• 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:
    The present invention relates to a projection lens system of at least one light source (1) comprising, from said source (1) and in the direction of propagation of light, at least a first group of optical elements (2). consisting of at least a first so-called primary convergent lens (3), in contact with said light source (1), obtained in a material having a strong constringence and having a ratio between its thickness along the optical axis and its width greater than 0.5, a second group of optical elements (6) consisting of at least one diverging lens (7) obtained in a material having a low constringence, a pupil (8) and a third group of optical elements (9) consisting of a reflector or at least one convergent lens (10) obtained in a material having a strong constringence.
    公开号:FR3047794A1
    申请号:FR1651225
    申请日:2016-02-16
    公开日:2017-08-18
    发明作者:Marine Courcier；Jerome Lecorre
    申请人:Valeo Vision SA；
    IPC主号:
    专利说明:

    "Projection lens system of at least one light source"
    The present invention relates to a system of projection lenses of at least one light source, such as a laser scan or LED said LED, said immersed in a first so-called primary lens. The invention will find many applications in the field of lighting and more particularly in the field of lighting systems and / or signaling for a motor vehicle
    In the field of lighting, and particularly in the automotive field, different types of bulbs have been used as a light source, but recently, light-emitting diodes (LEDs) are becoming more widely used. Indeed, light-emitting diodes (LEDs) have an excellent efficiency of converting electricity into light, emit a small amount of heat, have a reduced size and weight and have a long life.
    Given these advantages, many lighting systems have been designed using LED arrays positioned at the right of a lens, usually an aspherical lens that corrects aberrations. Furthermore, it is customary to calculate the shape of the surfaces of the diopters of the lighting systems in order, on the one hand, to limit the aberrations induced by said diopters that the light passes through and, on the other hand, to obtain the beam desired light output. Although it is possible to obtain good imaging for an LED located on the optical axis of the lighting system, the lighting systems include a large number of LEDs, and therefore LEDs distant from the optical axis , which cause annoying field aberrations. The invention proposes to improve the situation and concerns for this purpose a system of projection lenses of at least one light source comprising, from said source and in the light propagation direction, at least a first group of optical elements consisting of at least a first so-called primary hemispherical convergent lens, in contact with said light source, obtained in a material having a strong constringence and having a ratio between its thickness along the optical axis and its width greater than 0 , 5, a second group of optical elements consisting of at least one diverging lens obtained in a material having a weak constringence, a pupil and a third group of optical elements consisting of at least one convergent reflector or at least one a convergent lens obtained in a material having a strong constringence. The hemispherical primary optics capture a maximum of light from the light source and the lenses of the three optical systems, successively convergent, divergent and convergent, allow to correct the aberrations and to shape the light beam.
    In order that the light captured by the primary optics is as large as possible, the first hemispherical primary convergent lens has a gap to a sphere less than 10% of the thickness and, preferably, a gap to a sphere of less than 3% thickness.
    Preferably, the first group of optical elements comprises a second lens comprising at least one aspheric face, the aspherical face of the second lens of the first group of optical elements extending on the opposite side to the primary lens.
    On the other hand, the diverging lens of the second group of optical elements preferably consists of a biconcave lens.
    Alternatively, the diverging lens of the second group of optical elements consists of a plano-concave lens.
    Preferably, the converging lens of the third group of optical elements comprises at least one aspherical face, the aspherical face of the converging lens of the third group of optical elements extending on the opposite side to the pupil positioned between the second group of optical elements. optical elements and the third group of optical elements.
    Preferably, the light source consists of at least one LED source or a laser.
    According to one aspect of the invention, the light source consists of a wavelength conversion device in contact with the primary convergent lens and receiving radiation from a primary source consisting of a plurality of LED sources.
    Preferably, the wavelength conversion device consists of a substrate comprising at least two materials respectively forming an interference filter and distributed in at least two different zones. The invention will be better understood in the light of the following description which is given only as an indication and which is not intended to limit it, accompanied by the appended drawings among which:
    Figure 1 is a schematic representation of the projection lens system of at least one light source according to the invention;
    FIG. 2 is a representation of an alternative embodiment of the projection lens system according to the invention, said variant embodiment comprising a wavelength conversion device.
    In the figures, identical or similar elements bear the same references.
    As illustrated in FIG. 1, the invention relates to a projection lens system of at least one light source 1. Said lens system comprises, from said light source 1 and in the direction of propagation of the light, a first group of optical elements 2 consisting of a first so-called primary convergent lens 3 of hemispherical shape, in contact with said light source 1, obtained in a material having a strong constringence and having a ratio between its thickness along the optical axis and its height greater than 0.5, and a second lens 4 comprising an aspherical face 5, the aspheric diopter 5 of the second lens 4 of the first group of optical elements 2 corresponding to the input diopter of the lens, ie extending on the side of the primary lens 4, a second group of optical elements 6 consisting of a diverging lens 7 obtained in a material having a weak constringence, a pupi 8 and a third group of optical elements 9 consists of a convergent lens 10 obtained in a material having a strong constringence. In the remainder of the description, "strong constringence" means a constringence greater than 40 and a "weak constringence" a constringence of less than 40.
    It will be observed that the light source 1 may consist in any primary light source or in any secondary light source such as an exit zone, or a decoupling zone, light guides, an exit zone, or a decoupling area, a matrix convergent diopters, or a virtual image (in matter) generated by a matrix of convergent diopters without departing from the scope of the invention.
    For example, the primary lens 3 of the first group of optical elements 2 and the convergent lens 10 of the third group of optical elements 9 may be obtained in optical glass marketed under the reference N-LAK33A by the company SCHOTT and whose constringence is equal to 52, in polymethyl methacrylate commonly designated by PMMA according to the acronym "PolyMethyl MethAcrylate" and whose constringence is equal to 58 or in any other transparent thermoplastic polymer having the same constringence. The diverging lens 6 of the second group of optical elements 6 can be obtained in any material having a constringence of less than 40 such as polycarbonate (PC) whose constringence is 30 or N-SF2 glass whose constraint is 339 per example.
    The primary lens 3 of hemispherical shape makes it possible to extract a maximum of light coming from the light source 1 and the lenses 3, 4, 7 and 10 of the three optical systems 2, 6 and 9, successively convergent, divergent and convergent, make it possible to correct the aberrations and shape the light beam. It will be noted that constringence is understood to mean the index representative of the chromatic dispersion of the lenses. Thus, the constringence is equivalent to the Abbe number and the dispersion coefficient and corresponds to the variation of the refractive index of the material as a function of the wavelength of the light. The higher the constringence, the less the lens presents chromatic dispersion.
    In order to jointly obtain the best light extraction and the best correction of the optical aberrations, the first hemispherical primary convergent lens 3 has a gap to a sphere less than 10% of the thickness of the lens and, preferably, a gap to a sphere less than 3% of the thickness.
    Moreover, the diverging lens 6 of the second group of optical elements consists of a biconcave lens in which the input diopter of the lens has a radius of curvature greater than the radius of curvature of the output diopter. In addition, the convergent lens 10 of the third group of optical elements comprises an aspheric diopter 11, said aspheric diopter 11 of the convergent lens 10 of the third group of optical elements 9 extending on the opposite side to the pupil 8 positioned between the second group of optical elements 6 and the third group of optical elements 9, ie corresponding to the output diopter of said convergent lens 10. It will also be noted that the optical axes of the lenses 3, 4, 6 and 10 are coaxial.
    In this embodiment, the light source 1 consists of light-emitting diodes, called LEDs, whose phosphor is said to be immersed in the primary lens 3. The term "immersed" means that the phosphor of the LEDs is in contact with the lens In this way, the light emitted by the phosphorus leaves directly "immersed in the primary optics. However, it is obvious that the light source may consist of any light source well known to those skilled in the art without departing from the scope of the invention.
    According to a first variant embodiment, not shown in the figures, the first group of optical elements 2 may have only one hemispherical primary convergent lens 3.
    According to another variant embodiment, not shown in the figures, the convergent lens 10 of the third group of optical elements 9 may be substituted by one or more convergent reflectors (s).
    Moreover, it goes without saying that each of the lenses 3, 5, 7 and 10 may be substituted by at least two lenses without departing from the scope of the invention.
    According to another alternative embodiment with reference to FIG. 2, said lens system comprises in the same manner as before, from said light source 1 and in the direction of light propagation, a first group of optical elements 2 constituted by a first hemispherical shaped primary convergent lens 3, in contact with said light source 1, obtained in a material having a strong constringence and having a ratio between its thickness along the optical axis and its width greater than 0.5, and a second lens 4 comprising an aspherical face 5, the aspheric diopter 5 of the second lens 4 of the first group of optical elements 2 corresponding to the input diopter of the lens, ie extending from the side of the primary lens 4, a second group of optical elements 6 consisting of a diverging lens 7 obtained in a material having a weak constringence, a pupil 8 and a third me group of optical elements 9 consisting of a convergent lens 10 resulting in a material having a high constringence.
    Said lens system differs from that previously described in that it comprises a wavelength conversion device 12 in contact with the primary convergent lens 3 and receiving the radiation of a primary light source 1 consisting of a plurality light emitting diodes called LEDs. Thus, the length conversion device behaves as a submerged secondary light source, i.e. in contact with the primary convergent lens 3.
    It will be observed that the plurality of light-emitting diodes may be substituted by a single LED consisting of individually addressable zones or by an image-forming zone by scanning a laser beam, said zone comprising a diffusing and / or reflecting surface, without however, outside the scope of the invention.
    Thus, the lighting system according to the invention is able to project in the form of a light beam an image of the light source placed at the focus of the optical system, that is to say in contact with the primary hemispherical lens 3. More particularly, said light source 1 may be an array of LEDs, that is to say a light surface divided into zones, such as squares commonly called "pixels" for example, which can be turned on or off independently of each other. others in order to achieve an so-called adaptive lighting system. Such an adaptive lighting system of a vehicle makes it possible to adapt the distribution of the light of the beam to the traffic conditions. For example, when all the pixels are on, the system projects a powerful beam of light on the road, commonly known as the driving beam, which is dazzling to other drivers, and when a vehicle is detected in front of the lighting system, the or the pixels whose light dazzles the other conductor are extinguished in the beam to form a less powerful beam commonly referred to as a passing beam.
    It is understood that the present invention is in no way limited to the embodiments described above and that many modifications can be made without departing from the scope of the appended claims.
    权利要求:
    Claims (10)
    [1" id="c-fr-0001]
    "CLAIMS"
    A projection lens system of at least one light source (1) comprising, from said source (1) and in the direction of propagation of light, at least a first group of optical elements (2) consisting of at least one first so-called primary convergent lens (3), in contact with said light source (1), obtained in a material having a strong constringence and having a ratio between its thickness along the optical axis and its width greater than 0.5 a second group of optical elements (6) consisting of at least one diverging lens (7) obtained in a material having a low constringence, a pupil (8) and a third group of optical elements (9) consisting of at least one convergent reflector or at least one convergent lens (10) obtained in a material having a strong constringence.
    [2" id="c-fr-0002]
    The lens system of claim 1 wherein the first primary convergent lens is hemispherical in shape (3) and has a gap to a sphere less than 10% of the thickness and, preferably, a gap to a sphere less than 3% of the thickness.
    [3" id="c-fr-0003]
    3. A lens system according to any one of claims 1 or 2 wherein the first group of optical elements (2) comprises a second lens (4) comprising at least one aspheric diopter (5).
    [4" id="c-fr-0004]
    4. The lens system according to claim 3 wherein the aspheric diopter (5) of the second lens (4) of the first group of optical elements (2) extends on the side of the primary lens (3).
    [5" id="c-fr-0005]
    The lens system of any one of claims 1 to 4 wherein the diverging lens (7) of the second group of optical elements (6) is a biconcave lens.
    [6" id="c-fr-0006]
    The lens system of any one of claims 1 to 4 wherein the diverging lens of the second group of optical elements is a plano-concave lens.
    [7" id="c-fr-0007]
    7. A lens system according to any one of claims 1 to 6 wherein the convergent lens (10) of the group of optical elements (9) comprises at least one aspheric diopter (11).
    [8" id="c-fr-0008]
    The lens system of claim 7 wherein the aspheric diopter (11) of the converging lens (10) of the third group of optical elements (9) extends on the opposite side to the pupil (8) positioned between the second group of optical elements (6) and the third group of optical elements (9).
    [9" id="c-fr-0009]
    9. The lens system according to any one of claims 1 to 8 wherein the light source (1) consists of at least one LED source or a laser.
    [10" id="c-fr-0010]
    The lens system according to any one of claims 1 to 8 wherein the light source consists of a wavelength converting device (12) in contact with the primary convergent lens (3) and receiving the radiation of a primary source (1) consisting of a plurality of LED sources.
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    同族专利:
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    CN107085282A|2017-08-22|
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    CN107085282B|2021-07-06|
    KR20170096597A|2017-08-24|
    US20170234497A1|2017-08-17|
    JP2017146600A|2017-08-24|
    FR3047794B1|2018-03-09|
    EP3208645A1|2017-08-23|
    引用文献:
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    法律状态:
    2017-02-28| PLFP| Fee payment|Year of fee payment: 2 |
    2017-08-18| PLSC| Publication of the preliminary search report|Effective date: 20170818 |
    2018-02-26| PLFP| Fee payment|Year of fee payment: 3 |
    2020-02-28| PLFP| Fee payment|Year of fee payment: 5 |
    2021-02-26| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1651225|2016-02-16|
    FR1651225A|FR3047794B1|2016-02-16|2016-02-16|SYSTEM FOR PROJECTION LENSES OF AT LEAST ONE LIGHT SOURCE|FR1651225A| FR3047794B1|2016-02-16|2016-02-16|SYSTEM FOR PROJECTION LENSES OF AT LEAST ONE LIGHT SOURCE|
    EP17155295.3A| EP3208645B1|2016-02-16|2017-02-08|System of lenses for projecting at least one light source|
    CN201710079884.8A| CN107085282B|2016-02-16|2017-02-14|Lens system for projecting at least one light source|
    KR1020170020469A| KR20170096597A|2016-02-16|2017-02-15|System of lenses for projecting at least one light source|
    US15/433,284| US10670210B2|2016-02-16|2017-02-15|System of lenses for projecting at least one light source|
    JP2017026236A| JP7036539B2|2016-02-16|2017-02-15|Lens system for projecting at least one light source|
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