JPH02232648A - Back film - Google Patents

Abstract

PURPOSE:To allow taking out of sheet films while the films are packaged by each sheet and light shielded in bags simply by drawing out leader paper by providing an engaging means for drawing out the sheet film unit in the state of being superposed on a light shielding part and a means for adhering a back sheet and the light shielding part. CONSTITUTION:The light shielding part 29 housed between a pressure plate 12 and a bottom cap 11 is drawn out and is moved onto the sheet film 21. The exposed sheet film unit 18 which is superposed on the light shielding part 29 is then successively drawn out at the time when the light shielding part 29 is drawn out of a drawing out port. The sheet film 21 is pressurized or heated during this time and is enveloped by the back sheet 19 and the light shielding part 29, by which the light shielding state is established. The leader paper 24 is alternately arranged with exposing parts 27 and the light shielding parts 29 and the number of the arrangements is previously mated with the number of the sheet films 21, by which the drawing out and light shielding of plural sheets of the sheet films 21 are enabled. The sheet films are less bulky at the time of carrying and the taking out of the photographed sheet films by each piece in the completely light shielded state is possible even in the case of a large number of photographing times.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pack film in which exposed sheet films are housed one by one in a light-shielding bag and can be removed from a film bag. (Prior art) Conventionally, a large sheet film of about 4 x 5 inches has been sealed in a hard light-shielding bag made of light-shielding paper and attached to a carrier sheet. It is known that this light-shielding bag is set in a film holder that has exposure openings on both sides.A sheet film is attached to both the front and back sides of the carrier sheet, and the light-shielding bag is placed in a film holder with exposure openings on both sides. Pull it out from the carrier sheet and take a picture.This exposes the sheet film on one side of the carrier sheet.When exposing again, turn the film holder over, reload it, and then pull out the light-shielding bag. Photographing is carried out. After both films are exposed, the exposed film is covered with the light-shielding bag to shield it from light, and in this state it can be taken out from the film holder.

[Problem to be solved by the invention]

However, with the above method, handling such as putting in and taking out the light-shielding bag is troublesome. There is also a problem with the reliability of whether or not the light is completely blocked. Furthermore, if three or more shots were required, it was inconvenient to carry multiple light-shielding bags and carrier sheets. [Objective of the Invention] The present invention is easy to handle, does not take up much space to carry even when many shots are taken, and allows sheet film to be taken out one by one while completely shielded from light. The purpose is to provide a pack film that is [Means for Solving the Problems] In order to achieve the above object, the present invention includes a sheet film unit with a back sheet stacked and stored between an outer cover with an exposure opening and a pressure plate, and In a pack film equipped with a leader paper to pull out the sheet film unit from the drawer opening, the sheet film is folded and stored between the pressure plate and the bottom cover before being pulled out, and has an exposure section with an opening that exposes the sheet film and the entire surface of the sheet film. A bendable leader paper in which light-shielding portions are arranged alternately, and an engagement for pulling out the sheet film unit while overlapping the light-shielding portions when the leader paper is pulled out from the drawer opening after passing over the sheet film. and an adhesive section for bonding the light-shielding section and the backing sheet while covered with the sheet film. [Operation] During shadowing, an aperture is located on the sheet film, and the sheet film is exposed through the exposure aperture in the outer cover. When the leader paper is pulled out after exposure, the aperture passes over the exposed sheet film, and along with this, the light-shielding part housed between the pressure plate and the bottom cover is pulled out and moved onto the sheet film. Further, as the drawing continues, when the light shielding part is pulled out from the drawer opening, the exposed sheet film unit is overlapped with the light shielding part and pulled out by the engaging means. During this time, pressure or heat is applied to bond the backing sheet and the light-shielding part, so the sheet film is wrapped by the backing sheet and the light-shielding part and becomes in a light-shielding state.
Since the leader paper has exposed areas and light shielding areas arranged alternately, by matching the number of arrays to the number of sheet films, it is possible to draw out and shield light from multiple sheets of film. Furthermore, since the sheet film only moves in a straight line when being pulled out, it is possible to suppress the occurrence of scratches due to bending. Embodiments of the present invention will be described below with reference to the drawings.

〔Example〕

In FIG. 1 showing an exploded view of a film bag according to an embodiment of the present invention, a film pack 10 includes a bottom I1l made of a thin metal plate that provides elasticity, a pressure plate I2, and a material made of, for example, high impact polystyrene. It consists of an outer lid 13 obtained by molding. The bottom cover l1 is formed with spring plate parts l4 bent inward on both sides thereof, and presses the leg parts 16 of the press 12 to urge the press 12 upward. The bottom cover 1l is attached to the outer II 13 so that the pressure plate 12 is sandwiched between the outer M13 and the bottom cover 11. For example, a stack of 12 film units 8 is placed on the pressure plate l2. This film unit l8 is
A sheet film 21 is attached to the back sheet 19,
Furthermore, an engagement piece 22 is provided at the end on the pull-out direction A side. As this backing sheet 19, a light-shielding film or plastic film is used. An adhesive layer 28 to which a microcapsule adhesive is densely adhered is provided around the sheet film 21. Microcapsule adhesives have a fine capsule structure and normally do not adhere even if they come into contact with each other, but when pressure is applied, the microcapsules break and the adhesive filled inside is exposed and becomes adhesive. It is.

A leader paper 24 is pulled out above the pressure plate 12 through a folded part 23 formed in a rounded bend at the left end of the pressure plate 12. The leader paper 24 is made of flexible light-shielding paper, and includes an exposure section 27 having an opening 26 sized to mask the sheet film 21, and a light-shielding section 29 that shields the entire surface of the sheet film 21 from light without any defects. It is composed of alternating rows. Further, the exposure section 27 and the light shielding section 29 form one set, and a perforation 31 is provided at the boundary between the two and the next set. The leader paper 24 is usually folded at the boundary between the exposure part 27 and the light shielding part 29 as shown in the figure, and a total of 12
In the stored trap, the rear edge 26a defining the left end of the opening 26 engages with the engagement piece 22 to pull out the film unit l8.

An opening 32 is formed on the upper surface of the outer cover 13, and this frontage 32
The sheet film 2l is exposed through the. Also, outside I
A pull-out opening 33 for the film unit l8 and the leader paper 24 is formed in the right end of I13, and the exposed film unit is pulled out from this pull-out opening 33. The operation of this embodiment having the above configuration will be explained below. When the film pack 10 is loaded into a holder for mounting on a camera, the tip of the exposure section 27 on the pressure plate 12 is inserted into the holder (not shown) as shown in FIG. 3(A). It is inserted between the provided pressure rollers 34 and 36. At this time, since the exposure section 27 is present on the sheet film 21, the opening 32 is opened by the camera release operation.
Exposure is performed through and 26. When the pressure roller 34 is rotated by the motor after the exposure is completed, the leader paper 24 is transferred in the drawing direction A. Since the film unit 11 is pressed against the inner wall of the outer II 13 by the pressure plate 12, when the rear end edge 26a of the opening 26 reaches the engaging piece 22 as the leader paper 24 is pulled out, as shown in FIG. It engages with the engagement piece 22 in this manner. At this time, the sheet film 21 is completely covered by the light shielding part 29. After this, as the pressure roller 34 continues to rotate, the back sheet 19 is pressed against the leader paper 2 by the engaging piece 22.
4 and is transported together with the leader paper 24, the adhesive layer 28 is pressed immediately after the engaging piece 22 passes the pressing roller 34, as shown in FIG. As a result, the microcapsule adhesive is broken and the back sheet 19 is adhered to the light shielding part 29. As a result of the subsequent transfer, the leader paper 24 pulls out the film unit l8 via the engaging piece 22, as shown in FIG. 3(C).
As a result, the adhesive layer 28 further adheres to the rear, and the next exposed section 27 is pulled out from under the pressure plate 12 via the folded section 23. Then, when the leader paper 24 is transferred by the length of the set of exposure section 27 and light shielding section 29 (distance M from the tip of the leader paper 24 to the perforation 31), the rotation of the pressing roller 34 is stopped. ．． At this time, the microcapsules in all of the adhesive layer 28 are broken, so that the back sheet 19 and the light shielding part 29 are bonded around the sheet film 2l. In addition, the next set of exposure sections 27
The tip of the sheet has slightly passed through the pressure roller 34, and the exposed film unit can be separated from the exposed film 24 by breaking at the perforation 3l. At this point, the film unit 18 to be exposed next is located at the top, and is in a state similar to the initial state shown in FIG. Separated film unit I8 and light shielding part 2! By cutting off the hat, redundant exposed portion 27, etc., a bag-like shape is formed as shown in FIG. 4, and the exposed sheet film 21 is shielded from light. In this state, you can submit 2 liters of sheet film to the photo lab. Note that perforations may be provided to separate the exposure portion 27 and the like. By repeating the above-described operations, it is possible to pull out and light-shield 12 sheet films using one leader paper.

Although omitted above, the sheet film 2 is in the initial state.
A light-shielding cover sheet may be added to the tip of the first exposure section 27 in order to shield it from light. In this way, by pulling out the cover sheet after loading the film bag 10, the first exposure section 27 is pulled out onto the film unit 18, and only then does the sheet film 21 become exposed and photographable. Further, the adhesive layer 28 may be provided only on the light shielding portion 29 side, or may be provided on both the light shielding portion 29 and the back sheet 19. Furthermore, hot melt adhesive may be used as the adhesive. In this case, the pressing row, the roller 34
, 36 is replaced by a heat roller. In the above example, the film unit 18 is pulled out together with the leader paper 24 by rotating the pressure rollers 34 and 36 using the motor, but the tip of the leader paper 24 may be pulled by hand. [Effects of the Invention] As explained above, the present invention provides a flexible leader paper in which exposed parts and light-shielding parts are arranged alternately, and a light-shielding leader paper when the leader paper is pulled out from a drawer opening after passing over a sheet film. Since we have provided an engaging means for pulling out the sheet film unit in an overlapping state, and a means for gluing the backing sheet and the light shielding part, just by pulling out the leader paper, the sheet film unit can be placed one by one into a bag. It can be taken out while being wrapped in and shielded from light.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a film bag according to an embodiment of the present invention. Figure 2 is a sectional view of the main part of the film back shown in Figure 1. FIG. 3 is an explanatory diagram showing the operation of the packed film according to the embodiment of FIG. 1. FIG. 4 is a schematic diagram of the exposed sheet film in a light-shielded state according to the embodiment shown in FIG. E0...Film back II...Bottom cover 12...Press plate 13...Outer cover 1 8 ・ 1 9 ・ 2 1 ・ 22 ・ 24 ・ 26 ・ 26a 27 ・ 28 ・ 29 ・ 3 1 ・ Film unit back sheet Film engaging piece Leader paper opening/rear edge exposed area Adhesive layer Light shielding area Perforation,

Claims (1)

[Claims] (1) Equipped with a sheet film unit with a backing sheet that is stacked and stored between an outer cover with an exposure opening and a pressure plate, and a leader paper from which the sheet film unit is pulled out from a drawer opening provided at one end of the outer cover. In a pack film, the film is folded and stored between the pressure plate and the bottom cover before being pulled out, and is a flexible film with an exposure section that has an opening that exposes the sheet film and a light-shielding section that blocks light from the entire surface of the sheet film arranged alternately. When pulling out the leader paper from the drawer opening after passing over the sheet film,
A pack film characterized in that it is provided with an engaging means for pulling out the sheet film unit in a state where it overlaps with the light shielding part, and an adhesive part that adheres the light shielding part and the back sheet in a state where the sheet film is covered.