JPH06305359A - High mount stop lamp for automobile - Google Patents

Abstract

PURPOSE:To improve nice external appearance and regenerate a bright hologram image so as to fill a standard, in a high mount stop lamp utilizing hologram extendingly provided on the rear window glass of an automobile. CONSTITUTION:Hologram 3 extendingly provided on the rear window glass 2 face of an automobile is formed smaller than the width measure of an opening part 11c for irradiating the light of a regenerated light source 10, the regenerated light source 10 is constituted into a converging light source, and the device is constituted so that the light from the regenerated light source 10 is irradiated to the hologram 3 in the condition of smaller width measure than the width measure of the opening part 11c. Nice external appearance of the automobile is improved by shortening the width measure of the hologram 3, meanwhile, the light of high light quantity from a large opening part 11c is convergingly irradiated on the hologram 3 so as to regenerate a bright hologram image.

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 in a vehicle such as an automobile, and more particularly to an HMSL using a hologram.

[0002]

2. Description of the Related Art The HMSL of an automobile is effective in clearly confirming a brake to a succeeding vehicle, and in recent years, an HMSL in which a rear windshield of an automobile is displayed for display is proposed. However, if the HMSL is provided at the rear window position, it may limit the rear view of the driver of the own vehicle. Therefore, recently, a hologram is proposed. For example, the one previously proposed by the present applicant in Japanese Patent Laid-Open No. 3-65448 is a reproduction light source provided with a hologram on which a hologram image is recorded on a rear window glass of an automobile and facing the hologram. The reproduced hologram image can be viewed from the rear of the vehicle by irradiating the reproduced light from the vehicle. In this HMSL, if a lens step image used in a conventional HMSL is recorded in a hologram and red light is used as reproduction light, a red lens step image can be visually recognized from a following vehicle, which is effective as an HMSL. Can function.

For example, FIG. 12 is a perspective view showing a schematic structure thereof. A hologram 3 formed in a film shape is attached to an inner surface of a rear window glass 2 of an automobile, and a rear parcel shelf 4 facing the hologram 3. The reproduction light source 10 is arranged in the. By irradiating the hologram 3 with the reproduction light emitted from the reproduction light source 10, the hologram image is reproduced outside the rear window glass 2. With this configuration, the reproduction light source can be arranged without obstructing the rear view through the rear window glass of the driver, and the rear view can be widened.

[0004]

By the way, in the HMSL of such a system, the hologram 3 diffracts the light at an angle according to the angle of the incident light to generate a hologram image, so that the reproduction light source 10 emits the hologram image. It is necessary to control the incident angle of the light to a predetermined angle. Therefore, H shown in FIG.
In the MSL, the reproduction light source 10 is configured to emit parallel light, and is configured to irradiate light onto the hologram 3 at the same angle at any position. Therefore, the reproduction light source 1
The irradiation width of the parallel light from 0, that is, the opening of the reproduction light source has a dimension corresponding to the width dimension of the hologram 3. But,
In the reproduction light source 10 configured as described above, when the position with respect to the hologram 3 is displaced, the light from the reproduction light source 10 is displaced and applied to the hologram 3, and this displacement causes the hologram to be imaged over the entire surface. The reproduction is not performed, and a defect occurs in the hologram image, or the hologram image becomes dark.

Further, it is required to reduce the width of the hologram because of the appearance requirement. However, the area is reduced as the width of the hologram is reduced. The area is reduced, the total amount of light is reduced, and the generated hologram image becomes dark. As described above, if a part of the hologram image is lost or the hologram image becomes dark, there is a possibility that the standard of HMSL may not be satisfied. An object of the present invention is to provide an HMSL capable of reproducing a bright hologram image and satisfying the regulatory standards of the HMSL and improving the appearance.

[0006]

SUMMARY OF THE INVENTION The HMSL of the present invention comprises a hologram extended on the rear windshield surface of an automobile.
The width of the opening for light irradiation of the reproduction light source that emits light to this is formed smaller than that, and the reproduction light source is configured as a condensing light source so that the light from the reproduction light source is smaller than the width of the opening. The hologram is configured to be irradiated in a state of a small width dimension. Further, the hologram is composed of a plurality of subdivided holograms, and the incident light angle characteristics of each subdivided hologram are made different corresponding to the incident light angles.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a schematic configuration of a first embodiment of the HMSL of the present invention, and FIG. 2 is an enlarged sectional view taken along the line AA. In these figures, the HMSL 1 has a hologram 3 formed as a horizontally elongated film integrally attached to the inner surface of the rear window glass 2 mounted in the opening of the vehicle body along the lower edge of the central portion. ing. In this hologram 3, a photosensitive layer is formed on a base made of a transparent resin, and a general HMSL lens step is photographed on this photosensitive layer by a holography technique to visualize it. This hologram 3 is formed laterally in the shape of an elongated strip, and is adhered to the inner surface of the rear window glass 2 with a transparent adhesive (not shown).

A reproducing light source is arranged on the rear parcel shelf 4 at a position facing the hologram 3. This reproduction light source 10 has a partially disassembled structure as shown in FIG.
A funnel-shaped body 11, which is elongated in its entirety horizontally, and a red filter 12, which is attached to an opening 11c on the front surface of the body 11, constitute a housing. Here, a concave groove 11a is formed on the entire circumference of the opening edge of the body 11, a peripheral edge portion 12a of the red filter is inserted into the concave groove 11a, and lances projecting from a plurality of positions on the peripheral edge portion 12a of the red filter. 12b is fitted into a hole 11b formed on the outer surface of the concave groove 11a to integrate the two. Further, a light bulb insertion hole 13 is formed on one side surface of the body 11, 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. . On the inner surface of the body 11 located above the light bulb 14, a protector 16 made of a metal plate or the like is supported by a guide 17 extending on the inner surface of the body 11, and the body 11 is heated by the heat generated by the light bulb 14.
To prevent damage.

As shown schematically in FIG. 4, the rear surface of the body 11 has a parabolic cross section and an elliptical cross section in the vertical direction, and has a metal film such as aluminum on its inner surface. Is formed as a reflector 18, and the light from the light bulb 14 is reflected toward the opening 11c as parallel light in the horizontal direction and as light having a converging property in the vertical direction. Here, the horizontal dimension of the opening is equal to the horizontal dimension of the hologram 3, and the vertical dimension is larger than the vertical dimension of the hologram 3. Further, as shown in FIG. 3, a box-shaped portion 19 having a hollow interior is integrally formed on both outer side surfaces of the body 11 so as to project in both directions, and the outer surface of the box-shaped portion 19 has a front surface. The flange 20 is formed at a required angle with respect to the opening. This flange 20 has a body 11
The bolt insertion hole 21 for attaching the to the vehicle is opened.

The reproduction light source 10 having the above-described structure is internally provided in a rectangular hole formed in the vehicle body panel 5 of the rear parcel shelf 4, and as shown by a broken line in FIG. The flange 20 of the reproduction light source 10 is attached to the vehicle body panel 5 using the bolt 7 screwed into the hole, and the body 11 is attached to the vehicle body panel 5 in a state of being inclined rearward with respect to the horizontal plane. At this time, the red filter 12 at the opening of the reproduction light source faces the hologram 3 provided on the rear window glass 2 and is separated from the rear window glass 2 by some size. A decorative panel 6 for decorating the rear parcel shelf 4 is provided above the vehicle body panel 5.

According to the HMSL 1 having this structure, as shown in FIG. 2, the light emitted from the light bulb 14 is directly reflected by the reflector 18 or is collimated in the lateral direction and is condensed in the vertical direction. Light is transmitted through the red filters 12 attached to the openings 11c, and emitted from the reproduction light source 10 as red light. Then, this red light is projected on the hologram 3, and by passing through this hologram 3, it becomes possible to observe a red hologram image from the rear of the rear window glass 2, and it functions as an HMSL. At this time, since the reproduction light source 10 emits light having a converging property particularly in the vertical direction and irradiates the thin hologram having a small vertical width, the vertical width is larger than the vertical width of the hologram 3. Opening 11c
The hologram 3 can be irradiated with all the light emitted from the hologram 3. Thereby, although the vertical width of the hologram 3 is reduced for the purpose of appearance, the reproduced hologram image is bright because the light irradiation is performed with a high light amount, and the visibility is high. H that meets the criteria
MSL is possible.

Alternatively, as shown in FIG. 5, the light from the reproduction light source 10 may be once condensed and then radiated to the hologram 3 while being diffused again. However, in this case, the second focal position of the reflector 18 and the position of the hologram 3 are arranged so that the hologram is irradiated with the diffused light having a smaller vertical width than the vertical width of the opening of the reproduction light source 10. Settings are required to satisfy the relationship. Further, in this case, as shown in FIG. 6, a cylindrical condenser lens 22 having a vertical curvature is arranged in front of the second focal point of the elliptical reflector 18, and the once condensed light is reproduced. The hologram 3 may be irradiated with parallel light having a width smaller than the opening width of the hologram. In particular, in this case, since all the light reflected by the reflector 18 can be applied to the hologram 3 as parallel light, it is possible to compare with the case where the peripheral light is not applied to the hologram 3 as in the case of FIG. For example, even when the width dimension of the hologram 3 is further reduced, the reproduced hologram image can be made brighter.

Further, as shown in FIG. 7, the reproduction light source 10
The reflector 18 'is formed with parabolic cross-sectional shapes in the horizontal and vertical directions so that all light from the bulb is directed to the opening as parallel light, while the opening has a vertical curvature. The cylindrical condensing lens 23 having the above is arranged so that the light emitted from the reproducing light source is parallel in the horizontal direction, is once condensed in the vertical direction, and is then irradiated to the hologram 3 in a diffused state. You may. Also in this configuration, the same effect as that of the first embodiment can be obtained. Further, in this case, the hologram may be irradiated while being condensed by the condenser lens 23. However, in the case of irradiating the hologram 3 with the same amount of light, it is more advantageous to configure the reflector with an elliptical surface as shown in FIG. 6 in order to downsize the reproduction light source.

FIG. 9 is a perspective view of the second embodiment of the present invention. Although a condensing reproducing light source is used in the first embodiment, when such a reproducing light source is used, the angle of light incident on the hologram is slightly shifted. That is, FIG.
As shown in (a), since the light beam distant from the optical axis O of the reproduction light source has a large angle with respect to the optical axis, the incident light angle with respect to the hologram 3 is also in the plus and minus directions with respect to the original incident light angle of the hologram. Deviation angle + θ1, -θ
1 occurs. As described above, the hologram reproduces an image at a predetermined incident light angle with respect to a predetermined incident light angle. Therefore, if such a deviation of the incident light angle occurs, the efficiency of image reproduction is partially reduced, and There is a risk that the brightness of the image in the direction of the predetermined outgoing light angle is insufficient and the HMSL standard may not be satisfied. FIG. 9B is a characteristic diagram showing the relationship between the incident light angle and the image reproduction efficiency.

Therefore, in the second embodiment, as shown in FIG. 8, the hologram 3A is divided into a plurality of regions in the vertical direction. That is, as shown in a detailed view in FIG. 10, here, five holograms 31 which are extremely thin in the lateral direction are used.
A plurality of to 35 are arrayed in the vertical direction, and these are integrated to form one hologram 3. The incident light angles set from the characteristics of the respective subdivision holograms 31 to 35 correspond to the inclination of the light beam of the condensing reproduction light source, and the subdivision hologram 33 in the center is set to a predetermined incident light. The angle θ0 is set, and the incident light angles of the subdivided holograms 32, 34 and 31, 35 arranged above and below with this angle as the center are −θ1, + θ1, respectively in the minus and plus directions.
It is assumed that they are sequentially increased like −θ2 and + θ2. In order to form such a hologram, there is a method in which a plurality of holograms formed in advance with different incident light angles are subdivided, a pair of subdivided holograms are taken out from each hologram, and these are bonded and integrated.
Alternatively, there is a method in which a thin slit-shaped mask is used when one hologram is formed, and the mask is exposed sequentially while moving the mask and changing the incident light angle in sequence.

In any case, if this hologram 3A is used, when the condensing light is emitted from the reproduction light source 10, the optical axis O is applied to each of the plurality of subdivided holograms 31 to 35 constituting the hologram 3A. Since light is emitted at different incident angles with respect to the center, as a result, the respective subdivided holograms 31 to 35 have the best image reproduction efficiency at the same outgoing angle, and as a result, the hologram as a whole has a predetermined angle with respect to a predetermined angle. Highly efficient image reproduction is realized.
For this reason, the brightness of the reproduced hologram image becomes high, and it becomes possible to satisfy the HMSL standard. The first and second embodiments show an example in which the hologram has a small vertical width. However, in the case of a vertically long hologram having a small horizontal width, the reproduction light source has a light-collecting property in the horizontal direction. There should be something. In this case, in the second embodiment, the subdivided holograms may be arranged in the horizontal direction.
Further, the hologram may be irradiated with light having a condensing property in any of the vertical and horizontal directions.
In the embodiment, minute rectangular subdivided holograms may be arranged in a grid pattern.

In the HMSL in which the reproducing light source emits parallel light as shown in FIG. 12, for example,
As shown in FIG. 11A, the hologram 3B is reproduced by the reproduction light source 10
If the size is smaller than the size of the opening 11c of the reproduction light source 1,
Even if there is some relative displacement between 0 and the hologram 3B, the hologram 3B is reliably irradiated with the light from the reproduction light source 10, so that the brightness of the reproduced image is somewhat reduced. The problem that the image of the hologram is not partially reproduced can be solved. On the contrary, as shown in FIG. 11B, if the hologram 3C is made larger than the size of the opening 11c of the reproduction light source 10, all the light from the reproduction light source 10 is applied to the hologram 3C, so that the hologram 3C is generated. Although the image is not reproduced in a part of the above, the problem that the brightness of the reproduced image is reduced can be solved because the amount of light from the reproduction light source is entirely used. In each of the above embodiments, a light bulb is used as the light source of the reproduction light source, and red light is emitted by the red filter.However, a red light bulb or a red light emitting diode is used as the light source, and a white transparent plate is used for the filter or the condenser lens. You may use.

[0018]

As described above, according to the present invention, the width dimension of the hologram is made smaller than the width dimension of the opening for light irradiation of the reproduction light source, and the light from the reproduction light source configured as a condensing light source. Since the hologram is irradiated with the width dimension smaller than the width dimension of the opening, it is possible to reduce the hologram width dimension for the purpose of appearance and to perform light irradiation with a high light amount. , The reproduced hologram image is bright, and the visibility is high, and H that meets the standard
MSL can be obtained. In addition, the hologram is composed of a plurality of subdivided holograms, and the incident light angle characteristics of each subdivided hologram are made to differ according to the light converging light angle that is incident on each of them, so that Even when the hologram is irradiated with the above light, it is possible to reproduce in a predetermined angle direction, and it is possible to obtain an HMSL having high visibility.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a first embodiment of an HMSL of the present invention.

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

FIG. 3 is a partially exploded perspective view of a reproduction light source.

FIG. 4 is a perspective view schematically showing a reflector of a reproduction light source.

FIG. 5 is a sectional view showing a modification of the first embodiment.

FIG. 6 is a cross-sectional view showing another modification of the first embodiment.

FIG. 7 is a cross-sectional view showing another modification.

FIG. 8 is a partially cutaway perspective view of a second embodiment of the present invention.

9A and 9B are a schematic diagram of a hologram for explaining a problem that may occur in the first embodiment, and a diagram showing characteristics of an incident light angle and image reproduction efficiency.

FIG. 10 is a schematic cross-sectional view showing the structure of the hologram of the second embodiment.

FIG. 11 is a sectional view showing a different example of the third embodiment of the present invention.

FIG. 12 is a perspective view showing the concept of HMSL to which the present invention is applied.

[Explanation of symbols]

 1 HMSL (High Mount Stop Lamp) 2 Rear Window Glass 3, 3A-3C Hologram 4 Rear Parcel Shelf 10 Playback Light Source 11 Body 11c Opening 12 Red Filter 14 Light Bulb

Claims (2)

[Claims] 1. A high mount stop lamp for an automobile, comprising: a hologram extending on a rear window glass surface of the automobile; and a reproduction light source for irradiating the hologram with light to reproduce an image toward the rear of the automobile. The hologram is formed smaller than the width dimension of the light irradiation opening of the reproduction light source, and the reproduction light source is configured as a light-collecting light source, and the light from the reproduction light source is smaller than the width dimension of the opening. A high mount stop lamp for an automobile, characterized in that the hologram is irradiated in a width dimension state. 2. A hologram is composed of a plurality of subdivided holograms, and the incident light angles of the subdivided holograms are different depending on the incident angles of the condensing or diffusing light incident on the respective holograms. A high mount stop lamp for an automobile according to claim 1.