JPH05297563A - Contact exposing device - Google Patents

Abstract

PURPOSE:To assure the contact flatness between an original and a photosensitive material with the contact exposing device by superposing the photosensitive material and the original on each other, putting a transparent cover sheet thereon and squeezing the sheet to expel the internal air and further, applying a suction thereto. CONSTITUTION:The squeeze roller 276 of the contact exposing device which positions the photosensitive material and the original on the exposing surface on a photosensitive material tray in order to maintain the contact flatness, puts the cover sheet thereon and maintains the contact flatness by squeezing and sucking the cover sheet is constituted into double structures consisting of a sheet material 276A and a soft material 276B so that, even if the exposing surface of the photosensitive material tray is slightly deformed to the loss of the flatness, the squeezing is smoothly executed in adaptation thereto. The contact flatness of the three; the cover sheet, the original and the photosensitive material, is thus surely maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention accurately mounts color-separated printing original films (hereinafter sometimes referred to as "separated halftone originals or separated halftone original films") at predetermined positions to form a positive or negative type. A color for direct visual inspection of the presence or absence of abnormalities in the separated mesh original for making a printing plate by exposing the color photographic light-sensitive material to multiple exposures once for each original and creating a color image with the same color scheme as the print finish. The present invention relates to a contact exposure apparatus that creates a proof.

[0002]

2. Description of the Related Art Conventionally, an exposure apparatus irradiates a surface of an original with light from a light source to form an image on a photosensitive material with a projection lens having a function of enlarging, reducing, or equalizing, and a method of superposing the original and the photosensitive material. There is a method of irradiating light from a light source to perform contact exposure.

Further, although there are scanning exposure and static exposure as means for irradiating the light from the light source, the former can realize a compact exposure apparatus with a relatively small light source, whereas the latter generally uses a light source with relatively high brightness. In order to obtain parallelism and uniformity of light, the distance from the light source to the exposure surface is set, so that the exposure apparatus becomes a large size.

In the field of printing plate making, a large amount of film is used in the process from the continuous tone image of reversal film, color negative film, color paper, etc. to the production of a printing plate composed of halftone dots. , Color sorting, image composition, etc. Therefore, the work becomes complicated, and many mistakes such as mistakes in characters and layout occur. In addition, the characters (price, etc.) such as price changes, layout changes, color changes, etc. from the client (orderer) are often mixed up, and it is easy to forget to fix them. It is also necessary to check in advance whether the printed matter will have the desired color tone and gradation. These are collectively called calibration.

For this reason, various systems other than test printing called proof printing have been announced and sold for the purpose of confirming these. For example, a CRT is used, a photopolymer, a non-silver photosensitive material such as diazo is used, an image is formed with a dry toner, and an electrophotographic method is used. However, these calibration systems generally require a long time to raise one calibration sheet, and have problems such as high material cost and poor workability, so that they cannot be practically sufficient systems. On the other hand, as another method of obtaining a proof, there is a method of printing a decomposed halftone original on a color light-sensitive material using color separation light. For example, JP-A-62-280746, JP-A-62-280747,
62-280748, 62-280749, 62-280750, 62-
No. 280849, No. 60-42760 and the like describe a method of obtaining a proof on a color light-sensitive material in a photographing system using a projection lens. Although these are large-scale equipment, they are so-called "bright room specifications" that can be used in ordinary rooms, and the exposure operation must be performed in a dark room while the photosensitive material itself is held in the equipment. Instead, it can be done under normal light. Therefore, it is possible to easily and inexpensively perform color calibration, and it has characteristics superior to those of other calibration systems. However, since it is an image pickup system, the flare of the lens and the like occur, and the gradation reproducibility is deteriorated. That is, due to flare and the like, the small dots of the net tended to fly and the large dots tended to collapse.

On the other hand, as another method for obtaining a proof (color proof) similarly from a color light-sensitive material, Chesley F.
Carlson Company from The Carlson ProofmasterSystem,
There is a contact exposure type such as that sold by Kreonite, Inc. under the name Color Proofing System. Since these are methods of exposing the separated half-tone original to the color light-sensitive material directly, the gradation reproducibility is greatly improved as compared with the photographing method. On the other hand, since the color photographic light-sensitive material has a light-sensitive area in the entire visible region, it cannot be handled in a bright room, and it has a drawback that it requires a fumbling work in a dark room.

[0007]

As described above, the gradation reproducibility of the disassembled halftone original is better in the contact method than in the photographing method.

In order to achieve this by static exposure, a large-sized light source device is required, which increases the installation space of the device and makes handling difficult. The light source can be small in size if uniform slit light is scanned so that the entire surface of the image forming area to be contact-exposed is uniformly exposed so that the entire surface is exposed.

[0009] Usually, in a scanning exposure apparatus such as a copier, the parallelism and uniformity of light are not so important.
On the other hand, reproduction of halftone is an important issue in a device for producing a color proof using a separated halftone original in the field of printing plate making. If the small dots fly or the large dots get crushed, it will be difficult to fully understand the gradation of the separated mesh original on the proof, and it will be necessary to check it again on the film. Not only does it take time, but it also becomes extremely difficult to accurately grasp image reproducibility and color reproducibility due to color mixture.

Further, in the case of color separation exposing a negative separation halftone original onto a negative color photosensitive material, one original film may be brought into close contact with the photosensitive material, but a positive separation halftone original is colorwise exposed onto a positive color photosensitive material. In this case, at least two decomposed mesh films, one of color plates (yellow (Y), magenta (M), cyan (C) plate) and black (BK) plate, must be adhered to the photosensitive material. For this reason, one of the two decomposed mesh films is exposed on the photosensitive material through the base thickness of one sheet. Further, in the case of exposing a positive decomposition mesh film for a printed matter in which printing with a special ink called a special color simultaneously occurs, it is necessary to expose two or more decomposition mesh films at the same time. In these systems, the parallelism and uniformity of light have a great influence on the reproducibility of the image, and when these are insufficient, sufficient image reproducibility cannot be obtained even with contact exposure. That is, the fringes appear on the reproduced halftone dots, and the halftone dots are crushed or thinned, and partial fog is generated, resulting in deterioration of image quality.

In addition, it is most important that the decomposed mesh original film and the photosensitive material are in close contact with each other to maintain the flatness. Therefore, the transparent cover sheet is covered, and the inside of the covered region is sucked and decompressed to obtain the flatness. It is being put out.

However, the photosensitive material placing table and the original table are aligned so as to be substantially on the same plane, and the decomposed net original and the photosensitive material are covered with a transparent cover sheet and squeezed with a squeeze roller to squeeze the cover sheet and the photosensitive material. Suction pressure is applied after the air between the table and the mounting table has been almost expelled, and the air in the cover sheet is completely evacuated so that the original and the photosensitive material in the cover sheet come into close contact with each other. If the flatness is poor and the squeeze roller is made of a material with high rigidity, the roller will not touch the photosensitive material mounting table correctly, creating a gap and raising the pressure, and decompressing in a state where the air cannot be completely expelled. Become. In such a case, wrinkles will form on the cover sheet surface, air will be trapped between the wrinkles, and the original and the sensitive material will be distorted in the same manner, and the overlapping of images by the disassembled original will also be distorted. , The correct color proof cannot be obtained, and blurring, bleeding, or color shift occurs.

The defective flatness of the photosensitive material mounting table is caused by a warp that occurs during processing or a deflection due to the weight of the exposure table. In addition, the squeeze roller is a hard NBR
Since solid rollers such as the above are used, the adhesion with the photosensitive material mounting table or the document table that forms the exposure surface cannot be obtained, and floating occurs.

It is desirable to use a contact exposure apparatus that can obtain stable and good adhesion even if the flatness is a little poor.

The present invention solves the above problems and provides a small contact exposure apparatus capable of forming an image with high halftone dot reproducibility, that is, gradation on a halftone original, and easy and reliable operation in a bright room. Aim to do.

[0016]

The object of the present invention is to position the document by positioning it by fitting the pin hole of a document film having a positioning pin hole into a pin of a pin bar fixed on the document table. After positioning and fixing the photosensitive material processed into the size on the photosensitive material mounting table, the respective mounting surfaces of the original table and the photosensitive material mounting table are made substantially the same surface and covered with a cover sheet, The process of squeezing the cover sheet surface with a squeeze roller, depressurizing the inside of the cover sheet, and then performing exposure is repeated on the same photosensitive material. In the contact exposure apparatus, the material of the squeeze roller is a double structure of a sponge material, a soft substance of liquid and gas, and a sheet material on the surface covering them. It is achieved Te.

[0017]

1 is a front view of FIG. 1, a side view of FIG. 2, a top view of FIG. 3, a partial sectional view of FIG. 4, an exposure unit and a squeeze roller of FIG. 2, which is a partially enlarged view of FIG. 2, and FIG. 6, which is a partially enlarged view of the photosensitive material on the photosensitive material mounting table, the original document, the cover sheet, and the squeeze roller configuration diagram of FIG. To do. However, the present invention is not limited to this embodiment.

The color proof producing device is of Y plate, M plate, C plate.
Before making a production printing plate using each separated mesh original film that has been color-separated into plates and black plates, check whether the layout of the original film is correct, there is no difference in color, there is no error in the characters, etc. A device for obtaining a proof (color proof) for inspecting and confirming the finish of printed matter in advance. It corresponds to the original film by positioning one or more of the above decomposition mesh film and overlaying it on the color photosensitive material. By creating a proof (color proof) using a color photosensitive material by sequentially exposing the separated color light in contact with each other, the error of the separated halftone original is detected and the printing finish is confirmed in advance, and the correction of the halftone original is returned. It was designed so that work could be done.

The main body 100 has an upper surface 141 and a lower surface 142 for mounting a pin bar 143 having registration pins (pins) 143A for positioning the originals on the upper side of the main body frame 101 supported by the legs 102. Having a platform 140,
A light-shielding cover 120 capable of forming a dark room as a first chamber is provided on the upper part thereof so as to be opened and closed by a hinge 121 and a gas damper 122.

An exposure section 300 for scanning and exposing the contact exposure surface of the document table is provided in the first chamber. A single or plural (three in the embodiment) tubular light source lamps are provided in the central portion of the exposure section.
302A, 302B, 302C are provided so as to be surrounded by a drum-shaped inner reflecting mirror 306 fixed to a housing 316 and a transmission window 304. A polygonal cylinder 301 is concentrically provided on the outer side of the central part and has blue (B), green (G), red (R), gray (ND) on each cylinder surface
Are arranged so as to be rotatable, and the filter surface and the transmission window face the contact exposure surface. The shielding plate 308, the rotary solenoid 312 for operating the shielding plate 308, the exposure window or slit 310, and the honeycomb board 342 mounted and fixed to the light source side of the slit are fixed to the holding frame 341 provided with a housing 316. It is stored in.

The exposure unit 300 is capable of running on the rails 317A and 317B for scanning.

Therefore, it is necessary to reduce the influence of the diffused light as much as possible by narrowing the light collimated by the light diffusing plate by a slit. Therefore, the honeycomb board must always be located on the opposite side of the slit from the photosensitive material. Further, the honeycomb board may be held in contact with the slit or may be held apart therefrom, but it is preferable to keep a certain distance from the photosensitive material. The distance between the honeycomb board and the photosensitive material is 30 mm or more. It is preferable that the slit is thin so as to suppress the influence of diffused light, and the preferable slit width is less than 30 mm.

Inside the main body frame 101, a sensitive material mounting portion 200 is provided as a second chamber. And the sensitive material mounting table 201
Is driven by a motor (not shown) so that it can move up and down.

On the other hand, the light-shielding curtain 240 is affixed to the link attachments 247 of the chain 246 which travels symmetrically on both sides, and is affixed to the bars 249 which are held by both ends and are provided at equal intervals.
The front end and the rear end of the curtain are the leading rods 24 of the rods, respectively.
9A and the tail rod 249B are fixedly attached with an adhesive or a screw 249C. By the way, in the present embodiment, the light-shielding curtain was made of tetron cloth as a core material and the surface of which was coated with a nitrile rubber resin. This light-shielding curtain is slightly stretchable, and sufficiently absorbs the phenomenon that the curtain orbit is slightly longer while the curtain is passing through the sprocket 241, thereby smoothing the operation. The light-shielding curtain 240 has an area at least larger than the cross section of the moving area of the photosensitive material mounting table.

In this embodiment, as described above, the opening 144 is shielded while the light shielding curtain 240 is held by many rods 249. Therefore, since the light-shielding curtain does not hang down and the flatness is substantially maintained, the document placing operation is facilitated. Further, as described above, the flatness is good, so that the light-shielding effect is high and the opening portion Compared with the area, it is not necessary to increase the area of the shading curtain so much that the shading is completely maintained.

Then, the roller chain 246, which is driven by a motor (not shown) and hung on the sprockets 241, 242A, 243, 244, reciprocates to move the photosensitive material mounting table 201.
It is possible to open or close the window (opening) 144 when the document is inserted into the document table 140. Such a shading curtain 24
0 means that the light-shielding curtain travels on a surface slightly lower than the original table lower surface 142, that is, a boundary area between the first chamber and the second chamber, with respect to the first chamber of the second chamber in which the sensitive material mounting table 201 is housed. It is provided so that formation and release of light tightness can be switched.

A long roll 402 of silver salt color photosensitive material is housed in a cartridge 401, and the original roll of the photosensitive material loading section 400 of the color proof making apparatus 100 with the leading end of the photosensitive material being exposed about 200 mm from the outlet. The lid 404 loaded in the loading chamber 403 and opened by the hinge 405 is closed so that it can be clamped by the clamper 406.

The leading end of the long roll of the photosensitive material is sent out by the sandwiching roller 511, and the leading end is aligned with the cutter 510 and stands by. Further, the holding table 511 is further fixed by the nip roller 511.
The tip portion is sent to the left end of 7 and the tip portion is sucked by the suction cup 523, and the traveling head 522 having the suction cup is guided by the rollers 525 and 526 to the traveling rails 521 on both sides to measure the predetermined length of the photosensitive material. Move to the specified position and stop. The photosensitive material is cut by a cutter 510, and the photosensitive material mounting table 201 is further cut.
Is moved so that the tip of the photosensitive material is located at a predetermined position. After the suction of the suction cup of the traveling head is cut off, the traveling head 522 returns to its original position.

Here, the traveling head 522 has solenoids 535 attached to both sides via brackets 534, and its movable iron core 5
A frame 531 is fixed to 36, a traveling head 522 and a suction plate 523 connected to a hose 524 are attached to the frame 531 and a holding pipe 537 of the suction plate penetrates through guide holes formed in the head and the frame. The frame is fixed in the thrust direction to the frame, and is exposed to the head through a spiral spring 532 that is slidably installed along the hole and is inserted between the traveling head 522 and the frame 531. It is emerging from the table. When the solenoid is energized and the suction valve is further opened, the suction cup descends to adsorb the photosensitive material, and then the solenoid is de-energized to lift the suction cup and convey the photosensitive material.

When the photosensitive material is conveyed and placed on the photosensitive material mounting table 201 in this manner, the blower 204A is driven through the flexible hose 205 to suction the suction hole formed on the photosensitive material mounting table 201. A pressure is applied, and the photosensitive material is closely fixed on the photosensitive material mounting table. This state of being fixed in close contact is held until the exposure is completed a plurality of times and the photosensitive material starts to be conveyed to the developing section.

Further, in this state, since the light-shielding curtain 240 is in the light-shielding position, the second chamber having the photosensitive material mounting table remains in the state where the dark chamber is formed.

Here, the first chamber is lit by outside light by passing through the upper light-shielding cover 120, and the registration pin (pin bar) 143 set on the upper surface 141 is attached to the decomposition mesh original (black plate and YM).
Most of the manuscript is provided with the reference hole of one of C, for example, Y plate, or any one of Y, M, C, and black plates, or a plurality of these), and most of the document is the light-shielding curtain 240 and It is placed on a light-shielding curtain made up of a rod 249 for holding.

In this state, the light-shielding cover 120 is closed to make the first chamber a dark room so as to be light-tight, and the photosensitive material mounting table is raised slightly below the light-shielding curtain, and then the light-shielding curtain is moved to be opened. Then, the first chamber with the upper surface of the document table and the second chamber with the photosensitive material mounting table
The photosensitive material mounting table 201 is raised in a state where the chamber is a common dark room so as to coincide with the exposure surface, that is, the reference surface of the separated half original. At this time, the airtight packing 201c provided on the abutting surface 201b around the sensitive material mounting table in the second chamber comes into close contact with the lower surface 142 of the document table 140 in the first chamber, and the sensitive material mounting table is fitted into the opening 144. The gap formed by the surface 201d forms the suction channel groove 204, and the airtightness between the original and the photosensitive material sandwiched between the original table surface and the photosensitive material mounting table surface and the transparent cover sheet is maintained. That is, the transparent cover sheet 275 has one end fixed to a plate 124 of the cover that is detachably provided near the opening when the light-shielding cover 120 is opened and closed, and the other end is below the hinge 121 in the first chamber. It is fixed to the tension member 277 provided.

The tension member may be a simple spring, but in the present embodiment, a torsion bar is fixedly provided, and a cover sheet is wound around it about once and fixed.

The torsion bar is biased by a torque spring in the direction in which the cover sheet is wound.

By doing so, it is possible to absorb a phenomenon that the linear distance between the fixed positions of both ends of the transparent cover sheet is geometrically different when the light-shielding cover 120 is opened and when it is closed or in the middle of the light-shielding cover 120. It is possible to keep the cover sheet in a state of being close to a plane and in which tension is evenly and properly applied.

When the light-shielding cover 120 is closed with such a transparent cover sheet set, both ends of the cover sheet are positioned slightly lower than the original table surface, so that the original net film and the photosensitive material are necessarily placed on the cover sheet. The transparent cover sheet can be pressed against the surfaces of the original table and the photosensitive material table.

The squeeze roller 276 has a structure in which a flexible material 276B such as a sponge material, a liquid or a gas is packed on the outer side of a shaft 276C, as shown in the configuration diagram of FIG.
The outer peripheral surfaces of them are wrapped with a sheet material 276A. That is, these flexible substances 276B are filled inside the sheet material 276A to form a two-layer structure.

The squeeze roller 27 configured as described above
As shown in FIG. 7, when the photosensitive material 402, the original document, and the cover sheet 275 stacked on the photosensitive material mounting table 201 forming the exposure table are pressed down and squeezed, the photosensitive material mounting table 20
That is, even if the exposure table is slightly distorted, the squeeze roller 276 evenly contacts and presses the surface evenly, so the squeeze smoothes the effect of eliminating air, and the adaptability to some deviation of the flatness is improved. Get better

Therefore, as compared with the case where a conventional solid roller having a high rigidity or a rubber roller having a high hardness is used as the squeeze roller 276, the manner in which the original is superposed on the photosensitive material is more stable, and contact exposure without wrinkles or deviations is possible. become.

Then, in this state, the squeeze roller 276
Can be squeezed and the air between the transparent cover sheet and the document table can be evacuated by a pressure reducing blower or a vacuum pump to secure a high degree of contact flatness.

In this embodiment, the squeeze roller is the exposure unit 30.
When the light-shielding cover 120 provided on 0 is covered, the exposure unit 300
When it reciprocates and does not squeeze in the forward movement and does not expose in the backward movement, mount the squeeze roller 276 and attach the bracket 2
The movable iron core of the solenoid 284 acts on the part of 282B of the swing lever 282A that rotates around the rotation axis of 83 by energization,
Place the roller on the transparent cover sheet 275 to complete the squeeze.

When there is no squeeze, the roller 276 is de-energized so that the solenoid does not work and the spring 286 works so that the squeeze roller is lifted from the document placing surface or the document table surface.

A window is opened in the cover sheet in a region close to the portion where the transparent cover sheet 275 touches the registration pins 143, and a stretchable rubber sheet 278 as shown in FIG. Have been blocked.

When the transparent cover sheet 275 is covered, the surface of the cover sheet is prevented from being deformed or broken by the registration pins, and the suction and decompression effect when suction is applied can be sufficiently achieved. Is done.

Further, it is important to clean the transparent cover sheet 275, and by removing the plate 124 having one end of the transparent cover sheet 275 fixed from the light-shielding cover 120, it is possible to easily wipe off the dirt on the front and back surfaces of the cover.

Furthermore, since the both ends of the gas spring 122 are pivotally fixed to the bracket 126 of the main body and the bracket 127 of the light shielding cover, the light shielding cover 120 can be operated smoothly and lightly.

In any case, when the squeeze is completed, a blower 206 as a pressure reducing device works and is sucked through the flow path groove 204 through a suction hose 207 connected to a suction hole 201f formed in the photosensitive material mounting base 201. The air present between the cover of the photosensitive material mounting table and the upper surface of the document table and the cover sheet is sucked, and the photosensitive material, each document and the cover sheet are superposed and held in a planar manner. However, the suction hole 201f may be a hole formed in the document table.

At this time, as shown in FIG. 4, the abutting surface 201b, the airtight packing 201c and the original table, which are affixed to the abutting surface 201b, are arranged so that the upper surface 141 of the original table 140 and the upper surface 201a of the photosensitive material placing table 201 are flush with each other. The dimensional relationship between the lower surfaces 142 of 140 is adjusted. By doing so, the flow of air between the transparent cover sheet and the document table and the photosensitive material mounting table is smoothly performed through the flow path groove, and the cover sheet, the document, and the photosensitive material have the correct planar shape. The stable adherence of is achieved. Further, the photosensitive material mounting table may be located at a position slightly lower than the document table.

In this state, the exposure unit 300 again travels on the guide rails 317A and 317B to perform scanning exposure, and the first color exposure by the filter is completed. Of course, at this time, the squeeze roller 276 is turned off so that it does not interfere with the exposure.

Next, in order to perform image exposure with a second color filter for the second time, the photosensitive material mounting table is lowered to a position slightly below the path of travel of the light-shielding curtain, and air is blown by a nozzle there.
When the blower 206 is switched to the blowing side and air is blown into the channel groove 204 to further close the light shielding curtain, the original and the photosensitive material are easily and completely separated. The blower may be blown in and the photosensitive material mounting table may be lowered in the reverse order or at the same time. When the light-shielding cover 120 is opened, the first chamber becomes a bright chamber, but the second chamber is light-tight with respect to the first chamber and a dark chamber is formed.

At the same time, the transparent cover sheet 275 whose one end is stopped by the light-shielding cover 120 opens the light-shielding cover and is lifted obliquely upward so that the next original film can be easily loaded.

In this state, the second original (black plate and Y, M, C
One of them, for example, M plate, or any one of Y, M, C, and black plates, or a plurality of them) is set on the registration pin, and after covering the light shield cover, open the light shield curtain. When the material placing table is raised to the original table surface, the transparent cover sheet is automatically re-covered and the exposure unit 300
The squeeze roller attached to the is squeezed to perform squeeze, suction is applied, each sheet is brought into close contact, and the polygonal cylinder 301 is rotated, and the cylinder surfaces provided on another filter are opposed to each other by the second color filter. Scanning contact exposure is performed by moving the exposure unit, and the second exposure is completed. Similarly, the third manuscript (black plate and one of Y, M, C, such as C
A plate, or any one of Y, M, C, and black plates, or a plurality of these) and a filter corresponding thereto are also exposed by the same procedure to complete the third exposure. In this way, the exposure is repeated once to several times as required. Finally, the photosensitive material mounting table is lowered to the lowermost portion to release the contact state of the photosensitive material by releasing the suction, and the leading end of the photosensitive material is fed to the holding roller 552 by the traveling of the suction cup 523.

The photosensitive material, the tip of which has reached the nip roller 552, is sent to the left development processing section 600. When the internal latent image type direct positive light-sensitive material is used, the second exposure unit 350 can perform fog exposure while it is being conveyed through the color developing tank 601. Then, it passes through the bleach-fixing tank and the stabilizing tank, is dried while being conveyed by the drying section 680, and the developed photosensitive material is collected at the left end of the apparatus.

The exposed light-sensitive material is the developing processing unit 600.
After the photosensitive material is started to be conveyed through the photosensitive material mounting table, the following photosensitive material is conveyed to the photosensitive material mounting table 201, measured and cut by the cutter unit 510, and then a process of closely setting is performed. , As described above.

The photosensitive material requires the second exposure when the internal latent image type direct positive photosensitive material is used, but the second exposure is not necessary when the negative color photosensitive material and the solarization type direct positive photosensitive material are used, and the light is turned off. Leave. When other dye bleaching type color light-sensitive materials, color reversal, diffusion transfer and other light-sensitive materials are used, it is possible to carry out exposure and development processing in the same system by providing a processing bath suitable for each of them. ..

Of course, for the exposure to the direct positive photosensitive material, black plates are overlaid on the originals of the Y plate, the M plate and the C plate respectively, and the B plate, the M plate and the black plate for the Y plate and the black plate. The G and C plates and the black plate are exposed three times in correspondence with the R filter. For the exposure to the ordinary negative color light-sensitive material, the Y plate, the M plate, C version manuscripts are piled up separately, B for Y version, G for M version, R for C version
The same filter is overlaid and exposed three times, and then the black plate is overlaid for the fourth time and the ND filter, and if necessary, the color filter for color correction is made to correspond, or triple exposure of B, G, and R is performed. ..
Further, if necessary, in addition to the above-mentioned color separation exposures, light that is equivalent to different color separations may be used for further exposures so as to produce a basic color suitable for the printing ink. In addition, in order to blend lights having different color separations in advance, it is possible to perform processing such as blending BGR color lights or exposing in combination with a filter. Similarly, in order to reproduce a color suitable for a special ink other than the standard inks of Y, M, C, and black, which are generally called special colors, repeated exposure, blending of colored light, or combination of filters may be performed. In this case, depending on the case, it is necessary to use a decomposition mesh film called a special color plate, or to combine other films with a special color decomposition mesh film. It is necessary to carry out close contact baking.

There are high-sensitivity photosensitive materials and non-sensitive photosensitive materials. When a low-sensitivity photosensitive material is used, a plurality of light source lamps 302 of the polygonal cylinder 301 of the exposure section 300 are used and a large number of lights are turned on. You may make it possible to make exposure strong.

Further, the exposure window 310 is a measure for reducing the scanning speed.
It is possible to perform high-quality exposure without deteriorating the reciprocity law failure condition by using the treatment for changing the opening and closing of No. 2 in combination or alone.

[0060]

By the contact exposure apparatus of the present invention, the contact state of the decomposed mesh original with the photosensitive material can be stably realized without generating wrinkles, and the photosensitive material of the photosensitive material mounting table of the contact exposure apparatus. Even if the accuracy of the flatness of the mounting surface, that is, the exposure surface is somewhat poor, good contact exposure can be achieved with a margin. And now you can create good quality color proofs.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of a color proof making apparatus of the present invention.

FIG. 2 is a side view of an embodiment of the color proof making apparatus of the present invention.

FIG. 3 is a top view of the color proof making apparatus shown in FIG.

FIG. 4 is a side sectional view showing a positional relationship between a document table and a photosensitive material mounting table.

FIG. 5 is a sectional view of an exposure unit and a squeeze roller unit.

FIG. 6 is a partially enlarged view of FIG.

FIG. 7 is a diagram showing a relationship of overlapping of a photosensitive material, a document, and a cover sheet on a photosensitive material mounting table.

FIG. 8 is a configuration diagram of a squeeze roller.

[Explanation of symbols]

 100 Contact exposure system main body 120 Light-shielding cover 121 Hinge 124 Plate 140 Platen 143 Pin bar 144 Window 240 Light-shielding curtain 275 Transparent cover sheet 276 Squeeze roller 276A Sheet material 276B Flexible material 276C Shaft 277 Tension member (torsion bar) 284 Solenoid 282A Swing lever 300 exposure unit 400 sensitive material loading unit 401 cartridge 402 long winding roll 403 original winding loading chamber

Claims (1)

[Claims] 1. A photosensitive member processed to a predetermined size by fitting the pin hole of a document film having a positioning pin hole into a pin of a pin bar fixed on a document table and positioning and mounting the document. After the material is positioned and fixed on the photosensitive material mounting table, the respective mounting surfaces of the document table and the photosensitive material mounting table are made substantially the same surface and covered with a cover sheet, and the cover sheet surface is squeezed by a squeeze roller. In the contact exposure apparatus, the step of exposing the cover sheet after depressurizing the inside of the cover sheet is repeated on the same photosensitive material by replacing a plurality of originals prepared by color separation and repeating the exposure a plurality of times. The contact exposure apparatus characterized in that the squeeze roller material is composed of a double structure of a sponge material, a liquid gas soft material and a surface sheet material covering them.