JP2006019050A - Vehicular infrared light projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that red light cannot be suppressed effectively by a conventional vehicular infrared light projector. <P>SOLUTION: The vehicular infrared light projector is provided with a main reflecting face 9; a discharge lamp 2; a non-spherical projection lens 3; a filter 4 having infrared light transmitting property located at flat non-spherical face side of the projection lens 3, arranged in a light passage of reflected light L6 which is a light L4 emitted from the discharge lamp 2 and reflected on the main reflecting face 9; and sub-reflection faces 13, 16 arranged on the outer peripheral part side of the projection lens 3, reflecting a light L5 travelling from the discharge lamp 2 without passing through the filter 4, and making the reflected light incident on outer peripheral part of the projection lens 3. The color of the lights L1, L2 reflected by the main reflection face 9, passing through the filter 4, and incident on the non-spherical side thereof; and the color of the light L3 incident on the outer peripheral part from the sub-reflection faces 13, 16 without passing through the filter 4, led to the outer peripheral part at opposite side by a reflecting action of the filter 4 and a light guide action of the projection lens 3; are mixed at the projection lens 3, and irradiated outward. As a result, the red light can be effectively suppressed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an infrared lamp, and more particularly to an infrared lamp capable of effectively suppressing red light.

  Conventionally, an infrared lamp for a vehicle is known. An infrared lamp for a vehicle is mounted on a front portion of a vehicle, for example, and is used in a near-infrared light night-vision camera device that supports night driving, and irradiates infrared light (infrared rays) in front of the vehicle. By doing so, it functions as illumination of the device. In such a vehicular infrared lamp, infrared light close to the visible light region is also irradiated, so that red light (red light emission) is visually recognized from the outside at the time of the lamp light. Such red light may be mistaken for lighting of a stop lamp or tail lamp, and is not preferable for safety.

  In this regard, a technique described in Patent Document 1 is known for a conventional infrared lamp. A conventional infrared lamp is composed of a light source and a filter that transmits infrared light components, and has a region that transmits light from the light source as it is on the outer periphery of the filter. In such a configuration, light transmitted through the filter is irradiated as red light, and light transmitted from the filter outer periphery is irradiated as white light. Then, by mixing these lights, the red light is relatively thinned.

JP 2003-19919 A

  However, the conventional infrared lamp has a problem that although red light is diluted at a distance, the red light can be visually recognized in the vicinity without being diluted. Specifically, since the center of the irradiation light appears red and the surroundings appear white, a sufficient effect has not been obtained.

  Then, this invention is made in view of the above, Comprising: It aims at providing the infrared lamp device which can suppress red light effectively.

  To achieve the above object, an infrared lamp for a vehicle according to a first aspect of the present invention is arranged near a first focal point of a main reflector having a main reflection surface based on a spheroid and a main reflection surface. A light source, an aspheric projection lens, and a red light disposed on the plane aspheric surface side of the projection lens and in the optical path of the reflected light reflected from the main reflection surface, which is light from the light source A filter having external light transmission characteristics and a sub-reflecting surface that is disposed on the outer peripheral side of the projection lens and reflects light traveling from the light source without passing through the filter to be incident on the outer peripheral portion of the projection lens. A sub-reflector, and the projection lens transmits light that has passed through the filter through the main reflection surface and is incident on a flat aspheric surface side, and is incident on the sub-reflection surface without passing through the filter. And is incident on the part and the light guided to the outer peripheral portion of the opposite side by a light guide effect of the reflecting action and the lens of the filter, is mixed is irradiated to the outside, characterized in that.

  According to a second aspect of the present invention, there is provided a vehicular infrared lamp according to a second aspect of the present invention, a lens, a filter having infrared light transmission characteristics, and first light incident means that transmits light through the filter and enters the lens. Second light incident means for causing light to enter the outer peripheral portion of the lens without passing through the filter, and the lens is transmitted through the filter by the first light incident means, The light incident on the outer peripheral portion without passing through the filter by the second light incident means and the light guided to the outer peripheral portion on the opposite side by the reflecting action of the filter and the light guiding action of the lens are mixed to the outside. Irradiation.

  According to the vehicle infrared light lamp of the first aspect of the present invention, light (red light) transmitted through the filter by the main reflection surface and incident on the flat aspheric surface side of the projection lens and the sub-reflection surface pass through the filter. Since the light incident on the outer periphery of the projection lens is mixed in the lens and radiated to the outside, it is closer than the conventional vehicle infrared light lamp that performs color mixing in the distance. There is an advantage that red light can be reduced.

  According to the vehicle infrared light lamp of the invention of claim 2, the light (red light) transmitted through the filter by the first light incident means and incident on the lens is passed through the filter by the second light incident means. Without mixing the light incident on the outer periphery of the lens, it mixes the color inside the lens and irradiates the outside. Therefore, compared with the conventional vehicular infrared lamp that performs color mixing at a distance, it is more red in the vicinity. There is an advantage that light can be reduced.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements of the embodiments described below include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  FIGS. 1-3 is a figure which shows the infrared light lamp for vehicles concerning this Example 1. FIG. Hereinafter, the configuration of the vehicle infrared light lamp according to the first embodiment will be described.

  The vehicle infrared lamp 1 is composed of a projector-type lamp unit. The vehicle infrared light lamp 1 includes a discharge lamp 2 as a light source, a projection lens (condensing lens) 3 as a lens, a filter 4, a main reflector 5, a sub reflector 6, and a holder (frame). 8. The vehicular infrared light lamp 1 has a light L3 (white light, green light, cyan light, not transmitted through the filter 4) with respect to the red light L1 (including the infrared light L2) transmitted through the filter 4. Other colored light) is guided into the projection lens 3, and the light L3 is placed on the optical path of the red light L1 in the projection lens 3 to be mixed. In addition, in this infrared light lamp 1 for vehicles, the irradiation direction of the light is made into the front, and the reverse direction is called back.

  The main reflector 5 has a shape in which the front side is opened and the rear side is closed. A through hole 7 through which the discharge lamp 2 is inserted is provided at the center of the rear part of the main reflector 5. On the inner concave surface of the main reflector 5, aluminum deposition or silver coating is applied, and a free-form main reflection surface 9 based on a spheroidal surface is provided. The main reflecting surface 9 has a first focal point F1 and a second focal point F2. The main reflector 5 is fixedly held by the holder 8. As shown in FIG. 1, the main reflection surface 9 reflects a part of the light L4 from the light L4 and L5 from the discharge lamp 2 to the projection lens 3 as reflected light L6 and transmits it to the filter 4. And is incident on the projection lens 3. The main reflection surface 9 is formed of a non-colored reflection surface, and reflects the light from the discharge lamp 2 with the same chromaticity.

  The discharge lamp 2 is a so-called high pressure metal vapor discharge lamp such as a metal halide lamp, a high intensity discharge lamp (HID), or the like. The discharge lamp 2 is detachably attached to the main reflector 5 via a socket mechanism 11. The light emitting portion 12 of the discharge lamp 2 is located in the vicinity of the first focal point F <b> 1 of the main reflecting surface 9 of the main reflector 5. The discharge lamp 2 has a wavelength characteristic as shown in FIG. In FIG. 2, the horizontal axis indicates the wavelength of light emitted from the discharge lamp 2, and the vertical axis similarly indicates the luminous intensity of light emitted from the discharge lamp 2. As shown in FIG. 2, the discharge lamp 2 emits light including infrared light (near infrared light). In addition to the discharge lamp 2, the light source may be a halogen bulb or an incandescent bulb.

  The projection lens 3 is an aspherical lens. The front side of the lens 3 forms a convex aspheric surface, while the rear side of the lens 3 forms a flat aspheric surface. The lens 3 is supported by the holder 8.

  The filter 4 is made of an infrared light transmitting film, and is on the flat aspherical side of the projection lens 3 and is in the optical path of the reflected light L6 reflected from the main reflecting surface 9 and from the discharge lamp 2. Is arranged. In this example, the filter 4 is directly deposited on a flat aspheric surface on the rear side of the lens 3. As shown in “Transmission wavelength region of infrared filter” in FIG. 2, the filter 4 includes visible light L3 having a wavelength of about 800 nm or less among the components of the light L4, L5, and L6 from the discharge lamp 2. It has the characteristic of reflecting the component and transmitting the component of infrared light L2 having a wavelength of about 800 nm or more (infrared light transmission characteristic). From the filter 4, light having a longer wavelength among visible light L3 components is transmitted as red light L1 without being reflected.

  The sub-reflector 6 is disposed on the outer peripheral side of the projection lens 3. In this example, the sub-reflector 6 is composed of an inner panel that is concealed so that the inside of the lamp cannot be seen from the outside of the projection lens 3. The sub-reflector 6 includes a trapezoidal cylindrical portion 14 and an inclined disk 15. A first sub-reflecting surface 13 and a second sub-reflecting surface 16 are provided on the trapezoidal cylindrical portion 14 and the inclined disk 15 of the sub reflector 6, respectively. The first sub-reflecting surface 13 and the second sub-reflecting surface 16 are light L5 that travels from the discharge lamp 2 without passing through the filter 4 (mainly direct light, an opening provided in the holder 8). The light passing through 10 is reflected and made incident on the outer periphery of the projection lens 3. The first sub-reflecting surface 13 and the second sub-reflecting surface 16 are uncolored reflecting surfaces, and reflect the light L5 from the discharge lamp 2 with the same chromaticity. Alternatively, by coloring the first sub-reflecting surface 13 and the second sub-reflecting surface 16 in green or any other color, the first sub-reflecting surface 13 and the second sub-reflecting surface 16 are reflected and the The chromaticity of the light L3 incident on the outer periphery of the projection lens 3 can be changed to green or any other color.

  The optical axis of the projection lens 3 and the optical axis of the main reflecting surface 9 are substantially on the same axis ZZ. As a result, the first focal point F1 and the second focal point F2 of the main reflecting surface 9 are located on the optical axis ZZ. Further, the discharge lamp 2, the projection lens 3, the filter 4, the main reflector 5, the sub reflector 6, and the holder 8 of the vehicular infrared lamp 1 include a lamp housing (not shown) and a substantially transparent outer lens. Are arranged in a lamp compartment partitioned by a lamp lens (not shown). The sub reflector 6 is fixed to the lamp housing.

  The vehicle infrared light lamp 1 according to the first embodiment is configured as described above, and the operation of the vehicle infrared light lamp 1 according to the first embodiment will be described below.

  In this vehicle infrared light lamp 1, first, a part of the light L4 from the discharge lamp 2 is reflected by the main reflecting surface 9, and the reflected light L6 is transmitted through the filter 4 to transmit the transmitted light L1. , L2 enters the lens 3 (see FIG. 1). The transmitted light L1 and L2 are mainly composed of the light L2 of the infrared light component from which the visible light component is removed by the function of the filter 4. However, the transmitted light L1, L2 includes a visible light component (red light L1) having a long wavelength. On the other hand, of the light from the discharge lamp 2, another part of the light L 5 passes through the outer periphery of the filter 4, that is, the opening 10 of the holder 8 without passing through the filter 4, and enters the sub reflector 6. The light L5 is reflected by the first sub-reflecting surface 13 and the second sub-reflecting surface 16 of the sub reflector 6.

  The reflected light L3 reflected by the first sub-reflecting surface 13 and the second sub-reflecting surface 16 enters the projection lens 3 from the outer peripheral portion of the projection lens 3 on the convex aspheric surface side. As shown in FIGS. 1 and 3, the light L3 incident on the projection lens 3 is reflected by the filter 4, totally reflected twice on the convex aspheric surface of the projection lens 3, and further reflected by the filter 4 to be projected. The lens 3 is guided to the outer peripheral portion on the convex aspheric surface side of the lens 3 and to the outer peripheral portion on which the reflected light L3 is incident and the outer peripheral portion on the half body side. That is, the reflected light L3 is guided to the outer peripheral portion on the opposite side to the incident side by the reflection action of the filter 4 and the light guide action of the projection lens 3. The reflected light L3 is placed on the optical path of the transmitted light L1 and L2 in the projection lens 3. Thereby, the red light L1 and the light L3 from the discharge lamp 2 out of the transmitted light L1 and L2 are mixed in the projection lens 3. Due to this color mixture, the red light L1 is blurred and extinguished by the light L3 from the discharge lamp 2. This mixed color light (synthetic light) L7 is irradiated forward as light having no red color, and is used, for example, as illumination for a near-infrared light night-vision camera device.

  The vehicular infrared light lamp 1 according to the first embodiment is configured and operated as described above. Hereinafter, the effects of the vehicular infrared light lamp 1 according to the first embodiment will be described.

  According to the vehicular infrared light lamp 1, the red light L1 of the transmitted light L1 and L2 in the projection lens 3 and the light L2 from the discharge lamp 2 are mixed, so that the conventional color mixing is performed at a distance. There is an advantage that the red light L1 can be reduced in the vicinity in comparison with the vehicle infrared light lamp. Moreover, according to this infrared light lamp 1 for vehicles, since the light quantity of the infrared light L2 contained in the transmitted light L1 and L2 is not reduced, there exists an advantage by which the illumination function is maintained.

  In particular, according to this vehicular infrared light lamp 1, since the discharge lamp 2 is used as a light source, the amount of red light L1 in the light emitted from the discharge lamp 2 is small as shown in FIG. On the other hand, since the color temperature of the light emitted from the discharge lamp 2 is high, the red light L1 can be reliably turned off.

  FIG. 4 is a diagram showing a vehicle infrared light lamp 100 according to a second embodiment of the present invention. In the figure, the same components as those in the vehicle infrared light lamp 1 of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The vehicle infrared light lamp 100 according to the second embodiment projects a filter 40 substantially the same as the filter 1 and the filter 4 according to the first embodiment on the vehicle infrared light projector 1 according to the first embodiment. The lens 3 is not directly deposited on the flat aspherical surface but is provided separately from the projection lens 3 so as to face the flat aspherical surface of the projection lens 3. The filter 40 is formed by forming an infrared light transmitting film on a light transmitting substrate.

  The vehicular infrared lamp 100 according to the second embodiment is different from the vehicular infrared light projector 1 according to the first embodiment in that the shape of the sub reflector 60 is the same as that of the sub reflector 6 of the first embodiment. Slightly different. That is, the sub-reflector 60 according to the second embodiment includes the cylindrical portion 17 and the disc 18. A first sub-reflection surface 19 and a second sub-reflection surface 20 are provided on the cylindrical portion 17 and the disc 18 of the sub-reflector 60, respectively.

  The vehicle infrared light lamp 100 according to the second embodiment can achieve substantially the same function and effect as the vehicle infrared light projector 1 according to the first embodiment.

  Hereinafter, examples other than the first and second embodiments will be described. In the first and second embodiments, the first sub-reflection surfaces 13 and 19 and the second sub-reflection surfaces 16 and 20 of the sub reflectors 6 and 60 are not colored. However, in the present invention, the sub-reflecting surface of the sub-reflector may be colored. For example, when colored green, green light and red light are mixed, so that the red light is more effectively compared with the vehicle infrared light lamps 1 and 100 that mix white light and red light. There is an advantage that can be reduced. That is, the red light becomes almost yellow due to the mixed color of the green light, which is preferable in that the red light can be effectively reduced. In addition to the green color, for example, by coloring in cyan, cyan light and red light are mixed into white light. As described above, the first sub-reflecting surfaces 13 and 19 and the second sub-reflecting surfaces 16 and 20 of the sub-reflectors 6 and 60 are arbitrarily colored, and the color of the combined light is selected by selecting the chromaticity of the light to be mixed. There is an advantage that the degree can be adjusted arbitrarily. This also has the advantage that design variations can be diversified.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows the infrared light lamp for vehicles concerning Example 1 of this invention. Similarly, it is a graph which shows the characteristic of the light which a discharge lamp radiates | emits. Similarly, it is explanatory drawing which shows the optical path in a projection lens. It is a longitudinal cross-sectional view which shows the infrared light lamp for vehicles concerning Example 2 of this invention.

Explanation of symbols

1,100 Infrared lamp for vehicles 2 Discharge lamp (light source)
3 Projection lens 4, 40 Filter 5 Main reflector 6, 60 Sub reflector 7 Through hole 8 Holder (frame)
9 Main reflecting surface 10 Opening portion 11 Socket mechanism 12 Light emitting portion 13, 19 First sub-reflecting surface 14 Trapezoidal cylindrical portion 15 Inclined disc 16, 20 Second sub-reflecting surface 17 Cylindrical portion 18 Disc F1 First focus F2 Second focus,
L1 Red light L2 Infrared light L3 Light not passing through the filter L4, L5 Light from the discharge lamp L6 Reflected light L7 Mixed color light

Claims (3)

In a projector-type vehicle infrared light lamp that is installed in a vehicle and emits infrared light,
A main reflector having a main reflecting surface based on a spheroid;
A light source disposed near the first focal point of the main reflecting surface;
An aspheric projection lens;
A filter having an infrared light transmission characteristic that is disposed on an optical path of reflected light that is light from the light source and reflected by the main reflecting surface, on the flat aspheric surface side of the projection lens;
A sub-reflector having a sub-reflecting surface that is disposed on the outer peripheral side of the projection lens and reflects light traveling from the light source without passing through the filter to be incident on the outer peripheral portion of the projection lens;
With
The projection lens passes through the filter through the main reflection surface and enters the flat aspheric surface side, enters the outer peripheral portion without passing through the filter by the sub-reflection surface, and reflects the reflection of the filter and the The light guided to the outer peripheral portion on the opposite side by the light guide action of the lens is mixed and irradiated to the outside.
An infrared lamp for a vehicle characterized by that. In a vehicle infrared light lamp that is installed in a vehicle and emits infrared light,
A lens,
A filter having infrared light transmission characteristics;
First light incident means for allowing light to pass through the filter and enter the lens;
Second light incident means for causing light to enter the outer periphery of the lens without passing through the filter;
With
The lens is transmitted through the filter by the first light incident means and incident on the outer peripheral portion without passing through the filter by the second light incident means, and the reflection action of the filter and the lens The light guided to the outer peripheral part on the opposite side by the light guiding action is mixed with color and irradiated to the outside.
An infrared lamp for a vehicle characterized by that. The first light incident means includes a single light source that transmits light through the filter and enters the lens.
The second light incident means includes the one light source and a sub-reflector that causes light from the one light source to enter the lens without passing through the filter.
The infrared light lamp for vehicles according to claim 2 characterized by things.

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