JPH0651685A - Manufacture of image hologram - Google Patents

Abstract

PURPOSE:To provide an image hologram manufacturing method capable of using scattered light as reproducing light by a simple and easy manufacturing method. CONSTITUTION:A white diffusion plate 3 and a film 4 on which a pattern is displayed are laid to overlap each other and arranged opposite to the emulsion layer surface 1b of a hologram dry plate 1a. Illuminating light is made incident on the surface of the diffusion plate 3, and the diffused light transmitted through the film is made incident on the surface of the hologram dry plate 1a as object light. The surface of the hologram dry plate 1a is irradiated with reference light from an oblique direction. This becomes a master hologram 1. The pattern is reproduced as a real image by irradiating the master hologram 1 with the phase congugate wave of the reference light which is used when the master hologram 1 is formed as the reconstructing light. The hologram dry plate 2a is arranged on the position of the actual image, or near the actual image, and then, the scattered light having a spot light source on a point P is irradiated as the reference light from the oblique direction so as to form a final hologram 2 as the image hologram.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a two-dimensional pattern image hologram used in hologram warning and the like.

[0002]

2. Description of the Related Art A hologram warning is shown in FIGS.
On the instrument panel 15 side of the vehicle,
Provided under the transparent front cover 10 of the arranged instrument panel, etc.
Due to lack of engine oil or low battery voltage.
Display 12a for warning₁~ 12a₉And usually
Is visible as a substantially transparent state. Alarm status
Then, the display 1 placed behind the front cover
2a to 12a₉Light source 13 corresponding to any of the
The corresponding display 12a through the color filter 14 or the like.
₁~ 12a₉Irradiate. Then, the table irradiated with light
Show 12a₁~ 12a ₉Is colored with a filter color
Hologram image A₁~ A₉Is reproduced as a two-dimensional pattern
It is supposed to be done. Reference numeral 11 is a meter
11a is a speedometer and 11b is a tachometer.

Generally, in the method of manufacturing an image hologram of this two-dimensional pattern, first, as shown in FIG.
The white diffuser plate 3 and the film 4 on which the pattern is displayed are overlapped and arranged so as to face the emulsion layer surface 1b of the hologram dry plate 1a. Then, the illumination light composed of parallel light is made to enter the surface of the white diffuser plate 3 substantially vertically, and the diffused light that has passed through the pattern film is made to enter the surface of the hologram dry plate 1a as object light. Similarly, the reference light composed of parallel light is emitted. In this way, a Fresnel hologram is created and used as a master hologram 1.

Next, as shown in FIG. 5 (b), the master hologram 1 is irradiated with the phase conjugate wave of the reference light at the time of creation as reproduction light to reproduce the pattern, and the pattern is reproduced at or near the position of the real image. The hologram dry plate 2a is arranged, and the reference light composed of parallel light is irradiated from an oblique direction to form the final hologram 2 which is an image hologram.

When reproducing the final hologram 2, as shown in FIG. 6, the phase conjugate wave of the reference light used when the final hologram 2 is formed is irradiated as reproduction light to reproduce the pattern.

[0006]

However, although it is preferable that the parallel light can be used as the reproduction light as described above, as shown in FIG. 7, when the divergent light which is a point light source is used as the reproduction light. As shown in FIG. 8, convergent light must be used as the reference light when the final hologram 2 is created. In this case, in order to irradiate the hologram dry plate 2a with convergent light, the hologram dry plate 2a
Optical components such as larger lenses and mirrors are required,
In the case of the hologram dry plate 2a having a large area, it is difficult to obtain these parts and it is very expensive.

It is an object of the present invention to provide a method of manufacturing an image hologram which can use divergent light for reproducing light by a simple manufacturing method.

A method for manufacturing an image hologram according to the present invention is a hologram in which a film having a pattern displayed on a diffusion plate is combined, light is radiated from the rear surface, and light transmitted and diffused through these is used as an object light. A master hologram is created by irradiating a dry plate and a reference beam from the other side, and then the master hologram is irradiated with a phase conjugate wave of the reference beam to reproduce the image of the pattern as a real image, and the reproduced real image. The final hologram dry plate is arranged in the vicinity of the above, and the display image is recorded by irradiating the final hologram dry plate with reference light composed of divergent light.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. The same members as those mentioned in the section of the prior art are designated by the same reference numerals.

FIGS. 1A and 1B show a method of manufacturing an image hologram having a two-dimensional pattern used for hologram warning and the like. First, as shown in FIG. 1A, a white diffuser plate 3 and a film 4 on which a pattern is displayed are superposed on each other and the emulsion layer surface 1 of the hologram dry plate 1a is overlapped.
It is placed facing b. Then, the illumination light composed of parallel light is incident on the surface of the white diffuser plate 3 substantially vertically, and the diffused light transmitted through the pattern film is used as the object light.
The hologram dry plate 1a surface is irradiated with the reference light which is also a parallel light from the oblique direction while being incident on the surface. In this way, a Fresnel hologram is created and used as a master hologram 1. Up to this point, it is the same as the conventional case.

Next, as shown in FIG. 1 (b), the master hologram 1 is irradiated with the phase conjugate wave of the reference light at the time of preparation as reproduction light to reproduce the pattern, and the pattern is reproduced at or near the position of the real image. The hologram dry plate 2a is arranged, and divergent light having a point P as a point light source is irradiated as a reference light from an oblique direction to form a final hologram 2 which is an image hologram.
To create.

When reproducing the final hologram 2, as shown in FIG. 2, the reproducing light which is divergent light is irradiated from the point P where the reference light is irradiated when the final hologram 2 is formed. When a three-dimensional object is image-hologramd by this method, the concavo-convex is reversed during reproduction (pseudosc
However, there is no unevenness in the two-dimensional pattern, so there is no problem. However, since the front and back (right and left) of the image are reversed from those reproduced by the conventional method, it is necessary to pay attention to the direction of the pattern when the master hologram 1 is created.

By using the manufacturing method according to this embodiment, it is possible to manufacture an image hologram whose reproduced light is divergent light without using expensive optical parts such as lenses. Also,
Since the reproduced light at the time of reproducing this image hologram may be divergent light, the optical system can be designed more easily than before, and thus the image hologram manufactured by this method can be widely used for hologram warning display of vehicles. Become.

[0013]

As described above, according to the present invention,
An image hologram whose reproduction light is divergent light can be manufactured without using an expensive optical component such as an expensive lens, and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is an embodiment of a method of manufacturing an image hologram according to the present invention, in which (a) is a method of manufacturing a master hologram;
(B) is a figure which shows the manufacturing method of a final hologram.

FIG. 2 is a diagram showing a method of reproducing an image of an image hologram manufactured by the method of FIG.

FIG. 3 is a front view of an instrument panel on which a hologram warning is arranged.

4 is a side view of the instrument panel shown in FIG. 3 incorporated into an instrument panel surface.

5A is a diagram showing a method for producing a master hologram for hologram warning, and FIG. 5B is a diagram showing a method for producing a final hologram.

FIG. 6 is a view for reproducing the image hologram manufactured by the method shown in FIG.

FIG. 7 is a diagram illustrating a reproduction state of an image hologram when reproduction light is divergent light.

FIG. 8 is a diagram illustrating that the reference light must be a convergent light when the image hologram for reproduction by the method shown in FIG. 7 is manufactured as a final hologram.

[Explanation of symbols]

 1 Master Hologram 1a Master Hologram Dry Plate 2 Final Hologram 2a Final Hologram Dry Plate 3 White Diffuser 4 Film

Claims (1)

[Claims] 1. A master hologram in which a film having a pattern is displayed on a diffusion plate is combined, light is radiated from the back side, and light transmitted and diffused through these is radiated as object light to a hologram dry plate, and reference light is radiated from the other side. Then, the master hologram is irradiated with a phase conjugate wave of the reference light to reproduce the image of the pattern as a real image, and a final hologram dry plate is arranged in the vicinity of the reproduced real image and the final hologram dry plate is formed. A method of manufacturing an image hologram, characterized by irradiating a reference image composed of divergent light to record a display image.