JPH0234013B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an original plate holding tool (hereinafter referred to as a negative carrier) for holding a flat negative original plate (including a transparent positive plate) for use in photographic enlargement, plate making, etc.

(B) Conventional Technology Until now, in this field, there was no way to securely maintain the flat surface other than sanding with glass.

When using glass for sand germination, using anti-Newton glass for the lower plate causes out-of-focus, so regular glass is used. Newton rings are unavoidable, and the large number of surfaces causes problems with a large amount of dust. Cleaning the glass also requires a lot of effort. There is a problem that the image is out of focus.

The conventional technology for obtaining flatness by adhering a film to glass using vacuum suction was developed in 1973.
All of them, including the 12388, suck directly onto the negative film surface, so with regular negatives that have images near the edges of the film, the image will be vignetted, making it impossible to print the entire screen. The negatives were damaged and thus could not be applied to the purpose of the present invention.

(c) Problems to be solved by the invention Therefore, at present, Newton's rings are unavoidable when trying to maintain flatness, and in order to avoid Newton's rings, deep narrowing is required to obtain deep depth. . Deep aperture requires long exposure times, and heat deforms the negative, resulting in out-of-focus and particle flow, making it extremely difficult to obtain excellent image quality.

(d) Means for Solving the Problems Therefore, the present invention eliminates the above-mentioned drawbacks without attracting the surface of the negative plate as in the prior art, that is, it holds the negative with good flatness, and at the same time reduces the Newton ring. The purpose of this study is to develop a negative carrier that does not produce negative signals, and attempts to achieve this purpose by the method described below.

This will be explained using the principle explanatory diagram of FIG. 1 as follows.

That is, the present invention has a structure in which a negative original plate 9 is held by a glass plate 3 and a base plate 1 obtained by punching out a portion corresponding to the image area of the negative original plate, and the suction is applied along the side edge of the suction base plate 1. By providing the hole 5 and discharging air in the direction of the arrow by a suction device (not shown), the above-mentioned problems are attempted to be solved at once.

(E) Action That is, when a negative original is inserted and pressed with a glass plate, and suction is applied from the suction hole 5 using a suction device (not shown), the base plate 1 and the glass plate 3 shown in FIG. 1B are separated.
Air will be sucked in from gaps 14 and 15 on both sides of the negative original between the two, but at the same time air will be sucked in from the contact surfaces 16 and 17 (the first
It will also be sucked in from the shaded area in Figure A).

What is important here is that although the negative original plate is crimped with a glass plate, its contact surface 16,
17 is the fact that ventilation is possible without being completely blocked. The reason for this is that the width from the side edge of the film to the image area is only 2-5 mm or less for standard negatives, and only a small portion of the film is crimped, so air can easily be sucked in from the edges 16 and 17. As a result, the air remaining between the negative original plate 9 and the glass plate 3 is also discharged from the suction hole, so that the negative original plate 9 is vacuum-adsorbed to the glass plate with good flatness.

Note that air leakage from both sides of the negative original plate can be prevented by placing sheets 14 and 15 of the same thickness as the film of the negative original plate on the base plate. If a rubber plate is used on the base plate to prevent air leakage, efficient suction can be achieved with a weaker suction force.

(F) Embodiment FIG. 2 shows an embodiment of the present invention which is made so as to be able to suction and hold a flat surface even by weak suction.

This embodiment consists of a suction base plate 1, a rubber plate 2, and a transparent glass plate 3. The adsorption base plate 1 has an image area 4
Of the two thin plates punched out, the upper plate 1a has an intake hole 5a along the outside of the side edge of the film where the negative original plate 9 is located, and an air exhaust hole 7 at the other end. There is no joint, and the air exhaust hole 7 is sealed with the lower plate 1c so that the exhaust joint forms a ventilation path 6 between the hole 7 and the suction hole 5a.
The air exhaust fitting 8 is brought into place. Rubber plate 2 is 1
Similarly to a, an image part 4b and a suction hole 5b are punched out, and these can be replaced with pins 12 so that they match the image part and suction hole on the base plate 1, and the anti-Newton treated transparent glass plate 3 is supported. The structure is such that the portion 11 can be opened and closed freely.

When in use, hold the negative original plate 9 on the rubber plate 2 of the suction base plate.
When the glass plate 3 is inserted into a predetermined position and the glass plate is pressed, the negative original plate is pressed against the rubber plate part as shown in FIG. is compressed by the thickness of the negative, and as a result, the area around the negative original plate is sealed by the rubber plate. At this time, the negative original plate 9
As shown in the figure, it is in a bent state with air remaining between it and the glass, and naturally the flatness of the negative is not good.

Next, when the pump is activated and air is sucked from the air exhaust fitting, air is sucked through the air passage 6 and suction hole 5, and the area around the negative and the underside of the negative are kept sealed or nearly sealed by the rubber plate. Therefore, the air 13 remaining between the glass surface and the negative surface is exhausted from the part that is not in contact with the rubber plate, that is, between the side edge of the negative and the glass surface 3, and the negative original plate 9 As shown in FIG. 3B, the glass plate 3 is tightly suctioned and fixed under the glass plate 3, and an ideal flat surface can be maintained by weak suction.

Incidentally, if the negative original plate is used exclusively for cut film such as 4×5 inch size, suction holes can be provided on all four sides. In the above example, 135, 12
The object of this invention is to move a negative film having continuous image areas in the left-right direction so that it can be suctioned continuously. However, even negatives cut into one frame can be sufficiently adsorbed.

In addition, in the above example, 12 pins were used to hold the rubber plate.
For example, a 6 x 9 cm suction base plate can be used for 6 x 7 size and 6 x 6 size by simply changing the rubber plate for 6 x 7 size and 6 x 6 size. Negatives of various sizes of film can be held by suction.

(c) Effects of the invention Conventionally, there was no way to maintain the entire surface of a negative with good flatness other than using two glass plates with a sandwich, but with the present invention, it is possible to ensure that every corner of the screen is flat with a single sheet of glass. sex becomes possible. Using Newton ring prevention treated glass has the effect of allowing baking without causing Newton rings.
In the embodiment in which a rubber plate is used on the base plate, the purpose can also be achieved by using a vibrating pump for fish farming, which has a weak suction force, or a rubber bulb.

In addition, the suction base plate of the present invention has a simple structure in which two thin plates are glued together leaving a ventilation path, so it is easy and inexpensive to manufacture. 1mm rubber plate,
By making the glass plate 2 mm thick, the overall thickness of the carrier can be made as thin as just 4.3 mm, making it easily applicable to all types of machines, such as enlargers and plate-making cameras with narrow gaps in the negative insertion section.

In addition, since the present invention allows negatives to be held and fixed with good flatness, there is no need for deep apertures, exposure time is greatly shortened, operability is good, and the image quality of photographic images is greatly improved during printing operations, which are much more efficient than conventional methods. It becomes possible to improve.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating the principle of an adsorption type carrier, with FIG. 1A being a front view and FIG. 1B being a side view. In the figure, 1 is the suction base plate, 3 is the glass plate, 4 is the image area, 5 is the suction hole, 9 is the negative original plate, 13 is the residual air between the negative original plate and the glass surface, and 14 and 15 are the negatives inserted. The hatched areas 16 and 17 that sometimes occur represent the contact surfaces between the negative original plate and the glass plate that can be ventilated when they are crimped together. Figure 2A is a front view of an embodiment of the suction type negative carrier;
Figure B is its side view. In the figure, 1 is a suction base plate, 2 is a rubber plate, 3 is a glass plate, 4 is an image area, 5 is a suction hole,
Reference numeral 6 represents a ventilation path, 7 an air exhaust hole, 8 an air exhaust fitting, 9 a negative original plate, 10 a hinge, and 11 a glass support portion. Figure 3 is a side sectional view, and Figure 3A shows the state before the pump is operated by inserting a negative between the rubber plate and the glass plate and crimping the glass plate, and Figure 3B shows the state before the pump is operated. This shows the state in which the negative original plate is suctioned and fixed to the glass surface after being suctioned. In the figure, 11a is the upper plate of the suction base plate;
1c is the lower plate, 1b is the joint between 1a and 1c, 2 is the rubber plate, 3 is the glass plate, 4 is the image area, 5a is the upper plate,
Reference numeral 5b represents a suction hole in the rubber plate, 6 represents a ventilation path, 9 represents a negative original plate, and 13 represents a residual air portion.

Claims (1)

[Scope of Claims] 1. An upper plate and a lower plate made of two thin plates are punched with an opening corresponding to the size of the image, and an opening is punched in the upper plate on both sides of the negative original plate 9 at the position where the negative original plate 9 is placed. A negative original plate 9 is sandwiched between the base plate 1 and the glass plate, which are joined together by providing a plurality of suction holes 5 and air exhaust holes 7 along the outer edge, and leaving a ventilation passage 6 between the upper and lower plates. By connecting a suction pump through the discharge hole 7 and discharging air, the air remaining between the negative original plate and the glass plate is discharged, and the negative original plate can be adsorbed to the glass plate surface. Adsorption type negative carrier featuring 2. The suction type negative carrier according to item 1, in which a soft rubber plate 2 having the same shape as the base plate is provided on the base plate.