JPH02201441A - Photographic film cartridge - Google Patents

Abstract

PURPOSE:To eliminate the need to mount a light-shielding member by permitting a light-shielding cover to close a film outlet and to keep a light-shielding condition. CONSTITUTION:A spool 2 is disposed inside a cartridge main body 4 so that the spool 2 can rotate around an axial line. The cartridge main body 4 is provided with the film outlet 5 to pull out a photographic film 3. The light-shielding cover 6 is mounted on the cartridge main body 4, and is formed in such a way that the film outlet is closed by its top part 6a. The light-shielding cover 6 can be slid in a direction B which inclines in a pulling-out direction A of the photographic film 3 along with the slope 4a of the cartridge main body 4. Thus, it is unnecessary that a film end part is pulled out outside the cartridge in advance, and that the light-shielding member is mounted on the film outlet.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a photographic film cartridge.

[Conventional technology]

Conventionally, photographic film has been sold on the market in the form of a roll wound around a spool and stored in a cartridge. This cartridge has a film drawer opening, from which a predetermined amount of film is pulled out for photographing. In the structure of a conventional cartridge, this film outlet is in the form of a slit, and the end of the film is pulled out in advance by a considerable length from the film outlet for loading into the camera. For this reason, the film drawer is generally marked with “
A light-shielding member called "Teremp" is installed to maintain the light-shielding state inside the cartridge.

However, attaching this light shielding member has been accompanied by various problems. The second problem is that poor light density occurs, although it is a low frequency, the resistance of drawing the film is not uniform, the film may be scratched, and it is difficult to make the thickness of the telescope uniform, resulting in low production efficiency. In addition, since the end of the film is extended outside the cartridge, a photosensitive material that is prone to light piping cannot be used for the film.

In addition, when loading a conventional cartridge into a camera, it is necessary to set the end of the film that has been pulled out from the outside of the cartridge into the camera's film pull-out mechanism, but this operation requires a certain degree of skill and is time-consuming. It takes a lot of money.

In view of these points, the applicant has filed a patent application for a photographic film cartridge in 1983, which eliminates the need for a light-shielding member and in which the edge of the film is not drawn out to the outside of the cartridge.
-57785.

This photographic film cartridge has a film drawer that can be opened and closed. Before loading the camera, the entire film, including the leading edge, is stored inside the cartridge, and the film drawer is closed to prevent light exposure. No parts are required. When the cartridge is loaded into the camera, the upper surface of the cartridge is bent in conjunction with a mechanism on the camera side to open the film drawer opening, and the film is pulled out and guided to the exposure position within the camera. After shooting is completed, the film is wound into the cartridge and the cartridge's film drawer is closed. However, although this cartridge is made of plastic, the film drawer opening is opened and closed by bending the top of the cartridge, so if the plastic loses its elasticity due to creep, the top of the cartridge will break. However, there were problems with durability.

[Problem to be solved by the invention]

The present invention has been made in view of the above points, and eliminates the need to pull out the edge of the film in advance, eliminates the need for a light shielding member, and avoids the durability disadvantages of plastic cartridges. The purpose of this product is to provide a photographic film cartridge with a high quality.

[Means to solve the problem]

In order to achieve this object, in the photographic film cartridge according to the present invention, a light-shielding cover is attached to the cartridge body, which is slidable along the surface of the cartridge body in a direction oblique to the direction in which the photographic film is pulled out. Before photographing, the light-shielding cover closes the film outlet and maintains the light-shielding state, and during photographing, the light-shielding cover slides in the aforementioned direction to open the film outlet.

In addition, a protrusion may be formed on the inner surface of the light-shielding cover near the film outlet, and the photographic film may be provided with a hole that engages with the protrusion. It is also possible to keep the photographic film tightly wound on the spool.

[For production]

According to the above-described structure of the present invention, the film is stored inside the cartridge before photographing, and the light-shielding state is maintained by closing the film drawer opening with the light-shielding cover. Therefore, it is not necessary to attach a light shielding member, and it is also not necessary to draw out a considerable length of the end portion of the film to the outside of the cartridge in advance as in the conventional case. Accordingly, there is no need to set the end of the film in the film pull-out mechanism of the camera.

When the cartridge is loaded into the camera, the light-shielding cover is slid by a mechanism on the camera side in a direction oblique to the direction in which the film is pulled out, and the film pull-out opening is opened. After this, the camera's film extraction mechanism withdraws the film and guides it to the exposure position. In this case, if a protrusion is formed on the inner surface of the light-shielding cover near the film draw-out opening, and a hole is provided in the film to engage with this protrusion, the protrusion pulls out the film as the light-shielding cover slides. Since the light-shielding cover advances in a diagonal direction with respect to the direction in which the film is pulled out, when the light-shielding cover advances to a certain extent, the engagement between the protrusion and the hole is released. Alternatively, if you keep the film tightly wound on the spool, you can feed the film from inside the cartridge to the outside by rotating the spool in the opposite direction to the film winding direction, so you can slide the light-shielding cover off. After moving the camera to open the film outlet, the film can be fed into the camera.

After shooting, the film is rewound inside the cartridge, the light-shielding cover is slid to its original position, and the film drawer is closed, thereby maintaining the light-shielding state of the cartridge again.

〔Example〕

An embodiment of a photographic film cartridge according to the present invention is shown in FIGS. 1(a) and 1(6). Figure (a) is its perspective view;
Figure (6) is a cross-sectional view. photographic film cartridge
is spool 2, photographic film 3 wound on spool 2
, and a cartridge main body 4, the spool 2 is arranged inside the cartridge main body 4 so as to be rotatable about an axis, and the cartridge main body 4 is provided with a film draw-out opening 5 for drawing out the photographic film 3. A light shielding cover 6 is attached to the cartridge main body 4. Light blocking cover 6
is formed so as to close the film drawer opening 5 with its tip 6a, and is tilted along the slope 4a of the cartridge main body 4 in the direction in which the photographic film 3 is pulled out (the direction indicated by the arrow in FIG. 1(c)). It is possible to slide in the direction of the arrow B (direction of arrow B). A pin 7 is formed on the inner surface of the light-shielding cover 6 near the film drawer opening 5, and a pin 7 is formed on the inner surface of the light-shielding cover 6 to remove the photographic film 3.
is provided with a hole 8 that engages with this pin 7. A notch 9 is provided around the pin 7 of the cartridge main body 4, and as shown in FIG. 1(a), the pin 7 and the hole 8 are engaged with each other before the cartridge is used. Guide grooves 10 are provided on both sides of the cartridge main body 40, and recesses 11 lower than the guide grooves 11 are provided at both ends of the guide grooves 10.
a, llb are formed. A hemispherical projection 12 is formed on the light shielding cover 6 in correspondence with the guide groove 10, and as the projection 12 moves along the guide groove 10, the ζ light shielding cover 6 slides. Further, the protrusion 12 is connected to the recesses 11a, l
lb, the light shielding cover 6 is fixed at each position. Furthermore, the light shielding cover 6 includes
A hole 13 for engaging a camera's light shielding cover opening/closing mechanism (not shown) and an opening 14 for a camera's film feed roller (not shown) to contact the photographic film 3 are provided.

This photographic film cartridge 1 functions as follows.

The photographic film cartridge 1 is loaded into the camera in the state shown in FIG. 1(a). In this state, the film outlet 5 is closed by the tip 6a of the light-shielding cover 6, and the protrusion 12 fits into the recess 11a to fix the light-shielding cover 6 and prevent the light-shielding cover 60 from sliding. Therefore, the light-shielding property of Patrone I is ensured. Therefore, there is no need to use a telescope as a light shielding member used in conventional cartridges. In addition, the photographic film 3 is all stored inside the cartridge l,
It is not necessary to pull out the film end portion to the outside of the cartridge in advance as in the conventional case, and therefore, there is no need to perform an operation to set the film end portion in the film pull-out mechanism of the camera.

It is sufficient to simply load Patrone 1 into the film chamber of the camera.

When the cartridge 1 is loaded into the camera, the light-shielding cover opening/closing mechanism of the camera engages with the hole 13, and forces are applied to the light-shielding cover 6 in the directions A to B in FIG. 1(C). Under this force, the projection 12 and the recess 11a are disengaged, and the projection 12 is disengaged from the recess 11a.
The light-shielding cover slides along the guide groove 10.
6 as a whole starts sliding in direction B (see Figure 1).

FIGS. 2(a) and 2(b) show the state in which the light shielding cover 6 is sliding.
). As shown in the same figure (a), the light shielding cover 6 is
As it slides in the direction, the tip of the light shielding cover 6 gB 6
The film drawer opening 5, which had been closed by a, is now open. Since the pin 7 also moves together with the light-shielding cover 6, the pin 7 pulls the hole 8 of the photographic film 3, so that the photographic film 3 is pulled out from the open film outlet 5.

As the light-shielding cover 6 advances further from the state shown in FIG. Then, as shown in FIG. 3B, the engagement between the pin 7 and the hole 8 is released at a certain point. The photographic film 3 remains stationary at the time of its release. The light-shielding cover 6 continues to slide until the protrusion 12 fits into the recess 11b, and the light-shielding cover 6
is fixed in that position. After this, the photographic film 3 is guided to the exposure position of the camera by the film feed mechanism of the camera. In this case, as shown in FIG. 2Cb), the tip 6a of the light shielding cover 6 and the pin 7 are located apart from the film 3, so that they do not interfere with the film 3 being pulled out by the film feeding mechanism.

After shooting, rotate the spool 2 in the film rewind direction to rewind the film 3, and then close the light shielding cover 6 to B.
The projection 12 is slid in the opposite direction until it fits into the recess 11a. As a result, the film drawer opening 5 is closed, and the light-shielding cover 6 does not move easily due to the engagement between the protrusion 12 and the recess n11a, and the photographic film 3 inside the cartridge is not exposed to external light. The light shielding state of 1 is maintained. After this, the cartridge 1 can be taken out from the camera.

An example of a film feeding mechanism of a camera suitable for the photographic film cartridge 1 is shown in FIG. Open the side cover 21 of the camera 20 and load the photographic film cartridge 1. Side lid 21
A light shielding cover opening/closing rod 22 is attached to the holder, and a pin 23 that engages with the hole 13 of the cartridge 1 is provided at the tip of the rod 22. When the cartridge 1 is loaded into the camera 20, this pin 23 engages with the hole 13, and the side cover 21
When the camera is closed, the light-shielding cover 6 of the cartridge 1 slides through the rod 22, opening the film drawer 5, and the film drawer 5 opens with the photographic film 3 pulled by the pin 7. drawn from. When the side lid 21 is completely closed, the protrusion 12 of the light shielding cover 6 fits into the recess 4 part 11b. In this way, when the light-shielding cover 6 reaches the sliding end position, the tip portion 6 of the light-shielding cover 6
a comes into contact with the lever 24 inside the camera 20 and pushes the lever 24. The lever 24 is connected to a nip roller 26 at a connection point 25. The nip roller 26 is the connection point 2
5 and is pivotable about feed roller 27
It is arranged so that it can freely come into contact with and separate from it. Tip R6 of light shielding cover 6
When person a presses the lever 24, the nip roller 26 pivots counterclockwise about the connecting point 25, moves from the solid line position to the broken line position in the figure, and moves to that point through the opening 14 of the light-shielding cover 6. It comes into contact with the feed roller 27 with the photographic film 3 being pulled out sandwiched therebetween. After that, by rotating the feed roller 27 clockwise,
The photographic film 3 is guided onto a fog light plate 28, and after photographing is sent to a film winding shaft 29. After shooting, the film 3 is rewound into the cartridge 1 by rotating the spool 2 counterclockwise. When the side cover 21 is opened, the fitting between the protrusion 12 and the recess 11b is released, the light shielding cover 6 is closed via the rod 22, and the protrusion 12 is inserted into the recess fFi5.
11a and is fixed so that the light shielding cover 6 does not slide. After this, the photographic film cartridge 1 can be taken out from the camera 20. The nip roller 26 returns to its initial position (the position indicated by the solid line) when the tip 6a of the light-shielding cover 6 moves to the left in the figure and leaves the lever 24.

In this embodiment, the leading end of the photographic film is pulled out by a combination of the pin 7 on the inner surface of the light-shielding cover 6 and the hole 8 of the photographic film 3.
A similar effect can be obtained by using means for keeping the material tightly wound. If the photographic film 3 is kept tightly wound around the spool 2, the spool 2 can be rotated in the opposite direction to the film winding direction after sliding the light shielding cover 6 and opening the film drawer opening 5. Accordingly, the film 3 can be fed out of the cartridge 1 from the film outlet 5, and thereafter the film 3 can be fed, for example, by the above-mentioned film feeding mechanism.

As a means of keeping the photographic film tightly wound around the spool, there are two ways to keep the photographic film tightly wound around the spool. to the outer surface of the (N+1)th film of the same size are bonded using an adhesive means (e.g., double-sided adhesive tape, heat seal, etc.) that has an adhesive strength to the extent that it can be separated by rotating the spool. Providing a joining point in one place or in multiple places so that the joining points are not on the same circumference, ■ Providing a rib that projects inside the cartridge body to press the roll of photographic film tightly wound on a spool from the outer periphery, ■ For example, the spool may be provided with a flange having a tip that presses a roll of photographic film tightly wound around the spool from the outer periphery.

〔Effect of the invention〕

According to the present invention, it is not necessary to pull out the end portion of the film to the outside of the cartridge in advance as in the conventional case, and it is also not necessary to attach a light shielding member to the film draw-out opening. Further, the film drawer opening can be opened and closed without bending the lid of the cartridge body as in the conventional case, and there is no need to consider destruction due to creep, so the durability problem of plastic cartridges is also solved. Further, by using a combination of a pin on the inner surface of the light-shielding cover and a hole in the photographic film that engages with the pin, or a means for tightly wrapping the photographic film, the leading end of the photographic film can be pulled out more reliably. In addition to the above,
If the film feeding mechanism shown in the example is used, photographic film can be fed by a pair of rollers, so
It is also possible to eliminate the perforations provided on both sides of the photographic film in the width direction.

[Brief explanation of the drawing]

FIG. 1(a) is a partially cutaway perspective view of a photographic film cartridge according to the present invention, FIG. 1(6) is a sectional view of the cartridge, and FIG. This is a partially cutaway perspective view of the photographic film cartridge according to the present invention showing a state in the process of being removed. FIG. 3, a sectional view of the film cartridge, is a schematic view showing an example of a film feeding mechanism of a camera suitable for the photographic film cartridge according to the present invention. [Explanation of symbols] 1... Photographic film cartridge 2... Spool 3... Photographic film 4... Patrone body 4a... Slope of cartridge body 5... Film drawer opening 6... Light-shielding cover 6a... Tip of light-shielding cover 7... Pin 8... Hole 9 of photographic film... Notch la, llb... Concave portion 3... ... Hole 0 ... Camera 2 ... Light shielding cover opening/closing rod 3 ... Pin 5 ... Connection point 6 ... Nip roller 7 ... Feed roller 9 ... Winding shaft 10...Guide groove 12...Protrusion 14...Opening 21...Side lid 24...Lever 28...Exposure plate Fig. 1(a) b) Figure 2(b)

Claims (3)

[Claims] (1) Consisting of a spool, a photographic film wound around the spool, and a cartridge main body, the spool is arranged rotatably around an axis inside the cartridge main body,
In a photographic film cartridge in which the cartridge main body is provided with a film drawer opening for pulling out the photographic film, the cartridge is slidable along a surface of the cartridge main body in a direction inclined to a direction in which the photographic film is pulled out. A photographic film cartridge characterized by comprising a light shielding cover attached to the main body and sliding in the direction to open and close the film drawer opening. (2) A projection is formed on the inner surface of the light-shielding cover near the film outlet, and the photographic film is provided with a hole that engages with the projection. ) photographic film cartridge. (3) Claim (1) further comprising means for keeping the photographic film tightly wound around the spool.
) or the photographic film cartridge described in (2).