JPH0815748A - Power supply control device for detection control system - Google Patents

Abstract

(57) [Abstract] [Purpose] The drive control of a movable member or an actuator and the operation control of a detection sensor that monitors the same are performed by software using one control signal from a control device. [Structure] AF drive motor M which is an actuator
And a drive control system by the CPU 8 which is a control device for performing the drive control. Further, a feedback control system by the photo interrupter 12 is provided as an encoder which is a detection sensor for monitoring the driving state of the motor. An automatic power supply control circuit 14 is provided for automatically controlling the power supply of the power required for operating the sensor based on the actuator control output signal output from the CPU. These are provided in the camera body 3, which is the main body of the applicable device. The AF lens 21 that is a movable member that is driven by a motor is provided in the interchangeable lens 1 that is an accessory that is detachably attached to the body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, an operation amount, a displacement amount, an operation position and the like of an actuator by a motor or the like which is a control target driven by a control device and a movable member driven by the actuator. The operating state is monitored by a detection sensor such as an encoder, and the drive state is adjusted and controlled based on the result to drive and control the actuator to be controlled or the movable member driven by this to the target speed or position. The present invention relates to a power supply control device of a detection control system suitable for use in the field of so-called feedback control system.

[0002]

2. Description of the Related Art A power supply control device of this type of detection control system is
For example, cameras, especially autofocus cameras (hereinafter A
In an AF drive control and its feedback control system in an auto focus mechanism (hereinafter referred to as AF) in an F camera), or in an aperture control device used for a single-lens reflex camera, the aperture is started particularly after a release operation and the variation of the aperture diameter is changed. It is used for a drive control mechanism of a movable member such as a diaphragm control mechanism for monitoring and outputting a diaphragm stop signal when a predetermined diaphragm aperture is reached to lock the diaphragm.

In the power supply control device of this type of detection control system, the case of applying it to the AF mechanism of the former AF camera will be briefly described with reference to the block diagram of FIG. It is a lens barrel as an interchangeable lens having, and is detachably mounted by being mounted on the center of the front surface of the camera body 3.

Reference numeral 4 denotes a main mirror which is a half mirror that reflects the light flux from the subject that has passed through the photographic optical system 2 toward the viewfinder optical system 11. The main mirror 4 transmits a part of the light flux and the rear side thereof. AF by sub-mirror 5 of
The focus detection module 6 serving as a sensor is configured to be reflected and guided. The focus detection module 6 is composed of a focus detection system and an image sensor described later.

Reference numeral 7 is an interface circuit provided between the focus detection module 6 and a microcomputer as a control device described later. Here, the microcomputer (hereinafter referred to as CPU) 8 is a so-called one-chip microcomputer that incorporates a timer, an interrupt function, an AD converter, etc., controls the focus detection module 6, and outputs the output data from the AD conversion input. , Calculate the amount of defocus. In the figure, 10 is a main switch of the camera, and when this switch 10 is turned on, the CP
Each unit, here, the AF mechanism is drive-controlled via U8.

That is, a part of the light flux from the subject passes through the photographing optical system 2, then passes through the main mirror 4 and is further reflected by the sub-mirror 5, and the focus detection module arranged at the bottom of the camera body 3. Reach 6. The focus detection module 6 guides the light flux from the focus detection area onto the image sensor by the focus detection optical system and forms a pair of subject images on the light receiving portion provided on the image sensor. Further, the focus detection module 6 performs photoelectric conversion in the light receiving section and generates a subject signal according to the amount of subject light.

The CPU 8 calculates the relative shift amount of the pair of subject image signals, calculates the defocus amount of the photographing optical system 2 based on this image shift amount, and controls the lens driving device 9 to control the photographing lens. Drive to the in-focus state. The details of the focus detection module 6 and the details of the calculation method (algorithm) of the image shift amount or the defocus amount are not directly related here, and there are already many publicly known examples and products. The description will be omitted.

A problem with the AF drive control system described above is the connection between the CPU 8 (microcomputer) and the lens drive circuit 9.

That is, a motor is generally used as a driving source in the lens driving device 9 for driving the lens driving amount corresponding to the image shift amount calculated by the CPU 8. Further, the actual lens driving amount associated with such motor driving is detected by using an encoder formed by an optical detection device such as a photo interrupter as a detection sensor, and this is fed back to the CPU 8 to accurately calculate the lens driving amount. It is in control. The above-described motor drive control and feedback control based on the detection value of the encoder are both performed by the CPU 8.

Here, FIG. 8A shows a light emitting diode 1 which is a typical encoder as the above-mentioned detection sensor.
2a is a circuit diagram of a simple photo interrupter 12 including a phototransistor 12b, and FIG. 1B is a schematic perspective view showing an external appearance of a package in which these are integrated. Photo interrupter 1 which is such an encoder
There are many products already commercialized as 2 and detailed explanations and illustrations thereof are omitted, but so that a disc (not shown) having holes or slits in the periphery passes through the slit of the package. Composed. The disk is mounted on the motor shaft or other shaft connected to it.

On the other hand, the light emitting diode 12a and the phototransistor 12b provided in the package face each other across the slit, and the light emitted from the light emitting diode 12a is shielded a number of times according to the rotation amount of the disk. The phototransistor 12b is turned on / off in synchronization with this.

The load resistor connected to the emitter terminal of the phototransistor 12b converts it into a logic level of high (HI; hereinafter "H") / low (LOW; hereinafter "L"). The transistor 12b outputs a pulse number proportional to the disk rotation amount to the CPU 8. The CPU 8 detects the motor drive amount, the drive speed, and the acceleration based on this signal, controls the drive of the lens, drives the lens to a target position, or drives at the target speed.

Here, when the motor is driven, it is necessary to supply the electric power necessary for the encoder for detecting the motor drive amount to function, and the photo interrupter 1 described above is required.
When it is 2, a current of 5 mA or more is generally required.

By the way, since most of the power sources in cameras are batteries, and it is necessary to extend the battery life as much as possible, the energization of the encoder is stopped when the driving of the motor is finished, or at least almost stopped. It is rational to put it in a state, and it is also practiced by the general public.

FIG. 9 shows an example of the interface between the CPU 8 and the drive circuit of the motor M in the lens drive device 9. Here, since there are four types of drive modes of the motor M: normal rotation, reverse rotation, braking, and stop, the number of control terminals from the CPU 8 is only two, a and b, and the drive circuit has these two terminals a, The control input of b is decoded into the above four modes to drive the motor. In the logic circuit indicated by reference numeral 14 in FIG. 9, control is performed as shown in Table 1 below, for example, according to “H” / “L” of the terminals a and b.

[0016]

[Table 1]

When the photo interrupter 12 is used as an encoder for monitoring the drive amount of the motor M, the CPU 8 outputs a control output from a port c different from the motor control terminals a and b. Here, the photo interrupter 12 detects rotation of the motor M, converts it into a pulse, and feeds it back to the CPU 8. This feedback pulse is an interrupt input (IN
T) or pulse counter (CNT)
It is used for feedback control of the motor M.

In FIG. 9 described above, the light emitting current is supplied to the photodiode 12a of the photo interrupter 12 through the driver transistor Tr. Of course, the port c is set to "H" to supply the current only while the motor is being driven (including the brake), and the port c is set to "L" to save power during the stop. The power consumption of the photo interrupter 12) can be said to be substantially zero, with a very small leak current.

The synchronous control of the motor drive and the power supply to the encoder is processed by software by the control program of the CPU 8.

Further, in a power supply control device of this type of detection control system, as a diaphragm mechanism in a single-lens reflex camera such as the latter and a diaphragm control mechanism thereof, a structure as shown in FIG. 10 is conventionally used. Things are known.

To briefly explain this, reference numeral 1 in the drawing is a well-known interchangeable lens barrel having the photographing optical system 2 (depending on the lens group) as described above, and the lens barrel 1 has a rear end. The part mounting bayonet 1a is detachably mounted on a camera body (not shown) (corresponding to the camera body 3 in FIG. 7 and the like). 3 in the figure
1 is an aperture preset ring provided on the lens barrel 1,
Reference numeral 32 is a diaphragm mechanism.

Here, reference numeral 32a in the drawing is a diaphragm interlocking member for operating the diaphragm mechanism 32, and is structured to narrow the diaphragm when moving upward in the drawing in accordance with the biasing spring 33. Reference numeral 31a is a stopper whose position is determined according to the rotational position of the diaphragm preset ring 31, and the diaphragm can be narrowed down until the interlocking member 32a contacts the stopper 31a.

Further, in FIG. 10, an automatic diaphragm control mode,
Any one of the shutter automatic control mode, the program mode, and the manual mode is input to the CPU 50, which is a microcomputer, by the mode selection means (not shown), and the CPU 50 controls the aperture and shutter according to the input shooting mode. It is like this. In this example, in the automatic diaphragm control mode and the program mode, the CPU 50 electrically and mechanically stops the diaphragm, and in the automatic shutter control mode and the manual mode, the preset ring 31 determines the diaphragm position. ing. Further, reference numeral 51 in the figure denotes a release button that is pressed during a shooting operation.

The problematic part in such a structure is the aperture stop control in the aperture automatic control mode and the program mode. Of these, the control in the aperture automatic control mode will be described below.

First, a configuration for storing the relationship between the number of apertures of the interchangeable lens barrel 1 and the displacement of the aperture interlocking member 32a will be described below. That is, reference numeral 34 in the drawing denotes an aperture operating member (not shown) on the camera body side, which engages with the aperture interlocking member 32a on the lens barrel 1 side when the lens barrel 1 is mounted, and urges the spring 33 at the position shown. Against the bias of
The diaphragm is opened according to the spring 35 having a stronger biasing force.

Numerals 36 to 39 are known narrowing-down driving means, which are charged in the state shown in the drawing in association with the film winding. Reference numeral 40 denotes an interlocking member that connects the diaphragm member 34 and the first lever 36 with the elongated hole 40a and the pin 40b. here,
It is assumed that the aperture preset ring 31 is set to a value corresponding to the minimum aperture diameter when the aperture control mode is selected.

On the other hand, the light beam 41 passing through the open aperture is received by a light receiving element 42 arranged near a penta prism of a finder optical system (not shown), and a value obtained by logarithmically compressing this is output from a photometric circuit 43. This output is CP
It is converted into a digital value by the AD converter A / D built in U50, and the aperture value and shutter time are calculated with reference to data such as film sensitivity, shooting mode, and open F value.

Then, in this state, when the release button 51 abbreviated in FIG. 10 is pressed, the CPU 50 detects this and performs control based on the release operation according to the aperture value and the calculated value of the shutter time at that time.

Explaining such control as follows, first, when the port A is set to LOW for a predetermined time (hereinafter referred to as "L"), the transistor Tr1 causes the diaphragm starting magnet 6 to operate.
0 is excited during this period, the first locking lever 38 is released by the attraction force, and the first lever 36 causes the biasing spring 36
It rotates counterclockwise in the figure by a and pulls the interlocking member 40 to the right in the figure. Then, the diaphragm operation member 34 rotates clockwise in the figure against the biasing spring 35. Thus, the diaphragm mechanism 32 is gradually closed as the diaphragm operating member 34 rotates.

Further, since the port C is also set to "L" at the same time as the port A, the transistor Tr2 is turned on at the same time as the start of narrowing down, and the photo interrupter 61 which is an encoder for narrowing down monitoring is supplied with power. As a result, in the narrowing process, the slit 62a formed around the encoding disc 62 that rotates by engaging with the operating member 34.
Is detected by passing through the photo interrupter 61,
A pulse is generated in proportion to the amount of rotation of the disc.

This pulse is input to the CPU 50, and when the number of pulses corresponding to the aperture amount required to control the aperture value calculated in advance is detected, the aperture locking magnet 63 is excited by the port B for a predetermined time. . Then, the diaphragm locking magnet 63 loses the attraction force of the diaphragm locking stop claw 64, and the stop claw 64 is rotated counterclockwise in the figure by the biasing spring 64a to move to the periphery of the encoding disk 62. It bites into the provided tooth portion 62b to stop its rotation. As a result, the diaphragm is locked. Actually, the energization is performed earlier in consideration of the delay time from the energization of the diaphragm locking magnet 63 to the locking of the diaphragm. In the figure, 6
Reference numeral 5 denotes a diaphragm determination control unit that controls the diaphragm locking magnet 63.

After the above-mentioned narrowing-down control and mirror up, the port C returns to HIGH (hereinafter referred to as "H") in order to stop the power supply to the photo interrupter 61 as an encoder.

Following this, the CPU 50 releases the front curtain and the rear curtain of the shutter with a shutter time interval. When the exposure of the trailing shutter shutter is completed and the exposure is completed, the second locking lever 39 is released by a known mechanism (not shown), and the second lever 37 is rotated clockwise by the biasing spring 37a to hit the contact portion 37b. Then, the first lever 36 is also rotated clockwise in FIG. As a result, the interlocking member 40 is pushed to the left in the drawing, and the diaphragm operating member 34 rotates counterclockwise in the drawing in accordance with the biasing spring 35 to push the interlocking member 32a to return the diaphragm to the open state.

In addition, the mirror-up operation is performed together with the above-mentioned diaphragm return operation. After that, the film is wound up by a motor winding device (not shown). In response to this, the second lever 37 is rotated counterclockwise in the figure by a known mechanism, while the first lever 36 is operated to return the aperture as described above. Since it is already engaged with the locking lever 38 at the end of, the aperture driving means (36 to 39) are charged again to the state shown in FIG. 10 and ready for the next photographing. In FIG. 10, reference numerals 44 to 46 are levers forming the mirror-up mechanism, and 47 is a lever system (44 to 4).
6) is a connecting lever for operating in conjunction with the diaphragm operating member 34, but a detailed description thereof will be omitted here.

Here, a photo interrupter 61 which is an encoder as an example of the displacement detecting sensor as described above.
Needless to say, it is preferable to use the same as the one having the integrated package structure shown in FIGS. 8A and 8B described above. It should be noted that the on / off pulse signal obtained by the photo interrupter 61 causes the CP
U50 detects the aperture speed and acceleration and predictively controls the aperture to stop at the target aperture position. However, encoders as such displacement (rotation amount) detection sensors include, for example, the photo interrupter 61 described above, as well as, for example, a photo reflector, a magnetic encoder, and the like, and an appropriate detection sensor may be used.

[0036]

By the way, according to the above-mentioned conventional structure, in any case, the following problems in practical use cannot be avoided, and it is desired to take some measures. ing.

That is, in the AF mechanism of the former AF camera, in synchronization with the drive control of the motor M for driving the lens, the photo interrupter 12 which is an encoder for monitoring the amount of change (lens drive amount) is sent. The power supply was controlled individually, and the power supply control was managed entirely by software. In other words, in the conventional device, a signal for driving the motor M and a signal (power supply) for operating the photo interrupter 12 that performs feedback control of the motor M are separated by the CPU 8 which is a control device (controller). It was processed softly by the signal.

However, in the drive control of the motor M as described above, for example, the AF motor control in the AF camera, in addition to the lens drive for normal focusing, the scan control at the time of low contrast detection and the lens drive for the lens drive are performed. It is performed in various situations programmatically, such as driving stop at the lens end position detection, driving stop by release button off detection, etc.
It is not always easy to control the power supply to the encoder in synchronization with the motor drive control.

In particular, in the above-described configuration in which the drive control of the motor M and the power supply control to the sensor are separately performed, there are disadvantages such as an increase in the number of program steps and an increase in the processing time in the control by the CPU 8. Therefore, it is desirable to take some measures that can solve the above problems.

On the other hand, in the aperture control mechanism of the latter camera in the above-mentioned conventional example, it is necessary to appropriately excite the aperture start magnet 60 for aperture control, and the detection for detecting this aperture control state is required. It was necessary to supply and stop the power supply to the encoder (photo interrupter 61) as the sensor in accordance with the above-mentioned diaphragm control.

That is, in single-lens reflex cameras, open metering is the mainstream at present, the aperture on the lens side is open before photographing, and the shutter speed and aperture value according to the photographing mode are calculated by measuring the illuminance of the subject. After the release operation, the aperture start magnet 40 is energized to excite the aperture, so that the aperture is stopped down to a predetermined amount.

Here, the photo interrupter 61 is used as an encoder which is a sensor for detecting the amount of aperture reduction for feedback control when performing such aperture control.
It is common to do in. In such power supply control to the photo interrupter 61, the CPU 50 that controls the release sequence starts power supply prior to the start of the aperture control described above, and stops the power supply after the aperture control ends. Was there. In particular, the power supply to the photo interrupter 29 and the management of the power supply stop timing are all usually performed by software.

Therefore, such diaphragm control and control of the diaphragm displacement detection system are complicated operations in terms of software in the series of release sequence control in the CPU 50, and the CPU 50 has a dedicated port for encoder power supply control. There was also a drawback that it required. In other words, in the conventional apparatus, the diaphragm start magnet 6 for controlling the diaphragm is used.
A signal for energizing 0 for excitation and a signal (power supply) for activating the encoder 61, which is a diaphragm displacement amount detecting sensor for detecting the movement of the diaphragm operating member 7 associated therewith, are separately provided in the CPU 50 as a controller. It was done by signal processing.

However, in the camera equipped with the above-mentioned aperture control device, in addition to the lens drive for normal focusing, AF lens drive, scan control at the time of low contrast detection, and lens end position detection at the time of lens drive The program is performed in various scenes such as driving stop at the time of stop, driving stop by detecting the release button off, and the like. The encoder 61 is synchronized with energization control to the diaphragm start magnet 60.
It is not always easy to control the power supply to.

Further, as described above, in the configuration in which the excitation control of the magnet 60 and the power supply control to the encoder 61 are separately performed, there are disadvantages such as an increase in the number of program steps and an increase in processing time in the control by the CPU 50. Therefore, it is desired to take some measures to solve the above-mentioned problems in consideration of these points.

The present invention has been made in view of the above circumstances, and includes drive control of a movable member that is a controlled object or an actuator that is a controlled object that drives this.
The operation control of the feedback control detection sensor that monitors the drive state such as the displacement amount and the change amount of the movable member or the actuator is simply controlled by the control device, that is, drive control and feedback control are performed by one control signal. It is an object of the present invention to obtain a suitable power supply control device of a detection control system by applying it to, for example, an AF mechanism of an AF camera or a diaphragm control mechanism of a camera.

[0047]

In order to meet such a demand, a power supply control device of a detection control system according to the present invention includes an actuator such as a motor to be controlled, a control device for controlling the drive of the actuator, and an actuator. It is equipped with a detection sensor such as an encoder that constitutes a feedback control system that monitors the drive state of, and the power supply and power supply stop control of the electric power required for the operation of this detection sensor are controlled by the control output signal to the actuator output from the control device. It is provided with an automatic power supply control circuit which is automatically operated based on the above.

Further, in the power supply control device of the detection control system according to the present invention, the actuator, the control device, the detection sensor and the automatic power supply control circuit thereof are provided in the main body of the applied device, and the movable member driven and controlled by the actuator is It is provided as an accessory that is detachably attached to the main body of the applicable device.

Further, in the power feeding control device of the detection control system according to the present invention, the actuator is the AF lens driving motor in the camera, and the detection sensor is the driving including the forward rotation, the reverse rotation and the braking state of the AF lens driving motor. This drive amount detection encoder is configured by a drive amount detection encoder that monitors the amount, and this drive amount detection encoder operates by supplying power to the motor while driving the motor, and stops the power supply when the motor stops. It is configured to do.

The power supply control device of the detection control system according to the present invention includes an actuator controlled by the control device,
A movable member that is drive-controlled by the actuator, a control device that controls the drive of the actuator, and a detection sensor that constitutes a feedback control system that monitors the displacement of the movable member during driving are provided. An automatic power supply control circuit for automatically performing power supply / power supply stop control in accordance with the drive state of the movable member is provided, or power supply for the operation of the detection sensor is performed by an actuator that drives the movable member. There is provided an automatic power supply control device that automatically starts with a signal synchronized with the operation start signal and automatically stops with a control signal generated after the end of the operation of the actuator.

Further, in the power feeding control device of the detection control system according to the present invention, the movable member driven and controlled by the actuator is the aperture control member in the aperture control mechanism of the camera, and the detection sensor is the aperture control member. An encoder for diaphragm detection by an optical reading detection device such as a photo interrupter that monitors the displacement state.A control signal that includes a diaphragm start magnet energization signal that synchronizes with the release operation as a signal to start power supply to the detection sensor. And as a signal to stop the power supply,
Either the diaphragm control completion signal or the control signal output after the diaphragm control is completed, including the film winding start signal, is used.

[0052]

According to the present invention, an encoder, which is a detection sensor for monitoring the drive state of a motor, is monitored according to drive control outputs such as forward rotation, reverse rotation, and brake from a control device for a motor as an actuator. Power is turned on automatically
The off control can be achieved by hardware in the automatic power supply control circuit. That is, when the drive output (forward rotation, reverse rotation, brake) from the control device to the motor is output,
Power supply to the detection sensor is automatically started by the automatic power supply control circuit, and power supply is automatically stopped when the motor stop output is issued.

Therefore, according to the present invention, it is not necessary to manage the on / off control of the power supply to the detection sensor such as the encoder by the software in the control device every time the driving state of the actuator such as the motor is changed. .

Further, according to the present invention, for example, by outputting a signal in synchronization with the start of the release operation, the control device drives and controls the aperture control mechanism, which is a movable member, via an actuator such as an aperture start magnet. In addition, in conjunction with this, the automatic power supply control device automatically starts power supply to the encoder for aperture monitor detection etc., and completes aperture control and film winding start.
Power supply is automatically stopped in synchronization with the signal output after the aperture control is completed.

Further, according to the present invention, the power supply to the encoder for aperture monitor or the like is automatically turned on in synchronization with the start of the release sequence, and the power supply is turned off in synchronization with the signal output after the end of the aperture control. Therefore, the power supply to the displacement detection sensor such as the encoder is controlled by the hardware of the automatic power supply control device, which eliminates the conventional software management by the control device.

[0056]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a power supply control device of a detection control system according to the present invention, which is shown in FIG.
An example of the decoder logic in the logic circuit 14 for driving the motor in the AF mechanism of the F camera is specifically described by a logic circuit, and an automatic power supply circuit to the detection sensor is added.

Here, in FIG. 9 showing the above-mentioned conventional example, C is used.
The PU 8 was controlled by software so as to supply power to the encoder (photo interrupter) 12, which is a detection sensor, when the motor M was driving or braking, but in FIG. 1, the driving state of the motor M is automatically determined by logic. However, if the drive of the motor M is not stopped, the encoder 12 is supplied with power.

Explaining this in detail, the logic in the power supply control device of the detection control system according to the present invention is extremely simple,
The motor M is controlled according to Table 1 by the output of the motor control terminals a and b from the CPU 8 (see FIG. 9). Here, NAND gate (hereinafter referred to as NAND)
1 to NAND3 take charge of decoding, NAND1 outputs normal rotation, NAND2 reverse rotation, and NAND3 outputs "L" when decoding the brake, and "H" at other times.

NAND 5 and 6 are PN during braking.
It functions to turn on the P power transistors 9 and 10. Also, one of the motor control terminals a and b is "L".
If so, since the NAND4 becomes "H", the transistor Tr is turned on to supply power to the encoder 12 or send a power supply signal.

Further, when both the control terminals a and b are "H", the motor M is off and the encoder 1
The power supply to 2 is also stopped. When the photo interrupter shown in FIGS. 8A and 8B is used as the encoder 12, if the collector terminal of the transistor Tr is connected to the cathode terminal of the photodiode 12a via a current limiting resistor. Good. Reference numeral 16 in FIG. 1 is a well-known bridge circuit for rotating the motor M forward, reverse, brake, and stop.

According to this structure, if the motor M is not turned off, the power is supplied to the encoder 12 without fail, and if the motor M is rotated, the encoder 12 detects this and the CPU 8 interrupts. Since the signal is sent to the input or the counter input, the control software of the CPU 8 does not need to control the power supply of the encoder 12.

FIG. 2 shows an example in which the control of the motor M and the power supply control of the encoder 12 described above are realized by a logic circuit in the interface controlled by the CPU 8. Note that in FIG. 9 described above, the decoder of the control code is included in the motor driver, but in FIG. 2, in addition to this, an interface further including a decoder for power supply control of the encoder 12 is used.

The logic operation of the circuit configuration shown in FIG. 2 will be briefly described below. That is, NAND50
2 to 505 are control output terminals A from the CPU 8,
In the B and C decoder, the NAND 502 is a normal rotation, NAND
503 is reverse rotation, NAND 504 is brake, NAND5
05 performs off decoding. Such terminal A,
The control code table for B and C is shown in Table 2 below.

[0064]

[Table 2]

That is, the STROBE signal of the CPU 8 is further inverted by the inverter 501 and is commonly input to the decoder composed of the NANDs 502 to 505.
Therefore, each decoder outputs the STROBE signal to the D inputs of the subsequent flip-flop circuits 506 to 509 only in the states of A, B, and C shown in Table 2 above. S
Since the TROBE signal is a negative pulse, a negative pulse is input to the D input, and the D input selected in the code table of Table 2 above is the rising edge of the STROBE signal and "H" is input to its Q output. A, B, C code output and STRO
The timing with the BE signal is as shown in FIG.

Continuing the code shown in Table 2, the D input of the flip-flop circuits 506 to 509 sets the Q output to "H" at the output of the STROBE signal, and the D input of each of the other three circuits is the D input. Q output of either is "H",
That is, when the Q bar output is “L”, the AND gate 510
To 513 are cleared by the logic circuit. That is, Table 2 above
When the D input of the flip-flop circuits 506 to 509 is selected by any one of the codes and its Q output becomes “H”, the D inputs corresponding to the other three codes are automatically cleared.

Therefore, the CPU 8 need only issue the necessary drive code of the motor M without considering clearing the D input of the flip-flop circuits 506 to 509. N
The ANDs 514 and 515 have the same functions as the NANDs 5 and 6 in FIG.

The D input of the flip-flop circuit 509 is
Q output becomes "H" when the motor M is off,
Since it is "L" in other cases, connect this to transistor 5
In the case of forward rotation, reverse rotation, and braking, the power supply signal is automatically output to the encoder 12.

That is, according to the power supply control device of the detection control system according to the present invention, as is clear from FIG. 1, FIG. 2 or FIG.
A drive motor M, a CPU 8 that is a control device that controls the drive of the drive motor M, and an encoder 12 (using a photo interrupter or the like) that is a detection sensor that constitutes a feedback control system that monitors the drive state (change amount and the like) of the motor M are provided. It is characterized in that an automatic power supply control circuit 14 is provided for automatically supplying power required to operate the encoder 12 and controlling power supply stop based on the control output of the motor M output from the CPU 8. ing.

In FIG. 4, 20 is an AF motor as an actuator, and 21 is the motor 20
A lens, which is a movable member that is driven by F, constitutes a lens driving mechanism.

According to such a configuration, the detection sensor for monitoring the driving state of the motor M according to the drive control output such as forward rotation, reverse rotation and brake from the CPU 8 for the motor M as an actuator. The on / off control of the power supply to the encoder 12 can be achieved by hardware. That is, when the motor drive output (forward rotation, reverse rotation, brake) is output from the CPU 8,
The power supply to the encoder 12 is automatically started, and the power supply is automatically stopped when the motor stop output is issued.

Therefore, according to the present invention, every time the driving state of the actuator such as the motor M is changed, the on / off control of the power supply to the detection sensor such as the encoder 12 is controlled by the CP.
There is no need for software management in U8. That is, according to the present invention, the automatic power supply control circuit 14 for the encoder 12 such as a photo interrupter, which is a detection sensor, is provided, and power supply control for the encoder 12 by software is unnecessary. That is, this software does not need to control the power supply to the encoder 12.

With such a configuration, in the drive control of the actuator of the motor M or the like, when the drive state is monitored by the encoder 12, energization control to the encoder 12 is automatically performed by the drive control output of the motor M. The advantage is that the load on the control program is lightened and the energization control can be performed reliably. Further, there is a secondary effect that the code capacity of the control program can be reduced and the responsiveness can be improved.

Further, according to the power supply control device of the detection control system according to the present invention, as is apparent from FIG. 4, the motor 20 which is an actuator, the CPU 8 which is a control device, the encoder 12 which is a detection sensor, and its automatic power supply. The control circuit 14 is provided on the camera body 3 which is the camera body which is the application equipment body, and the movable member 21 such as a lens which is a controlled member driven by the motor 20 is detachably provided on the camera body 3. It is configured to be provided on the interchangeable lens 1 which is a product.

In such a configuration, the control device by the CPU 8 controls the drive of the motor 20 as a control target for appropriately driving the movable member 21 to be controlled, and the drive state (displacement of the motor 20). amount,
The encoder 12, which is a detection sensor for monitoring a displacement position, etc., is configured to be operated by a hardware automatic power supply control by a control circuit (see FIG. 1 and FIG. 2) provided in the camera body 3.

Therefore, when the present invention is applied to, for example, an AF mechanism of a camera, a movable member 21 such as a lens to be controlled which is driven by an AF motor 20 which is an actuator is detachably attached to the camera body 3. When the interchangeable lens 1 which is a movable member is incorporated, the control loop can be closed only within the camera body 3, which is advantageous in terms of design and maintenance of the entire camera. Play.

FIGS. 5 and 6 show another embodiment of the power supply control device of the detection control system according to the present invention. In these drawings, the single-lens reflex camera is used in the same manner as FIG. 10 showing the present invention. The present invention is applied to the aperture control system of No. 2, and the same or corresponding portions as those in FIG.

Here, in the present invention, FIG.
The difference from the conventional example shown in FIG.
Reference numeral 50 denotes an encoder (photointerrupter) 6 described later.
It is configured to output each output through an interface which is the automatic power supply control circuit 70 for the first unit.

Next, the operation of the automatic power supply control circuit 70 (hereinafter referred to as interface 70) as an interface connected to the CPU 50 will be described.

Here, the CPU 50 uses the interface 7
With respect to 0, a code is output to each output of the ports A, B, and C, and a STOROBE signal is subsequently output to input a command. In addition, a NAND gate (hereinafter simply referred to as N
702 to 704 take charge of decoding,
The operation according to the control decoding table shown in Table 3 below is performed.

[0081]

[Table 3]

The flip-flop circuits 706 to 7
The 09 D input is for these stores. The timings of the codes of the ports A, B and C and the STROBE signal are the same as those shown in FIG.

That is, the STROBE signal of the CPU 50 is inverted by the inverter 701 and is commonly input to the decoders composed of the NANDs 702 to 705. Therefore, each decoder outputs the STROBE signal to the D inputs of the subsequent flip-flop circuits 706 to 709 only in the states of A, B, and C shown in Table 1 above. ST
Since the ROBE signal is a negative pulse, a negative pulse is input to the D input, and the D input selected in the code table of Table 1 above is the rising edge of the STROBE signal and "H" is input to its output Q.

Further, the NAND 710 and the NAND 711,
712 and NAND 713 each form an RS flip-flop, and the output of NAND 710 is "L" when the energization of the diaphragm start magnet 60 is on, "H" when it is off, and NAND.
The output of 712 is “L” when the energization of the diaphragm locking magnet 60 is on and “H” when it is off.

Here, on / off of the aperture start magnet 60 and the aperture stop magnet 63 must be controlled individually by software, but power is not supplied to the encoder (photo interrupter) 61 for monitoring the aperture amount. It is controlled by an RS flip-flop composed of NAND 714 and 715T so that the stop start magnet 60 is turned on at the same time and the stop locking magnet 63 is turned on at the same time.

The reason why the logic is configured as described above is that the diaphragm is mechanically started to be energized when the energization of the diaphragm start magnet 60 is turned on, and it is no longer necessary to supply power to the encoder 61 after the diaphragm control is completed. .

However, the present invention is not limited to this, and in addition to the above, for example, in a camera having a motor winding mechanism,
It is also possible to decode another timing to form a logic such that the power supply to the encoder 61 is turned on by a mirror-up start signal or the power supply to the encoder 61 is synchronized with the start of film winding.

It is also possible to add these decoding and input functions to the interface 70 in FIG. In any case, the present embodiment is characterized in that it is not necessary to control the power supply to the encoder 61 in terms of software, and all the control can be performed by the interface 70 that is hardware.

That is, according to the power feeding control device of the detection control system according to the present embodiment, as is clear from FIG. 5 and FIG.
An encoder (photointerrupter) 61 which is a displacement detection sensor for feedback control for monitoring the displacement of an aperture control member (movable member) 34 driven and controlled by a CPU 50 which is a control device via an aperture start magnet 60 which is an actuator. Power supply to and stop control of power supply to the diaphragm control member 34 are automatically started by a signal synchronized with the operation start signal of the diaphragm start magnet 60 that drives the diaphragm control member 34. The feature is that an automatic power supply control circuit 70 is provided for automatically stopping by a control signal generated after the end of the operation of 60.

Here, as the signal for starting the power supply to the encoder 61, any one of the appropriate control signals including the energization signal of the diaphragm start magnet 60 synchronized with the release operation is used, and the power supply is stopped. As the signal, either the diaphragm control completion signal or the control signal output after the diaphragm control is finished, including the film winding start signal, may be used.

With such a configuration, the CP synchronized with the output of the signal in synchronization with the start of the release operation
The diaphragm control member 34 is driven and controlled by the U50 via the diaphragm start magnet 60, and in conjunction with this, the power supply to the encoder 61 for detecting the diaphragm monitor is automatically started by the hardware of the automatic power supply control circuit 70. In addition, the power supply is automatically stopped in synchronization with the signal output after the aperture control is completed, such as when the aperture control is completed or the film winding is started.

Therefore, according to the present embodiment, the power supply to the encoder 61 for aperture monitor or the like is automatically turned on in synchronization with the start of the release sequence, and is synchronized with the signal output after the aperture control is completed. In order to turn off the power supply, the power supply to the encoder 61 is controlled by hardware by the automatic power supply control circuit 70, which eliminates the conventional software-like management of sending two signals from the CPU 50.

In other words, according to the apparatus of this embodiment, in the drive control of the movable members (34, 62) driven by the actuators such as the magnet 60 and the motor, the drive state is monitored by the detection sensor such as the encoder 61. In this case, the energization control to the encoder 61 is automatically performed by the drive control output of the actuator, and as a result, the load of the control program is lightened and the energization control is reliably performed. Further, there is a secondary effect that the code capacity of the control program can be reduced and the responsiveness can be improved.

In particular, according to the apparatus of this embodiment, the movable members (34, 62) which are driven and controlled by the CPU 50 which is the control apparatus via the magnet 60 which is the actuator.
And a feedback control system by a detection sensor (61) for monitoring the displacement, and the power feeding control of the feedback control system is configured to be performed in synchronization with the driving of the movable member. Even if the displacement operation is hindered by various forces, accurate displacement information is fed back to the CPU 50, and error-free control is possible.

It is needless to say that the present invention is not limited to the structure of the above-mentioned embodiment, and the shape, structure, etc. of each part can be appropriately modified or changed. That is, in the above-described embodiment, the case where the present invention is applied to the drive control system of the AF drive motor M in the AF mechanism of the AF camera or the aperture control mechanism of the camera has been described, but the present invention is not limited to this. For example, a drive control system of an air conditioner used as a temperature control system in a shutter mechanism of a camera, a mechanism unit including various actuators in the camera, a portable electronic device using a battery, a pen recorder, and a thermostatic chamber, and the like. Of course, it may be applied to a feedback control system.

In particular, the present invention comprises an actuator or a movable member driven by the actuator, a detection sensor for monitoring the amount of displacement thereof, and a control device for performing feedback control of the actuator or the movable member according to the sensor output. With regard to the power supply control device of the detection control system, the actuator or the movable member is controlled by software by one input signal (control signal) to the control device, and the power supply control to the detection sensor is automatically performed by the hardware by the control circuit. The present invention can be applied to equipment and devices in various fields and can exert its effect.

Further, in the above-described embodiment, the diaphragm start magnet 60 in the AF drive motor and diaphragm control mechanism is used.
However, the present invention is not limited to this. For example, a motor incorporated in a camera (a film winding motor, various sequence motors, a motor of each mechanism such as a shutter magnet) is used.
In addition to the above, an air conditioner or a pressurizing device for setting the temperature in the constant temperature bath may be used.

Further, in the above-mentioned embodiments, an encoder such as a photo interrupter is exemplified as the detection sensor for monitoring the driving state of the actuator or the movable member, but the present invention is not limited to this, and an optoelectronic device such as a photo reflector or a magnetic encoder. Alternatively, it goes without saying that it may be a temperature detecting device which is a temperature sensor at the air outlet of the constant temperature bath, a position detecting sensor using a piezoelectric element (piezo element), or the like.

[0099]

As described above, according to the power supply control device of the detection control system according to the present invention, an actuator such as a motor to be controlled, a control device for controlling the drive of the actuator, and a drive state of the actuator are monitored. An automatic power supply control circuit that includes a detection sensor such as an encoder that constitutes a feedback control system, and that automatically performs power supply control of the power required for operating the detection sensor based on the control output of the actuator output from the control device. Since it is provided, various excellent effects as described below can be obtained despite the simple configuration.

That is, according to the present invention, the power supply to the detection sensor for monitoring the drive state of the actuator can be automatically turned on / off according to the drive control output from the control device for the actuator. Can be achieved by hardware. That is, when the actuator drive output is output from the control device, power supply to the detection sensor is automatically started, and when the actuator stop output is output, power supply is also automatically stopped.

In the present invention, it is not necessary for the control device to manage the on / off control of the power supply to the detection sensor by software every time the drive state of the actuator is changed. Therefore, according to the present invention, in the drive control of the actuator, when the drive state is monitored by the detection sensor, the energization control to the detection sensor is accompanied by the drive control output by the software of the actuator, and the automatic power supply control circuit accordingly. Since it can be automatically performed by hardware, the load on the control program is lightened and the energization control is reliably performed. Further, according to the present invention, there is a secondary effect that the code capacity of the control program can be reduced and the responsiveness can be improved.

Further, according to the power feeding control device of the detection control system of the present invention, the actuator, the control device, the detection sensor and the automatic power feeding control circuit thereof are provided in the main body of the applied device, and the movable member driven by the actuator is provided. , It is configured to be provided on the accessory side that is detachably provided on the main body of the applicable device.

According to this structure, the movable member such as the lens to be controlled, which is driven by the AF motor which is the actuator when it is used in the AF mechanism of the camera, is detachably attached to the camera body. When incorporated in an interchangeable lens which is a movable member to be mounted, the control loop can be closed only within the camera body, which is advantageous in terms of design, maintenance and inspection of the entire camera.

Further, according to the power supply control device of the detection control system according to the present invention, the movable member driven and controlled by the control device via the actuator and the detection for feedback control for monitoring the displacement of the movable member. A sensor is provided, and power supply to this detection sensor and power supply stop control are automatically started in synchronization with the driving state of the movable member, that is, with a signal synchronized with an operation start signal of an actuator for driving the movable member. Since the automatic power feeding control device for automatically stopping by the control signal generated after the end of the operation of the actuator is provided, the following various excellent effects are obtained despite the simple configuration.

That is, according to the present invention, for example, by outputting a signal in synchronization with the start of the release operation, the control device drives and controls the aperture control mechanism, which is a movable member, via an actuator such as an aperture start magnet. At the same time, in conjunction with this, the automatic power supply control device automatically starts power supply to the encoder for diaphragm monitor detection, and completes diaphragm control and starts film winding.
Since the power supply is automatically stopped in synchronization with the signal output after the aperture control ends, the power supply to the encoder for aperture monitor etc. is automatically turned on in synchronization with the start of the release sequence. Since the power supply is turned off in synchronization with the signal output after the end, the power supply to the displacement detection sensor such as the encoder is controlled by the hardware by the automatic power supply control device, and the software is managed by the conventional control device. Is unnecessary.

In other words, according to the present invention, in the drive control of the controlled member driven by the actuator such as the magnet or the motor, when the drive state is monitored by the detection sensor such as the encoder, the energization control to the encoder is performed. Is automatically performed by the drive control output of the actuator, the load on the control program is reduced, and the energization control is reliably performed. Further, there is a secondary effect that the code capacity of the control program can be reduced and the responsiveness can be improved.

Further, according to the present invention, a movable member driven and controlled by the control device via the actuator, and a detection sensor forming a feedback control system for monitoring the displacement thereof are provided, and the power feeding control of the feedback control system is performed.
Since it is configured to perform according to the drive of the movable member,
Even if the displacement operation of the movable member is hindered by some external force, accurate displacement information is fed back to the control device, and it is possible to perform control without error.

[Brief description of drawings]

FIG. 1 is an electric system diagram showing an embodiment of a power supply control device of a detection control system according to the present invention.

FIG. 2 is an electric system diagram showing another embodiment of the power supply control device of the detection control system according to the present invention.

FIG. 3 is a time chart in the power supply control device of the detection control system of FIG.

FIG. 4 is a schematic diagram when a power supply control device of a detection control system according to the present invention is applied to a camera.

FIG. 5 is a schematic configuration diagram showing an electric power feeding control device of a detection control system according to another embodiment of the present invention, including an electric system diagram when applied to an aperture control mechanism of a single-lens reflex camera.

6 is a block diagram showing a schematic configuration of a power supply control device of a detection control system according to the present invention shown in FIG.

FIG. 7 is a schematic configuration diagram showing an AF mechanism of an AF camera suitable for applying the power supply control device of the detection control system according to the present invention.

FIG. 8 illustrates a photo interrupter which is a typical encoder suitable for detecting a lens driving amount by an AF mechanism, (a) shows an electric circuit diagram thereof, and (b) shows a package of the photo interrupter. It is a schematic perspective view.

FIG. 9 is an electric system diagram showing a power supply control device of a conventional detection control system.

FIG. 10 is a schematic configuration diagram including an electrical system diagram when applied to a diaphragm control mechanism showing an example of a power supply control device of a conventional detection control system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Lens barrel which is an interchangeable lens, 2 ... Photographing optical system (lens), 3 ... Camera body, 6 ... Focus detection module,
8 ... CPU (control device), 9 ... Lens drive device, 12 ...
Photo interrupter (encoder; detection sensor), 14
... automatic power supply control circuit, 16 ... bridge circuit, 20 ... actuator (AF motor), 21 ... movable member (lens), 31 ... diaphragm preset ring, 32 ... diaphragm mechanism (diaphragm control mechanism), 34 ... diaphragm operation Member (movable member; diaphragm control member), 37 to 40 ... diaphragm driving means, 50 ... CPU (control device), 60 ... diaphragm start magnet (actuator), 61 ... photo interrupter (encoder; detection sensor), 62 ... Encoder disk, 63 ... Aperture locking magnet, 70 ... Automatic power feeding control circuit (interface; automatic power feeding control device).

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location G03B 3/10 13/34

Claims (8)

[Claims] 1. An actuator to be controlled, a control device for controlling the drive of the actuator, and a detection sensor forming a feedback control system for monitoring the drive state of the actuator, which are necessary for the operation of the detection sensor. A power supply control device for a detection control system, comprising an automatic power supply control circuit for automatically performing power supply and power supply stop control based on a control output signal to the actuator output from the control device. 2. The power supply control device of the detection control system according to claim 1, wherein an actuator, a control device, a detection sensor and an automatic power supply control circuit thereof are provided in a main body of an applicable device, and a movable member which is drive-controlled by the actuator. Is provided in an accessory that is detachably provided in the main body of the applicable device. 3. The power supply control device for a detection control system according to claim 1, wherein the actuator is an AF lens driving motor in the camera, and the detection sensor is a normal rotation of the AF lens driving motor. , An encoder for driving amount detection that monitors the driving amount including the reverse rotation and the braking state, and the automatic power supply control circuit of the control device operates the motor by supplying power to the driving amount detection encoder together with the motor drive. A power supply control device for a detection control system, which is configured to stop power supply when the power supply is stopped. 4. The power supply control device of the detection control system according to claim 1, claim 2, or claim 3, wherein the actuator to be controlled is an AF motor that causes the photographing optical system to focus in the camera, and a film. A power supply control device for a detection control system, which is either a winding motor, a sequence motor for performing various sequence operations, or a diaphragm operating magnet for operating a diaphragm control member in a camera diaphragm control mechanism. . 5. An actuator, a movable member which is drive-controlled by the actuator, a control device which controls the drive of the actuator, and a detection sensor which constitutes a feedback control system for monitoring displacement of the movable member during driving. And a power supply control of a detection control system, which is provided with an automatic power supply control circuit that automatically performs power supply and power supply stop control for the operation of the detection sensor in accordance with the driving state of the movable member. apparatus. 6. An actuator, a movable member which is drive-controlled by the actuator, a control device which controls the drive of the actuator, and a detection sensor which constitutes a feedback control system for monitoring a displacement of the movable member during driving. The automatic supply of electric power necessary for the operation of this detection sensor is started by a signal synchronized with the operation start signal of the actuator for driving the movable member, and automatically by a control signal generated after the end of the operation of this actuator. A power supply control device for a detection control system, which is provided with an automatic power supply control device for stopping the power supply. 7. The power supply control device for a detection control system according to claim 5, wherein the movable member driven and controlled by the actuator is an aperture control member in an aperture control mechanism of the camera, and the detection sensor is A diaphragm detection encoder for monitoring the diaphragm displacement state of the diaphragm control member, and as a signal for starting the power supply to the detection sensor, while using any one of the control signals including the diaphragm start magnet energization signal synchronized with the release operation, As a signal for stopping the power supply, a diaphragm control completion signal,
A power supply control device of a detection control system, characterized in that any one of control signals output after completion of aperture control including a film winding start signal is used. 8. The power supply control device of the detection control system according to claim 1, claim 2, claim 3, claim 4, claim 5, claim 6 or claim 7, wherein the detection sensor is an encoder. 1. An electric power supply control device for a detection control system, wherein any one of an optical reading detection device such as a photo interrupter, a photo reflector, or a magnetic encoder is used.