JP2001255630A - Photographic roll film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photographic roll film which can be surely sealed with simple structure after it is exposed. SOLUTION: In the case of sealing the photographic roll film 10 in a lighttight state, a bending piece 13b is folded and superposed on a base part 13a so as to enhance the stiffness of the most trailing end 13A. Then, the end 13A is inserted in a 2nd slit 21 from a 1st slit 20 and pulled out to the outside of a light shielding trailer 13. Since the stiffness of the end 13A is enhanced, the end 13A is surely fit in the slits 20 and 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographic roll film capable of sealing a photographed photographic roll film in a sanitary, simple and reliable manner.

[0002]

2. Description of the Related Art Photographic roll films are obtained by winding a band-shaped photo film having a width of about 6 cm around a spool and tape-fixing the leading end of a light-shielding paper. 120 type and 220 type brownie films are known. The 120-type roll film covers the entire base surface of the photographic film with light-shielding paper longer than the photographic film, so that the photographic film can be stored in a light-tight manner. On the other hand, 220
A type of roll film stores light tightly by joining light-shielding paper called a light-shielding leader and light-shielding trailer to both ends of the photo film instead of omitting the light-shielding paper covering the entire base surface of the photo film. The length of the photographic film is about twice as long as that of the 120 type roll film.

When the photographic roll film is set in the film loading chamber of the camera and the photographing is advanced, the photographic film is wound on a spool previously mounted in the film winding chamber of the camera. When the winding operation is further performed after the end of the entire photographing, the rear end of the light-shielding paper is detached from the spool in the film loading chamber, and the entire photo film and the light-shielding paper are wound on the spool in the film winding chamber.

The photographic roll film thus photographed is removed from the camera together with the spool.
Light-tightly sealed and sent to a development facility. As for sealing the photographic roll film in a light-tight manner, a sealing tape coated with an adhesive activated by rewetting is provided at the rear end of the roll film, and the sealing tape adhesive is used. There is a problem that it is not preferable for hygiene because it is licked and sealed.

To solve this problem, Japanese Utility Model Laid-Open No. 5-47944 proposes a method in which a release tape is provided on a sealing tape, and the release paper is peeled off at the time of use. Further, Japanese Patent Application Laid-Open No. H11-7104 proposes a self-adhesive type adhesive patch provided on the front and back surfaces of a light-shielding paper for sealing.

However, the one disclosed in Japanese Utility Model Laid-Open Publication No. Hei 5-47944 has a drawback that when the release paper is peeled off in the camera, contamination by the adhesive occurs.
Further, the one disclosed in Japanese Patent Application Laid-Open No. 11-7104 has a drawback that if the installation position of the adhesive patch is shifted, the roll film cannot be sealed, so that the winding becomes loose.

In order to solve such a problem, a slit is formed in the light-shielding paper on the rear end side of the photographic roll film, and the final end of the light-shielding paper is fitted into the slit, thereby achieving a simple structure. A photo roll film for sealing a photo roll film in a light-tight manner has been proposed.

[0008]

However, the photographic roll film in which the last end of the light-shielding paper fits into the slit has the disadvantage that the final end is hard to fit in the slit because the light-shielding paper is thin and weak. there were. Such a problem can be solved by attaching a reinforcing sheet to the final end, but there is a drawback that the number of components increases because the reinforcing sheet is required.

The present invention has been made in view of such circumstances, and has as its object to provide a photographic roll film capable of securely sealing a photographed photographic roll film with a simple structure.

[0010]

In order to achieve the above object, the present invention provides a strip-shaped photographic film, light-shielding paper provided at a front end and a rear end of the photographic film, The light-shielding paper is wound around the outer periphery of the photo film when not in use. In a photographic roll film that winds and shields a light-shielding paper on the rear end side, a slit is formed in the light-shielding paper on the rear end side, and a final end of the light-shielding paper on the rear end side can be inserted into the slit. It is formed so as to be foldable along a fold line formed in a direction orthogonal to the direction of insertion into the slit, and an inclined cut is formed at both edges sandwiching the fold line. Is formed It is characterized in.

According to the first aspect of the present invention, when the photographic roll film is light-tightly sealed, after folding the final end of the light-shielding paper on the rear end side along the folding line, the folding is performed. Insert the final end into the slit. As described above, in the present invention, since the final end portion is reinforced by folding the final end portion, the final end portion can be securely fitted into the slit without attaching a reinforcing sheet to the final end portion. Therefore, the photographed photo film can be securely sealed with a simple structure.

According to the second aspect of the present invention, the final end portion is formed in a sawtooth shape, and when inserting the sawtooth-like projection into the slit, the inclined edges of the projection abut on both side edges of the slit. As a result, the final end is smoothly inserted into the slit. On the other hand, when a force in the pull-out direction is applied to the final end portion that has passed through the slit, the edges of the protrusions formed in a direction orthogonal to the pull-out direction are caught on both side edges of the slit, so that a large resistance is generated in the pull-out direction. appear. As a result, the light-shielding paper is prevented from being loosened, and the photographic roll film is light-tightly sealed.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The photographic roll film of the present invention will be described below using a 220 type photographic roll film.

FIG. 1 is a developed view of a photographic roll film 10 according to an embodiment.
Is composed of a photographic film 11, a light-shielding leader (light-shielding paper at the front end) 12, a light-shielding trailer (light-shielding paper at the rear end) 13, and a spool 14 (see FIG. 2). At both ends of the photographic film 11 shown in FIG.
16 are joined. On the surface of the joining tape 15, a bar code representing film information such as the type of the photo film 11 and ISO film sensitivity is printed. This bar code is used when the photo roll film 10 is loaded in the camera. Is read by a bar code reader.

The free end 12A of the light-shielding reader 12 and the free end (hereinafter referred to as "final end") 1 of the light-shielding trailer 13
3A is formed to have a small width to be inserted into a slit (not shown) formed in the shaft portion of the spool 14 in FIG. 2, and is locked by a locking claw provided in the slit. Department.

The final end 13A of the light-shield trailer 13 shown in FIG.
Is formed to be longer than the free end 12A of the light-shielding reader 12, and a mountain fold line 23 is formed at a substantially central portion in the longitudinal direction so as to be orthogonal to the longitudinal direction. The final end portion 13A is divided into a base portion 13a and a bent piece 13b with the mountain fold line 23 interposed therebetween. Thereby, when the bent piece 13b is folded along the mountain fold line 23, the bent piece 13b is
a. Further, inclined cuts 13c, 13c,... Are formed at the edges on both sides of the mountain fold line 23. Thus, when the bent piece 13b is folded on the base 13a, both side corners of the distal end of the base 13a are tapered so that the base 13a can be easily inserted into slits 20, 21 described later.

On the other hand, a plurality of projections 22, 22 formed in a sawtooth shape are integrally formed on both side edges of the base portion 13a, and these projections 22, 22,.
1 is engaged.

When the photographic roll film 10 is manufactured, the final end 13A of the light-shielding trailer 13 is
3a and the bent piece 13b are folded, inserted into the slit of the spool 14, and locked. Then, spool 1
4 in the winding direction, the light-shielding trailer 1 is rotated.
3. The photo film 11 and the light shielding reader 12 are wound around the spool 14 in this order. The light-shielding reader 12 wound last has a function of covering the outer periphery of the photographic film 11 and shielding light, and is used for sealing to prevent light fogging of the photographic film 11 due to loosening of the light-shielding reader 12. Sealed with tape 17.

Next, a method of using the photographic roll film 10 will be described.
First, the sealing tape 17 is peeled off, and then set in the film chamber of the camera. The free end 12A, which is the locking portion of the light-shielding reader 12, is locked by a slit of another spool 14 set in advance in the film winding chamber. Thereafter, when the camera back cover is closed and a film setting operation is performed, the spool 14 of the film take-up chamber is rotated, the light-shielding reader 12 is wound up, and the leading end of the photographic film 11 is set in the aperture of the camera. Each time a photograph is taken, the photo film 11 is placed on the spool 14 of the film take-up chamber.
When each frame is wound up and the photographing of the last frame of the photographic film 11 is completed, the light shielding trailer 13 is also wound up on the spool 14 of the film winding room. When the back cover of the camera is opened after the photographing is completed, the outer periphery of the photographic film 11 wound around the spool 14 of the film winding chamber is covered with the light shielding trailer 13 and is shielded from light.

The light shielding trailer 13 has a first slit 20 and a second slit 21 formed along the width direction. The width dimension L1 of these slits 20 and 21 is as shown in FIG.
The top 22A of the projection 22 formed on one edge of the base 13a shown in FIG.
Are slightly narrower than the dimension L2 of the line segment connecting.

When the photographic roll film 10 is light-tightly sealed, first, the bent piece 13b is folded over the base 13a to double the final end 13A, thereby strengthening the final end 13A. Next, the folded end 13A is shown in FIG.
As shown in (1), it is inserted into the second slit 21 from the first slit 20 and pulled out of the light shielding trailer 13. At this time,
Since the corner of the tip of the final end 13A is chamfered, the final end 13A is easily inserted into the slits 20 and 21. When the serrated projections 22, 22,... Enter the slits 20, 21, the inclined edges 22B of the projections 22 come into contact with both edges 20A, 20A, 21A, 21A of the slits 20, 21, so that the final end 13A. Smoothly enters the slits 20 and 21 without receiving much resistance from the edges 20A and 21A of the slits 20 and 21.

On the other hand, when a force in the detaching direction indicated by arrow A in FIG. 3 is applied to the final end 13A passing through the slits 20 and 21, the edge of the projection 22 formed in a direction orthogonal to the detaching direction is applied. Since the portion 22C is hooked on both side edges 20A and 21A of the slits 20 and 21, a large resistance is generated in the removal direction. As a result, the light-shielding trailer 13 is prevented from loosening, and the photographic roll film 10 is light-tightly sealed.

As described above, in the present embodiment, since the final end 13A is strengthened by folding the final end 13A, the final end 13A is slit without attaching a reinforcing sheet to the final end. 20 and 21 can be securely fitted. Therefore, the photographed photo roll film 10 can be securely sealed with a simple structure.

FIG. 4 shows that the light shielding trailer 13 has a slit 21.
Is shown in FIG. When the photographic roll film 10 is light-tightly sealed, the final end portion 13A obtained by folding the bent piece 13b on the base portion 13a is pushed into the light shielding paper 13 from the slit 21 and fitted therein. In the photographic roll film 10 in which only one slit 21 is thus formed, the final end 13A has the bent piece 13b folded over the base 13a and the stiffness is strengthened. Is inserted into.

As another sealing means, a folded holding sheet such as aluminum foil which is easily bent and deformed is attached to the final end 13A of the light-shielding trailer 13, and the final end 13A is inserted into the two slits 20 and 21. After the last end 1
3A may be folded back and sealed.

In this embodiment, the 220 type photographic roll film 10 is exemplified. However, the present invention can be applied to a 120 type photographic roll film.

[0027]

As described above, according to the photographic roll film according to the present invention, the final end of the light-shielding paper on the rear end side is folded and the final end is strengthened. The final end can be securely fitted into the slit without attaching a reinforcing sheet to the slit. Therefore, according to the present invention, it is possible to securely seal a photographed photo roll film with a simple structure.

[Brief description of the drawings]

FIG. 1 is a developed view showing a structure of a photographic roll film according to an embodiment.

FIG. 2 is a perspective view showing the appearance of a photo roll film after sealing.

FIG. 3 is an enlarged plan view of the final end of the light-shielding trailer.

FIG. 4 is a perspective view of a roll film for photography in which only one slit is formed.

[Explanation of symbols]

10 ... Photo roll film, 11 ... Photo film, 1
2 ... light shielding leader, 13 ... light shielding trailer, 13A ... final end, 13a ... base, 13b ... bent piece, 13c ... notch, 14 ... spool, 15, 16 ... joining tape, 17 ...
Sealing tape, 20, 21 ... slit, 22 ... projection, 2
3. Mountain fold line

Claims (2)

[Claims] 1. A belt-like photo film, a light-shielding paper provided at a front end and a rear end of the photo film, and a spool wound around the outer periphery from the light-shielding paper at the rear end. Sometimes, a light-shielding paper at the leading end is wrapped around the outer periphery of the photo film to shield light, and after the photographing is completed, a light-shielding paper at the rear end is wound around the outer periphery of the photo film wound up on another spool, thereby shielding the light. In the above, a slit is formed in the light-shielding paper on the rear end side, and a final end of the light-shielding paper on the rear end side is formed in a size that can be inserted into the slit, and in a direction to be inserted into the slit. A photographic roll film, which is formed so as to be foldable along a fold line formed in an orthogonal direction, and has inclined cuts formed at edges on both sides of the fold line. 2. The photographic roll film according to claim 1, wherein the last end of the light-shielding paper on the rear end side is formed in a saw-tooth shape.