JPH0939652A - Vehicular warning lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular warning lamp capable of reducing the extent of pseudo-lighting generated due to the back reflection of external light. SOLUTION: This warning lamp is constituted so that the first hologram 20 for diffracting light emitted from a light emitting means below rear glass 1 toward a succeeding vehicle is provided at the rear glass 1 via the second hologram 11 for diffracting external light incident on the first hologram 20 in case of the absence of the second hologram 11, and keeping the pseudo-light emission of the light emitting means visible to the succeeding vehicle.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a vehicle warning light. In particular, the present invention relates to a vehicle warning light that 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 notifying such information to the vehicle behind when the traveling direction is changed, it has been 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).

Conventional high mount stop lamps include those in which a light source is placed on the rear parcel shelf in the rear of the vehicle, those which are attached to the rear glass with a suction cup, and those in which the light source is linearly arranged in the rear spoiler portion. The rear parcel shelf type occupies most of the space above the rear parcel shelf, while the rear parcel shelf type occupies part of the rear glass, obstructing part of the rear view of the vehicle driver. I will end up.

In order to solve the above-mentioned problems, a light source is incorporated in a vehicle body to illuminate the rear glass with warning information light to be displayed, and a hologram is arranged on the rear glass. A high mount stop lamp has been proposed that diffracts light from a light source toward the rear of the vehicle. According to this, it is possible to obtain a warning lamp having high visibility and high position without hindering the rear view of the driver. Also, as a warning light, when it does not work,
The driver and the driver of the vehicle behind the vehicle have a clear field of view close to a normal rear window.

[0006]

FIG. 2 is a schematic sectional view of a conventional high mount stop lamp using a hologram. A hologram 2 is provided on the inside of a rear glass 1 of an automobile, and a lamp 4 serving as a light source is housed in a case (not shown) on a rear parcel shelf (not shown). A wear-resistant and water-resistant protective layer 13 is usually attached to the inside of the hologram 2 for protecting the hologram. A reflector 5 is arranged on the rear surface of the lamp 4, and a red filter 3 is arranged on the front surface.

The main light 6 emitted from the lamp 4 becomes light 7 directly or reflected by the reflection plate 5 and transmitted through the red filter 3 and diffracted by the hologram 2, and a viewer 10 such as a driver of the following vehicle. Will be guided in the direction of.

Further, as an application example of a high mount stop lamp, Japanese Patent Publication No. 1-502465 discloses an operation in which two holograms are used and external light is reflected forward by a hologram member to see a rear-view mirror. It is suggested to keep it out of the eyes of the person.

On the other hand, in the high mount stop lamp having the structure shown in FIG. 2, when the sunlight 2 in the daytime or the outside light 8 of the streetlight like a spotlight at night illuminates the portion of the hologram 2, at a predetermined angle. The light passes through the hologram 2 and is reflected at the interface between the protective layer 13 and the air and / or at the interface between the hologram 2 and the protective layer 13, and the light is further diffracted by the hologram 2 to become unnecessary light 9. Therefore, it may be visually recognized by a viewer 10 such as a driver of a rear vehicle, so-called pseudo lighting may occur, and the light 6 from the lamp 4 may be mistaken for the regular light 7 diffracted by the hologram 2.

The problem of such unnecessary light similarly exists in the high mount stop lamp having the configuration disclosed in the above publication, and in this publication, no consideration is given to so-called pseudo lighting of external light to a following vehicle or the like. Was not done.

It is an object of the present invention to newly provide a vehicle warning light that solves the above-mentioned problems of the prior art.

[0012]

According to the present invention, there is provided a light emitting means for generating information to be displayed as light, and a first light emitting means arranged inside a rear glass of a vehicle for diffracting the light toward the rear of the vehicle. A vehicle warning light comprising at least a hologram, comprising a second hologram between the first hologram and the rear glass, wherein the second hologram is the first hologram if the second hologram is not present. A warning light for a vehicle, which is a hologram that is a hologram that is incident on a hologram and that diffracts external light that makes the pseudo light emission of the light emitting means visible behind the vehicle.

[0013]

FIG. 1 is a schematic sectional view showing the basic structure of the present invention. In FIG. 1, 1 is a rear glass, 2
0 is a first hologram, 3 is a red filter, 4 is a lamp, 5 is a reflector, 6 is light from the lamp, 7 is light diffracted by the first hologram 20, 8 is external light, 10 is light from the following vehicle. A viewer such as a driver, 11 is a second hologram, 12 is light diffracted by the second hologram 11, and 13 is a wear-resistant and water-resistant protective layer for protecting the hologram.

A rear parcel shelf (not shown) below the rear glass 1 is provided with a light emitting means in which a lamp 4, a reflector 5 and a red filter 3 are housed in a case (not shown). Light including the braking information and the like is emitted toward the first hologram 20 from the light emitting means in synchronization with the braking operation of the driver. In this way, the light applied to the first hologram 20 becomes the light 7 diffracted toward the following vehicle, and the warning information is transmitted backward.

As the rear glass 1, a single glass plate, a laminated glass, a transparent plate made of synthetic resin or the like is used, and further, these may be colored, or a heat ray reflecting film or the like may be provided on the surface. However, it is preferable that the function as a stop lamp is not hindered.

In this example, the first hologram 20 has a thickness of 2
This is a Lippmann type transmission hologram composed of an acrylic photopolymer of 0 μm, length 40 mm, width 200 mm, and its diffraction characteristics have a center wavelength of 620 nm and a half width of 50 n
m, the one produced by exposing with parallel light having a diffraction efficiency of 70% and diverging light was used.

The second hologram 11 is made of the same material as the first hologram 20, and is a Lippmann type reflection hologram whose diffraction characteristics have a central wavelength of 620 nm, a half-value width of 50 nm, and a parallel light with a diffraction efficiency of 90%. Although it was produced by exposure to light, it is preferable that it has higher efficiency and a wider half width.

The second hologram 11 is attached to the inside of the rear glass 1 with an acrylic adhesive (not shown),
Further, a first hologram 20 is laminated thereon with an acrylic adhesive material (not shown), and the first hologram 20
In order to protect the second hologram 11, a polyethylene terephthalate film 13 serving as a protective layer was laminated on the second hologram 11 with an acrylic adhesive (not shown).

The first hologram 20 and the second hologram 11 usually have a thickness of several μm to several tens of μm and an appropriate area, and if they have a light diffracting function, they are embossed type,
Rainbow type and other holograms can be widely used. As the hologram material, various photosensitive materials such as dichromated gelatin, photoresist, silver salt, and polyvinylcarbazole-based photopolymer can be used, but those having transparency are preferable.

The incident angles and diffraction angles of the first hologram 20 and the second hologram 11 are determined by the installation angle of the rear glass 1, the position and angle of the light emitting means, and the light distribution characteristics.
Furthermore, it can be appropriately changed depending on the shape of the vehicle, the shape of the light emitting means, the mounting position, and the design.

Light 6 from the lamp of the second hologram 11
The diffraction characteristics for light having a wavelength equal to the wavelength are set as follows. That is, the second hologram 11
Is a reflection diffraction (corresponding to light 12 in FIG. 1) or a different angle for direct transmission so that light having a wavelength equal to the wavelength of light 6 from the lamp incident at an angle of θ defined below is not directly transmitted. It has a diffraction characteristic of being transmitted and diffracted at.

In the above θ, when the second hologram is not present, the light reflected from the outside light 8 at the interface between the protective layer 13 and the air and / or the interface between the first hologram 20 and the protective layer 13 is the first. The angle of incidence at the position where the second hologram is supposed to be arranged is equal to the angle of incidence when the light 6 from the lamp becomes equal to the angle of incidence at the first hologram.

In the above, "equal" with respect to wavelength,
The expression "equal" is used for the angle of incidence. A hologram generally has a certain wavelength width at a diffraction peak in its diffraction spectrum as a diffraction characteristic. Light having a wavelength included in this width can be sufficiently diffracted by the hologram. Also, regarding the incident angle and the diffraction angle of the wavelength, when the diffracted wavelength has a certain width, the incident angle and the diffraction angle have a certain width. Therefore, in the present invention, the above-mentioned "equal" means that a slight shift in wavelength or incident angle is included depending on the characteristics of the hologram.

As the lamp 4 in this example, two 12 lamps are used.
V18W tungsten lamp is used, wavelength 600
A red filter 3, which is a high-pass filter having a transmittance of 50% in nm, is arranged between the first hologram 20 and the lamp 4. The lamp is not particularly limited as long as sufficient brightness can be obtained, such as a halogen lamp and an LED in addition to the above tungsten lamp.

Further, although the stop lamp is arranged in the lower part of the rear glass in this example, it may be provided in the upper part of the rear glass without being restricted by this.

The warning information to be displayed can be exemplified by a stop lamp indicating a braking operation, a backward movement, a direction indicator, etc., which is appropriately selected according to its use. In particular, when the braking operation is transmitted backward as the warning information, the peak wavelength of the intensity may be set in the red region that meets the safety standard by using the wavelength selectivity of the hologram. Further, the first hologram 20 may be a hologram in which a plurality of transmissive holograms having different light diffracting functions are laminated, and is formed by performing multiple exposure with a light having different properties on one hologram material. It may be.

Further, the second hologram 11 is referred to as the first hologram 20 when the external light 8 is incident on the rear glass at the position where the first hologram 20 is arranged and when the second hologram 11 is not present. Not only is the light diffracted as light reflected at the interface with the protective layer 13 and / or the interface between the protective layer 13 and the air diffracted, but at the same time the second hologram 11 is different from the light diffracted by the first hologram 20. It may have a function of a reflection hologram that diffracts the color external light 8 and displays a certain pattern to the viewer 10.

In order to have this function, a pattern of an object or the like may be formed by exposing one second hologram 11 by multiple exposure, and the second hologram 11 may be formed as a reflection pattern for a display pattern. A laminated hologram including a hologram may be used. In this case, when the lamp 4 is not lit, the display pattern is recognized by the viewer 10 by the external light 8 and the display pattern is substantially erased when the lamp 4 is lit, so that a high mount stop lamp using a hologram with a high design is used. Can be configured.

[0029]

According to the present invention, when external light is incident on the rear glass at the position where the first hologram is arranged, the interface between the protective layer and the air and / or the first hologram and the protective layer. By arranging the second hologram that diffracts the light that becomes the light reflected at the interface with and, so-called pseudo lighting is reduced, and it is possible to prevent a driver or the like of a vehicle behind from misidentifying. Furthermore, since the first hologram and the second hologram appear almost transparent to the viewer of the following vehicle when the lamp is not lit, a high mount stop that uses a hologram with a high level of safety and design in terms of alerting attention. You can configure the lamp.

In particular, if a display pattern reflecting and diffracted by external light is formed on the second hologram, a high mount stop lamp using the hologram with higher safety and design can be realized.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing a basic configuration of a vehicle warning light according to the present invention.

FIG. 2 is a schematic sectional view showing a configuration of a conventional hologram high mount stop lamp.

[Explanation of symbols]

 1: Rear glass 2: Hologram 3: Red filter 4: Lamp 5: Reflector 6: Light from lamp 7: Light diffracted by the first hologram 8: External light 9: Unwanted light 10: Viewer of the following vehicle 11: 2nd hologram 12: Light diffracted by the 2nd hologram 13: Protective layer 20: 1st hologram

Claims (4)

[Claims] 1. A vehicle comprising at least a light emitting means for generating information to be displayed as light and a first hologram arranged inside a rear glass of the vehicle to diffract the light toward the rear of the vehicle. A warning light for use, comprising a second hologram between the first hologram and the rear glass, the second hologram being the first hologram if there is no second hologram.
The warning light for a vehicle, which is a hologram that diffracts external light that is incident on the hologram and that makes the pseudo light emission of the light emitting means visible behind the vehicle. 2. A vehicle warning lamp according to claim 1, wherein a wear-resistant and water-resistant protective layer is laminated on the surface of the first hologram opposite to the rear glass. 3. The second hologram has an incident angle θ shown below.
3. The vehicle warning lamp according to claim 2, wherein the hologram is a hologram that diffracts light having a wavelength equal to that of the light 6 incident from the lamp. However, θ is the light reflected at the interface between the protective layer and the air and / or the interface between the first hologram and the protective layer among the external light when the second hologram is absent, and the second hologram is arranged. The angle of incidence on the supposed position is equal to the angle of incidence of the light from the lamp on the first hologram. 4. The vehicle warning lamp according to claim 1, 2 or 3, wherein the second hologram is a hologram that diffracts a display pattern by external light.