JPH077210B2 - Contact scanning exposure system that can be operated in a bright room - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides a direct-positive or negative color light-sensitive material by accurately placing an original of each printing plate developed by spectral exposure at a predetermined position. The present invention relates to an improvement of an exposure device, among the techniques for inspecting whether there is an abnormality in a final original of a printing plate by making a color image copy having the same color arrangement as a printing finish by repeating and firing each separated color plural times.

[Conventional technology]

Conventionally, a scanning exposure type exposure apparatus has adopted a method of irradiating an original with light from a light source through an elongated slit window and forming an image on the photosensitive material with a projection lens having a function of enlarging or reducing the light source. The light source was provided alone. The light source in this case is smaller in volume and compact than the light source in the case of static exposure. On the other hand, in the contact exposure in which the original and the photosensitive material are overlapped and the light source light is irradiated, scanning exposure has not been conventionally performed. By the way, in the plate inspection process, in order to perform correctness inspection of a plurality of originals of a printing plate of a color printed matter by an exposure device, the originals are superposed one by one on a color photosensitive material and sequentially exposed to form an image having the same color tone as the printed matter. , I'm inspecting if it's working as intended.

Since the light-sensitive material handled in such a process is fogged by external light, the above-mentioned work is performed by groping in a dark room.

[Problems to be solved by the invention]

As described above, when an original such as a printing plate is overlaid on a color light-sensitive material a plurality of times and exposed more closely, it is better in reproducibility of halftone dots and color tones than when projected by a lens. However, in the case of contact exposure, when static exposure is performed as in the conventional case, a large light source is required, the size of the apparatus becomes large and the power also becomes large. Further, since the light-sensitive material to be handled is fogged by external light, the above-mentioned operation has to be performed by groping in a completely dark room, and workability is very poor. It is an object of the present invention to solve the above problems and to provide a contact scanning exposure apparatus which uses a small light source and can be operated in a bright room.

[Means for solving problems]

This purpose has a positioning member for positioning the document,
In a scanning exposure apparatus in which a document and a photosensitive material are brought into close contact with each other to expose the photosensitive material from the side of the document, a main body frame having an opening and an opening of the main body frame are opened and closed to make the main body frame light-tight. A light blocking member, a photosensitive material mounting table arranged in the main body frame for mounting the photosensitive material, a photosensitive material mounting table driving means for moving the photosensitive material mounting table in the vertical direction, and the original in a light-tight manner. A light-blocking opening / closing cover for closing the light-blocking opening / closing cover and opening the opening of the body frame by the light-blocking opening / closing cover, the document passes through the opening and the photosensitive material on the photosensitive material mounting table is exposed. This is achieved by a scanning exposure apparatus characterized in that it is brought into close contact with the material.

〔Example〕

A printing plate inspection apparatus equipped with an exposure apparatus according to an embodiment of the present invention will be described with reference to the front view of FIG. 1, the side view of FIG. 2 and the top view of FIG. However, the present invention is not limited to this embodiment.

The printing plate inspection device uses the original films for each printing plate that have been color-separated into the C plate, M plate, Y plate, and Sumi plate to make sure there is no mistake in the layout of the original film before making the actual printing plate This is a device for inspecting whether there is any error in the characters, etc., position the original films one by one, overlay them on the color photosensitive material and perform multiple contact exposure to create a color photograph in the same state as the printed matter. , It is designed to detect an error in the manuscript for the printing plate so that an action to correct the manuscript can be taken in advance.

The main body 100 is a main body frame 101 supported by legs 102.
Register pin (pin bar) 14 for document positioning on top of
There is an upper surface portion 140 having a surface 141 on which the 3 is installed, and a light shielding cover 120 capable of forming a dark room as a first chamber is openably and closably provided on the upper surface portion.

An exposure unit 300 for scanning and exposing the contact exposure surface of the upper surface is provided in the first chamber. At the center of the exposure unit, one or a plurality of (three in the embodiment) tubular light source lamps 302A, 302 are provided.
D-shaped inner reflecting mirror 30 in which B and 302C are fixed to a housing 316
It is provided surrounded by 6 and the transparent window 304. A polygonal cylinder 301 is concentrically provided on the outer side of the central part so as to be rotatable by disposing filters such as B, G, R, and ND on each cylinder surface, and a film surface and the transmission window are provided on the contact exposure surface. To face. Then, a shielding plate 308 is provided outside thereof.
And a housing 316 having a solenoid 312 for operating it, a return spring 314 and an exposure window 310. The exposure unit 300 is allowed to travel on the rails 317A and 317B for scanning.

An exposure table part 200 is provided as a second chamber inside the main body frame 101. The exposure table 201 is driven by a motor 214 so that it can move up and down.

On the other hand, the endless blackout curtain belt 242 is the roller 241,242A, 24.
Half of the length is hung on 3,244, and half of the length is completely shaded, and an exposure window having a size at least larger than the cross section of the exposure table moving area is opened in the center of the half length of the curtain. There is.
In such a light-shielding curtain portion 240, the light-shielding curtain travels on a surface slightly lower than the document positioning surface, that is, a boundary area between the first chamber and the second chamber, whereby the second chamber in which the exposure table portion 200 is housed. It is provided so that formation and release of light tightness with respect to the first chamber can be switched.

Further, a long roll 402 of a positive type silver salt color photosensitive material is loaded into a magazine 401 to form a tube material loading section 400, the leading end of the long roll of photosensitive material is fed out by a nip roller 511, and the leading end is It is aligned with the cutter 510 and waits.
Then, the nipping roller 511 further feeds the tip to the left end of the fixed base 527, and the tip is adsorbed by the suction cup 523, and the traveling head 522 having the suction cup guides the rollers 525 and 526 to the traveling rails 521 on both sides to be exposed. A predetermined length of material is moved to a position where it is measured and stopped, and is cut by a cutter 510, and further moved so that the tip of the photosensitive material is located at a predetermined position of the exposure table 201, and the suction cup of the traveling head is moved. After cutting the suction, the running head 522 returns to its original position.

Here, a solenoid 535 is attached to both sides of the traveling head 522, a frame 531 is fixedly mounted on a movable iron core of the traveling head 522, and a suction plate 523 connected to a hose 524 is attached to the traveling head 522 and the frame 531. The holding pipe 537 is provided so as to penetrate through the holes formed in the head and the frame,
A spiral spring 532 fixed to the frame in the thrust direction, slidably installed in the head along the hole, and inserted between the traveling head 522 and the frame 531.
Through the exposure table surface. When the solenoid is energized, the suction cup descends through the frame to adsorb the photosensitive material, and then the solenoid is returned to lift the suction cup to convey the photosensitive material.

When the photosensitive material is conveyed and placed on the exposure table 201 in this way, the suction pressure is applied to the suction hole formed on the exposure table by driving the blower 204 via the flexible hose 205, and the photosensitive material is It is closely fixed on the exposure table.

In this state, since the light-shielding curtain 242 is in the light-shielding position, the second chamber having the exposure table remains in the state where the dark chamber is formed.

Here, the original (one of the Sumi plate and the YMC, for example, the Y plate) is set on the resist pin (pin bar) 143 set on the upper surface part 141 by making the first chamber bright by outside light by passing through the upper light shielding cover 120.
Then, most of the original is placed on the light-shielding curtain after being placed in the reference hole.

In this state, the light shielding cover 120 is closed to make the first chamber a dark room to be light tight, and the light shielding curtain belt 242 is moved to be opened. Then, with the first chamber having the upper surface portion and the second chamber having the exposure table portion being the common dark room, the exposure table 201 is raised to coincide with the exposure surface, that is, the original reference surface. At this time, the airtight cushion provided around the exposure table in the second chamber is the upper surface portion 140 of the first chamber.
A document which is in close contact with the lower edge portion of the exposure table fitting window opened in the above, the gap of the fitting section forms the suction channel groove 204, and which is sandwiched between the upper surface section and the exposure table surface and the transparent cover sheet. And airtightness between the photosensitive materials is maintained.

Then, the transparent cover sheet roll 274 is wound around the shaft 273, the leading end of the transparent cover sheet roll 274 is passed through the squeeze roller 276, and the head 271 of the cover sheet device 270 stopped by the stopper 272 is connected to the rails 281A, 2
Cover sheet 275 unwound from cover sheet roll 274 by moving to the right in FIG. 2 guided by 81B
Is pressed by a spring 278 and squeezed by a squeeze roller 276 that is rotatably fixed by a shaft 277, the original and the photosensitive material are covered with a cover sheet, and the head reaches the right end so that the exposure unit is not blocked. The blower 206 works when it is submerged below the surface of the platen, so that the suction hose 2
Air that has been sucked through the flow path groove 204 via the 07 and is interposed between the exposure table and the upper surface portion and the cover sheet is sucked, and the photosensitive material, the respective originals, and the cover sheet are stacked and held in close contact with each other in a planar manner. . It should be noted that the squeeze roller 276 is not provided in the cover sheet device, but a means for providing the squeeze roller 276 in the lower portion of the exposure unit 300 is also implemented to obtain the same effect.

In this state, the exposure unit 300 travels on the guide rails 317A and 317B to perform scanning exposure, and the first color exposure by the filter is completed.

Next, in order to perform image exposure with a second original of another color and a filter of another color, the cover sheet is returned to its original position and the exposure table is lowered to a position slightly below the path of the light-shielding curtain. The original and the photosensitive material can be easily completely separated and removed by blowing and closing the light-shielding curtain. The first chamber remains a bright chamber, but the second chamber is light-tight with respect to the first chamber and forms a dark chamber.

In this state, set the second document (Sumi plate and one of Y, M, and C, for example, M plate) on the resist pin, cover the light-blocking cover, raise the exposure table to the upper surface, cover the cover sheet again, and remove suction. Polygonal cylinder
By rotating 301, the cylindrical surfaces provided on another filter are opposed to each other, and scanning contact exposure is performed by the second color filter, and the second exposure is completed.

Similarly, exposure by the third original (Sumi plate and one of Y, M, and C, for example, C plate) and the filter corresponding thereto is also performed in the same procedure, and the third exposure is completed.

Finally, the exposure table is lowered to the bottom to release the contact state of the photosensitive material by releasing the suction and releasing the nip roller 55.
The tip of the light-sensitive material is fed to 2 by an apparatus (not shown).

The photosensitive material, the tip of which reaches the nip roller 552, is fed downward by the guides 561, 562, 563, 564, 565 of the transport chute unit 550 and the switching chute 566 and the guide rollers 552, 553, 554, 555, 556, and then the swinging support shaft 5 of the switching chute 566.
By switching around 68, the rear end so far is guided to the beginning
It is conveyed by guide rollers 556, 557, 558, 559 on 564, 565, 567, 568 and sent to the developing processing section 600. Then, while being transported in the color developing tank 601, the exposure lamp of the second exposure unit 350
Fogging exposure is performed by an exposure box 356 including a filter device 351 and a filter device 352, reflecting plates 353 and 354, and an exposure window 355. Then, after passing through the bleach-fixing tank and the stabilizing tank, the drying section 680 is slowly conveyed by the conveying rollers 681 and 682 to be dried, and the phenomenon-processed photosensitive material is collected at the right end of the apparatus.

Incidentally, after the exposed photosensitive material is started to be transported in the transport chute section 550 and the subsequent photosensitive material is transported on the exposure table 201 and measured and cut by the cutter 510,
The step of closely setting is repeated as described above.

When the internal latent image type direct positive is used for the photosensitive material, the second
Although exposure is required, the second exposure is not required when using a negative color photosensitive material, and is left off.

As a matter of course, regarding the exposure to the direct positive photosensitive material, the sum plates are overlaid on the respective originals of the Y plate, the M plate, and the C plate, and the B plate for the Y plate and the S plate, and the G plate for the M plate and the S plate. , The C plate and the Sumi plate are exposed three times in correspondence with the R filter. Regarding the exposure to the negative color photosensitive material, the respective originals of the Y plate, the M plate and the C plate are exposed to the photosensitive material. Overlapping by itself, B filter is overlaid on Y plate, G filter is overlaid on M plate, R is overlaid on C plate, and is exposed three times, and then Sumi plate is overlaid and exposed by corresponding ND filter for the fourth time. .

The exposed light-sensitive material once enters the guide chute 565, flips over, and enters the developing device with the emulsion surface facing up. However, without entering the guide chute 565, you can turn it as it is and put it in the developing device. The light source position for the second exposure must be provided from above the developing device to below the photosensitive material transport path, which makes maintenance and installation somewhat difficult, and an exposure window must be opened on the side of the developing tank. It is not preferable because it causes difficulties in cleaning leaks.

By the way, for example, negative color is used as the photosensitive material,
When a fluorescent lamp is used as the light source, the photosensitivity to R light may be very low. Therefore, in this case, a plurality of light source lamps 302 of the polygonal cylinder 301 of the exposure unit 300 are provided so that a large number of light source lamps 302 can be turned on to enhance the R exposure.

Further, by using the treatment for lowering the scanning speed and the treatment for changing the opening / closing of the exposure window 310 together or alone, it is possible to perform high-quality exposure without deteriorating the reciprocity law failure condition.

〔The invention's effect〕

According to the present invention, the exposure apparatus becomes compact, and the adhesion of the original film of each printing plate to the photosensitive material in multiple exposure,
Positioning and document conversion operations can now be performed quickly and reliably in bright places, and accurate document inspection can be performed accurately without damaging the document or photosensitive material.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a printing plate inspection apparatus equipped with an exposure apparatus of the present invention. FIG. 2 is a front view of the exposure apparatus of the present invention. FIG. 3 is a top view of the printing plate inspection apparatus shown in FIG. 100 …… Printing plate inspection device main body 120 …… Shading cover 140 …… Main body top part 200 …… Exposure base part 215 …… Nozzle 240 …… Shading curtain part 270 …… Cover sheet device 300 …… Exposure part 350 …… 2 Exposure section 400 …… Sensitive material loading section 510 …… Sensitive material cutting section 520 …… Sensitive material transport section 550 …… Sensitive material transport chute section 600 …… Development processing section 680 …… Drying section

Claims (1)

[Claims] 1. A positioning member for positioning a document,
In a scanning exposure apparatus in which a document and a photosensitive material are brought into close contact with each other to expose the photosensitive material from the document side, a main body frame having an opening and an opening and closing of the main body frame are opened and closed to make the main body frame light-tight. A light blocking member, a photosensitive material mounting table arranged in the main body frame for mounting the photosensitive material, a photosensitive material mounting table driving means for moving the photosensitive material mounting table in the vertical direction, and the original in a light-tight manner. And a light-blocking opening / closing cover for closing the light-blocking opening / closing cover, and opening the opening of the body frame by the light-blocking opening / closing cover, the document passes through the opening and the photosensitive material on the photosensitive material mounting table is exposed. A scanning exposure apparatus characterized in that it is in close contact with a material.