JP2672176B2 - Photo film patrone - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a photographic film cartridge in which the leading end of a film is fed by rotating a spool.

[Conventional technology]

U.S. Pat. No. 4,832,275, U.S. Pat. No. 4,834,306, etc. propose a photographic film cartridge in which the tip of the film can be sent out of the film cartridge main body by rotating the spool. In such a photo film cartridge, the film is not pulled out at all in the unused state.Therefore, when trying to shield the light from the film discharge port with the telemp as in the conventional case, the pile yarn is made to have a high density, and the hair is also fluffy. You have to use a long one.

Further, Japanese Patent Laid-Open No. 60-211453 discloses a light-shielding cassette that contains a light-sensitive material in a light-tight manner. In this light-shielding cassette, a plurality of pairs of flexible lips are provided around the exit hole of the photosensitive material so as to face each other, and these lips are pressed against each other to prevent light leakage from the exit hole.

Further, in Japanese Patent Laid-Open No. 63-124050, a light-shielding elastic plate is provided along the longitudinal direction of the exit slot of the photosensitive material, and the free end of this elastic plate is pressure-bonded to the other wall surface of the exit slot in the magazine. There is disclosed a configuration in which the light is blocked.

[Problems to be solved by the invention]

However, as described in the above-mentioned U.S. Patent Publication, in the case where the film discharge port is shielded from light by a teremp, the tip of the film is made to be particularly thin when the pile thread is made dense and the hair is long. A large load is applied to the tip of the film when it is sent out from the discharge port, which not only increases the axial torque of the spool, but also tends to cause jamming.

In the light-shielding cassette described in JP-A-60-211453, a gap is formed between the widthwise edge portion of the flexible lip and the inner wall of the outlet hole, and a sufficient light-shielding function cannot be obtained. Further, in the one disclosed in Japanese Patent Laid-Open No. 63-124050, a gap is likely to be formed between the edge portion in the width direction of the elastic plate and the inner wall of the magazine, and if the elastic plate creeps and is rolled up, it is sufficient. It becomes impossible to perform proper light shielding. When the photosensitive material that has been pulled out is rewound into the magazine, the elastic plate may be wound inside the magazine together with the photosensitive material. There is a problem in terms of reliability.

[Object of the invention]

The present invention has been made in order to solve the problems of the prior art as described above, and it is possible to obtain a sufficient light-shielding function even when it is rewound and used, with less resistance when feeding the leading end of the film. The purpose is to provide a photo film patrone.

[Means for solving the problem]

In order to achieve the above-mentioned object, the photographic film cartridge of the present invention is such that one long side is fixed along one side in the longitudinal direction of the slit for discharging the film, and the other long side becomes a free end, and its own elasticity. And a receiving surface that receives the other long side of the light shielding piece and that prevents the light shielding piece from entering the inside of the slit.

Further, the other long side of the light shielding piece is pressed by the biasing means and pressed against the receiving surface, whereby the light shielding of the film feeding slit can be ensured.

[Action]

Since the light-shielding piece covers the slit for discharging the film, there is almost no gap between the slit and the light-shielding piece, and the long side of the non-fixed side of the light-shielding piece is held by the receiving surface. Even when the film is rewound, the light blocking piece does not enter through the slit, so that reliable light blocking can always be performed.

Hereinafter, the present invention will be described with reference to the illustrated embodiments.

〔Example〕

In FIGS. 1 and 2 showing a photographic film cartridge using the present invention, a 135 type film 2 is wound around a spool 3 having flanges 3a at both ends to form a film roll. The end of the film 2 is fixed to the spool 3. The spool 3 is rotatably housed in the cartridge body 5. The patrone body 5 is composed of an upper body 5a and a lower body 5b, both of which are made as plastic molded products. Port portions 6a and 6b are integrally formed on the upper body 5a and the lower body 5b, respectively.

Ribs 8 and 9 are integrally formed on the inner walls of the upper body 5a and the lower body 5b. These ribs 8 and 9 come into contact with the outermost periphery of the film roll at the positions where the perforations are arranged on both side edges of the film 2.
The contact resistance when the film roll rotates inside is not preferable, and the film 2 is prevented from being loosened from the spool 3. Further, a tip separating claw 10 is provided adjacent to a portion where one rib 8 faces the port portion 6b. The tip separating claw 10 scoops the film tip 2a from the film roll and guides it to the discharge port 11. The tip separating claw 10 is provided at a position where the film tip 2a is scooped inside the perforation row so as not to be caught in the perforation row.

Slit 13 that enters from the outlet 11 and serves as a film passage
In order to prevent light from entering the inside of the cartridge body 5 through the
12 are glued. Various materials having elasticity and light-shielding property can be used as the material of the light-shielding piece 12, but in addition to unstretched or uniaxially stretched or biaxially stretched PET (polyethylene terephthalate), HDPE (high density polyethylene), MDPE
(Medium density polyethylene), LDPE (low density polyethylene), PS (polystyrene) and other plastic films with light shielding properties are suitable. Further, in order to impart light-shielding properties to these films, a method of kneading a light-shielding pigment such as carbon black into the film, a method of applying the light-shielding pigment to the film, or a method of laminating the thin film on the film, There is a method of laminating a light-shielding metal thin film such as aluminum on a film.

As shown in detail in FIGS. 4 and 5, the light-shielding piece 12 covers the slit 13 formed inside the port portions 6a, 6b from the outside so that the upper side portion 12a of the light-shielding piece 12 has the port portion 6a. The holding surface 14a formed obliquely on the inner wall is joined with an adhesive. The other lower side portion 12b becomes a free end and is elastically pressure-bonded to the receiving surface 14b formed on the inner wall of the port portion 6b. Further, the size of the light shielding piece 12 in the width direction is also larger than the width of the slit 13, and the holding surface 14a, the receiving surface 14b surrounding the slit 13 and the receiving surfaces 14c on both sides overlap each other with a width D. As the value of this width D,
0.5mm or more is desirable, and further, the shading piece 12 and the receiving surfaces 14b, 14c
If there is a gap between the and, it should be kept to 0.2 mm or less.

As shown in FIG. 3, the light shielding piece 12 is deformed by being pushed by the film tip 2a when the film tip 2a is sent toward the discharge port 11 by the rotation of the spool 3. Therefore, it is necessary to make the resistance force that the film tip 2a receives from the light-shielding piece 12 at the time of feeding the film tip 2a smaller than the feeding force of the film. Further, since the light-shielding piece 12 is always in contact with the back surface side of the film 2 after the film front end portion 2a is sent out from the slit 13, it is necessary to give the light-shielding piece 12 an appropriate smoothness. desirable. For this purpose, for example, the light shielding piece 12 may contain a lubricant such as silicone oil. Of course, it is also effective to add a lubricant to the base material of the film 2 itself.

In order to reduce the feeding resistance of the film tip portion 2a, it is advantageous to reduce the angle θ (FIG. 4) of the light shielding piece 12, but if this angle θ is too small, the port portions 6a, 6
Since b becomes longer, the size of the Patrone body 5 and the shading piece 1
Considering the shading function of 2, it is better to keep it in the range of 20 ° to 75 °. Further, in this embodiment, the lower side of the light-shielding piece 12
To ensure that the 12b is crimped to the receiving surface 14b, the receiving surface 14b
The hem of the has an arc shape with a radius R (= 2 mm).

In the photographic film cartridge having the above structure, the film tip portion 2a is completely wound in the cartridge body 5 in the unused state. In this state, the light shielding piece 12 is pressed against the receiving surface 14b by its own elasticity, and both side edges are also pressed against the receiving surface 14c, so that the light entering from the outlet 11 is blocked by the light shielding piece 12, It does not enter the inside of the Patrone body 5 through the slit 13. When the spool 3 is rotated clockwise, the film roll also rotates with it. During this rotation, the tip 2a of the film is picked up from the film roll by the tip separating claw 10, and the slit 1 formed between the ports 6a and 6b.
Go through the 3 toward the outlet 11. Then, as shown in FIG. 3, the film tip portion 2a pushes open the light shielding piece 12 against its own elasticity, and is led out from the discharge port 11. The free end side of the shading piece 12 is slit at an angle θ toward the outlet 11.
Since 13 is covered, a large load is not applied to the film tip portion 2a when the film is fed.

After the film 2 is sent out in this way, when the film 2 is rewound into the cartridge body 5 again, when the film front end 2a is pulled in from the slit 13, the light shielding piece
The elasticity of 12 again makes close contact with the receiving surfaces 14b and 14c to cover the slit 13. Therefore, even after rewinding, the inside of the cartridge body 5 is completely shielded from light.

6 to 8 are cross-sectional views of essential parts showing other embodiments of the present invention. In the embodiment shown in FIG. 6, the light shielding piece 20 is further joined to the tip of the port portion 6a to cover the discharge port 11 with the second light shielding piece 20, and the hem portion of the receiving surface 14b is linearly connected to the discharge port 11. It was made. In this example, the film tip 2a
It is necessary to push open the two shading pieces 12 and 20, but the shading function can be further improved. In addition, since it is not necessary to always bend the lower side portion of the light shielding side 12 in the unused state, there is an advantage that the bending behavior does not occur in this portion.

In the embodiment shown in FIG. 7, the second light-shielding piece 20 used in the embodiment shown in FIG. 6 is slanted similarly to the first light-shielding piece 12, and the resistance at the time of feeding the film front end 2a is set. Is designed to be low. The second light blocking piece 20 may be tilted in the opposite direction to the light blocking piece 12, and the lower side of the second light blocking piece 20 may be joined to the port portion 6b.

In the embodiment shown in FIG. 8, the discharge port 11 is provided with a pressing piece 22 made of the same material as the light shielding piece 12. The upper side of the pressing piece 22 is joined to the inner wall of the port 6a, and the lower side of the pressing piece 22 presses the lower side of the light shielding piece 12 against the receiving surface 14b of the port 6b in a bent state. According to this, due to the elasticity of the pressing piece 22, the free end side of the light shielding piece 12 is reliably pressed against the receiving surface 14b, and the light shielding function becomes more reliable. Then, even if the light-shielding piece 12 has a slight bending habit and is left for a long time in a state where the film 2 is pulled out, the film 2 is kept in the cartridge body 5.
When rewound into the inside, the slit 13 is pressed by the pressing piece 22.
Is surely covered by the shading piece 12. Further, by setting the width of the pressing piece 22 to be equal to or larger than the width of the slit 13, the pressing piece 22
The light blocking effect can be imparted to itself.

As a sample product embodying the present invention, FIGS.
Ten photo film cartridges having the port shape shown in the figure were prepared. Patrone body 5 of this sample product
As the molding material, HIPS (impact-resistant polystyrene) containing 5% (by weight) of carbon black was used, the radius of the inner wall of the cylindrical portion of the cartridge body 5 was L, and the gap of the slit 13 was
When A, the opening height and the external height of the discharge port 11 are B and C, respectively, L = 100 mm, A = 1 mm, B = 5 mm, and C = 8 mm. When the width of the slit 13 is D and the opening width and the outer width of the discharge port 11 are E and F, respectively, D = 35.5 mm, E = 38.5 mm,
F = 41 mm. Note that R = 2 mm in order to bend the lower side of the light shielding piece 12.

Further, a film made of the same material as the light-shielding piece 12 is fixed to the inner wall of the port portion 5a by a pressing piece 24 curved in an "Ω" shape so that the lower side portion of the light-shielding piece 12 is closely attached to the receiving surface 14b.
The light-shielding piece 12 and the pressing piece 24 are made of a biaxially stretched PET film having a thickness of 60 μm and containing 8% of carbon black. The size of the light-shielding piece 12 is 38 mm in the horizontal axis and 10 mm in the vertical direction. The thickness is 50 μm. In addition, the Patrone body 5 accommodated 135 films with a length equivalent to 24 shots.

As a comparison product with respect to the sample product, as shown in FIG. 11, a port-shaped product in which the receiving surface 14b for receiving the free end side of the light shielding piece 12 was omitted was prepared. The dimensions of each part G, H, and J in the figure are 2 mm and 5 mm, respectively.
mm and 7 mm, and the width direction is the same as the sample product.

After loading 10 sample products and comparative products into the camera and taking pictures up to the 12th one, let it stand for 1 month and then rewind it to the tip of the film inside the Patrone body. It was exposed to light for 30 seconds and then developed. As a result, no fog was found on the film for any of the 10 sample products. However, in the case of the comparative example, clear fog was observed in the portion from the tip of the film to the fifth to sixth laps in a state of being wound on the spool.

From this experimental result, the light-shielding piece 12 is likely to be deformed by being left for a long period of time, and when the receiving surface 14b is omitted, a gap is easily formed between the free end of the light-shielding piece 12 and the inner wall of the port portion 6b. Is supposed to be. Therefore, even if the shading piece 12 is slightly deformed, the receiving surface is provided on the free end side of the shading piece 12 so that the slit 13 can be covered with a margin.
It turns out to be advantageous to provide 14b. Also, the receiving surface 1
The film 4b also has a function of preventing the light-shielding piece 12 from being caught in the main body of the film cartridge when the film is rewound, and thus is particularly effective for a photo film cartridge in which the film is fed and the film is rewound.

The present invention has been described above with reference to the illustrated embodiment, but as a means for pressing the free end side of the light shielding piece 12 against the receiving surface 14b, a weak spring made of a metal plate or the like or a plastic foam body or the like is used. It is also possible to use a sponge-like substance, and the pressing means is not necessarily required to have a light-shielding property. The present invention can also be used in a photographic paper magazine that stores photographic paper in a roll in a light-shielded state.

[Effects of the Invention] As described above, according to the present invention, the light-shielding piece and the free end of the light-shielding piece are prevented from leaking light from the slit for discharging the film in an unused state where the leading end of the film is completely wound. This can be reliably prevented by the receiving surface, and a large load is not applied to the film tip portion when the film tip portion is fed. Furthermore, since the receiving surface receives the free end of the light shielding piece when the film is rewound, the light shielding piece is not caught in the main body of the cartridge, and a highly reliable light shielding function can be achieved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of the present invention. FIG. 2 is a sectional view of the above-described first embodiment in the film-wrapped state. FIG. 3 is a sectional view of the film of the first embodiment as it is fed out. FIG. 4 is a sectional view showing the structure of the port portion of the first embodiment. FIG. 5 is a front view of the port portion of the first embodiment. 6 to 8 are cross-sectional views of the essential parts showing the structure of the port part in another embodiment of the present invention. 9 and 10 are cross-sectional views of the essential parts of the sample product of the present invention used for the light-shielding test. FIG. 11 is a cross-sectional view of essential parts of a comparative product used in a comparative example of the light-shielding test. 2 …… Film 2a …… Film tip 3 …… Spool 5 …… Patrone main body 6a, 6b …… Port section 11 …… Discharge port 12 …… Shading piece 13 …… Slit 14a …… Holding surface 14a, 14c …… Receiving surface 22,24 …… Pressing piece.

Claims (2)

(57) [Claims] 1. A photographic film cartridge in which a spool around which a film is wound is rotatably accommodated in a cartridge body, and by rotating the spool, the leading end of the film is sent out from a slit for discharging the film formed in the cartridge body. In the above, one long side is fixed along one side in the longitudinal direction of the slit, and the other long side becomes a free end to cover the slit by its own elasticity, and the other of the light shielding pieces. A photographic film cartridge having a receiving surface for receiving the long side and the both short sides, respectively, and a receiving surface for preventing the light shielding piece from entering the inside of the cartridge body from the slit. 2. A biasing means for pressing the other long side of the light-shielding piece against the receiving surface.
The pictured photo film Patrone.