JPH0542432Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial field of application] This invention is a cartridge for photographic film, in particular,
This invention relates to a cartridge that stores photographic film made of 16mm or 35mm roll film.

[Conventional technology]

In the conventional photographic film cartridge, as shown in FIG. 5, a spool 51 wound with film 50 is loaded into a cylindrical body (patrone body) 52 such that the film tongue end 50' is exposed from a film outlet 53. Afterwards, caps 54 are fitted onto both ends of the cartridge body 52. In order to prevent outside light from entering the film outlet 53, light shielding ribbons 55a and 55b are attached to the upper and lower lip portions. As shown in FIG. 6, the conventional cartridge body 52 is provided with a V-shaped groove 56 at both ends thereof, and the outer ring edge 54' of the cap 54 is engaged with the inclined outer surface 56a of the V-shaped groove 56. It is narrowed inward so that it can fit together. Therefore, the cap 54 can be fitted onto the cartridge body 52 by applying strong pressure such that its edge 54' passes over the sloped surface of the outer end 52' of the cartridge body 52.

[Problem that the invention attempts to solve]

However, the seventh edge 54' of the cap 54 is attached to the inclined surface of the outer end 52' of the cartridge body 52.
When applied with strong pressure as shown in Figure a, the impact may cause the side portions 55a' of the light-shielding ribbon 55a attached to the upper and lower lip portions of the film outlet 53 to peel off and curl up as shown in Figure b. There was a possibility that light leakage would occur from this portion (the portion indicated by the symbol A in FIG. 5).

Furthermore, since the cartridge body 52 is narrowed down by fitting the cap 54, the V-shaped groove 56
The pile of light-shielding ribbons 55a and 55b stuck along the unevenness on the inner surface of the spool 51 comes into contact with the flange 51' of the spool 51, giving resistance to the spool and increasing the film pull-out load. It was hot.

This invention is intended to solve the above-mentioned problems, and aims to provide a cartridge for photographic film that reduces the load for pulling out the film and improves light shielding properties.

[Means for solving problems]

In order to achieve the above object, this invention includes a cylindrical body formed by pasting light-shielding ribbons on the upper and lower lips of the film outlet, and an annular U-shaped groove that can be fitted into both ends of the cylindrical body. In a photographic film cartridge comprising a cap provided on the outer periphery and a through hole in the center through which the shaft end of the film is inserted, a light-shielding ribbon is placed in a U-shaped groove of the cap that fits into the cylindrical body. By retracting a portion of both sides, the light-shielding ribbon will not be peeled off when the cap is attached, and the pile of light-shielding ribbon attached to the narrowed cartridge body will not come into contact with the spool flange after the cap is attached. It is composed of

〔Example〕

Next, this invention will be explained based on an embodiment shown in FIGS. 1 to 4.

In FIG. 1, 1 is a cylindrical body (patrone body) having a film outlet 2, 3 is a cap that fits on both ends of the cartridge body 1, and the cap 3 has a spool 4 in the center. It has a hole 3a into which the shaft 4' is fitted, and has U-shaped grooves 3b on its outer periphery into which both ends of the cartridge body 1 are fitted.

The film outlet 2 has a lower lip 2b folded back in a hook shape facing a flat upper lip 2a in a beak shape, and light shielding ribbons 6a and 6b are attached to the opposing surfaces, respectively. The light-shielding ribbons 6a, 6b have both side portions 6a', 6b' extending beyond the width of the lip, and when the cap 3 is fitted, as shown in the second figure,
A part (striped pattern part) a of a', 6b' is housed in the U-shaped groove 3b of the cap 3, and the light-shielding ribbons 6a and 6b are
The pile b is now sufficiently separated from the spool film 4'' (see Figure 3).

In this way, the light shielding ribbons 6a and 6b are attached to the cap 3.
In order for the cap to be accommodated in the U-shaped groove 3b when it is fitted, the width and height of the U-shaped groove 3b of the cap 3, the compressibility of the pile portions of the light-shielding ribbons 6a and 6b, and the The peel strength between the light shielding ribbons 6a, 6b and the cartridge body 1 is also an important factor.

Therefore, as shown in the third figure, it is preferable that the width U of the U-shaped groove 3b of the cap 3 is set within the range of 1.0 to 1.4 mm, and the height H thereof is set within the range of 2.2 to 2.7 mm. On the other hand, the pile height l of the light-shielding ribbons 6a and 6b is set within the range of 1.2 to 1.7 mm. In this case, the light-shielding ribbons 6a and 6b are made of nylon and have compressibility as shown in FIG. and focused to about 0.6 mm (pressure force is 10
It has such compressibility that the amount of change becomes almost flat when it exceeds Kg. Therefore, the thickness of the body 1 is
Even if 0.3 mm is taken into consideration, if the width U of the U-shaped groove 3b is 1.0 mm or more as described above, it will not become a hindrance to storage.
On the other hand, the upper limit of the width U of the U-shaped groove 3b is set to 1.4 mm, because when the cap 3 is connected to the cartridge body 1, the inner ring part 3b' of the U-shaped groove 3b is cut with a machining tool (Fig. In the case where a coupling method is used in which the outer ring part 3b'' is pressed outward by friction (not shown) and held between the outer ring part 3b'', the width U of the U-shaped groove 3b is 1.4
If the diameter exceeds mm, not only will machining become difficult, but a powerful machining tool will be required.
This is because it becomes a factor that increases manufacturing costs.

In addition, when using a coupling method (crimping method) in which the cap and the cartridge body are held between the inner and outer rings as shown in Figure 3, the cap must be maintained in a fitted state against a detachment force of up to 1530 kg. However, as shown in Figure 6, the so-called snap-in type, in which the outer ring edge of the cap is engaged with the V-shaped groove of the cartridge body, is about 5 to 12
Even if a detachment force of Kg is applied, the cap may come off and the light-shielding properties may be impaired, but the above-mentioned caulking method can contribute to improving the light-shielding properties from this aspect, and can also be used during transportation, storage, and other handling operations. becomes easier.

The peel strength of the light shielding ribbons 6a and 6b is 800~
Preferably within the range of 2000Kg. This means that if it is 800 g or more, the light shielding ribbons 6a, 6b will not peel off when the cap is fitted, but it is not necessary to have a peel strength of more than 2000 g. That is, it shows a preferable range of peel strength for maintaining light-shielding properties.

In addition, the height H of the U-shaped groove 3b of the cap 3 is 2.2
The reason why the thickness is set within the range of ~2.7 mm is that if it is less than 2.2 mm, it is difficult to maintain light-shielding properties, and if it exceeds 2.7 mm, it will interfere with the film outlet.

○Example (1) Under the following conditions, the cartridge body cap was fitted and joined by caulking.

Cap U-shaped groove width 1.2mm, height 2.5mm Light-shielding ribbon Pile height 1.6mm, peel strength 1100g Patrone body Thickness 0.3mm Film 24 color, ASA400 As a result, parts of both sides of the light-shielding ribbon peeled off. It was neatly stored in the U-shaped groove of the cap without any damage.

○Example (2) Prepare 50 cartridges each containing the photographic film of the present application obtained in Example (1) above and conventional cartridges containing photographic film, and add 80,000 Lux to these cartridges.
When the interior film was irradiated for 1 minute (xenon lamp) and the interior film was checked for fogging, it was found that there was no fogging at all in the cartridge of the present invention, and fogging was found in 5 of the conventional cartridges. When I disassembled the cartridges with this fog, I found that all of them were defective due to the light-shielding ribbon getting caught up in the cartridges.

[Effect of idea]

As described above, this invention consists of a cylindrical body formed by pasting light-shielding ribbons on the upper and lower lips of a film outlet, and an annular U that can be fitted onto both ends of the cylindrical body.
In a photographic film cartridge comprising a cap having a U-shaped groove on the outer periphery and a through hole in the center through which the shaft end of the spool is inserted, there is a U-shaped groove in the cap that fits into the cylindrical body. Since a part of both sides of the light-shielding ribbon is stored, the light-shielding ribbon will not be peeled off when the cap is fitted, contributing to improved light-shielding performance. Furthermore, the pile of light-shielding ribbon stuck to the cartridge body that has been narrowed down after the cap is fitted does not come into contact with the spool flange, thereby preventing an increase in the film pull-out load.

[Brief explanation of the drawing]

Fig. 1 to Fig. 4 show one embodiment of this invention, Fig. 1 is an exploded perspective view, Fig. 2 is a partially enlarged perspective view when the cap is fitted, Fig. 3 is a partially enlarged sectional view showing the fitted state of the cap, Fig. 4 is a graph showing the compressibility of the light-shielding ribbon, Fig. 5 to Fig. 7 show a conventional example, Fig. 5 is a perspective view, Fig. 6 is a partially enlarged sectional view showing the fitted state of the cap, Fig. 7a and 7b are partially enlarged perspective views before and after the cap is fitted. 1 ... Cylindrical body part (Patrone body part), 2 ...
Film outlet, 2a, 2b...upper and lower lip parts,
3: Cap; 3a: Hole; 3b: U-shaped groove;
3b': inner ring portion, 3b": outer ring portion, 4: spool, 6a, 6b: light-shielding ribbon.

Claims (1)

[Claims for Utility Model Registration] (1) A cylindrical body formed by pasting light-shielding ribbons on the upper and lower lips of a film outlet, and an annular U-shaped groove that can be fitted into both ends of the cylindrical body. In a photographic film cartridge comprising a cap provided on the outer periphery and a through hole in the center through which the shaft end of the spool is inserted, a light-shielding ribbon is placed in a U-shaped groove of the cap that fits into the cylindrical body. A cartridge for photographic film that is characterized by partially retracted parts on both sides. (2) The photographic film cartridge according to claim 1, wherein the cap has a U-shaped groove having a width of 1.0 to 1.4 mm and a height of 2.2 to 2.7 mm. (3) The photographic film cartridge according to claim 1 or 2, wherein the light-shielding ribbon has a pile height set within a range of 1.2 to 1.7 mm. (4) For a photographic film according to one of claims 1 to 3 of the utility model registration claim, wherein the light-shielding ribbon is attached to the cylindrical body with a peel strength within the range of 800 to 2000 g. Patrone. (5) The scope of the utility model registration claim, wherein the cap is coupled to the cylindrical body by pressing the inner ring of the U-shaped groove outward and sandwiching the cylindrical body with the outer ring. A cartridge for photographic film as described in one of items 1 to 4.