JPH10228080A - Instant film pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film pack where the loading operation of a film unit is easily quickly performed, waste is reduced and whose cost is low and also where the pressure fogging of the film unit is prevented. SOLUTION: The light-shielded bag 2 of the film pack 1 is formed of one belt-like sheet member 2a, and is disassembled by pulling the top end part 9b of a tongue piece part 9 in one direction. The sheet member 2a is constituted by laminating polyethylene terephthalate on a polyethylene sheet, and providing an aluminum evaporation layer having small permeability on it, and applying the adhesive material for weak sealing on a surface on an opposite side and possesses gas-barrier performance. The film pack 1 is manufactured at the inside of a room where temperature s maintained at 23 deg.C and relative humidity is maintained as 50% to 80%. Air at the inside of the room is sealed before hermetically sealing, and the light-shielded bag 2 is swollen up to such a degree that external pressure is not directly applied to the film unit 3.

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, and more particularly, to an instant film pack which can easily and quickly load a film unit, and has little waste and low cost.

[0002]

2. Description of the Related Art There is known an instant film pack (hereinafter, referred to as a film pack) which is used by being loaded into an instant camera. As described in, for example, JP-A-7-209814, this film pack is a rectangular mono-sheet type self-developing processing type in a box-shaped hard plastic light-shielding container (hard case). A plurality of film units (hereinafter, referred to as film units) are stacked and stored. This film unit captures and cures a developing solution pod in which a developing solution is sealed at one opposite edge of a photosensitive sheet having a photosensitive layer and an image receiving layer, and an excess developing solution at the other edge. It is provided with a trap portion and can be handled as one sheet until the end.

The hard case is formed with an exposure opening and a discharge opening for discharging the exposed film unit. Inside the hard case, a hard plastic thin film for shielding the exposure opening from light is provided. A plate-shaped light-shielding cover is stored so as to overlap the exposure surface of the uppermost film unit, and a spring member for pressing the film unit toward the exposure opening side is stored between the lowermost film unit and the inner wall surface. . As described above, although the hard case of the film pack has a complicated structure and is expensive, after all the built-in film units have been photographed, they are discarded as garbage, which results in cost and resource conservation. There was a problem in terms of environmental protection.

On the other hand, JP-A-3-89338 discloses that
An opening for taking out a film sheet is provided on a side of a flexible bag containing a plurality of laminated X-ray film sheets, and the opening is sealed with a light-shielding cover. ing. This package is once loaded in a magazine and then mounted on an X-ray apparatus. The tip of the light-shielding cover is wrapped around a spindle in the magazine, and when the magazine is loaded into the X-ray apparatus, the spindle is driven to peel off the light-shielding cover from the flexible bag, exposing the opening. . Next, after the film sheet is pulled out through the opening by the suction device or the finger provided in the X-ray apparatus, the film sheet is transferred to a predetermined position in the apparatus by the film driving roller.

Japanese Patent Laid-Open Publication No. 8-62782 discloses that
A package is described in which a plurality of laminated film sheets are partially surrounded by a protective carrier, and the protective carrier and the film sheet are wrapped in a flexible light shielding package. When this film pack is loaded into the printer,
One end of the film pack is cut, and the other end is grasped and removed by a roller, so that the protective carrier and the film sheet remain in the printer.

[0006]

A film pack using the above-mentioned film unit instead of the film sheet in the package or package described in the above publication is conceivable, but has the following problems. The package described in Japanese Patent Application Laid-Open No. 3-89338 is advantageous in that the cost is low and the amount of waste is small as compared with the film pack using the hard case. However, once the magazine is loaded into the magazine, This is troublesome in that it requires a double effort to mount the camera on the apparatus and that it is necessary to take out the previous flexible bag and light shielding cover remaining in the magazine when the film unit is loaded. Further, since the bag is flexible, if the bag is inadvertently gripped with a strong force and pressed from above the bag, the internal film unit may cause pressure fog.

A package as described in Japanese Patent Application Laid-Open No. 8-62782 is lower in cost and less waste than a film pack using the hard case.
Further, it is more advantageous than the film pack described in JP-A-3-89338 in that no magazine is used. However, since a very large force is required to pull out the light shielding package with a roller, a large driving motor or the like is required, which increases the size of the camera and increases the cost of the camera. Further, since the protection carrier remains in the film loading chamber, it is troublesome to take out the protection carrier when loading the film unit. In addition, since the light shielding package is flexible, when an external pressure is applied similarly to the flexible bag, the internal film unit may cause pressure fog.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a film pack in which the loading operation of the film unit is simple and quick, the amount of waste is small, the cost is low, and the pressure fog of the film unit can be prevented.

[0009]

In order to achieve the above object, a film pack of the present invention comprises an instant film pack in which a plurality of self-developing type film units are stacked and light-tightly housed in a light-shielding bag. In the above, the light-shielding bag is formed of a single band-shaped sheet member formed in a bag shape so as to be disassembled by pulling one end in one direction, and is filled with air or gas and inflated. is there. Further, the sheet member is formed of a material having a low gas permeability. The air has a relative humidity of 50% to 80%.

In an instant film pack in which a plurality of self-developing type film units are stacked and light-tightly housed in a light-shielding bag, the light-shielding bag is disassembled by pulling one end in one direction. A first plate member having the same size of rigidity as the film unit is provided at one end of the sheet member so as to substantially cover one outer surface of the light shielding bag. And a second plate member having substantially the same size of rigidity as the film unit is provided in the light shielding bag opposite to the guide plate with the film unit interposed therebetween, and the first and second plate members In addition, an external pressurization of the film unit stored in the light shielding bag is prevented.

In an instant film pack in which a plurality of self-developing type film units are stacked and light-tightly housed in a light-shielding bag, the light-shielding bag is disassembled by pulling one end in one direction. A plate member having substantially the same size of rigidity as the film unit is provided at a position sandwiching the laminated film unit in the light-shielding bag. The plate member prevents external pressure from being applied to the film unit housed in the light shielding bag.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1 showing the appearance of a film pack according to the present invention, a film pack 1 has a relative humidity of 50.
A light-shielding bag 2 filled with air of 80% to 80%,
It comprises a plurality of, for example, ten, film units 3 stacked and housed therein. In order to enclose air having a relative humidity of 50% to 80% in the light-shielding bag 2, the air in the room where the film pack 1 is manufactured is heated at 23 ° C. and a relative humidity of 50% to
At 80%, the film unit 3 is inflated so that external pressure is not applied directly, and a hermetic seal described later is performed. Thus, even if the film pack 1 is inadvertently strongly gripped when the film pack 1 is handled, the internal film unit 3 is prevented from causing pressure fog.

The reason for setting the relative humidity of the air sealed in the light-shielding bag 2 to 50% to 80% is to prevent the inside of the light-shielding bag 2 from drying excessively and causing the internal film unit 3 to not generate static fog. That's why. The amount of air sealed in the light shielding bag 2 is 20% to 80% of the effective volume of the laminated film unit 3 (the volume connecting the four corners of the uppermost film unit and the four corners of the lowermost film unit). %, For example, an effective volume of 108 cm
³ (= 97 mm x 101 mm x 11 mm), plus 40 cc.

The film unit 3 is a self-developing type, and as is well known, a photosensitive sheet 4 having a photosensitive layer and an image receiving layer, a developing solution pod 5 containing a developing solution, and a surplus developing solution. Trap section 6 to capture and harden
Are unitized and are rectangular mono-sheet types that can be handled as one sheet until the end.

As shown in FIG. 2, the light-shielding bag 2 has a length D ₁ (about 416 mm) in the longitudinal direction which is about 4.3 times the length D ₂ (about 96 mm) of the film unit 3. Is formed from the sheet member 2a. This sheet member 2
a is composed of a substantially rectangular wrapping portion 8 that wraps ten laminated film units 3 in two, and a tongue piece 9 provided with one end thereof extended in the longitudinal direction.

As shown in FIG. 3, the sheet member 2a is formed by laminating a 16 μm thick polyethylene terephthalate (PET) 11 on a 40 μm thick polyethylene sheet (PE) 10 mixed with, for example, carbon black. An aluminum vapor-deposited layer 12 having a small transmittance (having a gas barrier property) is provided at a thickness of 400 °, and an adhesive 13 for a urethane-based weak seal is applied on the opposite surface. This prevents air or gas (for example, nitrogen gas or the like can be used instead of air) sealed in the light shielding bag 2 from being released during the warranty period of the film unit 3. The adhesive 13 after being applied and dried
Does not adhere to other objects or adsorb dust in normal handling, and exhibits an adhesive force only when heated and pressed.

The gas permeability of the sheet member is determined according to JIS K7
126 is a value measured by the A method. The measured value is 1.0 cc / m ² · 24 ^hr · atm · 20 ° C. The gas used for the measurement is air. Further, in the measurement in a state where a film pack was formed using this material, it was confirmed that the film pack was put in a decompression container, the pressure was reduced at 400 mmHg for 1 hour, and the expanded state could be maintained. As a result of the test, the gas permeability of the material that can be used as the sheet member of the present invention is 100 in consideration of the quality that can be maintained for two years in which the product is used.
^{cc / m 2 · 24 hr ·} atm or less, preferably 60cc / m ² · 24 ^hr
・ Must be atm or less. Materials that can be used are acrylic, polyamide, polyvinylidene chloride, ethylene vinyl alcohol, polyethylene terephthalate, polyvinyl chloride, and polyolefin films, or a combination thereof, in consideration of moisture resistance.
Further, these aluminum vapor-deposited and SiO ₂ vapor-deposited films are preferable.

The packaging portion 8 has a rectangular shape of width D ₃ × length D ₄ , and both corners of the end portion 8a are chamfered. The width D ₃ of the packaging unit 8 is equal to the width D ₅ of the film unit 3 (about 96 m).
m), which is slightly larger than about 123 mm, and the length D ₄ is about 220 which is slightly longer than twice the length D ₂ of the film unit 3.
mm. The tongue piece 9 includes a base 9a having one end portion of the packaging portion 8 extended by a length D ₆ (10 mm) and a tip portion αR.
(Α = 160 mm) and the width D _{7 of the} tip 9 b
And a narrow width portion 9c having a width of 60 mm.

FIG. 2 shows the sealing portion 1 by hatching with imaginary lines.
4a, 14b and 15 are drawn. These seal portions 14
Reference numerals a, b, and 15 depict portions that are heated and pressed so as to have their respective shapes and are weakly sealed when the light shielding bag 2 is formed. Seal portions 14a, 14
b is a linear weak seal having a width D ₈ (4 mm) from each chamfered end 8a to the edges 8b, 8c on both sides of the packaging portion 8 to the corners P, Q of the base 9a of the tongue piece 9; It is the part that is done. The seal portion 15, the corner P, the width D ₃ directions corners P between Q, tip 9b a top portion 15a of Q as both ends of the foot
It is a portion that is weakly sealed in a mountain shape with a width D ₉ (2 mm) on the side.

The production of the film pack 1 using such a sheet member 2a is performed at 23 ° C. and a relative humidity of 50% to 80%.
It is performed in a room kept in the room. First, the sheet members 2a folded in two sheet members 2a at fold line 16 of half the length D ₄ of the packaging unit 8, to insert the ten photo film units 3 stacked during this time. Next, the tongue piece 9 is superimposed on the packaging part 8 so as to wrap the film unit 3, and the seal part 15 is formed by heating and pressurizing the tongue piece from above, and as shown in FIG. The base 9 a of the part 9 is adhered to the surface near the end 8 a of the packaging part 8. As a result,
The sheet member 2a becomes cylindrical, and the film unit 3 is wrapped in this cylinder.

Thereafter, the opening 17 formed in the packaging portion 8 is formed.
a, 17b, edges 8 near four corners of film unit 3
After b and 8c are folded so as to form an M-shape when viewed from the side, room air is sealed in the wrapping portion 8, and the wrapping portion 8 is inflated. In this state, the opposing seal portions 14a and 14b are brought into close contact with each other and heated and pressed from the outside, so that the edges 8b,
8c is lightly sealed weakly. The degree of swelling of the wrapping portion 8 is such that even if the wrapping portion 8 is strongly pressed in the thickness direction, pressure is not directly applied to the film unit 3 stored therein, particularly the photosensitive sheet 4.

Thereafter, the tongue piece 9 of the sheet member 2a is slightly moved from the top 15a of the seal portion 15 to the developing solution pod 5.
The film pack 1 as shown in FIG. 1 is completed by folding back from the close position and wrapping around the trap section 6 so that the tip 9b of the tongue piece 9 projects outward from the developing solution pod 5. .

The film pack 1 is, as shown in FIG.
It is used by being inserted into the film loading box 32 of the instant camera 30. This film loading box 32
Is rotatably mounted inside the back cover 33,
A spring (not shown) mounted on the shaft portion 34 urges the shaft portion 34 away from the back cover 33, and the degree of opening is regulated by the stopper 36. Similarly, since the degree of opening of the back cover 33 is also regulated,
Is opened to the stop position, the pack insertion opening 32a of the film loading box 32 is exposed between the camera body 31 and the back cover 33 as shown in the figure. The film loading box 32 has an aperture 32b formed on the photographing lens side wall, and an opening 32c for receiving the pressure plate 38 formed on the back cover side wall.

A driven roller 41 is provided above the back cover 33. When the film pack 1 is inserted into the film loading box 32 and the back cover 33 is closed, as shown in FIG. Driving roller 42 provided on top
, The tongue piece 9 of the film pack 1 is sandwiched, and the leading end 9b is projected outside. When the film pack 1 is inserted into the film loading box 32, the film pack 1 may be inadvertently gripped strongly. However, since air is contained in the light shielding bag 2,
No pressure is directly applied to the film unit 3 in the light shielding bag 2.

When the shutter button is depressed, the drive roller 42 rotates counterclockwise, and the tongue piece 9 is moved to the camera body 3.
The paper is discharged from a slit-shaped pack discharge port 44 formed between the rear cover 1 and the back cover 33. As the tongue piece 9 is discharged, first, the pulling force concentrates on the top portion 15a of the seal portion 15, so that the top portion 15a starts to be easily peeled off with a slight pulling force. When the top 15a begins to peel off, the air inside the inflating light shielding bag 2 becomes
Is discharged from The peeling of the top portion 15a gradually propagates toward the corners P and Q, which are the foot of the mountain, and the sealing portion 1a is completely removed.
5 are peeled off, the sealing portions 14a, 1
4b begins to peel off.

When the seal portions 14a and 14b are completely peeled off, the light shielding bag 2 returns to the original single sheet member 2a and is discharged from the pack discharge port 44. As a result, the ten film units 3 remain in a stacked state in the film loading box 32, and the film loading is completed. Note that, instead of the driven roller 41, the sheet member 2a can be discharged by pulling the tongue piece 9 by hand.
In this case, if a cloth having fluff (for example, velvet) is stuck inside the pack outlet 44, the pack outlet 4
4 can be shaded.

When the photographing lens 46 is pointed at the subject and the shutter button is pressed down, photometry is performed, and then the shutter is driven to expose the uppermost film unit 3a through the aperture 32b. Immediately after the completion of the exposure, the delivery claw incorporated in the camera body 31 operates to engage with the end of the exposed film unit 3a on the trap portion 6 side,
The film unit 3a is pushed up toward the film discharge ports 48 and 49, and the drive roller 42 starts rotating clockwise.

When the developing solution pod 5 end of the film unit 3a is pushed out from the film discharge port 48, the driving roller 42 and the driven roller 51 sandwich the developing solution pod 5 to crush the developing solution pod 5.
To the film discharge port 49. While the film unit 3a is discharged from the film discharge port 49,
The developing solution is uniformly spread on the photosensitive sheet 4 of the film unit 3a by the driving roller 42 and the driven roller 51. When a predetermined time elapses after the film unit 3a is discharged from the film discharge port 49, a positive image of the subject appears on the surface 4a of the photosensitive sheet 4 of the film unit 3a.

Thereafter, by similarly operating the shutter button, all the film units 3 in the film loading box 32 can be sequentially exposed one by one.
When the photographing of all the film units 3 is completed, the inside of the film loading box 32 becomes empty, so that it is not necessary to remove the empty pack as in the conventional case, and the loading of a new film can be performed very simply and quickly. it can.

As the film unit, an instant film “AC” manufactured by Fuji Photo Film Co., Ltd. was used.
E "(trade name) and Polaroid Instant Film" Spectra "(trade name) are used. In addition,
In "ACE", an image appears on the surface opposite to the exposure surface, and in "Spectra", an image appears on the same side as the exposure surface.

"ACE" type film unit 3
Consists of a photosensitive sheet and a cover sheet. The surface of the photosensitive sheet becomes an exposure surface, and an image appears on the surface of the cover sheet. The photosensitive sheet is provided on a support having a back layer,
An image receiving layer, a white reflective layer, a light-shielding layer, a red-sensitive emulsion layer, a green-sensitive emulsion layer, a blue-sensitive emulsion layer, a UV absorber layer, and a protective layer are provided in this order. A color mixing prevention layer is provided. In the cover sheet, a filter dye layer is provided on a support, a neutralizing layer and a timing layer are sequentially provided below the support dye layer.

The sheet member used in the present invention is required to have high light-shielding properties, high lubricity and moderate rigidity in addition to the gas barrier properties described above. The light passing from the sheet surface of the sheet member in order to secure the light shielding property of the film unit must be at least 0.01 lux second or less,
For example, in order to guarantee a light shielding property of 100,000 lux and 100 seconds, the external light needs to be reduced to 1/10 ⁹ or less. For this reason, it is preferable that carbon black, aluminum foil, aluminum vapor deposition, or a combination thereof is applied to the sheet member. The amount of carbon black added is 1g
/ M ² or more, preferably 1.5 g / m ² or more. The carbon black used is preferably a low sulfur component, for example, a material described in JP-A-3-179342.

Further, WO (International Publication) 89/1284
According to Japanese Patent Publication No. 7 (1994), carbon usually contains a cyanide compound. It is known that a cyan compound has a chemical effect on a photographic film, and an increase in its content adversely affects photographic properties. The content of the cyan compound which does not cause a problem in photographic performance varies depending on the amount of carbon used, but is generally 3 ppm / carbon weight. The cyan compound content here is determined by the following method.

The carbon is refluxed in the presence of sulfuric acid, and the generated hydrogen cyanide is trapped with a 0.1N aqueous sodium hydroxide solution, and then quantified by 4-pyridinecarboxylic acid / pyrazolone absorption spectrometry. Thereafter, this amount of hydrogen cyanide is converted into ppm units based on the weight of carbon.

The cyanide content of carbon is DBP
(Dibutyl peroxide) Very correlated with oil absorption. DBP
In the case of carbon having an oil absorption of less than 65 ml / 100 g, the cyan compound content is in a dangerous area for photographic performance. There is also a strong correlation between the amounts of ash contained in the carbon. The ash content is 0.5% or more, and the cyan compound content falls within the dangerous range for photographic performance.

Therefore, the carbon used in the present invention is
Carbon having a DBP oil absorption of 65 ml / 100 g or more, or 0.5% or less if defined by the ash content, and carbon having a cyanide content of 2 ppm or less in the above-described measurement method is preferable.

The polymer used for the sheet member is polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polyamide (PA),
Polycarbonate (PC), polystyrene (PS), polyphenylene oxide (PPO) and the like are listed, and they are complex in terms of rigidity, adhesive adhesion, carbon black dispersibility, ease of lamination, ease of vapor deposition layer, etc. used.

A point to be noted in the light-shielding property is a pinhole-shaped light leakage phenomenon. This is because light fog occurs when unevenness in the thickness of the light-shielding layer or the vapor deposition layer and repelling phenomenon occur. In addition, when the film unit is wrapped in a bag with a sheet member, if there is poor bonding of the sealing surface, light may enter the sealing surface, so care must be taken in sealing conditions and coating uniformity of the bonding surface. Must.

To impart lubricity to the sheet member, there are a method of adding it to the outermost layer of the sheet member and a method of coating.
Lubricants include silicone oils, higher fatty acid amides such as oleic acid amide, metal salts of higher fatty acids such as zinc stearate, higher alcohol esters, fatty acid esters of polyhydric alcohol esters, and acrylic fine particle mats. And a method of applying a silica-based matting agent to the surface layer.

The smaller the rigidity, the lower the resistance to pull out. However, the material tends to be easily torn, and if the torn material partially remains in the camera, it is reflected in the image during photographing, causing a problem. Further, if the rigidity is large, the resistance becomes excessive when the wire is pulled out. Materials with low stiffness can be classified into PE, PA, and materials with high stiffness, such as PET, PC, and PS. By combining these and adjusting the thickness,
Optimal rigidity can be secured.

Providing moisture resistance is effective in protecting the film. The surface transmittance of water is 24 ° C. 9
It is preferable that the material be 5 mg / 24 hr · 1 m ² or less in an atmosphere of 0%. However, if the moisture-proof property of the weakly sealed portion cannot be ensured, the use of an external packaging material further increases the moisture-proof property. Can be secured. In this case, it is not necessary to ensure the moisture resistance of the sheet member. Aluminum foil, aluminum evaporation, ceramic evaporation and the like can be used to ensure moisture proofness.

After the film unit is wrapped around, the film surface and the sheet member are rubbed and pulled out. Therefore, the lower the air resistance of the film surface, the less the occurrence of static fog. There is a method of kneading or coating an antistatic agent or carbon black on at least the outermost layer on the side (inside) of the sheet member that wraps the film unit.

The weak seal means that two sheet members are
After bonding with an area of 0 mm × 5 mm, one sheet member is fixed and the other sheet member is pulled in the horizontal direction and in the longitudinal direction of the bonding area, and the two sheet members are 5 mm apart from each other.
The adhesive has a maximum tensile strength of 700 g or less, preferably 100 g or more and 500 g or less when peeled.

As the adhesive, a thermoplastic adhesive is used. For example, as a vinyl-based resin, polyvinyl acetate, polyacrylate, as a polycondensation-based resin, polyamide, polyester, and as a polyaddition-based resin, thermoplastic polyurethane, polyvinyl alcohol, and the like can be given.
These may be used in combination. It is effective to put a matting agent on the adhesive surface in order to impart lubricity.

In order to impart a weak sealing property, the coating amount of the adhesive is reduced, and the molecular weight and other resins (for example, filler, plasticizer,
It is effective to reduce the cohesion by adding a thickener. Alternatively, the sealing surface of the sheet member may be treated with a material that is difficult to adhere (for example, silicone, a fluorine-based material, or the like) to reduce the adhesive strength at the interface.

In the embodiment described above, air or gas is sealed in the light-shielding bag in order to prevent the film unit in the light-shielding bag from being pressurized. However, a plurality of laminated film units are sandwiched from both sides. A plate member having rigidity may be arranged. In the embodiment shown in FIG. 7, the tongue piece portion 56 of the light-shielding bag 55 is shorter than that of the above-described embodiment, and a resin guide plate 58 having substantially the same shape as the film unit 3 or having slightly greater rigidity is provided at the tip thereof. It is fixed. In the light shielding bag 55, a rigid resin backing plate 59 is provided at a position sandwiching the film unit 3 laminated between the light blocking bag 55 and the guide plate 58.

When handling the light shielding bag 55, the guide plate 5
If the light-shielding bag 55 and the guide plate 58 are handled integrally without turning over the film 8, the film unit 3 in the light-shielding bag 55 is sandwiched between the guide plate 58 and the backing plate 59, and is always externally applied. No pressure and no fogging.

As shown in FIG. 8, when the light-shielding bag 55 is inserted into the film loading chamber 62 of the instant camera 60 so that the guide plate 58 is on the back side, and the back cover 63 is closed, the inside of the back cover 63 The guide plate 58 is positioned directly below the film discharge port 65 by the provided pressure plate 64. After this,
When the shutter button is depressed, the delivery claw incorporated in the camera body 61 is operated, and the guide plate 58 is pushed upward from the film discharge port 65.

The leading end of the guide plate 58 projecting from the film discharge port 65 is sandwiched by the developing rollers 67 and 68 and discharged from the film discharge port 69 to the outside. Since the tongue piece 56 is connected to the guide plate 58, the tongue piece 56 is pulled as the guide plate 58 is discharged, the light-shielding bag 55 is disassembled, and returns to the original belt-shaped sheet member 55a. When all the sheet members 55a are discharged from the film discharge port 69, the backing plate 59 is left in the film loading chamber 62 together with the stacked film units 3.
The backing plate 59 is automatically discharged to the outside from the film discharge port 69 after the last film unit 3b has finished photographing and discharged.

The light-shielding bag 71 shown in FIG. 9 has a pair of rigid resin-made backing plates 73, 74 housed therein with the laminated film unit 3 interposed therebetween. Patch plate 7
The reference numerals 3 and 74 are substantially the same as or slightly larger than the film unit 3 so as to substantially cover the film unit 3. When the light-blocking bag 71 is loaded into the instant camera, one patch 73 is discharged immediately after the loading, and the other patch 74 is discharged after the last film unit 3b is discharged.

In the embodiment described above, an aluminum vapor-deposited layer is provided on polyethylene terephthalate in order to impart a gas barrier property to the sheet member. In addition, an aluminum foil and a ceramic vapor-deposited layer (for example, SiO ₂ ) are provided. Alternatively, chrome printing may be performed. It is also preferable to provide an aluminum vapor-deposited layer or the like that provides such a gas barrier property from the viewpoint of providing moisture-proof properties. Further, in the above embodiment, the adhesive for weak sealing is applied to the entire surface of one side of the sheet member. However, the adhesive may be applied only to the portion to be actually sealed.

[0052]

As described above, according to the film pack of the present invention, a light-shielding bag for storing a plurality of film units in a stacked state is disassembled into one band-like sheet member by pulling one end in one direction. After filming, there is no residue in the film loading chamber of the camera, and the film unit can be loaded easily and quickly.
Since the waste is only one sheet member, it is advantageous in terms of resource protection and environmental protection and can be produced at low cost. Since the light-shielding bag is inflated by enclosing air or gas therein, the external pressure applied to the light-shielding bag is not directly applied to the inside film unit, and pressure fogging of the film unit can be prevented.

Further, since the sheet member is formed of a material having a low gas permeability, the rate at which air or gas in the light shielding bag escapes is extremely low. Thereby, it is possible to prevent air or gas from leaking out of the light-shielding bag during the guaranteed period in which the film unit can shoot, for example. In addition, since the relative humidity of the air is set to 50% to 80%, it is possible to prevent the inside of the light shielding bag from drying excessively and causing the internal film unit to generate static fog.

Also, a first plate member having substantially the same rigidity as the film unit is fixed to one end side of the sheet member so as to substantially cover one outer surface of the light shielding bag.
Since the second plate member having substantially the same size of rigidity as the film unit is provided in the light-shielding bag opposite to the guide plate with the film unit interposed therebetween, the film accommodated in the light-shielding bag by the first and second plate members is provided. External pressure on the unit can be prevented.

Further, plate members having substantially the same rigidity as the film unit are provided at positions sandwiching the laminated film units in the light shielding bag, so that the film unit housed in the light shielding bag by the pair of plate members is provided. External pressure can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of a film pack embodying the present invention.

FIG. 2 is a development view of a light shielding bag.

FIG. 3 is an explanatory diagram showing a layer structure of a sheet member.

FIG. 4 is a perspective view of a film pack showing a cylindrical packaging unit.

FIG. 5 is an explanatory diagram showing a state in which a film pack is loaded into an instant camera.

FIG. 6 is an explanatory diagram showing a state immediately after a back cover of the instant camera is closed.

FIG. 7 is a sectional view showing another embodiment of a light-shielding bag in which a guide plate is connected to a tongue piece.

8 is a cross-sectional view showing a state where the light-shielding bag shown in FIG. 7 is loaded in an instant camera.

FIG. 9 is a cross-sectional view showing another embodiment of a light-shielding bag in which a pair of backing plates are housed with a film unit interposed therebetween.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Film pack 2,55,71 Light shielding bag 2a Sheet member 3 Film unit 12 Aluminum vapor deposition layer 58 Guide plate 59,73,74 Backing plate

Claims (5)

[Claims] 1. An instant film pack in which a plurality of self-developing film units are stacked and light-tightly housed in a light-shielding bag, wherein the light-shielding bag is disassembled by pulling one end in one direction. An instant film pack comprising a single band-shaped sheet member formed in a bag shape as described above, and inflated by enclosing air or gas therein. 2. The instant film pack according to claim 1, wherein the sheet member is formed of a material having a low gas permeability. 3. The instant film pack according to claim 1, wherein the air has a relative humidity of 50% to 80%. 4. An instant film pack in which a plurality of self-developing film units are stacked and light-tightly housed in a light-shielding bag, wherein the light-shielding bag is disassembled by pulling one end in one direction. A first plate member having the same size of rigidity as the film unit is provided at one end of the sheet member so as to substantially cover one outer surface of the light shielding bag. And a second plate member having substantially the same size of rigidity as the film unit is provided in the light shielding bag opposite to the guide plate with the film unit interposed therebetween, and the first and second plate members An instant film pack wherein the external application of pressure to the film unit stored in the light shielding bag is prevented. 5. An instant film pack in which a plurality of self-developing film units are stacked and light-tightly housed in a light-shielding bag, wherein the light-shielding bag is disassembled by pulling one end in one direction. A plate member having substantially the same size of rigidity as the film unit is provided at a position sandwiching the laminated film unit in the light-shielding bag. An instant film pack, wherein a plate member prevents external pressure from being applied to the film unit stored in the light shielding bag.