JP2002318435A - Instant film pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a case formed of paper material that has improved rigidity and air-tightness in the vicinity of an insertion aperture to which a pressing member for pressing an instant film to an exposure aperture is inserted. SOLUTION: The cover plate 36 of a back film cover 6 superposed on the instant film 4 and housed in the case together with the film 4 is formed of the paper material. The plate 36 is attached to the inner wall surface of a bottom board 15 by a weak sealing agent with which a weak seal part 15b is coated, and covers the insertion aperture 26 so as to hermetically seal the case. A pressing piece 37 for pressing the center part of the film 4 in order to press the film 4 to the exposure aperture 12 side is attached to the center part of the plate 36. The pressing piece 37 is also formed of the paper material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instant film pack containing a plurality of instant films in a paper case.

[0002]

2. Description of the Related Art Various types of instant film packs (hereinafter abbreviated as "film packs") in which a plurality of mono-sheet type instant films are stored in a box-shaped case are on sale. The case is formed in a box shape from light-blocking plastic, and has an exposure opening for exposing the exposed surface of the film unit, a groove-shaped outlet for discharging the exposed film unit, and an instant film. And an insertion opening into which a pressing member that pushes up toward the opening is inserted.

[0003] In the case, a sheet-shaped front film cover that is stacked in front of the instant film and closes the exposure opening from the inside, and a rear film cover that is stacked behind the instant film and closes the insertion opening from the inside are stored. Have been.

A film pack is used for an instant camera, a camera back, and the like, and is set together with a case in a pack room provided in these devices. The above-described pressing member is attached to a lid member that opens and closes the pack chamber,
When the lid member is closed, the pressing member is inserted into the insertion opening of the film pack. Then, the front film cover is discharged by the initial operation of the camera. When all of the stored instant films have been used, the empty case is discarded as non-combustible plastic waste.

[0005]

In the conventional instant film pack for amateur photographers, it is difficult to collect and recycle used cases. For this reason, used cases have been disposed of as general waste and incinerated or landfilled. This was not a favorable state from the viewpoint of waste reduction and environmental protection.

In order to solve the above problem, it is conceivable to form the case with paper material. However, due to distortion of the case due to low rigidity, a gap is formed between the insertion opening and the rear film cover, so that an instant film is formed. There was a concern that the light would be exposed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to improve rigidity and confidentiality in the vicinity of an insertion opening of a case made of paper.

[0008]

In order to solve the above problems, an instant film unit according to the present invention comprises a paper cover plate for closing an insertion opening from the inside, and an instant film unit mounted on the cover plate for exposing the instant film. A rear film cover is constituted by a paper pressing piece pressed against the opening. Further, a notch may be formed in the cover plate to avoid interference with the claw claws.

Further, the pressing piece is provided so as to press between the pod portion and the trap portion of the instant film, and is formed in a substantially triangular shape.

[0010] The rear film cover is weakly sealed around the insertion opening of the case.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A film pack 2 shown in FIGS. 1 to 3 has a substantially box-shaped case 3 and a plurality of instant films 4 stored in the case 3 in a stacked state.
The instant film 4 includes a front film cover 5 and a rear film cover 6 that are incorporated into the case 3 so as to sandwich the instant film 4 therebetween. Case 3 and front film cover 5
The rear film cover 6 is formed of a paper material.

The instant film 4 is a well-known mono-sheet type self-developing film unit, and is a photosensitive sheet on which a latent image is formed by exposure, and an image receiving device on which a positive image is transferred from the latent image via a developing solution. The sheet is overlapped, and a pod portion 8 and a trap portion 9 are provided at an end thereof. The pod portion 8 has a built-in developing solution pod containing a developing solution, and the trap portion 9 has a built-in absorbing material for absorbing excess developing solution after the developing process. This instant film 4
After the exposure is performed on the exposure surface 10, the developing solution pod is crushed by a pair of developing rollers, and the developing solution flows out between the two sheets to perform the developing process. After a predetermined developing and fixing time has elapsed after the developing process, a positive image appears on the surface opposite to the exposure surface 10.

The case 3 has a tray-shaped case body 14 in which an exposure opening 12 for exposing the exposure surface 10 of the instant film 4 is formed on one surface, and a surface 13 facing the exposure opening 12 is opened. And a bottom plate 15 for closing the open surface 13 of the case body 14. Below the exposure opening 12, a claw notch 16 provided in the instant camera, into which a claw claw enters, and an engagement notch 17 for engaging the front film cover 5 with the case body 14 are formed.

The case body 14 folds the paper material 18 punched into the shape shown in FIG. 4 inward by a dashed-dotted line and outwards by a dashed line, and also folds four corners of the folded-out portion 18a outward to adhere necessary parts. Thus, it is formed in a tray shape. A flange 19 is formed on the outer periphery of the open surface 13 of the case body 14 so that an edge 18b of the paper material 18 is folded and protruded outward.

As shown in FIG. 5, the paper material 18 forming the case body 14 is made of white paper 2 having a decorative print on its surface.
1 and carbon black etc. are mixed to increase the light shielding property,
It is composed of black paper 22 adhered to white paper 21 and polyethylene (PE) layers 23 and 24 covering the surfaces of white paper 21 and black paper 22 to provide moisture-proof and heat-sealing properties. The PE layer 24 that covers the black paper 22 may be mixed with a light-shielding substance to make it black, thereby giving light-shielding properties.

The white paper 21 and the black paper 22 can be obtained in a single step using a round-mesh multilayer paper machine, or separate white paper and black paper may be bonded together. Further, carbon black may be added to an adhesive for bonding white paper and black paper to compensate for light shielding. Furthermore, since the PE layers 23 and 24 have both moisture-proof properties and heat-sealing properties, it is preferable to provide them on both sides in order to form a pack. However, since it is also possible to seal with an adhesive, a PE layer may be provided only on one of the two surfaces. Further, instead of PE, OPP (oriented polypropylene) may be used.

The bottom plate 15 of the case 3 is made of a paper material of the same quality as the paper material 18 of the case body 14, or a white paper,
Black paper is formed of a slightly thicker paper material. Further, two paper materials having the same thickness as the paper material 18 may be stacked. The bottom plate 15 has two insertion openings 26 into which a pressing member for pushing up the stored instant film 4 toward the exposure opening is inserted. The bottom plate 15 has a bonding portion 15 a, which is cross-hatched in the drawing, bonded to the flange 19 of the case body 14, and closes the open surface 13 of the case body 14. In addition, by bonding with the bonding portion 15a, the strength of the case main body 14 increases.

A discharge port 28 for discharging the front film cover 5 and the instant film 4 out of the case 3 is formed on one side surface of the case body 14. This outlet 28
Consists of a horizontal slit 28a formed along the width direction of the case body 14, and a short vertical slit 28b formed at both ends of the horizontal slit 28a and formed perpendicular to the horizontal slit 28a. It has a shape. The front film cover 5 and the instant film 4 are discharged from the case 3 by pressing and bending the side surface of the case body 14 along the vertical slit 28b to open the discharge port 28.

In a conventional plastic case, an opening having a width as small as the thickness of the instant film 4 is formed as an outlet. However, in the case 3 of the present embodiment formed of a paper material having low rigidity, if an opening is formed in the discharge port portion, the case is deformed at the opening portion, and external light passes through other openings such as the exposure opening 12. It may get inside the case 3. For this reason, in the present embodiment, only a substantially U-shaped slit is formed in the case 3 to prevent a decrease in strength near the outlet when not in use.

Outside the outlet 28, a flap sheet 30 made of a light-shielding paper material is weakly sealed. The flap sheet 30 closes the outlet 28 in a light-tight manner and is bent at a right angle, thereby contributing to an improvement in rigidity near the outlet of the case body 14. The flap sheet 30 is pressed by the front film cover 5 at the time of discharge and peels off from the case main body 14 to expose the discharge port 28. Note that, apart from the flap sheet 30, a paper reinforcing sheet may be attached to the vicinity of the discharge port 28 from inside the case body 14.

As shown in FIG. 6, the front film cover 5
Is formed by folding a rectangular paper material 32 composed of white paper and black paper and a PE layer into two pieces, like the paper material, and bonding the cross-hatched portion 32a on the inside.

As shown in FIG. 7, the unbonded portion at the rear end of the front film cover 5 is formed as a bag-shaped slot portion 33. The lower piece 12 a of the exposure opening 12, which is formed into a protruding piece by the notches 16 and 17, is inserted into the slot 33. Thereby, the degree of adhesion of the front film cover 5 to the exposure opening 12 is improved, and the exposure opening 1 of the case body 14 is improved.
Since the rigidity of the periphery 2 is improved, it is possible to prevent external light from entering from the exposure opening 12 due to distortion of the case body 14 or the like. At the lower end of the front film cover 5, a light shielding sheet 34 made of paper for covering the claw notch 16 from the inside is adhered.

As shown in FIG. 8, the rear film cover 6
The cover plate 36 covers the insertion opening 26 of the bottom plate 15 from the inside of the case 3, and a substantially triangular pressing piece 37 attached to the center of the front surface of the cover plate 36. The pressing piece 37 does not necessarily need to be substantially triangular, and may be any as long as it can press between the pod 8 and the trap 9. When the cover plate 36 is pressed by the pressing protrusion 56 of FIG. 12, the pressing piece 37 presses the central portion of the instant film 4.
Thereby, the pressing piece 37 serves as a fulcrum, and both ends of the cover plate 36 press the pod 8 and the trap 9 of the instant film 4, and the close contact between the instant film 4 and the periphery of the exposure opening 12 is improved. improves. Therefore, the pressing projection 56 is formed between the end of the pod 8 and the pressing piece 37.
And between the end of the trap portion 9 and the pressing piece 37, and the pressing piece 37 is preferably provided so as to be located between the two pressing protrusions 56.

The cover plate 36 is made of a paper material composed of white paper and black paper and a PE layer similarly to the paper material 18. The weak seal portion 15b shown by hatching in FIG. 2 may be weakly sealed to the bottom plate 15 to close the insertion opening 26, thereby improving the rigidity and tightness of the case 3. A notch 36a is formed at one corner of the cover plate 36 to avoid interference with a claw of an instant camera or the like. The pressing piece 37 presses the central portion of the instant film 4 to expose the exposure opening 1.
2 to prevent a gap from being formed between the exposure opening 12 and the front film cover 5.

As shown in FIG. 9, the film pack 2
The case 3 is packaged and shipped with the side surface exposed to the outside. The packing strip 40 for packing the film pack 2
A protruding piece 42 having a hole 41 to be hung on a hanger in a store or the like is provided at an upper portion thereof.

The wrapping band 40 is obtained by folding a band-shaped paper material 44 punched into the shape shown in FIG. 10 inward by a dashed line and outward by a dashed line, and bonding a cross-hatched portion, as shown in FIG. It is formed in the wrapping band 40 of such a form. The film pack 2 is inserted into the wrapping band 40 from the lower end, and the wrapping band 40 is wrapped around the outer periphery of the film pack 2 for wrapping. The hatched portion on the inner surface side of the wrapping band 40 is pattern-coated with a weak seal material, and adheres to the surface of the case 3 when the film pack 2 is stored, so that the exposure opening 1 of the film pack 3 is exposed.
2. The outlet 28, the insertion opening 26 and the like are sealed. Thus, dust and dust do not enter the case 3.

The paper material 44 is, like the paper material 18 of the case body 14, made of white paper having a decorative print on its surface, mixed with carbon black or the like to enhance the light-shielding property, and is made of black paper bonded to the white paper. It consists of paper and a PE layer which covers the surfaces of white paper and black paper to provide moisture proof and heat sealing properties. In the wrapping by the wrapping band 40, a part of the case 3 is exposed to the outside,
Since the paper 18 of the case 3 is also provided with a moisture-proof PE layer similarly to the wrapping band 40, the instant film 4 is not deteriorated by humidity. Case 3
Since the light-shielding property is given to itself, the paper 44 does not need to use black paper for giving the light-shielding property.

The film pack 2 is used by being loaded into a pack loading chamber provided in an instant camera, a camera back, or the like. As shown in FIG. 12, the pack loading chamber 47
When the film pack 2 is loaded into the case 3, the front face of the case 3 of the film pack 2 where the exposure opening 12 is formed is the receiving surface 48.
And positioned. Since the film pack 2 has a flange 19 protruding outward for bonding the case body 14 and the bottom plate 15, the pack loading chamber 47 is provided.
There is no erroneous loading such as loading from the bottom plate 15 side.

In the receiving surface 48 of the pack loading chamber 47, an aperture opening 50 for defining an exposure range to the instant film 4 is formed at a portion facing the exposure opening 12. Further, a claw 51 constituting a well-known claw mechanism enters into the notch 16 of the case 3, and when the front film cover 5 and the instant film 4 are discharged, the lower ends of the front film cover 5 and the instant film 4 are hooked and rise. And scrape it out of Case 3.

A pack loading lid 53 for opening and closing the pack loading chamber 47 is rotatable via a hinge 54. A pressing member 55 is provided on the inner surface of the pack loading lid 53 to enter the insertion opening 26 of the film pack 2 and press the rear film cover 6. This pressing member 5
5 is a pressing projection 56 which enters the inside of the film pack 2 through the insertion opening 26 and directly contacts the rear film cover 6.
And a spring 57 for urging the pressing projection 56, and a holding frame 58 for holding the pressing projection 56 and the spring 57.

A developing roller 60 is provided above the pack loading chamber 47. After the exposure is given, the instant film 4 scraped out of the case 3 by the claw 51 is conveyed toward the film outlet of the instant camera while the developing solution pod is crushed by the developing roller 60. The developing solution flowing out of the developing pod is developed between the photosensitive sheet and the image receiving sheet, and performs a predetermined developing and fixing process.

Next, the operation when the film pack of the above embodiment is set in an instant camera will be described. As shown in FIG. 9, the film pack 2 is
Are shipped in a state of being exposed to the outside in the packaging band 40. At a store or the like where the film pack 2 is sold, the sales are suspended by hanging a hole 42 formed in the protruding piece 41 on a hanger.

As shown in FIG. 11, the user who has purchased the film pack 2 peels off the adhesive at the end of the wrapping band 40 and takes out the film pack 2 from the wrapping band 40. At this time, the weak seal that has adhered the inner surface of the packaging band 40 to the surface of the case 3 is peeled off.

The removed film pack is placed in the outlet 2
8 is covered by the front film cover 5, the exposure opening 12 is covered by the front film cover 5, and the insertion opening 26 is covered by the rear film cover 6, so that external light enters the case 3 to expose the instant film 4. It won't.

Although the case 3 is made of paper, it has a low rigidity. However, since the discharge port 28 is a slit provided on the side surface of the case 3, the effect of the decrease in rigidity on the case is small. Since the rigidity 30 near the outlet 28 is improved, external light does not enter from the exposure opening 12 due to the distortion of the case 3 near the outlet 28. Further, as shown in FIGS. 3 and 7, the slot at the rear end of the front film cover 5 sandwiches the lower piece 12a of the exposure opening 12, so that the rigidity does not decrease below the exposure opening 12.

The film loading cover 53 is opened, and the film pack 2 is set in the pack loading chamber 47 in a direction in which the exposure opening 12 faces the receiving surface 47. Since the case 3 has the flange 19 protruding outward, erroneous loading such as loading the film pack 2 from the bottom plate 15 side does not occur.

Thereafter, when the pack loading lid 47 is closed, the pressing projection 56 is inserted from the insertion opening 26 into the film pack 2.
And presses the rear film cover 6 from two places. After being pressed, the film cover 6 is inserted into the insertion opening 26.
Is peeled off and moves toward the instant film 4 in the case 3. Rear film cover 6
Presses up the central portion of the instant film 4 with the pressing piece 37, and pushes the instant film 4
Push up the end of the.

When the pack loading cover 53 is closed, the work of discharging the front film cover 5 is performed. The claw 51 is
While entering through the notch 16, it engages with one end of the front film cover 5 and scrapes it out toward the discharge port 28. At this time, the front film cover 5 is attached to the outlet 28
4 is pressed and bent along the notch to form an outlet 28. Then, peel off one end of the flap sheet 30,
It is discharged out of the case 3 through the discharge port 28.

When the front film cover 5 is removed, the exposure surface 10 of the instant film 4 faces the exposure opening 12, and the preparation for exposure is completed. The instant film 4 is pressed by the rear film cover 6 from the rear side thereof toward the exposure opening 12, so that the
The exposure range of the frontmost instant film 4 facing 2 is defined.

When exposure is performed for the instant film 4 in the front row, the discharging process is performed in the same manner as the discharging operation of the front film cover 5. The claw 51 engages with the lower end of the exposed instant film 4 and
Discharge this from 8. When the pod portion 8 is caught between the developing rollers 60, the developing solution pod is crushed and the developing solution is developed, and the claw 51 is retracted.

Subsequently, the developing solution is developed, and at the same time, the instant film 4 is transported out of the camera. When the exposed film is completely discharged from the discharge port 28, the push-up member 55 causes the next row of instant films 4 to face the exposure opening 12, and the preparation for the next photographing is completed. On the other hand, the exposed film conveyed outside the camera is transferred with a positive image after a predetermined development and fixing time, and is used as a desired print photograph.

In this way, the shooting is sequentially performed,
After all of Instant Film 4 has been used up,
The pack loading lid 53 is opened, and the empty case 3 is taken out. The removed case 3 is discarded as a combustible material, or is recycled for recovery of used paper.

In the above embodiment, the notch 1 for the claw is used.
6, the notch 17 for engagement was formed.
Instead of not providing 7, a notch may be provided in the upper sheet of the front film cover 5.

[0044]

As described above, according to the instant film pack of the present invention, the opening of the inner wall of the case is closed by attaching the paper pressing piece for pressing the instant film to the exposure opening to the rear film cover. The pressing of the instant film against the exposure opening can be performed with a paper material.

[Brief description of the drawings]

FIG. 1 is an external perspective view of an instant film pack embodying the present invention.

FIG. 2 is an exploded perspective view showing the configuration of the instant film pack.

FIG. 3 is a sectional view of a main part of the instant film pack.

FIG. 4 is a development view of a case main body.

FIG. 5 is a cross-sectional view of a main part showing a configuration of a paper material of a case body.

FIG. 6 is a development view of a front film cover.

FIG. 7 is an explanatory view showing an engaged state of a case main body and a front film cover.

FIG. 8 is an exploded perspective view showing a configuration of a rear film cover.

FIG. 9 is an external perspective view of an instant film pack packed in a packing band.

FIG. 10 is a development view of a wrapping band.

FIG. 11 is an external perspective view of a packaging band and an instant film pack.

FIG. 12 is a sectional view of a main part of a pack loading chamber of the instant camera.

[Explanation of symbols]

 2 Instant film pack 3 Case 4 Instant film 5 Front film cover 6 Rear film cover 12 Exposure opening 14 Case body 15 Bottom plate 18 Paper material 19 Flange 40 Packaging band

Claims (5)

[Claims] An exposure opening for exposing an exposed surface of the instant film; a discharge opening for discharging an exposed instant film; and an exposure opening for exposing the exposed surface of the instant film. In an instant film pack comprising a box-shaped case provided with an insertion opening into which a pressing member for pushing up the instant film is inserted toward, and a film cover that is stacked under the instant film and covers the insertion opening from the inside, and Wherein the rear film cover comprises a paper cover plate closing the insertion opening from the inside, and a paper pressing piece attached to the cover plate and pressing the instant film against the exposure opening. . 2. The instant film pack according to claim 1, wherein a notch is formed in the cover plate to avoid interference with a claw for discharging the instant film from the case. 3. The instant film pack according to claim 1, wherein the pressing piece is provided so as to press between a pod portion and a trap portion of the instant film. 4. The instant film pack according to claim 1, wherein the pressing piece has a substantially triangular shape. 5. The rear film cover is weakly sealed around an insertion opening of the case.
5. The instant film pack according to any one of items 4 to 4.