JPH0419730A - Exposing device - Google Patents

Abstract

PURPOSE:To improve coloring by the color correction of green, etc., without carrying out a divided exposure by providing four pieces of color correcting filter having red, green, yellow, and blue components and the peaks of transmitivities, respectively, and preventing four opposite colors from being inserted into an optical path at the same time. CONSTITUTION:The color correcting filter is composed of four pieces of filters 4a - 4d, having the red, green, yellow, and blue components and the peaks of the transmitivities, respectively. When the color corrections of each color are carried out, respective filters 4a - 4d are inserted into the optical path to carry out the corrections of the red, green, yellow, and blue. On the other hand, two arbitrary filters or one filter among the red, green, yellow, and blue, are selected, so that an arbitrary color except the opposite color can be emphasized. Thus, the color reproduction of the green which is easily perceived by a human being, first, and the blue, red, and yellow which are easily recognized by an ordinary person can be excellently carried out.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to color correction for transmitting image information of a document to a photosensitive recording medium using light and performing arbitrary color correction on the optical path of the transmission. The present invention relates to an exposure apparatus equipped with a filter.

[Conventional technology]

FIG. 4 is a schematic cross-sectional view of a conventional photosensitive and pressure-sensitive copying machine (hereinafter referred to as a copying machine) capable of making full-color copies. Note that photosensitive paper (microcapsule paper) that can be used in this copying machine has been proposed in Japanese Patent Laid-Open Publication No. 88739/1983.

The copying machine 40 has a top plate that includes a document table glass (hereinafter referred to as glass) 2 that can be moved in the horizontal direction and a document table cover (
Hereinafter referred to as the cover. ) 1, and a desired original is placed face down on the glass 2. 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 irradiates linear light toward the glass 2. 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 is passed through filter 4.
passes through and enters lens 5. The light condensed by the lens 5 is condensed by two reflective mirrors 6. The direction of the light condensed by the two reflective mirrors 6 is changed by the two reflective mirrors 6, and an image is formed on the microcapsule paper 22 closely positioned below the exposure table 7. .

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.

Next, an explanation will be given with reference to FIG. 3, which briefly shows an exposure device in this image forming apparatus. The document P is placed on a moving means so as to be moved from left to right, and a light source 3 and a lens 5 are placed below it.

Above the lens 5 are a filter (cyan) 103, a filter (magenta) 104, and a filter (yellow) 105.
It is arranged together with an insertion means that can be inserted into the optical path f at a position where it does not enter the optical path f.

Further, below the lens 5, a photosensitive recording medium 22 is arranged together with a moving means so as to move from right to left.

And filter lO3, filter 104, filter 1
05 is composed of three filters that have transmission characteristics for the three primary colors: cyan, magenta, and yellow.

According to the exposure apparatus configured in this way, the document P is scanned in the scanning direction indicated by the arrow in the figure, and at the same time,
The photosensitive recording medium 22 is scanned in the direction of the arrow. In the meantime, filters 103, 104, and 105 are appropriately inserted into the optical path f to perform color correction.

Color correction is performed based on color shifts in dyes that reproduce colors, differences in spectral sensitivity of photosensitive media and spectral characteristics of output dyes, and user preferences.

[Problem to be solved by the invention]

However, when attempting to emphasize green, to which human visual perception is sensitive, using conventional exposure equipment using yellow, magenta, and cyan color correction filters, yellow and cyan were subtractively mixed.

In this case, there will be no problem if ideal yellow and cyan are used, but there will be some color shift, so if subtractive color mixing is performed, the color shift will become even larger, making it difficult to reproduce the desired color. There's a problem.

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

The present invention was made in view of the problems of the prior art as described above, and its purpose is to provide an exposure device that can produce good colors by color correction such as green without performing divided exposure. It is about providing.

[Means to solve the problem]

The exposure apparatus of the present invention having the above object irradiates a document with light from a light source, irradiates the transmitted light or reflected light onto a photosensitive recording medium to form a latent image, and is arranged in the optical path of the photosensitive medium from the light source. In an exposure apparatus that is equipped with a color correction filter that performs color correction depending on the amount of insertion of the color correction filter into the optical path, the color correction filter has transmittance peaks for each of the red, green, yellow, and blue components. It has two filters so that opposite colors of the four colors are not inserted into the optical path at the same time.

[Effect]

The color correction filter of the present invention having the above configuration is composed of four filters each having transmittance peaks for red, green, yellow, and blue components. When performing color correction for each color, each filter is inserted into the optical path to perform color correction for red, green, yellow, and blue. Further, by selecting any two or one filter from red, green, yellow, and blue, any color other than the opposite color can be emphasized.

As a result, colors such as green, which is easily perceived by humans, as well as blue, red, and yellow, which are easily recognized by ordinary people, can be well reproduced.

〔Example〕

An embodiment embodying the present invention will be described below with reference to the drawings. Referring to FIG. 1, an original P is placed above the light source 3, a lens 5 and color correction filters 4a to 4d are placed below the original P, and further below the lens 3 and the color correction filters 4a to 4d. A photosensitive medium 22 is placed at. In accordance with the theory of opposite colors, the color correction filters 4a to 4d are arranged in pairs of red and yellow, and of green and blue, facing each other so that opposite colors are not subjected to color correction at the same time. This arrangement is not based on the theory of the three primary colors of color or light, but on the theory of opposite colors. Here, the filter 4a is a red filter, the filter 4b is a green filter, the filter 4C is a yellow filter, and the filter 4d
are blue filters, each of which is mounted so as to be movable in the direction perpendicular to the optical path f. The red filter 4a, one of the yellow filter 4C, and the blue filter 4d may be inserted alone or in arbitrary combinations into the optical path f. At the same time, either one of the green filter 4b, the yellow filter 4C, and the blue filter 4d is inserted singly or any two thereof into the optical path f.

Next, the opposite color logic will be explained in detail with reference to FIG.

By setting the color wheel with red in the child direction of the X axis, green in one direction, yellow in the child direction of the y axis, and blue in one direction, and the brightness in the two axis directions, CIE (Commission Internationale de Illumination) L set by
It is possible to make it similar to the ab color system (uniform perceptual color space defined by CIE), and all colors can be expressed.

In other words, any color can be emphasized by selecting any two or one filter.

Furthermore, the red filter 4a, the green filter 4b, the yellow filter 4C, and the blue filter 4d are not inserted into the optical path at the same time, so that color mixing does not occur and vivid colors can be reproduced.

Next, the operation of the exposure apparatus having such a configuration will be explained. The light emitted from the light source 1 is reflected by the document P, and the reflected light having image information is imaged onto the photosensitive medium 22 using the lens 5, so that the image information of the document P is transmitted onto the photosensitive medium 22.

Note that the color correction filters 4a to 4d arranged in the optical path f
By inserting a fluorescent light into any fluorescent path 6, a desired color can be emphasized.

For example, when trying to emphasize the red of the image as a whole, the red filter 4a is inserted into the optical path f by a predetermined amount. Further, when trying to emphasize green, a green filter 4b is inserted into the optical path f depending on the degree of emphasis.

Further, for example, when it is desired to emphasize cyan color, a green filter 4b and a blue filter 4d are inserted into the optical path f depending on the degree of emphasis desired from both sides.

As mentioned above, the red filter 4a and the green filter 4b, the yellow filter 4C, and the blue filter 4d of opposite colors are
Since they are not inserted into the optical path f at the same time, color mixing does not occur and vivid color reproduction is possible.

In this embodiment, the red filter 4a, the green filter 4b,
Although the yellow filter 4C and the blue filter 4d have been described mainly in the case where they are arranged below the lens 5, they may be arranged above the lens 5.

〔Effect of the invention〕

As detailed above, according to the present invention, the color correction filter has four filters each having a transmittance peak for red, green, yellow, and blue components, and opposite colors are simultaneously inserted into the optical path. Therefore, color mixing does not occur during color correction, making it possible to reproduce vivid colors.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an exposure apparatus of the present invention, and FIG. 2 is a
FIG. 3 is an explanatory diagram showing a virtual color system using opposite colors, FIG. 3 is an explanatory diagram of an exposure apparatus according to the prior art, and FIG. 4 is a schematic configuration diagram of an image forming apparatus according to the prior art. 4a...Red filter, 4b...Green filter, 4c...
... Yellow filter, 4d... Blue filter, 5... Lens, 2... Photosensitive paper, P... Original.

Claims (1)

[Claims] A document is irradiated with light from a light source, the transmitted light or reflected light is irradiated onto a photosensitive recording medium to form a latent image, and a color correction filter is provided in the optical path from the light source to the photosensitive medium.
In an exposure apparatus that performs color correction depending on the amount of insertion of a color correction filter into an optical path, the color correction filter has four filters each having a transmittance peak for red, green, yellow, and blue components, and An exposure apparatus characterized in that four opposite colors are not inserted into an optical path at the same time.