JP2963302B2 - 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 for clearly confirming a brake to a following vehicle, and in recent years, an HMSL in which a rear window glass of an automobile is displayed through a window has been proposed. However, when the HMSL is provided at the rear window position, the rear view of the driver of the own vehicle may be restricted. Therefore, recently, a hologram is proposed. For example, the applicant has previously proposed in Japanese Patent Application Laid-Open No. 3-65448 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 provided to face the hologram. By irradiating the reproduction light from the vehicle, the reproduced hologram image can be visually recognized from the rear of the automobile. In this HMSL, a lens step image used for a conventional HMSL is recorded on a hologram,
If red light is used as the reproduction light, a red lens step image can be visually recognized from a following vehicle, and can effectively function as an HMSL.

[0003] For example, FIG. 12 is a perspective view showing a schematic configuration of the rear parcel shelf facing a hologram 3 with a hologram 3 ′ formed in a film shape attached to the inner surface of a rear window glass 2 of an automobile. 4, a reproduction light source 10 'is arranged. And this reproduction light source 1
The hologram image is reproduced outside the rear window glass 2 by irradiating the hologram 3 ′ with the reproduction light emitted from 0 ′. 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 this type, the hologram 3 'diffracts light in a required angle direction corresponding to the angle of the incident light to generate a hologram image. Each of these angles
It is necessary to make the incident light angle equal to the incident light angle) and the incident angle of the light from the reproduction light source. For this reason, in the HMSL shown in FIG. 12, the reproduction light source 10 'is limited to a configuration in which parallel light is emitted, and the light from the reproduction light source 10' is applied to any part of the hologram 3 'at the same angle. The configuration is adopted to cause the Therefore, in this type of HMSL in which the hologram 3 'is arranged along the rear window glass 2, the installation position of the reproduction light source 10' is limited corresponding to the hologram 3 ', and the design flexibility is limited. Will receive it. On the other hand, since the image reproduced by the hologram 3 'is limited to the angle of the emitted light, the angle range in which the hologram image can be viewed from behind the vehicle is also limited, and it is difficult to view the hologram image over a wide range. SUMMARY OF THE INVENTION It is an object of the present invention to provide an HMSL in which image reproduction by a hologram is improved to enhance visibility and design flexibility is improved.

[0005]

Means for Solving the Problems The HMSL of the present invention extends to the rear window glass surface of an automobile, and a hologram reconstructing an image by irradiating light from the reproducing light source, each image regeneration efficiency up the incident light angle at which is a structure in which a set of holograms plurality of subdivided different, and the center
For the arrayed subdivided holograms,
Toward the side, the value of the incident angle is positive side, negative side
The subdivided holograms were arranged so as to be sequentially larger.
Configuration .

[0006]

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 affixed to the inner surface of the rear window glass 2 attached to the opening of the body of the car along the lower edge of the central portion. ing. A reproduction light source 10 is provided on the rear parcel shelf 4 at a position facing the hologram 3. As shown in FIG. 3, the reproducing light source 10 has a funnel-shaped body 11 which is formed to be elongated horizontally, and a body 1.
A housing is constituted by the red lens 12 attached to the opening 11b on the front of the first lens. Here, a flange 11a is formed over the entire periphery of the opening edge of the body 11, and a peripheral portion 12a of the red lens 12 is adhered to the flange 11a with an adhesive or the like to seal the inside.

A bulb insertion hole 13 is formed on one side of the body 11, and a bulb 14 is inserted into the bulb insertion hole 13.
The light bulb 14 is arranged at a required position in the body. A protector 16 made of a metal plate or the like is supported on the inner surface of the body 11 located above the light bulb 14 by a guide 17 extending from the inner surface of the body 11. To prevent damage. The rear surface of the body 11 has a parabolic cross section in the vertical and horizontal directions, and a metal film such as aluminum is formed on the inner surface thereof to constitute a reflector 18. The light from the bulb 14 is transmitted through the opening 11b. And reflected as parallel light. A box-shaped portion 19 having a hollow inside is integrally formed on both outer side surfaces of the body 11 so as to protrude in both side directions, and the outer surface of the box-shaped portion 19 has a required angle with respect to the front opening. Thus, the flange 20 is formed. This flange 20
Is provided with a bolt insertion hole 21 for attaching the body 11 to an automobile.

On the other hand, as shown in FIG. 3, the hologram has a plurality of regions (five regions in this case) in the vertical direction.
The configuration is divided into two. That is, a plurality of holograms 31 to 35 which are subdivided in the vertical direction and are extremely thin in the horizontal direction are arranged in the vertical direction, and these are integrated to constitute one hologram 3. Each subdivided hologram 31-35
Are formed so that their predetermined incident light angles are different from each other. Here, each incident light angle is set corresponding to the light-collecting reproducing light source. That is, as shown in FIG. 4A, the relationship between the incident light angle of the general hologram 3 ″ and the image reproduction characteristic is such that the hologram 3 ″ has a predetermined incident light angle θIN with respect to a direction perpendicular to the surface. Since the image is reproduced at a predetermined output light angle θOUT with respect to the incident light, the efficiency of image reproduction is maximized at the incident light angle θIN, and when the incident light angle θIN deviates, the predetermined output light angle θOUT The brightness of the image in the direction may be reduced, and may not meet the HMSL standard.

Therefore, as shown in FIG. 4 (b), in the hologram 3, the subdivision hologram 33 positioned at the center is formed at the same predetermined incident light angle θIN as before.
And each of the subdivided holograms 32, 34 and 3 arranged vertically above and below the central subdivided hologram 33.
The incident light angles 1 and 35 are sequentially increased in the minus or plus direction with respect to the incident light angle θIN of the hologram 33, such as angles −θ1, + θ1, −θ2, + θ2. In order to form such a hologram, a plurality of holograms previously formed at different incident light angles are subdivided, a pair of subdivided holograms are taken out of each different hologram, and these are respectively placed above and below the central subdivided hologram. After disposing, there is a method in which the components are integrated by attaching them to a common transparent base plate or the like. Alternatively, when a single hologram is created, there is a method in which a thin slit-shaped mask is used, and the mask is moved and the incident light angle is sequentially changed to sequentially expose the mask.

In the HMSL having this configuration, the reproduction light source 10
Is installed in a rectangular hole opened in the body panel 5 of the rear parcel shelf 4, and as shown by a broken line in FIG.
Flanges 20 provided on both sides of the body using bolts 7 screwed into tap holes provided in body panel 5
Is attached to the body panel 5, and the body 11 is attached to the body panel 5.
It is attached in a state inclined backward with respect to the horizontal plane.
At this time, the red lens 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 a certain dimension. A decorative panel 6 for decorating the rear parcel shelf 4 is provided above the vehicle body panel 5.

The light emitted from the bulb 14 is directly
Alternatively, by being reflected by the reflector 18 and refracted by the cylindrical red lens 12, the light is emitted from the reproduction light source as red light which is parallel in the horizontal direction and convergent in the vertical direction. Then, the red light is projected onto the hologram 3 and transmitted through the hologram 3, so that a red hologram image can be observed from the rear of the rear window glass 2, and functions as an HMSL. At this time, as shown in FIG. 4B, the hologram 3 has the characteristics that the subdivided holograms 31 to 35 are formed so as to have different incident light angles about the optical axis. Even if the angle of the light incident on each of the subdivided holograms 31 to 35 is different due to the condensing light, the incident light at these different angles is incident on the subdivided holograms 31 to 35 at the incident light angle. Will be matched. Therefore, as a result, light is output from each of the subdivided holograms 31 to 35 at an equal output light angle, and light emission at a predetermined angle is realized as a whole of the hologram 3, and the hologram image reproduced at this output light angle is brightened. , Predetermined HMS
It is possible to satisfy the criteria of L.

Therefore, the subdivided holograms 31 to 35
By designing the incident light angles arbitrarily, even when the relative position and the relative angle between the hologram 3 and the reproduction light source 10 are arbitrarily set, the image reproduction with high visibility can always be realized. The degree of freedom can be increased.
In the above embodiment, since the width of the opening 11b of the reproduction light source 10 in the vertical direction is larger than the corresponding width of the hologram 3, the light emitted from the opening 11b is focused. It is possible to reproduce a bright image by irradiating the hologram and increasing the amount of light per unit area of the hologram.

If the incident light angles of the subdivided holograms 31 to 35 constituting the hologram 3 are not different as described above, as shown in FIG.
Light is incident on the central subdivision hologram 33 at a predetermined incident light angle.
At 2, 34, and 35, the holograms are incident on the hologram at different angles in the plus and minus directions.
The output light angles at 4 and 35 are also different, so that the efficiency of image reproduction in each of them is reduced. In particular, the brightness of the image in the direction of the predetermined output light angle is reduced, and the HMSL standard may not be satisfied.

FIG. 6 shows a second embodiment of the present invention, in which the reproduction light source 10A is constituted by a diffuse reflection type light source. That is, the bulb 14 is supported inside the body 11A, and the reflector 1 formed on the inner surface of the body 11A is provided.
8A is configured as a diffuse reflection surface that reflects light parallel to the horizontal direction and diffuses light vertically. A red filter 12A formed in a container shape is attached to the opening at the front of the body 11A.
Adhered to A. Therefore, in the reproduction light source 10A, the light from the bulb 14 is reflected by the reflector 18A of the diffuse reflection surface.
Are diffused in parallel in the horizontal direction and in the vertical direction, are emitted as red diffused light through the red filter 12 </ b> A, and irradiate the hologram 3. The hologram 3 has a configuration in which subdivided holograms 31 to 35 having different incident light angles are arranged as in the first embodiment. Accordingly, the diffused light from the reproduction light source 10A is incident on each of the subdivided holograms 31 to 35 of the hologram 3 at different incident angles, respectively.
Since the incident light angle of 35 coincides with this incident angle, the light is emitted from each of the subdivided holograms 31 to 35 at the same angle, and the image is reproduced at the predetermined emitted light angle as the hologram 3 as a whole. become. In this embodiment, a diffuse reflection surface is used for the reflector. However, a condensing type reflector may be used. In this case, a filter or a condenser lens for converting the condensed light into parallel light is arranged on the front surface of the reflector. You may.

FIG. 7 shows a third embodiment of the present invention, in which a reproducing light source is constituted by an LED. The body 11B of the reproduction light source 10B has a fan-shaped cross section, and a circuit board 22 on which a number of red LEDs 23 are arranged is disposed on the inner bottom surface. The back surface of the arc-shaped body 11B is configured as a reflector 18B having a diffuse reflection surface in the vertical direction. Further, a white transparent lens 12B having saw-toothed steps arranged in one direction is attached to an opening at the front of the body 11B. The reproduction light source 10B is buried in a hole of the rear parcel shelf 4, and the white transparent lens 12B is fixed so as to be at substantially the same surface position as the surface of the rear parcel shelf 4. In this configuration, each L
The red light emitted by the ED 23 is emitted through the lens 12B directly or after being reflected by the reflector 18B. At this time, the red light is refracted in the same oblique direction by the saw-toothed steps, and has a slight light collecting property. The hologram 3 is irradiated as red light. The hologram 3 is composed of subdivided holograms 31 to 35 as in the first embodiment and the second embodiment, and differs for each subdivided hologram 31 to 35 depending on the condensing light from the reproduction light source 10B. Although the light is incident at the incident light angle, the image is reproduced at the predetermined emitted light angle as the whole hologram 3.

FIG. 8 is a sectional view of a fourth embodiment of the present invention. Here, the hologram 3 is a plurality of subdivided holograms 3.
FIG. 4 shows the incident light angles and the characteristics of image reproduction for each of FIGS.
The difference is the same as in the case shown in (b), but here, a reproduction light source 10C configured to irradiate the hologram with parallel light is used. As this reproduction light source,
By forming the reflector 18C formed on the body 11C on a paraboloid, the light reflected by the reflector 18C is emitted as parallel light from the opening of the body 11C, and is transmitted to the hologram through the red filter 12C. . Here, the red filter 12C has a configuration in which a peripheral portion 12b is inserted into a groove 11c provided in the body 11C, and a lance 12c provided in a part is fitted into a hole 11d provided in the body 11C to fix the red filter 12C. Has been taken. According to this configuration, as shown in FIG. 9, parallel light is applied to the subdivided holograms 31 to 35 having different characteristics, so that the subdivided holograms 31 to 35 are directed toward different emission light angles. A hologram image is reproduced. At this time, the upper and lower subdivided holograms 31, 32, 34, and 35 are respectively emitted in the directions of vertically diffusing around the central subdivided hologram 33 to reproduce the image. When the hologram 3 is viewed as a whole, the hologram image from behind the automobile can be confirmed in a wide angle range in the vertical direction, and the HMSL
Can be improved.

The hologram image is usually used to reproduce a virtual image at a position seen through the hologram from behind the automobile, and the position of the reproduced virtual image is vertically divided into subdivided holograms 31 to 35. 10, the positions of the images I1, I3, I5 and I2, I4 reproduced by the respective subdivided holograms 31, 33, 35 and 32, 34 are alternately arranged as shown in FIG. In addition, by making the difference between the front and rear, the hologram image viewed from behind the car will appear to be alternately shifted back and forth in a vertically elongated horizontal image, and the viewed image will have depth. This makes it possible to further enhance the visibility of the HMSL.

Further, as shown in FIG. 11A, the hologram 3A may be subdivided in the horizontal direction and subdivided holograms 3A1, 3A2,... Alternatively, as shown in FIG. 11B, the hologram 3B is subdivided in the vertical and horizontal directions, respectively, and rectangular holograms 3B11, 3B12,..., 3B21, 3B
., And these may be arranged in a grid pattern. The hologram 3A thus subdivided,
Also in 3B, a hologram image having a depth and high visibility can be reproduced by arbitrarily changing the positions of the reconstructed images of the subdivided holograms as in the above-described embodiments.
Further, as shown in FIG. 11C, a predetermined pattern is defined on the hologram 3C, and the position of the virtual image reproduced by the pattern portion 3C1 is changed to the portion 3C where no pattern is formed.
2 and the pattern portion 3C1
May be reproduced from other parts to enhance the visibility of the pattern.

[0019]

As described above, according to the present invention,
A hologram is formed by assembling a plurality of subdivided holograms having different incident light angles at which the image reproduction efficiency is maximized .
Array of subdivided holograms arranged at the center
The value of the incident angle is positive on both sides of the
The subdivided hologram is gradually increased toward the eggplant side.
Since the array is arranged and the image is reproduced by irradiating the hologram with light, for example, by irradiating the hologram with condensing or diffusing light, appropriate light irradiation is performed over the entire area of the hologram. Efficient image reproduction can be performed, the degree of freedom in HMSL design can be increased, and image reproduction with high visibility can be realized. Further, by irradiating the hologram with parallel light, the angle of the light emitted from the hologram can be increased, and the reproduced image can be visually recognized from a wide range, so that the visibility can be improved.

[Brief description of the drawings]

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

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 reproduction light source and a hologram are partially broken.

FIG. 4 is a diagram showing a configuration of a hologram and a state of input and output of light.

FIG. 5 is a diagram showing a state of light incidence / emission of a conventional hologram.

FIG. 6 is an enlarged sectional view of a second embodiment of the present invention.

FIG. 7 is an enlarged sectional view of a third embodiment of the present invention.

FIG. 8 is an enlarged sectional view of a fourth embodiment of the present invention.

FIG. 9 is a diagram showing a configuration of a hologram of a fourth embodiment and a light input / output state.

FIG. 10 is a diagram showing a configuration of a hologram and a state of a reproduced image showing an application example of the present invention.

FIG. 11 is a perspective view showing a configuration of a hologram of another different application example of the present invention.

FIG. 12 is a schematic perspective view of a conventional HMSL using a hologram.

[Description of Signs] 1 HMSL (High Mount Stop Lamp) 2 Rear Window Glass 3 Hologram 4 Rear Parcel Shelf 10, 10A-10C Reproduction Light Source 12 Red Lens 12A, 12C Red Filter 14 Light Bulb 23 Red Light Emitting Diode 31-35 Subdivision Hologram

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

Claims (1)

(57) [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 behind the automobile. each image reproducing efficiency is constituted by a set of holograms incident light angle at which the maximum is a plurality of subdivided different, and the center
Of the subdivision hologram arranged in
The value of the incident angle is positive or negative toward both sides
The subdivided holograms are arranged so as to sequentially increase in size.
A high-mount stop lamp for an automobile.