JPH058688A - Lamp fitting for vehicle - Google Patents

Abstract

PURPOSE:To provide lamp fittings for a vehicle able to prevent the direct irradiation of occupants with outer light beams diffracted from a transmission hologram and to use light beams generated in a light source efficiently. CONSTITUTION:A device is constructed with a light source 4, a transmission hologram 2 diffracting incident light beams 5 from the light source 4 rearward, and a transparent body 1 provided with recesses and projections of saw-toothed cross section and sticked on the room side inner surface of the hologram 2 so as that the saw-toothed recesses and projections are arranged in up to down direction. Thereby outer light beams diffracted by the transmission hologram are diffracted or reflected on the surfaces of recesses and projections of the transparent body upward and downward, and direct irradiation of occupants with light beams can be prevented. And the incident angle of light beams from the light source upon the transmission hologram can be reduced to improve the efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular lamp such as a brake light which informs a succeeding vehicle that a vehicle brake has been actuated or a turn signal indicating a turning direction of the vehicle.

[0002]

2. Description of the Related Art Conventionally, commonly used brake lights and turn signals have been lamps attached to bumpers, fenders, etc. at the rear of a vehicle, but recently, in order to improve visibility from the following vehicle, A large display (a so-called high-mount stop lamp, etc.) that consists of a light-emitting element, etc. near the rear window of the vehicle, for example, near the rear window.
The technology of providing the has been put to practical use.

As a conventional example of the brake light as described above, for example, there is one described in Japanese Utility Model Laid-Open No. 2-74243. FIG. 4 is a sectional view of the above conventional example. In FIG. 4, 2 is a transmissive hologram, 3 is a rear window glass, and the transmissive hologram 2 is attached to the rear window glass 3. A light source 4 is attached to, for example, a rear parcel of the vehicle. In the device of FIG. 4, when the driver operates the brake (specifically, depresses the brake pedal), the light source 4 is turned on in conjunction with the operation. The irradiation light 5 emitted from the light source 4 is diffracted by the transmission hologram 2 toward the following vehicle and emitted as diffracted light 51 toward the rear of the vehicle to inform the following vehicle that the brake is applied.

[0004]

However, in the conventional vehicular lamp as described above, the external light 6 such as sunlight is diffracted by the transmissive hologram 2 and radiated into the vehicle interior. There is a problem that occupants such as passengers and drivers are exposed to extraneous light. Further, due to layout restrictions such as the position of the light source 4 and the angle of the rear window glass 3, the incident angle of the irradiation light 5 with respect to the transmission hologram 2 becomes large. Therefore, a part of the irradiation light 5 is reflected by the surface of the transmissive hologram 2 to be reflected light 52, so that the diffracted light 51 radiated toward the rear of the vehicle becomes weaker by that amount, and therefore a light source with high brightness is required. There was a problem of becoming.

The present invention has been made in order to solve the problems of the prior art as described above, and it is possible to prevent external light from directly hitting an occupant and to effectively use the light generated by the light source. An object is to provide a vehicle lamp.

[0006]

In order to achieve the above object, the present invention is constructed as described in the claims. That is, in the present invention, a transparent body (for example, made of glass or plastic) having a sawtooth-shaped cross section is attached to the vehicle interior side surface of the transmission hologram so that the sawtooth-shaped irregularities are arranged vertically. .

[0007]

Function: Strong external light such as sunlight normally enters from above the vehicle. Therefore, if a transparent body having a sawtooth-shaped cross section is attached to the surface of the transmissive hologram inside the vehicle so that the sawtooth-shaped concavities and convexities are aligned in the vertical direction, the external light diffracted by the transmissive hologram is reflected on the surface. The uneven surface of the attached transparent body is not diffracted or reflected in the vertical direction, and is not directly irradiated in the direction of the occupant. In addition, the light emitted from the light source is also reflected on the surface of the uneven surface of the transparent body, and the angle of incidence on the transmissive hologram is reduced. Therefore, the loss due to the surface reflection is reduced, and the diffracted light emitted toward the rear of the vehicle is increased, so that the efficiency is improved.

[0008]

1 and 2 are views showing an embodiment of the present invention. FIG. 1 is a sectional view and FIG. 2 is a perspective view. First, the structure will be described. Reference numeral 1 denotes a transparent body having a saw-toothed concavo-convex cross-section, and the saw-toothed concavo-convex is affixed to the surface of the transmission hologram 2 on the vehicle interior side so as to be vertically aligned. 2 is a transmissive hologram mounted inside the rear window glass, 4 is a light source, 5 is irradiation light emitted from the light source 4, 6 is external light, 8 is an uneven upper surface of the transparent body 1, and 9 is a transparent body. It is the lower surface of the unevenness of 1.

Next, the operation will be described. The irradiation light 5 of the light source 4 is reflected by the upper surface 8 of the uneven surface of the transparent body 1 and enters the transmission hologram 2 at a small incident angle. Therefore, the loss due to the surface reflection of the transmission hologram 2 is reduced, and most of the irradiation light 5 is diffracted and emitted as diffracted light 51 toward the rear of the vehicle. External light 6 incident from above is diffracted by the transmission hologram 2 and then reflected downward by the uneven lower surface 9 of the transparent body 1, or is diffracted inside the transparent body and bent upward. Therefore, the extraneous light does not shine directly in the direction of the occupant.

When the present invention is applied to a brake light,
The light source 4 is turned on in association with the driver's brake operation, and when the present invention is applied to a direction indicator,
For example, a hologram having an arrow shape may be provided at both ends of the rear window.

Next, FIG. 2 is a sectional view of another embodiment of the present invention. In this embodiment, a sheet 7 for preventing dust is added to the embodiment shown in FIG. The sheet 7 is formed of, for example, soft plastic, and has a surface on the transparent body 1 side corresponding to the irregularities of the transparent body 1 and a flat surface on the vehicle interior side. By providing such a dust-preventing sheet 7, it is possible to prevent dust from accumulating in the concave portion of the transparent body 1.

[0012]

As described above, according to the present invention, the transparent body having the sawtooth-shaped irregularities in cross section is attached to the vehicle interior side surface of the transmission hologram so that the sawtooth-shaped irregularities are arranged vertically. As a result, the external light diffracted by the transmission hologram is vertically diffracted or reflected by the uneven surface of the transparent body, and is not directly reflected in the direction of the occupant. In addition, the light emitted from the light source is also reflected on the uneven surface of the transparent body, and the incident angle to the transmission hologram becomes small, so the loss due to surface reflection is reduced and the diffracted light emitted to the rear of the vehicle is increased, so that the efficiency is improved. Is improved.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a perspective view of an embodiment of the present invention.

FIG. 3 is a sectional view of another embodiment of the present invention.

FIG. 4 is a cross-sectional view of an example of a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Transparent body 2 ... Transmissive hologram 3 ... Rear window glass 4 ... Light source 5 ... Light emitted from light source 4 ... External light 7 ... Dust prevention sheet 8 ... Uneven surface of transparent body 9 ... Transparent body Uneven surface 51, 61 ... Diffracted light 52 ... Reflected light

Claims (1)

Claim: What is claimed is: 1. A light source, a transmissive hologram for diffracting light incident from the light source to the rear of the vehicle, and an inner side of the transmissive hologram such that sawtooth-shaped irregularities are arranged vertically. A vehicular lamp, comprising: a transparent body having a saw-tooth-shaped cross section attached to a surface thereof.