JPH02195344A - Film cartridge and camera using the same - Google Patents

Abstract

PURPOSE:To eliminate confusion between unused and used film cartridges by pushing and deforming a deforming member while the film cartridge is taken out from a camera body, and showing that the film is used. CONSTITUTION:When the unused film cartridge 14 with its film tang part 23 drawn out is loaded on a cartridge room 16, the film tang part 23a is engaged with a sprocket 30. Then, a rear cover 9 is closed: Immediately after the rear cover is engaged at a closing position by a locking mechanism 12, a protrusion 31, which is provided on the inner surface of the rear cover 9, breaks through a paper tape 21 with partially caused large pressure and intrudes into a recessed part 19. In this time, since the paper tape 21 is broken, the film cartridge can be judged to be unused regardless of presence/absence of the film tang part 23. Whether the film cartridge is used or unused is thus easily and surely discriminated only by observing its outside.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a novel film cartridge and a camera using the cartridge.

[Conventional technology]

When using a conventional commercially available film cartridge such as 135 film, the film tongue is pulled out before use, and the film is loaded by setting the film tongue on the take-up spool side of the camera. When the film is rewound after shooting, the film tank is generally completely wound into the film cartridge, so the user determines whether the film cartridge is used or unused by whether or not the film tongue is exposed. be able to.

[Problem to be solved by the invention]

However, some cameras do not necessarily wind the film all the way to the tongue in order to efficiently start the film development process. therefore,
It may not be possible to determine whether a film cartridge with the film tongue portion pulled out is unused, and it may not be clear whether the cartridge has been used or not. For this reason, there have been disadvantages such as accidentally double-exposure on film that has already been exposed, and mistaking unused film as used film.

On the other hand, the present applicant has proposed a cartridge having a novel structure in which the film tongue portion is not exposed in advance in the patent application filed in 1983-216.
As proposed in No. 484, in this type of cartridge, the tongue is not exposed both before and after use, so there is a risk of misidentification as described above.

[Purpose of the invention]

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a film cartridge that can easily and reliably determine whether a film has been used or not by simply observing the outside, and a camera using the cartridge. With the goal.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a deformable member that is irreversibly deformed by pressure on the outer surface of a film cartridge.

Further, in a camera configured to use up a film cartridge provided with a deformable member that is irreversibly deformed by pressure on the outer surface, the deformable member is deformed to a position facing the housing chamber of the film cartridge and corresponding to the deformable member. A camera using the cartridge may be configured such that a modified drive means is provided and the drive means is activated in response to closing the camera lid to indicate that the film has been used.

[Effect]

According to the above, after loading the film cartridge into the camera body and taking out the image, the deformable member is deformed by, for example, locking the lid of the camera 4.
Therefore, it is possible to easily and reliably determine whether the film has been used or not, simply by observing the deformable member, regardless of whether the film tongue portion is wound up or not.

Embodiments of the present invention will be described below with reference to the drawings.

〔Example〕

In FIG. 2, when the camera 10 to which the present invention is applied is observed from behind, the left end of the camera body 11 has a locking mechanism 12 for locking the back M9. A knob 13 for operating the locking mechanism 12 is provided, and a cartridge chamber 16 for loading a film cartridge 14 is provided. A fork member 17 that is driven when rewinding the film is disposed on the ceiling of the cartridge chamber 16, and a fork member 17 that is driven when rewinding the film is disposed on the ceiling of the cartridge chamber 16.
A notch 18 is formed for loading.

The film cartridge 14 is made, for example, as a plastic molded product, and has a recess 19 formed in its circumferential surface. A thin film such as a paper tape 21 is stretched over this recess 19 under tension. The film cartridge 14 has a reel (not shown) for winding the film like a normal film cartridge.
The tip 22 of this reel projects upward. From an unused film cartridge 14, the film tongue portion 2 is removed.
3 is drawn out.

A film winding chamber 24 is provided at the right end of the camera body 11, and a spool 26 is disposed therein. Also,
The hinge portion 27 pivotally supports the back cover 9 so that it can be opened and closed. The back cover 9 has a film pressure plate 28° and a film presser 29. and a protrusion 31 are provided. The protrusion 31 prevents the loaded film cartridge 14 from closing and locking the back cover 9.
Break through the upper paper tape 21.

Hereinafter, the operation of this embodiment configured as described above will be explained.

First, an unused film cartridge 14 with the film tongue portion 23 pulled out is loaded into the cartridge chamber 16. At the time of this loading, the film tongue portion 23a is engaged with the sprocket 30.

Immediately before the back cover 9 is closed and the lock mechanism 12 locks the back cover 9 in the closed position, the protrusion 31 provided on the inner surface of the back cover 9 has a locally generated large protrusion 31 as shown in FIG. The pressure pierces the paper tape 21 and enters the recess 19. Thereafter, the locking mechanism 12 is activated and the back cover 9 is locked in the closed position.

thus! When [9 is locked, the sprocket 30 is driven for initial feeding and the spool 26 is driven in the film winding direction.

When the film tongue portion 23 reaches the spool 26 due to the initial feeding of the sprocket 30, the film tongue portion 23
becomes wound around the spool 26. When the film tongue portion 23 is wound around the spool 26 and film feeding is started by driving the spool 26, the sprocket 30 rotates in accordance with the film feeding, and is thereafter used to detect one frame advance of the film.

Thereafter, exposure and film advance are repeated in sequence, and when all frames have been photographed, the film rewind mechanism built into the camera 10 is activated. As a result, fork member 1
7 rotates, the tip 22 of the reel rotates and winds up the exposed film into the film cartridge 14. After winding the film, operate the knob 13 to release the lock and open the back cover 9. film cartridge 1
Take out 4. In the film cartridge 14 at this time, as shown in FIG. 3, since the tape 21 is torn, it can be determined that it is a used film cartridge regardless of the presence or absence of the film tongue portion 23. Note that a thin plastic plate may be used instead of the paper tape. However, it is necessary to configure the device so that it deforms only when a large local pressure is applied, distinguishing it from shocks and the like that occur during normal handling. Further, when metal or the like is used, a predetermined scratch may be applied to the metal.

Furthermore, in addition to the above-mentioned form of the film cartridge, as shown in FIG.
Alternatively, this type of application may be applied to the conventionally commercially available 35-kaku film cartridge specified by JISK752B. It may be applied to a cartridge. If this deformable piece 42 is deformed by a predetermined member when locking the back cover of the camera, etc., the deformable piece 42 will bend as shown in FIG. can be displayed.

Furthermore, as a member for deforming the above-mentioned Gion tape 21 and deformable piece 42, not only the protrusion 31 provided on the back cover 9, but also a member interlocked with the locking mechanism 12 or knob 13 of the back cover 9, etc. may be used. You can also do it. Furthermore, the position where the deformable member is provided is not limited to the position corresponding to the back of the camera.

〔Effect of the invention〕

As described in detail above, the present invention provides a deformable member that is irreversibly deformed by pressure on the outer surface of a film cartridge, and presses and deforms the deformable member before removing the film cartridge from the camera body. The screen now indicates that the film has been used. Therefore, whether the film is used or unused can be immediately determined from its appearance, thereby preventing confusion between an unused film cartridge and a used film cartridge.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of an embodiment of a film cartridge of the present invention and a camera using the cartridge. 2 is a perspective view of the embodiment of FIG. 1; FIG. FIG. 3 is an external view of a used film cartridge. FIG. 4 is an external view of a film cartridge according to another embodiment before and after use. 9 ・ ・ ・ l 2 ・ ・ 14, 4 16 ・ ・ 17 ・ ・ 19 ・ ・ 21 ・ ・ Back cover locking mechanism L... Film cartridge cartridge chamber Fork member Recess paper table 23 ・ ・ Film tongue part, protrusion, deformable piece . Figure 1 Figure 3 1

Claims (2)

[Claims] (1) A film cartridge characterized in that a deformable member that irreversibly deforms when pressed is provided on the outer surface. (2) In a camera capable of using a film cartridge provided with a deformable member on the outer surface that is irreversibly deformed by pressure, the deformable member is deformed to a position corresponding to the deformable member facing the housing chamber of the film cartridge. A camera characterized in that a deformation drive means is provided, and the drive means is actuated in response to closing a lid of the camera to indicate that the film has been used.