JP3372291B2 - Image reading device using hologram - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading device using a hologram.

[0002]

2. Description of the Related Art Conventionally, in an image reading apparatus for sequentially reading each color of a color image, a color filter is used and the images are sequentially replaced and read. Further, a dichroic filter is used instead of the color filter, and the image is read while sequentially replacing each color. However, the conventional color filter has a low light transmittance of about 60 to 70%, and thus the input device (camera)
The result was a drop in sensitivity. Also, due to the inherent properties of the pigment or dye used for the color filter,
Since the wavelength range to be selected is not broad and is relatively broad, the read image also has a problem in color reproducibility. Further, the dichroic filter has a high manufacturing cost and is not suitable for mass production.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an image reading using a hologram which can improve the image quality without lowering the sensitivity and can reduce the manufacturing cost is made. The purpose is to provide a device.

[0004]

According to the present invention, a reflection hologram for diffracting each color is inserted between an image receiving layer arranged at an image forming position of an image pickup lens and the image pickup lens to reflect an incident wavelength to the image receiving layer. In an image reading apparatus using a hologram that is selected by a type hologram and sequentially reads each color of a color image, the light diffracted by the reflection hologram is three colors of R, G, and B, and complementary colors that are transmitted by diffraction are used. It is characterized in that Y, M and C lights are sequentially incident on the image receiving layer. Further, according to the present invention, a reflection hologram for diffracting each color is inserted and arranged between the image receiving layer arranged at the image forming position of the image pickup lens and the image pickup lens, and the incident wavelength to the image receiving layer is selected by the reflection hologram, and sequentially In an image reading apparatus using a hologram for reading each color of a color image, two reflection holograms for diffracting each color of R, G, B are attached to the reflection hologram, or two reflection holograms are formed in one layer of a photosensitive material. It is composed by layer recording, R and B at a time,
It is characterized in that the light of each color of R, G and B which is diffracted by the group of G and R and B and G and is transmitted is sequentially incident on the image receiving layer.

[0005]

In the present invention, since each color of the color image is separated by using the hologram, the diffraction efficiency can be increased to 90% or more, and the reproduction wavelength can be set arbitrarily, so that the wavelength range to be selected is sharp. It is possible to improve the image quality. Further, regarding the duplication, if a hologram to be the original plate is produced, it is sufficient to bring the hologram recording photosensitive material into close contact with the hologram and irradiate it with coherent light under the condition of reproducing the original plate. Can be cheap. Therefore, a liquid crystal recording medium in which a transparent electrode is laminated on the image receiving layer of the image reading apparatus of the present invention to form a photoreceptor, and a transparent electrode is laminated on a polymer dispersion type liquid crystal layer in which liquid crystal is dispersed in the photoreceptor and resin. It is possible to record a color image on the liquid crystal layer by arranging the liquid crystal layer and the voltage application exposure.

[0006]

1 is a conceptual diagram showing the basic construction of the present invention. A color image of a subject is read by being formed on the image receiving layer 2 by the imaging lens 1, and the color image is read by diffracting each color by the three holographic color filters 3.

FIG. 2 is an explanatory view when a color filter made of a reflection hologram is used as the holographic color filter 3 of FIG. Holograms are recorded on the R, G, B holographic color filters 4 so as to diffract and reflect the R, G, B lights in predetermined directions. This hologram is produced, for example, by recording the interference fringes by causing the object light to be perpendicular to the hologram light-sensitive material and allowing the reference light to enter from the opposite oblique direction. When the holographic color filters of the respective colors thus produced are inserted and the image light is vertically incident, the images of the respective colors of R, G and B are formed and read on the image receiving layer 2 which is obliquely arranged as shown in the figure.

FIG. 3 is an explanatory diagram when a color filter made of a reflection hologram is used as the holographic color filter of FIG. Holograms are recorded on the R, G, B holographic color filters 5 so as to diffract and reflect the respective colors of R, G, B. For example, a sensitive material is placed on a reflection mirror to make laser light of each color vertical. It is made by making incident and recording interference fringes. When the filters of the respective colors produced in this way are inserted, the R, G, B lights are reflected and diffracted, and the Y, M, C lights of complementary colors are transmitted. A color image is read by forming an image of the transmitted light on the image receiving layer 2.

FIG. 4 is an explanatory view of a case where a reflection hologram having two layers bonded is used as the holographic color filter of FIG. For each holographic color filter 6, two layers of reflection holograms for diffracting the respective colors of R, G, and B produced by the method described with reference to FIG. 3 are stuck together, or two layers are recorded in one layer of a light-sensitive material. The color image light is reflected and diffracted by a set of R and B, a set of G and R, and a set of B and G, and as a result, images of R, G, and B colors that are transmitted are formed on the image receiving layer 2 and read.

Next, the effectiveness of the present invention will be described with reference to experiments confirmed using the optical system of FIG. 2 as an example. As a hologram photosensitive material, a photopolymer-based Omnidex 352 manufactured by DuPont is used, and as a laser, an argon ion laser manufactured by Spectra Physics, model SP-20.
20-055), output 5 W, wavelength 514 nm, 458n
m and NEC's helium neon laser, output 50m
W, 633 nm was used.

Three holograms R, G and B are used, and these holograms are sequentially replaced one by one,
Place it at the specified hologram insertion position (Fig. 2),
The G and B components are sequentially diffracted onto the image receiving layer to form an image.

The peak wavelength diffracted by each hologram is R:
It was designed and manufactured as 633 nm, G: 545 nm, and B: 458 nm.

Photographing is performed using three lasers having oscillation wavelengths corresponding to R, G, and B colors. Photosensitive material Omnidex 3
A total of three 52 are used for each wavelength. The photographing conditions of the hologram of this embodiment are as follows.

(Recording conditions) Exposure intensity: blue, green 10 mw / cm ² red 100 μw / cm ² shooting time: blue, green 3 sec red 300 sec exposure amount: 30 mj / cm ² exposure area: 2 × 2.5 inches (shooting optics) System) Object light for all R, G, and B wavelengths: f = 17.5 mm, θ = 0 ° (θ: angle with respect to optical axis) Reference light: f = 40.1 mm, θ = 30 ° (however, used during playback The image pickup lens is f = 52.5m
m) (Post-treatment conditions) UV irradiation: 10 minutes, 100 mj / cm ² heat treatment: 120 ° C., 2 hours The hologram obtained through the above steps was combined with the imaging lens, the image receiving layer, the stage for replacement shown in FIG. It was confirmed that the images could be read for each color. Further, when this system was compared with the conventional system, improvement in sensitivity and color reproducibility was recognized.

[0015]

As described above, according to the present invention, the diffraction efficiency can be 90% or more, the wavelength range to be selected can be sharpened to improve the image quality, and the mass production by reproduction can be performed. The manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a basic configuration of the present invention.

FIG. 2 is an explanatory diagram in the case of photographing with R, G, B reflected diffracted light.

FIG. 3 is a complementary color of Y, which is obtained by reflecting and diffracting R, G, and B lights.
It is explanatory drawing at the time of imaging with M and C transmitted light.

FIG. 4 shows two reflection holograms that diffract R, G, and B.
It is explanatory drawing at the time of image | photographing by the R, G, and B light which laminate | attached layers and penetrates.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Photographic lens, 2 ... Image receiving layer, 3 ... Holographic color filter, 4, 5 ... Reflective holographic color filter, 6 ... Holographic color filter which laminated two layers of reflective holograms.

Continuation of front page (56) Reference JP-A-5-45993 (JP, A) JP-A-5-80273 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G02B 27 / 00 G03G 15/01

Claims (2)

(57) [Claims] 1. An image pickup lens is arranged at an image forming position .
A reflection type hologram for diffracting each color is inserted and arranged between the image receiving layer and the image pickup lens , and the incident wavelength to the image receiving layer is reflected by the reflection type hologram.
Select the beam, an image reading apparatus using a hologram reading each color of a color image by changing sequentially the
The light diffracted by the reflection hologram has three colors of R, G, and B.
The complementary colors Y, M, and C that are transmitted by diffraction to the image receiving layer.
An image reading device using a hologram, which is characterized in that the light beams are sequentially incident . 2. The image pickup lens is arranged at an image forming position.
Reflective holographic that diffracts each color between the image receiving layer and the imaging lens
The insertion wavelength is set to reflect the incident wavelength on the image-receiving layer
Read each color of color image
In the image reading apparatus using the hologram, the reflection hologram is formed by bonding two layers of reflection holograms for diffracting each of R, G, B colors, or recording two layers in a photosensitive material of one layer, R and B, G and R at once
An image reading apparatus using a hologram, characterized in that lights of R, G, and B colors that are diffracted by a set of B and G and are transmitted are sequentially incident on an image receiving layer.