JP2002014397A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera permitting to configure a motor driving circuit and a brake circuit or a strobe charge permitting circuit. SOLUTION: A common terminal of a switch SHC which is a three-terminal switch is connected with a power source; one terminal (contact Non) except the common terminal is connected with a motor driving circuit B2 for feeding a film; and another terminal (contact Charge) is connected with a brake circuit B3 and a strobe charge permitting circuit B4; when the switch SHC is connected with the contact Non and a motor FM is being driven, a brake circuit B3 disables an electric brake, and the strobe charge permitting circuit B4 inhibits to charge the strobe; on the other hand, when the switch SHC is connected with the contact Charge and the motor FM is not driven, the brake circuit B3 makes possible the electric brake, and the strobe charge permitting circuit B4 permits to charge the strobe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera, and more particularly to a motor drive circuit for driving a film feeding motor, a brake circuit for applying a brake to the motor, a strobe charge permission circuit for permitting or not permitting strobe charging. Related to the equipped camera.

[0002]

2. Description of the Related Art Conventionally, a motor drive circuit for driving a film feeding motor and a return path of a current generated by power generation of the motor are switched between conductive and non-conductive to enable or disable an electric brake (power generation brake). In a camera provided with a brake circuit for performing strobe charging and a strobe charging permitting circuit for permitting or not permitting strobe charging to the strobe circuit, these circuits are independently configured.

[0003]

However, if each circuit is configured independently as described above, a switch for switching the operation of each circuit and a circuit for matching the operation between the circuits are required, and the number of parts is reduced. There was a problem that the cost was high in many cases.

The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a camera which can constitute a motor drive circuit and a brake circuit or a strobe charging permission circuit with a small number of parts.

[0005]

According to one aspect of the present invention, there is provided a motor for feeding a film, a motor driving circuit for driving the motor, and a brake for the motor. A camera equipped with a brake circuit for enabling or disabling the camera, including a common terminal and two terminals other than the common terminal, and any one terminal other than the common terminal is connected to the common terminal, and the other terminal is not connected. Wherein the common terminal is connected to a predetermined potential, one first terminal other than the common terminal is connected to the motor drive circuit, and the other second terminal is the brake terminal. A three-terminal switch connected to a circuit, wherein when the common terminal and the first terminal are connected, the motor drive circuit drives the motor, and the brake circuit operates a brake. The effect, when the common terminal and the second terminal is connected, together with the motor driving circuit does not drive the motor, the brake circuit is characterized in that to enable the brake.

According to a second aspect of the present invention, there is provided a motor for feeding a film, a motor driving circuit for driving the motor, and a strobe charging permission or non-permission for strobe charging of the strobe circuit. In a camera feeding device provided with a circuit, a common terminal and two terminals other than the common terminal are provided, and any one terminal other than the common terminal is connected to the common terminal and the other terminal is switched to non-connection. 3
A terminal switch, wherein the common terminal is connected to a predetermined potential, one first terminal other than the common terminal is connected to the motor drive circuit, and the other second terminal is connected to the strobe charging permission circuit. With a connected three-terminal switch,
When the common terminal and the first terminal are connected, the motor drive circuit drives the motor, the strobe charging permission circuit does not permit strobe charging, and the common terminal and the second terminal When connected, the motor drive circuit does not drive the motor, and the strobe charging permission circuit permits strobe charging.

According to a third aspect of the present invention, there is provided a motor for feeding a film, a motor drive circuit for driving the motor, a brake circuit for enabling or disabling a brake of the motor, and a flash circuit. A camera equipped with a strobe charging permission circuit that permits or does not permit strobe charging, has a common terminal and two terminals other than the common terminal, and any one terminal other than the common terminal is connected to the common terminal. A three-terminal switch in which the other terminal is switched to non-connection, wherein the common terminal is connected to a predetermined potential, one first terminal other than the common terminal is connected to the motor drive circuit, and the other terminal is connected to the other terminal. A second terminal provided with a three-terminal switch connected to the brake circuit and the strobe charging permission circuit; When the drive circuit drives the motor, the brake circuit disables the brake, the strobe charge permission circuit does not permit the strobe charge, and when the common terminal and the second terminal are connected, the motor drive is stopped. The circuit does not drive the motor, the brake circuit enables the brake, and the strobe charging permission circuit permits strobe charging.

[0008] The invention described in claim 4 is the first invention.
The invention according to any one of claims 3 to 3,
The first terminal of the three-terminal switch is connected to the common terminal when a shutter is released, and the second terminal is connected to the common terminal when a predetermined frame is set to an exposure position by film feeding. It is characterized by being connected.

The invention described in claim 5 is the invention according to claim 1, 3, or 4.
The brake circuit is constituted by a field-effect transistor, a return path of a current generated by power generation of the motor is formed between a drain and a source of the field-effect transistor, and a gate of the field-effect transistor is connected to the second gate. The terminal is characterized by being connected to the terminal.

The invention according to claim 6 is the invention according to claim 2, 3, or 4.
The strobe charging permission circuit includes a transistor and a bias circuit, and connects the bias circuit to the second terminal.When the second terminal is connected to the common terminal, the bias circuit turns the transistor on and off. The flash circuit is enabled by applying a current to the flash circuit through an emitter-collector of the transistor when the transistor is turned on, and when the second terminal is not connected to the common terminal, the bias circuit allows the transistor to be charged. Is turned off and strobe charging is not permitted by not supplying current to the strobe circuit.

According to a seventh aspect of the present invention, in the third or fourth aspect of the present invention, the brake circuit comprises a field effect transistor, and a drain-source connection of the field effect transistor is provided. Thereby, a return path of a current generated by the power generation of the motor is formed, a gate of the field effect transistor is connected to the second terminal, and the strobe charging permission circuit includes a transistor and a bias circuit. The bias circuit is connected to the second terminal, and the transistor is turned on by the bias circuit when the second terminal is connected to the common terminal, and the bias circuit is turned on through the emitter-collector of the transistor. Allow strobe charging by applying current to the strobe circuit,
When the second terminal is not connected to the common terminal, the transistor is turned off by the bias circuit and strobe charging is not permitted by not supplying current to the strobe circuit.

According to an eighth aspect of the present invention, in the first, third, fourth, or fifth aspect of the present invention, the motor drive circuit is a control unit other than the three-terminal switch. When the state can be switched to a drivable state where the motor can be driven or a drivable state where the motor is not driven, the common terminal and the second terminal of the three-terminal switch are connected via a resistor. And when the motor drive circuit is in the drivable state, the common terminal is connected to the second terminal by the third terminal.
A current is caused to flow through a terminal switch or the resistor, and when the motor drive circuit is in the drive disabled state, the current flows from the common terminal to the second terminal through any of the three-terminal switch and the resistor. And the common terminal is connected to the first terminal, and when the motor drive circuit is in the drivable state, a voltage drop at the resistor causes the brake circuit to receive a voltage from the common terminal. When a low potential is applied to disable the brake and the motor drive circuit is switched to the drive disabled state, no current flows to the resistor and the potential of the common terminal is applied to the brake circuit. When the brake is enabled and the common terminal is connected to the second terminal, Even when any state or of the drive-disabled state, the common and the potential of the terminal is supplied from said common terminal directly the brake circuit via the three-terminal switch is characterized in that the brake is enabled.

According to a ninth aspect of the present invention, in the second, third, fourth, or sixth aspect of the present invention, the motor drive circuit is configured to control a switch other than the three-terminal switch. When the state can be switched to a drivable state where the motor can be driven or a drivable state where the motor is not driven, the common terminal and the second terminal of the three-terminal switch are connected via a resistor. And when the motor drive circuit is in the drivable state, the common terminal is connected to the second terminal by the third terminal.
A current is caused to flow through a terminal switch or the resistor, and when the motor drive circuit is in the drive disabled state, the current flows from the common terminal to the second terminal through any of the three-terminal switch and the resistor. And the common terminal is connected to the first terminal, and when the motor drive circuit is in the drivable state, a voltage drop at the resistor causes the common charge to be transmitted to the strobe charge permission circuit. When a potential lower than the terminal is applied and strobe charging is not permitted, and when the motor drive circuit is in the drive disabled state, no current flows through the strobe charging permission circuit and strobe charging is not permitted and the common terminal is When connected to the second terminal, when the motor drive circuit is in the drivable state, the common terminal is connected to the second terminal. When a current flows through the strobe charging permission circuit directly through the three-terminal switch, strobe charging is permitted. When the motor drive circuit is in the driving disabled state, strobe charging is performed without current flowing through the strobe charging permission circuit. It is characterized by not being allowed.

According to a tenth aspect of the present invention, in the third aspect, the fourth aspect or the seventh aspect,
The common terminal of the three-terminal switch when the motor drive circuit is switched to a drivable state where the motor can be driven or a non-driveable state where the motor is not driven by control other than the three-terminal switch. And the second terminal are connected via a resistor, and when the motor drive circuit is in the drivable state, a current flows from the common terminal to the second terminal via the three-terminal switch or the resistor. So that when the motor drive circuit is in the drive disabled state, current does not flow from the common terminal to the second terminal through any of the three-terminal switch and the resistor, and the common terminal is In the case where the motor drive circuit is in the drivable state when the motor drive circuit is connected to the first terminal, the voltage of the resistor is used. When the brake circuit is disabled by applying a potential lower than the common terminal to the brake circuit due to the drop and the motor drive circuit is switched to the drive disabled state, no current flows through the resistor and the brake circuit does not flow. When the potential of the common terminal is given to enable the brake and the common terminal is connected to the second terminal, the motor drive circuit may be in either the drivable state or the non-driveable state. Also, when the potential of the common terminal is directly applied to the brake circuit from the common terminal via the three-terminal switch, the brake is enabled, and the common terminal is connected to the first terminal. In the above, when the motor drive circuit is in the drivable state, the strobe charge permitting circuit is instructed by the voltage drop at the resistor. When a potential lower than the communication terminal is applied and strobe charging is not permitted, and when the motor drive circuit is in the drive disabled state, no current flows through the strobe charging permission circuit and strobe charging is not permitted and the common terminal is not allowed. Is connected to the second terminal, and when the motor drive circuit is in the drivable state, a current flows from the common terminal directly to the strobe charge permitting circuit via the three-terminal switch, so that strobe charging is performed. Is enabled, and when the motor drive circuit is in the drive disabled state, no current flows through the strobe charge permission circuit and strobe charging is not permitted.

According to the present invention, by using the three-terminal switch, the operation switching between the motor drive circuit and the brake circuit, the motor drive circuit and the strobe charge permission circuit, and the operation switching between the motor drive circuit, the brake circuit and the strobe charge permission circuit can be performed in one operation. Since the operations are performed simultaneously by one switch, the number of components can be reduced, the circuit configuration can be simplified, and the cost of the circuit can be reduced.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the camera according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is an external view showing an embodiment of an APS camera to which the present invention is applied. AP shown in the figure
A sliding barrier 1 is provided on the camera body 10 of the S camera.
2 is provided, and the barrier 12 is
When the photographic lens 14 is slid from the state in which the photographic lens 4 is covered (the closed state of the barrier 12) to the state in which the photographic lens 14 is exposed (the open state of the barrier 12) as shown in FIG. Become. When the barrier 12 is opened, the finder section 16 and the red-eye reduction lamp 18 are also exposed.

A release button 20 is provided on the upper surface of the barrier 12.
Is arranged, and when this release button 20 is pressed,
You can release the shutter.

At the upper right of the front of the camera body 10, a strobe light emitting section 22 is provided.
When the lever (flash charging display lever) 24 disposed on the upper surface of the camera body 10 is pulled up, the flash is set in a flashable mode (flash firing mode). Lever 2
Light emission is prohibited when 4 is pressed down.

At the bottom of the camera body 10, a cartridge lid 26 is provided as shown by a dotted line in the figure. When the cartridge lid 26 is opened, an APS film cartridge (hereinafter, referred to as "APS film cartridge") is placed in a film cartridge chamber in the camera body 10. (Referred to as a cartridge), or the cartridge can be removed from the film cartridge chamber.

FIG. 2 is a circuit diagram showing the overall circuit configuration of the APS camera. FIGS. 3 to 5 respectively show a first frame set (FFS) when a cartridge is loaded in the camera (FIG. 3). The timings of user action, switch action and camera action during one-frame shooting (single-frame feeding) (FIG. 4) and during auto-rewind (AR / VEI operation) after all-frame shooting (FIG. 5) are shown. It is a timing chart.

The circuit shown in FIG. 2 includes a motor FM for transporting a film, a xenon tube X for charging a strobe, and a light emitting diode D _A for red eye reduction (the red eye reduction lamp 1 in FIG. 1).
8), mark (Fat Bi) indicating print size (C, H, P)
t) incorporates a light emitting diode D _F for FatBit baking the film, and drive these, power supply V1 to control (cell), motor motion circuit A1, STROBE
Circuit A2 (and Timer circuit A3), Akame circuit A4, Fa
The t Bit circuit A5 is constituted by an analog circuit.
The division of each of the circuits A1 to A5 is a rough one,
They are not completely separated for each drive and control target.

The circuit shown in FIG. 3 includes various switches SBA and SA which are linked to a user action or film transport.
R, SP1, SP2, SP3, SFK, SHC, SV
E, SFT, ST OFF1, and ST OFF2 are provided, and the timings of the light emission of the light emitting diode D _A for full-im transport, strobe charging / light emission, red-eye reduction, and light emission of the light emitting diode D _F for Fat Bit are provided by these switches. And so on.

The camera action items shown in FIGS.
In addition, strobe charging is performed by the main capacitor MC in FIG.
Charging, and the timer capacitor is
Sa C _T(Capacitor C_TIs the resistance R_TAnd by the CR timer
The motor control is based on the MOS FET Q shown in FIG.
_SOf FIG. MT + and MT- are
The positive terminal and the negative terminal when the motor FM is rotated forward are shown.

Here, the timing of the switching of the contacts of each switch in FIG. 2 and the outline of the operation thereby will be described.

The switch SBA is connected to the barrier 1 shown in FIG.
The switch is turned on / off in conjunction with the opening / closing operation of No. 2 and is turned on when the user opens the barrier 12 and turned off when the barrier 12 is closed (see FIGS. 3 to 5). Thereby, the battery power supply V1 is supplied to each circuit. Note that a main switch may be provided in the camera so that the switch SBA can be turned on and off by turning on and off the main switch separately from the opening and closing of the barrier 12.

The switch SAR is a switch for switching the connection between the contact F and the contact R in conjunction with the opening / closing operation of the cartridge cover (C cover) 26 shown in FIG. 1 and the detection of the end of the film after all frames have been shot. When the user opens the C cover 26, the motor FM is connected to a contact F that sets the rotation direction of the motor FM to the normal rotation direction (FWD (the direction in which the film is sent out from the cartridge)) (see FIG. 3). Upon detection, the rotation direction of the motor FM is changed to the reverse rotation direction (REW).
(The direction in which the film is rewound into the cartridge)) (see FIG. 5). Therefore, when the C lid 26 is opened, a new cartridge is loaded and the C lid 26 is closed, the rotation direction of the motor FM is set to the normal rotation direction. When the release button 20 is pressed once thereafter, the motor FM
Is driven forward and the first frame set (FFS)
Is executed (see FIG. 3). Also, release button 20
Press to shoot the last frame, and then the motor FM
When the film is pulled out to the end by the normal rotation drive, the motor FM is switched to the reverse rotation drive, and the film rewinding is automatically started (see FIG. 5).

The switches SP1 to SP3 are turned on / off in conjunction with the release button 20 shown in FIG. 1. While the release button 20 is pressed from the released state to the maximum depressed position, the switches SP3 and SP3 are switched. SP2 and switch SP1 are turned on in this order, and until the release button 20 is released from the maximum depressed position,
The switches SP1, SP2, and SP3 are turned off in this order.

The switch SP1, the capacitor of the CR timer mainly switch SFK described later in FFS time limits the time that the motor FM is driven forward remain off (CR circuit composed of a capacitor C _T and the resistance R _T) The timing at which charging of the C _T (timer capacitor) is started (when turned on) and the timing at which time measurement is started by the timer (when turned off) are synchronized with the operation of the release button 20 (see FIG. 3). Switch SP2 is mainly the timing of emission start emitting diode D _A for red-eye reduction (when on) and light emission stop (OFF state), prohibition of film feed by the motor FM (when on) and the start (time off) And the current supply time for permitting the start of strobe charging in the STROBE circuit A2 (time during which strobe charging is permitted). Reset processing start (on time) and reset processing end (off time) of the Timer circuit A3. Is synchronized with the operation of the release button 20 (see FIG. 4). The switch SP3 mainly synchronizes the timing of strobe charging (charging of the main capacitor MC) prohibition (ON) and prohibition release (OFF) timing with the operation of the release button 20 (see FIG. 4).

The switch SFK is a switch which is turned on / off according to the presence or absence of a film on the film transport path. FIG. 6 shows a schematic configuration and an arrangement position. FIG.
FIG. 5 is a perspective view showing a state in which a film F is drawn out from the cartridge 30 onto a film transport path when an APS film cartridge 30 is loaded in the film cartridge chamber of the camera. The drive shafts 32 and 34 shown in FIG. 3 are respectively provided to protrude into the film cartridge chamber and are driven to rotate by a motor FM. When the drive shafts 32 and 34 are loaded with the cartridge 30, respectively. Cartridge 30
And an engaging hole 38 for opening and closing the light shielding cover of the opening 40 of the cartridge 30. The rotation of the drive shaft 34 opens the light shielding cover, and the drive shaft 3
When the spool is rotated by the rotation of 2, and the film F is sent out from the opening 40 of the cartridge 30 onto the film transport path, the film F passes through the range of the aperture AP where the exposure is performed and is wound up on a take-up spool (not shown). Can be The switch SFK is arranged at a position where the film F passes after the aperture AP, as shown in the figure, and when the film F is not at that position, the two contacts a and b of the switch SFK are separated. When the film F is transported to the position of the switch SFK and the film F is at that position, the two contacts a and b come into contact. Therefore, at the time of FFS shown in FIG.
When the leading end of the film F is conveyed to the position of the switch SFK, the switch SFK is turned on from off, while the leading end of the film F is rewound to the position of the switch SFK during the film rewinding (AR / VEI operation) shown in FIG. Switch SFK is turned off from on.

At the time of FFS, after the film transport is started by turning on the switch SP1, the film is correctly fed out of the cartridge 30 and the switch SF is turned on.
When K is switched from off to on, the CR timer driven forward continues motor FM to FFS even after the timer time (constituted timer by the capacitor C _T and the resistance R _T) is completed (Applicable in the case shown in FIG. 3), the film is not correctly fed, and the switch SFK
If the motor remains off, the motor F
The drive stop of M becomes effective. After the drive stop of the motor FM is enabled by this switch SFK, the rotation of the motor FM is actually stopped by a switch SVE described later.

On the other hand, when the switch SFK is switched from on to off at the time of AR, the stop of the reverse rotation drive of the motor FM is stopped after the lapse of the timer time of the CR timer (film F).
(After the tip of is stored in the cartridge 39). In this case, the actual stop of the motor FM is also performed by a switch SVE (described later).

The switch SHC is provided in the film.
Detection of perforation and release button 20 (system
Contact with the contact Finish in conjunction with the
This is a switch whose connection is switched to the point Non. the above
FIG. 6 shows a schematic configuration of a mechanism for detecting perforation.
And an arrangement position. As shown in FIG.
Perforation P on top and bottom of top_a, P_b,
… Are perforated, and these
Resolution P_a, P_bIn a position where
An intermittent (two-tooth) sprocket 50 fixed to the shaft 51 is provided.
Is placed. This intermittent sprocket 50 has two teeth 5
0A, 50B are formed, and these teeth 50A, 5B
0B indicates two consecutive performances of the film F, respectively.
Ration P_a, P_b(Perfore at the end of a frame
Option P_bAnd the perforation at the tip of the next frame
P_a). When the film F is being transported
In addition, perforation P of each frame_a, P_bBetween
-Foration P_a, P _bNo perforated file
Intermittent sprocket 50 for teeth 50)
A, rotating while contacting the peripheral surface other than 50B,
FORATION P_a, P_bIs transported,
-Foration P_a, P_bEngages teeth 50A, 50B
And rotate. Both teeth 50 of the intermittent sprocket 50
A, 50B are perforated P_a, P_bEngages with
Perforation P for intermittent sprocket 50_aWhen
Perforation P_bIs in a symmetrical position,
The frame of the film F is set at the position of the aperture AP.
At the time of FFS and one frame feeding.
Shutter charge is completed.

The switch SHC is linked to the rotation of the shaft 51 of the intermittent sprocket 50, and when the shutter charge is completed, the connection of the contact Non is switched to the connection of the Contact Fin in the circuit diagram of FIG. After that, when the release button 20 is pressed to the maximum depressed position and the shutter is released, the contact Finis
The connection is switched from h to the connection of the contact Non.

As shown in FIG. 3 and FIG.
At the time of frame feeding, when FFS or shutter charge is completed and the connection of the switch SHC is switched from the contact Non to the contact Finish while the motor FM is driven forward, the current supply path to the motor FM is cut off. At the same time, the MOS FET _QBF shown in FIG. 2 is turned on, and a current loop is formed in which the current generated by the power generation of the motor FM is returned. As a result, an electric brake (power generation brake) is applied to the motor FM, and the rotation of the motor FM stops. When the switch SHC is switched from the contact Non to the contact Finish in the state (display) in which the strobe charge display lever 24 is pulled up, the strobe charge is started and the start of the strobe charge is permitted. Timer circuit A3 that limits the current supply time
Is started.

When the release button 20 is pressed to release the shutter and the switch SHC is switched from the contact Finish to the contact Non, the power supply V1 switches to the motor FM.
Is connected, and the motor FM is driven. The reason why the motor FM is actually driven forward for the next shutter charge is that the switch SP2
Is turned off from on in conjunction with the release button 20.

The switch SVE is a switch that is turned on / off in conjunction with the display position of a VEI (Visual Exposure Index) of the APS film cartridge, and is turned off when the display position of the VEI is a cross indicating that the image has been photographed (Exposed). And turned on at other display positions.

The VEI will now be described. As shown in FIG.
0, a square hole 62, a cross-shaped hole 64, and a half-moon-shaped hole 66 are drilled, and a white tongue that rotates integrally with the spool 68 is arranged inside the side surface. ing. The VEI stops the tongue at any one of the round hole 60, the square hole 62, the cross hole 64, and the half-moon hole 66 so that the film is not used. Whether the usage status is “completed” or “developed” is indicated by white marks such as circles, squares, crosses, and half moons. The spool 68 of the cartridge 30 is provided with an engagement hole 72 in which a key groove 70 is formed.
The display position of VEI can be detected by the position of the key groove 70.

Next, a mechanism for detecting the display position of the VEI of the cartridge 30 will be described. In the film cartridge chamber of the camera, as shown in FIG. The rotating shaft 80 that matches the wall member 84 of the film cartridge chamber.
(The rotating shaft 80 is provided with the engagement hole 3 of the spool of the cartridge 30 shown in FIG. 6).
6 shows a drive shaft 32 that engages with the drive shaft 6 or a rotating shaft that is disposed to face the drive shaft 32), and a key 82 is formed on the rotating shaft 80. When loaded into the film cartridge chamber, the rotary shaft 80 engages the spool 68 with the key 82 of the rotary shaft 80 engaged with the key groove 70 of the spool 68.

A conductive member 8 having two contacts 86A and 86B having different distances from the rotating shaft 80 is provided on the rotating shaft 80.
On the outer surface of the wall member 84, annular electrodes 88A and 88B around the rotation shaft 80 are fixed so as to face the contacts 86A and 86B. The two contact points 86A and 86B are provided so that the rotating shaft 80
When the electrode 88 is rotated together with the spool 68,
A and 88B rotate while contacting the electrodes 88A and 88B.
8B is short-circuited. Further, as shown in FIG. 8B showing a plan view of the electrodes 88A and 88B, the outer electrode 88A is provided with an insulating portion 88C in which a part of the electrode is cut out. When the contact 86A rotates, the space between the electrode 88A and the electrode 88B is opened. The position of the insulating portion 88C is a position where the VEI display position of the cartridge 30 becomes a cross mark indicating that the photographing has been completed when the contact point 86A is present at this position, and the position of the spool 68 when the VEI display position becomes the photographed state. The position of the key groove 70, that is,
The position of the key 82 of the rotating shaft 80 and the contact point 8 for the key 82
It is determined by the relationship with the position of 6A. Therefore,
When the display position of the VEI is other than the cross indicating that the photographing has been completed, the electrode 88A and the electrode 88B are in a connected state, and V
When the display position of the EI is a cross indicating that photographing has been completed, the electrode 88A and the electrode 88B are not connected.

The switch SVE is connected to the electrode 88A and the electrode 8A.
8B is a switch having a terminal 8B. With the above-described configuration, the switch is turned off when the display position of the VEI becomes a cross indicating that photographing has been completed, and turned on at other display positions. When the switch SFK is turned off at the time of FFS and AR / VEI and the motor FM can be stopped after the timer time of the CR timer elapses, Motor F
The current supply to M stops, and the MOS FET Q _BF or Q _BR
Is turned on, the electric brake is applied to the motor FM, and the rotation of the motor FM stops.

The switch ST OFF (ST OFF1,
ST OFF2) is a switch that is turned on / off in conjunction with the strobe charging display lever 24. When the user raises the lever 24 (display), the switch S is turned off.
When T OFF1 is turned off and the switch ST OFF2 is turned on and the lever 24 is pushed down (storage),
Switch ST OFF1 is on, switch ST OFF
2 is turned off (see FIG. 4).

When the user lifts the lever 24 to turn off the switch ST OFF1 and turn on the switch ST OFF2, the charging of the main capacitor MC for strobe charging and the charging of the trigger capacitor TC shown in FIG. 2 are permitted (see FIG. 2). 4). The charging is started when the switch SHC is switched from the contact Non to the contact Finish. On the other hand, the user presses down the lever 24, the switch STOFF1 is turned on, and the switch STO is turned on.
When the FF2 is turned off, the charging of the main capacitor MC and the charging of the trigger capacitor TC are prohibited (see FIG. 4).

The switch SFT is a switch that is turned on / off in conjunction with the release button 20, and is turned on / off in synchronization with the release of the shutter when the user presses the release button 20 to the maximum depressed position. Is repeated several times (see FIG. 4). Thereby, the switch S
When the FT is turned on, when the lever 24 is on the display side, a trigger is applied to the xenon tube X from the trigger capacitor TC, the electric charge stored in the main capacitor MC is discharged to the xenon tube X, and the strobe emits light. Also,
When the switch SFT is turned on, the light emitting diode _DF for Fat Bit emits light.

Next, the circuit operation relating to the film transport and the strobe charging will be described. FIG. 9 is a circuit diagram in which circuit elements related to film transport and strobe charging are mainly extracted from the motor motion circuit A1 from the entire circuit diagram of FIG. 2, and is partially simplified.

As shown in FIG. 9, the circuit shown in FIG. 9 includes a film feeding motor FM, a motor control circuit B1, a motor drive circuit B2, a brake circuit B3, a strobe charging permission circuit B4, the STROBE circuit A2, and a switch. It is composed of SHC and the like.

Regarding the switches included in the motor control circuit B1, as described above, the switch SFK is a switch that is turned on / off according to the presence or absence of a film in the film transport path, and the switch SP1 is a release button 20.
A switch that is turned on and off in conjunction with. The switch SVE included in the motor drive circuit B2 is a switch that is turned on / off in conjunction with the VEI display position of the cartridge as described above. The switch SHC is switched to the contact Non side when the release button 20 is pressed as described above, and is switched to a contact Finish (here, referred to as a contact Charge) when the film charging is completed by the film feeding. It is.

By the way, the motor control circuit B1 has a MOS FET Q that switches on and off states depending on the on / off state of the switches SFK and SP1 and the operation state of the CR timer including the capacitor _CT and the resistor _{RT. S} (N
There-channel enhancement type MOS field effect transistor) is, the drain of the MOS FET Q _S - between source is connected in parallel with the switch SVE of the motor drive circuit B2. Therefore, the MOS FET Q _S and the switch SV
E, the states of the motor FM, the motor drive circuit B2, the brake circuit B3, and the strobe charging permission circuit B4 change according to the state of the switch SHC. Therefore, below, MOS FET
Q _S, the switch SVE, explaining the case analysis to circuit operation state of the switch SHC.

First, the case where the MOS FET Q _S is off, the switch SVE is off, and the connection of the switch SHC is at the contact Non will be described. Such a state occurs, for example, in the first frame set (FFS) shown in FIG. 3, when the cartridge is not loaded in the film cartridge chamber of the camera, and the barrier 1
2 (see FIG. 1) is opened and the power is turned on.
Alternatively, after that, when the cartridge is loaded in the film cartridge chamber and the release button 20 is pressed to activate the FFS, the switch SP1 is switched from on to off.

In such a case, the transistor Q1 (PNP bipolar transistor) of the motor drive circuit B2 is off, and the current supply path from the power supply V1 to the motor FM is cut off. Also, the MOS FET Q _BF of the brake circuit B3
The gate of the (N-channel enhancement type MOS field effect transistor) is connected to a common terminal of the switch SHC via a resistor R1.
Since the positive terminal of the power supply V1 is connected to the common terminal of the HC,
High voltage (ON voltage) is applied to the gate of the MOS FET _QBF
Is applied. As a result, the MOS FET _QBF is turned on, and the terminal of the motor FM is connected to the drain of the MOS FET _QBF .
Conduction is made between the sources, and the electric brake becomes effective. Therefore, the motor FM does not rotate and the film is not fed.

On the other hand, since no current flows through the resistor R2 connected between the base and the emitter of the transistor Q2 (PNP bipolar transistor) of the strobe charging permission circuit B4, the transistor Q2 is turned off. Therefore, ST
A current for starting strobe charging does not flow through the ROBE circuit A2, and strobe charging is not permitted.

Next, the MOS FET Q _S is turned off, the switch SVE is turned off, and the connection of the switch SHC is changed to the contact Charg.
The case where e is described will be described. Such a state occurs, for example, when one frame is fed as shown in FIG. 4, when the film charge is completed and the connection of the switch SHC is switched to the contact Charge, the display position of the VEI of the cartridge happens to be. In the case where the switch SP1 is turned on when the release button 20 is pressed in the next shooting when the camera stops at the position where the cross mark indicating that shooting has been completed is performed, and before the connection of the switch SHC is changed to the contact Non. It is.

In such a case, the current supply path from the power supply V1 to the transistor Q1 of the motor drive circuit B2 is cut off, and the current supply path from the power supply V1 to the motor FM is cut off. Further, since the contact Charge gate and switch SHC of MOS FET Q _BF brake circuit B3 are short-circuited to the gate of the MOS FET Q _BF, High Voltage (on-voltage) is applied, MOS FET Q _BF is It turns on and the electric brake is activated. Therefore, the motor FM does not rotate and the film is not fed.

On the other hand, a resistor R2 connected between the base and the emitter of the transistor Q2 of the strobe charging permission circuit B4
, No current flows, so the transistor Q2 is turned off. Therefore, the current for starting the flash charging does not flow through the STROBE circuit A2, and the flash charging is not permitted.

Next, a case where at least one of the MOS FET Q _S and the switch SVE is turned on and the connection of the switch SHC is a contact Non will be described. Such a state is caused, for example, by pressing the release button 20 to start FFS at the time of FFS shown in FIG.
After P1 switches from ON to OFF, until the first frame is set to the exposure position by the film transport and the connection of the switch SHC switches to the contact Charge, or at the time of one frame feeding shown in FIG. When the switch SP1 is switched from on to off when the release button 20 is released after the release button 20 is pressed for photographing, the next frame is fed to the exposure position and the switch SHC is connected. This is until switching to the contact Charge.

In such a case, a current flows from the power supply V1 between the base and the emitter of the transistor Q1 of the motor drive circuit B2, turning on the transistor Q1 and conducting the current supply path from the power supply V1 to the motor FM. . Further, a current flows through the resistor R1 and the resistors R2 and R3 of the strobe charging permission circuit B4, and the voltage drop at the resistor R1 is larger than the voltage drop at the resistors R2 and R3. _A low voltage (off voltage) is applied to the gate of _BF , and the electric brake is turned off. Therefore,
The motor FM rotates to feed the film.

On the other hand, the resistance R of the strobe charging permission circuit B4
The voltage drop at 2 does not reach the voltage for turning on the transistor Q2 because the voltage drop at R1 is large, and the transistor Q2 is turned off. Therefore, STRO
The current for starting strobe charging does not flow through the BE circuit A2, and strobe charging is not permitted.

FIG. 10 is a diagram showing a bias circuit of the transistor Q2 of the strobe charging permission circuit B4 in this case. As shown in FIG.
Assuming that the current I flows through 1, R2, and R3, the following holds: V1 = (R1 + R2 + R3) .I Since the emitter-base voltage VEB of the transistor Q2 is R2 · I, VEB = R
2 / (R1 + R2 + R3) .V1.

Here, assuming that the emitter-base voltage VEBON for turning on the transistor Q2 is given by: VEB = R2 / (R1 + R2 + R3) .V1 <VEBO
Since the resistors R1, R2, and R3 are set so as to be N 2, the transistor Q2 is turned off as described above.

Next, a case will be described in which at least one of the MOS FET Q _S and the switch SVE is turned on and the connection of the switch SHC is a contact Charge. Such a state is caused, for example, by the F shown in FIG.
At the time of FS, the first frame is set to the exposure position by the FFS, and the connection of the switch SHC is set to the contact C.
After the switching to the charge mode, until the next time the release button 20 is pressed, or during the one-frame feeding shown in FIG.
After the connection is switched to the contact Charge, until the release button 20 is pressed next time.

In such a case, the current supply path from the power supply V1 to the transistor Q1 of the motor drive circuit B2 is cut off, and the current supply path from the power supply V1 to the motor FM is cut off. Further, a High voltage (ON voltage) is applied to the gate of the brake circuit B3, the MOS FET _QBF is turned on, and the electric brake is activated. Therefore, the motor FM
Does not rotate, and no film is fed.

On the other hand, the resistance R of the strobe charging permission circuit B4
2 and R3, the power supply V1 is applied directly without passing through the resistor R1, so that the voltage drop at the resistor R2 is
2 is turned on, and the transistor Q2 is turned on. Accordingly, a current for starting strobe charging flows through the STROBE circuit A2, and strobe charging is permitted.

FIG. 11 is a diagram showing a bias circuit of the transistor Q2 of the strobe charging permission circuit B4 in this case. As shown in FIG.
2. Assuming that the current I flows through R3, V1 = (R2 + R3) .I holds. Since the emitter-base voltage VEB of the transistor Q2 is R2 · I, VEB = R
2 / (R2 + R3) .V1.

Here, assuming that the emitter-base voltage VEBON for turning on the transistor Q2, the resistors R2 and R3 are set so that VEB = R2 / (R2 + R3) .V1> VEBON. Therefore, the transistor Q2 is turned on as described above.

[0065] According to the circuit configuration described above, situations where the motor drive circuit B2 rotates the motor FM, i.e., a connection contact Non of the switch SHC, and, MOS FET of the motor control circuit B1 Q _S or If at least one of the switch SVE is on, the brake circuit B3 is not properly performed the rotation of the motor FM by disabling the electrical braking, the power supply V1 drain of MOS FET Q _BF brake circuit B3 - between the source It prevents meaningless power consumption such as current flowing.

On the other hand, when the motor drive circuit B2 does not drive the motor FM,
In a situation where the rotation of the motor M is stopped, the brake circuit B3 always enables the electric brake to stop the rotation of the motor FM. That is, as described above, when the motor drive circuit B2 supplies current to the motor FM to rotate the motor FM and feed the film, the frame setting (setting of the first frame at the time of FFS or one frame) is performed. When the setting of each frame at the time of feeding is completed and the connection of the switch SHC is switched from the contact Non to the contact Charge, the brake circuit B3 activates the electric brake and immediately stops the rotation of the motor FM. Further, the film cartridge is not loaded in the camera, as none of the MOS FET Q _S and the switch SVE motor control circuit B1 is the connection status (switch SHC as is off is switched to the contact Non In a situation where the motor drive circuit B2 does not drive the motor FM), the brake circuit B3 activates the electric brake to
Prohibit the rotation of M appropriately. Since the brake circuit B3 is constituted by the field-effect transistor as described above, unless the motor drive circuit B2 activates the electric brake while supplying the current to the motor FM, the electric circuit is not activated at other times. Even if the brake is enabled, the power of the power supply V1 is not directly consumed, and the brake control as described above allows the power supply V1 by the brake circuit B4.
1 is prevented from being consumed.

Further, a situation in which the motor drive circuit B2 rotates the motor FM, that is, the switch S
HC is a connection contacts Non side, and, when at least one of the MOS FET Q _S or switch SVE motor control circuit B1 is ON, the flash charge enabling circuitry B4
Does not permit strobe charging, and appropriately prevents the film transport operation by the motor FM from becoming unstable due to the throttle charging.

Similarly, when the switch SHC is connected to the contact No.
n, the motor drive circuit B2 cuts off the current supply path to the motor FM and does not drive the motor FM, that is, when the film cartridge is not loaded in the camera, the motor control circuit B2. MO of B1
S In situations where none of the FET Q _S and the switch SVE is turned off, flash charging permission circuit B4 does not allow the flash charging, so that meaningless flash charging when the cartridge is not loaded is not performed To save power. Also, in this case, no current flows through the resistors R2 and R3 of the strobe charging permission circuit B4, so that no power is consumed by the strobe charging permission circuit B4 itself.

On the other hand, a situation in which the motor drive circuit B2 stops the rotation of the motor FM which has been driven up to that time, that is, the motor drive circuit B2 supplies current to the motor FM and outputs the motor FM Is rotated to feed the film, the frame setting (setting of the first frame at the time of FFS or setting of each frame at the time of one frame feeding) is completed, and the connection of the switch SHC is changed from the contact Non to the contact Char.
When the mode is switched to "ge", the flash charging permission circuit B4 permits flash charging. In this way, the flash charging is performed after the film is fed, which is expected to be photographed later, so that power consumption due to the flash charging being performed even when the photographing is not performed is prevented as much as possible. Has become.

The above-described circuit configured to realize the above-described circuit operation basically includes a motor driving circuit B2
And a switch SHC and a resistor R1 for realizing required operations of the brake circuit B3 and the strobe charging permission circuit B4.
No special circuit components were added except for. The brake circuit B3 and the strobe charging permission circuit B4 realize the above-described operation by using a predetermined potential generated on a circuit configured for the motor drive circuit B2.
Further, regarding the switch SHC, the motor drive circuit B2
In the above operation, only the three-terminal switch is replaced by the two-terminal switch, but this does not increase the number of switches. Therefore, it can be said that the circuit is constituted by a very simple and inexpensive circuit although a plurality of circuits having different purposes are combined.

The motor control circuit B1 and the switch S
VE is mainly used for film transport and APS during FFS and AR.
It is configured for VEI control in the film cartridge, and these configurations are not limited to the configuration shown in FIG. 9, and can be arbitrarily changed according to the contents of the film transport control. . Further, if it is assumed that the film feeding is not prohibited by the motor control circuit B1, the switch SVE, or a circuit configured in place of the motor control circuit B1 or the switch SVE (a situation where the terminals of the switch SVE are short-circuited), When driving the motor FM (connection to the contact Non) by switching the connection of the switch SHC, which is a terminal switch, disabling the electric brake and stopping the driving of the motor FM without permitting strobe charging. (Connection to the contact Charge) realizes basic film control such as enabling the electric brake and permitting strobe charging. Therefore, the configuration of portions other than the motor control circuit B1 and the switch SVE is configured as follows. The present invention can be used not only for the APS film but also for the film transport control of an arbitrary film.

In the above embodiment, both the MOS FET and the transistor shown as switching elements can be changed to any other type of transistor.

In the above embodiment, the motor drive circuit B2, the brake circuit B3, the strobe charge permission circuit B4
Operation switching can be performed by one three-terminal switch. However, effects such as simplification of the circuit can be obtained by performing operation switching of any two circuits by one three-terminal switch instead of all of these circuits. There is.

[0074]

According to the camera according to the present invention described above, the use of the three-terminal switch enables the motor drive circuit and the brake circuit, the motor drive circuit and the strobe charging permission circuit, the motor drive circuit, the brake circuit and the strobe light. Since the operation of the charging permission circuit is simultaneously switched by one switch, the number of parts can be reduced, the circuit configuration can be simplified, and the cost of the circuit can be reduced.

[Brief description of the drawings]

FIG. 1 is an external view showing an embodiment of an APS camera to which the present invention is applied.

FIG. 2 is a circuit diagram showing an overall circuit configuration of the APS camera.

FIG. 3 is a timing chart showing timings of a user action, a switch action, and a camera action in a first frame set (FFS) when a cartridge is loaded in a camera.

FIG. 4 is a timing chart showing timings of a user action, a switch action, and a camera action during one-frame shooting (single-frame feeding).

FIG. 5 is a diagram illustrating an auto rewind (A) after photographing all frames;
9 is a timing chart showing timings of a user action, a switch action, and a camera action during (R / VEI operation).

FIG. 6 is a perspective view of a film transport path showing a schematic configuration and an arrangement position of a switch SFK and a switch SHC.

FIG. 7 is a perspective view of a cartridge used for describing VEI.

FIGS. 8A and 8B are diagrams showing a schematic configuration of a switch VEI.

FIG. 9 is a circuit diagram showing circuit elements related to film transport and strobe charging extracted from the overall circuit configuration diagram of FIG. 2;

FIG. 10 is a circuit diagram used for explaining the operation of the flash charging permission circuit.

FIG. 11 is a circuit diagram used for explaining the operation of the flash charging permission circuit.

[Explanation of symbols]

B1: motor control circuit, B2: motor drive circuit, B3 ...
Brake circuit, B4 ... Strobe charge permission circuit, SFK,
SP1, SVE, SHC ... switch, Q1, Q2 ... _{transistor, Q S, Q BF ... MOS} FET, FM ... motor

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H020 MA01 MA09 MC59 MC60 MD10 ME03 ME13 2H053 AC21 BA04 2H100 DD12 DD13 DD15

Claims (10)

[Claims] 1. A camera comprising a motor for feeding a film, a motor drive circuit for driving the motor, and a brake circuit for enabling or disabling a brake of the motor. A three-terminal switch, wherein any one terminal other than the common terminal is connected to the common terminal and the other terminal is switched to non-connection,
A three-terminal switch is provided in which the common terminal is connected to a predetermined potential, one first terminal other than the common terminal is connected to the motor drive circuit, and the other second terminal is connected to the brake circuit. When the common terminal is connected to the first terminal, the motor drive circuit drives the motor, the brake circuit disables the brake, and the common terminal is connected to the second terminal. Wherein the motor drive circuit does not drive the motor, and the brake circuit enables the brake. 2. A camera comprising a motor for feeding a film, a motor drive circuit for driving the motor, and a strobe charging permission circuit for permitting or not permitting strobe charging to the strobe circuit. A three-terminal switch including a terminal and two terminals other than the common terminal, wherein any one terminal other than the common terminal is connected to the common terminal, and the other terminal is switched to non-connection,
A three-terminal switch in which the common terminal is connected to a predetermined potential, one of the first terminals other than the common terminal is connected to the motor drive circuit, and the other second terminal is connected to the strobe charging permission circuit. When the common terminal and the first terminal are connected, the motor drive circuit drives the motor, and the strobe charging permission circuit does not permit strobe charging, and the common terminal and the second terminal Wherein the motor drive circuit does not drive the motor and the strobe charging permission circuit permits strobe charging. 3. A motor for feeding a film, a motor drive circuit for driving the motor, a brake circuit for enabling or disabling a brake of the motor, and for permitting strobe charging to a strobe circuit. A camera equipped with a strobe charging permission circuit that does not permit the camera, has a common terminal and two terminals other than the common terminal, and switches any one terminal other than the common terminal to the common terminal and disconnects the other terminal A three-terminal switch,
The common terminal is connected to a predetermined potential, one first terminal other than the common terminal is connected to the motor drive circuit, and the other second terminal is connected to the brake circuit and the strobe charging permission circuit. When the common terminal is connected to the first terminal, the motor drive circuit drives the motor, the brake circuit disables the brake, and the strobe charging permission circuit includes If charging is not permitted and the common terminal is connected to the second terminal, the motor drive circuit does not drive the motor, the brake circuit enables the brake, and the strobe charge permission circuit sets the strobe charge. A camera characterized by allowing. 4. The first terminal of the three-terminal switch,
4. A shutter according to claim 1, wherein said second terminal is connected to said common terminal when a shutter is released, and said second terminal is connected to said common terminal when a predetermined frame is set at an exposure position by film feeding. Any one of claims 3
Camera. 5. A brake circuit comprising a field effect transistor, a return path of a current generated by power generation of the motor is formed between a drain and a source of the field effect transistor, and The camera according to claim 1, 3 or 4, wherein a gate is connected to the second terminal. 6. The strobe charging permission circuit includes a transistor and a bias circuit, and connects the bias circuit to the second terminal. When the second terminal is connected to the common terminal, the strobe charging permission circuit includes a bias circuit. A circuit for turning on the transistor, applying a current to the strobe circuit through an emitter-collector of the transistor to permit strobe charging, and
4. The strobe charging is not permitted by turning off the transistor by the bias circuit when no terminal is connected to the common terminal and not supplying current to the strobe circuit. Or the camera according to claim 4. 7. The brake circuit is constituted by a field effect transistor, a return path of a current generated by power generation of the motor is formed between a drain and a source of the field effect transistor, and a current return path of the field effect transistor is formed. A gate connected to the second terminal, the strobe charging permission circuit includes a transistor and a bias circuit, and the bias circuit is connected to the second terminal; and the second terminal is connected to the common terminal. When connected, the transistor is turned on by the bias circuit, and a current is supplied to the flash circuit through an emitter-collector of the transistor to allow flash charging, and the second terminal is connected to the common terminal. When the transistor is not connected, the transistor 5. The camera according to claim 3, wherein the camera is turned off and strobe charging is not permitted by not supplying current to the strobe circuit. 8. When the motor drive circuit is switched to a drivable state in which the motor can be driven or a non-drivable state in which the motor is not driven by a control other than the three-terminal switch, The common terminal of the switch and the second terminal are connected via a resistor, and when the motor drive circuit is in the drivable state, the three-terminal switch or the resistor is connected from the common terminal to the second terminal. So that current does not flow from the common terminal to the second terminal through any of the three-terminal switch and the resistor when the motor drive circuit is in the drive disabled state. When the common terminal is connected to the first terminal, and the motor drive circuit is in the drivable state, When a voltage lower than the common terminal is applied to the brake circuit due to a voltage drop at the resistor, the brake is invalidated, and when the motor drive circuit is switched to the drive disabled state, a current flows through the resistor. When the brake circuit is supplied with the potential of the common terminal and the brake is enabled, and the common terminal is connected to the second terminal, the motor drive circuit is in the drivable state or the drive state. 2. The brake circuit according to claim 1, wherein in any of the disabled states, a potential of the common terminal is directly applied to the brake circuit from the common terminal via the three-terminal switch to enable the brake. The camera according to claim 3, 4, or 5. 9. When the motor drive circuit is switched to a drivable state in which the motor can be driven or a non-drivable state in which the motor is not driven by a control other than the three-terminal switch, The common terminal of the switch and the second terminal are connected via a resistor, and when the motor drive circuit is in the drivable state, the three-terminal switch or the resistor is connected from the common terminal to the second terminal. So that current does not flow from the common terminal to the second terminal through any of the three-terminal switch and the resistor when the motor drive circuit is in the drive disabled state. When the common terminal is connected to the first terminal, and the motor drive circuit is in the drivable state, When a voltage lower than the common terminal is applied to the strobe charging permission circuit due to a voltage drop at the resistor, strobe charging is not permitted, and when the motor driving circuit is in the driving disabled state, a current is supplied to the strobe charging permission circuit. Does not flow, strobe charging is not permitted, and when the common terminal is connected to the second terminal and the motor drive circuit is in the drivable state, the common terminal is connected via the three-terminal switch. Current flows directly into the strobe charging permission circuit to permit strobe charging, and when the motor drive circuit is in the drive disabled state, no current flows through the strobe charging permission circuit and strobe charging is not permitted. The camera according to claim 2, claim 3, claim 4, or claim 6. 10. When the motor drive circuit is switched to a drivable state in which the motor can be driven or a non-driveable state in which the motor is not driven by a control other than the three-terminal switch, The common terminal of the switch and the second terminal are connected via a resistor, and when the motor drive circuit is in the drivable state, the three-terminal switch or the resistor is connected from the common terminal to the second terminal. So that current does not flow from the common terminal to the second terminal through any of the three-terminal switch and the resistor when the motor drive circuit is in the drive disabled state. When the common terminal is connected to the first terminal and the motor drive circuit is in the drivable state, When a voltage lower than the common terminal is applied to the brake circuit due to a voltage drop at the resistor, the brake is invalidated, and when the motor drive circuit is switched to the drive impossible state, a current flows through the resistor. When the brake circuit is supplied with the potential of the common terminal and the brake is enabled, and the common terminal is connected to the second terminal, the motor drive circuit is in the drivable state or the drive state. In any of the disabled states, the potential of the common terminal is directly applied to the brake circuit from the common terminal via the three-terminal switch to enable the brake, and the common terminal is connected to the first terminal. When the motor drive circuit is in the drivable state, the strobe charging is performed by a voltage drop at the resistor. When a potential lower than the common terminal is applied to the permission circuit and strobe charging is not permitted, and when the motor drive circuit is in the drive disabled state, no current flows through the strobe charging permission circuit and strobe charging is not permitted. When the common terminal is connected to the second terminal and the motor drive circuit is in the drivable state, a current is directly supplied from the common terminal to the strobe charge permission circuit via the three-terminal switch. The flash charging is permitted, and when the motor drive circuit is in the drive disabled state, no current flows through the flash charging permission circuit and flash charging is not permitted. The camera of claim 7.