiated forward. According to a fourth aspect of the invention, the scattered light forming part is a diffusion agent disposed on the surface of the reflector. [Operation] The scattering agent of the present configuration comprises any material producing the dispersion of light on the surface of the reflector. The diffusion agent may be formed by deposition and drying of a solvent including fine particles in suspension with light diffusing ability on the surface of the reflector or by deposition and drying of paint on the surface of the reflector. According to a fifth aspect of the invention, in place of the dispersed light-forming part described in the first aspect, a diffraction grating is disposed on the surface of the reflector. [Operation] The diffraction grating is a spectral element in which a large number of parallel irregular grooves of the order of one micrometer are formed on the surface. The diffraction grating can diffract light of a specific wavelength in a specific direction.
    [0004] In the present configuration, the diffraction grating, in which fine parallel grooves corresponding to the target wavelength of the laser light are formed, is arranged by connection or the like on the location of the surface of the reflector towards which laser light is radiated in an abnormal situation. In this way, from the laser light which does not strike the phosphor or strikes the functionally deteriorated phosphor, and thus, reaches the vicinity of the reflector while maintaining a high energy, the light corresponding to the target wavelength is diffracted in a direction different from the forward direction of the diffraction grating. As a result, the high energy laser light is prevented from being radiated outwardly of the lamp chamber. [0025] According to a sixth aspect of the invention, the vehicle lamp further comprises: at least one light detector, in which, from the light radiated towards the diffraction grating, the light of a range of Specific wavelengths are diffracted and guided towards the one or both light detectors or more. [0026] 35 (Operation) 3034498 8 Although the low energy of laser light can be achieved using the inventions described in the first to fifth aspect, it is undesirable to leave the vehicle lamp when the phosphor is loose or damaged. In the present configuration, light of a specific wavelength that is diffracted in a specific direction by the diffraction grating is detected by the light detector, thereby recognizing an anomaly of the phosphor. In addition, by informing a driver of the anomaly using an alarm or the like, it is possible to quickly process the anomaly. According to a seventh aspect of the invention, the vehicle lamp further comprises: a flap provided between the phosphor and the scattered light forming portion or the diffraction grating, the flap having a needle hole therein the needle hole being formed in such a way that a straight line connecting the maximum expected movement position of the condensation lens and the outer edge of the scattered light-forming part or the diffraction grating passes through the interior of the needle hole. [Operation] In the vehicle lamp where the scattered light forming part or the diffraction grating is formed, when the direction of emission of the laser light by the laser element is a constant direction, generally the vertical direction, the laser light strikes the scattered light-forming part or the diffraction grating and thus, the high-energy laser light is not radiated out of the lamp chamber, even if the phosphor is detached and thus, the laser light reaches the vicinity of the reflector. This operation is the same as that described above. However, when the laser element is inclined and the direction of emission of the laser light is shifted with respect to the vertical direction, the direction of movement of the laser light is also inclined. Accordingly, there is a possibility for the laser light to reach the surface of the reflector where the scattered light forming portion or the diffraction grating is not present. In this case, as in the present configuration, the shutter comprising the needle hole is installed so that a straight line connecting the maximum expected movement position of the condenser lens as a base point laser light path and the outer edge of the scattered light forming portion or the diffraction grating passes through the interior of the needle hole. In other words, the needle hole is formed so that all of the laser light emitted by the condenser lens and passing through the needle hole reaches the scattered light forming portion or the diffraction grating. With this configuration, the laser light, which is emitted by the laser element and reaches the outside of the region of the scattered light forming part or the diffraction grating when the needle hole is not present and the laser element is tilted or moved horizontally, is blocked by the flap with the needle hole and thus can not reach the dispersed light-forming part or the diffraction grating. As a result, the high energy laser light is prevented from being reflected by the reflector and radiated forward. In the vehicle lamp according to the present invention, the scattered light forming portion or the diffraction grating is disposed in the reflector. In this way, high energy laser light, which can reach the reflector in an abnormal situation, is converted to low energy light and is scattered or diffracted to the interior of the reflector. As a result, it is possible to prevent the high energy laser light from being radiated towards the front of the lamp chamber. In addition, since it is not necessary to form a laser light through hole equivalent to an exhaust hole of the state of the art in the reflector, it is possible to efficiently use the generated light. [0031] In addition, according to one aspect of the present embodiment in which the needle hole is formed, it is possible to prevent the laser light from being radiated forward due to the inclination or a movement of the laser element.
    [0005] BRIEF DESCRIPTION OF THE DRAWINGS The invention will be better understood and its advantages will be better understood on reading the detailed description which follows. The description refers to the following drawings, which are given by way of example. Fig. 1 is a side view in longitudinal section of a vehicle lamp according to an embodiment of the present invention. Figs. 2A to 2C are side views, respectively, in partial longitudinal section of vehicle lamps according to other embodiments of the present invention. Figure 3 is a longitudinal sectional side view of a vehicle lamp according to yet another embodiment of the present invention. FIG. 4 is a longitudinal sectional front view of the vehicle lamp shown in FIG. 3. FIGS. 5A and 5B are respectively longitudinal sectional side views of a vehicle lamp according to yet another embodiment. of the present invention.
    [0006] DETAILED DESCRIPTION [0033] An embodiment of the present invention will next be described. As shown in FIG. 1, a projector-type vehicle lamp 1 according to a first embodiment comprises a light-emitting device 3, a projection lens 5 disposed on an optical axis extending in the forward direction. A light emitting device 3 comprises a semiconductor laser element 9 for emitting laser light, a condenser lens 11 for condensing the laser light from the semiconductor laser element. 9 and a luminophore 13. The light from the condenser lens 11 is radiated to the phosphor 13 and is transmitted upwardly through the phosphor 13. The semiconductor laser element 9 is a semiconductor light emitting element for emit laser light. For example, an element is used to emit laser light of a blue emission wavelength (about 450 nm) or laser light of a near ultraviolet emission wavelength. (about 405 nm). The light emitting device 3 is cylindrical in shape and is configured so that the semiconductor laser element 9 is fixed inside an elliptical peripheral wall 17 integrally molded on a circular plate 15. located on a lower internal face. The condenser lens 11 is attached to the approximate center 10 of a cylindrical inner wall surface of the light emitting device 3. In addition, a rectangular or circular fixing hole 19 is formed in the center of the upper surface of the light emitting device 3. The luminophore 13 is connected to the fixing hole 19 and fitted therein by means of a transparent adhesive, for example silicone or low-melting point glass. Since the typical laser light is not generated as a perfect circle, but in elliptical form, the fixing hole may be an elliptical hole. In either case, the fixing hole 19 is shaped so that at least a portion of the laser light generated in the semiconductor laser element 9 is absorbed without being masked and its wavelength is converted, then it is transmitted. The phosphor 13 is for example a complex body of alumina (Al 2 O 3) and a YAG comprising an activator such as cerium (Ce) introduced therein. The phosphor 13 is in the form of a plate or laminate form including a bottom surface and an upper surface, which are arranged substantially in parallel. The thickness of the phosphor 13 may be set at a suitable thickness, depending on the desired chromaticity. The phosphor 13 emits white light which is generated by the color mixing of the light whose wavelength has been converted as described above and the laser light from the semiconductor laser element 9. [0037 The condenser lens 11 condenses the laser light from the semiconductor laser element 9 and causes the condensed light to radiate to the phosphor 13. The condenser lens 11 is attached to an inner wall between the phosphor 13 and the semiconductor laser element 9 in the cylindrical light emitter device 3. [0038] The projection lens 5 is made of a transparent resin, for example an acrylic resin. In the example shown, the projector lens 5 is an aspheric lens having a convex front surface and a flat rear surface. The projection lens 5 is fixed to a support 21 and is disposed on an optical axis extending in the front-rear direction of a vehicle. [0039] A reflector of the state of the art has a dome shape covering the range above the upper face with respect to the side of the light emitting device 3. The dome shaped reflector is formed so that substantially all of the white light generated in the phosphor of the light emitting device is reflected forward, transmitted to the projection lens and radiated towards the front of a vehicle. In this manner, a basic light distribution pattern (e.g., at least a portion of a low beam light distribution pattern) is formed on a virtual vertical screen (positioned at a position about 25 m in front of the front surface of a vehicle) facing the front surface of the vehicle. The reflector 7 of the example shown has the same basic structure as the reflector of the state of the art, but it is different from the reflector of the state of the art in that a training part of scattered light 23 protruding in hemispherical form is integrally molded on the lower surface of the reflector 7. The light, which moves in the following order: semiconductor laser element 9, condenser lens 11 and phosphor 13, and is converted to white light, is radiated to the lower surface of the reflector 7. The laser light from the semiconductor laser element 9 is transmitted through the phosphor 13, so that the laser light is converted into white light and loses of its directivity. As a result, the laser light travels directly upwards and is also weakly refracted and diffused in the form of an inverted cone, so that the laser light reaches the reflector 7. The white light, which moves 30344 9 8 13 directly upwards or almost directly upwards, reaches the hemispherical dispersed light-forming portion 23 and is dispersed in all directions along the inclination of the hemispherical surface of the radiated dispersed light-forming part 23 ( see the lines in solid lines in Figure 1). Although most of the scattered light does not directly reach the projection lens 5, the scattered light is reflected by multiple elements in a lamp chamber and finally, most of the scattered light is radiated forward. of the vehicle. The white light, which moves in a path other than directly upward and almost directly upward, is reflected by a surface of the reflector 7 other than the scattered light-forming portion 23 protruding into shape. hemispherical and is generally radiated towards the front of the vehicle from the projection lens 5. On the other hand, as will also be described in other embodiments described later, the percentage of the scattered light forming portion formed in the lower surface of the reflector relative to the total surface of the reflector is small. Most of the white light, which is normally generated in the phosphor 13, is generally reflected by the lower surface of the reflector other than the scattered light forming portion and is radiated toward the front of the vehicle. Furthermore, in an abnormal situation in which the luminophore 13 is detached from the phosphor fixing hole 19 or the function of the phosphor 13 is damaged, the wavelength of the laser light reaching the phosphor 13 is not converted by the phosphor and substantially all of the laser light reaches the reflector 7 while maintaining a high directivity. In this case, when the scattered light forming part is not formed in the lower surface as in the reflector of the state of the art, the laser light having a high directivity is directly reflected by the lower surface of the reflector and is radiated towards the front of the vehicle. However, in the present embodiment, as described above, the hemispherical scattered light forming portion 23 is integrally molded at the location of the lower surface of the reflector 7 to which moves the laser light. Accordingly, the laser light, the wavelength of which is not converted, in the phosphor 13 during the abnormal situation but which is incident on the dispersed light forming portion 23, is dispersed in all directions (see the lines in solid lines in Figure 1). In this way, the laser light is converted into scattered light in which the directivity is greatly reduced. Accordingly, in the present embodiment, the laser light having a high directivity is not substantially radiated outward of the vehicle, even when an anomaly occurs in the phosphor. However, it is undesirable to leave the phosphor in an abnormal situation. It is desirable, for example, that a vehicle be stopped at a safe location and then the lamp be turned off when an abnormality is detected in a photodetector as described below. [0044] FIGS. 2A to 2C are partially exploded partial longitudinal sectional views showing respectively vehicle lamps according to a second to a fourth embodiment of the present invention. These embodiments have the same configurations as the first embodiment except for a scattered light forming portion formed in the lower surface of a reflector of a lamp unit. In the second embodiment shown in FIG. 2A, a concave groove 25 is formed in the lower surface of the reflector 7 and has a lower surface serving as a reflective surface. In addition, an auxiliary phosphor, which is the same as phosphor 13 or the like, and serves as a scattered light-forming part 23a, is incorporated in the concave groove 25. In the third embodiment shown in FIG. FIG. 2B, a scattered light forming portion 23b, which is formed of serrated irregularities, is integrally molded on the lower surface of the reflector 7. In the fourth embodiment shown in FIG. The diffusion, which serves as a scattered light-forming part 23c and is adapted to generate scattered light by dispersing the laser light, is formed on the lower surface of the reflector 7 by deposition or gluing or the like. In the embodiment shown in FIG. 2A, the laser light whose wavelength is not converted due to the detachment or damage of the original phosphor 13 and reaches the part of 23a (auxiliary phosphor), strikes the auxiliary phosphor 23a and is passed through the auxiliary phosphor. In this way, similarly to the case of the phosphor 13 in the normal situation, the laser light is converted into white light and is reflected by the lower surface of the concave groove 25. Thus, the white light is again transmitted through the Auxiliary phosphor 23a and radiated forward. Accordingly, in the second embodiment as well, it is possible to prevent the laser light having a high directivity from being radiated outwardly of the vehicle even when the phosphor 13 is detached or damaged. In addition, since the auxiliary phosphor 23a for performing wavelength conversion is the same as, or similar to, the original phosphor 13, the same functionality is guaranteed. [0047] Moreover, during normal driving, the laser light strikes the phosphor twice and thus, the wavelength conversion can be performed more reliably. On the other hand, in the wavelength conversion by the original phosphor 13, there is a possibility that the directivity is not sufficiently weakened and thus a slight directivity is maintained. Even in this case, the light in which the directivity is retained strikes the auxiliary phosphor 23a, thereby obtaining the scattered light in which the directivity is entirely suppressed. In the embodiment shown in FIG. 2B, the scattered light forming portion 23b, which is formed of jagged irregularities, is integrally molded on the lower surface of the reflector 7. As a result, the light laser, the wavelength of which is not converted due to the detachment or damage of the original phosphor 13 and reaches the scattered light forming portion 23b (jagged irregular surface), is dispersed in all directions on the surface of the scattered light forming portion 23b, depending on the shape of the irregular surface. In this way, similarly to the first embodiment, the laser light is converted to scattered light in which the directivity is greatly reduced. In order to generate scattered light of various angles, it is desirable that a plurality of surfaces, which are inclined in the same direction in the unevenly toothed surface, are not parallel to each other but have slightly different angles. The dispersed light-forming portion integrally molded on the lower surface of the reflector 7 may include a file-like surface 15 on which a large number of fine grooves are drawn to cut each other, or a cavity hemispherical which is formed over a range of allowable depth as a function of the strength of the reflector 7 or the like, instead of the hemispherical dispersed light-forming portion 23 shown in Fig. 1 or the irregularly toothed surface 23b shown in FIG. In either case, the shape of the scattered light-forming portion is desirable to allow the laser light reaching the reflector to be scattered at various angles as far as possible. For example, a concave groove or a protruding convex portion or the like having a rectangular cross-sectional shape is undesirable because the direction of reflection is limited. In the embodiment shown in FIG. 2C, the scattering agent serving as a scattered light forming part 23c is deposited or glued on the lower surface of the reflector 7. For example, the diffusion agent may be directly formed on the lower surface of the reflector 7 by deposition and drying, on the surface of the reflector, a solvent including fine particles in suspension with light-diffusing ability, such as barium sulfate or by deposition and drying of paint on the surface of the reflector. In addition, a diffusion sheet may be glued to a predetermined location on the bottom surface of the reflector 7. The diffusion sheet is obtained by depositing and drying the paint or a solvent where the fine particles are suspended. and then forming the diffusion agent in a laminated form on a surface of the dried paint or solvent. In addition, a surface 5 of the diffusion sheet may be roughened to form fine irregularities and then the diffusion sheet may be adhered to the lower surface of the reflector 7. [0051] In this embodiment also, when the light Since the laser has a high directivity reaches the scattered light forming portion 23c due to the detachment or damage of the phosphor 13, the scattered light forming portion 23c serves as a scattering agent. In this manner, similarly to the embodiment described above, the laser light is dispersed in all directions and thus is converted to scattered light in which there is little or no directivity. A vehicle lamp 1 according to a fifth embodiment shown in FIGS. 3 and 4 has the same configurations as the vehicle lamp shown in FIG. 1. As a result, the identical or similar parts are represented by numbers identical or similar references and the repetition of their description will be omitted. In the fifth embodiment, a diffraction grating 23d is used as the scattered light forming part. In addition, the laser light, which is diffracted in the diffraction grating 23d, is detected by one or two or more detector elements 27, for example a photodetector. In the fifth embodiment also, in a normal situation, the phosphor 13 operates to convert the wavelength of at least a portion of the laser light. Thus, the high directivity of the high energy laser light is weakened and thus low energy white light is generated. When the white light is reflected by the lower surface of the reflector 7 other than the diffraction grating 23d, substantially all of the white light is radiated forward. The white light reaching the diffraction grating 30344 is reflected in directions corresponding to the inclined angles of the fine grids of the diffraction grating 23d. When the detection element 27 is installed in advance, at one or two or more locations in the vehicle lamp 1, in particular, when a plurality of detection elements 27 is installed, the reflected light is incident. on at least one sensing element 27, as shown in Fig. 3. By measuring the wavelength or intensity of the light, it is possible to confirm that a predetermined amount of white light is normally generated. [0054] However, when the phosphor is detached from a predetermined position or the phosphor is functionally deteriorated, even when it is present in the predetermined position, substantially all of the laser light having a high directivity reaches the diffraction grating 23d, is reflected in directions corresponding to the inclined angles of the fine grids of the diffraction grating 23d, and is then incident on the detection element 27, as with the white light. The light incident on the sensing element 27 has the wavelength of the laser light and a greater amount of light than the white light. Therefore, by measuring the wavelength or the intensity of the light, it is possible to confirm that it is not the white light generated in the normal situation but the laser light generated in the semiconductor laser element which is directly incident on any one of the plurality of sensing elements 27 without its wavelength being converted by the phosphor 13. When such a situation occurs, it is desirable to inform the driver of the anomaly using an alarm or the like. On the other hand, as can be seen from FIG. 4, the area of installation of the diffraction grating 23d is very small relative to the total area of the reflector 7. Most of the white light generated in the normal situation does not reach the diffraction grating 23d, but is reflected by the reflector 7, to radiate forward. In addition, the semiconductor laser element 9 generally has an elliptical shape and the laser light generated in the semiconductor laser element 9 also forms an elliptical light flux. In an abnormal situation in which the phosphor 13 is not present, the laser light reaches the reflector 7 retaining the elliptical shape. Accordingly, it is desirable that the diffraction grating 23d formed in the reflector 7 also has an elliptical shape, as shown in FIG. 4. [0055] FIGS. 5A and 5B are respectively longitudinal sectional side views of FIG. a vehicle lamp according to a sixth embodiment. A light emitting device 3 of the present embodiment has the same configuration as in the vehicle lamp 10 shown in Fig. 1. Accordingly, identical or similar parts are represented by like or similar reference numerals and the repetition of their description will be omitted. Similarly to each of the previous embodiments, in the sixth embodiment, it is suggested that the scattered light forming portion 15 be formed on the reflector to deal with the detachment or damage of the phosphor 13 and to treat a situation. wherein the optical path of the laser light is changed due to oblique or horizontal movement of the light-emitting device 3. Unlike the reflector 7 of the foregoing embodiments, a reflector 7a of the present embodiment is substantially configured by a domed curved portion and has a small width in the up-down direction. However, the same dispersed light forming portion 23 as in the first embodiment is formed on the bottom surface of the reflector 7a. A masking plate 31 having an internally drilled needle hole 29 is provided transversely continuously towards the lower end of the reflector 7a, the reflector 7a and the masking plate 31 are integrally molded from resin or the like. . In this way, even when an external force is applied, the positional relationship between the scattered light forming part 23 of the reflector 7a and the needle hole 29 of the masking plate 31 is set to be invariable. . On the other hand, in a large number of cases, the actual diameter of the needle hole in the lamp unit is set at about 1 mm. Fig. 5A shows a normal state in which the light emitting device 3 is disposed in a normal position. In this state, the needle hole 29 is formed in the masking plate 31, so that its outer edge is located outside of all the straight lines connecting the outer peripheral surface of the dispersed light forming portion. 23 and the center of the condenser lens to the expected position of maximum movement of the condenser lens 11 after obliquely or horizontally moving the light emitting device 3 shown in Figure 5B. In the normal state shown in Fig. 5A, similarly to the case of the previous embodiments, the laser light generated in the semiconductor laser element 9 is transmitted through the condenser lens 11, and then reaches the phosphor 13. The wavelength of the laser light is then converted to generate white light. Substantially all of the white light reaches the scattered light forming portion 23 through the needle hole 29 formed in the masking plate 31 and is dispersed in all directions. The scattered light is reflected by multiple elements in a lamp chamber and finally, most of the scattered light is radiated towards the front of the vehicle. In the state shown in FIG. 5A, even when abnormal situations such as the detachment of the phosphor 13 from the phosphor fixing hole 19 or the functional damage of the phosphor 13 occur, substantially all of the light laser passes through the needle hole 29 and reaches the scattered light forming portion 23 of the reflector 7a without its wavelength being converted by the phosphor 13 and maintaining a high directivity. The laser light is then dispersed in the scattered light forming portion 23 and thus its strong directivity is weakened. In this way, the laser light becomes scattered light of low energy and in the same way as in the normal situation, is radiated towards the front of the vehicle. Thus, in the example shown in FIG. 5A, and the preceding embodiments, even when the laser light, the wave length of which is not converted because of the detachment or the damage to the phosphor 13, reaches the reflector, the laser light is dispersed by the scattered light forming portion and is converted into low energy dispersed light. As a result, high energy laser light having a high directivity is prevented from being radiated to the outside of the vehicle. [0060] However, for example, in the first embodiment shown in FIG. 1, when the phosphor 13 is detached and the light emitting device 3 is inclined or displaced horizontally, the position of the semiconductor laser element 9 or the condenser lens 11 is moved. Thus, the optical axis of the laser light is changed and the laser light transmitted through the condenser lens 11 reaches the reflector 7 without its wavelength being converted by the phosphor 13. Accordingly, there is a possibility that so that a portion of the laser light strikes the lower surface of the reflector 7 other than the scattered light forming portion 23 and thus the high energy light having a high directivity is reflected towards the front of the vehicle. [0061] However, in the sixth embodiment shown in FIG. 5B, as described above, the needle hole 29 is formed such that the straight line connecting the center of the condenser lens to the position expected maximum movement of the condensing lens 11 and the outer edge of the scattered light forming portion 23 passes through the interior of the needle hole 29. As a result, even when situations occur only with a very low probability, such that the detachment or damage of the phosphor 13 and the inclination or horizontal movement of the light-emitting device 3 occur at the same time, in the sixth embodiment, from the laser light from the lens condenser 11 displaced, the light directed towards the lower surface of the reflector 7 other than the scattered light forming part 23 is masked by the plate of As a result, the high energy laser light can reliably be prevented from radiating outwardly from the needle hole 29 and thus can not reach the reflector 7. As a result, the high energy laser light can be reliably prevented from being radiated outwardly of the vehicle.
    权利要求:
    Claims (7)
    [0001]
    REVENDICATIONS1. A vehicle lamp (1) comprising: a semiconductor laser element (9) configured to emit laser light; a condenser lens (11) configured to condense the laser light; a phosphor (13) configured to form white light by converting the wavelength of at least a portion of the condensed laser light; and a reflector (7) configured to reflect white light, wherein a scattered light forming portion (23) is formed on a surface of the reflector (7), which is a surface on which a path obtained by extending the optical path laser light before the laser light strikes the phosphor (13) intersects the reflector (7).
    [0002]
    The vehicle lamp (1) according to claim 1, wherein the dispersed light forming portion (23) is an auxiliary phosphor (13) disposed on the surface of the reflector (7).
    [0003]
    The vehicle lamp (1) according to claim 1, wherein the scattered light forming portion (23) is a curved surface or an irregular surface which is formed on the surface of the reflector (7).
    [0004]
    The vehicle lamp (1) according to claim 1, wherein the dispersed light forming portion (23) is a diffusion agent disposed on the surface of the reflector (7).
    [0005]
    A vehicle lamp (1) comprising: a semiconductor laser element (9) configured to emit laser light; a condenser lens (11) configured to condense the laser light; a phosphor (13) configured to form white light by converting the wavelength of at least a portion of the condensed laser light; and a reflector (7) configured to reflect white light, wherein a diffraction grating is provided on a surface of the reflector (7), which is a surface on which a path obtained by extending the optical path of the laser light before the laser light strikes the phosphor (13) intersects the reflector (7).
    [0006]
    The vehicle lamp (1) according to claim 5, further comprising: at least one light detector, wherein, from the light radiated to the diffraction grating, the light of a range of lengths of Specific wave is diffracted and guided towards the one or both light detectors or more.
    [0007]
    The vehicle lamp (1) according to any one of claims 1 to 6, further comprising: a flap provided between the phosphor (13) and the scattered light forming portion (23) or the diffraction grating, the flap having a needle hole, the needle hole being formed such that a straight line connecting the maximum expected movement position of the condensing lens and the outer edge of the scattered light forming portion ( 23) or the diffraction grating passes through the interior of the needle hole.
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    同族专利:
    公开号 | 公开日
    CN106051573A|2016-10-26|
    DE102016205515A1|2016-10-06|
    JP2016197523A|2016-11-24|
    FR3034498B1|2019-05-03|
    US9970619B2|2018-05-15|
    CN106051573B|2018-10-12|
    US20160290584A1|2016-10-06|
    JP6504886B2|2019-04-24|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JP5122542B2|2009-09-15|2013-01-16|シャープ株式会社|Light emitting device, lighting device, and light detector|
    JP4975797B2|2009-10-14|2012-07-11|シャープ株式会社|LIGHTING DEVICE, VEHICLE LIGHT, AND VEHICLE|
    JP5657357B2|2010-12-01|2015-01-21|スタンレー電気株式会社|Vehicle lighting|
    JP5261543B2|2011-06-30|2013-08-14|シャープ株式会社|Laser beam utilization apparatus and vehicle headlamp|
    JP5888015B2|2012-03-09|2016-03-16|スタンレー電気株式会社|Vehicle lamp and vehicle|
    JP6039947B2|2012-07-13|2016-12-07|株式会社小糸製作所|Vehicle lighting|
    CN103883955A|2012-12-22|2014-06-25|鸿富锦精密工业（深圳）有限公司|LED automobile lamp|
    JP6164518B2|2013-03-18|2017-07-19|スタンレー電気株式会社|Vehicle headlamp|
    DE102013223947A1|2013-11-22|2015-05-28|Osram Gmbh|lighting device|
    DE102014215221A1|2014-08-01|2016-02-04|Osram Gmbh|Lighting device with phosphor body spaced from a light source|
    FR3029265B1|2014-11-27|2017-01-13|Valeo Vision|LIGHTING SYSTEM FOR A MOTOR VEHICLE WITH STATIC MEANS FOR SCANNING LIGHT BEAM|
    JP6515525B2|2014-12-22|2019-05-22|スタンレー電気株式会社|Lamp|
    DE102015222296A1|2015-11-12|2017-05-18|Robert Bosch Gmbh|Projection system for a projector and / or a vehicle light|US9800017B1|2009-05-29|2017-10-24|Soraa Laser Diode, Inc.|Laser device and method for a vehicle|
    JP6509617B2|2015-04-15|2019-05-08|株式会社小糸製作所|Vehicle lamp|
    US10938182B2|2015-08-19|2021-03-02|Soraa Laser Diode, Inc.|Specialized integrated light source using a laser diode|
    US10879673B2|2015-08-19|2020-12-29|Soraa Laser Diode, Inc.|Integrated white light source using a laser diode and a phosphor in a surface mount device package|
    AT518010B1|2015-10-23|2017-10-15|Zkw Group Gmbh|Monitoring device for monitoring the operating state of a laser vehicle headlight and vehicle headlights|
    KR101795229B1|2016-03-31|2017-11-08|현대자동차주식회사|Lamp apparatus for a vehicle|
    FR3051534B1|2016-05-04|2020-10-02|Valeo Vision|LIGHT MODULE CONTAINING A LASER ELEMENT|
    DE102016207759A1|2016-05-04|2017-11-09|Osram Gmbh|Detecting damage to a converter device|
    KR20180063541A|2016-12-02|2018-06-12|엘지전자 주식회사|poly crystal phosphor film and method for fabricating the same and vehicle lamp apparatus for using the same|
    JP6761600B2|2017-01-05|2020-09-30|大日本印刷株式会社|Lighting device|
    IT201700002416A1|2017-01-11|2018-07-11|Autoscan Gmbh|AUTOMATED MOBILE EQUIPMENT FOR DETECTION AND CLASSIFICATION OF BODY DAMAGE|
    EP3358249A1|2017-02-02|2018-08-08|Valeo Iluminacion|Lighting module for an automotive headlamp|
    DE102017103402A1|2017-02-20|2018-08-23|Automotive Lighting Reutlingen Gmbh|Lighting device for installation in a motor vehicle|
    US10317032B2|2017-03-10|2019-06-11|Texas Instruments Incorporated|Headlamp with digital micromirror device and static reflector|
    KR20180128538A|2017-05-23|2018-12-04|현대자동차주식회사|Lamp apparatus for vehicle|
    JP6862291B2|2017-06-16|2021-04-21|株式会社小糸製作所|Vehicle lighting|
    US10288249B2|2017-07-26|2019-05-14|Ford Global Technologies, Llc|Pattern styling for reducing glare in vehicle lighting assemblies|
    JP2019096381A|2017-11-17|2019-06-20|株式会社小糸製作所|Vehicular lighting fixture|
    EP3553370B1|2018-04-09|2021-08-04|Toyota Jidosha Kabushiki Kaisha|Vehicle lamp|
    JP2021114356A|2018-04-18|2021-08-05|シャープ株式会社|Light source device having wavelength conversion element|
    WO2019223859A1|2018-05-23|2019-11-28|HELLA GmbH & Co. KGaA|Multi lens array, luminous source and vehicle|
    DE102018124743A1|2018-10-08|2020-04-09|Automotive Lighting Reutlingen Gmbh|Lighting device for a motor vehicle and motor vehicle with such a lighting device|
    CN111197725A|2018-11-20|2020-05-26|深圳市绎立锐光科技开发有限公司|Lighting device and lamp|
    US11239637B2|2018-12-21|2022-02-01|Kyocera Sld Laser, Inc.|Fiber delivered laser induced white light system|
    JP2021005495A|2019-06-26|2021-01-14|株式会社小糸製作所|Vehicular lighting fixture|
    法律状态:
    2017-02-27| PLFP| Fee payment|Year of fee payment: 2 |
    2018-02-28| PLFP| Fee payment|Year of fee payment: 3 |
    2018-09-14| PLSC| Search report ready|Effective date: 20180914 |
    2019-02-27| PLFP| Fee payment|Year of fee payment: 4 |
    2021-01-08| ST| Notification of lapse|Effective date: 20201205 |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2015076445A|JP6504886B2|2015-04-03|2015-04-03|Vehicle lamp|
    JP2015-076445|2015-04-03|
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