JPS6239389Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a remotely controllable motor drive device.

In recent years, remote-controllable motor drive devices have been provided for cameras in which a winding motor section is directly connected to the camera body, and operating sections such as a release button are provided within a remote control section. Generally, in a motor drive device, when the film can no longer be wound, such as when a predetermined number of films have been wound, or when the film has been folded halfway, etc.
It is necessary to detect this and automatically stop the winding of the film. Therefore, it is necessary to provide such a film end detection means in the remote control section. In this case, the remote control section must transmit a start signal for driving the winding motor to the motor section, and the motor section must transmit a winding signal indicating whether or not the film is being wound normally to the remote control section. Therefore, in a conventional motor drive device with a remote control section, two connection lines are required for signal transmission between the motor section and the remote control section.

Here, since both of these connection lines are not actually used at the same time, the cost of one connection line is wasted in terms of cost.

The object of this invention is to provide a motor drive device in which signal transmission between the motor part and the remote control part takes place via a single bidirectional connection path.

An embodiment of the motor drive device according to this invention will be described below with reference to the drawings. FIG. 1 is a block circuit diagram thereof. The hoisting motor section 1 consists of a hoisting motor 1a and an additional circuit 1b for transmitting and receiving signals. An additional circuit 1b is connected to the signal transmitting/receiving circuit 2 on the remote control section side. The output signal of the signal transmission/reception circuit 2 is supplied to the counter circuit 3 and the decoder driver 4a of the display section 4. The output of the decoder driver 4a is displayed on the display element 4b. The output signal of the counter circuit 3 is supplied to the control circuit 5. Control circuit 5
An output signal from a preset switch 6 for setting the number of shots of the film is also supplied to the control circuit 5, and the control circuit 5 compares both input signals and supplies a corresponding signal to the protection circuit 7a of the warning display section 7. The output signal of the signal transmitting/receiving circuit 2 and the signal from the release switch R are also supplied to the protection circuit 7a. The output signal of the protection circuit 7a is displayed on the display section 7b and is also supplied to the signal transmission/reception circuit 2. A clear pulse is also supplied to the counter circuit 3 and the switching control circuit 7.

The specific structure of the hoisting motor section 1 will be explained with reference to a circuit diagram shown in FIG. One end of the winding motor 20 is connected to a fixed contact of a mirror switch 22, and the other end is connected to a fixed contact of a winding switch 24. The mirror switch 22 is switched to the first movable contact A side when the mirror is not raised, and to the second movable contact B side when the mirror is raised. The winding switch 24 is switched to the second movable contact D side when winding is completed, and to the first movable contact C side when the release operation is completed. The first movable contact A of the mirror switch 22 is the first movable contact E of the direct changeover switch 30.
It is also connected to the second movable contact F of the changeover switch 30 via a series circuit consisting of the release switch 26 and the relay 28. Furthermore, the first movable contact A of the mirror switch 22 is connected to the positive terminal of the drive power source 32, and the negative terminal of the drive power source 32 is connected to the second movable contact F of the changeover switch 30. Here, the driving power source 32 is set to 15 [V]. The changeover switch 30 is switched to the first movable contact E side when the relay 28 is de-energized, and to the second movable contact F side when the relay 28 is energized. Also,
The second movable contact B of the mirror switch 22 is connected to the other end of the hoisting motor 20, that is, to the fixed contact of the hoisting switch 24.

The fixed contact of the mirror switch 22 is connected to the additional circuit 1b.
The second movable contact F of the changeover switch 30 is connected to the base of the transistor _Q1 on the side.
Connected to the emitters of Q ₁ , Q ₂ and Q ₄ . The collector of transistor Q ₁ is connected to the base of transistor Q ₂ , the collector of transistor Q ₂ is connected to the base of transistor Q ₃ , and the collector of transistor Q ₃ is connected to the base of transistor Q ₄ through a series circuit of resistors Ra and Rb. The collector of transistor Q ₄ is connected to the base of transistor Q ₅ . A first movable contact A of the mirror switch 22 is connected to the collectors of transistors Q ₁ and Q ₂ and to the emitters of transistors Q ₃ and Q ₅ . A midpoint between the release switch 26 and the relay 28 is connected to the collector of the transistor _Q5 . resistance
The midpoint between Ra and Rb is connected to connection terminal G, and the emitter of transistor _Q4 is connected to connection terminal H.

The specific configuration of the remote control section will be explained with reference to a circuit diagram shown in FIG. Connection terminals G and H from the hoisting motor section 1 are connected to a signal transmission/reception circuit 2. Connection terminal G is connected to the cathode of diode _D1 and the anode of diode _D2 . Diode D ₁
The anode of is connected to the collector of transistor Q ₆ , and the emitter of transistor Q ₆ is connected to the reference power supply Vcc.
connected to the positive terminal of Here, the reference power supply Vcc is set to 6 [V]. The cathode of diode D ₂ is connected to the anode of the photocoupler PC diode. The base potential of the transistor of the photocoupler PC is controlled by a diode, and its collector is connected to the positive terminal of the reference power supply Vcc, and its emitter is connected to the input terminal of the Schmitt trigger circuit 34. Here, the connection terminal H is connected to the ground line. The output signal of the Schmitt trigger circuit 34,
That is, the output signal of the signal transmitting/receiving circuit 2 is sent to the clock terminal CK of the first stage counter 36 of the counter circuit 3.
Clock terminal of decoder driver 4a of display section 4
CK and input transistor Q ₈ of switching control circuit 7
supplied to the base of The outputs of the first and second stage counters 36 and 38 are supplied to the preset switch 6. Further, the positive terminal of the reference power supply Vcc is connected to the reset terminals R of both counters 36 and 38 via a clear switch CL.

The preset switch 6 has a number of switches corresponding to each output terminal of the counters 36 and 38,
By keeping only the designated switches closed,
When the output of the counter circuit 3 reaches a predetermined value, it becomes conductive. The output signal of the preset switch 6 is sent to a warning display circuit 7 via a control circuit 5 consisting of a NAND gate.
collector of transistor Q ₁₀ in, first movable contact I of release switch R and transistor Q ₇
connected to the base of Further, the output signal of the control circuit 5 is transmitted through an inverter 39 and a voltage dividing resistor.
Supplied to the base of LED drive transistor _Q11 . Release switch R is usually the first movable contact I
When the release button provided on the remote control unit is pushed to the side, the second movable contact is switched to the J side. The second movable contact J of this release switch R
is connected to the base of the transistor _Q9 in the warning display circuit 7, and the fixed contact is connected to the emitter of the transistor _Q7 and the ground line. Further, the fixed contact of the release switch R and the first movable contact I are short-circuited via a resistor. And the transistor
The collector of Q ₇ is connected to the base of transistor Q ₆ .

The decoder driver 4a includes a counter, a latch,
An IC consisting of a clock generator, multiplexer, decoder, driver, etc. drives the display element 4b according to the number of input pulses.

In the warning display circuit 7, the input transistor
The collector of Q ₈ is connected to the collector of transistor Q ₉ . The emitters of transistors Q ₈ and Q ₉ are connected to the ground line. The collector of the transistor _Q9 is connected to the input terminal of the Schmitt trigger 40, and this input terminal is connected to the power supply line via a resistor r.
It is connected to the ground line via an electrolytic capacitor C. The output signal of the Schmitt trigger circuit 40 is RS
It is applied to the set terminal of flip-flop 42. The positive terminal of the reference power supply Vcc is connected to the reset terminal of the RS flip-flop 42 via a clear switch CL, and the output signal of the RS flip-flop 42 is connected to the base of the transistor _Q10 , a diode, and a voltage dividing resistor via a voltage dividing resistor. and connected to the base of transistor _Q11 . transistor
The emitters of Q ₁₀ and Q ₁₁ are connected to the ground line. The light emitting diode LED has an anode connected to the power supply line and a cathode connected to the collector of transistor _Q11 .

One embodiment of the motor drive device according to this invention is constructed as described above, and its operation will be explained next. The release switch 26 in the winding motor section shown in Fig. 2 is an operation switch for when the motor drive device is not controlled remotely, and only while this switch is pressed, continuous shooting can be carried out in the same manner as in the case of remote control described below. will be carried out. Here, the description will be made assuming that the release switch 26 is not pressed, that is, during remote control.
First, in the initial state, the mirror switch 22 is placed on the first movable contact A side because the mirror has not yet been raised.
Since the winding switch 24 has finished winding, it is on the second movable contact D side. Here, when the release button on the remote control section side is pressed, the release switch R shown in FIG. 3 is switched to the second movable contact J side, turning on the transistor _Q7 and turning on the transistor _Q6 . Therefore, a voltage of 6 [V] is applied from the positive terminal of the reference power supply Vcc to the connection terminal G via the transistor Q ₆ and the diode D ₁ . Then, the transistors Q ₄ and Q ₅ are turned on, and the positive terminal of the drive power supply 32 → the emitter of the transistor Q ₅ → the collector of the transistor Q ₅ → the relay 28 → the drive power supply 32
A current loop is formed with the negative terminal of relay 2
8 is energized. By energizing the relay 28, the changeover switch 30 is switched to the second movable contact F side.
Then, the winding motor 20 → the winding switch 24
(Second movable contact D) → changeover switch 30 (second movable contact F) → drive power supply 32 → mirror switch 22
A current loop (first movable contact A)→winding motor 20 is formed, and the winding motor 20 is rotated to perform a release operation. When the mirror rises, the mirror switch 22 is switched to the second movable contact B side, and both ends of the winding motor 20 are short-circuited, so that rotation is stopped. When the mirror switch 22 is switched to the second movable contact B side, the transistor
Q ₃ is turned on, and the drive power supply 32 is connected to the connection terminal G.
A voltage of 15×Rb/(Ra+Rb) [V] is applied from the positive terminal of. In this case, 15×Rb/(Ra+Rb)
The values of the resistors Ra and Rb are set so that ≫6. Therefore, current now flows through diode D ₂ and photocoupler PC. Then, when the mirror descends with the completion of the release operation, the mirror switch 22 is switched to the first movable contact A side, the winding motor 20 is rotated again to wind the film, and the voltage at the connection terminal G is increased to 6 [V] again. becomes. Therefore, the current flowing through the diode D ₂ , the photocoupler PC, and the Schmitt trigger circuit 34 becomes a pulse corresponding to the rise of the mirror. This pulse is counted by the counter circuit 3, and when the count value matches the value preset by the preset switch 6, the output signal of the NAND gate 5 becomes L level. This pulse is also supplied to the decoder driver 4a, and the display element 4b shows the number of times the mirror rises,
In other words, the number of captured images is displayed. Further, the preset value of the preset counter 6 is the number of shots of film that can be taken. Then, when the output signal of the NAND gate 5 becomes L level, that is, when the number of shots of film is reached, this output signal is passed through the inverter 39 to the transistor _Q11.
When the camera is turned on, the light-emitting diode LED lights up to alert the photographer.

Furthermore, when the release button is pressed and the release switch R is switched to the second movable contact J side, the transistor _Q9 is off. Transistor _Q8 is turned on and off according to the output signal of Schmitt trigger circuit 34. That is, while the mirror is rising, an H level signal is supplied from the Schmitt trigger circuit 34, so the transistor _Q8 is turned on. Therefore, during release, resistor r and capacitor C
No current flows through the integrating circuit consisting of capacitor C.
The terminal voltage Vco of is 0 as shown in FIG.
When the release ends and winding begins, the transistor _Q8 is turned off, so the terminal voltage Vco of the capacitor C rises from 0. Then, when the release is started, the terminal voltage Vco decreases to 0 again. During shooting, the terminal voltage Vco repeats the form just described,
If the film ends or gets stuck in the middle, it will not wind any further and the mirror will not work.
Since both transistors Q ₈ and Q ₉ are off, the terminal voltage Vco
increases to the power supply voltage of 6 [V]. Here, the reference voltage Vs of the shot trigger circuit 40 is set to be larger than the terminal voltage Vco during release and smaller than 6 [V]. Therefore, when a predetermined period of time has elapsed since the last release operation, the output of the Schmitt trigger circuit 40 becomes H level and the flip-flop 4
2 is set and transistor _Q10 is turned on.
As a result, the transistors Q ₇ and Q ₆ are turned off, power supply to the motor unit 1 is cut off, and the motor will not rotate even if the release switch R is pressed thereafter. At this time, transistor _Q11 is also turned on,
The light emitting diode LED is lit. This prevents the film from being forced to wind up and prevents the film from being cut. Note that this state can be canceled by pressing the clear switch CL.

As explained above, according to this invention, a signal indicating that winding is impossible due to the end of the film or the film being caught in the middle is supplied from the motor to the remote control, and in response, the remote control causes the motor to stop. It is possible to provide a motor drive device that supplies a signal, then stops the motor regardless of the operation of the release button, and transmits and receives both signals using a single bidirectional signal line. Further, since the number of frames to be photographed and a warning that winding is not possible are displayed on the remote control section, the photographer can know these conditions, which is convenient for photographing.

Note that this invention is not limited to the above explanation, and various modifications such as the structure of the control function of the remote control unit are possible.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the motor drive device according to this invention, Fig. 2 is a specific circuit diagram of its motor section, Fig. 3 is a specific circuit diagram of its remote control section, and Fig. 4 is a voltage waveform diagram showing the operation of the protection circuit. 1a...Hoisting motor, 1b...Additional circuit, 2
...Signal transmission/reception circuit, 3...Counter circuit, 4...
Display section, 5... Control circuit, 6... Preset switch, 7... Warning display circuit, 7a... Protection circuit,
7b...Display element.

Claims (1)

[Scope of utility model registration request] In a remote control motor drive camera comprising a motor drive camera and a remote control unit that are connected to each other via a connection line, the remote control unit connects to a first power source and controls the voltage of the first power source in response to a release operation. a start signal generation circuit that supplies a start signal to the motor drive camera via the connection line; The motor drive camera includes a counter that operates, and a display unit that is connected to the counter and displays the number of shots, and the motor drive camera has a second power supply having a voltage higher than the voltage of the first power supply, and a shutter release operation. and a motor that causes the film winding operation to be performed in one sequence; a switching circuit that connects the second power source to the motor in response to the start signal;
A remote control motor drive camera comprising a winding signal generation circuit that supplies a winding signal based on the voltage of the second power source to the remote control unit via the connection line for each sequence operation.