JPH0939651A - Vehicle lighting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular lighting fixture of high design quality without any loss of safety. SOLUTION: A red filter 4 is laid in front of lamp 10 housed in a case 11, and a hologram 5 for reflecting and diffracting back external light outside a vehicle according to the preset pattern as well as allowing the transmission of light from a light source, is provided inside a transparent substrate 9 of the case 12 and on the opening side of the case 12 of the red filter 4.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a vehicular lamp. In particular, the present invention relates to a vehicle warning light that is placed on a rear parcel shelf or the like of an automobile and warns the braking operation of the vehicle toward the rear.

[0002]

2. Description of the Related Art Conventionally, when braking or reversing a vehicle,
As a method of informing the rear vehicle of such information when the traveling direction is changed, it is usual to turn on a brake lamp, a backward light, a direction indicator, etc. located above the bumper.

In recent years, there has been proposed and put into practical use a device in which a light emitting portion of a brake lamp is placed at a relatively high position near a rear glass (hereinafter referred to as a high mount stop lamp).

[0004]

However, not only the role as a means for transmitting information, which is the original purpose of lamps such as brake lamps, but also the improvement of these designs is required from the design of the entire vehicle. Therefore, there has been a demand for a lighting device whose design is improved without impairing safety.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and in a vehicle lamp for irradiating light from a light source toward a rear vehicle through a coloring filter, the coloring A predetermined pattern is recorded on the vehicle exterior side of the filter, and has a hologram arranged on the vehicle exterior side of the colored filter or on a transparent substrate, and the hologram is a predetermined pattern in which outside light outside the vehicle is recorded. The vehicle lamp is characterized by being a hologram that reflects and diffracts toward the rear vehicle and transmits light from the light source when the light source is turned on.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in more detail with reference to the drawings. FIG. 1 is a conceptual diagram showing a case where a high mount stop lamp is configured as an example of a vehicle lamp according to the present invention. In FIG. 1, 1 is a rear glass, 2 is a black ceramic hiding layer, 3 is a synthetic resin frame, 4
Is a red filter which is a colored filter, 5 is a hologram, 6
Is a rear parcel shelf, 7 is a trunk lid, 8 is a vehicle body, 9 is a transparent substrate, 10 is a lamp, 11 is a reflector, and 12
Is the case.

A frame 3 made of synthetic resin and a black ceramic hiding layer 2 are formed on the periphery of the rear glass 1.

The lamp 10 is housed in the case 12 such that the lamp reflector 11 is arranged on the inner side of the case 12. A red filter 4 is arranged on the front surface of the lamp 10, and the red filter 4 is further attached to the case 1
The hologram 5 attached to the inside of the case 12 of the transparent substrate 9 is arranged on the side of the opening in 2. Case 1
2 is fixed to the rear parcel shelf 6.

Here, the red filter 4 has the vertical transmission characteristic shown in FIG. 2, and the hologram 5 has the vertical transmission characteristic shown in FIG.

As the hologram 5, a Lippmann type reflection hologram made of an acrylic photopolymer having a thickness of 20 μm was used. In this example, the center diffraction wavelength is 518
The reference light and the object light were exposed from both sides of the hologram material by parallel light so that the incident angle including the transparent substrate 9 was 60 ° and the diffraction angle was 0 ° in nm. At this time, as the object light, the transmitted light of frosted glass having a particle size of # 600 on both sides was used. Before the exposure for obtaining the display pattern, an unnecessary portion of the display pattern was exposed to ultraviolet rays using a mask.

Therefore, for example, at the time of lighting by a braking warning issued in synchronization with the braking operation, the light emitted from the lamp 10 becomes red light which has passed through the red filter 4 having the vertical transmission characteristic shown in FIG. Therefore, in the hologram 5 having the vertical transmission characteristic shown in FIG. 3, this red light is transmitted,
Red light is emitted toward the following vehicle and acts as a braking warning light.

On the other hand, when the lamp 10 is not lit, the interior of the warning lamp is dark, so that the light diffracted by the hologram 5 due to external light such as sunlight is displayed on the display pattern 13 as shown in FIG. To be seen.

The hologram 5 is usually several μm to several tens μm.
An embossed type, a rainbow type, and other so-called holograms can be widely used as long as they have a thickness and an appropriate area and have a light diffraction function. As the hologram material, various photosensitive materials such as dichromated gelatin, photoresist, silver salt, and polyvinylcarbazole-based photopolymer can be used, but those having high transparency are preferable.

The center diffraction wavelength of the hologram, the incident angle, and the diffraction angle are set in consideration of the hologram installation angle, the incident direction of external light, the display direction of the display pattern, the wavelength distribution of light to be transmitted, the installation angle of the lamp, and the like. It is decided as appropriate.

In this embodiment, the red filter 4 has a thickness of 2
Although a synthetic resin (acrylite carmine manufactured by Mitsubishi Rayon Co., Ltd.) made of mm-methyl methacrylate is used, a resin or film such as glass or polycarbonate may be used, and various changes such as giving a lens function to the surface are possible. Although it is not specified if it has a similar function, it is determined in consideration of the transmission characteristics and durability.

Further, as the transparent substrate 9, a transparent synthetic resin (Acrylite clear made by Mitsubishi Rayon) having a thickness of 2 mm and made of methyl methacrylate is used, and the hologram 5 is attached through an acrylic adhesive (not shown). However, it may be a resin such as glass or polycarbonate, and is not specified as long as it has a similar function, but it is determined in consideration of the refractive index, the transmittance, the durability, and the like.

Two 12V18W tungsten lamps were used as the lamp 10 in this embodiment, but there is no particular limitation as long as sufficient brightness such as a halogen lamp or an LED can be obtained.

As the warning information to be displayed, a stop lamp, a backward movement, etc., which is appropriately selected depending on the intended use and indicates a braking operation, etc., can be cited as an example. Also,
The display pattern 13 based on the hologram 5 can be variously changed without being restricted by the pattern shown in FIG. 4, and may be a character or a figure, or may be a three-dimensional object exposed.

FIG. 5 is a conceptual view showing another example of the basic structure of the vehicle lamp of the present invention. A transparent substrate 9 and a red filter 4 are formed by using acrylic adhesives (not shown) on both sides of the hologram 5. It is intended to be placed between the. In this case, the transparent substrate 9 and the red filter 4 are disposed so as to be in close contact with each other, which is preferable from the viewpoint of durability, and the durability is further improved by sealing with a transparent adhesive such as an epoxy or acrylic adhesive. Expected In the case of this example, the position of the display pattern of the hologram 5 and the display position of the red color at the time of lighting are substantially the same position, so the example of FIG. 1 is more attractive in terms of design.

Further, instead of the red filter 4, a resin having a transmission characteristic equivalent to that of the red filter 4 may be overcoated on the hologram 5 attached to the transparent substrate 9 or a film may be used. Transparent substrate 9 instead
A resin having a transmission characteristic equivalent to the above may be overcoated on the hologram 5 attached to the red filter 4 side, or a film may be attached.

Further, FIG. 6 is also a conceptual view showing another example of the basic construction of the vehicle lamp of the present invention, which is a hologram 50.
Instead of the transparent substrate 9 is attached to the inside of the rear glass 1 inside the vehicle.

FIG. 7 is also a conceptual view showing another example of the basic construction of the vehicle lamp of the present invention, which is a hologram 50.
Is attached to the inside of the rear glass 1 instead of the transparent substrate 9, and the red filter 4 is also attached.

In the case of FIGS. 6 and 7, the hologram 5 is used.
Since the installation angle of 0 is different from the hologram 5 of the embodiment of FIGS. 1 and 5, the incident angle and the diffraction angle are changed, and the lamp 10
In order to prevent the above light from leaking to the peripheral portion, the case 12 was also changed to form the case 120 having the opening close to the glass 1.

In these examples, the stop lamp is arranged on the lower part of the rear glass, but the stop lamp may be provided on the upper part of the rear glass without being restricted by this, and as shown in FIG. It may be 121.

The examples shown in FIGS. 6, 7, and 8 are effective configurations in the case of a lamp such as a high mount stop lamp installed inside the rear glass 1 inside the vehicle.

On the other hand, when the constituent members of the vehicle lamp of the present invention are divided into the rear glass 1 side and the lamp body side as shown in FIGS. Since the management and the number of mounting steps are complicated, the embodiment shown in FIGS. 1 and 5 is preferable in practice.

In the above example, the high mount stop lamp is mounted on the vehicle, but is not limited to this, and may be used in a brake lamp, a backward light, a turn signal, etc. located above the bumper, It can be easily changed, and can also be changed as a decorative lamp.

In the above-described embodiment, the holograms 5 and 50 are configured to diffract external light from the upper direction due to sunlight or the like, but they may be diffracted to diffract the light of the headlamp of the following vehicle. Reference numeral 50 may be a stack of holograms having a plurality of different light diffraction functions or patterns. Further, a single hologram material is subjected to multiple exposure with light having different properties to form a plurality of light diffraction functions or patterns. It may be one.

In any case, the hologram is capable of sufficiently transmitting the light, which has passed through the coloring filter from the light source, to the rear side. In this case, the diffraction characteristic of the hologram is appropriately set in consideration of the light amount of the light source, the transmission characteristic of the coloring filter, etc. so that the light emission information of the lamp can be accurately identified in the rear.

More specifically, as the diffraction characteristic of the hologram, the chromaticity of the mixed light of the transmitted light from the light source and the diffracted light by the hologram when the light source is turned on is y ≦ 0 in JIS-Z8701 chromaticity coordinates. Those satisfying the condition of 0.335 and z ≦ 0.008 are preferable.

In addition to the above, as the diffraction characteristic of the hologram, the chromaticity of the mixed light of the transmitted light from the light source and the diffracted light by the hologram when the light source is turned on is CIE (1931).
In the standard color system, y ≦ 0.33 and y ≦ 0.98-x
Is preferably satisfied.

The parameters of the diffraction characteristics of the hologram include the center wavelength of the diffraction peak, the diffraction efficiency, and the half width.
On the other hand, depending on the amount of light from the light source, the transmission characteristics of the red filter, etc., for example, this amount of light has a very small value, and when the light of the wavelength corresponding to blue is diffracted by the hologram, when the light source is turned on. The red color as a stop lamp may not appear.

Therefore, various means such as setting the central wavelength of the light diffracted by the hologram to the long wavelength side and setting the diffraction efficiency to a small value are used to provide a red (chromaticity) sufficient as a stop lamp when the light source is turned on. In the case of, the color whose chromaticity is within the above preferred range) can be emitted to the rear.

[0034]

According to the present invention, in a vehicular lamp for irradiating light from a light source toward a rear vehicle through a coloring filter, the coloring filter has a vehicle exterior side or a transparent substrate on the vehicle exterior side. With holograms arranged,
The hologram reflects a predetermined pattern recorded in the hologram toward the rear vehicle by external light outside the vehicle.

Therefore, when the vehicular lamp is not lit, the pattern is visually recognized by the driver of the following vehicle by the external light and the hologram. However, when the vehicular lamp is turned on, the light from the light source passes through the hologram and becomes higher than the brightness of the pattern formed by the external light and the hologram, so that this pattern is almost erased and the same operation as the conventional lamp is achieved. Therefore, it is possible to provide a vehicular lamp having a high design property without impairing safety.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing an example of a basic configuration of a vehicle lighting device of the present invention.

FIG. 2 is a graph showing vertical transmission characteristics of the red filter in FIG.

FIG. 3 is a graph showing vertical transmission characteristics of the hologram in FIG.

FIG. 4 is a front view showing an example of a pattern displayed by external light when viewed from the rear of the vehicle according to the present invention.

FIG. 5 is a conceptual diagram showing another example of the basic configuration of the vehicular lamp of the present invention.

FIG. 6 is a conceptual diagram showing another example of the basic configuration of the vehicular lamp of the present invention.

FIG. 7 is a conceptual diagram showing another example of the basic configuration of the vehicular lamp of the present invention.

FIG. 8 is a conceptual diagram showing another example of the basic configuration of the vehicle lamp of the present invention.

[Explanation of symbols]

 1: Rear glass 2: Black ceramic concealing layer 3: Synthetic resin frame 4: Color filter 5, 50: Hologram 6: Rear parcel shelf 7: Trunk lid 8: Car body 9: Transparent substrate 10: Lamp 11: Reflector 12, 120, 121: Case 13: Display pattern by external light

Claims (7)

[Claims] 1. A vehicle lamp for irradiating light from a light source toward a rear vehicle through a coloring filter, wherein a predetermined pattern is recorded on the outside of the coloring filter, and the outside of the coloring filter is outside. Alternatively, it has a hologram arranged on a transparent substrate, and the hologram reflects and diffracts external light outside the vehicle in a backward vehicle direction as a recorded predetermined pattern, and transmits light from the light source when the light source is turned on. A vehicle lamp characterized by being a hologram. 2. The hologram diffraction characteristic is characterized in that when the light source is turned on, the chromaticity of a mixed light of a transmitted light from the light source and a diffracted light by the hologram is y ≦ 0..0 using a chromaticity coordinate of JIS-Z8701. 3. The vehicle lamp according to claim 1, wherein 335 and z ≦ 0.008. 3. The diffraction characteristic of the hologram is such that when the light source is turned on, the chromaticity of the mixed light of the transmitted light from the light source and the diffracted light by the hologram is y ≦ 0.33 in the CIE (1931) standard color system. The vehicular lamp according to claim 1, wherein y≤0.98-x. 4. The vehicle lamp according to claim 1, wherein the hologram is a reflection hologram. 5. The vehicle lamp according to claim 4, wherein the hologram is a reflective hologram that reflects a color different from that of the coloring filter. 6. The vehicle lamp according to claim 4, wherein the hologram is a reflection type hologram that reflects sunlight. 7. The vehicular lamp according to claim 4, wherein the hologram is a reflection hologram which is a reflection hologram which reflects the light of a subsequent headlamp.