JP2000122252A - Instant film pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make all components of a pack main body housing a peel-apart type instant film unit of plastics. SOLUTION: An upper case 52, a film pressing plate 53, and a bottom cover 54 are constituted of plastic moldings. A pair of wing piece 62 is integrated with the bottom plate part 60 of the bottom cover 54, and a control piece 65 is integrated with a film unit ejecting port side. The pair of wing piece 62 is pressed by the leaf spring of a pack holder used at the same time when the film pack is used. The wing pieces 62 enter inside a notch 55 formed on the side wall of the upper case 52, and push the plate 53 up through the lower edge of a side plate part 58. Thus, the positioning of the film pack inside the pack holder and that of the film unit inside a pack main body are performed.

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 peel apartment type instant film unit.

[0002]

2. Description of the Related Art Self-developing type instant film units include a mono-sheet type and a peel apartment type. As described in Japanese Utility Model Publication No. 5-62725, a peel apartment type instant film unit (hereinafter, simply referred to as a film unit) stores a photosensitive sheet and an image receiving sheet in a separated state in a pack body. are doing. When the drawer sheet is pulled out from between the pair of developing rollers after exposure, the two are superimposed, and in the process of being pulled out, the pod containing the developing solution is crushed, and the developing solution is filled between the photosensitive sheet and the image receiving sheet. Be expanded.

FIG. 3 shows the structure of a conventional pack body used for storing a peel apartment type film unit. The pack body 2 includes an upper case 4 that forms an upper surface of a box-shaped case body having a substantially rectangular parallelepiped shape, a bottom lid 6 that covers a bottom opening of the upper case 4 and forms a bottom surface of the case body, The upper case 4 is formed with an exposure opening 3. The upper case 4 is made of a plastic injection-molded product because light-shielding is particularly ensured particularly at corners and the manufacturing cost can be reduced. The lower edge of the front wall 7 is higher than the lower edge of the rear wall or both side walls, and the bottom lid 6 covers the bottom opening of the upper case 4.
Is attached, a discharge port of the film unit is formed below the front wall 7.

[0004] Ribs 8 are integrally formed on both side walls of the upper case 4, respectively.
A notch 9 is formed at a location. The film pressure plate 5 is formed by press-molding a thin metal plate. A flat plate portion 11 is formed with a support piece 12 of the film unit on the front end side, a bent portion 13 on the rear end side, and bent pieces 14 bent vertically downward on both sides. ing. A pair of locking holes 12 are provided at the end of the support piece 12.
The letter a is used to lock the end of the film unit.

[0005] The bottom cover 6 is formed by press-forming a thin metal plate. Side plates 16 are formed on both sides of the bottom plate 15 by bending, and the upper edge of each side plate 16 is further bent inward. When the bottom lid 6 is slid from the back side of the upper case 4 and mounted, the ribs 8 formed on both side walls of the upper case 4 enter so as to be wrapped by the side plate portions 16 and are integrally connected.

Along each side of the bottom plate portion 15, two leaf spring pieces 18 are formed by bending. Leaf spring piece 18
When the film pressure plate 5 is housed in the upper case 4 and the bottom cover 6 is attached to the upper case 4, the lower edge of the bent piece 14 is pushed up to urge the film pressure plate 5 toward the exposure opening 3. A notch 19 is formed on the front edge side of the bottom plate 15, and the notch 1
The sponge sheet 20 is provided so as to protrude into the inside 9.

[0007] The sponge sheet 20 is formed by bonding a urethane sponge to the upper surface of a paper material as a support.
As will be described in detail later, when the film unit is pulled out after exposure, it is used as a restricting means for restricting the image receiving sheet from moving until the photosensitive sheet is pulled out to a predetermined position.

A film pack is constructed by storing a film unit in the pack body 2. FIG.
As shown in FIG. 5, the film pack 21 is used by being loaded into a pack holder 24. The pack holder 24 is also called a camera back, and includes a holder main body 27 on which a roller assembly 26 including a pair of developing rollers 25 is mounted, and a front plate 30 rotatably mounted on the holder main body 27 by a shaft 28. . A rectangular opening 30a is formed in the front plate 30, and the pack holder 21 is used by being fixed so that the surface of the front plate 30 is in close contact with the rear surface of the camera. Note that reference numeral 3
0b denotes a ridge used when positioning the pack holder 24 on the back of the camera.

A pack holding frame 32 is provided on the inner surface side of the front plate 30, and the film pack 21 is attached to the pack holding frame 32.
Fit into. The film pack 2 is placed in the pack holding frame 32.
1, the back wall of the upper case 4 is pressed by a leaf spring 34 incorporated at one end of the pack holding frame 32, and the front wall 7 of the upper case 4 is pressed by the other end wall surface of the pack holding frame 32. I can take it. As a result, the film pack 21 is stably held in the pack holding frame 32. In the case of a pack holder integrated into the camera, the front plate 30 is omitted, the pack holding frame 32 is fixed to the camera body, and the holder body 27 is assembled to the camera body so as to be openable and closable. However, the film pack 21 can be loaded in exactly the same manner.

A leaf spring 35 is fixed to the inner wall of the holder body 27. When the film pack 21 is loaded into the pack holding frame 32, the front plate 30 is closed and stopped by the clip fitting 36, as shown in FIG.
The bottom cover 6 is pushed up to urge the entire film pack 21 upward. Thus, the upper surface of the pack body 2 is pressed against the upper surface of the inner wall of the pack holding frame 32, and the film pack 21 is positioned in the photographing optical axis direction.

A projection 37 is further provided on the inner wall of the holder body 27.
Are integrally formed. The projections 37 perform positioning when the roller assembly 26 is mounted on the holder main body 27, and also push up the sponge sheet 20 attached to the bottom plate 15 of the pack main body 2 as shown in FIG. . When the roller assembly 26 is positioned at a predetermined position on the holder main body 27, the pair of developing rollers 25 face a discharge port formed in the holder main body 27 in a slit shape. The outlet is normally closed as shown by a discharge door 38 which is lightly biased in the closing direction.

As is well known, in the peel apartment type film unit, a photosensitive sheet 40 and an image receiving sheet 41 are stored separately above and below the film pressure plate 5 in the pack body 2, and the exposure opening 3 blocks light when not in use. It is covered with a sheet 42. Although about 10 film units are stored in the pack body 2, only one unit is shown in FIG. 5 in addition to the light shielding sheet 42 in order to avoid complication of the drawing. Photosensitive sheet 40 and image receiving sheet 4
1 is connected to the drawer sheet 43 in series,
The photosensitive sheet 40 is located above the film pressure plate 5 toward the exposure opening 3, and is located below the film pressure plate 5 with the image receiving sheet 41 facing upward.

When the film pack 21 is loaded into the pack holder 24, one end of the light-shielding sheet 42 protrudes from a drawer opening 44 formed between the holder main body 27 and the front plate 30. The other end of the light-shielding sheet 42 is fixed to the film pressure plate 5 together with the film unit by a staple, and when one end protruding from the drawer port 44 is pinched and pulled out, the other end is cut or perforated at the place where the stapling is performed. And is taken out through the outlet 44 as a series of sheets. As a result, the first photosensitive sheet 40 appears at the exposure opening 3, and the photographing preparation is completed. A tab 4 having one end adhered to the drawer sheet 43 of the first film unit is provided on the leading end side of the light shielding sheet 42.
The other end of the tab 5 is lightly adhered, and when the light shielding sheet 42 is taken out, the other end of the tab 45 projects from the outlet 44.

At this time, the leaf spring piece 18 bent and formed on the bottom plate portion 15 of the pack body 2 abuts on the lower edge of the bent piece 14 of the film pressure plate 5, and the film pressure plate 5 is
8 is pushed upward. Therefore, the photosensitive sheet 40 moves upward together with the film pressure plate 5 and is pressed against the inner wall of the upper surface of the pack body 2, and the photosensitive sheet 40 to be photographed always comes to a fixed position in the pack body 2.

After the photographing is performed through the opening 30a of the pack holder 24 and the exposure opening 3 of the pack body 2, the tab 4
5 is pulled out, the drawer sheet 43 moves toward the developing roller 25, and the leading end thereof passes between the pair of developing rollers 25 to push out the discharge door 38 as shown by a two-dot chain line in FIG. Protruding from. When the drawer sheet 43 is pulled out to this point, the portion to which one end of the tab 45 is adhered is located almost immediately below the drawer opening 44, and the tab 4 is pulled by the pulling operation force applied to the tab 45.
5 is peeled off from the drawer sheet 43. When the first tab 45 is peeled off in this way, the tab of the next film unit comes out from the outlet 44.

Subsequently, when the drawer sheet 43 protruding from between the developing rollers 25 is picked up and pulled out, the photosensitive sheet 40 moves to the left in the figure and is inverted at the bent portion 13 of the film pressure plate 5, and then the exposure surface is lowered. And enters the lower side of the film pressure plate 5. At the same time, the pod 46 attached to the drawer sheet 43 is
And approaches the developing roller 25 side. Then, after the connecting sheet 47 connecting the image receiving sheet 41 to the drawer sheet 43 is fully extended and the exposure surface of the photosensitive sheet 40 has moved to a position facing the image receiving sheet 41, the photosensitive sheet 40 is exposed by the pulling operation force of the drawer sheet 43. The sheet 40 and the image receiving sheet 41 move toward the developing roller 25 while overlapping.

As described above, the pressing force of the sponge sheet 20 pressed against the image receiving sheet 41 and the pressing force of the sponge sheet 20 until the photosensitive sheet 40 moves to the position where the photosensitive sheet 40 overlaps the image receiving sheet 41 until the connection sheet 47 is fully extended. The image receiving sheet 41 is not moved by the frictional force. Therefore, the photosensitive sheet 40 and the image receiving sheet 41 always enter between the developing rollers 25 in a state of completely overlapping.

Immediately before the photosensitive sheet 40 and the image receiving sheet 41 enter between the developing rollers 25, the pod 46 is crushed by the developing rollers 25, and the developing solution sealed in the pod 46 is discharged with the continuation of the drawing operation. The image is spread between the image receiving sheet 41 and the image receiving sheet 41 with a uniform thickness. After the film unit is completely pulled out from between the developing rollers 25 and a predetermined developing and fixing time elapses, the image receiving sheet 41
A positive image appears on the image receiving sheet 4 from the film unit.
A printed photograph can be obtained by peeling off only one.

As described above, in the conventional pack body 2 in which the peel-apart type film unit is stored, the film pressure plate 5 is pressed toward the exposure opening 3 to position the photosensitive sheet at the exposure position. It is an important point that 6 is made of a thin metal plate and the leaf spring piece 18 is provided. The sponge sheet 20 fixed to the bottom cover 6 is also important so that when the drawer sheet 43 is manually pulled after photographing, the photosensitive sheet 40 and the image receiving sheet 41 are accurately overlapped and then enter the developing roller 25. Plays a role.

[0020]

From the above background, the materials constituting the film pack 2 include various kinds such as metal, plastic, paper, sponge. After the film unit has been used up, the pack body 2 will be disposed of as waste. However, since the pack body 2 contains different kinds of materials, it is necessary for the user to separate the materials for disposal. In addition, the work is not only troublesome, but also may damage the hand when disassembling the pack body 2.

In the manufacturing process of the film pack 21, the bottom cover 6 is finally slid from the rear wall side of the upper case 4, and is mounted. A part of the upper case 4 and a part of the light shielding sheet 42 made of paper may be cut off. If the powder is scattered into the pack body 2 when the scraped-off small pieces are scattered, it will cause troubles in photographing and developing solution development, and there is a possibility that pinhole-shaped unexposed portions and uneven development may occur. Further, since the metal part is in the form of a thin plate, there is a possibility that the user may hurt his hand at the edge of the metal part when taking out the film pack 21 from the packaging bag.

Also, a metal film pressure plate 5 and a bottom cover 6
As a result, the bottom cover 6 is deformed by an impact when dropped, and the light-shielding sheet 42 and the film unit are cut off from the stapled perforations. There was a fear. Further, when the film pack is dropped together with the packaging bag, a hole is formed in the packaging bag due to the corner of the metal part, thereby impairing the moisture-proof property of the packaging bag, and when stored as it is, the photographic properties of the film unit may deteriorate. .

In order to be able to discard the pack body 2 without separating it, the upper case 4, the film pressure plate 5, and the bottom cover 6 may be all made of the same material. In addition, it is extremely difficult to provide the function of the leaf spring piece 18, it is difficult to obtain the same function as the sponge sheet 20 using only the paper material, and paper powder is easily generated during the manufacturing process. . In addition, including upper case 4,
When the pack body 2 is entirely made of a metal material, the upper case 4 must be formed by bending a thin plate in consideration of manufacturing costs, and it is troublesome to ensure that light is blocked particularly at corners. In addition, there are significant disadvantages in terms of weight and manufacturing cost.

If not only the upper case 4 but also the film pressure plate 5 and the bottom cover 6 are made of plastic, the function of the conventional leaf spring piece 18 cannot be obtained only by the elastic force of the plastic itself. In particular, the urging force when the first film unit is pressed toward the exposure opening 3 is
The urging force when the last film unit is pressed toward the exposure opening 3 as the photographing progresses is greatly attenuated, causing a problem that the positioning of the photosensitive sheet in the photographing optical axis direction becomes insufficient and the focus becomes loose. come.

The present invention has been made in view of the above circumstances, and by devising the structure of the pack main body, it is possible to make most or all of the constituent materials of the pack main body plastic. An object of the present invention is to provide an instant film pack that can be discarded to release a user from sorting work for each material and that is advantageous in terms of weight and manufacturing cost.

[0026]

In order to achieve the above object, the present invention provides an instant film pack which is used by loading it into a pack holder (including a built-in camera) having a common basic structure. In this configuration, the functions required for the pack body are obtained by positively utilizing the mechanism of the pack holder.

For this reason, most of the pack body used in the film pack of the present invention, including the film pressure plate housed therein, is made of a plastic molded product. Heretofore, a metal stapler has been used to lock the end of the film unit to the film pressure plate 5, but if a plastic thread or needle is used instead, for example, Can be made plastic. In order to position the film pack in the photographing optical axis direction by pressing the film pack through the bottom surface of the pack body and pressing the upper surface having the exposure opening against a predetermined receiving surface on the pack holder in which the film pack is loaded. In the film pack of the present invention, the film pressure plate housed in the pack body is pushed up toward the upper surface of the case body by using the urging force of the spring. At the same time that the photosensitive sheet is pressed, the film pack is also pressed to a predetermined photographing position.

In order to urge the film pressure plate using a spring provided in the pack holder, an opening through which the spring enters is formed on the bottom surface of the case body, and the spring entered into the case body directly. The simplest method is to press the film pressure plate. In this case, the opening provided on the bottom surface of the case body functions as the urging force transmitting means of the spring. Also,
In a preferred embodiment of the present invention, the wing pieces are fixed or integrally formed so as to be elastically deformable on a plastic bottom cover constituting the bottom surface of the case body, and the wing pieces are pushed when the spring of the pack holder pushes up the wing pieces. The blade is configured to push up the film pressure plate, and the blades serve as urging force transmitting means for transmitting the urging force of the spring on the pack holder side to the film pressure plate. By using such an urging force transmitting means, the photosensitive sheet can be pressed to a predetermined exposure position in the pack main body without providing the urging means for pressing the film pressure plate in the pack main body itself.

A regulating means is further provided on the bottom surface of the case main body to prevent the photosensitive sheet and the image receiving sheet from being inadvertently moved by coming into contact with the back surface of the image receiving sheet when the exposed film unit is pulled out. It acts so that it is correctly overlapped and pulled out from the outlet of the pack body. This restricting means is also preferably a tongue-shaped restricting piece integrally formed with a plastic bottom lid constituting the bottom surface of the case body, and its surface is provided with irregularities in order to increase friction with the image receiving sheet. It is good to provide.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a pack body 50 to which the present invention is applied comprises an upper case 52 constituting the upper surface of a box-shaped case body having a substantially rectangular parallelepiped shape, and a bottom surface of the case body. And a film pressure plate 53 housed between them, all of which are made by injection molding of plastic. Various plastic materials that can be injection-molded, such as polystyrene, ABS, PPE (polyphenyl ether), polycarbonate, and polypropylene, can be used. In addition, these plastic materials are 1% by weight for the purpose of imparting light-shielding properties.
The front and rear light shielding substances, for example, carbon black are mixed.

It is also advantageous to use a biodegradable plastic for the purpose of further improving the suitability of the pack body 50 for disposal. As biodegradable plastics, there are synthetic products, products produced by fermentation, and products mainly composed of natural products. For example, fatty acid polyesters represented by polylactic acid, polyesters produced by microorganisms, and
VA (polyvinyl alcohol).

In the upper case 52, the lower edge of the front wall 7 is higher than the lower edges of the rear wall and both side walls as in the conventional case.
An outlet for the film unit is formed between the film unit and the bottom cover 54. Ribs 8 are integrally formed on both side walls of the upper case 52, and cutouts 55 are formed below the ribs 8 on both side walls. 3 and 5 in FIGS.
Components that are functionally common to those already described based on the above are denoted by the same reference numerals.

The film pressure plate 53 is made of an injection molded product of the same plastic material as the upper case 52. A locking hole 12a is formed at an end of the support piece 12 integrally connected to the front end side of the flat plate portion 11, and is used for stapling the end of the film unit as in the conventional one. A semi-cylindrical portion 56 is provided on the rear end side of the flat plate portion 11,
When the film unit is pulled out, the photosensitive sheet is turned over.

Side plates 58 bent vertically downward are integrally formed on both side surfaces of the flat plate portion 11. Even when the film pressure plate 53 is accommodated in the upper case 52 and moved to the uppermost position in the upper case 52, the lower edge of the side plate 58 is located within the height range of the notch 55 when viewed from the side. That is, irrespective of the vertical position of the film pressure plate 58 in the upper case 52, the height of the notch 55 and the side plate 58 are adjusted so that the upper edge of the notch 55 does not fall below the lower edge of the side plate 58. Height dimension is determined.

The bottom cover 54 is also made by injection molding the same plastic material as the upper case 52. Side plate portions 61 having a U-shaped cross section are integrally formed on both sides of the bottom plate portion 60, and the bottom lid 54 is attached to the upper case 52 similarly to the conventional product.
When it is slid from the back side of the
The ribs 8 formed on both side walls of the first and second side walls enter so as to be wrapped by the side plate portions 61, and both are integrally connected.

The bottom plate portion 60 is integrally provided with a pair of wings 62 serving as urging force transmitting means for transmitting the urging force of the leaf spring 35 of the pack holder 24 to the film pressure plate 53. The wing pieces 62 are formed by forming a “U” -shaped cut 63 in the bottom plate portion 60 and then performing hot press molding, and each tip is directed toward the side plate portion 61 and directed upward. ing. By devising the structure of the mold, it is possible to integrally mold the wing piece 62 when the bottom cover 54 is injection-molded. Further, a notch 19 is formed on the front edge side of the bottom plate portion 60, and this notch 19
A regulating plate 65 is integrally formed so as to protrude inward.
The restricting plate 65 functions as a restricting means for restricting the movement by slidingly contacting the back surface of the image receiving sheet 41 when the film unit is pulled out. A plurality of projections 66 are provided integrally on the upper surface of the regulating plate 65, whereby irregularities are formed on the upper surface of the regulating plate 65.

The light-shielding sheet and the film unit are attached to the film pressure plate 53 and housed in the upper case 52, and the bottom cover 5
The film pack is obtained by sliding the front edge side of 4 from the back side of the upper case 52 and attaching the bottom cover 54 to the upper case 52. When assembled as a film pack, the tip of the wing piece 62 formed integrally with the bottom lid 54 enters the notch 55 formed on the side wall of the upper case 52,
The film pressure plate 53 comes into contact with the lower edge of the side plate 58 of the film pressure plate 53 and pushes up the film pressure plate 53 toward the upper case 52 by its own elastic force. As a result, the light-shielding sheet 42 on the uppermost layer is pressed against the inner surface of the upper wall of the upper case 52, so that the exposure opening 3 is shielded.

This film pack is used by being loaded into a pack holder 24 shown in FIG. 4, just like a conventional film pack. FIG. 2 is a sectional view of a main part of the film pack 70 according to the present invention in use. When the film pack 70 is loaded into the pack holder 24, the leaf spring 35 of the holder main body 27 pushes up the wing piece 62 formed on the bottom cover 54 of the pack main body 50. Since the wing pieces 62 are in contact with the lower edge of the side plate portion 61 of the film pressure plate 53, the film pack 70 is pushed upward by the urging force of the leaf spring 35, and the upper case 52 is pressed.
Is in contact with the inner wall of the front plate of the pack holder 24, and the film pack 70 is positioned in the photographing optical axis direction.

The protrusion 37 formed on the inner wall of the holder main body 27 pushes up a restricting piece 65 formed on the bottom cover 54 of the pack main body 70, and a discharge port formed below the front wall 7 of the upper case 52. The light shielding sheet 42 protruding from is lifted. When the user pulls out the light-shielding sheet 42 from the drawer opening 44 of the pack holder 24 while holding the tip of the light-shielding sheet 42, the light-shielding sheet 42 is pulled out from the film pack 70. When the light-shielding sheet 42 is pulled out, the film pressure plate 53 is raised by the thickness of the light-shielding sheet 42 due to the urging force of the leaf spring 35. Therefore, the photosensitive sheet 42 of the first film unit is pressed against the inner wall of the upper surface of the upper case 52, and photographing is performed. Preparation is completed.

Thereafter, after the photographing operation is performed in the same manner as before, the tab 45 is pulled out, and further, the drawer sheet 43 is pulled out through the developing roller 25. Thereby, the photosensitive sheet 40 moves to the left in the figure,
The film enters the lower side of the film pressure plate 53 while being inverted at the semi-cylindrical portion 56 of the film pressure plate 53. At the same time, the pod 46 attached to the drawer sheet 43 approaches the developing roller 25 side over the image receiving sheet 41. Then, as in the conventional case, the connection sheet 47 is fully extended and the photosensitive sheet 4
After the exposure surface 0 moves to a position facing the image receiving sheet 41, the photosensitive sheet 40 and the image receiving sheet 41 move toward the developing roller 25 while being overlapped by the pulling operation force of the drawer sheet 43.

Until the photosensitive sheet 40 moves to the position where it overlaps the image receiving sheet 41, the image receiving sheet 41
Since the upper surface of the regulating piece 65 having the projections 66 is pressed against the back surface of the image receiving sheet 41, the image receiving sheet 41 does not move as before. Therefore, the photosensitive sheet 40 and the image receiving sheet 41 always enter between the developing rollers 25 in a state of being completely overlapped.

When the drawer sheet 43 is further pulled out, the pod 46 is moved to the developing roller 2 just before the photosensitive sheet 40 and the image receiving sheet 41 enter between the developing rollers 25.
5, the developing solution enclosed therein is developed with a uniform thickness between the photosensitive sheet 40 and the image receiving sheet 41 as the drawing operation is continued. After completely pulling out the film unit from between the developing rollers 25,
After a predetermined development and fixing time, a positive image appears on the image receiving sheet 41, and a print photograph is obtained by peeling off only the image receiving sheet 41 from the film unit.

When the first film unit is pulled out, the film pressure plate 53 is pushed up via the wings 62 by the urging force of the leaf spring 35 of the holder main body 27, so that the second photosensitive sheet 40 is moved to the upper case 52. Is pressed against the inner wall of the upper surface of the camera, and preparation for the next shooting is completed. Wing piece 6
The second film unit 2 receives the upward biasing force of the leaf spring 35 even at the highest position and is not blocked by the notch 55 formed on the side wall of the upper case 52. Also, the photosensitive sheet 40 can be pressed against the inner wall of the upper surface of the upper case 52.

As described above, the wing piece 6 provided on the bottom lid 54
2 is pressed by the leaf spring 35 of the holder body 27, the biasing force is more stable than when the film pressure plate 53 is pressed only by the elastic force of the plastic itself forming the bottom plate portion 60 and the wing piece 62. Can be obtained, and the photosensitive sheet 40 can be always kept at a fixed position. Since the elastic force of the wing piece 62 itself also has the function of pushing up the film pressure plate 53, the film pack 7
0 is handled alone, the film pressure plate 53
The film unit does not rattle inside the pack body 50.

FIG. 6 shows another embodiment of the present invention. As in the previous embodiment, the upper case 8 constituting the pack body 80
2, the film pressure plate 53 and the bottom cover 84 are formed of plastic molded products. In the pack body 80, the bottom cover 8
4 itself is attached to the upper case 82 so as to be able to move toward the exposure opening 3 of the upper case 82. For this reason, both side walls of the upper case 82 are only up to the ribs 8, and the thickness of the ribs 8 is also smaller than the bending height of the side plate portion 61 of the bottom lid 84. Therefore, the rib 8 is connected to the side plate portion 61.
When the upper case 82 and the bottom cover 84 are connected to each other and the bottom case 84 is connected, the bottom cover 84 is vertically movable with respect to the upper case 82.

The height H2 of the side plate 58 of the film pressure plate 53 is larger than the inner height H1 of the upper case 82, and the lower edge of the side plate 58 of the film pressure plate 53 is connected to the bottom plate portion 60 of the bottom cover 84.
Supported by And, like the previous embodiment,
The photosensitive sheet 40 of the film unit is held between the flat plate portion 11 and the inner surface of the upper wall of the upper case 82, and the image receiving sheet 41 is accommodated between the lower surface of the flat plate portion 11 and the bottom cover 84. Since the other structures of the pack body 80 are the same as those shown in FIG. 1, they are denoted by the same reference numerals and description thereof will be omitted.

When the film pack is loaded into the pack holder 24, the leaf spring 35 of the holder body 27 pushes up the bottom cover 84 of the pack body 80. Since the side plate 58 of the film pressure plate 53 is supported by the bottom plate portion 60 of the bottom cover 84, when the bottom cover 84 is lifted, the film pressure plate 53 is also pushed up. Since the upper surface of the upper case 82 is positioned in contact with the inner wall of the front plate of the pack holder 24, the film pressure plate 53
Is pushed up, the uppermost layer of the photosensitive sheet 40 held thereon is pressed against the inner wall of the upper surface of the upper case 82, and the preparation for photographing is completed.

The film unit is reduced by performing the drawing operation after photographing, but the leaf spring 35 of the holder main body 27 pushes the film pressure plate 53 together with the bottom cover 84 toward the exposure opening 3, so that the uppermost photosensitive sheet 4 is formed.
2 is always positioned at a fixed photographing position pressed against the inner wall of the upper surface of the upper case 82. Since the height H2 of the side plate 58 of the film pressure plate 53 is larger than the inner height H1 of the upper case 82, the urging force of the leaf spring 35 can be maintained even when one last film unit remains. The film is transmitted to the film pressure plate 53 via the bottom cover 84, so that the positioning of the film unit does not change. The pack body 80 has a structure in which the film pressure plate 53 is pushed up by the movement of the bottom cover 84 itself.
There is no need to make a cut or the like at 0, which is advantageous in increasing the strength of the bottom lid 84.

As described above, the present invention has been described based on the illustrated embodiments. However, appropriate changes can be made in practicing the present invention. For example, a plastic wing piece 62 or a regulating piece 65 prepared separately may be used by being fitted to the bottom plate portion 60 or fixed by ultrasonic welding or the like, or these shapes may be arbitrarily changed. Also, the image receiving sheet 4
A protrusion 66 is provided on the upper surface of the regulating piece 65 to increase the friction with
However, fine irregularities may be formed on the upper surface of the regulating piece 65 instead of the protrusion 66. The present invention is particularly effective in that the film pressure plate 53 and the bottom lids 54 and 84 can be made of plastic. For example, a conventional sponge sheet may be bonded to the bottom lids 54 and 84 instead of the regulating piece 65 and used. It is possible.

Further, in the embodiment shown in the figure, a substantially rectangular parallelepiped case body is formed by combining two parts, an upper case 52 and a bottom lid 54, which are injection-molded as separate parts. And the upper case part and the bottom lid part are bent at the hinge part, and the free ends of both parts are locked with nails to form a similar shape. A case body can be obtained.
In this case, the film pressure plate 53 may be inserted between the two together with the film unit before the nailing.

[0051]

As described above, according to the instant film pack of the present invention, all of the main parts such as the upper case, the film pressure plate, the bottom cover and the like constituting the pack body can be constituted by plastic molded products. In the disposal process after use, it can be discarded collectively without decomposing, and the weight of each can be reduced. In addition, the unique function required of the pack body uses a leaf spring of the pack holder, which is inevitably used when using this instant film pack. The manufacturing cost can be reduced in combination with the use of all plastics.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a pack body used in the present invention.

FIG. 2 is a sectional view of a main part showing a state when the film pack of the present invention is loaded in a pack holder.

FIG. 3 is an exploded perspective view of a conventional pack body.

FIG. 4 is a perspective view of the film pack and the pack holder shown in FIG.

FIG. 5 is a cross-sectional view of a main part showing a state when the film pack shown in FIG. 3 is loaded in a pack holder.

FIG. 6 is an exploded perspective view showing another embodiment of the present invention.

[Explanation of symbols]

 3 Exposure opening 50, 80 Pack body 53 Film pressure plate 54, 84 Bottom lid 55 Notch 62 Wing piece 65 Restriction piece 66 Projection

Claims (6)

[Claims] 1. An exposure opening is formed on the upper surface of a box-shaped case main body having a substantially rectangular parallelepiped shape, and a discharge opening of a film unit is formed on a front surface connected to the upper surface, and between the bottom surface and the upper surface of the case main body. A photosensitive sheet connected to a drawer sheet facing the exposure opening is stored on the upper surface side of the film pressure plate, and a connection sheet is provided on the bottom surface side of the film pressure plate. The image receiving sheet is connected to the drawer sheet via the drawer sheet, and the tip of the drawer sheet protruding from the discharge port is pulled out, so that the photosensitive sheet and the image receiving sheet overlap and the peel apartment is drawn out from the discharge port. An instant film pack having a built-in type instant film unit,
An instant film pack used by being loaded into a pack holder having a spring for pressing the upper surface of an upper case against a predetermined receiving surface by pressing the bottom surface of the case body, wherein the case body and the film pressure plate are each formed of a plastic molded product. And an urging force transmitting means for pushing the film pressure plate toward the upper surface of the case main body by the urging force of the spring on the bottom surface of the case main body, and an image receiving sheet which contacts the back surface of the image receiving sheet below the discharge port. And a regulating means for regulating the movement of the instant film. 2. An upper case having an exposure opening formed on an upper surface thereof, an upper case having an open bottom, and an upper case being attached to the upper case so as to cover the bottom of the upper case and form a discharge opening of a film unit on the front surface of the upper case. A photosensitive sheet connected to a drawer sheet having a bottom cover, a pack body including a film pressure plate housed between the upper case and the bottom cover, and being connected to the exposure opening on the upper surface side of the film pressure plate. An image-receiving sheet connected to the drawer sheet via a connection sheet is arranged on the bottom side of the film pressure plate, and the photosensitive sheet and the photosensitive sheet are pulled out by pulling out the leading end of the drawer sheet protruding from the discharge port. An instant film containing a peel apartment type instant film unit which is drawn out of the outlet by overlapping with an image receiving sheet. An instant film pack which is used by being loaded into a pack holder provided with a leaf spring for pressing an upper surface of an upper case against a predetermined receiving surface by pressing the bottom cover, wherein the upper case, the bottom cover, and a film are used. Each of the pressure plates is formed of a plastic molded product, and the bottom cover has plastic wings that push up the film pressure plate toward the upper surface of the upper case by pressing the plate spring provided on the pack holder; An instant film pack, wherein a plastic restricting piece for restricting the movement of the image receiving sheet by contacting the back surface of the image receiving sheet below the exit is fixed. 3. The instant film pack according to claim 2, wherein the wing pieces are formed integrally with the bottom lid. 4. An upper case having an exposure opening formed on an upper surface and an open bottom, and an upper case is attached to the upper case so as to cover a bottom of the upper case and form a discharge opening of a film unit on a front surface of the upper case. A photosensitive sheet connected to a drawer sheet having a bottom cover, a pack body including a film pressure plate housed between the upper case and the bottom cover, and being connected to the exposure opening on the upper surface side of the film pressure plate. An image-receiving sheet connected to the drawer sheet via a connection sheet is arranged on the bottom side of the film pressure plate, and the photosensitive sheet and the photosensitive sheet are pulled out by pulling out the leading end of the drawer sheet protruding from the discharge port. An instant film containing a peel apartment type instant film unit which is drawn out of the outlet by overlapping with an image receiving sheet. An instant film pack which is used by being loaded into a pack holder provided with a leaf spring for pressing an upper surface of an upper case against a predetermined receiving surface by pressing the bottom cover, wherein the upper case, the bottom cover, and a film are used. Each of the pressure plates is formed of a plastic molded product, and the bottom cover is coupled to the upper case so as to move toward the exposure opening together with the film pressure plate by the bias of the leaf spring, and the bottom cover has a portion below the discharge port. An instant film pack, wherein a regulating piece for regulating the movement of the image receiving sheet by contacting the back surface of the image receiving sheet is provided. 5. The instant film pack according to claim 3, wherein the restricting piece is formed integrally with the bottom cover. 6. The instant film pack according to claim 3, wherein irregularities are formed on the surface of the regulating piece that contacts the back surface of the image receiving sheet.