JP6611590B2 - Lens control device, photographing device - Google Patents

Description

  The present invention relates to a lens control device, and more particularly to a lens control device that controls an operation torque of an operation means that operates a position of a movable optical member, and an imaging device having the lens control device.

  Conventionally, a lens device mounted on a television camera or the like has movable optical members such as an iris, a zoom, and a focus, and each of the movable optical members is provided with an operation member so that it can be manually operated by a user (cameraman). ing. In general, since the operation member and the movable optical member are mechanically connected, an operation torque necessary for operation of the operation member varies due to a difference in posture of the lens device, and the user's operation feeling is deteriorated. In addition, since a television camera user is required to perform a severe operation of the movable optical member, it is desired that the setting can be changed to an operation torque suitable for the user's preference. Furthermore, it is desirable that the operation torque can be changed similarly not only in the operation member configured in the lens apparatus but also in an operation apparatus (demand) for operating the movable optical member of the lens apparatus from the outside. For this reason, a number of lens devices or operating devices that can change the operating torque of the operating member have been proposed. For example, in the technique described in Patent Document 1, as a means for changing the operation torque, a variable resistor is configured between terminals of a motor connected to the operation member, and the resistance value of the variable resistor is changed. An optical device that can be set to an operating torque of is disclosed.

JP 2000-338382 A

  However, in the prior art disclosed in the above-mentioned patent document, it is necessary to configure a variable resistor between the motor terminals in order to set an arbitrary operation torque. Further, in order to change the operation torque, it is necessary to provide a mechanism that can access the variable resistor from the outside, which makes the structure complicated and increases the manufacturing cost.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a lens control device that can change an operation torque easily and inexpensively.

  In order to achieve the above object, a lens control device of the present invention is a lens control device for controlling an operation torque of an operation means for operating a position of a movable optical member of a lens device, and is a direct current connected to the operation means. Electric means, switching means for switching a resistance value between terminals of the DC electric means, and control means for controlling the operating torque of the operating means by periodically repeating the switching by the switching means. Features.

  According to the present invention, it is possible to provide a lens control device that can change the operation torque easily and inexpensively.

1 is a block diagram illustrating a configuration of a photographing apparatus according to Embodiment 1. FIG. 3 is a graph showing a relationship between a duty ratio and an operation torque in Example 1. FIG. 6 is a block diagram illustrating a configuration of a photographing apparatus according to a second embodiment. 7 is a flowchart showing a flow of motor control in the second embodiment. FIG. 9 is a block diagram illustrating a configuration of a photographing apparatus according to a third embodiment. 9 is a flowchart showing a flow of motor control in the third embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  Hereinafter, a lens control device according to a first embodiment of the present invention and a photographing device including the same will be described with reference to FIGS. FIG. 1 shows the configuration of a photographing apparatus according to the first embodiment of the present invention.

  The photographing apparatus includes a lens device 100, a grip device 200, and a camera device 300. The lens device 100 includes a zoom lens 102 (movable optical member), a zoom lens operation unit 101 (operation means), and a movable optical member such as a focus lens (not shown) and an iris shown in FIG. It is comprised by the operation means of the optical member. Hereinafter, the zoom lens 102 that is one of the movable optical members will be described as an object of the present invention. However, the present invention can be similarly applied to a focus lens, an iris, and the like that are other movable optical members. Please keep in mind.

  The grip device 200 is a holding unit for a user to hold the photographing device, and includes the lens control device of the present invention, and is configured by a motor (DC electric unit) 201, a CPU 202, and a circuit switcher (switching unit) 203. Yes. The CPU 202 includes an operation torque control unit (operation force control means) 210 and a memory 211. Further, the camera device 300 having the image sensor 310 is connected to the lens device 100, and the image sensor is configured by receiving light from the lens device 100 by the image sensor 310 and performing photoelectric conversion.

  Hereinafter, each component will be described.

  The zoom lens operation unit 101 of the lens apparatus 100 changes the focal length by transmitting an operation from a user to the zoom lens 102 and displacing the zoom lens 102 in the optical axis direction.

  The motor 201 is connected to the zoom lens operation unit 101 via a gear train, and the motor 201 also rotates as the zoom lens operation unit 101 rotates.

  The circuit switch 203 is a switch that is connected between both terminals of the motor 201 and switches between a short circuit (short) state and an open (open) state between the terminals. That is, it can be considered that the resistance value between the terminals of the motor 201 is switched between a low resistance state in which only the resistance value of the conducting wire is changed and a high resistance state through an air insulator by opening and closing the circuit switch 203. The circuit switch 203 is not only a mechanical switch such as a relay, but may be a semiconductor such as an FET, for example, and the semiconductor is more desirable because it can be made smaller and less expensive. The circuit switch 203 is connected to the CPU 202 and switches between a short state and an open state under the control of the operation torque control unit 210 configured in the CPU 202. By the motor 201 and the circuit switch 203, an operation torque (operation force) is applied to the zoom lens operation unit 101. The operation torque application principle and setting method will be described later.

  The operation torque control unit 210 is configured in the CPU 202 and periodically switches the state of the circuit switcher 203 between a high resistance state and a low resistance state by pulse width modulation (PWM) control. A pulse width ratio (duty ratio) is determined in accordance with the operation torque setting stored in advance, and PWM control is performed at a predetermined frequency. The memory 211 is configured in the CPU 202 and stores setting values such as the relationship between the operation torque and the duty ratio.

  Next, the operation principle of operating torque will be described.

  As described above, when the zoom lens operation unit 101 is operated, the motor 201 connected via the gear train also rotates. When the switch of the circuit switcher 203 is short-circuited, a counter electromotive force is generated when the motor 201 rotates, and a braking torque is generated in the motor 201 due to a magnetic field action. This is an operation torque for an operator who operates the zoom lens operation unit 101. Acts as That is, when the motor 201 is driven from the output shaft side by an external force, an electromotive voltage is generated because a coil as a conductor rotates in a magnetic field generated by a permanent magnet inside the motor 201. What is the rotation direction of the motor 201? Current flows so that torque is generated in the reverse direction. Further, when the switch of the circuit switch 203 is open, an induced voltage is generated by rotating the motor 201, but no current flows, so that no braking torque due to counter electromotive force is generated. Therefore, only the torque due to the inertia moment (inertia) of the motor 201, that is, only the torque necessary for rotating the motor 201 becomes the operation torque.

  As described above, the operation torque of the zoom lens operation unit 101 applied by the motor 201 and the circuit switcher 203 is the maximum operation torque when the circuit switcher 203 is short, and the minimum operation torque when the circuit switch 203 is open. Become.

  Next, an operation torque setting method in the present embodiment will be described.

  As described above, when the operation torque is applied by the back electromotive force, the braking torque of the motor 201 is obtained by the current flowing along with the induced voltage. Therefore, the braking torque can be varied by controlling the amount of current flowing. The operating torque control unit 210 instructs switching of the circuit switch 203 at a predetermined frequency, and controls the ratio of the time for the short state and the time for the open state, that is, the duty ratio. Thus, the flowing current can be controlled. Therefore, when the short state is defined as the ON state, the larger the duty ratio, the larger the amount of current, and the braking torque can be increased. The frequency is set to such a high value that the fluctuation of the operation torque due to switching between the short state and the open state cannot be recognized by the user. For example, 40 Hz or more, preferably 70 Hz or more, more preferably 100 Hz or more. Here, since the duty ratio is adjusted at a cycle of 40 Hz or more, switching between the short state and the open state can be performed at a frequency several times or more. For example, one cycle of 40 Hz or more may be divided into eight, the short state may be set to seven times, and the open state may be set to one time, or vice versa, or vice versa.

  FIG. 2 shows the relationship between the duty ratio and the operating torque in this embodiment. The graph of FIG. 2 shows the operation torque when the motor 201 is operated at a constant speed.

  When the duty ratio is 0%, it indicates that the motor is always open. In this case, the operation torque is only the moment of inertia of the motor 201, which is the minimum torque in this embodiment. Further, when the duty ratio is 100%, it indicates that the state is always short-circuited. In this case, the braking torque by the counter electromotive force is the maximum state, which is the maximum torque of this embodiment. Therefore, when the duty ratio is 50%, the braking torque is half of the maximum value, and the operation torque is intermediate between the maximum torque and the minimum torque in this embodiment. Therefore, by controlling the duty ratio, the operation torque can be set to an arbitrary torque between the minimum torque and the maximum torque.

  The duty ratio to be set is determined based on the operation torque setting value stored in the memory 211. The operation torque setting value may be stored in advance as an operation torque value preferred by the user, or may be arbitrarily changed by the user.

  As for the frequency in the PWM control, the operation torque is changed by changing the duty ratio under the condition of a predetermined constant frequency. However, the present invention is not limited to duty ratio control under a constant frequency, and the same effect can be obtained even with duty ratio control under a variable frequency that is not constant. it can.

  As described above, it is not necessary to configure a variable resistor as in the prior art, and the operation torque can be varied easily and inexpensively.

  In the present embodiment, the example in which the motor 201 and the circuit switch 203 are configured in the grip device 200 has been described, but the present invention is not limited thereto. The configuration in the grip device 200 may be included in the lens device 100.

  In the present embodiment, the example in which the operation torque is set using a preset stored value has been described. However, the present invention is not limited to this. For example, setting is made so that the operating torque does not fluctuate between the case where the movable lens moves with a vertically upward component and the case where the movable lens moves with a downward component due to the attitude difference of the photographing device. Also good.

  In the present embodiment, the zoom lens operation unit 101 has been described. However, the present invention is not limited to this, and the present invention can also be applied to the focus lens operation unit and the iris operation unit in the same manner and enjoy the effects of the present invention. be able to.

  A lens control device and a photographing device having the lens control device according to a second embodiment of the present invention will be described below with reference to FIGS. In the present embodiment, a lens control device that can operate a focal length by electric drive (servo drive) in addition to the manual operation as described in the first embodiment and a photographing apparatus having the lens control device will be described.

FIG. 3 shows a configuration of a lens control device according to a second embodiment of the present invention and a photographing device having the same.
Components similar to those described in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

  In addition to the components shown in FIG. 1, the grip device 200 includes a position detector 204, an A / D converter 205, a command operation unit (command means) 206, a D / A converter 207, and a drive unit 208. . Further, the CPU 202 includes a position calculation unit 212 and a drive command calculation unit 213.

  The position detector 204 is a potentiometer, for example, and is connected to the zoom lens operation unit 101 via a gear train, and outputs a voltage signal corresponding to the amount by which the zoom lens operation unit 101 rotates. The A / D converter 205 converts the voltage signal output from the position detector 204 into a digital signal and transmits it to the CPU 202. A position calculation unit 212 configured in the CPU 202 calculates the position of the zoom lens operation unit 101 based on a signal from the position detector 204.

  The command operation unit 206 is operated by the user and outputs a voltage signal corresponding to the operation amount of the command operation unit 206. The voltage signal of the command operation unit 206 is also transmitted to the CPU 202 via the A / D converter 205 as with the position detector 204. A drive command calculation unit 213 configured in the CPU 202 calculates a drive command for driving the zoom lens 102 from a signal from the command operation unit 206. The D / A converter 207 converts the drive command into an analog signal and outputs a drive signal to the drive unit 208. The drive unit 208 applies a drive voltage according to the drive command between the terminals of the motor 201, drives the zoom lens 102 via the motor 201 and the zoom lens operation unit 101, and changes the focal length. When the command operation unit 206 is operated, the circuit switch 203 is set to a short state.

  In the first embodiment, an example in which an arbitrary operation torque is applied according to a preset value that has been stored in advance has been described. However, the counter electromotive force of the motor 201 varies depending on the rotation speed (operation speed), and the higher the rotation speed, Electric power is increased. In other words, when the duty ratio is set to a unique duty ratio, the operation torque increases as the rotational speed of the user's manual operation increases. Therefore, in this embodiment, an example in which the duty ratio is changed according to the rotation speed will be described.

  FIG. 4 is a flowchart showing the flow of motor control in the second embodiment.

  First, in step S10, it is determined whether or not the command operation unit 206 has been operated by the user. If there is an operation, the process proceeds to step S11, and if there is no operation, the process proceeds to step S14. In step S11, the circuit switch 203 is set to a short state in order to execute servo drive. Next, in step S12, a drive command corresponding to the operation amount of the command operation unit 206 is calculated. Next, in step S13, the drive command is transmitted to the D / A converter 207, a voltage is applied to the motor 201 via the drive unit 208, and the zoom lens operation unit 101 and the zoom lens 102 are driven. The servo drive by the motor 201 is executed by the user operating the command operation unit 206 through the above steps S11 to S13.

  Next, a case where there is no operation of the command operation unit 206, that is, a case where the process proceeds from step S10 to step S14 will be described.

  In step S14, it is determined whether or not the zoom lens operation unit 101 has been operated by the user. If there is an operation, the process proceeds to step S15, and if there is no operation, the process proceeds to step S18. In step S15, the position of the zoom lens operation unit 101 is calculated based on the signal from the position detector 204, and the rotation speed is calculated from the change in the position. Next, in step S16, the duty ratio of PWM control by the operation torque control unit 210 is set from the rotational speed. Here, the duty ratio is set lower as the rotational speed is higher, and higher as the rotational speed is lower. Next, in step S17, the circuit switcher 203 is PWM-controlled based on the duty ratio set in step S16 to switch between the short state and the open state. Through steps S15 to S17 described above, application of operation torque by the motor 201 is executed during manual operation by the user. Next, when the command operation unit 206 and the zoom lens operation unit 101 are not operated, in step S18, the circuit switch 203 is set in a short state.

  As described above, in this embodiment, the configuration in which not only the manual operation by the user but also the servo drive is possible has been described. For example, when it is desired to change the focal length at a very low constant speed, manual operation is difficult, and it is more convenient to enable servo drive. Further, in the present embodiment, the example in which the same motor 201 shares the operation torque applying means during manual operation and the drive means during servo driving has been described. Therefore, in an imaging apparatus that allows both manual operation and servo drive, it is only necessary to configure the circuit switch 203 in order to make the operation torque variable, which can be realized more simply and inexpensively.

  Further, during manual operation, the duty ratio is controlled to be lower as the rotation speed of the zoom lens operation unit 101 is faster, so that the operation torque can be reduced even when the rotation speed is fast and the back electromotive force is large. Therefore, it is possible to set a substantially constant operation torque regardless of the rotation speed, or a smaller operation torque as the rotation speed is faster, and the operability by the user is further improved.

  In the present embodiment, an example in which processing of manual operation and servo operation is separated depending on whether or not the command operation unit 206 is operated has been described. However, the present invention is not limited to this. For example, it may be separated by a switch or the like instructed by the user, or it may be determined whether there is an operation of the zoom lens operation unit 101, and the process may be separated.

  Further, in this embodiment, when the command operation unit 206 and the zoom lens operation unit 101 are not operated, the zoom lens operation unit 101 is difficult to move when the user touches the zoom lens operation unit 101 unintentionally. In order to do this, an example in which the maximum operating torque is set has been shown. However, the present invention is not limited to this. For example, even when another operation unit such as a focus lens or an iris, which is not described in this embodiment, is operated, the maximum torque may be set similarly. good.

  Further, as in the first embodiment, as for the frequency in the PWM control, it has been described that the operating torque is changed by changing the duty ratio under the condition of a predetermined constant frequency. However, the present invention is not limited to duty ratio control under a constant frequency, and the same effect can be obtained even with duty ratio control under a variable frequency that is not constant. it can.

  A lens control device and a photographing device having the lens control device according to a third embodiment of the present invention will be described below with reference to FIGS. In the present embodiment, an example will be described in which an operation torque setting of a demand device (operation device) that instructs the lens device to drive the optical adjustment member is performed. An example in which the drive end is notified to the user using the operation torque control means will be described.

  FIG. 5 shows the configuration of a lens control device according to a third embodiment of the present invention and a photographing device having the same.

  The lens device 100, the grip device 200, and the camera device 300 are the same as the constituents having the same reference numerals described in FIG. 3 of the second embodiment.

  The demand device 400 includes a motor (DC electric means) 401, a CPU 402, a circuit switcher (switching means) 403, a position detector 404, a counter 405, a rotation operation unit (command operation means) 406, a high resistance 407, and a low resistance 408. Has been. The CPU 402 includes an operation torque control unit (operation force control means) 410, a memory 411, a position calculation unit 412, and a communication unit (output unit) 413. The demand device 400 is a device for instructing driving of a zoom lens, which is a movable optical member of the lens device 100, by a user operation, and transmits and receives data between the communication unit 413 and a communication unit (not shown) in the grip device 200. Do. In this embodiment, an operation device that commands driving of a zoom lens will be described. However, an operation device that commands driving of a movable optical member such as a focus lens or an iris may be used.

  Hereinafter, each component will be described.

  The rotation operation unit 406 of the demand device 400 is an operation unit (an operation unit without an end) having a rotation mechanism that has no rotation end and can be continuously rotated, and is operated by a user.

  The motor 401 is connected to the rotation operation unit 406 via a gear train, and the motor 401 also rotates according to the rotation of the rotation operation unit 406.

  The circuit switch 403 is a switch for switching whether the resistance between the terminals of the motor 401 is the high resistance 407 or the low resistance 408. The circuit switch 403 is connected to the CPU 402 and switches between the high resistance 407 and the low resistance 408 under the control of the operation torque control unit 410 configured in the CPU 402. The motor 401 and the circuit switch 403 give an operation torque (operation force) to the rotation operation unit 406. The operation torque application principle is the same as in the first embodiment.

  The position detector 404 is a rotary encoder, for example, and is connected to the rotation operation unit 406 via a gear train, and outputs a pulse signal corresponding to the amount of rotation of the rotation operation unit 406. The counter 405 counts the number of pulses of the pulse signal output from the position detector 404 and transmits it to the CPU 402. A position calculation unit 412 configured in the CPU 402 calculates the rotation position of the rotation operation unit 406 from the signal of the position detector 404. The zoom lens drive command position corresponding to the rotational position is transmitted to the grip device 200 via the communication unit 413. The grip device 200 drives the zoom lens according to the drive command position by a driving unit (not shown). The grip device 200 transmits the current position of the zoom lens to the CPU 402 via a communication unit (not shown). Therefore, the CPU 402 instructs the driving of the zoom lens of the lens apparatus 100 via the communication unit 413 and receives the current position of the zoom lens.

  The operating torque control unit 410 is configured in the CPU 402 and switches the state of the circuit switch 403 by pulse width modulation (PWM) control. A pulse width ratio (duty ratio) is determined in accordance with the operation torque setting stored in advance, and PWM control is performed at a predetermined frequency. The memory 411 is configured in the CPU 402 and stores setting values such as operation torque.

  Next, an operation torque setting method in the present embodiment will be described.

  As described in the first embodiment, when the operation torque is applied by the counter electromotive force, the braking torque can be changed by controlling the flowing current amount. In the first embodiment, the example in which the short operation state is set as the state for setting the maximum operation torque and the open state is set as the state for setting the minimum operation torque has been described. In other words, it can be said that the short state is a state in which the resistance value is zero, and the open state is a state in which the resistance value is infinite. That is, it shows a configuration in which the state of different binary resistance values can be switched, and the example of the different binary resistance values is zero on one side and infinite on the other. In the present embodiment, an example will be described in which switching is performed with two different resistance values which are not zero and infinite. The high resistance 407 has a resistance value larger than that of the low resistance 408 and is an arbitrary resistance value. When the terminal of the motor 401 is in the high resistance 407 state, the flowing current is minimized, so that the minimum operating torque is obtained. In addition, when the resistance between the terminals of the motor 401 is a low resistance 408, the flowing current becomes the maximum and the maximum operating torque.

  Further, the operating torque control unit 410 controls switching of the circuit switch 403 at a predetermined frequency, and controls the ratio (duty ratio) of the time for the high resistance 407 state and the time for the low resistance 408 state. . Therefore, since the current amount can be controlled between the current amount at the time of the high resistance 407 and the current amount at the time of the low resistance 408, an arbitrary operation torque between the maximum operation torque and the minimum operation torque can be set. it can. The predetermined frequency is set to a high value such that a change in operation torque due to switching between the high resistance 407 state and the low resistance 408 state cannot be recognized by the user. For example, 40 Hz or more, preferably 70 Hz or more, more preferably 100 Hz or more.

  FIG. 6 is a flowchart showing the flow of motor control in the third embodiment.

  First, in step S20, it is determined whether or not the rotation operation unit 406 has been operated by the user. If there is an operation, the process proceeds to step S21, and if there is no operation, the process proceeds to step S27. In step S27, the circuit switch 403 is set to the low resistance 408 state that provides the maximum operating torque. In step S21, whether or not the drive command for the operation of the rotation operation unit 406 from the current position of the zoom lens received via the communication unit 413 is within the drive range of the zoom lens (region between the telephoto end and the wide angle end). Judging. If it is within the drivable region, the process proceeds to step S22, and if it is outside the drivable region (outside the telephoto end or wide angle end), the process proceeds to step S25.

  If within the drivable range, in step S22, the duty ratio of PWM control is set to a duty ratio corresponding to the operation torque stored in advance in the memory 411. The operation torque may be arbitrarily set by the user. Next, in step S23, the frequency of the PWM control is set to the predetermined frequency described above, and the process proceeds to step S24.

  If it is outside the drivable region, in step S25, the duty ratio of PWM control is set to 50%. Next, in step S26, the frequency of PWM control is set to a frequency lower than the predetermined frequency described above. That is, the operation torque variation due to the switching between the high resistance 407 state and the low resistance 408 state is set to a frequency at which the user can recognize the change in operational feeling. For example, 40 Hz or less, preferably 20 z or less, more preferably 10 Hz or less. The duty ratio of 50% set in step S25 is a desirable value for allowing the user to recognize the switching of the circuit switch 403, but is not limited thereto. The same effect can be achieved with any duty ratio.

  Next, in step S24, the circuit switch 403 is PWM controlled based on the duty ratio and frequency set in step S22 and step S23, or step S25 and step S26, and the high resistance 407 state and the low resistance 408 state are set. Switch.

  In this embodiment, in step S21, it is determined whether the drive command for the operation of the rotation operation unit 406 is within the movable region of the zoom lens (the region between the telephoto end and the wide-angle end) or outside the movable region. However, the present invention is not limited to this. For example, whether the zoom lens is in a region excluding predetermined end portions of the movable region or whether it is outside the region may be used as a determination criterion. In this case, the operator can recognize from the operational feeling that the driving is in the vicinity of the driving end.

  As for the frequency in the PWM control, the operation torque is changed by changing the duty ratio under the condition of a predetermined constant frequency. However, the present invention is not limited to duty ratio control under a constant frequency, and similar effects can be obtained even with duty ratio control under a non-constant frequency. That is, by changing the frequency so as to fluctuate in a range including the frequency of 40 Hz or less, preferably 20 Hz or less, more preferably 10 Hz or less that can be recognized as an operation feeling by the user, You may make it recognizable as a change of operation feeling.

  As described above, in this embodiment, the method for setting a desired operation torque by switching between different binary resistance values has been described. By setting different binary resistance values, it is possible to set an operation torque that is too heavy or too light. In addition, when commanding the drive of the movable optical member by the rotation operation unit that has no rotation end and can be continuously rotated, even if the operation exceeds the movable range of the movable optical member, the user cannot recognize it, so the operability is improved. bad. With respect to this problem, in this embodiment, when the operation exceeding the movable range of the movable optical member is performed, the PWM control is performed at a low frequency, so that the fluctuation of the operation torque due to the switching of the operation torque can be recognized. In other words, it is possible to convey the feeling of buzzing to the user. Therefore, since the user can recognize the end of the movable range, the operability is improved.

  In the present embodiment, an example of switching between two different resistance values has been described. However, the present invention is not limited to this, and it is naturally possible to adopt a configuration in which the short state and the open state are switched as in the first embodiment. good.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

101 Zoom lens operation unit (operation means)
201, 401 Motor (DC electric means)
203, 403 Circuit switcher (switching means)
210, 410 Operation torque control unit (control means)
406 Rotation operation unit (operation means)

Claims (10)

  A lens control device for controlling an operation torque of an operation means for operating a position of a movable optical member of a lens device, wherein a resistance value between a DC electric means connected to the operation means and a terminal of the DC electric means is switched. A lens control apparatus comprising: a switching unit; and a control unit that controls an operation torque of the operation unit by periodically repeating the switching by the switching unit.   The lens control device according to claim 1, wherein the switching unit switches the resistance value between a first resistance value and a second resistance value.   The lens control device according to claim 1, wherein the switching unit switches a short circuit and an open state between terminals of the DC electric unit.   The lens control device according to claim 1, wherein the control unit controls the magnitude of the operation torque by changing a duty ratio of switching by the switching unit.   The lens control device according to claim 4, wherein the control unit changes the duty ratio according to an operation speed of the operation unit.   The lens control device according to claim 1, wherein the control unit controls the switching unit so that a switching frequency by the switching unit is 40 Hz or more. A lens device comprising: a movable optical member; and an operating means connected to the movable optical member and operating a position of the movable optical member;
The lens control device according to any one of claims 1 to 6,
An imaging apparatus comprising: Command means for commanding driving of the movable optical member;
Drive means for driving the DC electric means based on a command from the command means;
The photographing apparatus according to claim 7, further comprising: A lens device having a movable optical member, and a driving means for driving the movable optical member;
An operation device connected to the lens device, wherein the lens control device according to any one of claims 1 to 6 and a drive command for driving the movable optical member based on an operation amount of the operation means. And an output unit that outputs the output to the driving means,
An imaging apparatus comprising: The operation means can be rotated without an end,
When the drive command by the operation means tries to command a position outside the movable area of the movable optical member, the control means causes the switching means to operate at a frequency lower than the frequency when commanding the inside of the movable area. Control,
The imaging apparatus according to claim 9.

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