JPH0469769B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a light shielding cover for a film pack used in an instant camera.

[Prior art]

A film pack consists of a rectangular pack body with an exposure opening formed on one side, a light shielding cover housed inside the film pack body, a plurality of film units arranged under the light shielding cover, and these. It consists of a light-shielding cover, a film unit, and a spring plate that pushes the film unit upward. When this film pack is loaded into an instant camera and the release button is pressed, the motor starts, the claw moves back and forth, and the unfolding roller rotates. This claw scrapes out the light-shielding cover stored at the top of the pack body to a position where it can be caught by the unfolding roller, and is then ejected from the pack body by the unfolding roller. When the light-shielding cover is ejected prior to photographing, the film unit immediately below it is pushed up to the top by the spring plate, allowing photographing to take place.

In the film unit, the processing liquid storage section is the thickest, and the thickness thereof is about 1.6 mm. In line with this, the height of the film outlet provided in the pack body is approximately 1.6 mm.
The thickness of the light blocking cover is also approximately 1.3mm.

The film unit and light-shielding cover housed inside the pack body are pushed upward by a spring plate placed at the bottom of the pack body, so when the light-shielding cover is left in, the pressing force of the spring plate is strongest. The pressing force becomes gradually weaker each time the light-shielding cover and film unit are ejected. Therefore, when ejecting the light shielding cover, the ejection force is the greatest, and the claw requires a large driving force.
In addition, since the developing roller is urged in the direction of approaching by a spring, if the light shielding cover is thick,
Since the gap between the pair of unfolding rollers becomes wider against the force of the spring, the unfolding rollers require a large amount of torque.
Furthermore, when the light-shielding cover was ejected, there were cases in which the film unit underneath remained stuck to the light-shielding cover and was ejected together with the light-shielding cover.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a light-shielding cover that reduces the ejection force of the light-shielding cover and prevents the film unit underneath from being ejected together with the light-shielding cover when the light-shielding cover is ejected. be.

[Structure of the invention]

In order to achieve the above object, the present invention is characterized in that a protrusion is formed on the lower surface or the upper surface of the tip of the light-shielding cover, or on both surfaces thereof.

〔Example〕

1 and 2, a rectangular pack body 10 has an exposure opening 11 formed on its upper surface. Furthermore, a film outlet 12 with a height of about 1.6 mm is formed at the front upper part of the pack body 10, and is closed with an opaque plastic film 14 until the light shielding cover 13 placed at the top is ejected. , are shielded from light so that no light enters into the pack body 10 from here. A notch 15 is formed at the rear of the pack body 10 into which a claw (not shown) enters, and the rear end of the light-shielding cover 13 or film unit 16 is scraped out and spread out by a developing roller (not shown). Let it bite.

As shown in FIG. 3, inside the pack body 10,
Light shielding cover 13 and multiple film units 16
are stored one on top of the other. A swollen processing liquid storage portion 16a is provided at the tip of the film unit 16, and when pressurized by a developing roller, the stored processing liquid is discharged and developed.

As shown in FIG. 4, the tip 13a of the light-shielding cover 13 has an arcuate shape and is pointed to make it easier to open the plastic film 14. As shown in FIG. Further, a plurality of, for example, three protrusions 13b are formed on the lower surface of the tip. This protrusion 1
3b is for preventing the film from getting caught on the film outlet 12 and for making it easier for the developing roller to catch the film.
The tip is beveled. In this embodiment, the thickness of the light-shielding cover 13 is approximately 0.8 mm, and the protrusion 1
The thickness of 3b is approximately 0.3 mm. On the other hand, the thickness of the film unit 16 (the thickness of the thickest part) is approximately
It is 1.6mm. In addition, the pack body 10 contains 10
Two film units 16 are housed therein, and are pressed upward by a spring plate 17 placed at the bottom of the pack body 10.

Next, the operation of the above embodiment will be explained. Load the film pack into the camera body (not shown) and press the release button (not shown).
When the motor rotates, the claw first enters the notch 15 and pushes the rear end of the light shielding cover 13. The tip 13a of this light-shielding cover 13 strongly presses against the light-shielding plastic film 14. In this case, since the tip of the light-shielding cover 13 is arcuate instead of straight as in the conventional case, only the most protruding central portion comes into contact with the plastic film 14. Therefore, the force applied from the claw is applied to the plastic film 14 only through this central portion.
, so instead of pushing it open all at once, it opens from the center and gradually moves to the periphery, so the pack body 10
The plastic film 14, which is partially bonded to the plastic film 14, can be easily pushed open. That is,
Even if the ejection force by the claw is weak, the plastic film 14 can be reliably pushed open.

When the plastic film 14 is pushed open, the film outlet 12 opens, and the light shielding cover 13 is ejected from there. This blackout cover 1
Since the three protrusions 13b are formed on the lower surface of the distal end of the paper, the paper does not curl or sway when the paper is discharged. In addition, since the tip is thickened by the protrusion 13b, even if the film unit 16 below is pinched, this film unit 16 will hit the film outlet 12, so that the film unit 16 will not be pinched when the light-shielding cover 13 is ejected. They are not discharged together. Furthermore, since the portion other than the protrusion 13b is thin, the light shielding cover 13 can be reliably ejected from the pack body 10 even with a weak ejection force.

In the embodiment, the protruding portion 13b is attached to the light shielding cover 1.
3, but it may be formed on the upper surface or even on both sides. Light shielding cover 1 coming out from this film exit 12
3 is caught by a developing roller (not shown) and discharged from the camera body. The light shielding cover 1
3 is ejected, the first film unit 16 is located at the top of the pack body 10, so pressing the release button opens the exposure opening 11.
The film unit 16 is exposed to the light passing through it, and immediately after that, the motor rotates and the light shielding cover 13 is exposed.
It is discharged from the pack main body 10 in the same manner as in the discharge procedure, and is subjected to development processing by being pressurized by a developing roller. A visible image is formed on the recording surface of the film unit 16 by this development process.

FIG. 5 shows another embodiment of the light shielding cover. This light shielding cover 20 has a tip 20a
is wedge-shaped, and the plastic film 1
4 can be pushed open more easily. Further, the protrusion 20b extends to the tip 20a.

FIG. 6 shows yet another embodiment of the light shielding cover. In this embodiment, the tip 22a of the light shielding cover 22 has an arcuate shape, and a wide protrusion 22b is formed on the lower surface of the tip.

〔Effect of the invention〕

In the present invention having the above configuration, a protrusion protruding in the thickness direction of the light shielding cover is formed on at least either the upper surface or the lower surface of the tip of the thin light shielding cover, so that the ejection force of the light shielding cover can be weakened. At the same time, it is possible to prevent the film unit from being ejected together with the light shielding cover.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the film pack before the light shielding cover is ejected. FIG. 2 is a perspective view of the film pack showing a state in which the light shielding cover is ejected. FIG. 3 is a partial cross-sectional view of the film pack. FIG. 4 is a plan view showing an embodiment of the light shielding cover of the present invention. Figures 5 and 6
The figures are plan views showing other embodiments of the light-shielding cover of the present invention. 10...Pack body, 12...Film exit,
13... Light shielding cover, 13a... Tip, 13b...
...Protrusion, 14...Plastic film, 16
...Film unit, 17...Spring plate, 20,
22... Light shielding cover, 20a, 20a... Tip,
20b, 20b... Protruding parts.

Claims (1)

[Scope of Claims] 1. In a film pack in which film units are stored in a stacked state in a pack main body, and an opaque light-shielding cover is disposed on the top of the film unit, the tip of the light-shielding cover has a thickness direction. 1. A light-shielding cover, characterized in that a protruding portion is formed to prevent the light-shielding cover and the film unit thereunder from being ejected from the outlet of the pack body while being overlapped. 2. Claim 1, characterized in that three emitting portions are arranged in the width direction of the light shielding cover.
Light-shielding cover as described in section. 3. The light-shielding cover according to claim 1, wherein the light-shielding cover has a thickness of 0.8 mm.