JPH0451139A - Exposure device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an exposure apparatus equipped with a color filter for enhancing a desired color when exposing a photosensitive recording medium to light reflected from an original.

[Conventional technology]

Conventionally, an exposure device irradiates light onto a document placed on a document platen glass, and the photosensitive recording medium is exposed to the reflected light.
This photosensitive recording medium and recording paper are combined and pressure developed,
Copying machines that copy the original onto this recording paper are known. The exposure device used in this copying machine was simplified and
As shown in the figure. Reference numeral 101 indicates an original placed on an original table glass, and this original 101 is moved in the direction of arrow A. An original 101 placed on the original table glass is irradiated with light from a light source 102, and the light reflected by the original 101 has image information, and this reflected light moves the photosensitive recording medium 103 in the direction of arrow B. exposed to light. A lens 104 is provided between the photosensitive recording medium 103 and the original 101 to form an image of the reflected light onto the photosensitive recording medium 103. Furthermore, a cyan (blue-green) filter 105, a magenta (reddish-purple) filter 106, and a yellow (yellow) filter 107 are disposed between the lens 104 and the photosensitive recording medium 103. These color filters 105
106 and 107 from the lens 104 to the photosensitive recording medium 103
It is inserted into the optical path up to the point where the desired color is emphasized.

Here, when trying to emphasize green color to which human visual perception is highly sensitive in an exposure apparatus equipped with such yellow, magenta, and cyan color filters 105, 106, and 107, yellow filter 107 and cyan filter 1 are used.
05 was done by subtractive color mixing. However, in this case, there is no problem if the yellow filter 1.07 and cyan filter 105, which have ideal colors, are used, but since these filters 105 and 107 have some color shift, if subtractive color mixing is performed, There is a problem in that the color shift becomes larger, making it difficult to reproduce desired colors.

On the other hand, a device that is equipped with a color filter 4 of R-G-B, which is the three primary colors of light, and performs divided exposure three or four times has less color shift and solves the above-mentioned problems, but the exposure process There is a problem in that the processing time for image exposure becomes longer.

Therefore, as shown in FIG. 5, a method of performing color correction using a color filter based on the opposite color theory instead of using the color filter based on the three primary color theory can be considered. In other words, the color filters are four filters 111 each having a transmittance peak for red, green, yellow, and blue components.
, 112°, 113.114, so that opposite colors of the four colors are not inserted into the optical path at the same time.

When performing color enhancement in this exposure apparatus, each filter 111, 112, 113, and 114 is inserted into the optical path to perform color enhancement of red, green, yellow, and blue.

This color correction can satisfactorily reproduce colors such as green, which is easily perceived by humans, as well as blue, red, and yellow, which are easily recognized by ordinary people.

Note that the opposite color logic will be explained with reference to FIG.

By setting the color wheel with red in the middle direction of the y-axis, green in one direction, yellow in the middle direction of the y-axis, and blue in one direction, and brightness in the two-axis direction, CIE (International Commission on Illumination) It is possible to make the color system similar to the Lab color system (uniform perceptual color space defined by CIE), and it is possible to express all colors.

By the way, in such a conventional exposure apparatus, the red filter 111 and the green filter 112 are set as a set, and the yellow filter 113 and the blue filter 114 are set as a set, and the light path 115 is If you try to mix colors by inserting them into the photosensitive recording medium 103, the desired color may not be obtained according to the theory of subtractive color mixing, or the reflected light cannot pass through the overlapped parts, and the color of the photosensitive recording medium 103 may not be the same. Change will no longer occur.

Therefore, the red filter 111 and the green filter
One set of yellow filter 112 and one set of yellow filter 113 and blue filter 114 are arranged so as to face each other with respect to optical path 115.

[Problem to be solved by the invention]

However, in the exposure apparatus as shown in FIG. This color filter 111, 112, 113
, 114 spreads out from side to side in the figure with respect to the optical path 115, which poses a problem in that the exposure apparatus using these color filter units becomes larger.

The present invention houses a color filter unit on one side of the optical path,
The purpose of the present invention is to provide a compact exposure device.

[Means to solve the problem]

In order to achieve such an object, the present invention includes a light source that irradiates light onto a document placed on a document platen glass, and a lens that focuses reflected light from the document onto a photosensitive recording medium. In the exposure apparatus, a blue diffusion plate insertable into the optical path from the light source to the lens is disposed on one side of the optical path, and a yellow filter insertable into the optical path from the lens to the photosensitive recording medium. is arranged on the -blade side,
A red filter and a green filter are arranged on the photosensitive recording medium side from the yellow filter and on the -blade side.

[Effect]

When it is desired to emphasize the image information formed on a photosensitive recording medium in blue, a blue diffusion plate is inserted into the optical path, and the light from the light source is reflected by the blue diffusion plate, so that the image information is emphasized in blue. Next, when it is desired to emphasize the image information in another color, a yellow filter, a red filter, and a green filter are appropriately inserted into the optical path, and the image information is emphasized in the desired color.

In this way, by appropriately inserting the blue diffuser plate, yellow filter, red filter, and green filter arranged on one side of the optical path into the optical path, the image information on the photosensitive recording medium can be emphasized in the desired color. I can do it.

〔Example〕

Hereinafter, the present invention will be explained based on the drawings. 1 to 3 are diagrams showing an embodiment of an exposure apparatus according to the present invention.

FIG. 1 is a diagram showing a copying machine using this exposure apparatus, and this copying machine will be explained first.

In this copying machine 40, the top plate portion is formed of a document table glass (hereinafter referred to as glass) 2 and a document table cover (hereinafter referred to as cover) 1 which are movable in the left and right direction.
A desired original is placed face down on top. A light source 3 is fixed to the upper right side of the copying machine 40 in a direction perpendicular to the moving direction of the glass 2, and the light source 3 is housed in a casing 31. A slit 32 is formed on the top surface of the casing 31 toward the glass 2, and the light from the light source 3 passes through this slit 32.
Line-shaped light is irradiated toward the glass 2 through the glass. Therefore, the light from the light source 3 sequentially illuminates the entire surface of the glass 2 from the left end to the right end by moving the glass 2 in the left-right direction.

The light irradiated by the light source passes through the transparent glass 2 and is reflected by the placed original. The reflected light from the original enters the lens 5. The light condensed by the lens 5 passes through the color filter unit 4 and is reflected by two reflecting mirrors 6, and the direction of this reflected light is changed by the two reflecting mirrors 6 and is closely directed below the exposure table 7. An image is formed on microcapsule paper 22 as a photosensitive recording medium.

The elongated microcapsule paper 22 is stored in a removable cartridge 23, and after being guided by various rollers and passing under the exposure table 7, it is supplied to the pressure developing device 8. After that, the microcapsule paper 22
is guided to a peeling roller 11 and a meandering adjustment roller 12, and then wound onto a winding shaft 13.

At the bottom of the copying machine 40, a developer paper cassette 19 containing developer paper 21, which is a recording paper made of plain paper, is arranged. transported. Therefore, the microcapsule paper 22 and the color developing paper 21 are supplied to the pressure developing device 8 in a superimposed state. The microcapsule surface of the microcapsule paper 22 on which the latent image is formed and the developer-coated surface of the color developer paper 21 are inscribed together and sandwiched between the small diameter roller 9 and the backup roller 18 and pressurized. This pressurization destroys the unexposed microcapsules and forms an image on the color developing paper 21.

The microcapsule paper 22 and the color developer paper 21 that have come out of the pressure developing device 8 are conveyed by a paper feed roller 10, and then transferred to a peeling roller 1.
1, the microcapsule paper 22 is placed upward, and the color developer paper 21
are orthogonally separated. The separated microcapsule paper 22 passes through a meandering adjustment roller 12 and is wound around a winding shaft 13. The color developer paper 21 is accelerated in color development by the heat fixing device H to form an image, and is then conveyed to the paper discharge tray 14 .

The heat fixing device H is a hollow heat roller 1 with a built-in heater 17.
6, a color developing paper feed roller 15, and the like.

FIG. 2 shows a simplified exposure device 41 used in this copying machine 40. As shown in FIG. A document 33 is placed on the glass 2,
This document 33 is moved in the direction of arrow A. The original 33 placed on the glass 2 is irradiated with light from the light source 3, and the original 33 is placed on the glass 2.
The reflected light reflected by 3 has image information,
The microcapsule paper 22 is exposed to the reflected light while moving in the direction of arrow B. Microcapsule paper 22
A lens 5 for forming an image of the reflected light on the microcapsule paper 22 is disposed between the document 33 and the original 33. A blue lens 5 is provided between the lens 5 and the slit 32 and on one side of the optical path 34. A diffuser plate 35 is provided, and this blue diffuser plate 35 can be inserted into the optical path 34 by a moving means (not shown). Further, a yellow filter 36 is disposed on one side between the lens 5 and the microcapsule paper 22, and a red filter 37 and a green filter 38 are arranged in order from the yellow filter 36 to the microcapsule paper 22 side. The color filters 36, 37, 38 can each be inserted into the optical path 34 by means of displacement means (not shown).

Next, the effect will be explained.

Light emitted from the light source 3 passes through the slit 32 and illuminates the original 33 on the glass 2, and is reflected by the original 33. The light reflected by the original 33 has image information, and is imaged on the microcapsule paper 22 through the lens 5, thereby exposing it to light.

Here, when trying to emphasize the image information imaged on the microcapsule paper 22 in blue, the blue diffusion plate 35 is moved toward the slit 32, and this light is inserted into the optical path 34 from the light source 3 to the document 33. Part of the blue diffusion plate 35 is inserted.

Then, a part of the light emitted from the light source 3 is reflected by the blue diffusion plate 35, and the reflected blue light having no image information passes through the lens 5 and is emitted onto the microcapsule paper 22. Since the microcapsule paper 22 is exposed while moving in the direction of arrow B, the blue reflected light can emphasize the image information formed on the microcapsule paper 22 in blue.

Next, when you want to emphasize the image information formed on the microcapsule paper 22 in other colors, the color filters 36 and 37
．． 38 is appropriately inserted into the optical path 34 from the lens 5 to the microcapsule paper 22.

For example, when it is desired to emphasize the image information formed on the microcapsule paper 22 in yellow-green, the yellow filter 35 is deeply inserted into the optical path 34 as shown in FIG.
38 is inserted shallowly into the optical path 34. When the yellow filter 36 and the green filter 38 are inserted at different levels in this way, there is a part A where the yellow filter 36 and the green filter 38 are inserted in an overlapping manner, and a part B where only the yellow filter 36 is inserted.
and a portion C in which the filters 36 and 38 are not inserted. Part C of the optical path 34 is exposed to white, and part B is exposed to yellow. However, in part A, the yellow filter 36 and the green filter 38 are inserted overlapping each other, so that the difference between these filters 36 and 38 is Colors will be mixed, and there is a possibility that the desired green color will not be obtained by the subtractive color mixing method.

However, since the yellow of the yellow filter 36 is a combination of red and green, in part A of the optical path 34, the blue component light is first blocked by the yellow filter 36 and emphasized as yellow; The red component of the light is blocked by the green filter 38, leaving only the green component, resulting in exposure of only green.

Since the portion B of the optical path 34 is exposed to yellow and the portion A is exposed to green, image information in which yellow-green is emphasized is obtained.

Also, if a red filter 37 is inserted in the optical path 34 instead of the green filter 38, part A will be exposed to only red color, and part B will be exposed to yellow color, so image information with enhanced skin tone can be obtained. . Note that since the red filter 37 and the green filter 38 have opposite colors, they are not inserted into the optical path 34 at the same time.

In this way, by appropriately inserting the blue diffusion plate 35, yellow filter 36, red filter 37, and green filter 38 arranged on one side of the optical path 34 into the optical path 34, the image information on the microcapsules 22 can be Can be highlighted in desired color.

〔Effect of the invention〕

As explained above, according to the present invention, a blue diffusion plate that can be inserted into the optical path from the light source to the lens is disposed on one side of the optical path, and a blue diffusion plate is provided in the optical path from the lens to the photosensitive recording medium. An insertable yellow filter is disposed on the one side, and a red filter and a green filter are disposed on the photosensitive recording medium side from the yellow filter, so that the yellow filter, the red filter, and the green filter are disposed on the one side. A color filter unit consisting of the above color filter unit can be housed on one side of the optical path, and an exposure apparatus using this color filter unit can be downsized.

38...green filter

Claims (1)

[Claims] In an exposure apparatus equipped with a light source that irradiates light onto a document placed on a document platen glass, and a lens that images reflected light from the document onto a photosensitive recording medium, there is a light beam in the optical path from the light source to the lens. An insertable blue diffuser plate is disposed on one side of the optical path, and a yellow filter insertable into the optical path from the lens to the photosensitive recording medium is disposed on the one side, and from the yellow filter to the photosensitive recording medium. An exposure apparatus characterized in that a red filter and a green filter are disposed on one side of the medium.