JPS6144298B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a camera that can select a motor drive device, and more specifically, when the motor drive device is attached to a camera and operated, the motor drive device is a motor drive device that can be used in the camera. If the motor drive device is other than
This invention relates to a camera that puts this motor drive device into a non-operating state.

By closing the operation switch, the motor is rotated and the shutter mechanism of the camera is activated to expose the film. After exposure, the rotational force of the motor is transmitted to the film winding mechanism to expose the film. 2. Description of the Related Art A motor drive device designed to wind a film that has already been wound, that is, a motor drive device exclusively used for single-frame photography, which automatically performs one cycle of shutter release operation, exposure operation, and film winding operation, is well known.

Further, a motor drive device capable of continuous photography is also well known, which continuously performs the cycles of the shutter release operation, exposure operation, and film winding operation.

When the continuous shooting motor drive device is attached to a camera and operated, the shutter release operation, exposure operation, and film winding operation are performed continuously at high speed. Of course, the hoisting mechanism and the like are required to have corresponding strength.

Also, even with the same continuous shooting motor drive device, its operation is at low speed (for example, 2 per second,
If there is a high-speed operation (for example, 10 frames per second) and a high-speed operation (for example, 10 frames per second), it is necessary to provide strength corresponding to each in the same way as above.

However, some cameras are not designed taking into consideration that two types of motor drive devices as described above are installed and used. For example, a camera that uses only a motor drive device for single-frame shooting has a relatively non-durable structure due to its price, etc., and if such a camera is used with a motor drive device for continuous shooting. However, the disadvantage is that the camera may be damaged.

Further, the rotation angle at the time of winding may differ between a camera combined with a motor drive device for continuous shooting and a camera combined with a motor drive device for single frame shooting.

Therefore, in order to solve the above-mentioned drawbacks, for example, some types of cameras have a motor drive device for continuous shooting and the shape of the camera that is used with it, but a motor drive device for single frame shooting and the shape of the camera that is used with it. The shape of the cameras used is different to prevent them from being attached to each other. but,
In this case, parts cannot be used in common,
In addition to increasing production costs, this method also has the drawback of changing the shape of the camera, making it less compatible with accessories other than the motor drive device.

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned conventional drawbacks, an object of the present invention is to provide a motor drive camera to which two types of motor drive devices can be attached, in which one motor drive device can be attached without changing the shape of the camera or the motor drive device. To provide a camera capable of selecting a motor drive device that prevents the motor drive device from operating when one of the above motor drive devices is attached to a camera that should not be used. be.

The present invention will be explained below based on an illustrated embodiment.

FIG. 1 shows a motor drive control circuit of a motor drive device dedicated to single-frame photography, in which a power supply _E1 has an operating switch _S3, a capacitor _C2 , a capacitor _C2 , Resistance R ₄
A series circuit consisting of a driving DC motor M ₁ ,
Transistor, a semiconductor switching element
Series circuit of Q ₁ , diode D ₃ and capacitor
A series circuit consisting of C ₁ and a diode D ₁ is connected to a series circuit consisting of a transistor Q ₂ , a resistor R ₁ and a transistor Q ₃ . The transistor _Q1 is an NPN type transistor, and its collector is connected to the drive coil of the motor _M1 , and its emitter is connected to the negative electrode of the power source _E1 . The base is then connected to the emitter of an NPN transistor _Q4 , which forms the dynamic circuit of the motor _M1 . The above transistor _Q4 is
Its base is connected to the connecting point of the capacitor C ₂ and resistor R ₄ through the resistor R 3, and its collector is connected to the terminal S _{2c of the movable contact piece S 2p of} the film winding switch S ₂ , which will be described _later . ing.

The resistor R ₃ and the capacitor C ₂ form a CR time constant circuit, and this time constant circuit and the transistor Q ₄ form a starting circuit for the motor M ₁ . In addition, a diode D ₂ is connected in parallel with _the resistor R 4, and a resistor R ₅ is connected in parallel with the series circuit of the capacitor C ₂ and the resistor R ₄ , and the diode D ₂ and the resistors R ₄ and R ₅ are , constitutes the discharge circuit of capacitor C ₂ .

The above-mentioned switch _S2 is composed of a changeover switch that responds to the film winding mechanism of the camera.During shutter release operation, the movable contact piece _S2p switches to the fixed terminal _S2b , and film winding is completed. Afterwards, the movable contact piece S _2p is switched to the fixed terminal S _2a and restored. The movable contact terminal S _2c of this switch S ₂ is a connecting contact T for connecting the motor drive control circuit to the mirror interlocking switch S ₁ (see Fig. 2) installed in the camera via a resistor R ₆ . _2a , and one fixed terminal S _2b is connected to
Connected to the emitter of transistor _Q4 above. The other fixed terminal S _2a is connected to the collector of transistor Q ₁ , and the collector is connected to a resistor.
Through R ₂ , it is connected to the connection point of diode D ₃ and capacitor C ₁ . This resistor R ₂ and the diode D ₁ constitute a discharge circuit for the capacitor C ₁ .

The emitter of the transistor _Q3 is connected to the negative electrode of the power source _E1 , and the collector is connected to the base of the PNP transistor _Q2 via a resistor _R1 . This transistor _Q3 and the transistor _Q2 are used as semiconductor switching elements and form a circuit for braking the motor _M1 , and the emitter and collector of the transistor _Q2 are connected to the drive coil of the motor _M1 . By being connected to each other, the transistor Q ₂ is connected in parallel to the motor M ₁ .
Further, the transistor Q ₂ has its emitter connected to the connection contact T _2b and its collector to the anode of the diode D ₃ and also to the connection contact T _2c .

As described above, the motor drive control circuit of the motor drive device for single-frame photography is configured.

Next, an example of a camera in which a motor drive device for continuous shooting and a motor drive device for single frame shooting can be used together will be described.

FIG. 2 is a perspective view showing the main parts of the single-lens reflex camera.

As is well known, a single-lens reflex camera is equipped with a movable mirror 1 located in front of the film surface and inclined at 45 degrees with respect to the photographing optical path. It is rotatably supported by support shafts 2a and 2b passing through the wall. Immediately before the shutter is opened, the mirror 1 rotates around support shafts 2a and 2b and flips up to expose the film surface with photographic light through the shutter. Since the drive mechanism of this movable mirror 1 is well known, detailed explanation thereof will be omitted.

On the right side wall of the movable mirror 1, below where the support shaft 2b is fixed, there is an arm end 4 of a switch opening/closing lever 4.
A pin 3 is firmly planted to be inserted into a long hole 4c drilled in a. The switch opening/closing lever 4 is swingably supported by a fixed member of the camera via a shaft 5 at its middle fulcrum, and a switch opening/closing pin 6 is implanted in the other arm end 4b. This pin 6
An opening/closing member 7 made of an electrically insulating material is fixed to the switch ₁ , and this member 7 is in contact with a movable contact piece _S1b of the mirror interlocking switch S1.

The mirror interlocking switch _S1 has two fixed contact pieces _S1a and _S1c formed of elastic conductive contact pieces, and one movable contact piece disposed between both fixed contact pieces _S1a and _S1c . S _1b , which are fixed to a fixed member of the camera with an insulating material (not shown) interposed between them.

In this case, when the mirror 1 is not flipped up, the opening/closing member 7 attached to the pin 6 is in gentle contact with the movable contact piece _S1b , and the movable contact piece _S1b
is always in contact with the stationary contact piece S _1a due to its own elasticity. Furthermore, when the mirror 1 is flipped up, the opening/closing member 7 is moved by the swinging of the lever 4.
pushes the movable contact piece S _1b to break the contact between the contact pieces S _1b and S _1a , and the movable contact piece S _1b contacts the contact piece S _1c to switch the switch S ₁ .

And each of these contact pieces S _1a , S _1b and S _1c
are respectively connected to connection contacts T _1a , T _1b and T _1c for connecting the switch S ₁ to the motor drive control circuit of the motor drive device described above, thereby forming a switch circuit.

As described above, a camera switch circuit is constructed that can be used with both the motor drive device for continuous photography and the motor drive device for single frame photography.

Next, we will discuss the operation when the above-mentioned camera is equipped with the motor drive device for single-frame photography. _First , when the motor drive device is attached to _the camera, the camera's connection contacts _1c is the connection contact T ₂ of the motor drive device
_a , T _2b and T _2c , respectively. Then, when the power switch S ₄ of the motor drive device is closed, and then the operation switch S ₃ is closed, the time constant circuit of capacitor C ₂ and resistor R ₃ is activated, and the charging current of capacitor C ₂ is transferred to the transistor. The current flows to the base of Q ₄ , and transistor Q ₄ is turned on. When transistor Q ₄ becomes conductive, current flows to the base of transistor Q ₁ , so transistor Q ₁ also turns on. When this transistor Q ₁ becomes conductive, the motor M ₁ is energized and the motor starts rotating. this motor
When _M1 rotates, a shutter mechanism (not shown) is released. Then, as the shutter release operation progresses and the movable mirror 1 is raised, the movable contact piece _S1b of the switch _S1 is switched to the fixed contact piece _S1c . When the switch is switched, the current flows into the camera from the contact T _2b , flows out from the connection contact T _2a via the contacts S _1b and S _1a of the switch S ₁ , and flows through the transistor Q ₁ via the transistor Q ₄ . Since the limiting current supplied to the base is cut off, transistor _Q1 is turned off.
At the same time, the control current that began to flow out of the camera through contact _T2c is connected to the capacitor.
Charge _C1 . This constant charging current of capacitor _C1 turns on transistor _Q3 , and the transistor
Q ₂ conducts. When this transistor Q ₂ becomes conductive, the current to the motor M ₁ is cut off, and the back electromotive force generated across the drive coil of the motor _{M 1 is} short-circuited. Braking is applied to the motor M1, and the rotation of the motor _M1 suddenly stops.

Meanwhile, in parallel with the shutter release operation of the camera, the movable contact piece S _2p of switch S ₂ is connected to the fixed terminal S _2b.
Switch to . Then, when the shutter release operation is completed and the photographing is completed, and the movable mirror 1 is lowered from the up position, the movable contact piece _S1b of the switch S1 _is
switches to the fixed contact S _1a and restores the state, so current flows through the base of the transistor QQ ₁ again,
The transistor is turned on. When this is turned on, the motor _M1 is energized again, so that the motor resumes rotation. motor
When the rotation of _M1 is resumed, the film winding mechanism is activated to wind up one frame of film that has already been photographed. When the film winding operation is completed, the movable contact piece _S2p of the switch _S2 is switched to the fixed terminal _S2a and restored in response to the film winding mechanism. When this is restored, the base current of transistor _Q1 is cut off, so the transistor is turned off. When this turns off, motor M ₁
The drive current of the capacitor is cut off, and the capacitor
Since the charging current of C ₁ flows to the base of transistor Q ₃ , transistors Q ₃ and Q ₂ are turned on again, applying electrical braking to motor M ₁ and abruptly stopping its rotation.

Single-frame photography is performed as described above.

As mentioned above, when a motor drive device for single-frame shooting is attached to a camera that can be used with both a motor drive device for continuous shooting and a motor drive device for single-frame shooting, the motor drive current is As shown by arrow b, the power flows from the motor drive control circuit to the camera switch circuit through the connection contact _T2b , and as shown by arrow c, the power flows from the camera switch circuit to the motor drive control circuit through the connection contact _T2a . .

Next, FIG. 3 shows an electric circuit diagram of a motor drive control circuit of a motor drive device capable of switching between single frame photography and continuous photography.

In Fig. 3, the positive pole of the power source _E2 is known, and the operating voltage supply line _L1 is drawn out through the operation switch _S6 , and the negative pole of the power source E2 is known, and the operating voltage supply line _L1 is connected to the power switch _S5.
A parallel circuit of an electromagnetic relay Y for switching and a diode _D6 , and an NPN for relay switching are connected between the operating voltage supply line _L2 drawn out through the
A series circuit consisting of type transistor Q ₉ and a resistor
A series circuit consisting of R ₁₃ , NPN transistors Q ₈ , and Q ₇ is connected to a series circuit consisting of resistors R ₁₁ , R ₇ , a diode D ₄ , and a switch S ₇ for switching between single-frame shooting and continuous shooting. . In addition, the above power supply
A series circuit consisting of a resistor R ₁₀ and NPN transistors Q ₆ and Q ₅ is connected between the positive electrode of E ₂ and line L ₂ . The transistor Q ₉ serves as a switch that cuts off the operating current to the relay Y, and connects its collector to the coil of the relay Y.
Its emitter is connected to the line L ₂ and its base to the collector of the above transistor Q ₈ . In addition, this transistor Q ₈ is connected to a switch circuit installed in the camera by connecting its collector to a resistor R ₁₃ , its emitter to the collector of a transistor Q ₇ , and its base to a switch circuit installed in the camera via a resistor R ₁₂ . It is connected to a contact point _T3b , and is turned on when the movable mirror 1 of the camera, which will be described later, is not flipped up. The transistor Q ₇ has its emitter connected to the line L ₂ and its base connected via the diode D ₅ to the connection point between the resistances R ₁₁ and R ₇ , which is further connected via the capacitor C _3. and is connected to the collector of the above transistor _Q6 . The above transistor
_Q7 is controlled on and off by a CR time constant circuit consisting of a resistor _R10 and a capacitor _C3 . The transistor Q ₆ has its collector connected to the resistor R ₁₀ , its emitter connected to the collector of the transistor Q ₅ , and its base connected to the resistor R _9.
It is connected to the connection contact _T3b through the transistor _Q8 , and is turned on when the movable mirror 1 of the camera is not flipped up, similar to the transistor Q8 described above. The transistor _Q5 has its emitter connected to the line _L2 and its base to the line _L1 via a resistor _R8 , and is turned on by closing the operating switch _S6 .

The electromagnetic relay Y serves to switch the shutter release switch _S8 that drives the driving DC motor _M2 to _operate the shutter release mechanism.
The fixed terminal _S8a is connected to the positive terminal of the power source _E2 , the fixed terminal _S8b is connected to the line _L2 , and the movable contact terminal _S8c is connected to the fixed terminal _S9a of the film winding switch _S9 . This switch _S9 has its fixed terminal _S9b connected to the line _L2 , its movable contact terminal _S9c connected to the drive coil of the motor _M2 , and connected to the connecting contact _T3c . In response to the film winding mechanism, the movable contact piece S _9p switches to the fixed terminal S _9b during the shutter release operation.
After the film winding operation is completed, the movable contact piece _S9p is switched to the fixed terminal _S9a and restored.

Furthermore, the connecting contact T _3a is connected to the positive pole of the power source E ₂ , and a capacitor is connected in parallel with the motor M ₂ .
C ₄ is connected.

As described above, a motor drive device capable of switching between single-frame photography and continuous photography is configured.

Next, the motor drive device capable of switching between single-frame shooting and continuous shooting was attached to a camera that could be used with both the motor drive device for continuous shooting and the motor drive device for single-frame shooting shown in Figure 2. The operation in this case will be described below.

A motor drive device is attached to the camera, and connection contacts T _1a , T _1b and T _1c of the camera are connected to connection contacts T _3a , T _3b and T _3c of the motor drive device, respectively. Next, when the power switch _S5 of the motor drive device is closed, a charging current flows to the capacitor _C3 of the CR time constant circuit, and the capacitor is charged. This current of charge flows to the base of transistor _Q7 , turning it on. Furthermore, since a control current flows through the camera mirror interlocking switch _S1 to the bases of transistors _Q6 and _Q8 , transistors _Q6 and _Q8 are also turned on. This results in transistors Q ₇ , Q ₈
Since both are conductive, the relay switching transistor _Q9 is turned off, and the switch switching electromagnetic relay Y, which is interlocked with the shutter release switch _S8 , is deenergized.

Next, when operating switch S ₆ is closed, transistor Q ₅ is turned on, so the transistor
Both Q ₅ and Q ₆ become conductive, and the charging voltage of capacitor C ₃ is applied as a reverse voltage to the base of transistor Q ₇ , turning off transistor Q ₇ .
Therefore, the transistor _Q9 is turned on, an operating current flows through the relay Y, and the movable contact piece _S8p of the switch _S8 interlocked with the relay Y is switched to the fixed terminal _S8b . This allows the drive current as a control current to be applied to the motor _M2 to the camera's mirror interlock switch _S1.
The motor _M2 starts rotating, and the rotation of the motor _M2 activates the shutter release mechanism (not shown) of the camera to start the shutter release operation. Then, the movable mirror 1 of the camera is flipped up, the switch opening/closing lever 4 swings around the shaft 5 in the direction shown by the arrow a, and the movable contact piece _S1b of the switch _S1 is pushed down, and the same contact piece is fixed. Separate from the contact piece S _1a , the other fixed contact piece S _1c
come into contact with. As a result, the transistor Q ₆ is turned off and the transistor Q ₇ is turned on, but conversely, the transistor Q ₈ is turned off, so the transistor Q ₉ is kept in the on state, and the relay Y is maintained in the energized state.

Also, when the movable mirror 1 is flipped up and the movable contact piece _S1b of _the mirror interlocking switch S1 is switched to the fixed contact piece _S1c , the flow flows into the camera from the connecting contact _T3a , and from the connecting contact _T3b to the camera. Since the control current flowing out is no longer applied to the motor _M2 , the motor stops.

When the exposure operation to the film is completed and the shutter release mechanism of the camera finishes its operation, the movable mirror 1 descends and returns to its original position, and the mirror interlocking switch _S1 is moved so that the switch opening/closing lever 4 is moved to the shaft 5.
Since the movable contact piece S 1b swings in the direction opposite to the arrow a and returns to its original position, the movable contact piece _S1b moves in the direction opposite to the arrow a.
Can be switched to _1a . As a result, transistors Q ₆ and Q ₈ are turned on, but transistor Q ₇ is turned off, transistor Q ₉ is kept on, and relay Y is maintained in the energized state.

Furthermore, in response to the end of the shutter release operation, the movable contact piece _S9p of the film winding switch _S9 is switched to the fixed terminal _9b , so that the drive current is supplied to the motor _M2 via the camera switch _S1 . energized, motor M ₂ starts rotating, and this motor M ₂
As a result of this rotation, a film winding mechanism (not shown) of the camera is actuated to start the film winding operation.

Now, from this state, the motor drive device is
The following two different operations are performed depending on the switching state of the single-frame shooting/continuous shooting switch _S7 .

(1) When switch S ₇ for switching between single-frame shooting and continuous shooting is closed, that is, when switch S ₇ is switched to single-frame shooting, in this case, transistors Q ₅ and Q ₆ are on, so , the charging charge of capacitor C ₃ is transferred to transistors Q ₅ , Q ₆ , diode D ₄ ,
Discharged through the closed loop of resistor R ₇ . Since the resistance value of the above-mentioned resistor _R7 is selected to be sufficiently smaller than the resistance value of the low resistor _R11 , when the motor _M2 is in the film winding operation, transistor _Q7 is turned on, transistor _Q9 is turned off, and relay Y is turned off. Forced. When relay Y is de-energized, movable contact piece _S8p of shutter release switch _S8 , which is interlocked with relay Y, connects fixed terminal _S8a during film winding operation.
When the film winding operation is completed and the movable contact piece _S9p of the film winding switch _S9 is switched to the fixed terminal _S9a , the motor _M2 is de-energized and stops.

Single-frame photography is performed as described above.

(2) When switch S ₇ for switching between single-frame shooting and continuous shooting is opened, that is, switch S ₇ is switched to continuous shooting. In this case, diode D ₄ and resistor R ₇ are not involved in the circuit operation at all. do not.

From the moment the movable mirror S ₁ of the camera returns to its original position and the transistor Q ₆ turns on, the transistor remains active until the base potential is restored by the time constant of the CR time constant circuit consisting of the capacitor C ₃ and the resistor R ₁₀ .
Q ₇ remains off. Therefore, transistor _Q9 is turned on and relay Y remains energized. After adjusting the resistance value of the resistor R ₁₀ and the capacitance value of the capacitor C ₃ and allowing enough time for the camera to advance the film and release the shutter, the base potentials of the transistor Q ₇ will be equalized. Since the value is set to recover to a value sufficient to turn on the transistor, when the film winding operation is completed, the relay Y is energized and the movable contact piece S _8p of the shutter release switch S ₈ is fixed. Switched to terminal S _8b . Therefore, even if the movable contact piece _S9p of the film winding switch _S9 is switched to the fixed terminal _S9p in response to the end of the film winding operation, the motor _M2
continues to rotate, and the shutter release operation is performed in succession to the film winding operation.

Thereafter, the shutter release operation, exposure operation, and film winding operation are performed continuously as long as the operation switch _S6 is closed, so that continuous photographing is performed in the same way as described above.

As mentioned above, if a motor drive device that can switch between single-frame shooting and continuous shooting is attached to a camera that can be used with both a motor drive device for continuous shooting and a motor drive device for single-frame shooting, The current flows from the motor drive control circuit to the camera switch circuit via the connecting contact _T3a as shown by arrow d, and flows into the camera switch circuit as shown by arrow e.
As shown in , the current flows back from the camera switch circuit to the motor drive control circuit via the connecting contact _T3b .

Therefore, when the motor drive device for single-frame photography shown in FIG. ₁ is attached to the camera shown in FIG. The flow is as follows: piece S _1b - fixed contact piece S _1a - connecting contact T _1a , and the motor drive device that can switch between single-frame shooting and continuous shooting shown in Fig. 3 is used by attaching it to the camera shown in Fig. 2. In this case, the motor drive current flows through the switch circuit in the opposite direction to the above case, from the connecting contact T _1d to the fixed contact S _1a to the movable contact S _1b to the connecting contact T _1b . There is no difference in the function of the switch circuit itself, and if a motor drive device is attached to the camera, the motor drive device will always be activated.

On the other hand, a camera dedicated to single-frame photography is constructed as shown in FIG.

In FIG. 4, the same parts in the camera that can be used with both the motor drive device for continuous shooting and the motor drive device for single frame shooting shown in FIG. abbreviated to In this embodiment, a diode _D7 is connected in the switch circuit of the single-frame photographing camera. This diode _D7 is connected between the fixed contact piece _S1a of the mirror interlocking switch _S1 and the connecting contact _T1a so that the diode connected to the connecting contact _T1a serves as a cathode.

In this way, when the above-mentioned camera is used with the motor drive device for single-frame photography attached,
The connection contacts T _1a , T _1b and T _1c of the camera are connected to the connection contacts T _2a , T _2b and T _2c of the motor drive device.
(See Figure 1) and turn on the power switch.
When S ₄ is closed, the control current flows through the connecting contacts T _2b and T _1b
- Movable contact piece S _1b - Fixed contact piece S _1a - Diode D ₇ -
Since the current flows through the connecting contacts T _1a and T _2a and the diode D ₇ only passes forward current, it does not have any effect on other circuit operations. Therefore, this camera and motor drive device operate in exactly the same way as when a motor drive device for single frame shooting is attached to a camera that can use both the motor drive device for continuous shooting and the motor drive device for single frame shooting. works.

Next, a camera dedicated to single-frame photography as shown in Figure 4 was used.
When the continuous shooting motor drive device shown in FIG. 3 is installed, the camera connection contacts T _1a ,
When T _1b and T _1c are respectively connected to the connecting contacts T _3a , T _3b and T _3c (see Figure 3) of the motor drive device and the power switch S ₅ is closed, the control current is transferred to the connecting contacts T _3a , T _1a. The current attempts to flow into the camera switch S ₁ through the mirror link switch S 1, but it is blocked by the reverse current of the diode D ₇ , and the drive current for the motor M ₂ no longer flows through the mirror interlocking switch S ₁ , so the motor Drive unit does not work.

As shown in Fig. 5, by connecting the diode _D8 in the opposite direction to the camera shown in Fig. 4, the motor drive for continuous shooting can be used without operating the motor drive for single-frame shooting. Of course, it is possible to obtain a camera that operates only the device.

As described above, according to the present invention, the direction of the current flowing into the camera switch circuit of two types of motor drive devices is reversed, and only one diode is added to the camera switch circuit. Since the motor drive device other than the motor drive device that can be used with the camera can be rendered inactive, the conventional drawbacks mentioned at the beginning of the specification can be solved, and there is no difficulty in manufacturing or designing. Very convenient to use, without
A camera capable of screening motor drive devices can be provided.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram showing an example of a motor drive control circuit of a motor drive device for single-frame photography to which the present invention is applied, and FIG. 2 shows a motor drive device for continuous photography and a motor drive for single-frame photography. FIG. 3 is a perspective view showing the main parts of a camera that can be used with the device, and shows an example of a motor drive control circuit of a motor drive device to which the present invention can be switched between single-frame shooting and continuous shooting. The electrical route map, FIG. 4, shows a diagram to which the present invention is applied.
A perspective view showing the main parts of a camera that can only be used with a motor drive device for single-frame photography, No. 5
The figure is a perspective view showing the main parts of a camera to which the present invention is applied and which can be used only with a motor drive device for continuous shooting. 1...Movable mirror, 4...Switch opening/closing lever, _D7 , _D8 ...Diode, _M1 , _M2 ...Motor, _S1 ...Shutter interlocking switch, _T1a , _T1
b , T _1c ... camera connection contact, T _2a , T _2b , T _2
c , T _3a , T _3b , T _3c ... Connection contacts of the motor drive device.

Claims (1)

[Scope of Claims] 1. In a motor drive camera in which two types of motor drive devices having different functions are selectively installed, the motor drive device is disposed inside the camera and operates in conjunction with the opening/closing operation of the shutter. A switch circuit that controls the drive current to the motor of the drive device is connected to a motor drive control circuit installed in the motor drive device through a connecting contact, and one of the two types of motor drive devices and the other are connected. and is characterized in that the direction of the motor drive current flowing into the switch circuit is reversed, and a diode is provided in the switch circuit to allow the drive current to flow only from one direction of the connection contact. Cameras with selectable motor drive devices.