JP2788705B2 - Automotive high mount stop lamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high mount stop lamp (hereinafter abbreviated as HMSL) used for vehicles such as automobiles, and more particularly to an HMSL using a hologram.

[0002]

2. Description of the Related Art An HMSL of an automobile is effective in making a following vehicle clearly confirm a brake. In recent years, an HMSL provided in a cabin of an automobile and displayed through a rear window glass is provided. Has been proposed. Recently, a hologram using a hologram has been proposed in this type of HMSL in order to enhance the effect of confirming the brake on a following vehicle. For example, the one proposed by the present applicant in Japanese Patent Application Laid-Open No. 3-65448 has a hologram in which a hologram image is recorded is provided on a rear window glass or the like of an automobile, and a reproduction light source is opposed to the hologram. By irradiating the hologram with the reproduction light emitted from the reproduction light source, the hologram image is reproduced toward the rear of the automobile so as to be visually recognized by a following vehicle. In this HMSL, a lens step image used in the conventional HMSL is recorded on a hologram, and if red light is used as reproduction light, a red lens step image can be visually recognized from a succeeding vehicle, which is effectively used as the HMSL. Can work.

[0003]

By the way, this HMS
In L, paste the hologram on the rear window glass,
Since the reproduction light source is disposed facing the hologram, when the HMSL is mounted on a vehicle, the man-hour for attaching the hologram to the rear window glass and the optical axis center are aligned with the center of the hologram. The number of man-hours for disposing the reproduction light source is required, and there is a problem that the man-hours for installing the HMSL are complicated. Also, when the reproduction light source is installed on the rear parcel shelf of a car, etc.,
A slight distance occurs between the reproduction light source and the hologram, and the light from the reproduction light source irradiates the hologram attached to the rear window glass in an inclined state. At this time, although the reproduction light source is designed to irradiate the hologram with parallel light, it is actually difficult to make it completely parallel light, and part of the light is diffused or converged from the reproduction light source. Be injected. For this reason, some of the light from the reproduction light source is not irradiated to the hologram, so that the light from the reproduction light source cannot be used effectively, and the luminance of the reproduced hologram image is reduced. Due to the inclination, it is difficult to irradiate the hologram with uniform light, and there is a possibility that the hologram image will have uneven light quantity. SUMMARY OF THE INVENTION It is an object of the present invention to provide an HMSL in which the number of man-hours required for mounting an HMSL using a hologram on an automobile is reduced and a hologram image with a uniform light amount can be reproduced.

[0004]

According to the HMSL of the present invention, in a configuration for reproducing a hologram image by irradiating a hologram with light from a reproduction light source, the hologram is formed integrally with the reproduction light source, and the surface of the hologram is reproduced by the reproduction light source. And the optical axis is oriented substantially perpendicular to the optical axis of

[0005]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view of a rear window glass portion of an automobile equipped with an HMSL according to a first embodiment of the present invention, as viewed from the back, and FIG. 2 is an enlarged sectional view taken along line AA of FIG. In these figures, the HMSL 2 is mounted on the inner surface at a position above the rear parcel shelf 3 in the interior of the vehicle and along the lower edge of the central portion of the inner surface of the rear window glass 1. The HMSL 2 is composed of a hologram 4 and a reproduction light source 5 as shown in a partially exploded perspective view of FIG. 3, and the hologram 4 has a base made of a transparent resin although its detailed description is omitted. A photosensitive layer is formed, and a general HMSL lens step is photographed on the photosensitive layer by a holographic technique and visualized. This hologram 4 is formed in a horizontally elongated band shape.

On the other hand, the reproduction light source 5 includes a funnel-shaped body 11 having a horizontally elongated opening at the front corresponding to the shape of the hologram 4, and a red filter 12 attached to the front opening of the body 11. Constitute the housing. Here, the groove 11 is formed over the entire periphery of the opening edge of the body 11.
is formed, the peripheral portion 12a of the red filter 12 is inserted into the concave groove 11a, and lances 12b protruding at a plurality of locations of the filter peripheral portion 12a are fitted into holes 11b formed on the outer surface of the concave groove 11a. Then, both are integrated.
At this time, the front of the red filter 12 is connected to a light bulb 14 to be described later.
And the light emitted from the reflector 16 is substantially perpendicular to the center of the optical axis. The body 11
A light bulb insertion hole 13 is formed on one side of the body. A socket 15 supporting a light bulb 14 is fitted into the light bulb insertion hole 13, and the light bulb 14 is arranged at a required position in the body 11. The back surface of the body 11 has a shape close to a paraboloid of revolution, and a metal film such as aluminum is formed on the inner surface of the body 11 to constitute a reflector 16, which reflects light from the bulb 14 toward the front opening. The hologram 4 is adhered and integrated on the surface of the red filter 12. In this case, as shown in FIG.
Is formed, and the hologram 4 is attached to the surface.

In the HMSL constructed as described above, a rectangular resin frame 6 is bonded to the front opening of the body 11,
Further, by bonding the resin frame 6 to the inner surface of the rear window glass 1 with an adhesive 7, the HMSL 2 is fixed to the rear window glass 1 in a state where the hologram 4 is almost in close contact with the inner surface of the rear window glass 1. . At this time, in this embodiment, the optical axis of the reproduction light source 5 is fixed so as to be perpendicular to the glass surface of the rear window glass 1.

According to this configuration, when the HMSL 2 is mounted on an automobile, the hologram 4 is already adhered to and integrated with the red filter 12 of the reproduction light source 5. At the same time, the hologram 4 is equipped, and the man-hour for the equipment is reduced. At this time, since the hologram 4 is integrated with the red filter 12 and the relative position with respect to the reproduction light source 5 has already been determined, there is no need to adjust the relative position relationship between the hologram 4 and the reproduction light source 5, and the mounting work is not required. Can be easily performed.

The HMSL2 equipped as described above
In the above, the light emitted from the light bulb 14 is directly or reflected by the reflector 16 and passes through the red filter 12 attached to the front opening, and is emitted as parallel light. Then, the red light is further incident on the hologram 4 and is diffracted by the hologram 4, thereby reproducing a hologram image toward the rear of the rear window glass 1, and a driver of a following vehicle observes the hologram image. And function as an HMSL.

Further, by arranging the surface of the red filter 12 substantially perpendicular to the optical axis of the reproduction light source 5, the surface of the hologram 4 integrated therewith is also substantially perpendicular to the optical axis of the reproduction light source 5. Almost all of the light emitted from the bulb 14 and the reflector 16 through the red filter 12 is incident on the hologram 4, and the hologram image is reproduced by these lights. A hologram image of high brightness used for the above can be obtained. Furthermore, since the surface of the hologram 4 is oriented substantially perpendicular to the optical axis of the reproduction light source 5, even when the light emitted through the red filter 12 is not perfectly parallel light, the hologram 4 has almost uniform brightness. As a result, the brightness of the reproduced hologram image can be made uniform.

On the other hand, in this embodiment, the stripes 20 are provided on the surface of the red filter 12 so that gaps are defined between the red filter 12 and the respective surfaces of the hologram 4. Red filter 1 when is turned on
Even if the resin constituting the hologram 4 or the hologram 4 is heated and bubbles are generated between the two, the bubbles can escape to the outside through the gaps between the irregularities 20 and the state in which the bubbles exist between the two can be prevented beforehand. be able to. This prevents the appearance of the HMSL from deteriorating in appearance, and prevents irregular reflection of light due to bubbles, thereby enabling good hologram image reproduction.

Here, when a hologram is to be attached to the surface of the red filter, as shown in FIG. 5A, a peripheral ridge 21 having a larger thickness around the red filter 12 is formed. A hologram may be attached to the ridge 21. In this case, a notch 21 a for venting air is formed in a part of the peripheral ridge 21. FIG. 5 (b)
As described above, the hologram 4 may be attached to the surface of the red filter 12 after random fine irregularities 22 are formed on the surface. In any case, the surrounding ridge 21
The gap between the red filter 12 and the hologram 4 is defined by the fine irregularities 22 and the air bubbles can be released to the outside by the gap as in the case of the striped irregularities 20.

When the HMSL is integrally mounted on the surface of the rear window glass as in the above embodiment, the optical axis of the reproduction light source is directed upward with respect to the rear of the automobile, so that it is diffracted by the hologram. It is conceivable that a part of the unexposed light is transmitted in a straight-ahead state, and when the following vehicle is a high vehicle such as a truck, the vehicle enters a driver's eyes and causes dazzling. However, according to the study of the present inventors,
When considering the slope of a sloping road on a road on which a car can run, including a mountain road, it is sufficient to consider about 28 degrees as the maximum slope, so even if there is some margin, as shown in FIG. If the transmitted light is within an angle range of about 45 degrees vertically from the vertical position of the car toward the rear of the car,
Even if the following vehicle is a high vehicle such as a truck, there is almost no danger of dazzling the driver of the following vehicle. Therefore, the inclination angle of the rear window glass with respect to the horizontal plane is 4
There is no problem if it is applied to a car having a temperature of 5 degrees or less as it is.

Here, the HMSL is arranged so that the hologram is in close contact with the rear window glass. However, as shown in FIG. The HMSL 2 may be provided so that the hologram 4 is tilted at a slight angle. In this configuration, the HMS
By using a resin frame 6A that is used when bonding L2 to the rear window glass 1 and that is formed in a tapered shape as a whole with different heights on opposite sides thereof,
SL2 is inclined at a required angle with respect to rear window glass 1. By inclining the HMSL 2 with respect to the rear window glass 1 in this manner, it becomes possible to perform equipment that satisfies the above-mentioned angle range of the HMSL irrespective of the inclination angle of the rear window glass 1. The degree of freedom of installing the HMSL on a vehicle having an inclination angle of 45 degrees or more with respect to the horizontal plane is improved.
In each of the above embodiments, a light bulb is used as the light source of the reproduction light source,
Although red light is emitted by the red filter, a red light bulb or a red light emitting diode may be used as a light source, and a white transparent plate may be used for the filter.

[0015]

As described above, according to the present invention, since the hologram is formed integrally with the reproduction light source, the number of hologram installation steps can be reduced as compared with the case where the hologram and the reproduction light source are individually provided, and It is possible to improve the assemblability of the HMSL, for example, it becomes unnecessary to adjust the position between the hologram and the reproduction light source. In addition, by directing the surface of the hologram substantially perpendicularly to the optical axis of the reproduction light source, all the light from the reproduction light source can be made incident on the hologram. There is an effect that a hologram image with high brightness can be reproduced to form a high-quality HMSL.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a vehicle equipped with the HMSL of the present invention as viewed from the rear.

FIG. 2 is an enlarged sectional view taken along the line AA of FIG.

FIG. 3 is a partially exploded perspective view in which a part of a reproduction light source is cut away.

FIG. 4 is an enlarged sectional view of a bonding portion between a red filter and a hologram.

FIG. 5 is a cross-sectional view showing another example of a bonded portion between a red filter and a hologram.

FIG. 6 is a diagram illustrating a relationship between a mounting angle of a reproduction light source and dazzling of a following vehicle.

FIG. 7 is a sectional view of another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rear window glass 2 HMSL (high mount stop lamp) 4 Hologram 5 Reproduction light source 6 Resin frame 11 Body 12 Red filter 14 Light bulb 16 Reflector

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B60Q 1/44 F21Q 1/00 G02B 5/32 G03H 1/22

Claims (1)

(57) [Claims] 1. A high-mount stop lamp for an automobile, comprising: a hologram arranged facing a rear window glass of the automobile; and a reproduction light source for irradiating the hologram with light and reproducing a hologram image behind the automobile. A high mount stop lamp for an automobile, wherein a hologram is formed integrally with the reproduction light source, and the hologram surface is oriented substantially perpendicular to an optical axis of the reproduction light source.