JP2016184132A - Optical driving device and optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately set a distance between a position detection element and a magnet, regardless of a thickness of a coil.SOLUTION: An optical driving device includes: a base member 31; a movable member 30 which holds an optical element L2 and moves in a first direction; a magnet 36 attached to a first member of the base member and the movable member; a coil 37 attached to a second member to face the magnet in a second direction orthogonal to the first direction; a position detection element 43 attached to the second member to detect a position of the movable member in the first direction; and a flexible substrate 38 including a wiring section 38w attached to the second member so as to be positioned opposite the magnet with respect to the coil, and a detection element connection section 38a extended from the wiring section and electrically connected to the position detection element. The position detection element and the detection element connection section of the flexible substrate are arranged inside an air core part S of the coil and inside both ends of the coil in the second direction.SELECTED DRAWING: Figure 8

Description

  The present invention relates to an optical drive device for performing optical image stabilization and other operations by moving an optical element and an imaging element in an optical apparatus such as a camera or an interchangeable lens.

  The optical drive device includes, for example, a magnet that can move integrally with the optical element or the image pickup device, and a coil that is fixed to the base member of the device and faces the magnet. ) Is often used. In such an optical driving device, a position detection element such as a Hall element that outputs a signal corresponding to a change in the magnetic field (the same magnetic field) is used for detecting the movement position of the optical element or the imaging element.

  Patent Document 1 discloses an optical drive device (optical vibration isolation device) in which a Hall element is arranged inside an air core portion of a coil provided on a base member. In this apparatus, the Hall element is mounted on a flexible substrate, and the entire flexible substrate (the portion on which the Hall element is mounted and the surrounding wiring portion) is disposed between the base member and the coil, so that The element is arranged inside the air core part of the coil.

JP 2010-008982 A

  In the optical driving apparatus as described above, as a method for increasing the driving force generated by the voice coil motor, there is a method of increasing the thickness of the coil (the dimension in the optical axis direction in Patent Document 1). However, in the configuration as in Patent Document 1, the Hall element is located at the position farthest from the magnet inside the air core portion of the coil, that is, at the position along the end surface of the coil opposite to the end surface on the magnet side. Can only be placed. For this reason, the distance between the Hall element and the magnet is increased by increasing the thickness of the coil, the linearity of the output signal of the Hall element is deteriorated, the position detection accuracy is lowered, and the high-precision position of the optical element or the imaging element is reduced. There is a risk that control cannot be performed (good vibration isolation performance cannot be obtained).

  The present invention provides an optical driving apparatus and an optical apparatus using the same, which can appropriately set the distance between a position detection element such as a Hall element and a magnet even when the thickness of the coil increases.

  An optical driving device according to one aspect of the present invention includes a base member, a movable member that holds the optical element or the imaging element and is movable in the first direction with respect to the base member, and one of the base member and the movable member. The magnet attached to the first member and the second member, which is the other of the base member and the movable member, are opposed to the magnet in a second direction orthogonal to the first direction. A coil that is attached and energized to generate an electromagnetic force acting in the first direction with the magnet, and a position that is attached to the second member and detects the position of the movable member in the first direction. A detection element, a wiring portion attached to the second member so as to be located on the opposite side of the magnet from the coil, and a detection element connection extending from the wiring portion and electrically connected to the position detection element And a flexible substrate including a part. The coil has an air core part, and the position detection element and the detection element connection part of the flexible substrate are arranged inside the air core part and inside the both ends of the coil in the second direction. It is characterized by.

  Note that an optical apparatus using the optical driving device also constitutes another aspect of the present invention.

  According to the optical drive device of the present invention, the detection element connecting portion of the flexible substrate can be extended to the inside of the air core portion of the coil in which the position detection element is arranged. For this reason, even if the thickness of the coil (dimension in the second direction) increases, the position of the position detection element in the second direction, that is, the distance between the position detection element and the magnet is appropriately set. be able to. Therefore, it is possible to increase the driving force for moving the movable member while preventing a decrease in detection accuracy of the position of the movable member. By using this optical drive device, it is possible to perform highly accurate position control of the optical element or the image pickup element held by the movable member (for example, it is possible to obtain good vibration isolation performance). Equipment can be realized.

Sectional drawing which shows the structure of the vibration isolator which is Example 1 of this invention. FIG. 3 is a cross-sectional view of an interchangeable lens including the image stabilization unit of Embodiment 1 in a wide angle end state. FIG. 3 is a cross-sectional view of the interchangeable lens of Example 1 in a telephoto end state. FIG. 3 is an exploded perspective view of the vibration isolation unit according to the first embodiment. FIG. 2 is a block diagram showing an electrical configuration of an interchangeable lens of Example 1 and a camera body to which the interchangeable lens is attached. Sectional drawing at the time of the vibration proof operation of the vibration proof unit of Example 1. FIG. FIG. 3 is a perspective view illustrating a shift holding frame of the vibration isolation unit according to the first embodiment. FIG. 3 is an enlarged cross-sectional view of the vibration isolating unit according to the first embodiment. FIG. 3 is a development view of a flexible substrate in the vibration proof unit of the first embodiment. The other expanded view of the said flexible substrate. Sectional drawing which shows the position adjustment mechanism in the vibration isolator which is Example 2 of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  2 and 3 show a configuration of an interchangeable lens 200 as an optical apparatus including an image stabilization unit (optical image stabilization device) as an optical drive device that is Embodiment 1 of the present invention. FIG. 2 shows the retracted (retracted) state of the interchangeable lens 200, and FIG. 3 shows the telephoto end state of the interchangeable lens 200. In these drawings, AXL is the optical axis of the photographing optical system housed in the interchangeable lens 200. The direction in which the optical axis AXL extends is called the optical axis direction.

  L1 is a first group lens, and 1 is a first group holding frame that holds the first group lens L1. Reference numeral 6 denotes a first group barrel to which the first group holding frame 1 is fixed. L2 is a shift lens (second group lens) as an optical element (movable element), and 30 is a shift holding frame as a movable member that holds the shift lens L2. The shift holding frame 30 is movable in a plane including a plurality of directions orthogonal to the optical axis AXL. By moving (shifting) the shift holding frame 30 holding the shift lens L2 within the plane, it is possible to perform optical image stabilization that reduces image blur due to camera shake.

  L3 is a third group lens, and 2 is a third group holding frame that holds the third group lens L3. L4 is a 4-group lens, and 3 is a 4-group holding frame that holds the 4-group lens L4. The fourth group holding frame 3 is fixed to the third group holding frame 2. L5 is a focus lens (5 group lens), and 13 is a focus holding frame for holding the focus lens L5. L6 is a 6-group lens, and 4 is a 6-group holding frame that holds the 6-group lens L6. The focus holding frame 13 is moved in the optical axis direction by a straight guide mechanism (not shown) and a driving mechanism provided in the third group holding frame 2 to perform a focus adjustment operation.

  L7 is a 7-group lens, and 5 is a mount for holding the 7-group lens and mounting the interchangeable lens 200 to the camera body 500. A diaphragm unit 7 adjusts the amount of light by changing the size of a diaphragm aperture formed by diaphragm blades (not shown). The aperture unit 7 is fixed to the third group holding frame 2. The first to seventh lens groups L1 to L7 and the diaphragm unit 7 constitute a photographing optical system. Each group lens may be constituted by a single lens or a plurality of lenses.

  Reference numeral 9 denotes a movement guide tube. A cam ring 10 is arranged on the outer periphery of the movement guide cylinder 9 so as to be rotatable in a rotation direction (hereinafter referred to as a circumferential direction) about the optical axis AXL. Reference numeral 11 denotes a fixed cylinder that constitutes the main body of the interchangeable lens 200, and accommodates a photographing optical system and an image stabilization unit. A cam groove portion (not shown) is formed in the fixed cylinder 11, and a cam ring roller (not shown) provided on the cam ring 10 is engaged with the cam groove portion.

  Reference numeral 12 denotes a fixed guide cylinder, which is fixed to the fixed cylinder 11 with screws. The fixed guide tube 12 engages a straight groove formed on the outer peripheral surface of the fixed tube 11 with a convex portion (not shown) installed on the inner peripheral surface of the move guide tube 9, so that the moving guide tube 9 is lightened. Guide in the axial direction. The moving guide tube 9 is formed with a guide groove portion that guides the first group barrel 6 and the third group holding frame 2 straight in the optical axis direction in a zoom operation described later.

  Reference numeral 21 denotes a main printed circuit board on which a lens microcomputer and an IC for controlling each operation of the interchangeable lens 200 are mounted, and is fixed to the fixed cylinder 11 by three bushes 25.

  Reference numeral 16 denotes a manual focus (MF) ring unit. Reference numeral 14 denotes a manual zoom (ZF) ring unit. The MZ and MF ring units 14 and 16 are supported so as to be rotatable in the circumferential direction at fixed positions with respect to the fixed cylinder 11.

  Reference numeral 19 denotes an exterior ring. The exterior ring 19 is sandwiched between the fixed cylinder 11 and the mount 5 and fixed with screws. When the MF ring unit 16 rotates, the amount of rotation is detected by a sensor (not shown), and a focus actuator (not shown) is driven according to the detected amount of rotation, so that the focus holding frame 13 and the focus lens L5 are light. Move in the axial direction.

  Reference numeral 15 denotes a contact block, which is connected to the main printed circuit board 21 by wiring (not shown) (flexible board or the like) and fixed to the mount 5 with screws.

  The interchangeable lens 200 of the present embodiment is detachably attached to the camera body 500 by bayonet coupling at the mount 5. Accordingly, the lens microcomputer on the main printed circuit board 21 can communicate with the camera body 500 through the contact block 15. Reference numeral 600 denotes an image sensor mounted on the camera body 500, which is a photoelectric conversion element such as a CMOS sensor or a CCD sensor that converts a subject image formed by the photographing optical system into an electric signal.

  The zoom operation will be described. The MZ ring unit 14 is connected to the cam ring 10 via a roller (not shown) provided on the outer peripheral surface of the cam ring 10, and when the MZ ring unit 14 is rotated in the circumferential direction by the user, the cam ring 10 is also Rotate in the circumferential direction. A roller (not shown) provided in the first group barrel 6 to which the first group holding frame 1 is fixed is engaged with a first group cam groove (not shown) formed in the cam ring 10. For this reason, the first group lens barrel 6 (first group lens L1) advances and retreats in the optical axis direction as the cam ring 10 rotates in the circumferential direction.

  A roller (not shown) provided on the third group holding frame 2 is engaged with a third group cam groove formed in the cam ring 10. For this reason, the third group holding frame 2 together with the image stabilizing unit (shift lens L2 and shift holding frame 30), the diaphragm unit 7, the fourth group holding frame 3, the focus holding frame 13 and the sixth group holding frame 4 fixed thereto. As the cam ring 10 rotates in the circumferential direction, it advances and retreats in the optical axis direction.

  The interchangeable lens 200 of the present embodiment has a collapsible structure that can be shortened in total length when not in use (when photographing), and the MZ ring unit 14 is rotated from the retracted state shown in FIG. Thus, the entire length of the interchangeable lens 200 is extended to a wide angle end state (not shown). By further rotating the MZ ring unit 14 from the wide-angle end state, the entire length of the interchangeable lens 200 is further extended to the telephoto end state shown in FIG.

  The rotation of the MZ ring unit 14 is detected by the above-described sensor, and the lens microcomputer on the main printed circuit board 21 determines the zoom position based on the output signal, and the focus control, anti-vibration control, and aperture according to the zoom position. Take control.

  The electrical configuration of the camera system including the interchangeable lens 200 and the camera body 500 will be described with reference to FIG. In the camera body 500, reference numeral 501 denotes a camera CPU constituted by a microcomputer. The camera CPU 501 controls the operation of each unit in the camera body 500. The camera CPU 501 communicates with the lens CPU 201 which is the above-described lens microcomputer provided in the interchangeable lens 200 via the electrical contacts 102 and 202. Information (signals) transmitted from the camera CPU 501 to the lens CPU 201 includes information on the aperture value and focus drive amount, information on parallel shake detected in the camera body 500, and information on focus shake. The information (signal) transmitted from the lens CPU 201 to the camera CPU 501 includes imaging magnification information. The electrical contacts 102 and 202 include a power contact for supplying power from the camera body 500 to the interchangeable lens 200.

  Reference numeral 503 denotes a power switch that can be operated by the user. Reference numeral 504 denotes a release switch that can be operated by the user, and includes a first stroke switch SW1 for instructing the start of a shooting preparation operation and a second stroke switch SW2 for instructing a shooting and recording operation.

  The camera CPU 501 causes the photometry unit 505 to measure the subject brightness and the focus detection unit 506 to detect the focus state of the photographing optical system as a shooting preparation operation. The camera CPU 501 calculates the aperture value of the aperture unit 7, the exposure amount of the image sensor 600 (in shutter seconds), and the like based on the photometric result. In addition, the camera CPU 501 determines a drive amount (focus drive amount) of the focus lens L5 for obtaining a focused state with respect to the subject based on a defocus amount that is a detection result of the focus state of the photographing optical system by the focus detection unit 506. calculate. The camera CPU 501 transmits information on the aperture value and the focus drive amount to the lens CPU 201, and the lens CPU 201 controls the aperture unit 7 and the focus actuator based on the received information.

  Further, when the camera CPU 501 enters a predetermined shooting mode, the camera CPU 501 starts shift driving of the shift lens L2 (shift holding frame 30) in the image stabilization unit, that is, control of the image stabilization operation.

  Further, the camera CPU 501 transmits an exposure start command to the exposure unit 507 as a photographing recording operation, and causes the quick return mirror (not shown) to be retracted from the optical path and the shutter (not shown) to be opened. Further, the image capturing unit 508 including the image sensor 600 is caused to perform a photoelectric conversion operation of the subject image, that is, an exposure operation.

  An imaging signal from the imaging unit 508 (imaging device 600) is digitally converted by a signal processing unit in the camera CPU 501 and further various processes are performed on the digital imaging signal to generate an image signal (image data). Image data is recorded and stored in a recording medium such as a semiconductor memory such as a flash memory, a magnetic disk, and an optical disk by an image recording unit 509.

  In the interchangeable lens 200, reference numeral 204 denotes an MF ring unit rotation detection unit, which includes the MF ring unit 16 and its rotation detection unit.

  Reference numeral 205 denotes an MZ ring unit rotation detector, which includes a sensor (not shown) that detects the rotation of the MZ ring unit 14.

  Reference numeral 206 denotes an IS drive unit, which includes a pitch shift actuator and a yaw shift actuator that perform shift driving in the pitch direction and the yaw direction of the shift holding frame 30, and a drive circuit thereof.

  Reference numeral 209 denotes an AF drive unit that drives the focus actuator in accordance with a focus drive command from the lens CPU 201 that has received information on the focus drive amount from the camera CPU 501 to move the focus lens L5 in the optical axis direction. Thereby, AF is performed.

  Reference numeral 208 denotes an electromagnetic aperture driving unit that drives the aperture unit 7 in response to an aperture driving command from the lens CPU 201 that receives aperture value information from the camera CPU 501. Thereby, the aperture opening corresponding to the aperture value information is set.

  Reference numeral 211 denotes an angular velocity sensor as a shake detector mounted on the interchangeable lens 200 and connected to the main printed circuit board 21. The angular velocity sensor 211 outputs to the lens CPU 201 angular velocity signals indicating the angular velocities of the interchangeable lens 200, that is, the vertical (pitch direction) shake and the lateral (yaw direction) shake, which are the angular shakes of the camera system. The lens CPU 201 integrates the angular velocity signals in the pitch direction and the yaw direction from the angular velocity sensor 211, and the pitch direction shake amount and the yaw direction shake amount (hereinafter, these are collectively referred to as the angular shake amount). (Also called). Then, the lens CPU 201 controls the IS drive unit 206 based on the combined displacement amount of the above-described angular shake amount and the parallel shake amount transmitted from the camera CPU 501 to shift-drive the shift lens L2, thereby performing the angular shake correction and the parallel shake. Make corrections.

  Further, the lens CPU 201 controls the AF driving unit 209 based on the amount of focus shake transmitted from the camera CPU 501 and drives the focus lens L5 in the optical axis direction to perform focus shake correction.

  Next, the image stabilization unit in the present embodiment will be described with reference to FIGS. 4, 6, and 7. 4 includes a shift base (second member) 31, a shift lens L2, a shift holding frame (first member) 30 that holds the shift lens L2, and a pitch included in the IS drive unit 206 illustrated in FIG. 2 shows an exploded view of a vibration isolation unit including a yaw shift actuator. 4 also shows the third group barrel 2, the aperture unit 7, and the focus actuator 45 included in the AF drive unit 209. FIG. 6 shows the image stabilization unit, the third group barrel 2, the focus actuator 45, and the like as viewed from the optical axis direction. FIG. 7 shows the shift holding frame 30 after assembly in the vibration isolating unit.

  A magnet set composed of a magnet 36 as a permanent magnet and a yoke (see 44 in FIG. 1) is attached to each of two positions of the shift holding frame 30 that are 90 ° out of phase with each other in the circumferential direction. Reference numeral 31 denotes a shift base as a base member, and 34 denotes three balls arranged between the shift base 31 and the shift holding frame 30 in the optical axis direction (second direction). Reference numeral 35 denotes two coil springs that generate an urging force that presses the shift holding frame 30 with the three balls 34 interposed between the shift base 31 and the shift base 31. The shift holding frame 30 is pressed against the shift base 31 via the three balls 34 by this urging force, whereby the shift holding frame 30 is positioned with respect to the shift base 31 in the optical axis direction. The shift holding frame 30 is a surface that includes a pitch and a yaw direction (first direction) orthogonal to the optical axis AXL and orthogonal to each other while rolling the three balls 34 relative to the shift base 31. Can be shifted with respect to the optical axis AXL.

  On the other hand, as shown in FIG. 7, a coil 37 is attached to each of two locations on the shift base 31 that are 90 ° out of phase with each other in the circumferential direction. Each of these two coils 37 is disposed so as to face the corresponding magnet 36 of the two magnet sets in the optical axis direction. A drive signal (current) from the lens CPU 201 is supplied to each coil 37 via a shift FPC 38 which is a flexible substrate attached to the shift base 31. When one of the two coils 37 is energized, an electromagnetic force acting in the pitch direction is generated between the coil 37 and the corresponding magnet 36. The other coil 37 is energized to generate an electromagnetic force acting in the yaw direction with the magnet 36 corresponding thereto.

  The shift base 31 is fixed to the third group holding frame 2 by three screws 41 and incorporated into the third group holding frame 2. At this time, the shift FPC 38 is fixed to the shift base 31 together with the FPC fixing sheet metal 42 by one of the three screws 41.

  33 is a gel-like viscoelastic member. 31 a is an outflow prevention wall provided on the shift base 31 for storing the viscoelastic member 33. Reference numeral 32 denotes a protrusion provided on the shift holding frame 30. As shown in FIG. 2 and FIG. 3, the protrusion 32 is inserted into the viscoelastic member 33 stored inside the outflow prevention wall 31 a by incorporating the shift holding frame 30 into the shift base 31. Thereby, the viscoelastic member 33 becomes a damper when driving the shift holding frame 30.

  Reference numeral 39 denotes a shift base mask, which is attached to the front surface (subject side surface) of the shift base 31 so as to cover the shift FPC 38 and the FPC fixing sheet metal 42. Reference numeral 40 denotes a shift movable mask, which is attached to the front surface of the shift holding frame 30. These masks 39 and 40 are blindfolds for preventing the user from visually recognizing the internal structure of the image stabilizing unit through the first lens group L1, and the viscoelastic member 33 having a damper effect is altered by light from the outside. It also has a role to prevent vibrations.

  A diaphragm unit 7 is fixed on the opposite side (image side) of the third group holding frame 2 with respect to the image stabilizing unit and the third group lens L3. A focus actuator 45 is disposed on the side surfaces of the third group holding frame 2 and the aperture unit 7.

  FIG. 1 shows a pitch shift actuator (magnet 36, yoke 44, and coil 37) that shift-drives the shift holding frame 30 in the pitch direction of the vibration isolation unit. Note that the configuration of the yaw shift actuator that shift-drives the shift holding frame 30 in the yaw direction in the image stabilization unit is the same as the configuration of the pitch shift actuator, and thus the description thereof is omitted. FIG. 1 also shows the third group lens barrel 2 to which the image stabilization unit is fixed and the aperture unit 7 fixed to the third group lens barrel 2. A diaphragm motor 7 a drives the diaphragm blades in the diaphragm unit 7.

  The magnet 36 is fixed to the shift holding frame 30 by being attracted to the yoke 44 fixed to the shift holding frame 30 by a magnetic force. The coil 37 is fixed to the shift base 31 on the opposite side of the yoke 44 with the magnet 36 interposed therebetween and so as to face the magnet 36 with a predetermined interval.

  The coil 37 is formed in a rectangular frame shape having an air core portion (hereinafter referred to as a coil air core portion) S, and is configured by winding a conductive wire around the coil air core portion S many times. When the direction perpendicular to the direction in which the conductive wire is wound is referred to as the winding axis direction, the coil 37 is fixed to the shift base 31 so that the winding axis direction is parallel to the optical axis direction.

  Reference numeral 43 denotes a Hall element as a position detection element disposed in the coil air core S. When a current flows through the coil 37, a Lorentz force is generated as a driving force for shifting the shift holding frame 30 by the action of the current and the magnetic flux from the magnet 36. The Hall element 43 detects a change in magnetic flux (dynamic magnetic field) at this time, and outputs a position detection signal (current) corresponding to the dynamic magnetic field. The lens CPU 201 shown in FIG. 5 detects the shift position in the pitch direction of the shift holding frame 30 (shift lens L2) using the position detection signal from the hall element 43, and the shift holding frame 30 is shifted to the target position. In this way, the amount of current supplied to the coil 37 is feedback-controlled.

  The yoke 44 has a role of rectifying the magnetic flux radiated from the magnet 36 so as to be radiated to the coil 37 side with higher density. The yoke 44 also has a role of preventing the magnetic flux from being radiated to the aperture unit 7 side.

  In the present embodiment, the magnet 36 and the aperture motor 7a are arranged in approximately the same phase in the circumferential direction. Therefore, by arranging the yoke 44 between the magnet 36 and the aperture motor 7a, magnetic interference between the magnet 36 and the magnet in the aperture motor 7a can be prevented or reduced, and the shift actuator and the aperture motor 7a can be prevented. It is possible to avoid performance degradation.

  Mechanical end portions 30 a are provided at a plurality of locations in the circumferential direction of the shift holding frame 30. On the other hand, the third group barrel 2 is provided with stoppers 2a at a plurality of positions on the outer peripheral side of the mechanical end 30a and ring-shaped stoppers 2b on the inner peripheral side of the mechanical end 30a. Yes. The shift holding frame 30 is driven to shift with respect to the shift base 31 between positions where the mechanical end 30a abuts against the stoppers 2a and 2b.

  As shown in FIG. 7, notches 30d are formed at two positions on the opposite sides of the shift holding frame 30 with the shift lens L2 interposed therebetween. When the shift holding frame 30 is driven to shift, the outflow prevention wall 31a enters the notch 30d, so that a large shift driving range of the shift holding frame 30 can be secured. However, the flange portion 30f is provided in a portion adjacent to the notch portion 30d in the shift holding member 30 in the optical axis direction so that the strength of the shift holding frame 30 is not insufficient by providing the notch portion 30d in the shift holding member 30. Provided. The flange portion 30f is provided with the above-described mechanical end portion 30a and a receiving surface 30e that receives the ball 34 in a rollable manner.

Next, the relationship among the Hall element 43, the shift FPC 38, and the coil 37 will be described with reference to FIGS. The hall element 43 is held by being press-fitted into the hall element press-fitting part 31 b located inside the coil air core part S of the shift base 31.
The shift FPC 38 includes a wiring portion 38 w that is disposed on the front surface of the shift base 31 (the surface opposite to the surface on which the coil 37 is attached) and is fixed to the shift base 31 together with the FPC fixing sheet metal 42. The shift FPC 38 has a hall element mounting part (detection element connection part) 38 a that extends from the wiring part 38 w and is connected to the hall element 43. The hall element mounting portion 38a extends from the wiring portion 38w through the shift base 31 in the optical axis direction to the inside of the coil air core portion S (hall element press-fit portion 31b), and is further disposed behind (on the magnet 36 side). Connected to the Hall element 43.

  Reference numeral 38b denotes a backing that is attached to the surface of the Hall element mounting portion 38a opposite to the Hall element 43. The FPC fixing sheet metal 42 has a pressing portion 42a as a pressing member that presses the backing 38b and the Hall element mounting portion 38a against the front end surface of the Hall element press-fitting portion 31b. The Hall element mounting portion 38a is pressed against the front end surface of the Hall element press-fitting portion 31b by the pressing portion 42a, so that the Hall element 43 is held at a predetermined position of the Hall element press-fit portion 31b (preventing movement in the optical axis direction). )

  In the present embodiment, both the Hall element 43 and the Hall element mounting portion 38a are arranged in a range W inside the coil air core portion S (Hall element press-fit portion 31b) and inside both ends of the coil 37 in the optical axis direction. Has been. That is, the Hall element 43 has an end surface (hereinafter referred to as a magnet side coil end surface) 37b facing the magnet 36 by a distance d from an end surface (hereinafter referred to as a holding frame side coil end surface) 37a of the coil 37 that contacts the shift holding frame 30. It is arranged in the middle position near. Furthermore, the Hall element mounting portion 38 a is also inserted inside the coil air core portion S and connected to the Hall element 43.

  However, as shown in FIG. 9, a plurality (four) of wiring patterns 38c to 38f are provided in parallel in the Hall element mounting portion 38a. Specifically, the wiring patterns 38c to 38f are patterns for supplying power to the Hall element 43 indicated by a dotted line in FIG. 9 and extracting an output signal. The wiring patterns 38 c to 38 f are exposed by removing the surface film in the region 38 g and are soldered to the four terminals of the Hall element 43. As a result, the lens CPU 201 can drive the Hall element 43 and capture an output signal from the Hall element 43 via the shift FPC 38 (Hall element mounting portion 38a and wiring portion 38w).

  The wiring patterns 38c and 38d are formed so as to bypass the wiring patterns 38e and 38f, and it is necessary to increase the width of the Hall element mounting portion 38a. In the present embodiment, both convex portions that are wider than other portions are provided in a part of the hall element mounting portion 38a in the longitudinal direction.

  On the other hand, the width of the coil air-core portion S of the coil 37 manufactured in a size close to the minimum necessary for downsizing the vibration-proof unit (internal method in the vertical direction in FIG. 9) is the hole It is smaller than the width of the element mounting portion 38a. Therefore, the Hall element mounting portion 38a as shown in FIG. 9 cannot be inserted inside the coil air core portion S.

  For this reason, in this embodiment, the hall element mounting portion 38a is folded at two “fold lines” in the width direction shown in FIG. 9 so as to wind the backing 38b as shown in FIG. Insert into part S. As shown in FIG. 7, the folded portion of the Hall element mounting portion 38 a is also pressed against the Hall element press-fitting portion 31 b by the pressing portion 42 a of the FPC fixing sheet metal 42.

  With such a configuration, even if the thickness (width W) of the coil 37 is increased in order to increase the driving force of the shift actuator, the Hall element 43 is arranged at the intermediate position inside the coil air core S. Can do. Therefore, by arranging the Hall element 43 at a position away from the magnet 36 inside the coil air core S, the linearity of the output signal of the Hall element 43 is deteriorated and the detection accuracy of the shift position is lowered, which is good. Occurrence of the problem that the vibration proof performance cannot be obtained can be avoided.

  The Hall element mounting portion 38a of the shift FPC 38 may be formed in a frame shape as shown in FIG. Reference numeral 38h denotes a hole formed in the center of the frame-shaped hall element mounting portion 38a. Of the four wiring patterns 38c to 38f, the two wiring patterns 38e and 38f extend directly from the wiring portion 38w and are connected to the hall element 43 from one longitudinal direction of the coil air core portion S. On the other hand, the other two wiring patterns 38c and 38d are connected to the hall element 43 from the other longitudinal direction of the coil air-core part S through the bypass part 38h of the hall element mounting part 38a from the wiring part 38w. . Then, the detour portion 38h is folded to the Hall element 43 side by one “fold line” indicated by a one-dot chain line in the drawing, and the backing 38b shown in FIG. 8 is wound, and the Hall element mounting portion 38a including the detour portion 38h is The FPC fixing sheet metal 42 is pressed by the pressing portion 42a. Thereby, the Hall element 43 can be disposed at the intermediate position inside the coil air core S.

  The Hall element mounting portion 38a of the shift FPC 38 may be disposed inside the coil air core portion S in a state of being folded at a right angle or the like instead of being folded as described above.

  FIG. 11 shows an arrangement structure of the Hall elements 43 in the image stabilization unit that is Embodiment 2 of the present invention. In the present embodiment, portions having functions (roles) common to the first embodiment are denoted by the same reference numerals as those in the first embodiment, and detailed description thereof is omitted.

  Also in the present embodiment, the Hall element 43 is disposed inside the coil air-core portion S (Hall element press-fit portion 31b) in the same manner as in the first embodiment. However, in the present embodiment, a spacer 48 as a position changing means is disposed between the Hall element press-fitting portion 31b and the shift FPC 38. Then, by changing the thickness of the spacer 48, the position of the hall element 43 in the coil air-core portion S in the optical axis direction can be adjusted (changed) as indicated by an arrow in the drawing. Thus, even when the Hall element 43 has a variation in sensitivity due to individual differences, the position of the Hall element 43 can be adjusted so that the distance between the Hall element 43 and the magnet 36 is optimal.

  The material and shape of the spacer 48 are not particularly limited. For example, a washer may be used as the spacer 48.

  In each of the embodiments described above, the case where a flexible substrate having a wiring pattern formed on one side is used as the shift FPC 38, but a double-sided flexible substrate having a wiring pattern formed on both sides may be used.

  In each of the above embodiments, the case where the coil 37 is attached to the shift base 31 and the magnet 36 is attached to the shift holding frame 30 has been described. Alternatively, the magnet is attached to the shift base (first member) and the shift holding frame (first A coil may be attached to the second member.

  Further, in each of the above-described embodiments, the case where the configuration in which the Hall element 43 is disposed inside the coil air core portion S in the image stabilization unit that performs optical image stabilization by shifting the shift lens (optical element) L2 has been described. However, instead of the shift lens L2, a configuration in which the hall element 43 is disposed inside the coil air-core portion S in an image stabilization unit that performs optical image stabilization by shifting the image sensor (shift element) 600 may be used.

  Further, the embodiments described above are not limited to the image stabilization unit, but are described in the above embodiments for the optical drive device that performs an optical function other than the image stabilization by moving the optical element or the image sensor in the direction orthogonal to the optical axis direction or the optical axis direction. A configuration related to the Hall element may be applied. Optical functions other than anti-vibration include a function that assists so-called panning by shifting the optical element or image sensor in a direction perpendicular to the optical axis direction, and focusing by moving the optical element or image sensor in the optical axis direction. There is a function to perform.

  In each of the above embodiments, the interchangeable lens provided with the image stabilization unit has been described. However, the present invention relates to the Hall element described in each of the above embodiments in an optical driving device mounted on various optical devices such as a lens-integrated camera and binoculars. A configuration may be applied. Furthermore, a position detection element other than the Hall element, for example, an MR element may be used.

  Each embodiment described above is only a representative example, and various modifications and changes can be made to each embodiment in carrying out the present invention.

L2 Shift lens 30 Shift holding frame 31 Shift base 36 Magnet 37 Coil 38 Shift FPC
38a Hall element connection part 38w Wiring part

Claims (8)

A base member;
A movable member that holds an optical element or an imaging element and is movable in a first direction with respect to the base member;
A magnet attached to a first member that is one of the base member and the movable member;
The magnet is attached to a second member which is the other of the base member and the movable member so as to face the magnet in a second direction orthogonal to the first direction, and is energized. A coil for generating an electromagnetic force acting in the first direction between
A position detection element attached to the second member and detecting a position of the movable member in the first direction;
A wiring portion attached to the second member so as to be positioned on the opposite side of the magnet with respect to the coil, and a detection element connecting portion extending from the wiring portion and electrically connected to the position detection element A flexible substrate including
The coil has an air core;
The optical device, wherein the position detecting element and the detecting element connecting portion of the flexible substrate are arranged inside the air core portion and inside the both ends of the coil in the second direction. Drive device. The wiring portion of the flexible substrate is attached to a surface of the second member opposite to the surface to which the coil is attached,
2. The optical drive device according to claim 1, wherein the detection element connecting portion extends from the wiring portion to the inside of the air core portion of the coil through the second member.   3. The optical driving device according to claim 1, wherein the detection element connection portion of the flexible substrate is disposed inside the air core portion in a folded state or a folded state. 4.   The holding member for holding the detection element connecting portion and the position detection element of the flexible substrate at a predetermined position in the second direction inside the air core portion of the coil. Item 4. The optical drive device according to any one of Items 1 to 3.   5. The apparatus according to claim 1, further comprising a position changing unit configured to change a position of the position detection element in the second direction inside the air core portion of the coil. Optical drive device.   The optical driving apparatus according to claim 1, wherein the position detection element is a Hall element.   7. The optical driving apparatus according to claim 1, wherein optical image stabilization for reducing image blur is performed by moving the optical element or the imaging element. 8. An optical driving device according to any one of claims 1 to 7,
An optical apparatus comprising: a main body that accommodates the optical driving device.