• 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 device for uniformly illuminating an eye, comprising: - a light source (3); - a first light guide (1) which is optically connected to said light source and comprises a plurality of reflective facets (4) stamped in the light guide; - a second light guide (2) which is optically connected to the first light guide (1) and comprises a plurality of reflective facets (6) stamped in the second light guide; - Means for immobilizing the device on the head of a user.
    公开号:BE1021458B1
    申请号:E2012/0074
    申请日:2012-02-07
    公开日:2015-11-26
    发明作者:Serge Habraken；Stéphane Krsmanovic
    申请人:Patrimoine De L'universite De Liege；Psychomed.Com；
    IPC主号:
    专利说明:

    FIELD OF THE INVENTION [0001] The present invention relates to a photostimulation device for stimulating brain activity.
    STATE OF THE ART [0002] It is known in the art that the cerebral rhythm is influenced by the rhythm of repetitive sensory stimuli. For example, when exposed to a constant rhythm of light entering the eyes, the cerebral rhythm follows the received frequency which induces a state of deeper cerebral activity.
    [0003] It is known that the combined effect of a synchronous sound and light rhythm that stimulates the ears and the eyes is particularly effective for such stimulation.
    [0004] Depending on the intensity of the light and the modulation frequency, this stimulation has been used to reach meditative and / or hypnotic states. It is also known to induce relaxation or excitement, or to improve learning ability.
    In order to be able to induce these states wherever it is necessary, portable devices for inducing such stimulation have been developed. For example, the document WO 2008/131454 describes wearing glasses comprising LEDs placed in front of each eye, the light emitted by said LEDs being modulated by an electronic microcontroller. The disclosed device also incorporates headphones and sound adjustment devices. Using a single LED source in front of the eye does not produce uniform illumination on the retina, but only a small portion of the surface of the retina is illuminated. Indeed, the lateral extension of the source does not cover the field of vision of an eye: only the central (axial) zone is illuminated. Perception is an intense light, blinding the user.
    Therefore, in order to improve the angular distribution of the incoming light, it has been proposed to use indirect lighting, whereby the light source illuminates a diffuse reflector placed in front of the eyes, as the discloses US 5,599,274. The disadvantage of such a system is that only a small portion of the incoming light is reflected back to the eyes (less than about 10%). Therefore, the power consumption of these LEDs to achieve a useful effect is so high that a separate battery must be used to achieve sufficient autonomy.
    [0007] WO 2005/094941 discloses a system comprising optical deflection means for illuminating the eyes, the deflection means being either refractive Fresnel lenses or diffraction means. Nevertheless, to obtain a sufficiently distributed lighting, several LEDs are used for each eye, which makes the system bulky. In addition, the LEDs are placed in the upper face and in front of the plane of the lens (that is to say outside the plane), which further increases the size of the device.
    OBJECTIVES OF THE INVENTION [0008] The present invention aims to provide a compact device for photostimulation of the eyes, with minimal power consumption for a certain illumination of the eyes and providing sufficiently homogeneous illumination. SUMMARY OF THE INVENTION [0009] The present invention relates to a device for providing uniform illumination of an eye, preferably for photostimulation purposes, comprising: - a light source; a first light guide which is optically connected to said light source and comprises a plurality of reflecting facets stamped into the light guide, the number, angular orientations and dimensions of these facets being arranged to extract light having a uniform distribution in a direction substantially perpendicular to the first light guide; a second light guide which is optically connected to the first light guide and comprises a plurality of reflecting facets stamped in the second light guide, the number, angular orientations and dimensions of these facets being arranged to produce, in during use, a uniform distribution of light in a direction directed towards the eye; - Means for immobilizing the device on the head of a user.
    According to particular preferred embodiments, the device according to the invention further comprises one or a suitable combination of at least two of the following characteristics: the light source comprises a light-emitting diode (LED), preferably a light-emitting diode (LED), LED RGB; the outer surface of the face of the light guides comprising the reflecting facets is covered with at least one layer of metal; the stamped reflective facets have a triangular cross-section and extend horizontally from one side to the other side of the light guides; the first and second light guides are separated by an air layer having a thickness of between 0.1 and 0.8 mm, in order to confine the light which is not reflected by the reflecting facets in the light guide ; the number of reflecting facets of the light guides is greater than 10; - The light guides have a concavity which, in use, is oriented towards the eye and focuses the light towards said eye; - The means for immobilizing the device on the user's head are arranged to maintain, in use, a distance between the eye and the second light guide of less than 2.5 cm; the means for immobilizing the device on the user's head has a shape of a pair of glasses, the second light guide replacing at least one of the spectacle lenses; the device further comprises batteries and an adjustment unit comprising a data storage; - The device further comprises a sound adjustment device and headphones or other means of sound diffusion; the device further comprises communication means.
    BRIEF DESCRIPTION OF THE DRAWINGS [0011] FIG. 1 represents a schematic front view of the operating principle of the device according to the invention.
    [0012] Figure 2 shows a schematic side view of the operating principle of the device according 1'invention.
    Figure 3 shows a side view (a) and a top view (b) of an example of a first light guide of a device according to the invention.
    FIG. 4 represents a perspective view of an example of a first light guide of a device according to the invention, corresponding to FIG. 3.
    Figure 5 shows a front view (a), a top view (b) and a side view (c) of an example of a second light guide according to the invention. FIG. 6 represents a perspective view of an example of a second light guide according to the invention, corresponding to FIG. 5.
    Figure 7 shows an example of an eyeglass model according to the invention. Key 1: first light guide 2: second light guide 3: light source 4: reflecting facet of the first light guide 5: light beam 6: reflecting facet of the second light guide 7: pupil 8: eye 9: device glasses type 10: adjustment unit 11: metallised side
    DETAILED DESCRIPTION OF THE INVENTION [0018] The present invention relates to a device for illuminating an eye in a homogeneous manner, for example for photostimulation purposes. In the present invention, "homogenous illumination" means that illumination of the resulting retina is distributed substantially homogeneously over a large area of the retina.
    In the present description, terms such as "above", "below", "in front", "behind", "vertical" and "horizontal" must be understood in relation to the eye of the eye. user, in a standing position.
    To produce such a homogeneous illumination, a first light guide is used, the first light guide comprising reflecting facets for extracting light from the light guide and in a homogeneous manner, the light produced by a light source located at a light source. side of the light guide. The facet geometry is optimized to obtain high directivity of the extracted light (see Fig. 1) in a downward vertical direction.
    The light extracted from the first light guide is injected into a second light guide having the general shape of a spectacle lens. Said second light guide also includes reflecting facets that reflect towards the eye the vertical light extracted from the first light guide.
    The device obtained is then attached to means for immobilizing the light guides in front of the eye of the user. Advantageously, the fastening means have the general shape of a pair of glasses, as shown in Figure 7. Usually, the device comprises two pairs of light guides to illuminate the two eyes simultaneously.
    An advantage of using the first light guide of the invention to illuminate the second light guide is the improvement of the directivity of the light in comparison with distributed light sources.
    For example, the geometry of the various light guides and reflective facets can be determined by a ray tracing simulation algorithm. Such an algorithm calculates the division, reflection and refraction of the light rays through the light guide. Millions of rays are generated and propagated through the optical device to check the distribution of light in the eyes. There is on the market ray tracing software, such as ASAP (Advance Software for Analysis Program) marketed by BRO.
    To maintain the confinement of the light to the first light guide, a layer of a transparent material with a low refractive index is advantageously inserted between the first and second light guides to ensure total internal reflection. Such a layer is advantageously a thin layer of air, preferably having a thickness of between 0.1 and 0.8 mm.
    [0026] Preferably, the second light guide extends in a vertical curved plane (cylindrical paraboloid) having a concavity in the direction of the eye to focus the light on the pupil and the iris mainly (see FIG. 6). In this case, the first light guide follows the same shape to ensure the optical connection (see Fig. 3 and 4).
    At least the surface of the facets is metallized to ensure the reflection of light on the facets. The set of outer faces of the light guides is preferably metallized to isolate the user in a sensory manner.
    Alternatively, the material of the light guides may be chosen such that a total internal reflection occurs. In this case, the user can still see the external environment. This may be advantageous in the case of phototherapy, where constant illumination of the eyes is used, for example for the treatment of seasonal depression or circadian rhythm disorder. Examples of materials having refractive indices sufficient to provide such reflection are PMMA, polycarbonate, and conventional glass (i.e., materials having critical angles smaller than the reflection angles).
    Preferably, the second light guide is located near the eye, so that no accommodation of the vision occurs on the facets, thus reducing the discrete perception of the lighting. Advantageously, the distance between the eye of the user and the second light guide is not more than 2.5 cm, and is preferably between 1 cm and 2 cm.
    The number of reflective facets is advantageously selected to reduce the discrete perception of lighting. For example, the defocused position of the second light guide makes it possible to reduce the effective resolution of the eye, so that the different light points induced by the facets fuse on the retina of the user if the various facets are sufficiently numerous. This phenomenon already appears when about 10 facets per light guide are used, but improves with the number of facets. In addition, the complexity of the form increases with the increasing number of facets. Above about 40 facets, improvements are hardly noticeable. A good compromise between homogeneity and ease of production is a number of about 20 (+/- 5) reflecting facets per light guide.
    Advantageously, the facets are angularly distributed and homogeneous and converge towards the pupil of the eye so as to produce a homogeneous illumination of the retina.
    To reduce the loss of intensity due to light scattering through interfaces, the average roughness of the reflecting surface (Ra) is preferably less than 15 nm.
    [0033] Preferably, the light guides of the invention are made of polymer glass, such as PMMA or polycarbonate, and are produced by injection molding.
    The portability of the device of the invention can be advantageously improved by the integration of batteries and a control unit in the glasses. The adjustment unit is used to adjust the intensity of the light source.
    Advantageously, the adjustment unit is used to modulate the intensity of the light, according to predetermined frequency patterns, stored in a memory. The memory may be an internal memory or an external memory, such as a flash memory card.
    Preferably, the device of the invention further comprises means for adjusting the sound, such as an mp3 player (or the like), so that the modulation of the light and the sound can be synchronized (correlated) by the unit of adjustment to induce a synergistic effect on the brain.
    As a further improvement, the adjustment unit may also include earphones.
    Advantageously, the device of the invention also comprises a communication unit, such as a Bluetooth connection, an internal memory and connection means for reading external memory cards, such as a micro-SD card.
    权利要求:
    Claims (15)
    [1]
    A device for illuminating an eye in a homogeneous manner (8), comprising: - a light source (3); a first light guide (1) which is optically connected to said light source, comprising a plurality of reflecting facets (4) embossed in the light guide, the number, angular orientations and dimensions of these facets being arranged to extract light having a uniform distribution in a direction substantially perpendicular to the first light guide; a second light guide (2) which is optically connected to the first light guide (1) and which comprises a plurality of reflecting facets (6) embossed in the second light guide, the number, the angular orientations and the dimensions of these facets being arranged to produce, in use, a uniform distribution of light in a direction directed towards the eye (8); - Means for immobilizing the device on the head of a user.
    [2]
    2. Device according to claim 1, characterized in that the light source (3) comprises a light emitting diode (LED).
    [3]
    3. Device according to claim 2, characterized in that the LED is an RGB LED.
    [4]
    4. Device according to any one of the preceding claims, characterized in that the outer surface (11) of the face of the light guides comprising the reflective facets is covered with at least one layer of metal.
    [5]
    5. Device according to any one of the preceding claims, characterized in that the reflective facets (4,6) etched have a triangular cross section.
    [6]
    6. Device according to any one of the preceding claims, characterized in that the reflective facets extend horizontally from one side to the other of the light guides (1, 2).
    [7]
    7. Device according to any one of the preceding claims, characterized in that the first (1) and second (2) light guides are separated by an air layer having a thickness of between 0.1 and 0.8 mm. , in order to confine in the light guide the light that is not reflected by the reflective facets.
    [8]
    8. Device according to any one of the preceding claims, characterized in that the number of reflective facets (4,6) of the light guides is greater than 10.
    [9]
    9. Device according to any one of the preceding claims, characterized in that the light guides (1,2) have an arranged concavity which, in use, is oriented towards the eye (8) and which focuses the light on said eye (8).
    [10]
    10. Device according to any one of the preceding claims, characterized in that the means for immobilizing the device on the head of the user are arranged to maintain, in use, a distance of less than 2.5 cm between the l eye and the second light guide.
    [11]
    11. Device according to claim 10, characterized in that the means for immobilizing the device on the head of the user have the shape of a pair of glasses (9), the second light guide replacing at least one of spectacle lenses.
    [12]
    12. Device according to any one of the preceding claims, characterized in that it further comprises batteries and an adjustment unit (10) comprising means for storing data.
    [13]
    13. Device according to any one of the preceding claims, characterized in that it further comprises a sound adjustment device, earphones or other means of sound diffusion.
    [14]
    14. Device according to any one of the preceding claims, characterized in that it further comprises communication means.
    [15]
    15. Use of the device of any one of the preceding claims for the photostimulation of a user.
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US5923398A|1995-06-15|1999-07-13|Enlightened Technologies, Inc.|Interactive light field for non-visual stimulation|
    WO2004109349A2|2003-06-10|2004-12-16|Elop Electro-Optics Industries Ltd.|Method and system for displaying an informative image against a background image|
    US20110214082A1|2010-02-28|2011-09-01|Osterhout Group, Inc.|Projection triggering through an external marker in an augmented reality eyepiece|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    EP011068407|2011-10-21|
    EP11068407|2011-10-21|
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