Drive unit and system having the same

Abstract

To provide a drive device that stops control of the built-in extender while the magnification can be manually switched. [Solution] The drive device is a drive device that can be attached to a lens device which has a driven part for changing the position of an optical member in a plane perpendicular to the optical axis, and comprises a drive unit for driving the driven part, and a control unit for controlling the drive unit so that when the driven part is operated manually the drive unit stops in a non-interference state so as not to interfere with the driven part.

Description

Technical Field

[0001] The present invention relates to a driving device for driving an optical member included in a lens device.

Background Art

[0002] Conventionally, there is known a driving device that can be attached to a lens device equipped with a built-in extender that can manually switch the magnification of the entire device and can electrically control the built-in extender (see Patent Documents 1 and 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to provide a driving device that stops controlling a built-in extender in a state where the magnification can be manually switched.

Means for Solving the Problems

[0005] A driving device according to one aspect of the present invention is a driving device that can be attached to a lens device including a driven part for changing the position of an optical member in a plane perpendicular to the optical axis, the driving device including: a driving part for driving the driven part; and a control part for controlling the driving part so that the driving part stops in a non-interference state where the driving part does not interfere with the driven part when the driven part is manually operated.

Effects of the Invention

[0006] According to the present invention, it is possible to provide a drive device that stops the control of the built-in extender while the magnification can be manually switched. [Brief explanation of the drawing]

[0007] [Figure 1] This is a block diagram of the system in Example 1. [Figure 2] This flowchart shows the switching of the optical member positions in Example 1 and Example 2. [Figure 3] This is a timing chart showing the detection state of the drive unit state detection unit and the contact state between the drive unit and the optical unit position switching unit in Example 1, relative to the position of the optical member. [Figure 4] These are block diagrams of the systems of Examples 2 to 4. [Figure 5] This is a timing chart showing the detection status of each detection system relative to the position of the optical element in Example 2. [Figure 6] This is a flowchart showing the switching of the position of the optical element in Example 3. [Figure 7] This is a timing chart showing the detection status of each detection system relative to the position of the optical element in Example 3. [Figure 8] This is a flowchart showing the switching of the position of the optical element in Example 4. [Figure 9] This is a flowchart showing the monitoring of mutual exclusion in Example 4. [Modes for carrying out the invention]

[0008] The embodiments of the present invention will be described in detail below with reference to the drawings. In each figure, the same reference numeral is used for identical components, and redundant explanations are omitted. The overall magnification of the device can be manually switched. When a lens device equipped with a built-in extender that allows manual switching of the overall magnification of the device is fitted with a drive unit that can electrically control the built-in extender, the magnification is usually switched electrically. However, in emergencies such as communication errors, there may be cases where the magnification must be switched manually. In such cases, depending on the configuration and control method of the drive unit, the control may terminate before the magnification can be switched manually. The present invention aims to solve this problem. [Examples]

[0009] Figure 1 is a block diagram of the system of this embodiment. The system of this embodiment has an optical element drive device (drive device) 1 and a lens device 2 to which the optical element drive device 1 can be attached for mechanical and electrical connections. The optical element drive device 1 has a control unit 100, a drive unit 110, and a drive unit state detection unit (detection unit) 120. The lens device 2 is, for example, a handy lens for broadcasting and has an optical element position switching unit (driven unit) 210 and an optical element 200.

[0010] The control unit 100 is, for example, a CPU and its peripheral circuits, and controls the operation of the functions provided by the optical element driving device 1. The drive unit 110 includes a motor and gears, and drives the optical element position switching unit 210 when the optical element driving device 1 is mounted on the lens device 2. In this embodiment, the drive unit 110 is configured to move in a single direction. The drive unit 110 also includes a magnetic material 111. The magnetic material 111 is used by the drive unit state detection unit 120 to detect the state of the drive unit 110. The drive unit state detection unit 120 is, for example, a Hall IC, and notifies the control unit 100 of information regarding the state of the drive unit 110 as a detection result.

[0011] The optical member 200 is a lens that switches the magnification of the lens device 2. The optical member position switching unit 210 is used to switch (change) the position of the optical member 200 in a plane perpendicular to the optical axis. The switching of the position of the optical member 200 is performed by the driving unit 110 contacting the optical member position switching unit 210 and applying a force, or by the user of the lens device 2 directly operating the optical member position switching unit 210.

[0012] Hereinafter, the switching of the position of the optical member 200 by the optical member driving device 1 of the present embodiment (by the driving unit 110 contacting the optical member position switching unit 210 and applying a force) will be described. FIG. 2 is a flowchart showing the switching of the position of the optical member 200 of the present embodiment.

[0013] In step S201, the control unit 100 determines whether an instruction to change the target position of the optical member 200 has been given. If the control unit 100 determines that an instruction to change the target position has been given, it executes the process of step S202. If it determines otherwise, it continues the process of this step.

[0014] In step S202, the control unit 100 determines whether the current position of the optical member 200 is different from the target position. The current position of the optical member 200 is detected using, for example, the state of the driving unit 110 detected by the driving unit state detection unit 120, or the initial position of the optical member 200 at the start of the lens device 2 and the number of times detected by the driving unit state detection unit 120. If the control unit 100 determines that the two positions are different, it executes the process of step S203. If it determines otherwise, it executes the process of step S201.

[0015] In step S203, the control unit 100 executes a first drive (first control) for controlling the driving unit 110 until it is notified of a change in the state of the driving unit 110 from the driving unit state detection unit 120 (the optical member 200 reaches the target position).

[0016] In step S204, the control unit 100 determines whether or not a change in the state of the drive unit 110 is notified from the drive unit state detection unit 120. When the control unit 100 determines that a change in the state of the drive unit 110 is notified, it executes the process of step S205. When it determines otherwise, it continues the process of this step.

[0017] In step S205, first, the control unit 100 ends the first drive. Next, when the user directly operates the optical member position switching unit 210 to switch the position of the optical member 200, the control unit 100 executes a second drive (second control) to control until the drive unit 110 is in a state (non-interference state) where it does not interfere (contact) with the optical member position switching unit 210.

[0018] In step S206, the control unit 100 determines whether or not a first predetermined time (second predetermined time) has elapsed. When the control unit 100 determines that the first predetermined time has elapsed, it executes the process of step S207. When it determines otherwise, it continues the process of this step. The first predetermined time is the time required for the drive unit 110 to enter the non-interference state, and in this embodiment, it is set in consideration of the maximum and minimum values of the tolerances related to electricity and mechanics of the drive unit 110 and the drive unit state detection unit 120. Note that the first predetermined time can be updated (changed) by adding or subtracting an arbitrary time from the preset time.

[0019] In step S207, the control unit 100 determines whether or not the current position of the optical member 200 matches the target position. When the control unit 100 determines that the two positions match, it executes the process of step S208. When it determines otherwise, it executes the process of step S203.

[0020] In step S208, the control unit 100 ends the second drive.

[0021] In this embodiment, it is determined whether or not to terminate the second drive after a predetermined first time has elapsed, but the present invention is not limited thereto. For example, a position detection means, such as an encoder, that detects the absolute or relative position of the drive unit 110 may be provided, and the system may be configured to determine whether or not the drive unit 110 is in a non-interference state according to the absolute or relative position of the drive unit 110.

[0022] By performing the above process, the drive unit 110 stops in an interference-free state, without interfering with the optical element position switching unit 210. Therefore, when a user touches and operates the optical element position switching unit 210, the optical element position switching unit 210 can switch the position of the optical element 200 without interfering with the drive unit 110.

[0023] The following describes the relationship between the output signal of the drive unit state detection unit 120 and the presence or absence of interference between the drive unit 110 and the optical unit position switching unit 210 when the position of the optical member 200 is switched in this embodiment. Figure 3 is a timing chart showing the detection state of the drive unit state detection unit 120 and the contact state between the drive unit and the optical unit position switching unit with respect to the position of the optical member 200 in this embodiment. The horizontal axis of Figure 3 represents the position of the drive unit 110.

[0024] Timing chart A shows whether the drive unit state detection unit 120 is detecting the magnetic material 111 or not.

[0025] Timing chart B shows whether or not there is interference between the drive unit 110 and the optical element position switching unit 210. If there is interference, the position of the optical element 200 cannot be switched by directly operating the optical element position switching unit 210.

[0026] Timing chart C shows the position of the optical element 200. Positions A and B are the positions where the optical element 200 is located. For example, position A is the position where the optical element 200 is located on the optical axis of the lens device 2, and position B is the position where the optical element 200 is not located on the optical axis of the lens device 2.

[0027] Position 301 is the position where the flow shown in Figure 2 begins when the target position is position B, and is the position where the first drive begins when driving from position A to position B.

[0028] Position 302 is the position in the flow of Figure 2 where, when the target position is position B, the first drive ends and the second drive begins, and it is the position where the drive unit state detection unit 120 begins to detect the state of the drive unit 110.

[0029] Position 303 is the position where the second drive ends in the flow of Figure 2 when the target position is position B, and is the position reached after a predetermined time has elapsed from the start of the second drive.

[0030] By arranging the components as shown in Figure 3, the first drive completes the switching of the optical element 200's position, and the second drive results in a non-interference state where the drive unit 110 does not interfere with the optical element position switching unit 210.

[0031] Note that in Figure 3, position 302 is the position where the drive unit state detection unit 120 begins to detect the state of the drive unit 110, but it may also be the position where detection ceases. The same effect can be obtained by adjusting the first predetermined time and driving the drive unit 110 to a position where it does not interfere with the optical member position switching unit 210 during the second drive.

[0032] As described above, according to the configuration of this embodiment, the drive unit 110 is controlled to stop in an interference-free state without interfering with the optical element position switching unit 210. This makes it possible to suppress interference between the optical element position switching unit 210 and the drive unit 110 when the optical element position switching unit 210 is operated manually to switch the position of the optical element 200. [Examples]

[0033] This embodiment differs from Embodiment 1 in that it includes a detection system. In this embodiment, only the configurations that differ from Embodiment 1 will be described, and the same components as in Embodiment 1 will be given the same reference numerals and their descriptions will be omitted.

[0034] Figure 4 is a block diagram of the system of this embodiment. The system of this embodiment includes an optical element drive device (drive device) 3 and a lens device 4 to which the optical element drive device 3 can be attached for mechanical and electrical connections. The optical element drive device 3 has a drive circuit section 300 in addition to the configuration of the optical element drive device 1 of Embodiment 1. The lens device 4 has a lens device control section 400, an optical element position detection section 410, and a temperature detection section 420 in addition to the configuration of the lens device 2 of Embodiment 1.

[0035] The drive circuit unit 300 receives a command from the control unit 100, generates a driving force to drive the drive unit 110, and also feeds back the circuit state to the control unit 100. The circuit state is, for example, the voltage value applied to the drive unit 110 or the current value flowing through the drive unit 110.

[0036] The lens device control unit 400 is, for example, a CPU and its peripheral circuits, and controls the operation of the functions provided by the optical element drive device 3. The lens device control unit 400 is also configured to communicate with the control unit 100. The optical element position detection unit 410 detects the position information of the optical element 200 and notifies the lens device control unit 400 of the detected position information. By detecting the current position of the optical element 200 with the optical element position detection unit 410, it becomes unnecessary to determine the initial position of the optical element 200 and to count the number of detections by the drive unit state detection unit 120. The temperature detection unit 420 is, for example, a temperature sensor, and detects the ambient temperature of the lens device 4 and notifies the lens device control unit 400.

[0037] In this embodiment, the position of the optical element 200 is switched according to the flow shown in Figure 2. The explanation of Figure 2 was given in Embodiment 1, so it will be omitted here.

[0038] The following describes the relationship between the position of the optical element 200 and the state of each detection system when the position of the optical element 200 is switched in this embodiment. Figure 5 is a timing chart showing the detection state of each detection system in relation to the position of the optical element 200 in this embodiment. The horizontal axis of Figure 5 represents the position of the drive unit 110. Figure 5 differs from Figure 3 in that it adds the detection state of the optical element position detection unit 410 and the current value detected by the drive circuit unit 300.

[0039] Since timing charts A through C are the same as those in Figure 3, their explanations will be omitted.

[0040] Timing chart D shows the detection state of the optical element position detection unit 410. The detection state of the optical element position detection unit 410 changes the moment the position of the optical element 200 switches.

[0041] Timing chart E represents the current value detected by the drive circuit unit 300. The current value detected by the drive circuit unit 300 differs in magnitude depending on whether the position of the optical element 200 is switched or not, depending on whether the drive unit 110 is applying force to the optical element position switching unit 210. The current value when the optical element is not switched is equivalent to the no-load current.

[0042] Here, the setting of the first predetermined time in this embodiment will be explained. The first predetermined time may be set using the circuit state obtained by the drive circuit unit 300. The rotational speed of the drive unit 110 can be calculated using the voltage value applied to the drive unit 110, the current value flowing through the drive unit 110, and the specifications parameters of the drive unit 110, and the time during which the drive unit 110 is in an uninterfering state can be calculated from the calculated rotational speed.

[0043] Furthermore, the first predetermined time may be set using the ambient temperature obtained by the temperature detection unit 420. By using the ambient temperature, it is possible to take into account the temperature changes of the specifications parameters of the drive unit 110, and to calculate the first predetermined time with greater accuracy.

[0044] As described above, according to the configuration of this embodiment, in addition to the effects of Embodiment 1, it is possible to improve the accuracy of the switching control of the optical element position switching unit 210. [Examples]

[0045] The configuration of the optical element driving device (driving device) 3 and the lens device 4 in this embodiment is the same as in Embodiment 2, so a description will be omitted. In this embodiment, only the configurations that differ from Embodiments 1 and 2 will be described, and the same reference numerals will be used for the same components as in Embodiments 1 and 2, and their descriptions will be omitted.

[0046] The following describes how the optical element 200 is switched by the optical element driving device 3 in this embodiment. Figure 6 is a flowchart showing how the optical element 200 is switched in this embodiment.

[0047] The processes in steps S201 to S203 are the same as those in steps S201 to S203 in Figure 2, so their explanation will be omitted.

[0048] In step S601, the control unit 100 determines whether or not a change in the state of the drive unit 110 has been notified by the drive unit state detection unit 120. If the control unit 100 determines that a change in the state of the drive unit 110 has been notified, it executes the process in step S602; otherwise, it continues the process in this step.

[0049] In step S602, the control unit 100 first terminates the first drive. Next, when the switching of the position of the optical member 200 is initiated, the control unit 100 starts a third drive that controls the drive unit 110 until it reaches a position (hereinafter referred to as the predetermined position) where the switching of the position of the optical member 200 is immediately initiated.

[0050] In step S603, the control unit 100 determines whether a second predetermined time has elapsed. If the control unit 100 determines that a second predetermined time has elapsed, it executes the process in step S604; otherwise, it continues the process in this step. The second predetermined time is the time required for the drive unit 110 to reach a predetermined position. The second predetermined time is the time required for the drive unit state detection unit 120 to stop detecting the state of the drive unit, and in this embodiment, it is set considering the maximum and minimum values ​​of the electrical and mechanical tolerances of the drive unit 110 and the drive unit state detection unit 120.

[0051] In step S604, the control unit 100 determines whether the current position of the optical member 200 matches the target position. If the control unit 100 determines that the two positions match, it executes the process in step S605; otherwise, it executes the process in step S203.

[0052] In step S603, the control unit 100 terminates the third drive.

[0053] The following describes the position at which the control for switching the position of the optical element 200 ends during position switching of the optical element 200 in this embodiment. Figure 7 is a timing chart showing the detection state of each detection system with respect to the position of the optical element 200 in this embodiment. The horizontal axis of Figure 7 represents the position of the drive unit 110. In Figure 7, the start and end positions of the control for switching the position of the optical element 200 are different from those in Figure 5.

[0054] Since timing charts A through C are the same as those in Figure 3, their explanations will be omitted.

[0055] Timing charts D and E are the same as those in Figure 5, so their explanations are omitted.

[0056] Position 701 is the position where the flow in Figure 6 begins when the target position is position B, and is the position where the first drive begins when driving from position A to position B.

[0057] Position 702 is the position in the flow of Figure 6 where, when the target position is position B, the first drive is terminated and the third drive is started, and it is the position where the drive unit state detection unit 120 begins to detect the state of the drive unit 110.

[0058] Position 703 is the position where the third drive ends in the flow of Figure 6 when the target position is position B, and is the position reached after a second predetermined time has elapsed from the start of the third drive.

[0059] By setting the position 703 as shown in Figure 7, the position of the optical element 200 can be controlled to switch immediately after the start of the switching control of the position of the optical element 200 (within the first predetermined time).

[0060] As described above, according to the configuration of this embodiment, in addition to the effects of Embodiments 1 and 2, it is possible to immediately switch the position of the optical element 200 when the next switching control of the optical element 200 is started. [Examples]

[0061] This embodiment differs from Embodiment 3 in that it takes mutual exclusion into consideration. Mutual exclusion is a control system that, when permission to execute multiple functions is received, prioritizes the execution of a specific function and does not permit the execution of other functions until the execution of that specific function is completed. In this embodiment, mutual exclusion is implemented based on a prediction of whether the sum of the usable power (power consumption) of the optical element drive device and the lens device exceeds a predetermined value.

[0062] The configuration of the optical element driving device (driving device) 3 and the lens device 4 in this embodiment is the same as in Embodiment 2, so a description will be omitted. In this embodiment, only the configurations that differ from Embodiments 1 to 3 will be described, and the same reference numerals will be used for the same components as in Embodiment 2, and their descriptions will be omitted.

[0063] The following describes how the optical element 200 is switched by the optical element driving device 3 in this embodiment. Figure 8 is a flowchart showing how the optical element 200 is switched in this embodiment.

[0064] In step S801, the control unit 100 determines whether or not it has been instructed to change the target position of the optical member 200. If the control unit 100 determines that it has been instructed to change the target position, it executes the process in step S802; otherwise, it continues the process in this step.

[0065] In step S802, the control unit 100 determines whether the current position of the optical element 200 is different from the target position. If the control unit 100 determines that the two positions are different, it executes the process in step S803; otherwise, it executes the process in step S801.

[0066] In step S803, the control unit 100 sends a request to the lens device control unit 400 to drive the drive unit 110.

[0067] In step S804, the control unit 100 determines whether or not it has received permission to drive the drive unit 110 from the lens device control unit 400. If the control unit 100 determines that it has received permission to drive the drive unit 110, it executes the process in step S203; otherwise, it executes the process in step S803.

[0068] In step S805, the control unit 100 sends a notification to the lens device control unit 400 that the drive unit 110 has completed its operation.

[0069] The following describes the exclusive control of the lens device 4 by the lens device control unit 400 in this embodiment. Figure 9 is a flowchart showing the monitoring of the exclusive control.

[0070] In step S901, the lens device control unit 400 determines whether or not it has received a function execution permission. A function execution permission is a trigger signal that allows the lens device control unit 400 to determine whether it is permitted to execute the functions of the optical element drive device 3 and the lens device 4. The request for drive of the drive unit 110 transmitted by the control unit 100 to the lens device control unit 400 in step S803 in Figure 8 is treated as a function execution permission. If the lens device control unit 400 determines that it has received a function execution permission, it executes the process in step S902; otherwise, it continues the process in this step.

[0071] In step S902, the lens device control unit 400 determines whether or not exclusive control is necessary based on the function execution permission received in step S901. If the lens device control unit 400 determines that exclusive control is necessary, it executes the process in step S903; otherwise, it executes the process in step S904.

[0072] In step S903, the lens device control unit 400 starts mutual exclusion control.

[0073] In step S904, the lens device control unit 400 authorizes the execution of a function based on the function execution permission. The permission in this step is treated, for example, as permission to drive the drive unit 110 in step S804 in Figure 8.

[0074] In step S905, the lens device control unit 400 determines whether the execution of the function based on the function execution permission that triggered the start of exclusive control in step S903 has finished. If the lens device control unit 400 determines that the execution of the function has finished, it executes the process in step S906; otherwise, it executes the process in step S907. The completion notification of the drive unit 110, which is transmitted in step S805 in Figure 8, is used for this determination.

[0075] In step S906, the lens device control unit 400 terminates the mutual exclusion control.

[0076] In step S907, the lens device control unit 400 determines whether or not it has received permission to perform a function. If the lens device control unit 400 determines that it has received permission to perform a function, it executes the process in step S908; otherwise, it executes the process in step S905.

[0077] In step S908, the lens device control unit 400 determines whether the function based on the function execution permission transmitted in step S907 is subject to exclusive control. If the lens device control unit 400 determines that the function is subject to exclusive control, it executes the process in step S909; otherwise, it executes the process in step S904.

[0078] In step S909, the lens device control unit 400 refuses to execute the function based on the function execution permission transmitted in step S907.

[0079] As shown in Figure 7, since the detected current is small during the execution of the third drive, mutual exclusion control becomes unnecessary. Therefore, by sending a drive completion notification to the lens device control unit 400 as shown in Figure 8, the mutual exclusion control described in Figure 9 can be terminated before the switching control of the position of the optical element 200 is completed. This reduces the waiting time for the execution of other functions due to the execution of mutual exclusion control.

[0080] As described above, the configuration of this embodiment makes it possible to shorten the time required for exclusive control when switching the position of the optical element 200.

[0081] This embodiment includes the following configuration. (Composition 1) A drive device that can be attached to a lens device having a driven part for changing the position of an optical element in a plane perpendicular to the optical axis, A drive unit that drives the driven unit, A drive device characterized by having a control unit that controls the drive unit so that when the driven unit is operated manually, the drive unit stops in a non-interference state without interfering with the driven unit. (Configuration 2) The drive device according to configuration 1, characterized in that the control unit controls the drive unit based on the position information of the optical member. (Composition 3) The drive device according to configuration 1 or 2, characterized in that the control unit controls the drive unit so that the optical member moves within a first predetermined time after the control of the drive unit is started. (Composition 4) The drive device according to any one of configurations 1 to 3, characterized in that the control unit performs a first control to control the drive unit until the optical member reaches the target position, and then performs a second control to control the drive unit until the drive unit enters the non-interference state. (Composition 5) The system further includes a detection unit for detecting the state of the drive unit, The drive device according to configuration 4, characterized in that the control unit switches from the first control to the second control based on the detection result of the detection unit. (Composition 6) The drive device according to configuration 5, characterized in that the detection unit is a Hall IC that detects the magnetic material provided by the drive unit. (Composition 7) The drive device according to any one of configurations 4 to 6, characterized in that the control unit performs the second control for a second predetermined time until the drive unit returns to the non-interference state after completing the first control. (Composition 8) The drive device according to configuration 8, characterized in that the second predetermined time is changeable. (Composition 9) The drive device according to configuration 7 or 8, characterized in that the second predetermined time is set based on the current flowing through the drive unit and the voltage applied to the drive unit. (Composition 10) The drive device according to any one of configurations 7 to 9, characterized in that the second predetermined time is set based on the ambient temperature of the lens device. (Composition 11) The drive device according to any one of configurations 1 to 10, characterized in that the control unit determines whether or not to control the drive unit in response to communication with the lens device. (Composition 12) The drive device according to configuration 11, characterized in that the control unit determines whether or not to control the drive unit based on the result of predicting whether or not the sum of the power consumption of the lens device and the drive device exceeds a predetermined value. (Composition 13) The drive device according to configuration 12, characterized in that when the control unit predicts that the sum of the power consumption of the lens device and the drive device exceeds the predetermined value, it executes a control different from the control of the drive unit. (Composition 14) The drive unit is characterized by moving in a single direction, as described in any one of configurations 1 to 13. (Composition 15) A drive device described in any one of configurations 1 to 14, A system characterized by having a lens device to which the drive device can be attached.

[0082] Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of its gist. [Explanation of symbols]

[0083] 1. Optical component drive device (drive device) 2 Lens device 100 Control Unit (Control Unit) 110 Drive unit 200 Optical Components 210 Optical element position switching unit (driven unit)

Claims

1. A drive device that can be attached to a lens device having a driven part for changing the position of an optical element in a plane perpendicular to the optical axis, A drive unit that drives the driven unit, A drive device characterized by having a control unit that controls the drive unit so that when the driven unit is operated manually, the drive unit stops in a non-interference state without interfering with the driven unit.

2. The drive device according to claim 1, characterized in that the control unit controls the drive unit based on the position information of the optical member.

3. The drive device according to claim 1 or 2, characterized in that the control unit controls the drive unit so that the optical member moves within a first predetermined time after the control of the drive unit is started.

4. The drive device according to claim 1 or 2, characterized in that the control unit performs a first control to control the drive unit until the optical member reaches the target position, and then performs a second control to control the drive unit until the drive unit is in the non-interference state.

5. The system further includes a detection unit for detecting the state of the drive unit, The drive device according to claim 4, characterized in that the control unit switches from the first control to the second control based on the detection result of the detection unit.

6. The drive device according to claim 5, characterized in that the detection unit is a Hall IC that detects the magnetic material provided by the drive unit.

7. The drive device according to claim 4, characterized in that the control unit performs the second control for a second predetermined time until the drive unit returns to the non-interference state after completing the first control.

8. The drive device according to claim 7, characterized in that the second predetermined time is changeable.

9. The drive device according to claim 7, characterized in that the second predetermined time is set based on the current flowing through the drive unit and the voltage applied to the drive unit.

10. The drive device according to claim 7, characterized in that the second predetermined time is set based on the ambient temperature of the lens device.

11. The drive device according to claim 1 or 2, characterized in that the control unit determines whether or not to control the drive unit in response to communication with the lens device.

12. The drive device according to claim 11, characterized in that the control unit determines whether or not to control the drive unit based on the result of predicting whether or not the sum of the power consumption of the lens device and the drive device exceeds a predetermined value.

13. The drive device according to claim 12, characterized in that the control unit performs a control different from the control of the drive unit when it predicts that the sum of the power consumption of the lens device and the drive device will exceed the predetermined value.

14. The drive unit is characterized in that it moves in a single direction, as described in claim 1 or 2.

15. A drive device according to claim 1 or 2, A system characterized by having a lens device to which the drive device can be attached.

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