JP2002207276A - Instant film pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely and surely take out a light shielding sheet and to improve disposability of an instant film pack after use. SOLUTION: The instant film pack 10 consists of a light shieldable pack body 12 and the light shielding sheet 14. The pack body 12 consists of a box-like portion 15 having flexibility and a collar portion 18 formed around an opening 12a and 10 sheets of instant films are laminated and housed in the box-like portion 15. The light shielding sheet 14 consists of a cap portion 14a which seals the collar portion 18 and phototightly closes the opening 12a and a tongue portion 14b which is returned from the boundary with the cap portion 14a and is projected on its front end side to the outside of the pack body 12. When a camera is loaded with the instant film pack 10 by engaging a hole 20 formed in the central part of a broad portion 18a with the projection on the camera side and the tongue portion 14b is pulled, the sealing portion 24 peels and the opening 12a is opened. The pack body 12 collapses and is taken out of the camera after the completion of photographing.

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 for storing a mono-sheet type instant film.

[0002]

2. Description of the Related Art A mono-sheet type instant film comprises an exposure section, a developer pod, and a trap section, and can be handled as one sheet until the end. The exposure unit includes a transparent cover sheet, a photosensitive layer serving as an exposure surface, a white diffuse reflection layer, and an image receiving layer serving as a back surface. The developer pod is provided on the discharge direction side with respect to the exposure unit, and contains a developing solution. When the developer pod is split by the developing roller and the developing solution is developed between the photosensitive layer and the cover sheet, the latent image recorded on the photosensitive layer is transferred to the image receiving layer as a positive image through the diffuse reflection layer. You. The image transferred to the image receiving layer is observed as a positive image from the surface opposite to the cover sheet. The trap unit is provided on the opposite side of the discharge direction with respect to the exposure unit,
The remaining developing solution developed between the photosensitive layer and the cover sheet from the developing solution pod is captured and cured.

[0003] Such an instant film is usually 1
Approximately 0 sheets are stacked and sold in a plastic box-shaped hard case called an instant film pack. This instant film pack can be used as it is loaded in the camera as it is, and the used pack is discarded as it is.

In recent years, from the viewpoint of waste reduction and environmental protection,
In order to reduce the amount of material used in the instant film pack that is only discarded as described above, an instant film pack that uses a strip-shaped light-shielding sheet instead of this box-shaped case and light-tightly packs the laminated instant film is used. Are disclosed in JP-A-10-221814 and JP-A-1
It is known from, for example, Japanese Patent Application Laid-Open No. 0-228080. In the case of using the light-shielding sheet, after the instant film pack is loaded into the camera, the instant film pack is removed before photographing.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the instant film pack described in Japanese Patent No. 1814, since the light-shielding sheet is directly wound around the laminated instant film, the instant film can be removed by removing the portion where the light-shielding sheet is sealed with an adhesive and opening the film. In some cases, the light-shielding sheet is pulled and bent, whereby the light-shielding sheet is caught on the edge portion of the film, making it difficult to remove the light-shielding sheet.

In the instant film pack described in Japanese Patent Application Laid-Open No. 10-228080, a gas or a plate member is put in the pack. In the case where gas is sealed, the size of the pack increases, which is disadvantageous in reducing the size of the camera on which the pack is loaded. In the case where a plate member is inserted, when removing the light-shielding sheet, the light-shielding sheet is caught at the edge of the plate member, and in the worst case, the light-shielding sheet is broken and a piece of sheet remaining in the camera is reflected in shooting. was there.

The present invention has been made in view of the above background, and has as its object to provide an instant film pack that can safely and reliably take out a light-shielding sheet and is excellent in disposal suitability after use. .

[0008]

In order to achieve the above object, an instant film pack according to the present invention is an instant film pack in which a plurality of mono-sheet type instant films are stacked and stored in a light-tight manner. A flexible box-shaped portion formed of a resin sheet and having a substantially rectangular opening through which the instant film can be stacked and housed and through which the instant film can enter and exit in the thickness direction, and an opening connected to an edge of the opening. A pack body composed of a frame-shaped flange provided around the portion, a substantially rectangular lid sealed by the flange and closing the opening in a light-tight manner, and extending one end thereof in the longitudinal direction. And a light-shielding sheet comprising an elongated tongue piece provided in a predetermined direction. By pulling the tongue piece in a predetermined direction, the gap between the flange and the lid is formed. Le is what the opening is opened peeling.

The tongue piece is folded back from a boundary with the lid sealed to the pack body, passes over the lid, and projects out of the contour of the pack body. By pulling the cut portion away from the pack body, the seal between the flange and the lid is peeled off, and the opening is opened. In addition, at least the lid and the flange near the folded boundary of the tongue are sealed in a mountain-shaped pattern with the crest facing the tip of the tongue. Also, a part of the flange is engaged with an engagement means provided in a pack loading chamber on the camera side in which the pack body is loaded, and the pack body is deformed following the pulling of the light shielding sheet. This is provided with an engaged means for preventing this. Further, a groove serving as a fold is formed on the outer surface of the bottom of the box-shaped portion.

[0010]

FIG. 1 shows a first embodiment of the present invention.
2 and FIG.
Is a plurality of, for example, ten instant films 11
Body 12 formed with a box-like portion for stacking and storing
And a light-shielding sheet 14 that closes the opening 12a of the pack body 12 in a light-tight manner. The opening 12a is formed in a rectangular shape slightly larger than the instant film 11 so that the rectangular instant film 11 can be put in and taken out in the thickness direction.

As is well known, the instant film 11 includes a photosensitive sheet on which a latent image is formed photochemically by exposure and an image receiving sheet on which a positive image is transferred from the latent image via a developing solution. An exposure unit 4, a developer pod 5 containing a developing solution, and a trap unit 6 for capturing and curing excess developing solution are unitized, and can be handled as one sheet until the end. It is a rectangular mono-sheet type.

The pack body 12 is made of black oriented polypropylene (OPP) to which 1% by weight of carbon black (Mitsubishi Chemical's 950) is added, and has a thickness of 0.6 mm.
The light-shielding resin sheet is formed into a box shape having a thickness D1 of each part of 0.3 mm by vacuum forming, and has flexibility. A groove 16 serving as a fold is formed on the bottom surface of the box-shaped portion 15, and the thickness D2 of the box-shaped portion 15 in which the groove 16 is formed is formed to be 0.2 mm (see FIG. 3). ).

A flange 18 is integrally formed with the pack body 12 so as to be connected to an edge of the opening 12a. The flange 18 is formed such that a portion along the long side edge of the opening 12a is narrow, and a portion along the short side edge of the opening 12a is wide. Hereinafter, wide portions of the flange portion 18 are referred to as wide portions 18a and 18b, and narrow portions are referred to as narrow portions 18a and 18b.
c, 18d.

A hole 20 is formed at the center of the wide portion 18a. The holes 20 engage the projections on the camera when the instant film pack 10 is loaded in the instant camera, thereby preventing the pack main body 12 from being easily deformed when the light shielding sheet 14 is pulled out from the camera main body. The hole 20 also functions as the positioning of the pack body 12 and contributes to preventing erroneous loading.

The light-shielding sheet 14 is formed by coating a 30 μm-thick black polyethylene resin light-shielding resin film with 10 μm of a heat-welding adhesive, as shown in FIG.
8 has a substantially rectangular lid 14 that covers almost the entirety of
a and an elongated tongue piece 14b.

After the lid 14a is overlaid so as to substantially cover the flange 18, the edge of the lid 14a is pressed against the flange 18 and heated from above the lid 14a in an arrow-shaped pattern. Thereby, the edge of the lid 14a is sealed to the flange 18 by the heat-welding adhesive of the lid 14a (the seal 24). Thereby, the opening 12 is formed by the lid 14a.
a is closed light-tight. The tongue piece 14b is folded back from the boundary line 22 with the lid 14a so as to be overlapped on the lid 14a.

As described above, the lid 14a and the flange 18 are sealed with an arrow-shaped pattern. This will be described in more detail below. As shown in FIGS. 1 and 4, seal portions 24 a and 24 b in which wide portions 18 a and 18 b of flange portion 18 and lid portion 14 a are sealed, and narrow portion 18
c, 18d and the lid portion 14a are sealed with a seal portion 24
The pattern of the seal differs between c and 24d. In the narrow portions 18c and 18d, the pattern of the seal portions 24c and 24d is linear since the pattern is along the peeling direction. However, in the wide portions 18a and 18b, the pattern is orthogonal to the peeling direction.
Each of the tops of the seal portions 24a and 24b is formed in a mountain shape whose tip is directed toward the tip end of the tongue piece 14b so as to be easily peeled off. In the vicinity of the seal portion 24a, a seal portion 25 having a donut-shaped pattern for shielding the periphery of the hole 20 from light is provided.
Is provided.

In order to use the instant film pack 10 constructed as described above, the instant film pack 10 is loaded into the pack loading chamber 31 of the instant camera 30, as shown in FIG. At the time of this loading, the lid 32 of the pack loading chamber 31 is
After pivoting about the opening 3, the box-shaped portion 15 of the pack body 12 is dropped inside the lid 32 while inserting the hole 20 into the projection 35 formed on the upper wall of the lid 32. As a result, the instant film pack 10 is
2 is positioned at a predetermined position.

When the lid 32 is closed, the lid 32 is locked so as not to be opened carelessly, and the instant film pack 10 is held by a pair of pressing members 38 attached to the inner wall surface at the bottom of the lid 32. 15 is pushed up to the aperture 41 side, and the flange portion 18 comes into contact with the support portions 42 and 43 in the pack loading chamber 31, and the pack loading chamber 3
1 at a predetermined position. The pressing member 38 is
It comprises a protruding block 39 elongated in a direction perpendicular to the drawing, a leaf spring (not shown), and a holding member 40 for holding these. Further, a photographing lens 36 is provided behind the aperture 41.

Immediately after the lid 32 is closed, the light shielding sheet 14 is closed.
Of the tongue piece 14b protrudes out of the instant camera 30 by being sandwiched between the sponge-like light shielding member 44 attached to the support part 43 and the edge of the lid 32. When the tongue piece 14b is gripped and pulled, the wide portion 18a of the flange 18
, The pack body 12 is not deformed following the pulling of the tongue piece portion 14b, the seal portion 24a of the mountain-shaped pattern is first peeled off, and then the seal portions 24c and 24d of the linear pattern are drawn. Is peeled off, and finally the seal portion 24b of the mountain-shaped pattern is peeled off, and the opening 12
a is released, and the light shielding sheet 14 is discharged out of the instant camera 30. When the light-shielding sheet 14 is pulled out, the pack body 12 is hardly deformed, so that the operation of pulling out the light-shielding sheet 14 can be surely performed with minimum force, and there is no possibility that the internal instant film 11 is damaged.

The light-shielding sheet 14 drawn out of the instant camera 30 is discarded as garbage. However, since the light-shielding sheet 14 is a small amount of thin resin film, the adverse effect on the environment is extremely small. Immediately after the light shielding sheet 14 is pulled out, the gap between the camera body 30a and the lid 32 is shielded by the light shielding member 44.

When the light-shielding sheet 14 that has prevented the instant film 11 from moving toward the aperture 41 is removed and the opening 12a is opened, the pressing force of the pressing member 38 causes the box-shaped portion 15 to make the groove 16 fold. Deformed,
The internal instant film 11 moves to the aperture 41 side. As a result, as shown in FIG. 6, the uppermost instant film 11 is brought into contact with the aperture 41, and the photographing preparation is completed.

When the photographing lens 36 is pointed at the subject and the shutter button is pressed, the shutter opens and closes, and the subject light incident from the photographing lens 36 is transmitted to the aperture 41.
To form an image on the exposure unit 4 of the instant film 11. Immediately after this, the well-known scraping claw 47 sends out the exposed instant film 11 toward the developing roller 48.

When the end of the instant film 11 on the developer pod 5 side reaches the developing roller 48, the developing roller 4
8 adds the instant film 11
The instant film 11 is transported by the developing roller 48. Immediately after this, raked claw 47
Returns to the original standby position.

The instant film 11 is used as the developing roller 4
Immediately after being put into the developing roller 8, the developer pod 5 is split by the developing roller 48. In front of the developing roller 48, a developing control plate 49 is provided, which squeezes the instant film 11 and uniformly spreads the developing solution flowing out of the developing solution pod 5 into the instant film 11.

The instant film 11 is discharged to the outside of the camera body 30a through the discharge passage 51 while the developing solution is developed by the developing roller 48 and the developing control plate 49. After a lapse of a predetermined time, a positive image of the photographed subject appears on the surface of the exposure unit 4 of the instant film 11 (the surface opposite to the cover sheet).

When the uppermost instant film 11 is discharged, the next instant film 11 is set on the aperture 41 by the pressing of the pressing member 38. In the same manner, exposure and discharge of the instant film 11 are repeated one by one. After the exposure and discharge of all the instant films 11 are completed, the lid 32 is unlocked and the lid 32 is opened. Then, the pack body 12 remaining inside the lid 32 is taken out and discarded. At this time, the pack body 12
Since is almost crushed by the pressing of the pressing member 38, it is not bulky and is excellent in disposal.

Next, in FIG. 7 showing a second embodiment of the present invention, the instant film pack 55
7, a rectangular reinforcing member 60 is fixed to the bottom 57a by an ultrasonic seal. The mounting position of the reinforcing member 60 is determined by the box-shaped portion 5.
7 is a position where the developer pod 5 of the instant film 11 faces. As a result, even when a strong pressure is applied to the portion where the developer pod 5 is stored, the pressure is not transmitted to the developer pod 5 and the developer pod 5 does not tear.

As the reinforcing member 60, for example, a polypropylene film of 0.5 mm is used and fixed to the bottom portion 57a by an ultrasonic seal. May be attached to the bottom portion 57a. In addition, the thickness of the portion facing the developer pod 5 when the pack body is formed may be increased to enhance the rigidity of the portion.

In the embodiment described above, oriented polypropylene is used as a material for molding the pack body.
In addition, polystyrene, polyethylene, polypropylene and the like are preferable, and general materials such as polycarbonate and polyester can be used. Further, it may be a paper material that can be drawn. In addition, the pack body is formed by vacuum molding, but may be formed by thin injection molding. Due to recent advances in injection molding technology, the amount of waste generated during production has been extremely reduced, which is advantageous in terms of resource conservation, waste reduction, and environmental protection. In order to form a thickness of, for example, 0.3 mm by injection molding, an ultra-high-speed filling injection molding machine is used. As such an ultra-high-speed filling injection molding machine, there are, for example, UH1000 series manufactured by Nissei Plastics Industries, SGM-HP series manufactured by Sumitomo Heavy Industries, and the like.

In the above-described embodiment, the pack body is deformed substantially regularly with the groove formed in the bottom of the box-shaped portion as a fold, but the overall thickness of the pack body is reduced to, for example, about 0.2 mm. Alternatively, the pressing member may be easily crushed, and the pressing force of the pressing member may be directly transmitted to the instant film in the pack body. Further, although the thickness of the bottom of the box-shaped portion is constant, the substantially central portion of the bottom corresponding to the exposed portion of the instant film may be formed thicker than other portions. This can contribute to ensuring the flatness of the exposed portion of the instant film.

Further, in the above embodiment, a hole is provided in the collar portion of the pack body as an engaged means, and a projection is provided in the pack loading chamber as an engaging means for engaging with the hole. However, the present invention is not limited to this. Instead, for example, a protrusion may be provided on the flange of the pack body, and a hole for engaging with the protrusion may be provided in the pack loading chamber. In addition, although one set of holes and projections is provided, the invention is not limited to this.
Two or more sets may be provided.

[0033]

As described above, the instant film pack according to the present invention comprises a pack body comprising a box-shaped portion for laminating and storing the instant film and a flange integrally formed around the opening. Since the light-shielding sheet is sealed to the flange and the opening is closed light-tightly, there is no danger of the light-shielding sheet being hooked on the instant film and being bent when pulling the light-shielding sheet and peeling it off the flange. In addition, the light-shielding sheet can be safely and reliably taken out. Further, since the waste is only the pack body and the light shielding sheet made of the resin sheet, it is excellent in the suitability for disposal after use.

The tongue piece is folded back from the boundary with the lid sealed to the pack body, passes over the lid, and projects out of the contour of the pack body. By pulling the cut portion away from the pack body, the seal between the flange and the lid can be easily peeled off with relatively little force, and the opening of the pack body can be reliably opened. Also, at least the lid and the flange near the folded boundary of the tongue are sealed in a mountain-shaped pattern with the crest facing the tip of the tongue, so that the tongue is folded back. By pulling in the direction, the seal between the flange portion and the lid portion can be peeled off with a smaller pulling force.

Further, since a part of the flange portion is engaged with the pack loading chamber, the pack body can be prevented from being deformed following the pulling of the light shielding sheet, so that the instant film can be prevented from being damaged. It can contribute to the safe and reliable removal of the light shielding sheet. In addition, since a groove serving as a fold is formed on the outer surface of the bottom of the box-shaped portion, when the bottom of the box-shaped portion is pressed by the pressing member on the camera side, the deformation of the box-shaped portion is performed regularly, and the inside of the box-shaped portion is formed. The instant film can be correctly pressed toward a predetermined exposure position.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing the instant film pack from the bottom side of a box-shaped portion.

FIG. 3 is a cross-sectional view of a groove serving as a fold formed at the bottom of the box-shaped portion.

FIG. 4 is a development view of a light shielding sheet.

FIG. 5 is an end view of the instant camera showing a state immediately after the instant film pack is loaded.

FIG. 6 is an end view of the instant camera showing a state after a light-shielding sheet is pulled out.

FIG. 7 is a perspective view showing the instant film pack of the second embodiment from the bottom side.

[Explanation of symbols]

 10,55 Instant film pack 11 Instant film 12 Pack body 14 Light shielding sheet 14a Lid 14b Tongue piece 15 Box-shaped part 16 Groove 18 Flange part 20 Hole 24 Seal part 31 Pack loading chamber 35 Projection

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) B65D 81/30 B65D 81/30 C F-term (Reference) 3E067 AA12 AB39 AC03 AC11 AC14 BA02A BB14A BC02A CA12 EA04 EA32 EB11 EB27 EE59 FA01 FC01

Claims (5)

[Claims] 1. An instant film pack in which a plurality of mono-sheet type instant films are stacked and stored in a light-tight manner. The instant film is formed from a light-shielding resin sheet, and the instant films are stacked and stored, and the instant film has a thickness direction. A pack body comprising a flexible box-shaped portion having a substantially rectangular opening capable of entering and exiting the frame, and a frame-shaped flange provided continuously around the opening and connected to the edge of the opening; A light-shielding sheet comprising a substantially rectangular lid portion sealed by a flange portion and closing the opening in a light-tight manner and an elongated tongue piece portion provided by extending one end portion in the longitudinal direction; An instant film pack characterized in that by pulling a piece in a predetermined direction, the seal between the flange and the lid is peeled off and the opening is opened. 2. The tongue piece is folded back from the boundary with the lid sealed to the pack body, passes over the lid, and projects out of the contour of the pack body. 2. The instant film pack according to claim 1, wherein the seal between the flange and the cover is peeled off and the opening is opened by pulling the cut portion away from the pack body. 3. The method according to claim 1, wherein at least the lid and the flange in the vicinity of the folded boundary of the tongue piece are sealed in a mountain-shaped pattern with a peak toward the tip end of the tongue piece. 3. The instant film pack according to claim 2, wherein: 4. A part of the flange portion engages with an engagement means provided in a pack loading chamber on a camera side in which the pack body is loaded, and the pack body follows the pulling of the light shielding sheet. The instant film pack according to any one of claims 1 to 3, further comprising an engaged means for preventing the instant film pack from being deformed. 5. The instant film pack according to claim 1, wherein a groove serving as a fold is formed on an outer surface of a bottom of the box-shaped portion.