JPH0314657Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a film pack for storing a plurality of peel-apart type instant film units.

[Conventional technology]

There are two types of instant film units (hereinafter referred to as film units): mono sheet type,
There is a peel-apart type, and these are stored in a film package in an overlapping state. This film pack has a rectangular exposure aperture,
A pack body is formed with a film drawer opening for pulling out an exposed film unit and has an open bottom, a bottom cover is attached to the bottom of the pack body, and the film pack body is disposed between these.
It consists of a film pushing plate that pushes the film unit toward the exposure aperture.

The film pack is sold in a light-shielding bag, but it is sometimes left as is for a while without being loaded into the camera immediately after being taken out of the bag. In order to prevent the first film unit located at the top of the film pack from being exposed to light even when the film pack is left alone, a light-shielding sheet is placed over the first film unit. ing. As this light-shielding sheet, carbon-containing paper is used to provide light-shielding properties, and a strong sheet with a thickness of about 125 μm is used to prevent wrinkles.

Within the film pack, there is good adhesion between the film units, so even if light goes around inside the film pack, no light will enter between them. However, due to its rigidity, the light-shielding sheet may partially float, albeit very slightly, and a partial gap is formed between the pack body and the first film unit, which allows the light-shielding sheet to float slightly. The emitted light enters the film pack and causes fog on the rear end of the photosensitive surface of the first film unit. In order to prevent such light leakage, the inner surface of the pack body has conventionally been treated with a matte finish, but this has not yet completely prevented light leakage. In addition, it is effective to prevent light leakage by increasing the pressing force of the film pressing plate and strongly pressing the light-shielding sheet and film unit toward the inner surface of the pack body. It becomes difficult to pull it out of the pack.

[Problem that the invention attempts to solve]

SUMMARY OF THE INVENTION An object of the present invention is to provide a film pack for a peel-apart film that can reliably prevent light leakage without increasing the pull-out resistance of the film unit.

[Means for solving problems]

In order to achieve the above object, the present invention presses the rear end of the light-shielding sheet against the rear end of the first film unit to prevent exposure by light rays entering from the film outlet.
A protrusion is provided on the inner surface of the film pack and extends in a direction perpendicular to the direction in which the film unit is pulled out.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

〔Example〕

FIG. 1 shows an exploded film pack 10. The film pack 10 consists of a pack body 11 integrally molded from black plastic, and a metal bottom cover 12 fitted to the bottom of the pack body 11. , and a metal film pushing plate 13 housed within the pack body 11.

The pack body 11 includes an upper wall 20, side walls 21 and 22, a rear wall 23, and a front wall 2 that projects slightly downward so as to leave a film drawer opening 24.
5, and the inner surface has been treated with a matte finish. A rectangular exposure opening 26 is formed in the upper wall 20, and a rectangular exposure opening 26 is formed along the rear edge (based on the drawing direction) and both side edges of the exposure opening 26 to prevent light leakage to the inner surface. A protrusion 27 with a relatively low height (approximately 0.25 mm) is formed along the front edge of the exposure aperture 26 to prevent scratches on the protrusion 27 when the film unit is pulled out. A large number of protrusions 28 with sharp tips are formed.

A protrusion 27 formed at the rear edge of the exposure aperture 26
Two protrusions 29a and 29b are placed next to and parallel to this.
is formed. These protrusions 29a, 29b
As will be explained in detail later with reference to FIG. 3, by pressing the rear end of the light shielding sheet 63 against the first film unit, the first film unit is lifted due to the rigidity of the light shielding sheet 63. To prevent fog from occurring at the rear end of the photosensitive surface of the film unit 60. These protrusions 29a, 29
Although the width and height of b are 1 mm, they are sufficiently effective in preventing exposure. In addition, in this example,
Although the protrusions 29a and 29b are divided, they may be one continuous protrusion.

In order to prevent light leakage from the side edges of the exposure aperture 26, a groove 30 is provided next to the protrusion 27 and a protrusion 31 is provided.
is formed. Since the two protrusions 27 and 31 are arranged by the groove 30, the path of the light entering from the side edge of the exposure aperture 26 is bent into two stages. This makes it difficult for light to pass through the sides of the film pack 10 and the light shielding sheet 63.

A rib 32 is provided near the intersection of the front edge and side edge of the exposure opening 26 so as to close the groove 30. The ribs 32 have a streamlined shape that is inclined so that the height decreases toward the rear end of the light shielding sheet 63 so that the light shielding sheet 63 can easily fit therein. The degree of inclination of the ribs 32 is determined depending on the material of the light shielding sheet 63.

The side walls 21 and 22 of the pack main body 11 have two notches 35a and 35b formed at their lower ends, respectively, and a locking member protruding outwardly at the bottom for fitting the bottom cover 12. A mating protrusion 36 is formed.

The film pressing plate 13 includes a pressing plate part 40 for ensuring the flatness of the film unit, a pair of leg parts 41 having both sides thereof bent downward, a film fixing part 42 inclined downward, and an arcuate shape. It consists of a curved film guide section 43, which is made of a bent metal plate and then painted black. The film fixing portion 42 has a tip portion 42
A is folded back upwards, and two holes 42b for fastening staples are formed.
Two bulges 41a are formed at the lower part of the leg portion 41 to prevent it from slipping out from the side wall 22 of the pack body 11. A recess 43a is formed in the film guide portion 43 in order to impart springiness to the arc-shaped portion at the tip.

In the bottom lid 12, four spring plates 46 to 49 are provided on a plate part 50, which abut against the lower end 41b of the leg part 41 of the film pushing plate 13 and push the film pushing plate 13 upward. These spring plates 4
6 to 49 are formed by forming a substantially U-shaped groove 52 across the plate portion 50 and the side portion 51, and bending the portion remaining inside this groove 52. Among these spring plates 46 to 49, the spring plates 48 and 49 located at the rear are provided with ribs 54 that protrude downward, so that the spring force thereof is, for example, about three times that of the spring plates 46 and 47. It's making me stronger. By increasing the spring force in this way,
By bringing the light shielding sheet 63 into strong contact with the inner surface of the pack body 11, leakage of light from the front edge of the exposure opening 26 can be reliably prevented. Furthermore, even if the spring force of the spring plates 48 and 49 is increased, the light shielding sheet 6
3 and film unit 60 to film pack 1
The withdrawal resistance when withdrawing from 0 does not increase. This includes the light shielding sheet 63 and the film unit 60.
When the film unit 60 is pulled out, the pulling force acts on the film guide portion 43 to slightly curve it downward, increasing the distance between the light-shielding sheet 63 and the inner surface of the upper wall 20 of the pack body 11. This is because the contact pressure with the inner surface of the main body 11 is reduced.

The tip of the side portion 51 is folded back inward, and this portion is attached to the side wall 2 of the pack body 11.
It engages with the engagement protrusion 36 formed at 1 and 22. Further, a rear end portion 55 of the plate portion 50 is curved upward, and this portion is located outside the rear wall 23 of the pack body 11. Furthermore, a notch 5 is provided in the front of the plate portion 50.
6 is formed, a sponge 57 is arranged so as to protrude from this part, and is fixed to the plate part 50 with lugs 58. This sponge 57 is made of hard paper 5
9 and is tilted upwards by a plate disposed diagonally within the camera, thereby pushing up the film unit 60.

FIG. 2 shows a film pack containing a film unit. Actually, 8 monochrome film units are stored, but
To simplify the drawing, only the first film unit is shown. Film unit 60
The image forming apparatus is of a peel-apart type, which consists of a photosensitive sheet 61 and an image receiving unit 62, and the image receiving sheet 62 is peeled off after development. The photosensitive sheet 61
is exposed to light passing through the exposure aperture 26, recording a latent image on its photosensitive surface. The photosensitive sheet 61 is located between the film pressing plate 13 and the pack body 11, and is urged toward the exposure opening 26 by the pressing plate portion 40 of the film pressing plate 13. The image receiving sheet 62 is for receiving a latent image from the photosensitive sheet 61 to form a positive image, and is used for forming a positive image on the pressure plate portion 4.
It is located behind the 0 and between the legs 41. In order to prevent the first photosensitive sheet 61 from being exposed to light passing through the exposure aperture 26, a light shielding sheet 63 is placed so as to wrap around the film unit 60, and its tip protrudes from the film drawer opening 24.

The photosensitive sheet 61 has a photosensitive surface with an exposure opening 26.
A drawer sheet 65 is bonded to the non-photosensitive surface at the tip. Further, a skirt 66 for catching excess developer is bonded to the photosensitive surface at the rear end of the photosensitive sheet 61. The drawer sheet 65 and skirt 66 are made of paper mixed with carbon to eliminate surface reflection. The drawer sheet 65 includes a developer pot 6 in which a developer is resealably sealed.
7 is attached, and a tab 68 is detachably joined to the tip thereof. This tab 68
After being folded back, the tip is joined to the light-shielding sheet 63 via a weak sealing layer.

The image receiving sheet 62 is for recording a final positive image, and is bonded to the mask 70 via a weak sealing layer. This mask 70 is
It has an opening 70a corresponding to the size of both sides, and its tip is joined to the drawer sheet 65. In addition,
Strip-shaped rails are provided on both sides of the opening 70a. Further, although not visible in this sectional view, staples are provided for temporarily fixing the rear ends of the light shielding sheet 63 and the skirt 66 to the film fixing portion 42.

FIG. 3 shows an enlarged view of the main parts of the present invention. The light shielding sheet 63 may have a slight gap between it and the skirt 66 of the first film unit due to its curving or curling. In such a case, if the film pack 10 is left unloaded in the camera and left for a while, light entering from the front wall 25 side will penetrate the photosensitive sheet 61 of the first film unit.
This may cause fog to occur at the rear end. In the present invention, the projections 29a and 29b push the light-shielding sheet 63 downward and bring it into close contact with the skirt 66 of the first film unit, thereby preventing fog from forming on the rear end of the photosensitive sheet 61. can do.

Although in the drawing there is not much free space between the film fixing part 42 of the film pushing plate 13 and the inner surface of the upper wall 20 of the pack body 11, in reality the light shielding sheet 63 and the skirt 66 are Since it is extremely thin compared to the thickness of the film pack 10, there is a considerable amount of extra space near the folded piece 42a. At the positions of these protrusions 29a and 29b, since they are pushed downward, the light shielding sheet 63 and the plurality of skirts 66 thereunder are in close contact with each other. On the right side of these protrusions 29a and 29b, a light shielding sheet 6
3. The plurality of skirts 66 are separated.

Furthermore, the light entering from the side edge of the exposure aperture 26 is
Since the direction of travel is changed by the grooves 30, it becomes difficult to pass through them, and as a result, fogging on both sides of the photosensitive sheet 61 can be reliably prevented. Furthermore, at the front edge of the exposure aperture 26, the strength of the spring plates 48 and 49 is lower than that of the spring plate 4.
6 and 47, the light shielding sheet 63 strongly contacts the front edge of the exposure aperture 26. Therefore, light leakage in this portion is also prevented, thereby preventing fog from occurring at the front end of the photosensitive sheet 61.

After loading the film pack 10 into the camera, open the film drawer opening 24 of the film pack 10.
Grasp the tip of the light-shielding sheet 63 protruding outside with your hand and pull it out. When pulling out the light shielding sheet 63, the pulling force is applied to the film pushing plate 1.
3, this portion curves downward and forms the upper wall 2 of the pack body 11.
The distance from the inner surface of 0 can be increased somewhat. As a result, even though the spring force of the spring plates 48 and 49 is strengthened, the light shielding sheet 63 can be pulled out from the film pack 10 without increasing the pulling resistance. When the light shielding sheet 63 is pulled out, the tab 68 of the first film unit 60 is peeled off from the light shielding sheet 63.

When the light shielding sheet 63 is pulled out from the film pack 10, the photosensitive sheet 61 of the first film unit 60 is located below the exposure aperture 26. When shooting, the light from the subject enters the exposure aperture 2.
6 and reaches the photosensitive sheet 63, which is exposed. If the tab 68 is pulled out by hand after this exposure, the pull-out sheet 65 is pulled out together with the tab 68. At this time, the mask 70 is gradually turned over from its leading end side and moves toward the film drawer opening 24 while overlapping the drawer sheet 65.
Then, the photosensitive sheet 61 is attached to the film guide section 4.
3, it goes around below the pressure plate part 40 and is reversed. The tab 68 is pulled out through the upper side of the unfolding rollers 73 and 74 provided in the camera, so that when the tip of the pull-out sheet 65 comes out a little from between the unfolding rollers 73 and 74, the rear end of the tab 68 is pulled out by the wedge action of the unfolding roller 73.
It is peeled off from 5.

Next, if you grab the tip of the pull-out sheet 65 with your hand and pull it out, the pull-out sheet 65 and the mask 70 will first overlap with each other, and then the unfolding rollers 73, 70
After that, the photosensitive sheet 61 and the image receiving sheet 62 are overlapped with each other and then spread out between the developing rollers 73 and 7.
It passes between 4 and 4. When the drawer sheet 65 passes between the developing rollers 73 and 74, the developer pot 67 attached to it is torn apart.
A jelly-like developer flows out backwards. This flowing developer is spread by developing rollers 73 and 74 to have a uniform thickness between the photosensitive sheet 61 and the image receiving sheet 62, and the latent image recorded on the photosensitive sheet 61 is converted into a positive image on the image receiving sheet 62. Transcribe. When the image receiving sheet 62 is peeled off from the mask after a predetermined peeling time has elapsed, an instant photograph has been recorded thereon. Note that excess developer is stored between the skirt 66 and the rear end of the mask 70.

[Effect of idea]

The present invention having the above configuration forms protrusions on the inner surface of a film pack for peel-apart film,
Since the light-shielding sheet is pressed against the rear end of the film unit by this protrusion, it is possible to reliably prevent fog from forming on the rear end of the photosensitive surface even if the film pack is left alone. be able to. Furthermore, since light leakage is not prevented by strongly pressing the light-shielding sheet against the inner surface of the film pack, the pull-out resistance does not increase.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of the film pack of the present invention. FIG. 2 is a schematic cross-sectional view of the film pack showing the state in which the film unit is housed. FIG. 3 is an enlarged sectional view showing the main parts of the present invention. 10...Film pack, 11...Pack body, 12...Bottom cover, 13...Film push plate, 2
6...Exposure aperture, 29a, 29b...Protrusion, 2
7, 31...protrusion, 30...groove, 46-49...
... Spring plate, 54 ... Rib, 60 ... Film unit, 61 ... Photosensitive sheet, 62 ... Image receiving sheet, 63 ... Light shielding sheet, 65 ... Drawer sheet, 66 ... Skirt, 67 ... Developer pot ,
68...Tab, 70...Mask, 73,74...
Deployment roller.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A pack body with a rectangular exposure opening formed on the top surface and a film drawer opening formed on the front face, and an open bottom, and a bottom attached to the bottom of the pack body. A lid, a pressure plate portion having a size similar to that of the exposure aperture between these, a curved film guide portion located away from the film drawer opening of the pack body, and a pair of film guide portions provided on both sides of the pressure plate portion. A film unit holding plate having legs is provided, a light-shielding sheet and a photosensitive sheet of the instant film unit are positioned on the pressure plate, and the pair of legs extend along the pressure plate and the sheet traveling direction. A drawer sheet connected to the tip of the photosensitive sheet and an image receiving sheet connected to the drawer sheet via a mask sheet are housed in the space surrounded by the drawer sheet. A film pack for a peel-apart film in which the photosensitive sheet is reversed along the film guide section to meet the image-receiving sheet by being pulled from the film drawer opening of the main body, and the inner surface of the film pack main body, and the Between the peripheral edge of the exposure opening and the end face of the pack body in which the film drawer opening is formed, a portion facing the rear end of the light shielding sheet and the photosensitive sheet extends in a direction perpendicular to the direction in which the instant film unit is pulled out. A protruding member is provided, and the protruding member presses the rear end of the light-shielding sheet against the rear end of the photosensitive sheet, thereby preventing the rear end of the photosensitive sheet from being exposed to light rays entering from the film outlet. Film pack for peel-apart film. (2) Utility model registration claim 1, characterized in that the photosensitive sheet is made of a paper material that is locally curved by the pressure of the protruding member.
A film pack for the peel-apart film described in Section 1. (3) The peel-apart film according to claim 1, wherein the protrusion member protrudes toward the film unit presser plate from the plane of the photosensitive sheet that is positioned in close contact with the exposure aperture. Film pack.