JP2009015023A - DRIVE DEVICE AND IMAGING DEVICE HAVING THE SAME - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive device that can be driven with higher accuracy by using less magnetic force detection means and an image pickup apparatus having the drive device.
SOLUTION: A magnetic force detection unit 3 is held by a movable unit 4, and the movable unit 4 is slid in directions X and Y intersecting in the same plane with an arrangement direction Z of N and S poles in a magnetic field generating member 1. Hold as possible. If the movable part 4 moves in the Y direction in which the relative distance between the magnetic field generation member 1 and the magnetic force detection part 3 is increased, the amplitude of the magnetic force detected by the magnetic force detection part 3 decreases, and the magnetic field generation member 1 and the magnetic force detection part. If the movable part 4 moves in the X direction in which the relative distance to 3 is shortened, the amplitude of the magnetic force detected by the magnetic force detection part 3 increases. Therefore, the sliding direction of the movable part 4 is detected based on the amplitude of the magnetic force that changes with the movement of the movable part 4, and the drive part 7 slides the movable part 4 based on the detection result, thereby reducing the magnetic force. It is possible to drive with higher accuracy using the detection means.
[Selection] Figure 1

Description

  The present invention relates to a drive device and an image pickup apparatus including the drive device, and more particularly, to a drive device that can be driven based on the detected magnetic force by detecting the magnetic force and an image pickup apparatus including the drive device.

  As a driving device used in various imaging devices such as a digital camera, an optical lens such as a zoom lens and a focus lens is held on a driving shaft, and the optical lens can be moved along the driving shaft. There is. Such a drive device includes a magnetic field generating member in which an N pole and an S pole are arranged in a direction parallel to the drive shaft, and the magnetic force generated from the magnetic field generating member is detected and detected. Some optical lenses can be moved based on the magnetic force (for example, Patent Document 1).

In the technique disclosed in Patent Document 1, as the optical lens moves along the drive shaft, the magnetic field generating member moves in a direction parallel to the drive shaft, and the magnetic force generated from the magnetic field generating member changes. Is detected by a fixed sensor, so that the optical lens can be positioned.
JP 2006-214736 A

  However, the configuration disclosed in Patent Document 1 has a problem that the manufacturing cost increases because a plurality of sensors must be provided in order to position the optical lens with high accuracy.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a drive device that can be driven with higher accuracy using fewer magnetic force detection means and an imaging device including the drive device.

  A driving apparatus according to a first aspect of the present invention includes a magnetic field generation unit in which N poles and S poles are alternately arranged on a straight line, a magnetic force detection unit that detects a magnetic force generated from the magnetic field generation unit, and the magnetic field generation unit or A holding means that holds the magnetic force detecting means and is slidable on a straight line that intersects with the arrangement direction of the N and S poles in the same plane, and the magnetic force detecting means when the holding means is sliding Based on the maximum value and minimum value of the magnetic force detected in step 1, the amplitude calculation means for calculating the amplitude of the magnetic force, and the sliding direction of the holding means is detected based on the change in the amplitude calculated by the amplitude calculation means. A slide direction detection unit and a drive unit that slides the holding unit based on the detection result of the slide direction detection unit are configured.

  According to such a configuration, since the arrangement direction of the N pole and the S pole of the magnetic field generating means and the sliding direction of the holding means intersect in the same plane, the magnetic force detecting means as the holding means slides. The amplitude of the magnetic force detected at 1 changes. That is, if the holding means moves in a direction in which the relative distance between the magnetic field generating means and the magnetic force detecting means is increased, the difference between the maximum value and the minimum value of the magnetic force detected by the magnetic force detection means is reduced, so that the amplitude is reduced. If the holding means moves in the direction in which the relative distance between the magnetic field generating means and the magnetic force detecting means is shortened, the difference between the maximum value and the minimum value of the magnetic force detected by the magnetic force detecting means increases, and the amplitude increases.

  Therefore, the sliding direction of the holding means is detected based on the amplitude of the magnetic force that changes with the movement of the holding means, and the driving means slides the holding means based on the detection result, thereby using less magnetic force detecting means. Therefore, it is possible to drive with higher accuracy.

  In addition to the above configuration, the drive device according to the second aspect of the present invention includes a cycle counting unit that counts a cycle of magnetic force detected by the magnetic force detection unit when the holding unit is sliding, and a cycle counting unit. Position detecting means for detecting the position of the holding means based on the counting period and the magnetic force detected by the magnetic force detecting means, and the driving means detects the slide direction detecting means and the position detecting means. Based on the result, the holding means is configured to slide.

  According to such a configuration, the period of the magnetic force detected by the magnetic force detection means when the holding means slides is counted, and the holding is performed based on the counted period and the magnetic force detected by the magnetic force detection means. The position of the means can be detected with higher accuracy.

  According to a third aspect of the present invention, there is provided an image pickup apparatus according to claim 1 or 2, an optical lens held by the holding means such that an optical axis is parallel to the slide direction, and the optical lens. Imaging means having an imaging surface orthogonal to the sliding direction on the optical axis.

  According to such a configuration, it is possible to provide an imaging device including a driving device that exhibits the same effect as that of the first or second aspect of the invention. Therefore, it is possible to provide an imaging device that can drive the optical lens with higher accuracy using fewer magnetic force detection means.

  According to the present invention, the sliding direction of the holding means is detected based on the amplitude of the magnetic force that changes with the movement of the holding means, and the driving means slides the holding means based on the detection result, thereby reducing the magnetic force less. It is possible to drive with higher accuracy using the detection means.

  FIG. 1 is a perspective view showing an example of a drive device according to an embodiment of the present invention. The drive device includes a magnetic field generating member 1, a support plate 2, a magnetic force detection unit 3, a movable unit 4, a drive shaft 5, a counter shaft 6, a drive unit 7, and an attachment unit 8, and generates a magnetic force generated from the magnetic field generation member 1. The movable portion 4 is moved in the axial direction of the drive shaft 5 by detecting the magnetic force detection portion 3 and driving the drive portion 7 based on the magnetic force.

  The magnetic field generating member 1 is magnetic field generating means in which N poles and S poles are alternately arranged on a straight line, and the arrangement direction Z of the N poles and S poles intersects the drive shaft 5 in the same plane. It is supported by the support plate 2. The magnetic force detection unit 3 is a magnetic force detection unit such as a magnetic sensor that detects the magnetic force generated from the magnetic field generation member 1, and is held by the movable unit 4.

  The drive shaft 5 and the sub shaft 6 are arranged so as to extend in parallel with each other, and the drive shaft 5 and the sub shaft 6 are connected by the movable portion 4. More specifically, the press contact portion 4 a formed at one end of the movable portion 4 is pressed against the outer peripheral surface of the drive shaft 5, and the engagement portion 4 b formed at the other end is connected to the sub shaft 6. It is slidably engaged in the axial direction. The auxiliary shaft 6 is disposed closer to the magnetic field generating member 1 than the drive shaft 5, and the magnetic force detecting unit 3 is attached at a position facing the magnetic field generating member 1 at the end of the movable portion 4 on the engaging portion 4 b side. It has been.

  The drive unit 7 is a drive unit including a motor and the like, and the movable unit 4 and the movable unit connected to the drive shaft 5 by moving the drive shaft 5 in the axial direction based on the detection result of the magnetic force detection unit 3. The magnetic force detection unit 3 held by 4 is slid in the X direction or the Y direction. At this time, the auxiliary shaft 6 functions as a guide for stably sliding the movable portion 4. The movable part 4 constitutes a holding means for holding the magnetic force detection part 3 so as to be slidable in the X direction or the Y direction on a straight line intersecting the Z direction. The drive unit 7 is fixed at a predetermined position via the attachment unit 8.

  FIG. 2 is a diagram for explaining the magnetic flux lines 9 of the magnetic field generated from the magnetic field generating member 1. The magnetic field generating member 1 is formed by alternately arranging N poles 1a and S poles 1b each having the same length in the Z direction. As shown in FIG. 2, a magnetic field is formed around the magnetic field generating member 1 such that the magnetic flux lines 9 are directed from the central part of each N pole 1a to the central part of the adjacent S pole 1b. In a state where the magnetic force detection unit 3 is positioned on the magnetic flux lines 9 formed in this way, an electrical signal corresponding to the number of magnetic flux lines 9 passing through the magnetic force detection unit 3 is output from the magnetic force detection unit 3. Thus, the magnetic force at that position can be detected.

  FIG. 3 is a diagram for explaining the intensity of the magnetic field generated from the magnetic field generating member 1. In FIG. 3, the direction of the generated magnetic field is indicated by an arrow 10, and the strength of the magnetic field is indicated by the thickness of the arrow 10. That is, the magnetic field strength is represented by a thick arrow 10 at a position where the magnetic field strength is high and by a thin arrow 10 at a position where the magnetic field strength is low.

  As shown in FIG. 3, the intensity of the magnetic field generated from the magnetic field generating member 1 is the lowest at the central portions a, e, i of the N pole 1a and the S pole 1b, and the boundary between the N pole 1a and the S pole 1b. It is the highest in c and g. And in the intermediate part b, d, f, and h of each of these points, the intensity | strength of a magnetic field is medium. Here, when the distance between the central portions a, e, and i of the N pole 1a and the S pole 1b adjacent to each other is λ, the magnetic field has a constant period of 2λ along the Z direction as shown in the graph of FIG. The strength of the is changing.

  FIG. 4 is a diagram for explaining a change in the voltage output value output from the magnetic force detector 3. As described above, the arrangement direction Z of the N pole 1a and the S pole 1b in the magnetic field generating member 1 and the slide directions X and Y of the magnetic force detection unit 3 intersect in the same plane. That is, the magnetic force detection unit 3 is slidably held in a direction in which the distance between the magnetic force detection units 3 facing each other is different between the one end side and the other end side of the magnetic field generating member 1. Therefore, when the magnetic force detection unit 3 slides the magnetic force detection unit 3 in the X direction approaching the magnetic field generating member 1, the extreme value of the voltage output value output from the magnetic force detection unit 3 increases, and the magnetic force detection unit 3 When the magnetic force detection unit 3 is slid in the Y direction away from the generating member 1, the extreme value of the voltage output value output from the magnetic force detection unit 3 decreases.

  That is, the amplitude W1 between the adjacent maximum value and minimum value of the voltage output value when the magnetic force detection unit 3 is further slid to the X side is the voltage output value when the magnetic force detection unit 3 is further slid to the Y side. Becomes larger than the amplitude W2 between the adjacent maximum and minimum values. Therefore, the sliding direction of the magnetic force detection unit 3 and the movable unit 4 holding the magnetic force detection unit 3 can be detected based on the change in the amplitude when the magnetic force detection unit 3 is sliding.

  FIG. 5 is a perspective view illustrating an example of an imaging device to which the driving device of FIG. 1 is applied. 6 is a front view of the imaging apparatus shown in FIG. 5 and 6 show a state in which each member in the housing 21 is seen through in order to make the structure in the housing 21 easier to understand.

  This imaging apparatus is applied to an optical apparatus such as a digital camera, and can move an optical lens 4c such as a zoom lens or a focus lens along a drive shaft 5. The drive device is accommodated in the housing 21, and the optical lens 4 c is held by the movable portion 4 in the drive device in the housing 21. The drive unit 7 is attached to the housing 21 via the attachment portion 8, and both ends of the auxiliary shaft 6 are fixed to the housing 21. The magnetic field generating member 1 is fixed to the housing 21 via the support plate 2.

  The optical lens 4c is held so that its optical axis is parallel to the slide directions X and Y of the movable portion 4, and is imaged so as to be orthogonal to the slide directions X and Y on the optical axis. An imaging surface of the sensor 20 is formed. Therefore, by driving the drive unit 7 and sliding the movable unit 4 in the X direction or the Y direction, the distance between the optical lens 4c and the image sensor 20 can be changed, and zoom adjustment, focus adjustment, and the like can be performed. It has become. In this example, as the movable part 4 holding the optical lens 4 c moves away from the imaging surface of the image sensor 20, the magnetic field is reduced so that the relative distance from the magnetic force detection part 3 held by the movable part 4 becomes shorter. The generating member 1 is inclined and fixed.

  FIG. 7 is a block diagram illustrating an example of an electrical configuration of the imaging apparatus of FIG. This imaging apparatus includes an AD converter 11, a microcomputer 12, a drive pulse controller 13, and a memory 14. The voltage output value output from the magnetic force detector 3 is converted into a digital signal by the AD converter 11 and input to the microcomputer 12.

  The microcomputer 12 writes data to the memory 14 based on the input signal from the AD converter 11 and outputs a control signal based on the data in the memory 14 to the drive pulse controller 13. The drive pulse control unit 13 inputs a pulse signal to the drive unit 7 based on a control signal from the microcomputer 12 to drive the drive unit 7 and slide the optical lens 4 c held by the movable unit 4. To control.

  FIG. 8 is a functional block diagram showing a configuration example of the microcomputer 12. The microcomputer 12 includes an extreme value detection unit 121, an amplitude calculation unit 122, a slide direction detection unit 123, a position detection unit 124, and a period counting unit 125. These functional blocks are computer programs executed by the microcomputer 12. It is realized by.

  The extreme value detection unit 121 detects the maximum value and the minimum value of the voltage output value output from the magnetic force detection unit 3 when the movable unit 4 is sliding. That is, when the voltage output value output from the magnetic force detection unit 3 transitions from the increasing state to the decreasing state, the voltage output value acquired at that time is detected as a maximum value, and the voltage output value output from the magnetic force detection unit 3 is When transitioning from the decreasing state to the increasing state, the voltage output value acquired at that time can be detected as a local minimum value. The extreme value detection unit 121 detects an extreme value using the extreme value flag 141 assigned to the memory 14.

  Based on the detection result of the extreme value detection unit 121, the amplitude calculation unit 122 calculates the difference between the adjacent maximum value and minimum value of the voltage output value output from the magnetic force detection unit 3 as the amplitude. The amplitude calculator 122 is an amplitude calculator that calculates the amplitude of the magnetic force based on the maximum value and the minimum value of the magnetic force detected by the magnetic force detection unit 3 when the movable unit 4 is sliding. The amplitude calculation unit 122 calculates the amplitude using the update flag 142 assigned to the memory 14.

  The slide direction detection unit 123 is a slide direction detection unit that detects the slide direction of the movable unit 4 based on a change in amplitude calculated by the amplitude calculation unit 122. That is, as described in FIG. 4, if the amplitude calculated by the amplitude calculation unit 122 increases, the sliding direction of the movable unit 4 is detected as the X direction, and if the amplitude decreases, the sliding direction of the movable unit 4 changes to Y. Detected with direction.

  The position detection unit 124 is a position detection unit that detects the position of the movable unit 4 based on the voltage output value output from the magnetic force detection unit 3 and the input signal from the cycle counting unit 125. Here, the cycle counting unit 125 is a cycle counting unit that counts the cycle 2λ of the magnetic field strength change described with reference to FIG. 3 when the movable unit 4 slides. That is, when the movable part 4 is sliding, the number of repetitions of the period 2λ of the magnetic field intensity change is counted, and the magnetic force detection unit 3 is based on the number of repetitions and the period 2λ (for example, 400 μm). The movement distance can be calculated, and the position of the movable part 4 holding the magnetic force detection part 3 can be detected based on the movement distance and the position information before the movement.

  As described above, the sliding direction detection unit 123 detects the sliding direction of the movable unit 4, the position detection unit 124 detects the position of the movable unit 4, and the control signal is sent to the drive pulse control unit 13 based on these detection results. Is output, the movable part 4 can be slid to a desired target position.

  9 and 10 are flowcharts showing an example of processing performed by the microcomputer 12 when the movable unit 4 is slid. When the movable unit 4 is slid, first, in addition to the data stored in the extreme value flag 141 and the update flag 142 of the memory 14, the maximum value and the minimum value of the voltage output value output from the magnetic force detection unit 3 are displayed. Data, amplitude value data, position information of the movable part 4 and the like are initialized, and an initial position of the movable part 4 is set (step S101).

  Thereafter, a voltage output value is acquired from the magnetic force detector 3 at a constant sampling period (step S102). In order to drive the drive device with higher accuracy, the sampling period is preferably as short as possible. If the acquired voltage output value has increased with respect to the previous voltage output value (Yes in step S103), “1” is stored in the extreme value flag 141 (step S104). On the other hand, when the acquired voltage output value has decreased with respect to the previous voltage output value (No in step S103), “2” is stored in the extreme value flag 141 (step S105).

  At this time, if there is data stored in the extreme value flag 141 last time (Yes in step S106), that is, if the extreme value flag 141 before data storage is not “0”, the previously stored data and the current value are stored. The compared data is compared (step S107). And when the data stored this time in the extreme value flag 141 is different from the previous data (No in step S107), that is, when the voltage output value from the magnetic force detection unit 3 transitions between the increasing state and the decreasing state. The voltage output value acquired at that time can be determined as a maximum value or a minimum value.

  In this case, the update flag 142 is incremented by “1” (step S108), and it is determined whether or not the data currently stored in the extreme value flag 141 is “1” (step S109). When the extreme value flag 141 is “1” (Yes in Step S109), that is, when the voltage output value from the magnetic force detection unit 3 is changed from the decrease state to the increase state, the voltage output value acquired at that time is obtained. Is detected as a minimum value by the extreme value detection unit 121, and the minimum value is stored in the memory 14. On the other hand, when the extreme value flag 141 is “2” (No in step S109), that is, when the voltage output value from the magnetic force detection unit 3 transitions from the increasing state to the decreasing state, the voltage output value acquired at that time Is detected as a maximum value by the extreme value detection unit 121, and the maximum value is stored in the memory 14.

  On the other hand, when there is no data previously stored in the extreme value flag 141 (No in step S106), that is, when data is stored in the extreme value flag 141 for the first time after initialization of the memory 14 (step S101). After the data is stored, the process returns to step S102, and the voltage output value is acquired again from the magnetic force detection unit 3 in the next sampling period. Further, when the data stored in the extreme value flag 141 is the same as the previous data (Yes in step S107), that is, the voltage output value from the magnetic force detection unit 3 transitions between the increasing state and the decreasing state. If not, the process returns to step S102 after the data is stored, and the voltage output value is obtained again from the magnetic force detection unit 3 in the next sampling period.

  As described above, when the maximum value or the minimum value of the voltage output value output from the magnetic force detector 3 is detected and stored in the memory 14, the update flag 142 reaches “4” (in step S112). Yes), that is, when the maximum value and the minimum value of the voltage output value are detected four times in total, the amplitude between the maximum value and the minimum value is calculated by the amplitude calculator 122 (step S113). More specifically, the difference between the most recently detected extreme value and the previously detected extreme value is calculated as the amplitude and stored in the memory 14.

  As described above, according to the configuration in which the amplitude is calculated when the maximum value and the minimum value of the voltage output value are detected four times in total, that is, when two sets of the maximum value and the minimum value are detected, the AD converter Eleven conversion errors can be eliminated. However, the present invention is not limited to this configuration, and the amplitude is calculated when the maximum value and the minimum value of the voltage output value are detected twice in total, that is, when one set of the maximum value and the minimum value is detected. The amplitude may be calculated when the maximum value and the minimum value of the voltage output value are detected three times or more, that is, when three or more sets of the maximum value and the minimum value are detected. Also good.

  The amplitude between the maximum value and the minimum value is calculated by the amplitude calculation unit 122 (step S113). When the amplitude value is stored in the memory 14, the amplitude value is compared with the amplitude value previously stored in the memory 14. (Step S114). If the current amplitude value is larger than the previous amplitude value (Yes in step S114), the slide direction detection unit 123 detects the slide direction of the movable unit 4 as the X direction (step S115), and the previous amplitude. If it is smaller than the value (No in step S114), the sliding direction of the movable part 4 is detected as the Y direction (step S116).

  Thereafter, the position detection unit 124 detects the position of the movable unit 4 (step S117). If the position is the target position (Yes in step S118), the drive of the drive unit 7 is stopped. On the other hand, if the movable unit 4 has not yet reached the target position (No in step S118), the process returns to step S102, and the next step while further sliding the movable unit 4 based on the detected sliding direction and position of the movable unit 4. The voltage output value is acquired again from the magnetic force detection unit 3 at the sampling period.

  In the present embodiment, since the arrangement direction Z of the N pole 1a and the S pole 1b of the magnetic field generating member 1 and the sliding directions X and Y of the movable portion 4 intersect in the same plane, the movable portion 4 slides. Accordingly, the amplitude of the magnetic force detected by the magnetic force detection unit 3 changes. That is, if the movable part 4 moves in the Y direction in which the relative distance between the magnetic field generating member 1 and the magnetic force detection part 3 is increased, the difference between the maximum value and the minimum value of the magnetic force detected by the magnetic force detection part 3 is reduced. If the movable part 4 moves in the X direction in which the amplitude decreases and the relative distance between the magnetic field generating member 1 and the magnetic force detection part 3 becomes shorter, the difference between the maximum value and the minimum value of the magnetic force detected by the magnetic force detection part 3 is increased. As it becomes larger, the amplitude increases.

  Therefore, the sliding direction of the movable part 4 is detected based on the amplitude of the magnetic force that changes with the movement of the movable part 4, and the drive part 7 slides the movable part 4 based on the detection result, thereby reducing the magnetic force. It is possible to drive with higher accuracy using the detection means.

  Further, the period of the magnetic force detected by the magnetic force detection unit 3 when the movable unit 4 is sliding is counted, and based on the counted period and the magnetic force detected by the magnetic force detection unit 3, The position can be detected with higher accuracy.

  In particular, as in the present embodiment, when the drive device according to the present invention is applied to an imaging device, an imaging device capable of driving the optical lens 4c with higher accuracy using fewer magnetic force detection means is provided. it can.

  In the above-described embodiment, the imaging device in which the magnetic field generating member 1 is tilted and fixed so that the relative distance from the magnetic force detection unit 3 becomes shorter as the movable unit 4 moves away from the imaging surface of the image sensor 20 has been described. However, it is not limited to such a configuration, and the magnetic field generating member 1 is inclined and fixed so that the relative distance to the magnetic force detection unit 3 becomes longer as the movable unit 4 moves away from the imaging surface of the image sensor 20. It may be a configuration.

  In the above-described embodiment, the configuration in which the auxiliary shaft 6 is provided in addition to the drive shaft 7 has been described. However, the configuration is not limited thereto, and the configuration in which the auxiliary shaft 6 is omitted may be used. Further, the magnetic force detection unit 3 and the optical lens 4c are not limited to the configuration directly attached to the movable unit 4, but may be configured to be connected to the movable unit 4 through other members.

  In the above embodiment, the configuration in which the magnetic force detection unit 3 is slidably held by the movable unit 4 has been described. However, the configuration is not limited to such a configuration, and the magnetic force detection unit 3 is fixed and the magnetic field generation member 1 is the N pole. It may be configured to be slidably held on a straight line intersecting in the same plane with respect to the arrangement direction Z of the 1a and S poles 1b.

It is the perspective view which showed an example of the drive device by embodiment of this invention. It is a figure for demonstrating the magnetic flux line of the magnetic field which generate | occur | produces from a magnetic field generation member. It is a figure for demonstrating the intensity | strength of the magnetic field generate | occur | produced from a magnetic field generation member. It is a figure for demonstrating the change of the voltage output value output from a magnetic force detection part. It is the perspective view which showed an example of the imaging device to which the drive device of FIG. 1 was applied. It is a front view of the imaging device shown in FIG. FIG. 6 is a block diagram illustrating an example of an electrical configuration in the imaging apparatus of FIG. 5. It is the functional block diagram which showed the example of 1 structure of the microcomputer. It is the flowchart which showed an example of the process which a microcomputer performs when sliding a movable part. FIG. 10 is a flowchart showing an example of processing performed by the microcomputer when the movable part is slid, and shows a continuation of FIG. 9.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnetic field generating member 1a N pole 1b S pole 3 Magnetic force detection part 4 Movable part 4c Optical lens 7 Drive part 12 Microcomputer 13 Drive pulse control part 14 Memory 20 Image sensor 121 Extreme value detection part 122 Amplitude calculation part 123 Slide direction detection part 124 Position detection unit 125 Period counting unit W1, W2 Amplitude X, Y Slide direction Z Array direction

Claims (3)

Magnetic field generating means in which N poles and S poles are alternately arranged on a straight line;
Magnetic force detection means for detecting the magnetic force generated from the magnetic field generation means;
Holding means for holding the magnetic field generating means or the magnetic force detecting means, and being slidable on a straight line intersecting in the same plane with respect to the arrangement direction of the north and south poles;
An amplitude calculating means for calculating the amplitude of the magnetic force based on the maximum value and the minimum value of the magnetic force detected by the magnetic force detection means when the holding means is sliding;
A sliding direction detecting means for detecting a sliding direction of the holding means based on a change in amplitude calculated by the amplitude calculating means;
A drive device comprising: drive means for sliding the holding means based on the detection result of the slide direction detection means. A period counting means for counting the period of the magnetic force detected by the magnetic force detection means when the holding means is sliding;
A position detecting means for detecting the position of the holding means based on the period counted by the period counting means and the magnetic force detected by the magnetic force detecting means,
2. The driving apparatus according to claim 1, wherein the driving unit slides the holding unit based on detection results of the sliding direction detection unit and the position detection unit. The driving device according to claim 1 or 2,
An optical lens held by the holding means such that an optical axis is parallel to the sliding direction;
An image pickup apparatus comprising: an image pickup unit having an image pickup surface orthogonal to the slide direction on an optical axis of the optical lens.

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