• 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:
    An object of the present invention is to provide a light transmitting apparatus capable of obtaining a forward clock which is particularly good compared to a conventional lighting lamp. The present invention has polarization separation means (3) for separating unpolarized light irradiated from the light source (1) into p-polarized light and s-polarized light, and irradiating p-polarized light and s-polarized light with vertically and / or horizontally polarized light. A light emitting device is provided.
    公开号:KR20030080200A
    申请号:KR10-2003-0019418
    申请日:2003-03-28
    公开日:2003-10-11
    发明作者:시카노도시야
    申请人:혼다 기켄 고교 가부시키가이샤；
    IPC主号:
    专利说明:

    Floodlight {LIGHT PROJECTOR}
    [14] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to floodlight devices such as headlamps used in vehicles.
    [15] The headlight used for the vehicle is turned on in a situation where it becomes difficult for the naked eye to check the situation ahead. Typically, it is used at night, during heavy rain, when fog occurs, and the like. By the way, when the headlight is turned on at the time of heavy rain or fog occurrence, irradiated light is diffusely reflected by raindrops and water vapor particles, and the wall of the light is blocked in front of the vehicle, and it may encounter a situation in which the clock in front cannot be secured. have.
    [16] As a technique which applied polarization to the headlight of a vehicle, the invention of Unexamined-Japanese-Patent No. 61-253236 is mentioned. The object of the present invention relates to a technique for preventing deception of a driver by a headlamp in a high beam state. More specifically, a polarizing filter is provided in an optical path of a headlamp, and a polarizing filter is placed on the front glass of the opposite difference so that the polarization axis is orthogonal to the polarizing filter, and two high beams are polarized. Blocking with a filter prevents deception.
    [17] However, the invention described in Japanese Patent Laid-Open No. 61-253236 does not assume rain or fog. Therefore, since a polarizing filter is used, there is a problem that the utilization efficiency of light irradiated from a headlamp is poor.
    [18] In addition, since the polarizing filter generally has a low heat resistance temperature (˜50 ° C.), the polarizing filter is heated by the heat of the lamp of the headlamp or the heat of the sunlight to be used when it is attached to a headlamp or the like in the summer. There was a problem that it is worse.
    [19] An object of the present invention is to provide a light emitting device which is excellent in light utilization efficiency and heat resistance as compared with a conventional light emitting device such as a headlamp, and which can obtain a particularly good front clock under adverse conditions of a clock.
    [1] 1 is a diagram showing a relationship between a reflecting surface and an incident surface.
    [2] Fig. 2 is a diagram showing a relationship between s-polarized light, p-polarized light, vertical polarized light, and horizontal polarized light.
    [3] 3 is a graph showing the reflectances respectively when p- and s-polarized light of a predetermined wavelength are incident on glass.
    [4] 4 is a view showing the shape of water droplets flying in the air at the time of farming, heavy rain.
    [5] Fig. 5 is a diagram schematically illustrating a distribution state of light irradiated from a headlamp, and a diagram schematically illustrating a situation of diffuse reflection occurring on the surface of raindrops when light from a headlamp is irradiated.
    [6] 6 is a schematic view showing an embodiment of the light transmitting apparatus of the present invention.
    [7] Fig. 7 is a diagram (a) showing the distribution of light irradiated from the headlamp when the light emitting device of the present invention is turned on during farming and heavy rain, and when the light is irradiated from the light emitting device of the present invention. (B) A schematic drawing of the situation of diffuse reflection.
    [8] 8 is a schematic diagram of a polarizing beam splitter.
    [9] 9 is a schematic view showing another embodiment of the light transmitting device of the present invention.
    [10] [Explanation of symbols on the main parts of the drawings]
    [11] 1: light source 2: collimator lens
    [12] 3: polarized beam splitter 4: reflector
    [13] 5a, 5b: Lens 6: 1/2 wave plate
    [20] This invention was comprised as follows in order to solve the said subject.
    [21] The invention described in claim 1 has polarization separation means for separating non-polarized light irradiated from a light source into p-polarized light and s-polarized light, and the p-polarized light and / or s-polarized light is separated from the vibration plane of the electric field which is substantially perpendicular to the ground. The branch is a light projection apparatus characterized by irradiating as vertically polarized light and / or horizontally polarized light having an oscillating surface of an electric field substantially parallel to the ground.
    [22] According to the invention as set forth in claim 1, the light from the light source is separated into p-polarized light and s-polarized light by polarization separating means, and this p-polarized light and / or s-polarized light has a vertical plane having an oscillating surface of an electric field approximately perpendicular to the ground. By using it as a horizontally polarized light having a vibrating surface of an electric field which is almost horizontal with respect to the polarization and / or the ground, it is possible to obtain a forward clock which is excellent in light utilization efficiency and heat resistance and which is particularly good under adverse conditions of a clock.
    [23] Here, p-polarized light and s-polarized light are defined in terms of polarization splitting means, and p-polarized light has a vibration direction of an electric field parallel to the plane of incidence of the polarization splitting means, and s-polarized light with respect to the plane of incidence of the polarization splitting means. It has a vibration direction of a vertical electric field.
    [24] Here, as shown in FIG. 1, an incident surface is a surface containing the normal line of the reflective surface which light reflects, and the optical axis of incident light.
    [25] On the other hand, vertically polarized light and horizontally polarized light are defined by the vibration direction of the electric field of polarized light with respect to the ground to which light is irradiated, and are different from the above p-polarized light and s-polarized light. Here, the polarized light having the vibration direction of the electric field which is almost perpendicular to the ground (reflection surface) is called vertical polarization, and the polarized light having the vibration direction of the electric field which is almost parallel to the ground (reflection surface) is called horizontal polarization. In other words, vertically polarized light is polarized light having a vibration direction of an electric field parallel to the incident surface when the ground is referred to as a reflective surface, and horizontally polarized light is perpendicular to the incident surface when the ground is referred to as a reflective surface. It can be said to be the polarization which has the vibration direction of an electric field.
    [26] Here, with reference to FIG. 2, the difference between the concepts of s-polarized light, p-polarized light, vertical polarized light, and horizontal polarized light will be described in more detail. FIG. 2 (a) is a diagram showing vibration directions of p-polarized light and s-polarized light separated by polarized light separating means when the polarized light separating means is provided as shown in the drawing with respect to the ground. In Fig. 2A, the separated p-polarized light becomes vertically polarized light having a vibration direction perpendicular to the ground, and the separated s-polarized light is horizontal polarized light having a vibration direction parallel to the ground.
    [27] FIG. 2 (b) shows the vibration directions of p-polarized light and s-polarized light to be separated when the polarization separating means of FIG. 2 (a) is inclined with respect to the ground. In this case, compared with FIG. 2A, since the polarization separation means is inclined with respect to the ground, the s polarization does not coincide with the horizontal polarization, and the p polarization does not coincide with the vertical polarization.
    [28] Invention of Claim 2 irradiates either the said p-polarized light or the s-polarized light to the far side of a light source as a vertical polarization, and irradiates the other side of a light source as horizontal polarized light to the vicinity of a light source. It is a light transmitting device according to claim 1.
    [29] In general, it is known that p-polarized light having a vibration direction parallel to the incident surface has a smaller reflectance when irradiated onto the reflective surface of the object compared to s polarized light having a vibration direction perpendicular to the incident surface.
    [30] However, since the vertically polarized light has a vibration direction parallel to the incident surface when the upper and lower surfaces, the ground, and the like of the raindrops are the reflective surfaces, the water film existing on the raindrops or the road surface is similar to the p-polarized light. The reflectance in the vertical direction when incident to i) becomes smaller than the horizontal polarization.
    [31] In addition, the reflection by raindrops and the road surface which may impede the clock is mainly the reflection which spreads perpendicular to the ground.
    [32] Therefore, by irradiating the vertical polarized light to a remote place of the light source, it is possible to suppress the reflection diffused in the vertical direction, which hinders the field of view due to raindrops, water vapor fine particles, and water film on the road surface during heavy rain or rain, It is possible to maintain the front clock satisfactorily as compared with the conventional light transmitting apparatus for irradiating non-polarized light.
    [33] In addition, since the horizontal polarized light is irradiated to the vicinity of the light source, it is possible to secure the near field of vision and to improve the utilization efficiency of the light irradiated from the light source.
    [34] The invention described in claim 3 has conversion means for irradiating either the p-polarized light or the s-polarized light as the first vertical polarized light, and converting either the s-polarized light or the p-polarized light to the second vertical polarized light. And the first vertically polarized light and the second vertically polarized light are irradiated according to claim 1.
    [35] According to the invention as set forth in claim 3, since both p- and s-polarized light separated by the polarization separating means are irradiated forward as vertical polarization, the watch is formed by raindrops, water vapor fine particles, and water film on the road surface during heavy rain or rain. It becomes possible to suppress the reflection which spreads in the vertical direction which inhibits small, and in this case, it becomes possible to maintain a good front clock compared with the conventional light-emitting device which irradiates unpolarized light.
    [36] The invention according to claim 4 is a light emitting device according to claim 3, wherein a half-wave plate is used as the conversion means.
    [37] According to the invention described in claim 4, since the half wavelength plate is used as the conversion means for converting the s-polarized light into the p-polarized light, it is possible to efficiently convert the s-polarized light into the p-polarized light without almost losing the amount of light.
    [38] The invention according to claim 5 is the light transmitting apparatus according to any one of claims 1 to 4, wherein a substance having birefringence is used as the polarization separating means.
    [39] According to the invention described in claim 5, since a material having birefringence is used as the polarization separating means, it is possible to efficiently separate unpolarized light into s-polarized light and p-polarized light.
    [40] The invention according to claim 6 is the light transmitting device according to any one of claims 1 to 5, wherein the light emitting device is used for a vehicle headlamp.
    [41] According to the invention as set forth in claim 6, the floodlight device is used as a headlamp of a vehicle, and thus it is possible to secure a better front clock under adverse conditions (aggression, heavy rain) compared to a conventional headlamp.
    [42] [Embodiment of the Invention]
    [43] EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described suitably with reference to drawings.
    [44] First, the principle that the light transmitting device of the present invention can secure a better front clock than the conventional one will be described.
    [45] 3 is a graph showing the reflectances respectively when p-polarized light and s-polarized light having a predetermined wavelength are incident on glass (refractive index = 1.51673).
    [46] The vertical axis represents the reflectance, and the horizontal axis represents the incident angle of the light beam when the normal direction of the glass surface (reflection surface) is zero.
    [47] Here, p-polarized light has a vibration direction of an electric field parallel to the incident surface when the glass surface is referred to as a reflective surface, and when the surface parallel to the surface as referred to in the present invention is a reflective surface, it is perpendicular to the ground. It corresponds to the vertical polarization which has a vibration direction which is a direction (refer FIG. 1).
    [48] In addition, the s-polarized light has a vibration direction perpendicular to the incident surface when the glass surface is referred to as the reflective surface, and when the surface parallel to the surface as referred to in the present invention is referred to as the reflective surface, the s-polarized light is parallel to the surface. It corresponds to the horizontally polarized light which has the oscillation direction of (refer FIG. 1).
    [49] According to this graph, it is understood that the reflectance of s-polarized light (horizontal polarized light) is greater than that of p-polarized light (vertical polarized light) except when the incident angles are 0 ° and 90 °. In particular, it is known that the reflectance of the s-polarized light (horizontal polarized light) is twice or more larger than the reflectance of the p-polarized light (vertical polarized light) in the range of 20 to 80 °.
    [50] Although FIG. 3 showed the case where light injects into glass, it is the same also about water (upper and lower surface part) of water droplets, etc., and the reflectance of s polarization (horizontal polarization) is larger than p polarization (vertical polarization).
    [51] By the way, when the headlights of the vehicle are turned on at the time of farming and heavy rain, the wall of light may appear in front of the vehicle by the irradiation light, and the front clock may not be sufficiently secured. This is because light of the headlamp is diffusely reflected by water vapor fine particles or raindrops, and mainly because the light is diffused and reflected perpendicularly to the ground.
    [52] Here, the shape of the water droplet which flies from the air at the time of agricultural and heavy rain is shown in FIG. Although the water droplets are almost (approximately) spherical, the larger the particle diameter is, the more the surface area increases due to the air resistance during the drop. Since the water droplets have such a shape, the light of the headlamp incident from the side is diffusely reflected in various directions, and in particular, diffuses and reflects in the vertical direction with respect to the ground. In addition, since there is a large number of water droplets per unit volume during farming and heavy rain, light diffused as a water droplet once is repeatedly reflected back to a large number of water droplets in the vicinity, so that the light of the headlamp The entire irradiated area shines and it feels as if a wall of light appears in the vicinity of the vehicle, and the clock is blocked by the reflected light in the vertical direction on the ground, making it difficult to see far away.
    [53] The distribution state of the light irradiated from the headlamp at this time is typically shown in FIG. Since the light irradiated from the headlamp is complicatedly diffusely reflected on the surface of water vapor fine particles and raindrops present on the optical path, and forms a wall of light in the vicinity of the vehicle, it is difficult for the driver to secure a field of view far away from the vehicle.
    [54] 5B is a diagram schematically illustrating a situation of diffuse reflection seen from the surface of raindrops when light of the headlamp is irradiated. As shown in FIG.5 (b), light is reflected by the surface of a raindrop many times in many directions, and it feels like a wall of light appears in front of a vehicle. In such a situation, it becomes impossible to confirm the object which can be confirmed in a normal situation.
    [55] Here, if the reflection which diffuses in the vertical direction which mainly hinders the clock as the diffuse reflection of the water irradiated from the headlight and the diffuse reflection by the raindrops can be suppressed, the clock of the front is ensured more than before, and the comfort of the vehicle is more comfortable. It becomes possible to carry out the operation.
    [56] As a means for doing this, if the light irradiated from the headlamp is called vertically polarized light, the reflectance in the vertical direction to the ground of the vertically polarized light is smaller than that of the horizontally polarized light as described above, and thus in the vertical direction as compared with the case of irradiating non-polarized light. The degree of diffused reflection can be made particularly small. In other words, the reflected light diffused in the vertical direction can be suppressed to suppress the light wall, and the clock can be prevented from being obstructed, so that the far clock can be secured satisfactorily.
    [57] 6 is a schematic view showing an embodiment of the light transmitting device of the present invention. This embodiment separates the light irradiated from the light source into p-polarized light and s-polarized light, makes p-polarized light the first vertically polarized light, and converts the further separated s-polarized light into the second vertically polarized light by conversion means. And headlights irradiating the first and second vertical polarizations toward the front of the vehicle.
    [58] On the other hand, in this embodiment, since the polarization beam splitter 3 which is polarization separation means was provided as shown in FIG. 2 (a), the relationship between p polarization = vertical polarization and s polarization = horizontal polarization is established.
    [59] The present light transmitting device includes a light source 1, a collimator lens 2 for arranging the irradiation angle of light (non-polarized light) irradiated from the light source to be parallel light, and the light from the collimator lens 2 Polarizing beam splitter 3 for separating the light into p-polarized light (first vertically polarized light) and s-polarized light (horizontal polarized light), and s-polarized light (horizontal polarized light) separated by the polarized beam splitter 3 With a reflector 4, a half-wave plate 6 for converting s-polarized light (horizontal polarized light) into a second vertical polarized light, and lenses 5a and 5b for irradiating the light irradiated from the light transmitting device forward. Is done.
    [60] On the other hand, the "polarization separation means" as the claim claims correspond to the "beam splitter 3", and the "conversion means" corresponds to the "1/2 wave plate 6", respectively.
    [61] In addition, in this embodiment, although the collimator lens is used in order to make the light from a light source into parallel light, you may use a concave mirror, such as a parabolic mirror, instead.
    [62] The light (non-polarized light) irradiated from the HID (High Intensity Discharge) light, which is the light source 1, becomes parallel light by the collimator lens 2 and then enters the polarizing beam splitter 3. Here, p-polarized light is not reflected by the polarization beam splitter 3, passes through the polarization beam splitter 3, reaches the lens 5a, and is irradiated toward the front of the vehicle as the first vertical polarization. On the other hand, the s-polarized light is reflected by the polarization beam splitter 3 to change the traveling direction, reaches the reflector 4, and after the irradiation direction is adjusted by the reflector 4, the half-wave plate 6 ), The polarization direction is changed to become the second vertically polarized light, and is irradiated to the front of the vehicle through the lens 5b. At this time, the 1/2 wavelength plate 6 is provided at an inclination of 45 ° in the direction of converting the polarization direction with respect to the optical axis so that the polarization direction is changed by 90 °.
    [63] As described above, in the light transmitting apparatus of the present invention, the light irradiated from the light source 1 is separated into p-polarized light and s-polarized light, and p-polarized light is referred to as first vertical polarized light, and s-polarized light is also referred to as second vertical polarized light. Since only a small vertical polarization of the reflectance is irradiated to the front of the vehicle in the vertical direction of the ground, it is possible to suppress the reflection diffused in the vertical direction by water vapor fine particles or raindrops, for example during farming and heavy rain. The front clock can be secured better than before.
    [64] The schematic diagram which shows the effect of the floodlight apparatus of this invention is shown in FIG. Fig. 7 (a) is a diagram showing the distribution of light irradiated from the headlamps when the light emitting device of the present invention is turned on in the event of rain or heavy rain. Since the vertically polarized light irradiated from the headlamp of the present invention enters water vapor fine particles or raindrops, the ratio of diffused light reflected in the vertical direction is significantly smaller than that of conventional headlamps irradiating non-polarized light. The wall does not appear, and the driver can secure a clock far from the vehicle. 7 (b) is a diagram schematically illustrating a situation of diffuse reflection occurring on the surface of raindrops when light is irradiated from the light transmitting device of the present invention. By irradiating vertical polarization as in the present invention, the reflection diffused in the vertical direction generated from the raindrop surface becomes small, and the driver can secure the forward clock without being disturbed by the wall of light.
    [65] In addition, when driving a vehicle in rainy nights, the lights of other vehicles reflected by the water film existing on the road surface enter the clock, so the road surface may look flashy and it may be very difficult to travel. When the floodlight apparatus of the present invention is supplied to many vehicles, the reflection on the road surface of the illumination of other cars can be suppressed even in rainy nights, so that the vehicle can be run more comfortably.
    [66] In addition, the light transmitting device of the present invention converts the s-polarized light separated by the polarization beam splitter 3 into the second vertical polarized light by the half-wave plate 6, so that the light starting from the light source 1 Can be used efficiently.
    [67] As the polarizing beam splitter 3 used here, as shown in FIG. 8, what laminated | stacked the low refractive index thin film and the high refractive index thin film alternately between the opposing surfaces of a glass prism can be used. When the incident light enters the medium at a polarization angle (Brewster '), the polarization beam splitter 3 uses the property that the reflectivity of p-polarized light becomes zero and reflects only s-polarized light. The refractive index and film thickness of each thin film are designed so that incident light enters the surface at a polarization angle. By using the beam splitter 3 having such a structure, the p-polarized light and the s-polarized light can be separated out.
    [68] Here, in order to separate p-polarized light and s-polarized light at right angles, when the refractive index of the thin film of high refractive index is n H , the refractive index of the low refractive film is n L , and the refractive index of glass is n G ,
    [69] n G = 2n H 2 n L 2 / (n L 2 + n H 2 ) ‥‥‥ (1)
    [70] It is necessary to satisfy the relationship of equation (1).
    [71] For example, when ZrO 2 (n H = 2.04) is used as the high refractive index material and MgF 2 (n L = 1.385) is used as the low refractive index material, a glass having a refractive index (n 6 ) of 1.62 may be used.
    [72] On the other hand, although FIG. 8 emphasizes the multilayer structure of a high refractive index film and a low refractive index film, the actual thickness is thin.
    [73] As the polarizing beam splitter 3, it is also possible to use one that separates p-polarized light and s-polarized light using birefringence. When non-polarized light is incident on a material having birefringence, the p-polarized light and the s-polarized light have a difference in the speed of propagation of the crystal, so that both can be taken out separately. Examples of the material exhibiting birefringence include calcite (CaCO 3 ) and the like, and by producing the polarizing beam splitter 3 by crystallization of the calcite, it becomes possible to separate out p-polarized light and s-polarized light. .
    [74] The light transmitting apparatus of the present invention separates light from a light source into p-polarized light and s-polarized light, converts s-polarized light into vertical polarized light, and irradiates it to the front of the vehicle. Inevitably, each process (p-polarized light and s-polarized light) is performed. In the step of separating and the step of converting the s-polarized light into the vertically polarized light, a slight amount of light is generated, but more than that, it is expected that the front clock under poor conditions will be better. In addition, the light source 1 to be used is not limited to a HID lamp, and a lamp using a filament can also be used conventionally.
    [75] In the present embodiment, the s-polarized light separated by the polarization beam splitter 3 is irradiated to the front with the first vertical polarized light as the second vertical polarized light by the half-wave plate 6, but 1 A light transmitting device that does not use the / 2 wavelength plate 6 is also contemplated.
    [76] The light transmitting device in the other embodiment shown in FIG. 9 has the same structure as the light transmitting device shown in FIG. 6 except that the half-wave plate 6 is not used. In the light transmitting device, the s-polarized light separated by the polarization beam splitter 3 is irradiated to the vicinity of the vehicle as the horizontally polarized light without s-polarized light. In the case of irradiating light in the vicinity of the vehicle, the diffuse reflection is not a big problem. Thus, by irradiating the horizontally polarized light in the vicinity of the vehicle, it is possible to secure a sufficient amount of light in the vicinity of the vehicle. In addition, since the vertically polarized light based on one p-polarized light causes the far side of the vehicle to be irradiated, the far-field clock can be improved even under adverse conditions.
    [77] Again, in the above-described embodiment, an example in which the light emitting device of the present invention is applied to headlamps such as headlamps and fog lamps has been disclosed. However, the application of the present invention is not limited thereto, for example, rear fog lamps (rear). It is also possible to apply to light emitting devices such as fog lamps, tail lamps, stop lamps and back lamps. By using the light-emitting device of the present invention for these lamps, even when it is difficult to secure a sufficient forward field of vision (heavy rain, agriculture, etc.), the light irradiated from these lamps is suppressed by raindrops and water vapor fine particles. This makes it possible for the subsequent car to easily recognize the presence of the own car.
    [78] In addition, the light emitting device of the present invention can be applied to a search light, a flashlight, a lighthouse lighting device, and the like, and can be applied to a light emitting device used for public use, military use, leisure use, security use, and the like. It is possible to secure the front clock better than in the prior art under adverse conditions.
    [79] As mentioned above, although embodiment of this invention was described, this invention is not limited only to description of these embodiment, Various changes which embody the technical idea of this invention are possible.
    [80] Since the present invention is configured as described above, the following remarkable effects are obtained.
    [81] The light transmitting device of the present invention separates light emitted from a light source into p-polarized light and s-polarized light by means of polarization separating means, and has a vertically polarized light having an oscillating surface of an electric field which is almost perpendicular to the ground, and / or an almost electric field parallel to the ground. Since the light is irradiated as horizontally polarized light having an oscillation surface, it is possible to obtain an exceptionally good forward clock, which is excellent in light utilization efficiency and heat resistance and under bad conditions of the clock (claim 1).
    [82] Since the light transmitting device of the present invention irradiates the far side of the light source with a vertical polarization having a small reflectance with respect to the vertical direction of the ground, non-polarized light reflects the reflection diffused in the vertical direction generated from the surface of raindrops and water vapor fine particles during heavy rains or rain. It becomes possible to reduce compared with the conventional light transmitting apparatus which irradiates light. For example, if the light emitting device of the present invention is applied to a headlamp for a vehicle, the driver can secure a sufficient front clock even in such a situation. Moreover, since horizontal polarization is irradiated to the vicinity of a light source, the light which generate | occur | produces from a light source can be used without waste, and it becomes possible to ensure the clock | path near a vehicle (claim 2).
    [83] The light projector of the present invention separates light irradiated from the light source into p-polarized light and s-polarized light, and either p-polarized light and s-polarized light are the first vertically polarized light and the other s that does not become vertically polarized light. Either polarized light or p-polarized light is converted into second vertical polarized light by conversion means such as a half-wave plate, and the first and second vertical polarized light are irradiated. Thus, for example, when the floodlight of the present invention is applied to a headlamp for a vehicle, it is possible to increase the amount of light of vertically polarized light having a small reflectance with respect to the vertical direction of the ground, and to further secure a front clock (claim 3, 4).
    [84] By using a material having birefringence as polarization separation means, it becomes possible to efficiently separate unpolarized light generated from a light source into s-polarized light and p-polarized light (claim 5).
    [85] By using the floodlight of the present invention for a headlamp for a vehicle, it becomes possible to improve the front clock at the time of farming or heavy rain in comparison with the conventional one (claim 6).
    权利要求:
    Claims (6)
    [1" claim-type="Currently amended] Polarized light separating means for separating unpolarized light irradiated from a light source into p-polarized light and s-polarized light, and the p-polarized light and / or s-polarized light are divided into a vertically polarized light and / or a ground having an oscillating surface of an electric field almost perpendicular to the ground. And irradiating as horizontally polarized light having an oscillating surface of an electric field that is substantially parallel to each other.
    [2" claim-type="Currently amended] The method of claim 1, wherein either the p- or s-polarized light is irradiated to the far side of the light source as vertical polarized light, and either the s-polarized light or p-polarized light is irradiated to the vicinity of the light source as horizontal polarized light. Floodlight device.
    [3" claim-type="Currently amended] 2. The apparatus according to claim 1, further comprising conversion means for irradiating any one of said p-polarized light or s-polarized light as a first vertical polarized light and converting either of said s-polarized light or p-polarized light into a second vertical polarized light. And a first vertical polarized light and a second vertical polarized light.
    [4" claim-type="Currently amended] 4. A light emitting apparatus according to claim 3, wherein a half wavelength plate is used as said converting means.
    [5" claim-type="Currently amended] The light transmitting device according to any one of claims 1 to 4, wherein a material having birefringence is used as the polarization separating means.
    [6" claim-type="Currently amended] The light projector according to any one of claims 1 to 5, wherein the light projector is used for a vehicle headlight.
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    CA2424131A1|2003-10-05|
    CN1449950A|2003-10-22|
    US7070308B2|2006-07-04|
    DE60313389D1|2007-06-06|
    DE60313389T2|2007-08-16|
    EP1351015B1|2007-04-25|
    EP1351015A3|2005-01-19|
    CA2424131C|2007-01-16|
    US20030189839A1|2003-10-09|
    EP1351015A2|2003-10-08|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2002-04-05|Priority to JPJP-P-2002-00104005
    2002-04-05|Priority to JP2002104005A
    2003-03-28|Application filed by 혼다 기켄 고교 가부시키가이샤
    2003-10-11|Publication of KR20030080200A
    优先权:
    申请号 | 申请日 | 专利标题
    JPJP-P-2002-00104005|2002-04-05|
    JP2002104005A|JP2003297116A|2002-04-05|2002-04-05|Projecting light device|
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