JPH0830841B2 - Motor driven camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICABILITY The present invention attaches and detaches a film inside a camera body,
The present invention relates to a motor-driven camera that has an openable / closable lid part in the exterior of the camera body and rewinds the film by electric drive.

2. Description of the Related Art Various types of camera devices have been put into practical use, in which the film rewinding operation in a still camera is performed by a motor built into the camera. In the conventional device, however, the film rewinding mechanism and the film are installed in the camera body. The opening / closing operation of the lid portion provided on a part of the exterior of the camera body for attachment / detachment is not related to each other.

Problems to be Solved by the Invention However, in the above-mentioned configuration, the photographing is completed,
When the film is rewound into the film case, in the motor-driven camera, when the motor drive power source (battery) is exhausted, that is, when the film rewinding operation is performed with the battery voltage lower than a predetermined voltage, the motor is The motor itself does not rotate during the winding process because the film cannot be rewound due to the film winding load and drive force transmission loss of the film winding mechanism. The user may accidentally open the lid in such a state. As a result, there is a problem that the film taken is exposed.

In view of the above problems, the present invention detects that the number of rotations of the motor is larger than a predetermined value or the current supplied to the motor is smaller than a predetermined value when the film is rewound into the film case by the motor with a built-in camera. By doing
Only when it detects that the rotation load of the motor is smaller than a predetermined value, it is determined that the film has been completely rewound into the film case, and the rotation driving force of the motor is used to unlock the lid, The lid is configured to open automatically, and when the motor stops during rewinding, the lid does not open even if the user accidentally tries to open the lid.
A motor-driven camera in which the film is not exposed to light.

Means for Solving the Problems In order to solve the above problems, the camera device of the present invention is
A motor-driven camera that has a lid part that can be opened and closed on a part of the exterior of the camera body to attach and detach the film to and from the camera body, and rewinds the film by a motor. Locking means for locking the lid part and holding it in a state of being fixed to the camera body, and load detecting means for detecting that the rotational load of the motor is smaller than a predetermined value when the motor rewinds the film, The load detection means includes a structure called release means for releasing the state held by the locking means by the rotational driving force of the motor when detected by the load detection means. There is provided a structure of rotation speed detection means for detecting that the rotation speed is higher than a predetermined rotation speed or current detection means for detecting that the current supplied to the motor is lower than a predetermined value. Those were.

Effect of the Invention With the above-described structure, the present invention detects when the number of rotations of the motor is higher than the predetermined value or when the current supplied to the motor is smaller than the predetermined value when the film is rewound into the film case by the motor with the built-in camera. By doing so, it is judged that the film has been completely rewound into the film case only when it is detected that the rotation load of the motor is smaller than a predetermined value, and the rotation driving force of the motor is used to lock the lid. Since the lid is opened automatically when the motor stops during rewinding, even if the user accidentally tries to open the lid, the lid will not open. It is possible to solve the problem that a person accidentally opens the lid of the camera and exposes the film.

Embodiment A motor-driven camera according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan cross-sectional view of a main part configuration of a motor-driven camera according to an embodiment of the present invention seen from above, FIG. 2 is a rear side view seen from the rear, and FIG. 3 is the same rear. FIG. 4 is a partial cross-sectional view of a rear side surface when viewed further, and FIG. 4 is a partial cross-sectional view of a main part of FIG. 3. In FIG. 1, a shaft 2 is planted in a main body 1, and a rotatable lid portion 3 is fitted on the shaft 2 so that the shaft 2 can be opened outwardly. A motor 5 for automatically winding the film 4 is built in the main body 1. In FIG. 4, a sun gear 11 is fixed to a rotary shaft 5a of the motor 5. Further, a retainer gear 12 is rotatably fitted to the rotary shaft 5a with respect to the rotary shaft 5a.
Has been planted. The pinion gear 14 is rotatably fitted to the shaft 13 and meshes with the sun gear 11. The internal gear 15 is rotatably fitted to the rotary shaft 5a and meshes with the pinion gear 14. That is, the sun gear 11, the retainer gear 12, the pinion gear 14, and the internal gear 15 constitute a differential gear mechanism. The external gear portion 15a of the internal gear 15 is meshed with one reduction gear 19a of the reduction gear group 19 (only a part is shown). The rotational driving force of the motor 5 is transmitted to the rewinding gear 20 via the reduction gear group 19 (only a part is shown) or to the roller 6 via a clutch mechanism (not shown). In FIG. 3, a slit portion 20a is provided at one end portion of the rewinding gear 20, and the film cartridge 7 fits into the slit portion 20a to form the rewinding gear.
Rotate integrally with 20. As a result, the rotation driving force of the motor 5 causes the roller 6 or the rewinding gear 20 to rotate to wind or rewind the film 4.

FIG. 5 is a plan cross-sectional view of the main configuration of the motor-driven camera as viewed from above. In FIG.
A rotatable locking arm 26 is fitted to the shaft 25 planted in. A pawl portion 26a is provided at one end of the locking arm 26, an elongated hole portion 26b is provided at the other end, and a spring hook 26c is provided at the center portion.
A tension spring 28 is stretched between a spring hook 27 provided on the main body 1 and a spring hook 26c of the locking arm 26, and always urges the locking arm 26 to rotate counterclockwise. The plunger 29 is fixed to the main body 1, and the pin 31 provided on the actuator 30 of the plunger 29 has a long hole portion 26b of the locking arm 26.
When the plunger 29 is energized, the actuator 30 is attracted and moves to the left, and the tension spring 28
The locking arm 26 is rotated clockwise against the force. In FIGS. 4 and 5 (b), the internal gear 15 is provided with the end face cam portion 15b and the convex portion 15c, and when the internal gear 15 is rotated in the clockwise direction, the convex portion 15c is formed. The rotation of the internal gear 15 is stopped by being locked by the claw portion 26a, and the rotational driving force of the motor 5 starts rotationally driving the retainer gear 12. A cam gear 16 having a cam portion 16a meshes with a tooth portion 12a of the retainer gear 12, and at the same time, the cam gear 16 also starts to rotate.

Further, in FIG. 1, a film retainer 9 is installed on the lid portion 3 via a leaf spring 8. By closing the lid portion 3, the film force is pressed flatly by the spring force of the leaf spring 8. I have to.

Further, in FIG. 3, a reflection plate 21 fixed to the rewinding gear 20 and integrally rotated is provided at the other end of the rewinding gear 20, and the light emitting portion 22a is provided on the main body 1 at a position facing the reflection plate 21. A photo sensor 22 having a light receiving portion 22b is installed. The photo sensor 22 operates only when the main switch 23 shown in FIG. 2 of the camera device is ON.
FIG. 6 is a plan view of the reflection plate 21, and FIG. 7 is a cross-sectional view of essential parts of the reflection plate 21 and the photo sensor 22. As shown in FIG. 6, the reflecting plate 21 is provided with reflecting portions 21a and non-reflecting portions 21b for reflecting the light 24 alternately in the rotating direction. Then, as shown in FIG. 7, if the facing portion of the photo sensor 22 is the reflecting portion 21a, the emitted light 24 is reflected and sent to the light receiving portion 22b. If the facing portion of the photo sensor 22 is the non-reflecting portion 21b, the emitted light 24 is not reflected and the light 24 is not sent to the light receiving portion 22b. Therefore, when the reflection plate 21 rotates while emitting light from the light emitting unit 22a, the pulsed light 24 is input to the light receiving unit 22b, and a pulsed signal is obtained as the output of the photo sensor 22. When the film 4 is completely rewound on the film cartridge 7, the rotational load of the motor 5 is smaller than that when the film 4 is rewound, the number of rotations of the motor 5 is increased, and the frequency of the pulse signal is also increased. Therefore, if the predetermined frequency is set in the eye slightly higher than the frequency when the motor 5 is winding the film 4, it is detected that the frequency obtained by the photo sensor 22 is higher than the predetermined frequency. By doing so, it can be determined that the film 4 has been completely rewound on the film cartridge 7.

FIG. 8 is a sectional side view of a main part of a lock mechanism for locking the lid part 3 to the main body 1, and FIG. 10 is a plan view of the main part of the lock mechanism for locking the lid part 3 to the main body 1. 11 is a side view of the slider 32, and FIG. 12 is a rear view of the slider 32. In Fig. 12, a groove is formed on the back surface of the slider 32.
32a is provided, and the groove 32a is fitted to the rail 1b provided on the main body 1 as shown in FIG. 10 (a). In addition, the slider 32 has a gap provided in the main body 1 as shown in FIG. 8 (d).
It is fitted to 1c, and the slider 32 can slide in the direction of arrow A in FIG. 10 (a) by the rail 1b and the gap 1c. As shown in FIG. 10, the slider 32 is provided with a spring receiving portion 32b, and the leaf spring 33 provided on the main body 1 is pressed against the spring receiving portion 32b to urge the slider 32 in the arrow B direction. However, the main body 1 in FIG.
End face 1e of the window portion 1d provided on the end face 32e provided on the slider 32
Are abutted against each other so that they cannot move in the direction of arrow B from the positions shown in FIGS. 8 (a) and 10 (b). The switch 36 is OFF when the slider 32 is at the position shown in FIG. 10A, but it is turned ON when it is moved to the position shown in FIG. 10B. Further, as shown in FIG. 10 (a), a shaft 34 is fixed to the bearing portion 1f provided on the main body 1. A rotatable latch lever 35 is loosely fitted on the shaft 34, and is biased by a torsion coil spring (not shown) in a clockwise direction in FIG. 8 (d). A pawl portion 35a is provided at the tip of the latch lever 35, and the slider 32a
As shown in FIG. 11, a claw portion 32c that engages with the claw portion 35a is provided, and the claw portion 35a of the latch lever 35 prevents the slider 32 from moving in the arrow B direction.

FIG. 9 is a cam curve diagram showing the cam curve of the cam portion 16a of the cam gear 16. As shown in FIGS. 8, 11, and 12, one end of the slider 32 is in contact with the cam portion 16a. An arm portion 32f that contacts or separates is provided, and when the motor 5 rotates in the counterclockwise direction, the cam gear 16 rotates in the clockwise direction, so that the slider moves along the cam curve shown in FIG.
32 is also configured to move in the direction of arrow A. Also motor 5
Is rotated in the clockwise direction, the cam gear 16 is rotated in the counterclockwise direction, the arm portion 32f contacts the end surface 16b of the cam portion 16a in FIG. 4, and the rotation of the cam gear 16 is locked. The rotational driving force of is output to the internal gear 15.

Also, the main switch of the motor-driven camera shown in FIG.
When it is detected that the output pulse frequency from the photo sensor 22 is higher than the predetermined pulse frequency while 23 is ON, the motor 5 is temporarily stopped by the control circuit (not shown) and the plunger 29 is energized. After that, the motor 5 is rotationally driven in the opposite direction. After that, when the switch 36 is turned on, the motor 5 is stopped again after a predetermined time has passed, and the energization of the plunger 29 is also stopped.

Further, as shown in FIG. 8 (d), the lid portion 3 is provided with a claw portion 3a, an end surface 3b, and an opening portion 3c. When the lid portion 3 is closed, the leaf spring 33 causes the slider 32 to move in the arrow B direction. The claw portion 32 that has been moved and is provided on the slider 32 as shown in FIG.
The claw portion 3a is locked by d, and the lid portion 3 cannot be opened.

The operation of the motor-driven camera having the above structure will be described.

First, the state in which the lid 3 is opened for mounting the film 4 on the motor-driven camera will be described. In this state, as shown in FIGS. 8 (d) and 10 (a), the lid portion 3
Is separated from the main body 1, and the slider 32 is biased in the direction of arrow B by the leaf spring 33, but is locked by the claw portion 35a of the latch lever 35, and is prevented from moving in the direction of arrow B. ing. At this time, the cam gear 16 is stopped at a position where the arm portion 32f of the slider 32 and the cam surface 16c of the cam portion 16a are separated from each other as shown in FIG. 8 (d).

Next, when the film 4 is attached to the main body 1 and the lid 3 is closed, as shown in FIG. 8 (c), the end surface 3b of the lid 3 contacts the tip 35b of the claw 35a of the latch lever 35. Start contact.
When the lid 3 is further closed, the end surface 3b gradually presses the claw portion 35a, and the latch lever 35 rotates counterclockwise as shown in FIG. The engagement between 35a and the claw portion 32c of the slider 32 is released. When the lock is released, the leaf spring 33 moves the slider 32 to the position shown in FIG. 10 (b), and the end face 1e is brought into contact with the end face 32e to stop the movement. At the same time, the claw portion 32d enters into the opening 3c. The state is shown in FIGS. 8 (b) to 8 (a).
Is. Therefore, when the lid 3 is stopped from closing, the lid 3 is pushed back in the opening direction by the reaction force of the leaf spring 8 shown in FIG. 1, but the claw portion 32d locks the claw portion 3a, and FIG. As shown in d), the lid 3 is locked and cannot be opened.

Next, in the state shown in FIG. 8 (a), the user takes a picture. However, in the state shown in FIG. 8 (a), the lid portion 3 is locked. regardless of,
Even if the lid portion 3 is accidentally opened, the lid portion 3 is configured not to be opened, so that the photographed film is not exposed.

Next, when the user finishes photographing and becomes unable to wind the film 4, the user rotates the motor 5 clockwise by a control circuit (not shown). Then, the retainer gear 12 also starts to rotate in the clockwise direction, but since the slider 32 is at the position shown in FIG. 8 (a), the end face 16b is attached to the arm portion 32f.
Are contacted and locked, and the rotation of the cam gear 16 is stopped. Then, the rotational driving force of the motor 5 is transmitted to the internal gear 15, and is transmitted to the rewinding gear 20 via the reduction gear group 19 (only a part is shown) to rewind the film 4. At this time, since the plunger 29 is not energized, the locking arm 26 is rotated in the counterclockwise direction by the tension spring 28 as shown in FIG. 5 (a) to lock the convex portion 15c. There is no.

By the way, in a motor-driven camera, when the motor driving power source (battery) is exhausted, that is, when the film rewinding operation is performed in a state where the battery voltage is lower than a predetermined voltage
The motor cannot generate a predetermined rotational driving force, and the motor itself may not be rewound due to the film winding load or the drive force transmission loss of the winding mechanism. If the user mistakenly thinks that the rewinding has ended and mistakenly tries to open the lid portion 3 in such a state, the lid portion 3 is locked and cannot be opened. There is no need to expose the film you shoot.

Next, when the rewinding of the film 4 is completed by the motor 5, the rotational load of the motor 5 is reduced, the rotational speed of the motor 5 is increased, the frequency of the pulsed signal is increased, and at this time the main switch 23 is in the ON state. Therefore, the control circuit (not shown) and the photo sensor 22 detect that the frequency is higher than a predetermined frequency, and the control circuit (not shown) temporarily stops the motor 5 and energizes the plunger 29. Moves to the left as shown in FIG. 5 (b), and the locking arm 26 rotates clockwise. afterwards,
When the motor 5 is driven to rotate counterclockwise, the internal gear 15 starts rotating clockwise. However, it is locked by the claw portion 26a of the locking arm 26, and the rotation of the internal gear 15 stops. As a result, the rotational driving force of the motor 5 is the retainer gear.
Then, the cam gear 16 starts to rotate in the clockwise direction, and the slider 32 starts to move in the direction of arrow C along the cam curve. When it moves to the position shown in FIG. 8 (b) and FIG. 10 (a), the claw portion 3a is disengaged from the claw portion 32d, and at the same time, the latch lever 35 is twisted by a coil spring (not shown) to make a timepiece. Is rotated in the direction, and the claw portion 35a becomes the claw portion 3
2c is locked and the state shown in FIG. 8 (d) is reached. As a result, the lid 3 is automatically unlocked. At the same time, since the switch 36 is turned on, the E portion of the cam curve shown in FIG. 9 comes to a position facing the arm portion 32f by rotationally driving the motor 5 for a predetermined time. Then, the motor 5 is stopped again, the energization of the plunger 29 is stopped, and the state shown in FIG.

When the lid 3 is locked while the film 4 is not attached to the main body 1, a sub switch (not shown) is provided in a place where it is usually difficult for the user to touch the sub switch. By turning on the sub switch (not shown), the control circuit (not shown) first energizes the plunger 29 and then drives the motor 5 to rotate in the counterclockwise direction. When it is turned on, the motor 5 is stopped again after a predetermined time has elapsed, and the energization of the plunger 29 is stopped so that the lid portion is detected in the same manner as when it is detected that the rotation speed of the motor 5 is higher than a predetermined value. The lock of 3 can be released automatically.

Next, a motor-driven camera according to another embodiment of the present invention will be described with reference to the drawings.

In another embodiment of the present invention, the value of the current supplied to the motor 5 is detected instead of detecting the rotation speed of the motor 5 of the above-described embodiment. FIG. 13 is a block diagram of essential parts relating to a motor current detection unit of a motor-driven camera according to another embodiment of the present invention, and FIG. 14 is an explanatory diagram of the output of the comparator of the motor current detection unit. In FIG. 13, when power is input to the power input terminal 40, the motor 5 is rotationally driven via the motor drive circuit 41. A resistor Ra having a very small resistance value is provided in the path as shown in FIG. Further, the two voltages are compared, and a comparator 42 having different output voltages depending on the magnitude is provided, a voltage applied to the resistor Ra is input to one input terminal, and a predetermined voltage Ea is input to the other input terminal. . Therefore, assuming that the current supplied to the motor 5 is Ia, the voltage Eb input to one input terminal is (Ia) × (Ra), and when the voltage Eb is larger than the voltage Ea, the output terminal 43 of the comparator 42 is 14 outputs a high voltage (H signal) as shown in FIG. 14, and when the voltage Eb is smaller than the voltage Ea, a low voltage (L signal as shown in FIG. 14) is output to the output terminal 43 of the comparator 42. ) Is output. However, when the film 4 is completely rewound on the film cartridge 7, the rotational load of the motor 5 is smaller than when the film 4 is rewound, and the current flowing through the motor 5 is reduced. Therefore, if the predetermined voltage Ea is set on the eye slightly larger than the voltage when the motor 5 is winding the film 4, it is confirmed that the signal obtained from the output terminal 43 of the comparator 42 becomes the L signal. By detecting, it can be determined that the film 4 is completely rewound on the film cartridge 7.

Therefore, instead of detecting the number of rotations of the motor 5 of the above-described embodiment, the current value supplied to the motor 5 is detected, and the control circuit (not shown) similarly causes the plunger to move.
By controlling the motor 37 and the motor 5, it is clear that the same effects as the above-mentioned effects can be sufficiently exerted.

As described above, in the motor driven camera according to the present invention, the film is attached to and detached from the inside of the camera body. Therefore, the camera body has an openable / closable lid part to rewind the film by the motor. A motor-driven camera for carrying out, comprising: locking means for locking the lid part by closing the lid part to hold the lid part fixed to the camera body, and rotating the motor when the motor rewinds a film. The load detection unit detects that the load is smaller than a predetermined value, and the release unit detects the load and releases the state held by the locking unit by the rotational driving force of the motor. In addition, the load detection means detects the rotation speed of the motor is higher than a predetermined rotation speed or the current supplied to the motor is a predetermined value. It is composed of a current detection unit that detects that the film size is too small, and when the user accidentally tries to open the lid or rewinds the film after the filming is finished, the motor is used. In the driving camera, when the motor driving power source (battery) is exhausted, that is, when the film rewinding operation is performed in a state where the battery voltage is lower than the predetermined voltage, the motor cannot generate the predetermined rotational driving force, Due to the film winding load and the driving force transmission loss of the winding mechanism, the motor itself may stop rotating during the winding even though the film is not sufficiently rewound. Even if the user mistakenly thinks that the rewinding is finished and tries to open the lid by mistake, the lid does not open, so it is possible to prevent accidental exposure of the filmed film. It is.

[Brief description of drawings]

FIG. 1 is a plan cross-sectional view of a main part configuration of a motor-driven camera according to an embodiment of the present invention as viewed from above, and FIG. 3 is a partial cross-sectional view of the rear side surface, also seen from the rear, FIG. 4 is a partial cross-sectional view of an essential part of FIG. 3, and FIG. 5 is a top view of a motor-driven camera according to an embodiment of the present invention. FIG. 6 is a plan sectional view of a reflection plate according to an embodiment of the present invention. FIG. 7 is a cross-sectional view of a reflection plate and a photo sensor according to an embodiment of the present invention. FIG. 9 is a side sectional view of a main part of a lock mechanism for locking a lid portion to a main body in an embodiment of the present invention, FIG. 9 is a cam curve diagram showing a cam curve of a cam portion of a cam gear, and FIG. Similarly, a plan view of the main part of a lock mechanism for locking the lid part to the main body, FIG. 11 is an embodiment of the present invention. FIG. 12 is a side view of the slider in FIG. 12, FIG. 12 is a rear view of the slider, FIG. 13 is a block diagram of a main part of a motor current detection unit of a motor drive camera in another embodiment of the present invention, and FIG. FIG. 7 is an output explanatory diagram of the comparator of the motor current detection unit in the example of FIG. 1 ... Main body, 3 ... Lid part, 4 ... Film, 5 ... Motor, 6 ... Roll, 7 ... Film / Patrone, 9 ...
… Film retainer, 12 …… Retainer gear, 15 …… Internal gear, 16 …… Cam gear, 20 …… Rewinding gear, 21 …… Reflector, 22 …… Photo sensor, 23 …… Main switch,
26: Locking arm, 29: Plunger, 32: Slider, 35: Latch lever, 42: Comparator.

Claims (3)

[Claims] 1. A detachable lid is provided on a part of the exterior of the camera body for attaching and detaching the film to and from the camera body.
A motor-driven camera for rewinding a film by a motor, wherein a locking means for locking the lid part by closing the lid part and holding it in a state of being fixed to the camera body, and the motor A load detection unit that detects that the rotation load of the motor is smaller than a predetermined value during rewinding, and a state in which the locking unit is held by the load detection unit that detects the rotation driving force of the motor. A motor-driven camera, characterized in that the motor-driven camera is composed of a releasing means for releasing. 2. The load detection means comprises rotation speed detection means for detecting that the rotation speed of the motor is higher than a predetermined rotation speed, and the rotation detection means detects that the rotation speed of the motor is higher than the predetermined rotation speed. The motor driven camera according to claim (1), wherein the means detects the rotational load of the motor being smaller than a predetermined value. 3. The load detection means comprises current detection means for detecting that the current supplied to the motor is smaller than a predetermined value, and the load detection means detects that the current supplied to the motor is smaller than a predetermined value. By the current detection means detecting,
The motor-driven camera according to claim (1), wherein it is detected that the rotational load of the motor is smaller than a predetermined value.