JPH04342624A - Lighting equipment for vehicle - Google Patents

Abstract

PURPOSE:To permit the display having the superior recognition performance from behind a vehicle, even if the diffracted light is the scattered light, by allowing the light radiated from a light source to be diffracted by a plurality of hologram elements and to be radiated rearward from the vehicle. CONSTITUTION:White light is reflected by a reflector 15, and inputted into a red filter 12, and the red light 30 having a prescribed light distribution is radiated from a lens 12. Between heating coils 16a and 16b, hologram elements a1-a4 which constitute a hologram element group 13 are arranged in the horizontal direction of a vehicle, and one among the heating coils 16a-16e is positioned on the upper side and lower side of 16-pieces of the hologram elements. When a foot brake pedal is pressed, the red light 30 is radiated from a light source 10, and the red light 30 is inlutted into the hologram element group 13, and deffracted behind a vehicle by the hologram element. An image which lights red can be viewed because of each hologram element from behind the vehicle. The cloudiness on the car room inside can be removed by the heating coils 16.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a vehicle lamp.
In particular, the present invention relates to a vehicle lamp that uses a hologram element to display information outside the vehicle interior.

0002

2. Description of the Related Art A vehicle lamp using a transmission type hologram element is known as a high-mount stop lamp. An example of such a device is shown in FIG. In FIG. 7, 21, 22, and 23 are a rear window, a rear parcel, and a roof, respectively. 90 is a light source;
It is composed of a white light bulb or a red LED whose surface is covered with a red filter 92, a reflector 91, and a lens 92. Light source 90 emits red light 95 when a foot brake pedal (not shown) is depressed. 93 is a hologram element, and red light 95 emitted from the light source 90
is manufactured to be diffracted to the rear of the vehicle.

[0003] Next, the operation will be explained. When the foot brake pedal is depressed by the driver, red light 95 is emitted from the light source 90. The red light 95 enters the hologram element 93 and is diffracted by the hologram element 93 toward the rear of the vehicle. As a result, the hologram element 93 appears to be emitting red light from the rear of the vehicle.

A method of manufacturing the above hologram element will be explained based on FIG. In FIG. 8, 96 is a hologram dry plate. 97 and 98 are laser beams, both of which are He-Ne lasers (wavelength 632.8 [n
m]) is used. Further, the laser beam 98 is a diverging light emitted from a point light source 99. Hologram dry plate 96
Laser beams 97 and 98 are incident on the surface 96a of the hologram dry plate 96 to expose it. As a result, the hologram dry plate 9
6 records interference fringes of laser beams 97 and 98 to form a diffraction grating. Then, by developing the hologram dry plate 96, the above-mentioned hologram element 93 is obtained.

A laser beam 97 is applied to the hologram element 93.
When red light is incident at an angle equal to , the red light is diffracted in the direction in which the laser beam 98 travels. At this time, since the laser beam 98 is a diverging light, the diffracted red light also becomes a diverging light, and display can be performed over a wide range.

[0006]

As described above, when the red light diffracted by the hologram element 93 is made into diverging light, an image can be seen from the rear of the vehicle at the position where the red light is focused. That is, since an image corresponding to the point light source 99 when the hologram element 93 is exposed is visible, the hologram element 93 becomes bright at the center and dark at the periphery. As a result, there was a problem that a wide area could not be displayed with sufficient brightness.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a vehicular lamp that can provide sufficient display over a wide area.

[0008]

[Means for Solving the Problems] The present invention is a vehicle lamp having a heat ray, a hologram element group, and a light source,
A plurality of the heat wires are installed in the rear window and generate heat when an electric current is passed through them, and the light source is installed in the vehicle interior and emits light in the direction of the hologram, and the light source is installed in the vehicle interior and emits light in the direction of the hologram. consists of a plurality of hologram elements installed close to each other between the heating wires installed in the rear window, and diffracts the light emitted from the light source toward the rear of the vehicle.

[0009]

According to the present invention, light emitted from a light source is diffracted by a plurality of hologram elements and emitted toward the rear of the vehicle. Therefore, when the diffracted light is made into diverging light, the same number of images as the number of hologram elements can be seen from the rear of the vehicle, emitting red light due to the diffracted light of each hologram element.

[0010] Furthermore, since the utilization rate of the luminous flux emitted from the light source is improved compared to when display is performed using a single hologram element, the overall display can be made brighter.Furthermore, each hologram element is installed between. Therefore, it is possible to suppress changes in the characteristics of the diffracted light and deterioration of the hologram element due to the heat radiated from the heat rays. Furthermore, the peripheral portion of each hologram element contributes to a lesser extent to the display than the central portion. Therefore, even if the periphery of the hologram element is adversely affected by the heat of the heat rays, the adverse effect on the display can be sufficiently suppressed.

[0011]

Embodiment A first embodiment of the present invention will be described based on FIGS. 1 to 3. In FIG. 1, 21, 22, 2
3 are a rear window, a rear parcel, and a roof, respectively.

Reference numeral 10 denotes a light source, which is installed on the interior side of the roof 23. The light source 10 includes a lens-cut red filter 12, a white light bulb 14, and a reflector 15.
It consists of In addition, the red filter 12 and the white light bulb 1
4 may be replaced by a red LED. When a foot brake pedal (not shown) is depressed, white light is emitted from the white light bulb 14. The white light is reflected by the reflector 15 and enters the red filter 12, and the lens 12 emits red light 30 having a predetermined light distribution.

13 is a hologram element group consisting of a plurality of hologram elements, and the red light 3 emitted from the light source 10 is
It is manufactured to diffract 0 towards the rear of the vehicle. Also,
The hologram element group 13 is installed on the interior side of the rear window 21.

The detailed structure of the hologram element group 13 will be explained based on FIG. 2. 16a, 16b, 16c
, . . . , 16f is a heating wire installed on the inside of the vehicle interior of the rear window 21, and when a switch (not shown) installed at the driver's hand is turned on, current flows and heat is generated. This heat warms the rear window 21 and removes condensation (fog) that has formed on the rear window 21 on the vehicle interior side. In addition, the hot wires 16a, 16b, 16c,...
. , 16f are installed at a distance L from each other and approximately parallel to the horizontal direction of the vehicle.

Between the hot wire 16a and the hot wire 16b, there are hologram elements a1 and a2 constituting the hologram element group 13.
, a3, and a4 are installed side by side in the horizontal direction of the vehicle. Further, between the hot wire 16b and the hot wire 16c, hologram elements b1, b2, b3 constituting the hologram element group 13 are arranged.
, b4 are installed, and a hologram element c1 constituting the hologram element group 13 is installed between the hot wire 16c and the hot wire 16d.
, c2, c3, and c4 are installed side by side in the horizontal direction of the vehicle, and hologram elements d1, d2, d3, and d constituting the hologram element group 13 are arranged between the hot wires 16d and 16e.
4 are installed side by side in the horizontal direction of the vehicle.

The 16 hologram elements have a length L in the vertical direction, and are sized so that one of the hot wires 16a, 16b, 16c, 16d, and 16e is located on the upper and lower sides of each hologram element. is set.

Next, the operation will be explained based on FIG. When the foot brake pedal is depressed by the driver, red light 30 is emitted from the light source 10. The red light 30 is incident on the 16 hologram elements constituting the hologram element group 13, and is diffracted toward the rear of the vehicle by these hologram elements. As a result, an image emitting red light from each hologram element can be seen from the rear of the vehicle.

Further, the rear window 21 is heated by the heating wires 16 installed at equal intervals on the rear window 21, and the fog on the interior side of the rear window 21 and the surface of the hologram element group 13 is evenly removed.

Furthermore, the peripheral portion of each hologram element contributes less to the display than the central portion. Therefore, even if the periphery of the hologram element is adversely affected by the heat of the heat rays, the effect on the display can be sufficiently suppressed.

Based on FIG. 3, the above hologram element group 1
The manufacturing method of No. 3 will be explained. In FIG. 3, 46 is a hologram dry plate. Reference numerals 31 and 40 each indicate a laser beam, and both use a He-Ne laser (wavelength: 632.8 [nm]), which is a point light source. Note that the positional relationship between the hologram dry plate 46 and the laser beam 40 is set to be approximately equal to the positional relationship between the hologram element group 13 and the red light 30.

Hologram element a is placed on the surface 46a of the hologram dry plate 46 (corresponding to the interior side of the hologram element group 13).
A mask 47 is installed except for the position 1. and,
A diverging laser beam 31 and a laser beam 40 are made incident on a portion of the surface 46a of the hologram dry plate 46 where the mask 47 is not applied. The area of the hologram dry plate 46 where the mask 47 is not applied is exposed to the laser beams 31, 40.
record the interference fringes.

Similarly, the position of the mask 47 is moved vertically or horizontally, and interference fringes between the laser beam 40 and the laser beams 31, 32, 33, etc. substantially parallel to the laser beam 31 are recorded for each. let Then, by developing the hologram dry plate 46,
The above hologram element group 13 is obtained. When red light with an incident angle equal to that of the laser beam 40 is incident on such a hologram element group 13, this red light is incident on the laser beam 31.
, 32, 33, . . . are diffracted in the traveling direction.

[0023] Also, the laser beams 31, 32, 33, .
Since the traveling direction of each of the hologram elements 13 can be set to any desired direction, the light distribution of the hologram element group 13 can be optimized, and a display with good visibility can be performed. For example, the central hologram elements b2, b3, c2, c
The diffracted light by 3 is horizontal, the diffracted light from the upper hologram elements a1, a2, a3, a4 is slightly downward, and the diffracted light from the lower hologram elements d1, d2, d3, d4 is slightly upward. Therefore, it is possible to narrow the light distribution of the hologram element group 13 as a whole. In addition, the diffracted light by the central hologram elements b2, b3, c2, c3 is in the horizontal direction, and the upper hologram elements a1, a2, a
The light distribution of the hologram element group 13 can be widened by directing the diffracted lights of the hologram elements 3 and a4 slightly upward and the diffracted lights of the lower hologram elements d1, d2, d3, and d4 slightly downward.

As described above, according to this embodiment, the hot wires 16a, 16b, 16c, 16d, 1
6e, hot wires 16a, 16b, 16c, 16d,
Sixteen hologram elements were installed between the hologram elements 16e to form a hologram element group 13, and the red light from the light source 10 was diffracted toward the rear of the vehicle by each hologram element.

[0025] Therefore, since the image of the light source 10 can be seen by each hologram element, even if the diffracted light is made into diverging light, a large display area can be obtained and a display with excellent visibility from the rear of the vehicle can be performed. You can get the effect that you can. Further, since the light distribution can be easily optimized by widening, narrowing, or narrowing the light distribution, it is possible to achieve the effect that display with even better visibility can be performed. In addition, since the hot wires 16a, 16b, 16c, 16d, and 16e are positioned at the joints of each hologram element, even if the hologram element is affected, the effect on the display as a high mount stop lamp is sufficiently suppressed. be able to. Furthermore, hot wire 1
6a, 16b, 16c, 16d, and 16e can remove condensation generated on the surface of the hologram element group 13, thereby improving the efficiency of diffraction by the hologram element and further improving the visibility of the display from the rear of the vehicle. This effect can be obtained.

Next, a second embodiment of the present invention will be explained based on FIGS. 4 to 6. In FIG. 4, 21,
22 and 23 are a rear window, a rear parcel, and a roof, respectively.

A light source 50 is embedded in the rear parcel 22. The light source 50 includes white light bulbs 51 and 52 and a red filter 62. white light bulb 51,5
2 are installed at a distance H apart. When the foot brake pedal (not shown) is stepped on, the white light bulbs 51 and 52
The light emitted from the red light filter 62 is emitted to the interior of the vehicle interior as red light 56 and 57, respectively.

Reference numeral 68 denotes a hologram element group consisting of a plurality of hologram elements, which emits red light 5 emitted from the light source 50.
6,57 to the rear of the vehicle. Further, the hologram element group 68 is installed on the interior side of the rear window 21. 16c, 16d, and 16e are hot wires, and when a switch (not shown) installed at the driver's hand is turned on, current flows and generates heat. This heat warms the rear window 21 and removes condensation (fog) that has formed on the rear window 21 on the vehicle interior side.

The detailed structure of the hologram element group 68 will be explained based on FIG. 5. Hot wire 16a, 16b, 1
6c, . . . , 16f are installed at a distance L from each other and substantially parallel to the horizontal direction of the vehicle.

Between the hot wire 16b and the hot wire 16c, hologram elements 55a and 5 constituting a hologram element group 68 are arranged.
5b and 55c are installed side by side in the horizontal direction of the vehicle. Moreover, between the heating wires 16d and 16d, hologram elements 54a, 54b, which constitute the hologram element group 68,
A hologram element 53 constituting a hologram element group 68 is installed between the hot wire 16d and the hot wire 16e.
a, 53b, and 53c are installed side by side in the horizontal direction of the vehicle.

The length of the nine hologram elements in the vertical direction is slightly shorter than L, and there is a slight gap between each hologram element and the other hologram elements at the top and bottom sides. Heat wires 16b, 16c, 16d, and 16e are installed at the upper end or lower end of each hologram element.

Next, the operation will be explained based on FIG. 4. When the foot brake pedal is depressed by the driver, red light 56, 57 is emitted from the light source 50. red light 56,
The light beam 57 is incident on nine hologram elements constituting a hologram element group 68, and is diffracted toward the rear of the vehicle by these hologram elements. As a result, an image emitting red light from each hologram element can be seen from the rear of the vehicle.

Further, the rear window 21 is heated by the heating wires 16 installed at equal intervals on the rear window 21, and the fog on the interior side of the rear window 21 and the surface of the hologram element group 68 is evenly removed. However, since the heating wire 16 is located in the gap between each hologram element, the amount of heat directly transmitted to the hologram element is reduced. Therefore, the peripheral area of the hologram element is less likely to be adversely affected by the heat of the heat rays, and the adverse effect on the display can be sufficiently suppressed.

Based on FIG. 6, the above hologram element group 6
The manufacturing method of No. 8 will be explained. In FIG. 6, 63, 64,
65 is a hologram dry plate. The points 76 and 77 are separated by a distance H, and the positional relationship between the hologram dry plates 63, 64, 65 and the points 76, 77 is equal to the positional relationship between the hologram elements 53a, 54a, 55a and the white light bulbs 51, 52. It is set.

70 and 71 are laser beams, both of which are He-Ne lasers (wavelength: 632.8 [
nm]) is used. Laser beam 70 is at point 76
, 77 and enters the hologram dry plate 63. Further, the laser beam 71 is a parallel beam having a predetermined width.

The hologram dry plate 63 is placed on a glass plate or the like, and the optical system is set so that the laser beams 70, 71 and the hologram dry plate 63 are in a predetermined positional relationship. Then, a laser beam 70 and a laser beam 71 are made incident on the surface 63a side of the hologram dry plate 63. The hologram dry plate 63 records the interference fringes of the laser beams 70, 71.

Similarly, laser beams 72 and 72 converge on the hologram dry plates 64 and 65 through points 76 and 77, respectively.
74, and a laser beam 7 approximately parallel to the laser beam 71.
Record interference fringes with No. 3 and 75. Then, by developing the hologram dry plates 63, 64, 65, hologram elements 53a, 54a, 55a are obtained. When red light is incident on the hologram element thus obtained at an incident angle equal to that of the laser beams 70, 72, and 74, each of the red lights is diffracted in the traveling direction of the laser beam 71. Therefore, the red light emitted from the plurality of light bulbs 51, 52 is transmitted to the hologram elements 53a, 54a, 55a.
The rate of diffraction increases. Note that the hologram elements 53b, 53c, 54b, 54c are formed using the same method.
, 55b, 55c are obtained.

[0038] Also, the laser beams 71, 73, 75, .
Since the traveling direction of each of the hologram elements 68 can be set to any desired direction, the light distribution of the hologram element group 68 can be optimized, and a display with good visibility can be performed.

As described above, according to the second embodiment, the hot wires are installed in the rear window 21, and the hot wires 16b, 16c,
Between 16d and 16e, nine hologram elements that are slightly smaller than the spacing between the hot wires and exposed to convergent light are installed to form a hologram element group 68, and the red light from the light source 50 is directed to each hologram element. It is now diffracted to the rear of the vehicle.

Therefore, the same effects as in the first embodiment can be obtained, and even when a plurality of light bulbs are used as the light source, the efficiency of light utilization can be increased. In addition, heating wires 16b, 16 are provided in the gaps between each hologram element.
Since the hologram elements c, 16d, and 16e are located at the same positions, the influence of heat on each hologram element can be reduced.

Note that, as shown in FIG. 9, the heating wire may be placed so as to bypass the hologram element.

[0042]

As described above, according to the present invention, a plurality of heating wires are installed in the rear window, hologram elements are installed between the heating wires to form a hologram element group, and the red light from the light source is transmitted to each hologram element. It is now diffracted to the rear of the vehicle.

Therefore, even when the red light diffracted by the hologram element is made into diverging light, it is possible to achieve the effect that a display with excellent visibility from the rear of the vehicle can be performed. Further, since the light distribution of the light diffracted by the hologram element group can be easily optimized, it is possible to achieve the effect that display with even better visibility can be performed. moreover,
Since the heating wire is located at the joint between each hologram element, even if the hologram element is affected by the heat from the heating wire, the effect on the display as a high mount stop lamp can be sufficiently suppressed. can get.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the configuration of a first embodiment.

FIG. 2 is a perspective view showing the configuration of a first hologram element group 13.

FIG. 3 is a cross-sectional view showing a method of manufacturing the first hologram element group 13.

FIG. 4 is a sectional view showing the configuration of a second embodiment.

FIG. 5 is a perspective view showing the configuration of a second hologram element group 68.

FIG. 6 is a cross-sectional view showing a method of manufacturing a second hologram element group 68.

FIG. 7 is a sectional view showing the configuration of a conventional example.

FIG. 8 is a sectional view showing a method of manufacturing a conventional device.

FIG. 9 is a perspective view showing another embodiment.

[Explanation of symbols]

10 Light source 13 Hologram element group 16a, 16b, 16c, 16d, 16e Heat ray 21 Rear window

Claims (1)

[Claims] Claim 1: The vehicle comprises a heating wire, a hologram element group, and a light source, the plurality of the heating wires are installed in a rear window and generate heat when an electric current is passed therethrough, and the light source is located inside a vehicle interior. and radiates light in the direction of the hologram, and the hologram element group consists of a plurality of hologram elements installed close to each other between each of the heating wires installed in the rear window, A vehicle lamp that diffracts light emitted from a light source toward the rear of the vehicle.