JPH09204009A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the erroneous display of a use state when a film cartridge is taken out from a camera. SOLUTION: This camera is provided with a film cartridge chamber cover opening/closing operation member 4 for releasing a film cartridge chamber cover locking member 5 for locking a cartridge chamber cover, and a film feeding part 2 rewinding the film in the cartridge in response to a film rewinding signal. Just before the film is taken out after finishing rewinding the exposed film, a cartridge spool is rotated and specified display is performed on a film use state display part 3, and then the locking member 5 is released.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera using a film cartridge capable of displaying and identifying the usage state of film.

[0002]

2. Description of the Related Art Conventionally, when not loaded in a camera, the leader portion at the front end of the film is completely wound in the film cartridge, and after loading, the film feeding mechanism on the camera side causes the film cartridge There have been proposed various types of film cartridges of the so-called thrust type, in which a film is sent out from the film cartridge.

Further, a film cartridge of this type having an opening / closing light-shielding door at the entrance / exit of the film is disclosed in Japanese Patent Laid-Open No. 3-116136, and the used condition (unused, used) of the film to be stored. Japanese Unexamined Patent Publication No. 5-17324 discloses a device provided with a data disk plate for discriminating the above) on the camera side.

The light-blocking door is movable between a closed position that covers the film entrance and exit and blocks external light that enters the film cartridge body, and an open position that allows the film to be fed and rewound. To prevent the light-shielding door from being opened unexpectedly when carrying the film cartridge and exposing the film, a shielding door lock member is provided to regulate the movement of the light-shielding door and securely lock it in the closed position. ing.

The data disk plate is adapted to rotate together with the spool of the film cartridge. Further, Japanese Patent Application Laid-Open No. 7-20613 discloses a film cartridge that locks and unlocks the rotation of the spool of the film cartridge in response to the closing and opening of the light shielding door.

FIGS. 3A to 3C show a light shielding door 10 near the upper surface of the film cartridge and a light shielding door driving portion engaging portion 1.
It is a figure which shows the cross section of the lock mechanism of the said light-shielding door comprised from 1 and the light-shielding door lock member 12. FIG. 4 (a), (b)
FIG. 4 is a view showing a cartridge spool rotation lock mechanism for locking / unlocking the rotation of the spool near the lower surface of the film cartridge. The light-blocking door 10, the cartridge spool 13, the teeth 18 provided on the cartridge spool 13, the cartridge spool The cartridge spool lock member 14 includes a lock member 14 and a cam 19. A protrusion 15 is provided on the cartridge spool lock member 14, and the cartridge spool lock member 14 is rotatably mounted around a shaft 16. There is. Further, the light shielding door 10
Is coupled to the light-shielding door drive member engaging portion 11 as shown in FIGS. 5 (a) and 5 (b). 3 (a) and 4
FIG. 3A shows a cross section in a state where the light shielding door is closed, and FIG.
4B and FIG. 4B are diagrams showing a state in which the light blocking door is open. Further, FIG. 3C shows a state in the middle of the operation of opening and closing the light shielding door.

3A and 4A, the light shielding door 10 is engaged with the light shielding door lock member 12 in a state where the light shielding door 10 is closed, at a portion 11a on the light shielding door driving member engaging portion 11. The rotation of the light shielding door 10 is locked. Further, as shown in FIG. 4A, the teeth 18 provided on the cartridge spool 13 are pushed by the cam 19 substantially toward the center of the cartridge spool lock member 14.
And the protrusion on the cartridge spool lock member 14 are engaged with each other, and the cartridge spool 13 is also locked. When opening the light shielding door 10, first, the light shielding door lock member 12 having one end fixed and the free end (so-called cantilever structure) is pushed in the direction of the arrow in the drawing of FIG. The part 11a on the light-shielding door driving member engaging portion 11 is unlocked and rotated clockwise to open the light-shielding door 10.

FIG. 3C shows the opening operation of the light shielding door 10, and FIG. 3B and FIG. 4B show the state in which the light shielding door 10 is completely opened. As shown in FIG. 4B, when the light shielding door 10 is open, the cam 19 does not act on the cartridge spool lock member 14, and the cartridge spool 13 is rotatably unlocked. There is.

Various film cartridges having the above-described structure for locking the light-shielding door and locking the cartridge spool have been disclosed.

In such a conventional film cartridge, for example, when the film cartridge is loaded in the cartridge chamber of the camera as in the device disclosed in Japanese Patent Laid-Open No. 7-306465, the light blocking door lock member is moved from the locked position. A large number of structures have been disclosed in which the light shielding door is opened by moving to the release position and then rotating.

However, in the state shown in FIGS. 3 (a) and 3 (b), no external force is applied to the light blocking door locking member, but the light blocking door locking member is in the unlocked position as shown in FIG. 3 (c). In the state of being retracted to, the light blocking door lock member is applied with an external force in the direction of the arrow shown in FIG.

That is, when the film cartridge is loaded in the cartridge chamber and the light shielding door is closed or in the state shown in FIG. 3C (half open), the light shielding door lock member is in a state where an external force is applied. Japanese Unexamined Patent Publication No. 7-30645 discloses that
If this state is maintained for a long time, the light blocking door locking member may be plastically deformed due to the creep phenomenon. In this case, the function as a lock is no longer fulfilled, the closed state of the light-shielding door cannot be locked, and the light-shielding door is inadvertently opened when carrying the film cartridge after taking it out from the camera. It is necessary to consider not to leave the light blocking door lock member elastically deformed for a long time. For example, it is necessary to be careful not to load the film in the cartridge chamber of the camera for a long time while the film is wound after the photographing is finished, that is, the light-shielding door is closed.

For the above-mentioned film cartridge,
For example, in Japanese Unexamined Patent Publication No. 5-100297, a camera using a film cartridge having the film use state display member displays a film use state display, for example, “exposed” after rewinding,
In order to prevent the cartridge spool from rotating when the camera is shaken or otherwise subject to vibrations, the fork that drives the cartridge spool has a locking member to prevent the usage status display from switching. There is disclosed a camera that locks the cartridge spool while being provided and displaying the usage state.

In recent years, a large number of cameras have been proposed in which one motor switches two driving systems such as a feeding system driving system and a zoom system driving system, and a cartridge spool driving system is displayed during use. There has been proposed a camera in which a gear train from a motor is bitten in a feeding system such as to prevent the cartridge spool from rotating due to vibration or the like.

[0015]

However, in the device disclosed in the above-mentioned Japanese Patent Laid-Open No. 5-100297,
A locking member for locking the fork that drives the film cartridge spool is required, which increases costs and hinders downsizing of the camera.

Further, in the case of a camera which drives by switching between two drive systems, for example, when the power SW is turned off and the mirror frame is to be stored, the drive force has to be switched to the zoom system, and the cartridge spool is It is impossible to keep fixed.

Therefore, an object of the present invention is to provide a camera that does not require a locking member and prevents an erroneous display of the usage state when the film cartridge is taken out from the camera.

[0018]

In order to achieve the above object, the present invention is a camera using a film cartridge provided with a means for displaying the film usage state by rotating the cartridge spool, and unlocks the lock member of the cartridge chamber lid. And a means for rewinding the film into the cartridge in response to a rewinding signal, and when the manual operation member is operated after the rewinding, the cartridge spool is rotated. Provided is a camera for releasing a lock member of a cartridge chamber lid after setting a film use state display means at a predetermined position.

The camera having the above-described structure uses the film cartridge spool and the film cartridge having the rotating film use state display portion.
When the opening and closing of the rear lid of the film cartridge is performed by opening and closing the rear lid and opening of the rear lid is detected, the cartridge spool is rotated to drive the film usage status display member to the appropriate display position and stop it. , The lock of the back cover is released, and the film cartridge can be taken out.

[0020]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a schematic configuration example of a camera as a first embodiment according to the gist of the present invention.

This camera has a CPU (Central Processing Unit) 1 for controlling each part of the camera, a film feeding unit 2 for winding and rewinding a film, and a rotatable film using a film cartridge spool. A status display unit 3, a film cartridge chamber lid opening / closing member 4 for opening and closing the film cartridge chamber lid, a film cartridge chamber lid locking unit 5 for locking the film cartridge chamber lid in a closed state, and a film cartridge spool rotation locking member 6. Composed of.

A series of operations of the camera shown in FIG. 1 will be described with reference to the flowchart shown in FIG.

First, it is judged whether or not a cartridge (not shown) is loaded (step S1).
O), the state is maintained until loaded, and if loaded (YES), the cartridge chamber lid is locked (step S).
2) The cartridge spool rotation lock member 6 is unlocked (step S3).

Next, the state of use of the film and, for example, the disk provided on the cartridge spool are described.
The barcode data serving as information about the film is read (step S4), and it is determined whether or not the film of the loaded cartridge has not been exposed (step S5).
If it is determined that the exposure has been completed (NO), the sequence of the present embodiment ends. In the case where the exposure has been completed, the sequence may be ended after the display proceeds to step S15 to be described later.

However, if it is determined in step S5 that the film has not been exposed (YES), an autoload operation is performed (step S6) and the first frame is set. Here, if the loaded film is a film that has been partially exposed, the film is fed to the first unexposed frame and then set. This may be a feeding method or a display method conventionally proposed. As for the autoloading, various types of autoloading devices have been disclosed, but any type may be used.

Next, when the automatic loading is completed, the photographing standby state is set (step S7), and when the photographing is performed by pressing the release SW (YES), one frame is wound to prepare for the next photographing. (Step S8).
Then, it is determined whether or not the shooting of the last frame is completed (step S9). If the shooting is not the last frame (NO), the process returns to step S7, and the shooting standby state is set again.

In step S7, if the release SW is not pressed in the shooting standby state (N
O), it is detected whether or not the rewind SW is pushed (step S10). If the rewind switch is pressed (YE
S), the process proceeds to the next step 11, and if not pressed (NO), the process returns to step S7. That is, in step S9 and step S10, when the one-frame winding after the shooting of the last frame is completed or the rewind SW is pressed, the rewind operation is started to rewind the film into the cartridge. (Step S11), it is determined whether or not the rewinding is completed (step S12). If the rewinding is not completed (NO), the rewinding operation is continued, and if the rewinding is completed (YES), the rewinding operation is stopped (step S13).

Next, it is detected whether or not the camera user has operated the closing member to open the cartridge chamber lid in order to take out the cartridge (step S14).
If no operation is performed to open the opening / closing member (NO),
The state before the closing member is operated is maintained. However, if the operation is performed (YES), the cartridge spool is rotated to display "exposure completed" on the film use state display section 3 (step S15). In addition, even if it is not displayed that exposure has been completed, any display that can notify the user of exposure completion may be used.

Then, the cartridge spool is locked so as not to rotate (step S16), and the lock of the cartridge chamber lid is released (step S17).

As described above, in the present embodiment, when the cartridge is loaded in the camera, the cartridge chamber lid lock portion 5 locks the cartridge chamber lid, and after the photographing and the rewinding of the film are completed, the cartridge chamber lid is closed. When an operation to open the opening / closing member is performed, a display indicating "exposed" is displayed in the film use state part, the cartridge spool is locked so as not to rotate, and then the cartridge chamber lid is unlocked. .

Therefore, immediately before the camera user takes out the cartridge, in order to display the film use status display as "exposed", after rewinding the film, the cartridge spool is rotated due to vibrations caused by dropping the camera or the like. It is possible to prevent the use state of the film from being erroneously displayed.

Incidentally, in the above-mentioned first embodiment,
Whether the film is used for all frames, exposed halfway, or unexposed is explained using an example in which the used state of the film is displayed when the rewinding operation is performed. Alternatively, the display may be performed according to the usage state of the film. For example, the number of exposed frames may be displayed if it is in use.

[0034]

As described in detail above, according to the present invention, the locking member is not required, and when the film cartridge is taken out from the camera, for example, the camera is given a shock such as being accidentally dropped. Even in this case, it is possible to provide a camera that prevents erroneous display of the usage state.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration example of a camera as a first embodiment according to the gist of the present invention.

FIG. 2 is a flowchart for explaining the operation of the camera having the configuration shown in FIG.

FIG. 3 is a view showing a lock mechanism of a light shielding door of a film cartridge.

FIG. 4 is a view showing a rotation lock mechanism of a spool of a film cartridge.

FIG. 5 is a diagram showing a configuration of a light shielding door of a film cartridge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... CPU (Central Processing Unit) 2 ... Film feeding unit 3 ... Film usage state display unit 4 ... Film cartridge chamber lid opening / closing operation member 5 ... Film cartridge chamber lid locking unit 6 ... Film cartridge spool rotation locking member

Claims (3)

[Claims] 1. A camera using a film cartridge provided with a means for displaying a film use state by rotating a cartridge spool, wherein a manual operation member for releasing a lock member of a cartridge chamber lid and a rewind signal in response to the rewind signal. Means for rewinding the film into the cartridge, and, when the manual operation member is operated after the rewinding,
A camera characterized in that the cartridge spool is rotated to set the film use state display means to a predetermined position and then the lock member of the cartridge chamber lid is released. 2. A camera using a film cartridge capable of displaying a usage state of a film, comprising: a film cartridge chamber lid opening / closing operation member; a locking means for locking the film cartridge chamber lid; and a film winding / rewinding means. Then, when the film cartridge is loaded into the film cartridge chamber and the film cartridge chamber cover is closed, the film cartridge chamber cover is locked and after the film rewinding by the film rewinding means is completed, the cartridge chamber cover opening / closing member is opened. When operated, the camera is characterized by driving and stopping the above-mentioned film use state display to the exposed position, locking the rotation of the cartridge spool, and then unlocking the cartridge chamber lid. 3. A camera using a film cartridge capable of displaying a use state of film, comprising: a film cartridge chamber lid opening / closing member, a locking means for locking the film cartridge chamber lid, and a film winding / rewinding means. Then, when the film cartridge is loaded into the film cartridge chamber and the film cartridge chamber lid is closed,
After the film cartridge chamber lid is locked and the film rewinding means has finished rewinding the film, when the cartridge chamber lid opening / closing member is operated, the state of use of the film is changed according to the state of use of the film. A camera characterized in that the film cartridge chamber lid is unlocked after being driven to a position and stopped to lock the rotation of the cartridge spool.