JP2916693B2 - Film adsorption holding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial application field The present invention relates to a negative and transparent positive in photo enlargers, duplicators, plate making cameras, projectors, magnifying observation machines, magnifying projectors, etc. (hereinafter, exposure apparatuses). And the like.

(B) Conventional technology In order to print or observe a sharp resolution in a photo enlarger, duplication, plate making and projector, magnifying observer, magnifying projector, and the like, the film must be held with good flatness.

Conventionally, in order to achieve the purpose, instead of sandwiching between two glass plates, the method of sucking and holding the film with good flatness on the glass is a method of directly sucking the film surface (Japanese Utility Model No. 45-12388) and There is a method in which a film is sandwiched between a glass plate and a suction base plate in which two thin plates are bonded together while leaving an air passage, and air is sucked from a side end of the film (Japanese Patent Laid-Open No. 57-38428).

(C) Problems to be Solved by the Invention The method of directly sucking a film surface has a drawback that a standard negative cannot be sucked because an image surface is cut off and an image is damaged.

And in the method of bonding two thin plates together and sucking from the side edge of the film, a small hole for suction is necessary at the side edge immediately on which the film is placed, so it is difficult to prevent air leakage, and it is still difficult for each film size It is necessary to join and manufacture various kinds of base plates having different positions of the suction holes.

Conventionally, since a rubber hose is directly connected to the base plate, the glass plate is attracted to the base plate during the operation of the pump, making it difficult to attach and detach the film, and the pump is stopped every time the film is replaced. There has been a problem that the rubber hose must be removed and the rubber hose must be replaced each time the base plate is replaced. That is, conventionally, there was a defect that the production was not easy, the operation was difficult, and the work efficiency was poor.

(D) Means for Solving the Problems The present invention aims to develop a film suction holding method which does not have the above-mentioned disadvantages, and aims to solve the object by the following method.

That is, according to the present invention, an air discharge hole for discharging air is provided on a base plate on which a film holding plate of a light source device having a light source is mounted, the air discharge hole is connected to a suction pump, and a portion corresponding to an image portion of the film is punched. A film holding plate provided with a small hole for suction at a position connected to the air discharging hole of the mounting table at the outer edge of the position where the film is mounted, while preventing air leakage when pressed with glass, This problem is solved by providing an air guide or a rubber plate and an air guide for inducing ventilation around the film (in the case of a cut film) or on both sides (in the case of a long-wound film).

(E) Action When the film is attached to the predetermined position of the light source device so that the film is pressed against the holding plate with glass, the suction hole below the holding plate and the suction connection hole on the light source device side are connected, so that the suction pump is operated. Then, the air existing between the film and the glass plate is discharged from the side end of the film, and the film is fixed to the glass plate by suction.

(F) Example FIG. 1 is a first example of a cut film of a film holding plate of the present invention, and FIG. 2 is an example of a light source device using the film holding plate.

The holding plate 2 shown in FIG. 1 has a perforated portion 3 punched into a size corresponding to the image size of the film, and suction holes 4a and 4b near the outer edge portion on which the film is placed. An air guide 5 for preventing the air flow and inducing suction is placed. The guide 5 has a thickness close to the thickness of the film, is punched out slightly larger than the film size, and when pressed by the glass plate 1, is sucked from the periphery of the film when sucked from the suction hole 4. It is arranged to form such an air passage 8.

When the film 7 is placed on this holding plate, sandwiched by glass, and inserted into the film holding plate insertion portion 11 of the exposure apparatus shown in FIG. 2, the suction hole 4 of the holding plate is moved to the mounting table 12 of the light source device.
Is connected to the air discharge hole 14 brought to the air. Therefore, when a suction pump (not shown) is operated, air is exhausted from the rubber hose 15 connected to 14, air remaining between the film 7 and the glass plate 1 is exhausted, and the film 7 is fixed to the glass plate 1 by suction. Will be done.

FIG. 3 shows an embodiment of an air guide used on a holding plate when a small film is adsorbed by the same light source device.

This embodiment corresponds to 120 and 135 films, assuming that FIG. 1 is a 4 × 5 inch size,
Adhesive fixation is possible as long winding. That is, the guides 5 are provided on both side surfaces of the long-wound film 7, and the cut portions are provided so as to form a ventilation path 9 through which the air flows from the suction hole 4 to the side end of the film when pressed with a glass plate. is there.

Therefore, when the holding plate is inserted into the light source device and sucked, air existing between the film 7 and the glass plate is discharged from the suction hole 4 and the air passage 8 formed by the gap between the film and the air guide.

In addition, 2 in FIG. 3 was manufactured as a rubber plate mask, and on a metal holding plate punched to the maximum image size,
Rubber masks of various sizes can be replaced.

FIG. 4 shows an embodiment of a suction adapter used when the base plate is used in a ready-made exposure apparatus. Although the ready-made exposure apparatus does not have a suction unit, this adapter is mounted on the base plate insertion part 11 of the light source device, a film holding plate is placed thereon, and air is exhausted from the air discharge fitting 22. When the air is exhausted, the air is exhausted from the suction hole 19 through the air passage 20 and the air passage 21 to cause the air exhaust hole 5 of the placed holding plate to be sucked.

Therefore, if this adapter is used, the ready-made light source device becomes a suction device similar to that of FIG. 2, and the film can be easily fixed to the plane by suction using the holding plate.

FIG. 5 shows an embodiment of the structure of the holding plate in order to perform suction more efficiently.

That is, the holding plate has ventilation passages 8 and 9 formed by V-shaped grooves at the side end positions where the film of the portion corresponding to the image portion is placed on which the film is placed. Since the mold ventilation path is formed, ventilation is good and efficient and quick suction is possible. By manufacturing this with a rubber plate, it can also play the role of preventing damage to the film at the same time, and it is also possible to make various film sizes with a rubber magnetized plate and make it interchangeable on a metal holding plate. it can. Note that this groove may be formed as a ventilation path by punching.

Another method for improving ventilation is to partially cut or corrode a holding plate or a glass portion corresponding to the space 9 between the suction hole 4 and the side edge of the film and the side edge 8 of the film. Thus, a groove can be provided to provide a more efficient suction effect.

In the above embodiment, the position of the holding plate is adjusted by connecting the suction hole 4 of the holding plate in a convex shape and the air discharge hole 13 of the light source unit mounting table in a concave shape or inverting the unevenness. Can be assured.

Also, when a stopper for positioning the film is provided on the base plate, the glass plate above the stopper is similarly cut or made a hole, and when a hole is made, the glass is covered with a thin film to prevent air leakage can do.

In the case of a duplication device, a magnifying observation device, an overhead projection device, or an exposure device in which the light source unit is located on the lower side and a film is positioned on a glass plate, a stopper is provided on the glass plate side, and a protrusion of the stopper is provided. It can be made to be inserted into the position of the suction hole without obstructing the ventilation.

In addition to the glass plate 1 being brought to the base plate side so as to be openable and closable, the glass plate 1 may be brought to the light source device side so that only the base plate is inserted and then the glass plate is pressed against a film.

Further, by inserting the holding plate, the on / off of the switch of the suction pump can be linked.

(G) Effects of the Invention According to the present invention, a single film holding plate and a glass plate enable the film to be suctioned in a plane, and even if the film size is different, the length of the air passage 9 of the air guide is reduced by the suction hole 4. Can be adjusted according to the distance from to the side edge of the film, so that the suction hole is not limited to the side edge position of the film as in the past, but can be provided at a slightly distant position, making it easy to manufacture This can be performed without connecting a rubber hose to the holding plate itself as in the conventional case, so that the operability is improved and the work can be performed very efficiently and quickly.

That is, the purpose is achieved by a simple structure in which the holding plate itself has a suction hole other than the image portion,
Since there is no rubber hose, there is no difference from the non-adsorption type, and since the film is adsorbed only when it is inserted into the light source device, it is possible to change the film quickly and easily as with a normal non-adhesive holding plate .

Conventionally, a dedicated base plate was required for each film size.However, in the present invention, it is possible to suction films of various sizes by simply replacing the rubber plate mask with the same holding plate, and replacing the holding plate. In such a case, it is not necessary to attach and detach the rubber hose as before.

In other words, it is easy to manufacture and inexpensive, and the operability is largely the same as that of the non-adsorption type.

Moreover, since the light source device itself only provides the suction holes 13 in the base plate mounting table 12, the implementation is easy,
According to the method using the suction adapter shown in FIG. 4, the light source device itself does not require any processing, and the present invention can be easily implemented.

Therefore, conventionally, it was necessary to manufacture a dedicated base plate according to each model and film size, but in the present invention, by using a suction adapter, a product that is compatible with a wide range of models is manufactured. There is an effect that can be done. That is, the same film holding plate can be used in common even if the type of the exposure apparatus is different.

Also, the structure of the holding plate can be achieved by simply providing the suction hole 4 and the air guide 5 or the rubber plate in the same simple structure as a general single-panel type negative carrier. It can be easily converted to a suction type film holding plate.

[Brief description of the drawings]

FIG. 1 is a front view and A is a side view of the film holding plate. In the figure, 1 is a glass plate, 2 is a holding plate, 3 is an opening,
Represents a suction hole, 5 represents an air guide, 6 a punched line of an air guide, 7 represents a film, and 8 represents a ventilation path formed by a gap between the film and the air guide. FIG. 2 is a side view of a film holding plate insertion portion of a light source device having a printing and observation light source. In the figure, 10 is a light source side main body,
Reference numeral 11 denotes a film holding plate insertion portion, 12 denotes a holding plate mounting table, 13 denotes an air discharge hole, 14 denotes a rubber hose, 15 denotes a bellows, and 16 denotes a lens. 3A and 3B are a front view and a side view, respectively, showing a holding plate for a long-wound film. Reference numeral 2 denotes a holding plate, 3 denotes an opening, 4 denotes a suction hole, 5 denotes an air guide, 7 denotes a film, 8 denotes a ventilation path formed by a gap between the film and the air guide, and 9 denotes a ventilation path. FIG. 4 is a front view and a side view of the suction adapter A to be attached to the light source device. In the figure, 17a is an upper plate, 17b is a joint, 17c is a lower plate, 18 is an opening, 19 is a suction hole, 20 is an air discharge hole of the upper plate, 21 is a ventilation path, and 22 is an air discharge fitting. FIG. 5 is a front view and FIG. 5B is a side view showing an embodiment in which a groove is formed in a holding plate for efficient ventilation to form a ventilation path. In the drawing, reference numeral 8 denotes a groove-shaped air passage formed at the side end of the film, and 9 denotes a groove-shaped air passage that allows air to pass through the suction hole 8.

Claims (3)

(57) [Claims] 1. A mounting table for a film holding plate of a main body 10 of a light source device.
An air discharge hole 13 is provided at 12 and connected to a suction pump by a rubber hose 14, an opening 3 punched out of a portion corresponding to an image portion of the film, and a suction hole 4 at a position outside the side end where the film is placed. The air passages 8 and 9 are formed around or on the side edge of the film when pressed with the glass plate 1 on the film holding plate that has brought the above, so that air is sucked from the side edge 8 of the film. When the film holding plate provided with the air guide 5 is inserted into the holding plate insertion portion 11 of the light source device, the suction hole 4 of the holding plate is formed.
And the air discharge hole 13 of the mounting table of the light source device are connected, and when the suction pump is operated, the film 7 on the holding plate and the glass plate 1
A film 7 is suction-fixed to the glass plate 1 by discharging air between the film 7 and the suction hole 4. 2. A light source device, comprising two thin plates having an opening 18 punched out of a portion corresponding to an image portion, a suction hole connected to a suction hole 4 of a film holding plate 2 in an upper plate 17a. 19, an air discharge hole 20 is provided at the other end of the lower plate, and a suction adapter, which is joined while leaving an air passage 21 therebetween, is attached to the light source device, and the holding plate is inserted thereover so that the film is made of glass. 2. The method for adsorbing and holding a film according to claim 1, wherein the film is adsorbed and fixed to a plate. 3. A film holding plate or a rubber mask having ventilation paths 8, 9 formed by grooves or punching between the suction hole 4 and the side edge of the film and at the side edge of the film.
The method for adsorbing and retaining a film according to the above item.