JPH04165346A - Attracting and retaining method for negative film - Google Patents

Abstract

PURPOSE:To enable force-fitting to a glass plate speedily and surely even in the case of a large-sized negative film by arranging a force-fitting member made of a rubber film and the like on the side of an attraction plate or force- fitting plate, and discharging air remaining between a negative film face and a retaining plate face. CONSTITUTION:A force-fit plate having a packing member 17 and a force-fit plate 19 having a rubber film 21 and a sponge sheet 20 are arranged openably and closably on a force-fit film retaining plate 14, so as to force-fit it, where a negative original plate 22 and a photosensitive material 23 are capable of being set on a film guide 16 having an air discharge hole 15 and an opening part being the same as the size of the photosensitive material. After photosensitive materials such as a negative film and a raw film are set together, the plates 18, 19 are set and force-fitted and air is discharged from the air discharge hole, whereby a rubber film 21 is attracted so that air remaining between the negative film and the raw film and the raw film and the retaining plate 14 is discharged forcedly. It is possible to carry out sure and speedy fitting in this way.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to negative film (hereinafter referred to as negative) in printing for photography, plate making, holography, scanners, duplexes, etc.
The present invention relates to a method for suctioning and holding a negative onto a glass plate with good flatness, and a method for holding a negative in close contact with a photosensitive material by suction in contact printing.

[Conventional technology] Conventionally, in order to hold films such as negative master plates (hereinafter referred to as negatives),
There is a method of holding the negative by suction on the glass plate by discharging air between the negative surface and the glass plate surface from the side edge of the negative on a holding plate such as a glass plate. (For example, patent application 1977)
(No. 114,983) Another method for closely printing a negative onto a photosensitive material is to similarly apply suction from the side edges of the negative and the photosensitive material to bring them into close contact with each other on a holding plate.

[Problems to be Solved by the Invention] Conventionally, in both cases of adhering a film to a glass plate and adhering a negative to a light-sensitive material by adsorption, the larger the negative, the more it is necessary to use a glass plate or holder for adsorption. It is necessary to press the plates strongly, and the more you press the film, the more the periphery of the film is pressed, making it more difficult to remove the air remaining between the negative and the glass plate. The disadvantage was that it was difficult to ensure that

That is, in the conventional method, even if suction is performed, the air remaining in the image area cannot be discharged, so the entire surface of the negative is not suctioned, and the problem is unavoidable that the image floats up and becomes out of focus.

Furthermore, even when flat suction is possible, conventional methods not only require a pressure plate to hold down the glass plate, but also have the drawback of requiring a long time to suction the entire negative, making it difficult to operate quickly and inefficient. there were.

The present invention makes it possible to easily, quickly and reliably evacuate the residual air even if air remains between the negative and the glass plate when the negative is pressed by the adsorption plate, without having to strongly press and hold the glass plate. The purpose of this project is to develop a method that can hold negatives on a flat surface.

Furthermore, conventional methods for bringing negatives and photosensitive materials into close contact have had disadvantages in that a considerable amount of pressure is required for crimping, and poor adhesion is unavoidable for the same reason. In addition, in order to adsorb the photosensitive material, it was necessary to provide a small suction hole under the photosensitive material, but with the present invention, there is no need to provide such a small hole, and the trouble of applying a roller to exhaust residual air is eliminated. The purpose of this study is to develop an adsorption method that is more efficient and has better adhesion by using an air evacuation device with a weaker suction force.

[Means for Solving the Problems] In order to achieve the above object, in the present invention, air is sucked from the side edges of the negative, etc. on a holding plate such as a glass plate, and the suction plate side The film is adsorbed and held on the holding plate surface by placing a pressure bonding sheet such as a rubber film on the film and simultaneously suctioning it to forcefully discharge the air remaining between the negative surface and the holding plate surface. This problem has been resolved.

[Function] That is, the function of the present invention will be explained using the negative adsorption device shown in FIG. When the air is discharged from the air exhaust hole (4), the negative will be attracted to the glass plate, but as stated above, only the peripheral area is crimped and the central area away from the periphery is not sucked. There is a drawback that a residual air portion as shown in (6) remains.

Therefore, in the present invention, as shown in FIG. 2 (7), a pressure bonding material such as a rubber film is suctioned.

Then, air is sucked between the negative surface and the glass plate surface, and air is also sucked from the gap between the opening of the suction plate and the negative, as shown in Figure 3, so that the negative is compressed by the rubber membrane. The air remaining between the glass plate and the glass plate is completely exhausted.

When a simple rubber film, vinyl sheet, etc. is used as the pressure bonding material in (7), the purpose is achieved by peeling off the film after completion of suction. In order to make it easier to remove, the rubber film can be easily removed by placing a breathable cloth or the like on top of the rubber film.

Further, as will be shown in Examples later, by providing a sponge sheet or the like with a thickness close to that of the suction plate under the membrane, it is possible to more easily set the film and to perform suction more quickly.

Even under conditions where conventional methods cannot achieve complete contact because residual air is not discharged even after long periods of suction, this method allows residual air to be forcibly discharged, making it possible to reliably achieve close contact. Adsorption time can be significantly shortened, allowing for more efficient operation.

[Example] Next, embodiments will be described with reference to the drawings.

FIG. 4 shows a crimping base plate in which the present invention is implemented.

A rubber membrane (10 ) is placed, its periphery is glued, and Xz is sucked in by an air evacuation device (not shown). In other words, when a negative is set on the suction plate and suction is performed, air is sucked from the side edges of the negative and the negative (6
) and the opening (3) of the suction plate, the rubber film is sucked and the rubber film presses the film.
Therefore, the air remaining between the film and the glass plate is discharged, so that the film is forcibly adsorbed and held on the glass plate.

After suctioning, the negative suction device is removed from the plywood and placed in a predetermined position of a plate making camera, scanner device, enlarger, etc., and printing is performed.

A pressure bonding plate 1 (18) having a packing (17) and a rubber film (21) are placed on a film holding plate (14) in which a negative original plate (22) and a photosensitive material (23) can be set in a film guide (16). ) and sponge seam) (20) is configured to be openable and closable and to press the film holding plate.

As mentioned above, after setting the negative and raw film together, press the pressure plate 1 (18) and the pressure plate 2 (18).
9) is lowered and crimped, and the air is exhausted from the air exhaust hole. As in the previous case, the rubber film (21) is sucked and remains between the negative and the film and between the film and the holding plate. Since air is forcibly discharged and fast and reliable adhesion is possible, only the crimp plate (2) is removed and baking is performed.

Conventionally, it was necessary to provide small holes for suction under the photosensitive material surface of the holding plate, and the part with the small holes was sucked, resulting in poor adhesion, but with the present invention, not only is this not necessary, but it is also easier than before. It also allows for ideal adhesion much more quickly and reliably.

In addition, in holography, if the same operation is performed with only the photosensitive material set, the photosensitive material can be suctioned to the holding plate without suction holes on the underside, and ideal film holding can be achieved. That is, if there is a hole in the lower surface, the hole is attracted, creating a depression and causing vibration, which is a problem, but the present invention solves this problem.

Note that the rubber membrane can be replaced with a flexible membrane such as synthetic resin, or sponge rubber that allows proper ventilation.

In addition, the air exhaust hole (4) in Figures 1 to (3)
) can be made by providing a small hole in the glass on the glass plate side, or by fitting the glass plate into a holding plate punched out to the size of the glass, and suction can be drawn through the gap. Moreover, the air exhaust hole (14) in FIG. 6 can also be provided on the pressure bonding plate 1 (18) side.

[Effects of the Invention] Since the present invention is constructed as described above, it has the following effects.

In other words, in the past, even when a negative was adsorbed by a negative suction device, air remained between the negative and the glass plate, and it was extremely difficult to expel this air, which caused the image to be out of focus. In the present invention, residual air is forcibly discharged by placing it on the pressure plate and suctioning it, so even large negatives with poor flatness can be easily and quickly and reliably pressure-bonded to the glass plate to create an ideal flat surface. Holding and holding in close contact are possible.

In addition, when setting negatives, there is no step in the opening, so the negatives do not fall into the opening, making positioning of negatives much easier, faster, and more reliable than before, making work more efficient. becomes possible.

In addition, in conventional adhesion devices, residual air was unavoidable, resulting in poor adhesion, but with the present invention,
Since residual air is reliably exhausted, sharp close-contact printing without out-of-focus is possible.

In addition, in the past, it was essential to strongly press the glass plate or holding plate for adsorption, and a press device such as a strong spring was indispensable for the printing device, but in the present invention, the rubber film After the remaining air is forcibly discharged and the glass is in close contact, suction can be continued, and there is no need to press the glass. Therefore, it is possible to bring about the great effect that the purpose can be achieved with an air evacuation device having a weaker suction force without providing a crimping part in the printing device or the like.

[Brief explanation of drawings]

1, 2, and 3 are vertical cross-sectional views of the negative suction device, in which (1) is the glass plate, (2) is the suction plate, and (3) is the glass plate.
) is the opening, (4) is the air exhaust hole, (5) is the negative, (6
) is the negative floating due to residual air (10) is the rubber film, (11
) is a sponge sheet, (12) is a ventilation hole 1, (13) is a hole for the adhesive part, (16) is a film guide, (17)
) is a packing, (18) is a pressure bonding plate 1, (19) is a pressure bonding plate 2, (20) is a sponge sheet, (21) is a rubber membrane, (
22) is for negatives, and (23) is for photosensitive materials. Applicant for the above patent: Waki Ligio Figure 4

Claims (1)

[Claims] A negative film alone or a negative film and a photosensitive material are pressed against a holding plate such as a glass plate using a suction plate or a pressure bonding plate having an opening, and air is released from the side edges of the negative film or the negative film and the photosensitive material. When discharging the negative film, a pressure bonding material such as a rubber film is placed on the suction plate or pressure bonding plate side, and the air remaining between the negative film surface and the holding plate surface can be discharged by suctioning this material. 1. A method for suctioning and holding a negative film, characterized in that a film alone or a negative film and a photosensitive material are suctioned and held on the surface of a holding plate such as a glass plate.