JPH0730143U - High mount stop lamp for vehicle - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a high mount stop lamp that can warn the following vehicle that it is in a high beam state. [Structure] The hologram 1 is arranged on a rear glass 14 of a vehicle, and when a light beam from a light source 2 synchronized with a brake lamp is incident on the hologram 1, the light beam is diffracted rearward to function as a high mount stop lamp. When it is a high beam, it also has a reflection function that reflects the high beam and warns the following vehicle.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a high mount stop lamp for a vehicle.

[0002]

[Prior art]

 Conventionally, in vehicles such as automobiles, the method of urging the vehicle behind to pay attention when operating the brakes, reversing, changing the direction of travel, etc. is usually to turn on the brake lamp or the reverse light located above the bumper. is there. However, in the case of a brake lamp located above a normal bumper, when it snows, the brake lamp will be hidden by the snow and will not be visible to the vehicles behind it. It is difficult to distinguish the lighting display of the above-mentioned brake lamp of the front passenger car, and the brake operation state of the front passenger car is clearly distinguished because the side lights etc. light up at night. There was a safety issue because it would be difficult.

In order to solve such a problem, it has been proposed and put into practical use that the light emitting portion of the brake lamp is placed at a relatively high position near the rear glass (hereinafter referred to as a high mount stop lamp).

This is because the light emitting portion as a warning light is located at a relatively high position, so that it has an advantage that it can be easily seen from a vehicle behind, and the safety is high because the light emitting portion is not hidden by the snow even during snowfall. It is very useful because of its advantage.

As the high-mount stop lamp, there are a light source placed on a rear par shelf in the rear of a passenger car, a light source mounted on a rear glass with a suction cup, a linear point light source arranged on a rear spoiler portion, and the like. . The type placed on the rear par shelf occupies the space above the rear par shelf, and the type mounted on the rear glass occupies a part of the rear glass, which hinders the rear view of the vehicle driver. Further, in any of these high mount stop lamps, in order to allow various designs for the display and display of various information such as characters, the area of the light emitting portion is increased. There is a high demand to do so. However, if the area of the light emitting portion is made too large, the rear view of the driver of the vehicle is further hindered, and there is a problem that the light emitting portion cannot be made so large in reality.

Therefore, recently, a holographic high-mount stop lamp including a light source that generates information to be displayed as a light beam and a hologram that diffracts the light beam toward the rear of the vehicle has been proposed. According to this, it is possible to obtain a warning lamp with high visibility and high position without obstructing the rear view of the driver. In addition, as a warning light, when it does not operate, the driver and the driver of the vehicle behind can obtain a clear view close to that of a normal rear glass.

[0007]

[Problems to be solved by the device]

 As a high mount stop lamp using the hologram described above, in JP-A-1-502465, a hologram for diffracting a light beam from a light source to the rear of the vehicle is provided on a rear glass, and sunlight is irradiated toward the rear glass. A stop lamp provided with a reflection hologram on the rear glass is disclosed so that the sunlight does not penetrate into the vehicle when it strikes.

However, although the stop lamp disclosed in this publication makes use of the characteristics of the hologram, it does not prevent sunlight from penetrating into the vehicle, but it emits light from another vehicle. It had no function with respect to the emitted light.

That is, when the following vehicle is in the high beam state, the driver may feel the high beam of the following vehicle dazzling and may hinder the driving operation. Didn't.

[0010]

[Means for Solving the Problems]

 The present invention has been made to solve the above-mentioned problems, and it is a light source that generates information to be displayed as a light beam and a transmission diffraction light that is arranged on the rear glass of a vehicle and is directed toward the rear of the vehicle. In the vehicle high-mounted stop lamp, the hologram has a light transmitting function and a reflecting function for reflecting a high beam of a following vehicle toward the following vehicle. A high mount stop lamp for a vehicle is provided.

[0011]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a vehicle high mount stop lamp according to the present invention. Hologram 1 is an acrylic photopolymer having a thickness of 40 μm, a length of 70 mm, and a width of 170 mm, and is a Lippmann type hologram in which multiple exposure is performed so as to have both a Lippmann type transmission function and a reflection function. This hologram 1 is arranged on the rear glass 14 of the vehicle, and when a light beam from the light source 2 synchronized with the brake lamp is incident, it diffracts the light beam backwards and functions as a high mount stop lamp. When it is a high beam, it also has a reflection function that reflects the high beam and warns the following vehicles.

The hologram usually has a thickness of about several tens of μm and an appropriate area, and if it has a light diffracting function, an embossed type, a rainbow type, and other holograms can be widely used. As the hologram material, various photosensitizers such as gelatin dichromate, photoresists, silver salts, and polyvinylcapazole-based photopolymers can be used.

Further, the transmission diffraction angle of the hologram 1 is determined by the installation angle of the rear glass and the incident angle of the light beam from the light source 2, and the peak wavelength of the diffraction intensity of the hologram is almost the same as the peak wavelength of the intensity of the light source 2. Matching is preferable for improving efficiency. In particular, when the information emitted from the light source 2 is vehicle stop information, the wavelength selectivity of the hologram may be used so that the peak wavelength of the intensity comes in the red region that meets the safety standard.

Regarding the reflection function, the reflection diffraction angle of the hologram is determined by the installation angle of the rear glass and the incident angle of the high beam of the follower vehicle 3, and the wavelength of the reflection diffraction light depends on the hologram manufacturing conditions (wavelength of laser used, exposure time). Angle etc.). Further, when it is desired to reflect a graphic or character (LIGHT DOWN, etc.) so as to be displayed, UV exposure can be easily performed by using a mask of that shape before hologram exposure.

FIG. 2 shows an exposure optical system for the multiple exposure hologram used in this embodiment. The transmission function for the stop lamp is obtained by exposing the hologram recording material 13 with the Kr laser 7, and the reflection function for the reflection warning is obtained by exposing the hologram recording material 13 with the Ar laser 8. In this embodiment, after passing through the reflecting mirror and the filter, the collimating lens 12 is used to expose the parallel light. However, the hologram recording material 13 should be provided with diffused light to impart power to the transmitted diffracted light and the reflected diffracted light. Is also possible.

Although such a hologram may be provided separately from the rear glass, it is preferably attached to the rear glass of a vehicle for use because of its simple structure. Particularly from the viewpoint of hologram protection, a polyethylene terephthalate film or the like is used. It is preferable that the hologram is covered with and a protective film is provided, or the rear glass is used as a laminated glass and sealed inside.

In this case, the laminated glass is obtained by laminating and adhering a synthetic resin film such as a polyvinyl butyral film and a polyurethane film on at least one piece of glass. An example of the form is a glass plate / synthetic resin. Membrane, glass plate / synthetic resin film / glass plate, glass plate / synthetic resin film / glass plate / synthetic resin film, glass plate / synthetic resin film / synthetic resin film, etc. The hologram may be enclosed in the boundary between these glass plates or the synthetic resin film or in the synthetic resin film. The glass plate on which the hologram is mounted may be colored or may be provided with a heat ray reflective film or the like on the surface.

Further, in order to protect the hologram from ultraviolet rays and the like, it is preferable to attach an ultraviolet protective film to the surface of the glass. Furthermore, in order to reduce the reflection of extra light and increase the contrast, an antireflection film can be attached to the viewing side of the display.

Further, although the light source is provided on the lower portion of the rear glass in this embodiment, the light source may be provided on the upper portion of the rear glass without being restricted by this.

[0021]

[Effect of device]

 According to the present invention, the hologram is arranged on the rear glass of the vehicle so that the vehicle behind is notified of the stopping operation of the vehicle, and further, the hologram for reflecting and diffracting the high beam of the following vehicle is arranged on the rear glass. , It is possible to obtain a high mount stop lamp that can reduce the high beam of the following vehicle from passing through the vehicle and warn the following vehicle that it is in a high beam state while in front. .

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a vehicle high-mount stop lamp according to the present invention.

FIG. 2 is a conceptual diagram showing a hologram exposure optical system in the present invention.

[Explanation of symbols]

 1: Hologram 2: Light source 3: Following car 4: Following car High beam 5: High beam reflected light 6: Stop lamp light 7: Kr laser 8: Ar laser 9: Variable beam splitter 10: Mirror 11: Spatial filter 12: Collimator lens 13: Holographic recording material 14: Rear glass

Claims (3)

[Scope of utility model registration request] 1. A high mount stop lamp for a vehicle, comprising at least a light source for generating information to be displayed as a light ray, and a hologram arranged on a rear glass of the vehicle for transmitting and diffracting the light ray toward the rear of the vehicle. The high mount stop lamp for a vehicle, wherein the hologram has a function of transmitting the light rays and a function of reflecting a high beam of a following vehicle toward the following vehicle. 2. The high mount stop lamp for a vehicle according to claim 1, wherein the hologram has a transmission function and a reflection function which are multiple-exposed on one hologram recording material. 3. The high mount stop lamp for a vehicle according to claim 1, wherein the hologram is a lamination of a transmission hologram and a reflection hologram.