JP2000089354A - Light shielding cover for instant film pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightproof cover for an instant film pack which lessen discharge resistance and reduces the consumption of a battery for driving a discharge mechanism. SOLUTION: The lightproof cover 13 is for shading of the exposure opening of the film pack and is discharged to the outside of a camera form the discharge port of the film pack after loading into the camera. The top end of the lightproof cover 13 is provided with a freely elastic temple part 32 to be crushed by a developing roller and an auxiliary rib 45 erected around a rounded part projecting to the side reverse therefrom in order to prevent next layer film units from being carried out together at the time of this discharging. The successive intrusion of the film units of the next layers into the slit width of the discharge port 20 is prevented by their thicknesses.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light shielding cover for an instant film pack which is displaced in a thickness direction and discharged while receiving a resistance.

[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. This film pack is, as described in, for example, JP-A-7-209814, a rectangular, mono-sheet type self-developing processing type in a box-shaped hard plastic light-shielding container (hard case). There is a type in which a plurality of film units (hereinafter, referred to as film units) are stacked and stored.

This film unit has an exposure section, a developing solution pod, and a trap section. The exposure section is composed of a photosensitive layer serving as an exposure surface, a white diffuse reflection layer, and an image receiving layer serving as a back surface. The developing solution pod is provided on the discharge side with respect to the exposure unit, and the developing solution is sealed. When the developing solution is developed between the photosensitive layer and the image receiving layer, the latent image recorded on the photosensitive layer is transferred to the image receiving layer as a positive image through the diffuse reflection layer. The image transferred to the image receiving layer is observed as a positive image from the surface opposite to the exposure surface. The trap section is provided on the side opposite to the discharge direction with respect to the exposure section, and captures and hardens excess developing solution developed between the photosensitive layer and the image receiving layer from the developing solution pod.

[0004] The film pack is provided with an exposure opening for allowing subject light to enter the exposure section of the film unit when the film pack is loaded in the camera. This exposure aperture is
Usually, light is shielded by a light-shielding cover placed on the uppermost layer of the film unit. The light-shielding cover is discharged from a discharge port provided on a surface orthogonal to a surface provided with an exposure opening by a first scraping operation of the claw member on the camera side.

After the upper end of the light-shielding cover discharged from the film pack is fed between a pair of developing rollers disposed inside the camera, the light-shielding cover is rotated from the developing roller through an outlet provided on the upper surface of the camera. It is discharged outside.
When the light-shielding cover is discharged, the uppermost film unit is set in the exposure opening.

[0006] The film unit is scraped out by a scraping operation of the claw member for each photographing. The scraped-out film unit is similarly nipped by the developing roller and sent toward the take-out port. At that time, the developing solution is spread on the exposure surface of the film unit by the developing roller, and the developing process is performed. Then, the film unit of the next layer is pushed up to the uppermost layer and set in the exposure opening.

Focusing on the fact that when the film unit is displaced in the thickness direction at the time of development and the passage of the developing solution is compressed in the thickness direction, the developability of the developing solution is improved, the film unit is displaced in the thickness direction. There is a demand for a camera having a structure for discharging while discharging. It is considered that the structure of this camera is to provide a spreading control member between the discharge port of the film pack and the developing roller, and to incline the passage between the developing roller and the outlet.

The spread control member is preferably arranged so as to press the developing solution pod of the film unit discharged from the discharge port of the film pack from the back surface side. The passage between the developing roller and the outlet is preferably inclined so that the exposure surface side of the film unit is wound around the developing roller on the exposure opening side.

[0009]

In the camera described above,
In any case, the light shielding cover is discharged while being displaced in the thickness direction. Therefore, since the light-shielding cover does not bend when the thickness is large, a large load is applied to the drive for driving the developing roller of the camera, and there is a problem that the consumption of the driving battery is increased. Therefore, when the thickness of the light-shielding cover is reduced,
It is elastic and can be easily deformed in the thickness direction to reduce the load applied when it passes through the developing roller.On the other hand, when the light-shielding cover passes through the film pack outlet, there is a large gap between it and the outlet. As a result, the film unit of the next layer may be discharged together with the light-shielding cover, and the film unit may be taken out.

The film pack is formed with a notch having an L-shaped cross section from the bottom surface to the surface on which the exposure opening is formed so that the claw member can enter and exit. Conventionally, in order to shield the notch from light, a black light-shielding film is attached to the lower end of the light-shielding cover so that a part thereof protrudes downward from the lower end of the light-shielding cover, and the bottom of the notch is shielded at the protruding portion. Was. However, when the light-shielding cover is made thin, the light-shielding cover is easily deformed in the thickness direction. When the film is deformed in the thickness direction, a gap is generated between the inner wall of the side surface of the film pack and the end of the light-shielding cover in the width direction (direction perpendicular to the discharge direction). Since the notch is formed near the end in the width direction of the film pack, when the above-described gap occurs, external light may enter from the end of the notch and the exposure surface of the film unit may be exposed.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above circumstances, and has as its object to provide a light-shielding cover for an instant film pack which prevents the film unit from being taken out due to a reduction in the thickness of the light-shielding cover. Also,
A second object is to provide a light-shielding cover for an instant film pack, which prevents light-shielding failure of a notch caused by thinning.

[0012]

In order to achieve the above-mentioned object, in the light-shielding cover for an instant film pack according to the present invention, after the film pack is loaded into the camera, the film is discharged from the discharge port by a scraping operation of the claw member on the camera side. When the film unit of the next layer is ejected together, the film unit is provided with a dimple portion provided with the concave surface facing the exposure opening side. And a rib protruding along the discharge direction on a rounded portion protruding from the opposite surface of the dimple portion.

According to the second aspect of the invention, the thickness of the dimple portion and the rib is longer than the slit width of the discharge port. According to the third aspect of the present invention, there is provided a light-shielding film for shielding a notch for a claw member from entering,
A skirt portion is provided which protrudes outside from one end in the width direction of the light-shielding cover, and whose protruding portion is bent toward the side opposite to the exposure opening inside the film pack.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 2 showing the structure of a film pack according to the present invention, a film pack 10 has a light shielding cover 1 in a case composed of a case body 11 and a lid 12.
3, a plurality of film units 14, and a light shielding sheet 1
5 is stored.

The case body 11 is formed of a plastic material, and has an exposure opening 18 formed on the front surface thereof for exposing subject light to the film unit 14. The exposure opening 18 is provided with a notch 19 into which a well-known claw member enters. Further, a slit-shaped outlet 20 for discharging the exposed film unit 14 is formed on the upper surface of the case body 11. This outlet 2
0, the light shielding cover 13 in addition to the film unit 14
Is also discharged. The outlet 20 is provided with a soft light-shielding seal 2.
1 is closed from the outside. The light-shielding seal 21 is attached to only one edge of the long side of the discharge port 20 so as not to hinder the discharge of the light-shielding cover 13 and the film unit 14. The light-shielding cover 13 is overlaid on the film unit 14 set first in the exposure opening 18, and covers the exposure opening 18.

The film unit 14 includes an exposure unit 14a,
It has a developing solution pod 14b and a trap portion 14c. The exposure unit 14a includes a photosensitive layer serving as an exposure surface, a white diffuse reflection layer, and an image receiving layer serving as a back surface. The developing solution pod 14b is provided on the discharge direction side with respect to the exposure unit 14a, and is filled with the developing solution. When the developing solution is developed between the photosensitive layer and the image receiving layer, the latent image recorded on the photosensitive layer is transferred to the image receiving layer as a positive image through the diffuse reflection layer. The image transferred to the image receiving layer is observed as a positive image from the surface opposite to the exposed portion 14a. The trap portion 14c is provided on the side opposite to the discharge direction with respect to the exposure portion 14a, and captures and hardens excess developing solution developed between the photosensitive layer and the image receiving layer from the developing solution pod 14b. The thickness of the exposed portion 14a is smaller than that of the developer pod 14b and the trap portion 14c.
The film unit 14 is a mono-sheet type having a vertically-long rectangular shape which can be handled as one sheet until the end, and in the present embodiment, is discharged along a long side (up and down) direction.

The lid 12 is also made of a plastic material. The cover 12 is provided with two holes 12a and 12b and two unit support protrusions 12c and 12d, and is attached to the case body 11 so as to face the exposure opening 18. The two holes 12 a and 12 b are provided at predetermined intervals above and below the lid 12, and serve as entrances when a push-up member provided on the camera side enters the inside of the pack 10 when loaded into the camera.

The unit supporting projections 12c and 12d are
2 are provided on both side ends in a vertically long shape, and have a shape protruding in an arc shape toward the exposure opening 18. These unit support projections 12c and 12d are in contact with the back surface of the lowermost film unit 14, and push up the film unit 14 in an arc shape having a central portion protruding toward the exposure opening 18 to prevent careless handling. When the light-shielding cover 13 is pushed from the outside toward the lid 12 through the exposure opening 18, the gap generated between the exposure opening 18 and the light-shielding cover 13 is narrowed, and the film unit 14 is moved by the external light entering from the gap. Exposure is prevented beforehand.

The light-shielding sheet 15 is composed of two sheets 23 and 24 made of elastic plastic. One sheet 23 has a central portion attached to the lid 12, shields the two holes 12a, 12b of the lid 12 before being loaded into the camera, and has cutout portions 23a, 23b at both ends of the center. After the loading, the upper and lower ends are elastically bent toward the exposure opening 18 between the unit supporting projections 12c and 12d at both ends by pushing up the pushing member on the camera side, and the film unit 14 is exposed through the other sheet 24. Push up to 18. These sheets 23 and 24 are exposed by the push-up member on the camera side, and are exposed to the exposure unit 1.
4a, the developing solution pod 14b and the trap portion 1
The upper and lower ends are bent toward the exposure opening 18 in order to push behind the 4c side.

The other sheet 24 has its lower end attached to the lower end 23c (indicated by hatching) of one sheet 23 to prevent the one sheet 23 from loosening and to prevent light from leaking from the holes 12a and 12b. And when the one sheet 23 is elastically bent by the push-up member on the camera side, the film unit 14 is pushed up substantially in a plane.

The light-shielding cover 13 is made of a plastic material and has a small thickness and is made of a polystyrene material containing carbon black in order to obtain high flexibility. When the concentration of carbon black increases, the strength becomes insufficient, and when the concentration of carbon black decreases, the light-shielding properties become insufficient. In addition, when the thickness of the light-shielding cover 13 increases, the flexibility becomes insufficient, and when the thickness decreases, molding defects easily occur. Therefore, in consideration of strength, light-shielding property, flexibility, moldability, and the like, the thickness of the light-shielding cover 13 is set to 0.3 to 0.45 m.
m, and the amount of carbon black added is 0.5 to
The range was 1.1%.

As shown in FIG. 3, a dimple portion 3 is provided on a front surface 30 (a surface exposed to the exposure opening) of the light shielding cover 13.
1, 32 and light-shielding ribs 33 to 36 are integrally formed. The two dimple portions 31 and 32 are each formed in a concave shape at both ends on the upper side (the end in the discharge direction).
The light-blocking ribs 33 to 36 are constituted by four ribs formed to extend in a narrow band along the discharge direction. Two of the ribs 33 and 34 are formed at one end in the width direction of the light shielding cover 13 and are separated by a predetermined distance. The other two ribs 34 and 35 are formed at the other end in the width direction of the light shielding cover 13 and are separated by a predetermined distance.

As shown in FIG. 4, each of the two ribs 33 to 36 is formed in a groove 37 formed on one inner wall of one edge of the exposure opening 18 in the width direction of one of the pair of ribs 33, 34. The rib 34 enters the vicinity of one edge of the inside of the exposure opening 18 and forms a labyrinth structure together with the groove 37. On the opposite side of the exposure opening 18, a rib 36 is formed at the other edge of the exposure opening 18 in the width direction. Enters the groove 38 formed in the inner wall,
Since the rib 35 is located near one edge of the inside of the exposure opening 18 and forms a labyrinth structure together with the groove 38, when the light shielding cover 13 is deformed in the thickness direction, the exposure opening 18 is formed.
To prevent external light from entering the inside from the gap.

On the back surface 40 of the light shielding cover 13, as shown in FIG.
Rounded portions 41 and 42 projecting along the concave surface are provided. The main ribs 43, 44 are provided on the rounded portions 41, 42.
And the auxiliary ribs 45 and 46 are integrally formed. As shown in FIG. 6, the dimple portions 31 and 32 are formed to have a thickness substantially equal to or smaller than that of the light shielding cover 13. The auxiliary ribs 45 and 46 are formed on the vertices of the rounded portions 41 and 42 in a narrow band shape along the discharge direction.
The tip is located near the upper end of the light-shielding cover 13, and the lower end has a length up to a position beyond the base of the round portions 41 and 42. The main ribs 43 and 44 are rounded portions 41 and 4
2 is formed in a narrow band shape along the discharging direction on the base shifted inward from the top, the length of which is lower at the tip than the auxiliary ribs 45 and 46, and the lower end is the auxiliary rib 4 at the lower end.
It is a length up to a position longer than 5,46. The heights of the auxiliary ribs 45 and 46 and the main ribs 43 and 44 are substantially the same, and the height of the auxiliary ribs 45 and 46 is greater than that of the auxiliary ribs 45 and 46 due to the difference in height at the positions provided on the rounded portions 41 and 42. Is getting higher.

As shown in FIG. 1 and FIG.
The length A of the thickness from the surface 30 of the base 3 to the top of the auxiliary ribs 45 and 46 is longer than the length of the reference slit width B of the outlet 20. Thereby, the dimple portions 31 and 32
The auxiliary ribs 45 and 46 constitute a means for reducing the thickness of the light-shielding cover 13 to prevent the film unit 14 on the next layer from being taken out when the light-shielding cover 13 is discharged. . In addition, by forming the dimple portions 31 and 32 in the film unit take-out prevention means, when the film unit is taken out by the deployment roller on the camera side, as compared with a case where the film unit take-out prevention means is constituted only by ribs, for example. The load on the drive mechanism for the developing roller can be reduced by the amount by which the dimple portions 31 and 32 are crushed.

The outlet 20 has a slit width slightly larger than the thickness of the developing solution pod 14b. This slit width is a reference slit width. In the present embodiment, the portions 50 and 51 through which the auxiliary ribs 45 and 46 pass are slightly wider than the reference slit width B on the side of the lid 12 so that the light-shielding cover 13 is smoothly discharged, and the central portion 52 is formed.
Of the light-shielding cover 13 and the film unit 14 in the width direction by pressing the both ends of the unit support members 12c and 12d toward the cover 12 by pressing the both ends of the unit support members 12c and 12d. Even if it is warped in the shape of a convex arc, these discharges can be performed smoothly.

The portions 50, through which the auxiliary ribs 45, 46 pass,
Portions 53 and 54 between the central portion 51 and the central portion 52 have a reference slit width B in this embodiment. This part 53,5
Reference numeral 4 corresponds to a range through which the main ribs 43 and 44 of the light shielding cover 13 pass. The thickness from the surface 30 of the light-shielding cover 13 to the apexes of the main ribs 43 and 44 is slightly shorter than the reference slit width B. These main ribs 43 and 44 and auxiliary ribs 4 on both outer sides thereof are provided.
5 and 46, the height is stepped when viewed from the side of the discharge port 20, and the frontage shape of the discharge port 20 facing these is also stepped. Furthermore, these are the film unit 1
4 are located at both ends in the width direction,
The film unit 14 can be more securely prevented from being taken out as compared with the case where the film unit taking out prevention means is constituted only by the dimple portions 31 and 32 and the auxiliary ribs 45 and 46.

On the back surface 40 of the light-shielding cover 13, a lower end 55 (see FIG. 5) with which a claw member on the camera side is engaged is provided.
A strip-shaped light-shielding film 56 is attached. The light-shielding film 56 sticks out a part 57 from the lower end of the light-shielding cover 13, bends the part 57 that is sticking out in an L-shape toward the lid 12, and shields the bottom side of the notch 19 from light. When the light-shielding film 56 is elastically deformed in the thickness direction, a gap is formed at both ends in the width direction, and the light-shielding film 56 is provided to prevent external light from entering the inside through the gap from the notch 19. A skirt portion 58 protruding from one end of the width direction 13 in a narrow width is provided, and the skirt portion 58 is folded in an L shape toward the lid 12 side.
The skirt portion 58 is provided so as to extend to a part 57 folded back into an L shape, and a cut 59 is provided at a bending boundary of the part 57 so that the skirt part 58 can be easily folded. The portion 60 of the outlet 20 through which the skirt portion 58 passes is wider than the reference slit width B, as shown in FIG.

As shown in FIG. 10, a pair of developing rollers 6
Reference numerals 5 and 66 are arranged above the film pack storage chamber inside the camera. The developing roller 65 is arranged such that the discharge port 20 of the film pack 10 is located on the tangent line, and the driving force of the driving motor is transmitted to the shaft, and the developing roller 65 is rotated at a fixed position. The pair of developing rollers 65 and 66
They are arranged at a predetermined interval by a spacer (not shown). The unfolding roller 66 is connected to the film unit 14.
And is urged toward the spacer by a spring 67. A pair of developing rollers 6
The spacer interval of 5, 66 is the developing solution pod 14b.
Of the auxiliary ribs 4 from the thickness of the
It is narrower than the thickness A to the top of 5,46.

In the film unit 14, the developing solution is pushed out and developed from the developing solution pod 14b when passing between the developing rollers 65 and 66. At that time, the flow of the developing solution is reduced. If controlled, the developing solution can be evenly distributed over the entire screen. Therefore, focusing on the fact that the flow of the developing solution can be controlled by compressing the passage of the developing solution by displacing the film unit 14 in the thickness direction at the time of development, the gap between the discharge port 20 and the developing rollers 65 and 66 is focused. A squeeze guide 68 that obstructs the tangential line is provided to form a passage for discharging the film unit 14 while displacing the film unit 14 in the thickness direction.

Next, the operation of the above configuration will be described. As shown in FIG. 11, when the film pack 10 is not used, the exposure opening 18 is a light shielding cover 13, the discharge opening 20 is a light shielding seal 21, and the holes 12a and 12b are
Further, the notches 19 are each closed with a light-shielding film 56, and the inside is shielded from light. Further, the unit support projections 12 are provided at both ends of the rear surface of the lowermost film unit 14.
c and 12d are in contact. The film unit 14
Since the exposed portion 14a is thinner than the developing solution pod 14b and the trap portion 14c, several film units 14 on the lowermost layer side are centered by the contact of the arc-shaped unit support protrusions 12c and 12d. It is in a state of being curved in an arc shape convex toward the exposure opening 18.

When the film pack 10 is loaded into the film loading chamber of the camera, as shown in FIG.
The push-up members 70 and 71 on the camera side enter from 2b and push up the sheet 23 toward the exposure opening 18. As a result, the sheets 23 and 24 are pressed behind the lowermost film unit 14, and are in a state in which the sheets 23 and 24 are warped in an arc shape having a central portion protruding toward the exposure opening 18.

After the film pack 10 has been loaded into the film loading chamber of the camera, when the shutter release is performed in preparation for photographing, the claw member 72 enters the notch 19 as shown in FIG. Engage the corner,
The subsequent movement of the claw member 72 in the direction of the arrow shown in FIG.
It is discharged toward zero. At this time, the dimple portion 31,
32 and the thickness of the auxiliary ribs 45 and 46, the developing solution pod 14b of the next layer film unit 14
Since it is hidden when viewed from above, even if it is taken out together, it comes into contact with the edge of the discharge port 20 and is prevented from being taken out. When the upper end of the light-shielding cover 13 pushes up the light-shielding seal 21 and is discharged for a predetermined length from the outlet 20, the claw member 72 moves to the trap portion 14 c of the film unit 14 of the next layer.
And the trap portion 14c abuts against the inner wall of the surface on which the exposure opening 18 is formed by pushing up the push-up members 70, 71, and is pressed there. Therefore, the dimple portions 31, 32, and the auxiliary rib 45 , 46 have passed through the outlet 20, there is no possibility that the film unit 14 will be taken out.

The discharged light-shielding cover 13 comes into contact with the leading end of the sword guide 68 and gently curves toward the developing roller 65 while rubbing the surface on the side opposite to the exposure opening 18 against the leading end. Can be When the tip of the light shielding cover 13 contacts the outer peripheral surface of the developing roller 65,
Are gradually curved to the opposite side toward the developing roller 66 according to the rotation of the developing roller 65, and
Sent during

The light shielding cover 13 sent to the developing rollers 65 and 66 is sent while the pair of dimples 31 and 32 at the tip are crushed to a thickness corresponding to the interval between the developing rollers 65 and 66. Thus, the inclined passage 75 is displaced in the thickness direction with the sword guide 68 as a fulcrum.
Is discharged. The light-shielding cover 13 that has passed through the inclined passage 75 is discharged to the outside through the outlet 76 of the camera while being deformed so as to be wound around the outer periphery of the developing roller 65 more. At this time, the skirt portion 58 of the light-shielding film 56 is bent in an L-shape from the light-shielding cover 13 to one side in the width direction, but passes through the wide slit width 60 provided in the discharge port 20, so that the skirt portion 58 is not caught smoothly. Can be discharged. As a result, the next film unit 14 is set in the exposure opening 20 and the preparation for photographing is completed.

The light-shielding cover 13 is displaced in the thickness direction in an arc shape by the sword guide 68 and the inclined passage 75, so that a repulsive force is generated, which becomes a resistance at the time of discharge. Since the cover 13 is thinner than the conventional one, the repulsion is small and the resistance is small. In addition, since the dimple portions 31 and 32 constituting the film unit take-out preventing means are crushed, the unfolding rollers 65 and 6
Even when the driving torque of the motor for rotating the motor 6 is small, the light shielding cover 13 can be reliably discharged. Therefore, the consumption of the battery for driving the motor for rotating the developing rollers 65 and 66 is reduced as compared with the related art.

For photographing, a shutter release is performed. After the completion of the exposure, the developing rollers 65 and 66 start rotating almost simultaneously with the scraping operation of the claw member 72. Claw member 72
The upper end of the exposed film unit 14
When the film unit 14 is fed by a predetermined length, it comes into contact with the tip of the sword guide 68, and the tip is ejected while being inclined toward the developing roller 65, so that the film unit 14 rubs the anti-exposure surface against the tip of the sword guide 68, It is sent to the developing roller 65 while gently curving. When the leading end of the film unit 14 comes into contact with the outer peripheral surface of the developing roller 65, the film unit 14 is gently curved toward the developing roller 66 in accordance with the rotation of the developing roller 65, and is interposed between the developing rollers 65, 66. Sent. Film unit 14
Is displaced in the thickness direction in an arcuate shape with the sword guide 68 as a fulcrum, and is discharged from the camera outlet 76 to the outside while being wound around the outer periphery of the developing roller 65 corresponding to the exposure surface side by the inclined passage 75. Therefore, the expandability becomes good.

While passing between the developing rollers 65 and 66, the developing solution pod 14b is pressurized by the developing roller 66, and the developing solution is pushed out therefrom. The film unit 14 is displaced in the thickness direction in an arc shape. Therefore, the passage of the developing solution is compressed, and can be developed while controlling the flow rate of the developing solution. Excess developing solution is supplied to the trap section 14.
c is caught and cured. The developing rollers 65, 66
While the film unit 14 is sandwiched between them, a constant tension is applied to the film unit 14,
The film unit 14 is fed stably. Since the sword guide 68 comes into contact with the anti-exposure surface of the film unit 14, the quality is not deteriorated.

[0039]

Next, the results of an experiment on the internal light-shielding property of the film pack 10 were performed by changing the conditions for attaching the light-shielding film 56 and the presence or absence of the skirt portion 58.
Shown in

[0040]

[Table 1]

In the judgment, the presence or absence of fog on the film unit 14 stored in the film pack 10 was examined. Under the conditions 1 and 2, since the light-shielding film 56 is stuck on the surface 30 of the light-shielding cover 13, a part of the light-shielding film 56 is stuck on the light-shielding rib 33. There was something to do. In condition 3, a part of the film unit 14 corresponding to the notch 19 is
Fog of about mm was recognized. From this result, it was found that the surface to which the light-shielding film 56 was attached did not hinder either the front surface 30 or the back surface 40 as long as there were no irregularities such as ribs. In addition, it was found that fogging occurs when the skirt portion 58 is not provided.

[0042]

As described above, the light-shielding cover for an instant film pack according to the present invention is provided with the dimple portion, so that the dimple can be formed even when the ribs and the dimple portion are added when expanded by the developing roller on the camera side. The portion is not crushed and a load is not applied to the mechanism for driving the developing roller. Therefore, the driving torque of the driving mechanism for the developing roller can be reduced, and accordingly, the cost of the driving mechanism on the camera side can be reduced. it can. According to the second aspect of the present invention, since the thickness of the dimple portion and the rib is longer than the slit width of the outlet, the film unit of the next layer is hidden when viewed from the outlet. It is possible to reliably prevent the film unit from being taken out. According to the third aspect of the present invention, since the skirt portion protruding from one end in the width direction of the light-shielding cover is provided on the light-shielding film, the notch can be reliably shielded from light even if the light-shielding cover is deformed in the thickness direction.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a light shielding cover and a film pack of the present invention.

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

FIG. 3 is a perspective view of the light-shielding cover as viewed from the surface.

FIG. 4 is a cross-sectional view of a film pack showing a structure in which a light-shielding rib of a light-shielding cover shields an exposure opening.

FIG. 5 is a perspective view of the light-shielding cover as viewed from the back.

FIG. 6 is a longitudinal sectional view of a light shielding cover showing a dimple portion.

FIG. 7 is a longitudinal sectional view of a light shielding cover showing an auxiliary rib.

FIG. 8 is a cross-sectional view of the film pack showing a relationship between a light-shielding cover and a discharge port.

FIG. 9 is a cross-sectional view of the film pack showing the relationship between the light-shielding film and the discharge port.

FIG. 10 is a longitudinal sectional view showing the film pack when the light shielding cover is discharged.

FIG. 11 is a longitudinal sectional view showing the film pack in an unused state.

FIG. 12 is a longitudinal sectional view showing the film pack after being loaded into the camera.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Film pack 13 Light shielding cover 20 Outlet 31, 32 Dimple part 33-36 Light shielding rib 43, 44 Main rib 45, 46 Auxiliary rib 56 Light shielding film 58 Skirt

Claims (3)

[Claims] 1. An instant film pack having an exposure opening for giving exposure to a film unit stacked and housed therein, and a slit-shaped outlet formed on a surface orthogonal to the exposure opening. Usually, the exposure opening is closed light-tightly, and after the film pack is loaded into the camera, the film is discharged from the discharge port by the scraping operation of the claw member on the camera side and discharged from the discharge port. In a light-shielding cover for an instant film pack provided with a film unit take-out preventing means for preventing the film unit of the next layer from being discharged at the same time, the film unit take-out preventing means has a concave surface facing the exposure opening side. The dimples that are formed to face each other and the rounded parts that protrude from the opposite surface of the dimples Shielding cover for instant film pack, characterized in that it is composed of a erected ribs. 2. The light-shielding cover for an instant film pack according to claim 1, wherein the dimple portion and the rib have a thickness longer than a slit width of a discharge port. 3. A light-shielding film for shielding a notch formed at one end in a width direction at a bottom surface of the film pack so that the claw member enters the inside of the precursor film pack. In the light-shielding cover for an instant film pack, the light-shielding film protrudes from one end in the width direction of the light-shielding cover, and a protruding portion inside the film pack is bent toward the side opposite to the exposure opening. 3. The light-shielding cover for an instant film pack according to claim 1, wherein a skirt portion is provided.