JPH04281436A - Opening and closing device for cartridge chamber cover member of camera - Google Patents

Abstract

PURPOSE:To offer the opening and closing device for the cartridge chamber cover member of a camera capable of opening the cover of a cartridge chamber after a film is rewound to a cartridge when the opening operation of the cover of the cartridge chamber is executed in the course of photographing. CONSTITUTION:A locking means 4 which locks the cartridge chamber cover member of the camera, an operation means 1 which generates the unlocking signal of the means 4 and enables the cartridge chamber cover member to be opened, rewinding means 2 and 3 which rewind the film to the cartridge, detection means 5 and 6a which detect that the rewinding of the film to the cartridge is finished and control means 6 and 6A which control the rewinding means 2 and 3 and the locking means 4 according to signals from the operation means 1 and the detection means 5 and 6a are provided. The control means 6 and 6A allow the rewinding means 2 and 3 to rewind the film in the case that the finish of the rewinding is not detected by the detection means 5 and 6a when the operation means 1 is operated. Then, the locking means 4 is unlocked after the finish of the rewinding is detected by the detection means 5 and 6a.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera cartridge chamber cover opening/closing device.

0002

[Prior Art] Even if the cartridge chamber lid member is accidentally opened during shooting, a locking mechanism is provided on the lid member so that the cartridge chamber lid member will not be opened and the film will not be exposed to light, and the film rewinding will be completed. A camera cartridge chamber cover opening/closing device has been proposed which unlocks this locking mechanism upon detection (for example, see Japanese Patent Application No. 2-37272).

0003

[Problems to be Solved by the Invention] However, in the conventional camera cartridge chamber cover opening/closing device, if the cartridge chamber cover is opened by mistake during shooting, the film is not rewound and the camera is closed. If the camera stops working, there is a risk that the photographer may mistakenly believe that the camera is malfunctioning. In addition, with conventional devices, when taking out film from the camera during shooting, it is necessary to operate the film rewind switch to rewind the film and then open the cartridge chamber cover, making the operation cumbersome. There is also the problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a camera cartridge chamber cover opening/closing device that allows the cartridge chamber cover member to be opened after the film has been rewound into the cartridge when the cartridge chamber cover member is opened during shooting. Our goal is to provide the following.

[0005]

[Means for Solving the Problems] The present invention will be explained with reference to FIG. 1, which is a diagram corresponding to claims. an operating means 1 for generating an unlocking signal 4 to enable opening of the cartridge chamber cover member; rewinding means 2 and 3 for rewinding the film into the cartridge; and a detection means for detecting completion of rewinding the film into the cartridge. 5, 6a and
When the operating means 1 is operated, if the detection means 5 and 6a do not detect the completion of rewinding, the rewinding means 2 and 3 rewind the film, and after the detection means 5 and 6a detect the completion of rewinding, the locking means The above object is achieved by providing the control means 6 for unlocking the door 4. Further, the control means 6A of the patrone chamber cover opening/closing device of the camera according to claim 2 is configured to control the rewinding means 2 and 3 if the detection means 5 and 6a do not detect the completion of rewinding when the operating means 1 is operated. The film is rewound, and when the operating means 1 is operated again after the detection means 5 and 6a detect the completion of rewinding, the locking means 4 is unlocked.

[0006]

[Operation] According to claim 1, when the operating means 1 is operated,
The control means 6 causes the rewinding means 2 and 3 to rewind the film if the detection means 5 and 6a do not detect the completion of rewinding, and unlocks the locking means 4 after the detection means 5 and 6a detect the completion of rewinding. let Further, in claim 2, when the operating means 1 is operated, the control means 6A causes the rewinding means 2 and 3 to rewind the film if the detection means 5 and 6a do not detect the completion of rewinding, and the detection means When the operating means 1 is operated again after the completion of rewinding of steps 5 and 6a is detected, the locking means 4 is unlocked.

[0007] In the section of the means and effects for solving the above-mentioned problems, which explains the structure of the present invention, the reference numerals of the elements of the embodiments corresponding to the reference numerals of each means are used to make the present invention easier to understand. However, the present invention is not limited to the examples.

[0008]

Embodiment FIG. 2 is a block diagram showing the configuration of one embodiment. Reference numeral 1 designates a cartridge chamber cover opening switch (not shown) for opening the cartridge chamber lid of a camera, and 2 a film feeding motor drive circuit that drives the film feeding motor 3 to feed the film. Reference numeral 4 denotes a cartridge chamber lid locking device to be described later, which locks and unlocks the cartridge chamber lid. Furthermore, 5 is a perforation detector such as a photoreflector, which detects perforations on the film. Reference numeral 6 denotes a microcomputer consisting of a CPU and peripheral components such as a counter 6a, which performs various arithmetic processing and operation sequence processing for the camera, and also executes a control program to be described later to control the opening and closing of the cartridge chamber lid. .

FIG. 3 is a perspective view showing the locked state of the cartridge chamber lid locking device 4. As shown in FIG. 41 is a hook provided on the cartridge chamber lid 11, and 42 is a slider that engages with the hook 41. The slider 42 includes guide holes 42a and 42b and a boss 12 provided on the camera body.
, 13 so as to be slidable in the vertical direction in the drawing. A spring 43 is provided between one end 42c of the slider 42 and a boss 14 provided on the camera body, and the slider 42 is urged upward in the drawing by this spring 43. The other end 42d of the slider 42 passes through an electromagnetic solenoid 44, and when the electromagnetic solenoid 44 is energized, the slider 42 overcomes the urging force of the spring 43 and is driven downward in the drawing. At this time, the hook 41 and the slider 42 are disengaged to become unlocked, and the cartridge chamber cover 11 can be opened. Note that, in order to save power consumption of the battery, the power supply to the electromagnetic solenoid 44 is stopped after a predetermined time has elapsed after unlocking. Also,
Although an electromagnetic solenoid 44 is used to drive the slider 42, other actuators such as shape memory alloys may be used.

[0010] Although there is a well-known method for detecting whether the film has been fed out of the cartridge and is in the middle of shooting, or has been rewound into the cartridge, here, By detecting the upper perforation with a perforation detector 5 and counting with a counter 6a, it is possible to count the number of fed frames of the film and to detect whether the film is in the middle of shooting or has been completely rewound. That is, if the value of the counter 6a is 0, the rewinding is completed. Note that a photoreflector may be provided near the cartridge chamber to detect the completion of rewinding the film.

FIG. 4 shows an example of a control program executed by the microcomputer 6. microcomputer 6
starts execution of this control program when the cartridge chamber lid opening switch 1 is turned on. The opening/closing operation of the cartridge chamber cover will be explained with reference to the same figure. In step S1,
It is determined whether the value of the counter 6a is 0 or not, that is, whether or not the film has been rewound into the cartridge. If the film has been rewound, the process proceeds to step S4, and the cartridge chamber lid locking device 4 is set to the unlocked state. , the cartridge chamber lid is made openable, and if not, the process proceeds to step S2. If the film is not rewound into the cartridge during shooting, the film feeding motor drive circuit 2 is controlled to rewound the film in step S2. In the following step S3, it is determined whether or not the film has been rewound into the cartridge. If rewinding is complete, the process proceeds to step S4 and the cartridge chamber lid locking device 4 is unlocked; otherwise, the process returns to step S2.

In this way, when the cartridge chamber lid opening switch 1 is turned on, if the film has not been rewound into the cartridge, the film is rewound, and the cartridge chamber lid is unlocked after the completion of rewinding is detected. Therefore, the operability is improved, and when the cartridge room opening switch 1 is operated in the middle of photographing, unlike the conventional case, the camera does not stop operating and the photographer does not misunderstand that the camera is malfunctioning.

FIG. 5 shows another example of a control program. Similar to the above embodiment, the microcomputer 6 starts executing this program when the cartridge chamber cover opening switch 1 is turned on. First, in step S11, it is determined whether or not the film has been rewound in the cartridge. If the film has been rewound, the process advances to step S15 to unlock the cartridge chamber lid locking device 4, and if the film is in the middle of shooting, step S
Go to step 12 and start rewinding the film. In the following step S13, it is determined whether or not the film has been rewound into the cartridge, and if the rewinding has been completed, the process proceeds to step S14.
Otherwise, the process returns to step S12. In step S14, it is determined whether or not the cartridge chamber lid release switch 1 has been turned on again. If it has been turned on, the process proceeds to step S15 to unlock the cartridge chamber lid locking device 4. If it has not been turned on, the program is executed. end.

In this manner, when the cartridge chamber lid opening switch 1 is turned on, the film in the middle of shooting is rewound into the cartridge, and the cartridge chamber lid opening switch 1 is turned on again, the cartridge chamber lid is unlocked. This improves operability and eliminates the need for a conventional film rewind switch.

The present invention can also be applied to a pre-wind type camera in which the film is wound onto the take-up spool of the camera prior to photographing, and then rewound into the cartridge after each photograph.

In the configuration of the above embodiment, the cartridge chamber lid opening switch 1 acts as the operating means, the cartridge chamber lid locking device 4 acts as the locking means, and the film feeding motor drive circuit 2 acts as the locking means.
The feeding motor 3 constitutes a rewinding means, the perforation detector 5 and the counter 6a constitute a detection means, and the microcomputers 6 and 6A constitute a control means.

[0017]

As explained above, according to the invention of claim 1, if the film is not rewound in the cartridge when the operating means is operated, the film is rewound, and after the completion of rewinding is detected, the cartridge is unwound. The locking mechanism on the chamber lid is now unlocked, which improves operability and prevents the camera from stopping when operating the operating mechanism during shooting, which the photographer misunderstood as a malfunction of the camera. There's nothing to do. According to the invention of claim 2, if the film is not rewound in the cartridge when the operating means is operated, the film is rewound, and when the operating means is operated again after the completion of rewinding is detected, the locking means is activated. Since the film is unlocked, operability is improved and the conventional film rewind switch is no longer necessary.

[Brief explanation of the drawing]

FIG. 1 is a complaint correspondence diagram.

FIG. 2 is a block diagram showing the configuration of one embodiment.

FIG. 3 is a perspective view showing an outline of the cartridge chamber lid locking device.

FIG. 4 is a flowchart showing an example of a cartridge chamber lid opening/closing control program.

FIG. 5 is a flowchart showing another cartridge chamber lid opening/closing control program.

[Explanation of symbols]

1. Patrone chamber lid release switch 2 Film rewind switch 3 Film feeding motor drive circuit 3a Film feeding motor 4 Patrone chamber lid locking device 5 Perforation detector 6. Microcomputer 6a Counter 11 Patrone chamber lid 12, 13, 14 Boss 41 Hook 42 Slider 43 Spring 44 Electromagnetic solenoid

Claims (2)

[Claims] 1. A camera cartridge chamber lid, comprising a locking means for locking a camera cartridge chamber lid member, and an operating means for generating an unlocking signal for the locking means to enable the cartridge chamber lid member to be opened. The member opening/closing device includes a rewinding means for rewinding the film into the cartridge, a detecting means for detecting completion of rewinding of the film into the cartridge, and a detecting means for detecting completion of rewinding by the detecting means when the operating means is operated. and control means for causing the rewinding means to rewind the film if not detected, and for unlocking the locking means after the detection means detects the completion of rewinding. Switchgear. 2. The camera patrone chamber cover opening/closing device according to claim 1, wherein the control means controls the winding if the detection means does not detect completion of rewinding when the operating means is operated. A cartridge chamber cover opening/closing device for a camera, wherein the film is rewound by a rewinding means, and when the operating means is operated again after the detection means detects the completion of rewinding, the locking means is unlocked.