JPH01164944A - Contact exposure device - Google Patents

Abstract

PURPOSE:To form a darkroom with machine in order to set a photosensitive material in a specific position by providing an original platen which has an aperture part and where a light shielding member is provided to be able to open and close the aperture part along a bottom surface and a photosensitive material placing table so that the size of the opening of the light shielding member includes the cross section of a placing table moving area. CONSTITUTION:The original platen 140 is provided, which has the aperture part 144 pierced from a surface 141 to the bottom surface 142 and whose surface 141 can position to place an original and where the light shielding member 240 is provided to be able to open and close the aperture part along the bottom surface. And the photosensitive material placing table 201 is also provided, which can move in the vertical direction of the aperture part 144 and is equipped with a colliding surface with the bottom surface 142 and a fitting surface into the aperture part 144 when the light shielding member 240 moves to fit in the open aperture part 144 and where the photosensitive material can be positioned to be placed on the surface and the size of the opening of the light shielding member 240 includes at least the cross section of the moving area of the placing table 201. Thus, operation for contact, positioning and displacing the original can be very safely executed in a bright spot.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method for placing each printing plate original that has been developed and finished by spectral exposure in a predetermined position and printing each original on a positive color or negative color photosensitive material. This invention relates to an improvement in an exposure device, which is a technology for directly inspecting the presence or absence of abnormalities in a final document for producing a printing plate by overlapping exposure a plurality of times each time to produce a color image copy with the same color scheme as the finished print.

[Conventional technology]

Conventionally, exposure devices have two methods: irradiating light source light onto the document surface and forming an image on the photosensitive material using a projection lens that has the function of enlarging, reducing, or equal magnification, and irradiating the light source light by overlapping the document and the photosensitive material. There was a method of contact exposure.

Furthermore, there are scanning exposure and static exposure methods for irradiating light source light, and the former requires a small light source to create a compact exposure apparatus, while the latter requires a fairly large light source, resulting in a large exposure apparatus.

In the plate inspection process, in order to check the correctness of multiple originals of printing plates for color printed matter using an exposure device, the originals are stacked one by one on a color photosensitive material and sequentially exposed to produce an image with the same color tone as the printed material. We create it and inspect it to see if it works as intended.

The exposure equipment used in such processes uses a projection lens, and although it is quite large, it is possible to work in a bright room.

On the other hand, with the contact exposure method, until now it has not been possible to operate in a bright room for photosensitive materials such as color photosensitive materials, which have a photosensitive region in the entire visible range, and they have been forced to fumble around in a dark room. was. However, the contact exposure method has better reproducibility of halftone dots and color tones.

[Problems to be solved by the invention] ゛As mentioned above, when exposing each printing plate original to the same color photosensitive material multiple times, there are two cases: projection with a lens and contact exposure. has better reproducibility of halftone dots and color tone.

However, in contact exposure, the original and the photosensitive material must of course be properly overlapped on one plane and held on the exposure surface. Moreover, such scanning had to be done in a dark room, which made the work efficiency very poor.

Therefore, the task of setting the original film in a specific position on the document table is done by a person in a darkroom, and the setting of the photosensitive material in a specific position on the photosensitive material mounting table is done by a machine that automatically creates a darkroom.
It is an object of the present invention to provide a contact exposure apparatus with good workability that solves the above-mentioned problems by automatically forming a dark room in both systems during exposure so that the original film and the photosensitive material are held on one plane. This is the object of the invention.

[Means for solving problems]

The object is to provide a document table having an opening formed from the front side to the back side, the front side being provided to enable positioning of a document to be placed, and a light shielding member being provided along the back side so as to be able to open and close the opening; The light-shielding member is movable in a direction perpendicular to the opening, and when the light-shielding member moves and fits into the open opening, it has a surface that abuts against the back surface and a surface that fits into the opening, and the photosensitive material is positioned and placed on the surface. It has a photosensitive material mounting table that makes it possible to
This is achieved by a contact exposure apparatus characterized in that the size of the opening of the light shielding member is provided so as to include at least a cross section of the mounting table moving area.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A printing plate inspection apparatus equipped with a contact exposure apparatus according to an embodiment of the present invention will be described with reference to a front view in FIG. 1, a side view in FIG. 2, and a top view in FIG. However, the present invention is not limited to this example.

The printing plate inspection device checks whether there are any mistakes in the layout of the original film before creating the actual printing plate using each printing plate original film color-separated into 0, M, Y, and black plates.
This device is used to check for color differences, character errors, etc., and it positions the original film one by one and overlays it on a color photosensitive material for multiple contact exposure to produce a color photograph in the same condition as the printed matter. The system was created so that errors in the printed version of the manuscript could be found, and actions could be taken to correct the manuscript in advance.

The main body 100 has a front surface 141 and a back surface 142 on which a registration pin (pin bar) 143 for document positioning is installed on the upper side of the main body 7 frame 101 supported by legs 102.
A light-shielding cover 120 is provided above the document table 140, which can be opened and closed to form a dark room as a first chamber.

Further, an exposure section 300 for scanning and exposing the contact exposure surface of the document table is provided in the first chamber. At the center of the exposure section, one or more (three in the embodiment) tubular light source lamps 302A are installed.
, 302B, and 302C are provided surrounded by a drum-shaped internal reflecting mirror 306 fixed to a housing 316 and a transmission window 304. A polygonal tube 301 is rotatably provided on the outside thereof with filters such as B, G, R, ND arranged on each tube surface concentrically, and the filter surface and the transmission window are arranged on the contact exposure surface. They are meant to face each other. It has a shielding plate 308, a solenoid 312 for operating it, a return spring 314, and an exposure window 310 on the outside thereof.
A housing 316 is provided. The exposure section 300 can run on the rails 317A and 317B for scanning.

A photosensitive material mounting section 200 is provided inside the main body frame 101 as a second chamber. And the sensitive material mounting table 201 is
It is driven by a torque motor 214 and can be moved up and down.

On the other hand, an endless light-shielding belt 242 as a light-shielding member is wrapped around the rollers 241, 242A, 243, 244, and an exposure window having a size at least larger than the cross section of the moving area of the photosensitive material mounting table is opened approximately in the middle of the length. It is being In such a light-shielding member 240, the light-shielding belt runs on a surface slightly lower than the back surface 142 of the document table, that is, the boundary area between the first chamber and the second chamber, so that the second light-shielding member 240 in which the photosensitive material mounting table 201 is housed can be seen. The first chamber is provided so as to be able to switch between forming and releasing light tightness to the first chamber.

Furthermore, it is not absolutely necessary that the light-shielding member be an endless light-shielding curtain belt, but it may take the form of a light-shielding plate that has an exposure window with the above conditions and a sufficient shielding area and slides back and forth for opening and closing. This can also be done successfully as another embodiment of the invention.

Further, a long roll 402 of positive silver salt color photosensitive material is loaded into a magazine 401 to form a photosensitive material loading section 400, and the leading end of the long roll of photosensitive material is fed out by a nipping roller 511, and the leading end is are aligned at the cutter section 510 and are on standby. Then, the clamping roller 511 is used to hold the fixing base 5.
The tip is fed to the left end of the photosensitive material 27 and is sucked by a suction cup 523, and a traveling head 522 having the suction cup guides its rollers 525 and 526 to the traveling rails 521 on both sides, and the predetermined length of the photosensitive material is The photosensitive material moves to a measuring position and stops, is cut by the cutter section 510, and then moves so that the leading edge of the photosensitive material is positioned at a predetermined position on the photosensitive material mounting table 201, and then hits the suction of the suction cup of the traveling head. Then, the traveling head 522 returns to its original position.

Here, solenoids 535 are attached to both sides of the traveling head 522 via brackets 534, and the movable iron core 535
A frame 531 is fixed to 36, and a rad 522 is attached to the
A suction cup 523 coupled to a hose 524 is attached to the frame 531, and a holding pipe 537 of the suction cup is provided to pass through a guide hole drilled in the head and frame, and the thrust direction is fixed to the frame. The head is slidably installed along the hole and floats above the exposure table surface via a helical spring 532 inserted between the traveling head 522 and a frame 531.

When the solenoid is energized and the suction valve is opened, the suction cup descends to attract the photosensitive material, and then the solenoid is returned to its original position, causing the suction cup to lift up and convey the photosensitive material.

When the photosensitive material is transported and placed on the photosensitive material mounting table 201 in this way, the blower 204A is driven through the flexible hose 205 to apply suction pressure to the suction holes made on the photosensitive material mounting table. The photosensitive material is tightly fixed on the photosensitive material mounting table.

This tightly fixed state is maintained until multiple exposures are completed and the photosensitive material begins to be transported to the developing section.

Furthermore, in this state, the light-shielding curtain 242 is in a light-shielding position, so that the second chamber in which the photosensitive material mounting table is located remains in a state where a dark room is formed.

Here, the upper light-shielding cover 120 is peeled off, the first chamber is illuminated with outside light, and the reference hole of the original (black version and one of YMC, e.g., Y version) is inserted into the registration bin (pin bar) 143 set on the surface part 141. A large part of the document is placed on the light-shielding curtain.

In this state, the light-shielding cover 120 is closed to make the first room a dark room and light-tight, and the light-sensitive material mounting table is raised slightly below the surface of the light-shielding curtain belt, and then the light-shielding curtain belt 242 is moved to open it. The circuit is configured so that the light-shielding belt 242 does not move until the light-shielding cover is completely closed. Then, with the first room containing the surface of the original table and the second room containing the photosensitive material mounting table forming a common dark room, the photosensitive material mounting table 201 is raised to match the exposure surface, that is, the reference surface of the original.

Then, the abutment surface 201b around the photosensitive material mounting table in the second chamber
The airtight gasket 20IC installed in the original platen 1 of the first chamber
40, and the gap created by the insertion surface 201d of the photosensitive material mounting table into the opening 144 is the suction channel groove 2.
04, and the airtightness between the document and the photosensitive material sandwiched between the surface of the document table, the surface of the photosensitive material mounting table, and the transparent cover sheet is maintained.

That is, the transparent cover sheet roll 274 is wound around the shaft 273, and its tip passes through the squeeze roller 276, and then the stopper 274 is rolled up.
Head 27 of cover sheet device 270 stopped at 72
The cover sheet 275 is unwound from the cover sheet roll 274 as the cover sheet 275 is guided by the rails 281A and 281B and moved to the right in FIG.
6, the original and the photosensitive material are covered with a cover sheet, and when the head reaches the right end of the original platen and is sunk below the surface of the original platen so as not to obstruct the movement of the exposure section, the floor 206 is activated. Suction hose 20
7, the air interposed between the exposure table, the upper surface, and the cover sheet is sucked through the flow path groove 204, and the photosensitive material, each document, and the cover sheet are stacked and held in close contact with each other in a planar shape. . At this time, as shown in FIG.
The front abutment surface 201
The dimensional relationship between the document plate 140, the airtight gasket 201c attached thereto, and the back surface 142 of the document table 140 is adjusted. By doing this, air flows smoothly between the transparent cover sheet, the document table and the photosensitive material mounting table through the flow channel grooves, causing deformation to the cover sheet, the document and the photosensitive material. Correct planar adhesion is achieved without any problems. Note that the squeeze roller 276 is not provided in the cover sheet device, but is provided at the lower part of the exposure section 300, and the same effect is obtained.

In this state, the exposure section 300 is connected to the guide rail 317A.
, 317B to perform scanning exposure, and complete the first color exposure using the filter.

Next, in order to perform a second image exposure using a different color original and a different color filter, the cover sheet is returned to its original position, and the photosensitive material mounting table is lowered to a position slightly below the travel path of the light-shielding curtain.
15 or by switching the air outlet side of the floor 206 to blow air into the passage groove 204 and then closing the light shielding curtain, the original and the photosensitive material can be easily and completely separated. When the light-shielding cover 120 is opened, even though the first room becomes a bright room, the second room is light-dense compared to the first room, forming a dark room.

In this state, set the second original (black version and one of YSM, C, e.g. M version) on the registration pin, cover it with a light-shielding cover, and then open the light-shielding curtain and raise the surface of the photosensitive material mounting table to the surface of the document table. Then cover the cover sheet again and apply suction to make each sheet adhere tightly and turn the polygonal cylinder 301.
The cylindrical surfaces provided on another filter are made to face each other, and scanning contact exposure is performed using a second color filter to complete the second exposure.

Similarly, the third original (black version and one of Y and MlC, for example, 0 version) is exposed using the corresponding filter in the same procedure to complete the third exposure.

Finally, the photosensitive material mounting table is lowered to the lowest position, the suction is released to release the photosensitive material, and the tip of the photosensitive material is fed to the nipping roller 552 by a device (not shown).

The photosensitive material whose tip has reached the nipping roller 552 is guided by the guides 561, 562, 563, 56 of the conveyance chute section 550.
4.565 and switching chute 566 and guide roller 5
52.553° 554.555.556, and then the swinging shaft 5 of the switching chute 566
By switching around 68, guides 564 and 565 are made with the rear end leading.

Guide rollers 556, 557, 55 on 567.568
8.559 and sent to the developing processing section 600. While being transported through the color developing tank 601, the exposure lamp 351 and filter device 352 of the second exposure section 350
, reflective plates 353 and 354, and an exposure box 356 consisting of an exposure window 355 for fogging exposure. The photosensitive material then passes through a bleach-fixing tank and a stabilizing tank, is dried while being slowly transported through a drying section 680 by transport rollers 681 and 682, and is collected at the right end of the apparatus after being developed.

It should be noted that as the exposed photosensitive material begins to be conveyed through the conveyance chute section 550, the subsequent photosensitive material is transferred to the photosensitive material mounting table 2.
The process of being conveyed onto the old surface, measured, cut by the cutter section 510, and set in close contact is repeated as described above.

When using an internal latent image type direct positive, the photosensitive material is the second
Although exposure is necessary, when using a negative color photosensitive material, the second exposure is not necessary and the light remains off.

Of course, regarding exposure to direct positive photosensitive materials, each Y, M, and C version of the original is overlaid with a black version, and B is used for the Y version and the black version, and 6 is used for the M version and the black version. The %0 plate and the black plate are exposed to light three times using corresponding R filters, but when exposing negative color photosensitive materials, each Y, M, and C plate original is placed on the photosensitive material. Layer it alone, layer G on the Y version for the 81M version, layer R on the C version, and use 3.
The image was exposed twice, and then a black plate was layered and exposed using an ND filter for the fourth time.

Note that the photosensitive material in the exposed area once enters the guide chute 565 and is then turned over and enters the developing device with the emulsion side facing up; however, it can also be directly turned into the developing device without entering the guide chute 565. However, the light source position for the second exposure must be located above the developing device and below the photosensitive material transport path, which makes maintenance and installation somewhat difficult.
This is not very preferable because it requires an exposure window to be opened on the side of the developer tank, making it difficult to clean up leakage.

There are two types of photosensitive materials: those with high sensitivity and those without. When using a photosensitive material with low sensitivity, the exposure area 30
A plurality of light source lamps 302 are provided in the polygonal cylinder 301, and a large number of light source lamps 302 are turned on so that the exposure can be made more powerful.

In addition, by using the measures of lowering the scanning speed and the measures of making the opening/closing of the exposure window 310 variable, in combination or alone, it is possible to perform high-quality exposure without worsening the reciprocity law failure condition.

〔Effect of the invention〕

According to the present invention, the exposure device is made compact, and operations such as contacting, positioning, and converting documents during multiple exposure of the original film of each printing plate to the photosensitive material can be carried out extremely safely, quickly and reliably in a bright place using an extremely simple mechanism. As a result, the adhesion effect by the suction is smooth, and images equivalent to printed matter are formed without damaging the device, the original, or the photosensitive material, making it possible to accurately inspect the original.

[Brief explanation of the drawing]

FIG. 1 is a front view of a printing plate inspection device equipped with an exposure device 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. 1. FIG. 4 is a side sectional view showing the positional relationship between the document table and the photosensitive material mounting table. 100... Printing plate inspection device main body 120... Light-shielding cover 140... Original table 1
41...Front surface 142...Back surface 144
...Opening part 200...Sensitive material placement part 201...Sensitive material placement table 201a...Surface 201b...Abutting surface 201c...Airtight packing 201d.
... Fitting surface 204 ... Suction channel groove 214 ... Torque motor 215 ... Nozzle 240 ... Light shielding member 242 ... Shade curtain belt 270 ... Cover sheet device 275 ... Cover sheet 300 ...Exposure section 350
...Second exposure section 400...Sensitive material loading section 51
0... Cutter section 550... Sensitive material transport chute section 600... Development processing section 680... Drying section

Claims (3)

[Claims] (1) A document table having an opening formed from the front surface to the back surface, the front surface being provided to enable positioning of a document to be placed, and a light shielding member provided along the back surface so as to be able to open and close an opening; The light-shielding member is movable in a direction perpendicular to the opening, and when the light-shielding member moves and fits into the open opening, it has a surface that abuts against the back surface and a surface that fits into the opening, and the photosensitive material is positioned and placed on the surface. 1. A contact exposure apparatus, comprising a photosensitive material mounting table, the opening of the light-shielding member having a size that includes at least a cross section of a movement area of the mounting table. (2) The contact exposure apparatus according to claim 1, wherein the light shielding member is a light shielding plate that is provided with the opening and is movable back and forth. (3) The contact exposure apparatus according to claim 1, wherein the light shielding member is an endless light shielding belt provided with the opening.