JPH08201630A - Hologram and color image forming method using the same - Google Patents

Abstract

PURPOSE: To provide a hologram with which the simplification of device constitution and the less generation of mores and noises are possible and a color image forming method using the same. CONSTITUTION: A recording material 10 in the hologram 1 is provided with interference fringes to be irradiated with coherent light rays of red, green and blue in each of respective blocks 11 in the state of segmenting the material to the plural blocks 11 on the same plane. The recording material is also provided with filters to allow the transmission of the coherent light rays corresponding to the respective colors in each of the respective blocks 11. This color image forming method comprises simultaneously and continuously irradiating the hologram 1 having the filters with the coherent light rays of the respective colors, irradiating the hologram 1 with the coherent light rays of the respective colors at prescribed angles given thereto and aligning the optical axes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to red corresponding to three primary colors,
The present invention relates to a hologram for generating a color image by irradiating green and blue coherent light and a color image generating method using the hologram.

[0002]

2. Description of the Related Art A hologram is a scattered light obtained by irradiating a photosensitive plate with scattered light obtained by irradiating an arbitrary object with coherent light such as laser light and other coherent parallel light rays (reference light). Is produced by forming concentric interference fringes corresponding to each point of the object on the photosensitive plate and developing it. By irradiating this hologram with coherent parallel rays such as laser light, the interference fringes act as a lens as a diffraction grating, and a real image or a virtual image corresponding to the original image can be generated.

Further, by forming interference fringes corresponding to respective colors of red, green and blue on the hologram surface and irradiating laser light of three colors of red, green and blue, it is possible to colorize the holography. It will be possible. FIG. 8 is a diagram for explaining a conventional hologram and a color image generating method using the hologram. That is, the hologram 1 ′ in which the interference fringes corresponding to the respective colors of red, green and blue as described above are formed is irradiated with the light from the light source 2 through the optical circuit 3 as parallel rays.

That is, first, the hologram 1'is irradiated with the red laser light from the red laser 21 to obtain a red image, and then the green laser 22 emits the green laser light to the hologram 1 '.
To obtain a green image, and finally the blue laser 23 irradiates the hologram 1'with blue laser light to obtain a blue image. The three color images are additively mixed in the eye and recognized as one color image. Therefore,
As the timing of laser light irradiation, first, the entire surface is scanned with the red laser light, then the entire surface with the green laser light, and finally the entire surface with the blue laser light.
You will get one color image.

[0005]

However, in the case of such a hologram and a color image generating method using the hologram, it is necessary to scan the hologram three times in order to obtain one color image. There is a delay in processing time. Further, since three images of red, green, and blue are superposed to obtain one color image, high precision is required for the optical circuit and each device,
This causes complication of the image generating apparatus and cost increase. Further, in order to obtain a large image, it is necessary to widen the scanning range of the laser beam (the irradiation range of the parallel structure) and enlarge the hologram, and at that time, it is required that the alignment accuracy of the three color images is high. Will be. Further, when unnecessary light hits the interference fringes, for example, when green laser light hits the interference fringes corresponding to red, crosstalk occurs, which causes moire and noise.

[0006]

SUMMARY OF THE INVENTION The present invention is a hologram and a color image generating method using the hologram, which are made to solve the above problems. That is, the hologram of the present invention is one in which interference fringes that generate a predetermined image by irradiation of red, green, and blue coherent light are provided on a recording material, and the recording material has a plurality of blocks on the same surface. In the divided state, each block is provided with an interference fringe that is a target of irradiation of red, green, and blue coherent light. Further, each block is provided with a filter for transmitting coherent light corresponding to each color, which is provided with each interference fringe that is a target of irradiation of red, green, and blue coherent light.

Further, in the color image producing method using the hologram of the present invention, the hologram provided with the filter is red,
The coherent light of green and blue is continuously irradiated at the same time, the coherent light is irradiated onto the hologram at a predetermined angle, and the optical axes of the coherent light of the respective colors are matched.

[0008]

In the hologram of the present invention, the recording material is provided with interference fringes which are targets of irradiation of red, green and blue coherent light in each block in a state where the recording material is divided into a plurality of blocks on the same surface. Therefore, a color image that is a part of the entire image is obtained by a plurality of blocks of red, green, and blue. In other words, the red, green, and blue images obtained by irradiation with red, green, and blue coherent light are generated adjacent to each other without overlapping, and are recognized as one color image within the resolution range of human vision. Become.

Further, by providing a filter for transmitting coherent light corresponding to each color for each block having an interference fringe to be irradiated with coherent light of each color,
Only coherent light of the color required for image generation hits the interference fringes of each block, and crosstalk does not occur.

Moreover, in the color image generating method using the hologram of the present invention, the hologram provided with such a filter is irradiated with coherent light of each color simultaneously and continuously.
I'm getting one color image. That is, even if the coherent light beams of the respective colors are simultaneously and continuously irradiated, the interference fringes of the respective blocks are only irradiated with the coherent light beams of the required color by the filter. Further, by irradiating the hologram with a predetermined angle to the coherent light of each color, it is possible to obtain an image generation range corresponding to the irradiation angle. Furthermore, by matching the optical axes of the coherent light beams of the respective colors, it becomes possible to make the correspondence between the position of each interference fringe corresponding to each color on the recording material surface and the irradiation angle of the coherent light beam the same.

[0011]

Embodiments of the hologram of the present invention and a color image generating method using the hologram will be described below with reference to the drawings. FIG. 1 is a schematic view showing an embodiment of the hologram of the present invention, and (a) and (b) show respective modes. That is, the hologram 1 in this embodiment is
In the state where the hologram surface is divided into a plurality of blocks 11, for each block, interference fringes to be irradiated with red (R), green (G), and blue (B) coherent light (for example, laser light) (Fig. It is characterized in that each is equipped with (not shown).

Each block 11 is composed of, for example, a quadrangle having a side of several mm, and in the case of the hologram 1 shown in FIG. 1A, the entire image is composed of three blocks (R, G, B) in the horizontal direction in the figure. A color image forming one part is obtained. For example, in the block 11, the row in the vertical direction in the figure is a row, and the row in the horizontal direction is a column.
, The interference fringe corresponding to the red (R) color is recorded in the block 11 in the first row and the first column, and by irradiating a red laser beam or the like, one portion of the red image Can be generated.

Further, interference fringes corresponding to the green (G) color are recorded in the block 11 of the first row and the second column, and by irradiating a green laser beam or the like, one portion of the green image is recorded. It can be generated. Further, the interference fringe corresponding to the blue (B) color is recorded in the block 11 of the first row and the third column, and it is possible to generate one portion of the blue image by irradiating the blue laser light or the like. It has become.

The three-color images generated by the interference fringes recorded in these three blocks are generated in the adjacent positional relationship without overlapping, and are recognized as one color image within the resolution range of human vision. It will be. Less than,
Similarly, by sequentially irradiating the blocks 11, on which the red, green, and blue interference fringes are respectively recorded, with red, green, and blue laser light, for example, a color image in one image recorded on the hologram 1 is obtained. Can be obtained.

That is, laser beams of a predetermined color are sequentially scanned side by side from the block 11 in the first row, first column of the hologram 1, and after scanning the first row, the second row is set in the first column. To scan horizontally and sequentially. Then, similar scanning is sequentially performed until the block 11 in the final row and the final column, so that one color image is obtained. As described above, in the hologram 1 according to the present embodiment, it is possible to obtain one color image only by scanning the hologram 1 once with the laser light.

In the hologram 1 shown in FIG. 1B, for example, four adjacent blocks 11 (R, B, G,
According to G), a color image of a part of the entire image is obtained. Note that the combination of the blocks 11 for obtaining the color image of one portion is not limited to the four adjacent blocks 11 described above, and for example, the block 11 on the right side and the lower side on the basis of the block 11 on the (R) It may be configured with three (G) blocks 11 or three (B) blocks 11 as an upper (G) block 11 and a left (R) block 11. 1A and 1B show an example in which each block 11 is a quadrangle, the present invention is not limited to this.
For example, other shapes such as a hexagon and an octagon may be used.

FIG. 2 is a diagram for explaining a method of generating a color image using the hologram 1 in this embodiment. That is, the hologram 1, the optical circuit 3, and the light source 2 in this embodiment are prepared, and the red laser 21 and the green laser 2 of the light source 2 are prepared.
2. The laser light of each color emitted from the blue laser 23 is converted into parallel rays through the optical circuit 3. Then, the parallel rays of each color are partially scanned on the hologram 1. Regarding the irradiation timing of the laser light, first, the red laser light is emitted from the red laser 21 and is irradiated to the block 11 corresponding to the red color of the hologram 1. Then, a green laser beam is emitted from the green laser 22 and is applied to the block 11 corresponding to the green color of the hologram 1. Next, a blue laser beam is emitted from the blue laser 23 to irradiate the block 11 corresponding to the blue color of the hologram 1. By repeating this in sequence,
I try to get one color image.

Next, an example using a filter will be described with reference to FIG. That is, the hologram 1 applied in this example is one in which a plurality of blocks 11 as shown in FIG. 1 are provided with interference fringes to be irradiated with red, green, and blue laser beams, respectively. Moreover, each block of the hologram 1 is provided with a filter 4 for transmitting laser light corresponding to each color. That is, the block 4 corresponding to the red (R) color shown in FIG. 1 is provided with the filter 4 for transmitting the red laser beam, and the block 11 corresponding to the green (G) color transmits the green laser beam. A filter 4 is provided, and the block 11 corresponding to the blue (B) color is provided with the filter 4 that transmits blue laser light.

In order to obtain a color image using the hologram 1 equipped with such a filter 4, laser light of each color is simultaneously and continuously emitted from the red laser 21, the green laser 22 and the blue laser 23 of the light source 2 shown in FIG. (Scan). That is, each block 11 (see FIG. 1) of the hologram 1 is continuously irradiated (scanned) with the red laser light, the green laser light, and the blue laser light simultaneously through the filter 4. As a result, all the blocks 11 (see FIG. 1) are simultaneously irradiated with the laser light of all colors, but each block 11 is provided with the filter 4 that transmits only the laser light of the corresponding color. Therefore, the laser light of the unnecessary color is blocked by the block 11, and only the laser light of the necessary color hits the interference fringes (not shown).

For example, block 1 corresponding to the red (R) color
1 (see FIG. 1) is irradiated with the green laser light and the blue laser light other than the red laser light, but only the red laser light hits the interference fringes (not shown) by the filter 4, resulting in the red light. Will produce a color image of By using the hologram 1 provided with such a filter 4, it is possible to prevent the interference fringes recorded corresponding to each color from being irradiated with light of an unnecessary color, and suppress the occurrence of crosstalk. Moreover, since the laser light of each color can be continuously and simultaneously emitted from the red laser 21, the green laser 22, and the blue laser 23, the control circuit of the light source 2 is greatly simplified. Become.

Next, an example of giving a predetermined angle to the laser light will be described with reference to FIGS. 4 and 5. That is, in the example shown in FIG. 4, the laser light emitted from the red laser 21, the green laser 22, and the blue laser 23 in the light source 2 to the hologram 1 is at a predetermined angle. Each laser beam scans the entire surface of the hologram 1 in order from the upper left to the lower right, for example. At this time, the incident angle of the laser light incident on the surface of the hologram 1 is the hologram 1
It depends on the position on the plane. For this reason, the interference fringes (not shown) recorded on the hologram 1 are set in consideration of the incident angle (or phase) in advance.

Further, in the example shown in FIG. 5, the red laser 21 and the green laser 2 in the light source 2 are the same as in the example shown in FIG.
2. The laser beam emitted from the blue laser 23 to the hologram 1 is formed at a predetermined angle. However, as the hologram 1, interference fringes (not shown) corresponding to each color are provided for each block 11 as shown in FIG. No.) is used. In this case, as described above, each block 11 corresponding to each color is sequentially irradiated with red, green, and blue laser light to generate one color image.

As shown in FIGS. 4 and 5, by irradiating the hologram 1 with the laser light at a predetermined angle, an optical circuit for converting the laser light into parallel rays becomes unnecessary and the scanning range of the laser light is eliminated. The size of the image to be generated can be adjusted according to. That is, the scanning range of the laser beam is increased when a large image is obtained, and the scanning range of the laser beam is reduced when a small image is obtained. As described above, the size of the generated image can be adjusted by a simple configuration in which the angle of the laser light emitted from the light source 2 is adjusted.

FIGS. 6 and 7 are views for explaining an example in which the optical axes of the laser beams are made to coincide with each other. That is, FIG.
In the example shown in FIG. 7 and FIG. 7, in the case where the laser light described above is applied to the hologram 1 at a predetermined angle,
Furthermore, it is characterized in that the optical axes of the respective laser lights are matched. In the example shown in FIG. 6, each laser beam emitted from the red laser 21, the green laser 22, and the blue laser 23 of the light source 2 is emitted from the same point toward the hologram 1 via the optical circuit 3. Further, in this example, the hologram 1 provided with the filter 4 is used, so that even if the laser light of each color is continuously irradiated simultaneously, only the laser light of the required color can be irradiated to the corresponding interference fringes (not shown). Has become.

In this example, since each laser beam is applied to the hologram 1 at a predetermined angle, the interference fringes in the hologram 1 are formed in consideration of the incident angle thereof. As described above, since the optical axes of the laser beams are the same, the incident angle of the laser beam with respect to the position of the hologram 1 is the same for each color, which simplifies calculation and formation in the design of interference fringes corresponding to all colors. It becomes possible.

Further, in the example shown in FIG. 7, the hologram 1 is irradiated with light by using the three-wavelength white light source 5. Since the three-wavelength white light source 5 irradiates three wavelengths corresponding to red, green, and blue as one white light, it is an optical device for matching the optical axes of the respective laser lights as shown in FIG. There is an advantage that the circuit 3 is unnecessary. In addition, by using the hologram 1 provided with the filter 4, it is possible to continuously irradiate white light having three wavelengths, and it is possible to further simplify the configuration.

[0027]

As described above, the hologram of the present invention and the color image generating method using the hologram have the following effects. That is, the recording material is divided into a plurality of blocks on the same surface, and each of the blocks is provided with an interference fringe that is a target of irradiation of coherent light of red, green, and blue. It is possible to obtain a color image only by scanning once, and it is possible to shorten the processing time. Moreover, it is not necessary to superimpose the red, green, and blue color images generated for each block, and the device configuration can be simplified and the cost can be reduced.

Further, by providing a filter for transmitting coherent light corresponding to each color for each block, red,
It is possible to continuously irradiate green and blue coherent light beams at the same time, and it is possible to greatly simplify a mechanism such as control of laser light. Moreover, since the target interference fringes are irradiated with only the coherent light of the required color by the filter, the occurrence of crosstalk can be suppressed and the occurrence of moire and noise can be reduced. Also, by irradiating each hologram with a predetermined angle with respect to the hologram,
The range of the generated image can be adjusted by the irradiation angle of the laser light, and it becomes possible to easily deal with various sizes of the image.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an example of a hologram in (a) and (b) respectively.

FIG. 2 is a diagram illustrating a method of generating a color image.

FIG. 3 is a diagram illustrating an example using a filter.

FIG. 4 is a diagram (part 1) explaining an example in which a laser beam is angled.

FIG. 5 is a diagram (No. 2) explaining an example in which a laser beam is angled.

FIG. 6 is a diagram (No. 1) for explaining an example in which the optical axes of laser light are made coincident with each other.

FIG. 7 is a diagram (part 2) explaining an example in which the optical axes of laser light are made to coincide with each other.

FIG. 8 is a diagram illustrating a conventional example.

[Explanation of symbols]

 1 Hologram 2 Light Source 3 Optical Circuit 4 Filter 5 3 Wavelength White Light Source 11 Block 21 Red Laser 22 Green Laser 23 Blue Laser

Claims (6)

[Claims] 1. A hologram in which a recording material is provided with interference fringes for generating a predetermined image by irradiation of coherent light of red, green, and blue, the recording material being divided into a plurality of blocks on the same surface thereof. In this state, each block is provided with an interference fringe which is an object of irradiation of the red, green and blue coherent light. 2. A filter for transmitting coherent light corresponding to each color is provided for each block having interference fringes that are targets of irradiation of the red, green, and blue coherent light. The hologram according to item 1. 3. The hologram according to claim 2, which is red,
A method for generating a color image, which comprises continuously irradiating coherent light of green and blue simultaneously. 4. A method of irradiating a hologram with red, green, and blue coherent light to generate a color image, wherein the coherent light is irradiated at a predetermined angle with respect to the hologram. Color image generation method using hologram. 5. The color image generating method according to claim 4, wherein the optical axes of the coherent light beams of red, green and blue are made to coincide with each other. 6. The hologram according to claim 1, which is red,
The color image generation method using a hologram according to claim 4 or 5, wherein green and blue coherent light is emitted at a predetermined angle.