JP4655701B2 - Position detection device, blur correction device, and lens barrel - Google Patents

Description

The present invention relates to a position detection device that detects a displacement of a predetermined object, and a shake correction device and a lens barrel that include such a position detection device.

A shake correction apparatus used in a camera photographing optical system or the like displaces a shake correction optical system included in a part of the optical system in a direction substantially orthogonal to the optical axis, thereby blurring a subject image on its imaging plane. (Image blur) is reduced.
The shake correction device generally corrects the vertical shake (pitching) and lateral shake (yawing) of the camera during normal shooting. In this case, the shake correction optical system corresponds to the shake in each direction. , And move in parallel in two orthogonal directions.

The shake correction device is required to accurately detect the position of the shake correction optical system in order to ensure the correction accuracy.
Conventionally, it is known that a shake correction device uses a position detection device using a magnetic detection element such as a Hall element in order to detect the position of a shake correction optical system (for example, Patent Document 1).
Such a position detection device includes a magnetic detection element and a magnet, one of which moves following the blur correction optical system, and the other is fixed to the lens barrel side. Position detection is performed based on a change in magnetic field intensity detected by the magnetic detection element when moving.

The above-described position detection device usually detects the position of the magnet in the magnetization direction (N pole and S pole arrangement direction) with respect to the magnetic detection element. In order to move, the magnetic detection element and the magnet of the position detection device move relative to each other in a direction different from the original detection direction.
Since the magnetic field intensity detected by the magnetic detection element changes even when the magnetic detection element and the magnet move relative to each other in a direction perpendicular to the magnetization direction of the magnet, the position detection device has a position in the original detection direction. An error occurs in detection.
JP 2002-229090 A

An object of the present invention is to provide a position detection device with reduced detection error, and a blur correction device and a lens barrel that include such a position detection device.

  The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to the Example of this invention is attached | subjected and demonstrated, it is not limited to this.

In the first aspect of the present invention, a plurality of N poles (121, 122) are provided on one end side along the first direction so as to be spaced apart from each other in a second direction substantially orthogonal to the first direction . A plurality of S poles spaced apart in the second direction are provided on the other end side along the direction, and between the plurality of N poles (121, 122) and between the plurality of S poles , A relative movement part (120) provided with a non-magnetized region extending in a first direction, and the relative movement part movable relative to the relative movement part (120) in the first direction and the second direction. (120) and a magnetic detection unit (110) that detects the magnetism of the N pole (121, 122) and the S pole, and includes the relative movement unit (120) and the magnetic detection unit ( position detecting device characterized that you detect the relative position of said first direction and 110) (100 It is.

According to a second aspect of the present invention, a plurality of N poles (121, 122) are provided on one end side along the first direction so as to be spaced apart from each other in a second direction substantially orthogonal to the first direction. A plurality of S poles spaced apart in the second direction are provided on the other end side along the direction, and between the plurality of N poles (121, 122) and between the plurality of S poles, A relative movement part (120) provided with a plurality of N poles (121, 122) and a low magnetization region (300) having a magnetic flux density lower than that of the plurality of S poles, and the relative movement part (120) A magnetic detection unit (110) provided to face the relative movement unit (120) so as to be relatively movable in the first direction and the second direction, and detects the magnetism of the N poles (121, 122) and the S poles. The first way of the relative movement part (120) and the magnetic detection part (110) A position detecting device which is characterized that you detect the relative position (300).

According to a third aspect of the present invention, an N pole (121, 122) is provided on one end side along the first direction, an S pole is provided on the other end side along the first direction, and the N pole ( 121, 122) and the S magnetic detector of the pole (110) parallel to the first direction to the surface facing the recess (420) is provided relative movement section (420), the relative movement unit (420 ) To be opposed to the relative movement part (420) so as to be relatively movable in the first direction and a second direction substantially orthogonal to the first direction, and the N pole (121, 122) and the S and a said magnetic detector for detecting a pole of the magnetic (110), a position and detecting the relative position of said first direction of said magnetic detection unit and the relative moving section (420) (110) A detection device (400).

According to a fourth aspect of the present invention, there is provided a shake correction optical system (2) and a shake correction optical system (2) that supports the shake correction optical system (2) so as to be movable along a plane orthogonal to the optical axis. ) A support unit, a drive unit (4, 5) for driving the blur correction optical system (2) in a direction substantially orthogonal to the optical axis with respect to the blur correction optical system (2) support unit, and the blur correction The magnetic detection unit (110) fixed to one of the optical system (2) and the blur correction optical system (2) support unit and the relative movement unit (120) fixed to the other of the optical system (2). It is a blurring correction apparatus provided with the position detection apparatus (100) of any one of these.
The invention according to claim 5 is provided at one end side along the first direction, and generates a first magnetism in a second direction intersecting the first direction, and a first magnetism generating section that generates magnetism. Provided on the one end side with a gap between the first magnetic generation unit and a second magnetic generation unit for generating magnetism having the same polarity as the first magnetic generation unit, and provided on the other end side along the first direction. A third magnetism generating unit for generating magnetism of a polarity different from that of the first magnetism generating unit; and provided on the other end side at a distance from the third magnetism generating unit in the second direction. A first magnetism generating unit, which is provided between the first magnetism generating unit and the second magnetism generating unit; And a first low magnetic part for generating magnetism lower than the second magnetic generation part, and the third magnetic generation part and the front A second low magnetic unit that is provided between the fourth magnetic generation unit and generates a lower magnetism than the third magnetic generation unit and the fourth magnetic generation unit; and the first magnetic generation unit, The second magnetic generation unit, the third magnetic generation unit, and the fourth magnetic generation unit are relatively movable in the first direction and the second direction, and the first magnetic generation unit, 2 magnetic generation units, a magnetic detection unit (110) for detecting the magnetism generated from the third magnetic generation unit and the fourth magnetic generation unit, the magnetic detection unit (110) and the first magnetic generation unit Detecting a relative position in the first direction with respect to the first magnetic generation unit, the second magnetic generation unit, the third magnetic generation unit, and the fourth magnetic generation unit. ).
According to a sixth aspect of the present invention, in the position detection device (100) according to the fifth aspect, the magnetic detection unit (110) is opposed to the first low magnetic unit and the second low magnetic unit. The first magnetic generation unit is movable relative to the first magnetic generation unit, the second magnetic generation unit, the third magnetic generation unit, and the fourth magnetic generation unit along a first direction. And the second magnetic generation unit, the third magnetic generation unit, and the fourth magnetic generation unit move relative to the magnetic detection unit (110) along the first direction. The position detection device (100) is arranged such that the magnetism detected by the unit (110) changes with a predetermined output characteristic with respect to the relative movement amount in the first direction.
According to a seventh aspect of the present invention, in the position detection device (100) according to the fifth or sixth aspect, the first low magnetic part and the second low magnetic part are arranged in the second direction. The magnetic detection unit (110) when the magnetic generation unit, the second magnetic generation unit, the third magnetic generation unit, and the fourth magnetic generation unit and the magnetic detection unit (110) move relative to each other. It is arrange | positioned so that the said magnetic position detection error detected by 1 may be suppressed, It is a position detection apparatus (100) characterized by the above-mentioned.
According to an eighth aspect of the present invention, there is provided a shake correction apparatus including the position detection device (100) according to any one of the fifth to seventh aspects.
According to a ninth aspect of the present invention, there is provided a lens barrel comprising the blur correction device according to the fourth or eighth aspect.
According to a tenth aspect of the present invention, there is provided an XY plane including a blur correction optical system (2) and the blur correction optical system (2), which includes an X axis and a Y axis that are orthogonal to each other and orthogonal to each other. And a blur correction optical system (2) supporting portion that is movably supported along the XY plane, and driving the blur correction optical system (2) along the XY plane with respect to the blur correction optical system (2) support portion. a driving unit for the (4,5), claims 1 to 3, and a first and second position detecting device according to any one of claims 5 7 (100), the first position detection device (100), the first hand direction is up direction der along the X axis, the second position detecting device (100), the first hand direction is along the Y-axis direction This is a shake correction device that is in the direction of the movement.

According to the present invention, it is possible to reduce the output change of the magnetic detection unit when the relative movement unit moves in the non-detection direction with respect to the magnetic detection unit, and to reduce the position detection error in the original detection direction. it can.

In this embodiment , the problem of providing a position detection device or the like with reduced detection errors is obtained by providing magnetized regions each having N and S poles arranged in a detection direction on a magnet that translates relative to a Hall element. The problem is solved by providing a plurality in a non-detection direction perpendicular to the detection direction and disposing a non-magnetized region in the interval.

Hereinafter, the present invention will be described in more detail with reference to the drawings and the like.
FIG. 1 is a schematic diagram showing a configuration of a shake correction apparatus having a position detection apparatus according to a first embodiment to which the present invention is applied, and shows a state of the shake correction apparatus viewed from the optical axis direction.
1A shows a state in which the optical axis of the blur correction optical system is coincident with the optical axis I of the lens barrel, and FIG. 1B shows that the blur correction optical system is different from other optical systems. It is a figure which shows the state shifted downward. (Note that unless otherwise specified, “optical axis I” refers to the optical axis of a lens group other than the blur correction lens group included in the lens barrel.)

  The shake correction apparatus 1 includes a shake correction lens group 2, a movable lens frame 3, an X direction actuator 4, a Y direction actuator 5, an X direction position detection device 100, and a Y direction position detection device 200. .

The shake correction apparatus 1 is provided in a lens barrel of a camera (not shown), for example, and drives the X direction actuator 4 and the Y direction actuator 5 based on vibration detected by a vibration gyro sensor (not shown) to Displacement reduces image blur on the imaging surface.
The blur correction lens group 2 is a lens group that constitutes a part of an imaging lens group (not shown) as a whole, and improves image blur on the imaging plane by moving in a direction orthogonal to the optical axis I. is there.
The movable lens frame 3 is a lens support frame to which the blur correction lens group 2 is fixed on the inner diameter side thereof, and is along a plane orthogonal to the optical axis I with respect to the lens barrel by a movable lens group support mechanism (not shown). It is supported so that it can move.

Each of the X direction actuator 4 and the Y direction actuator 5 includes a voice coil motor, and drives the movable lens frame 3 in a corresponding direction.
The X direction and the Y direction refer to the moving direction of the blur correction lens 2 during blur correction for yawing and pitching during normal shooting, respectively. The X direction indicates the up and down direction during normal shooting. The horizontal direction shall be indicated.
The X-direction actuator 4 and the Y-direction actuator 5 are outer peripheral portions of the movable lens frame 3, respectively, along the horizontal direction with respect to the optical axis of the shake correction lens group 2, and the light of the shake correction lens group 2. The coil portion is fixed at a position below the shaft.

  The X direction position detection device 100 and the Y direction position detection device 200 detect the positions of the movable lens frame 3 in the X direction and the Y direction, respectively. It is arranged on the opposite side across the optical axis of the correction lens group 2.

The X direction position detection apparatus 100 and the Y direction position detection apparatus 200 include magnetic detection units 110 and 210 and magnets 120 and 220, respectively.
The magnetic detection units 110 and 210 include a magnetic field intensity sensor having a Hall element that is fixed to a lens barrel (not shown) of the lens barrel and generates an output voltage corresponding to the magnetic flux density of the detection unit. This magnetic field strength sensor detects a magnetic field in the normal direction of the surfaces of the magnets 120 and 220 facing the magnetic field strength sensor.
The magnets 120 and 220 are obtained by magnetizing (magnetizing) a magnetic material such as an iron-based metal, and are fixed to the outer periphery of the movable lens frame 3 to follow the displacement of the movable lens frame 3. Thus, it is a relative movement unit that moves relative to the corresponding magnetic detection units 110 and 210 along a plane orthogonal to the optical axis I.

  Since the X direction position detection device 100 and the Y direction position detection device 200 are arranged with their detection directions being substantially orthogonal, for example, as shown in FIG. When displaced in the direction, the magnet 120 of the X-direction position detection device 100 moves in the non-detection direction with respect to the magnetic detection unit 110.

FIG. 2 is an enlarged view of the X-direction position detection device 100. 2A is an enlarged view of a portion II in FIG. 1, and FIG. 2B is a view taken along the line bb in FIG. 2A. In FIG. 2A, the horizontal direction indicates the X direction that is the detection direction, and the vertical direction indicates the Y direction that is the non-detection direction.
As shown in FIG. 2A, the magnet 120 is formed in a rectangular shape in which the planar shape viewed from the optical axis I direction is arranged substantially parallel to the X direction and the Y direction, respectively. . In addition, as shown in FIG. 2B, the magnet 120 has a surface portion facing the magnetic detection portion 110 and a surface portion on the opposite side thereof formed in a substantially flat surface. The surface portion of the magnet 120 that faces the magnetic detection unit 110 is arranged in parallel with the X direction and the Y direction, respectively, so that when the magnet 120 moves following the movement of the movable lens frame 3, this and the magnetic detection are performed. The interval with the part 110 is substantially constant.

In the magnet 120, a pair of magnetization regions 121 and 122 each having an N pole and an S pole that are spaced apart in the X direction are spaced apart in parallel in the Y direction.
Each of the magnetized regions 121 and 122 has a uniform arrangement direction (magnetization direction) of the N and S poles, and each of the magnetized regions 121 and 122 is disposed between the N and S poles. The non-magnetized region 123 is formed so that the residual magnetic flux density is negligible.

The magnet 120 is provided between the magnetized regions 121 and 122, extends in a strip shape along the X direction, and has a non-magnetized region 124 that is low enough to ignore the residual magnetic flux density. The residual magnetic flux density refers to the magnetic flux density remaining in the magnetic material itself even when the external magnetic field is eliminated.
Then, the magnetic detection unit 110 has a non-magnetized region 124 in the Y direction with respect to the magnet 120 in a state (centered state) where the optical axis of the vibration reduction lens group 2 coincides with the optical axis I of the lens barrel. And is arranged so as to face a region corresponding to the central portion of the non-magnetized region 123 in the X direction.
The Y-direction position detection device 200 has the same configuration as that of the X-direction position detection device 100 except for the difference in device orientation corresponding to the difference in detection target direction.

Next, the effect of Example 1 mentioned above is demonstrated in contrast with the comparative example demonstrated below.
FIG. 3 is a diagram showing a configuration of a position detection device in a comparative example of the present invention. In addition, the same code | symbol is attached | subjected about the part similar to the X direction position detection apparatus 100 of Example 1 mentioned above, description is abbreviate | omitted, and a difference is mainly demonstrated.
The magnet 520 of the position detection device 500 of the comparative example includes a pair of N poles and S poles separated in the X direction, and these N poles and S poles are provided in the center of the magnet 520 in the Y direction, respectively. It has been. The magnetic detection unit 110 is disposed so as to face an intermediate portion between the N pole and the S pole of the magnet 520 in a state where the optical axis of the vibration reduction lens group 2 coincides with the optical axis I of the lens barrel. Yes.

FIG. 4 is a graph illustrating an output example of the magnetic detection unit 110 with respect to the position in the X direction (detection direction) of the magnet 120 in the X direction position detection apparatus 100 according to the first embodiment. In FIG. 4, the horizontal axis indicates the relative position of the magnet 120 based on the state in which the blur correction lens group 2 is centered, and the vertical axis indicates the output of the magnetic detection unit 110.
The output of the magnetic detection unit 110 becomes 0 when the magnet 120 is in the centered state, and increases as the amount of displacement from the magnet 120 increases, and the polarity reverses in accordance with the direction of displacement. Based on the above, the displacement of the magnet 120 with respect to the magnetic detection unit 110 can be detected.
Such a tendency is common to the position detection device 500 of the comparative example.

  On the other hand, FIG. 5 shows a magnetic detection unit for the position in the Y direction (non-detection direction) relative to the magnetic detection unit 110 of the magnets 120 and 520 in the X direction position detection device 100 of the first embodiment and the position detection device 500 of the comparative example. 10 is a graph showing an output example of 110; In FIG. 5, the horizontal axis indicates the relative position of the magnets 120 and 520 with the blur correction lens group 2 centered in the Y direction and the X direction with reference to a state with an output of (+), and the vertical axis indicates magnetic detection. The output of the part 110 is shown. In the figure, Example 1 is indicated by a solid line and a comparative example is indicated by a broken line.

In this case, the output of the magnetic detection unit 110 becomes maximum when the magnets 120 and 520 are not displaced, and gradually decreases as the amount of displacement therefrom increases.
As described above, even when the magnets 120 and 520 are displaced in the non-detection direction with respect to the magnetic detection unit 110, the output of the magnetic detection unit 110 changes, so that an error occurs in position detection in the detection direction. In the first embodiment, the output change of the magnetic detection unit 110 with respect to the displacement in the non-detection direction is smaller than that in the comparative example. This point will be described in detail below.

FIG. 6 illustrates a magnetic detection unit according to the position in the Y direction (non-detection direction) of the magnets 120 and 520 with respect to the magnetic detection unit 110 in the X direction position detection device 100 according to the first embodiment and the position detection device 500 according to the comparative example. 10 is a graph showing a simulation result of magnetic field strength at 110; In FIG. 6, the horizontal axis indicates the displacement of the magnets 120 and 520 from the state in which the blur correction lens group 2 is centered in the Y direction, and the vertical axis indicates the normalized magnetic field strength.
The prerequisites for this simulation are as follows.
(1) Thickness of the lens barrel of the magnets 120 and 520 in the optical axis I direction: 1.0 mm
(2) Length of magnets 120 and 520 in the X direction: 1.65 mm
(3) Length of magnets 120 and 520 in the Y direction: 3.0 mm
(4) Distance between N pole and S pole in the X direction: 1.0 mm
(5) Distance between magnets 120 and 520 and magnetic detector 110: 1.0 mm
(6) Width of the non-magnetized region 124 in the Y direction: 0.2 mm (Example 1 only)

As shown in FIG. 6, in the comparative example, when the magnet 520 moves 0.6 mm in the non-detection direction (Y direction) from the state in which the blur correction lens group 2 is centered in the Y direction, the magnetic detection unit 110. The magnetic field strength at is reduced by about 6%, which causes an error in position detection.
On the other hand, in the first embodiment, even when the magnet 120 is moved, the decrease in the magnetic field strength can be suppressed to about 1.5%, so that the position detection error can be reduced.

  As described above, according to the first embodiment, since the non-magnetized region 124 extending along the detection direction (X direction) is disposed between the magnetization regions 121 and 122, the non-detection direction (Y direction). ) Is leveled, and changes in the output of the magnetic detection unit 110 when the magnet 120 is displaced in the Y direction with respect to the magnetic detection unit 110 can be suppressed. Thereby, the detection accuracy of the position detection device can be ensured.

  Next, a second embodiment of the position detection apparatus to which the present invention is applied will be described. Note that, in each embodiment described below, the same parts as those in the first embodiment described above are denoted by the same reference numerals, description thereof is omitted, and differences are mainly described.

FIG. 7 is a diagram illustrating a configuration of the X-direction position detection device 300 according to the second embodiment. Fig.7 (a) is a figure which shows the state seen from the optical-axis I side, FIG.7 (b) is a bb part arrow directional view of Fig.7 (a).
The magnet 320 of the X-direction position detection device 300 includes a low magnetization region 325 instead of the non-magnetization region 124 in the magnet 120 of the first embodiment.
The low magnetization region 325 has an N pole and an S pole that are sandwiched between the N poles and the S poles of the magnetization regions 121 and 122, respectively, and these N poles and S poles have adjacent magnetic flux densities. It is made smaller than the N pole and S pole of the magnetized regions 121 and 122.
Note that the X-direction position detection device 300 is arranged so that the magnetic detection unit 110 faces the central portion in the X direction of the low magnetization region 325 in a state where the blur correction lens group 2 is centered.
According to the second embodiment described above, in addition to the same effects as the first embodiment described above, the degree of freedom in adjusting the magnetic intensity distribution in the non-detection direction can be improved by setting the magnetic flux density of the low magnetization region 325.

FIG. 8 is a diagram illustrating the configuration of the X-direction position detection device 400 according to the third embodiment. FIG. 8A is a diagram showing a state viewed from the optical axis I side, and FIGS. 7B and 7C are views taken along the line bb in FIG. 7A, respectively. FIG.
The magnet 420 of the X-direction position detection device 400 includes a pair of N poles and S poles that are spaced apart from each other in the X direction. These N pole and S pole are provided at the center of the magnet 420 in the Y direction. Further, the magnet 420 is provided with a groove portion 426 formed by denting a surface portion facing the magnetic detection portion 110.
The groove portion 426 extends substantially linearly in the X direction, and is disposed at a substantially central portion of the magnet 420 in the Y direction. The above-described N pole and S pole are respectively disposed on the bottom surface of the groove 426. The cross section of the groove part 426 is formed in a rectangular shape, for example, and is substantially constant in the groove part 426 in the longitudinal direction.
Note that the X-direction position detection device 400 is arranged so that the magnetic detection unit 110 faces the substantially central portion of the N-pole and S-pole of the magnet 420 in a state where the shake correction lens group 2 is centered.
According to the third embodiment described above, in addition to the same effects as those of the first and second embodiments described above, the number of magnetized places can be reduced.

(Modification)
The present invention is not limited to the embodiments described above, and various modifications and changes can be made, and these are also within the equivalent scope of the present invention.
(1) In the first and second embodiments, either the non-magnetized region or the low-magnetized region is arranged between the plurality of magnetized regions. And may be arranged in combination. Further, the non-magnetized region and the low-magnetized region may be provided on at least one of the north pole side and the south pole side of the relative movement unit.
(2) A relative moving part having a non-magnetized region and a low-magnetized region as in Example 1 and Example 2 is locally magnetized using a magnetic body formed integrally with the magnetized regions on both sides thereof. It may be formed with different presence / absence and degree, but it can be formed by combining different magnetic bodies with different presence / absence and degree of magnetization, or by forming a part corresponding to non-magnetized region with non-magnetic material. May be.
(3) Although the third embodiment includes a groove having a rectangular cross section extending in the detection direction as a recess, the shape of the recess is not limited to this, and may be other shapes, and the N pole side and the S pole side You may form a recessed part only in one of these.
(4) Like Example 1 and Example 2, you may form recessed parts, such as a groove part like Example 3, in the relative movement part in which the non-magnetization area | region and the low magnetization area | region were formed.

It is the schematic which shows the structure of the blurring correction apparatus provided with Example 1 of the position detection apparatus to which this invention is applied. It is an enlarged view of the X direction position detection apparatus in the shake correction apparatus of FIG. It is a figure which shows the structure of the position detection apparatus in the comparative example of this invention. It is a graph which shows the example of an output of the magnetic detection part according to the position of the detection direction with respect to the magnetic detection part of the magnet in the position detection apparatus of Example 1. It is a graph which shows the output example of the magnetic detection part according to the position of the non-detection direction with respect to the magnetic detection part of the magnet in the position detection apparatus of Example 1 and a comparative example. It is a graph which shows the simulation result of the magnetic field intensity according to the position of the non-detection direction with respect to the magnetic detection part of the magnet in the position detection apparatus of Example 1 and a comparative example. It is a figure which shows the structure of the position detection apparatus of Example 2 to which this invention is applied. It is a figure which shows the structure of the position detection apparatus of Example 3 to which this invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shake correction apparatus 2 Shake correction lens group 3 Movable lens frame 4 X direction actuator 5 Y direction actuator 100 X direction position detection apparatus 110 Magnetic detection part 120 Magnet 121,122 Magnetization area 124 Non-magnetization area

Claims (10)

A plurality of N poles are provided on one end side along the first direction and spaced apart in a second direction substantially orthogonal to the first direction, and on the other end side along the first direction in the second direction. A plurality of S poles spaced apart from each other, a relative moving part including a non-magnetized region extending in the first direction between the plurality of N poles and between the plurality of S poles;
A magnetic detection unit that is provided to face the relative movement unit so as to be capable of relative movement with respect to the relative movement unit in the first direction and the second direction, and that detects magnetism of the N pole and the S pole. ,
A position detection device that detects a relative position of the relative movement unit and the magnetic detection unit in the first direction. A plurality of N poles are provided on one end side along the first direction and spaced apart in a second direction substantially orthogonal to the first direction, and on the other end side along the first direction in the second direction. A plurality of S poles spaced apart from each other, and a low magnetization region having a lower magnetic flux density than the plurality of N poles and the plurality of S poles between the plurality of N poles and between the plurality of S poles A relative movement part provided with,
A magnetic detection unit that is provided to face the relative movement unit so as to be capable of relative movement with respect to the relative movement unit in the first direction and the second direction, and that detects magnetism of the N pole and the S pole. ,
A position detection device that detects a relative position of the relative movement unit and the magnetic detection unit in the first direction. N pole is provided on one end side along the first direction, the S pole provided with the other end to the first direction, said the surface facing the magnetic detection portion of the N pole and the S pole A relative movement part provided with a recess parallel to the first direction;
It is provided to face the relative movement unit so as to be relatively movable in the first direction and a second direction substantially orthogonal to the first direction with respect to the relative movement unit, and detects the magnetism of the N pole and the S pole. and a said magnetic detection unit for,
A position detection device that detects a relative position of the relative movement unit and the magnetic detection unit in the first direction. An image stabilization optical system;
A blur correction optical system support unit that supports the blur correction optical system movably along a plane orthogonal to the optical axis;
A drive unit that drives the blur correction optical system in a direction substantially orthogonal to the optical axis with respect to the blur correction optical system support;
The position according to any one of claims 1 to 3, further comprising: a magnetic detection unit fixed to one of the blur correction optical system and the blur correction optical system support unit, and a relative movement unit fixed to the other. A blur correction device comprising: a detection device. A first magnetism generating section that is provided on one end side along the first direction and generates magnetism;
A second magnetic generation that is provided on the one end side in a second direction intersecting the first direction and spaced from the first magnetic generation unit, and generates magnetism having the same polarity as the first magnetic generation unit. And
A third magnetic generator that is provided on the other end side along the first direction and generates magnetism having a polarity different from that of the first magnetic generator;
A fourth magnetic generation unit provided on the other end side at a distance from the third magnetic generation unit in the second direction and generating magnetism having the same polarity as the third magnetic generation unit;
A first low magnetic part that is provided between the first magnetic generation part and the second magnetic generation part and that generates a lower magnetism than the first magnetic generation part and the second magnetic generation part; ,
A second low magnetic unit that is provided between the third magnetic generation unit and the fourth magnetic generation unit and generates a lower magnetism than the third magnetic generation unit and the fourth magnetic generation unit; ,
The first magnetic generation unit, the second magnetic generation unit, the third magnetic generation unit, and the fourth magnetic generation unit are relatively movable in the first direction and the second direction, and A magnetic detection unit that detects the magnetism generated from the first magnetic generation unit, the second magnetic generation unit, the third magnetic generation unit, and the fourth magnetic generation unit,
Detecting a relative position in the first direction between the magnetic detection unit, the first magnetic generation unit, the second magnetic generation unit, the third magnetic generation unit, and the fourth magnetic generation unit; A position detection device characterized by the above. The position detection device according to claim 5,
The magnetic detection unit is configured to face the first low magnetic unit and the second low magnetic unit along the first direction along the first direction, the second magnetic generation unit, the third magnetic generation unit, and the third magnetic generation unit. It is movable relative to the magnetism generator and the fourth magnetism generator,
When the first magnetic generation unit, the second magnetic generation unit, the third magnetic generation unit, and the fourth magnetic generation unit move relative to the magnetic detection unit along the first direction, The position detection device is arranged so that the magnetism detected by the magnetism detection unit changes with a predetermined output characteristic with respect to the relative movement amount in the first direction. In the position detection device according to claim 5 or 6,
The first low magnetic part and the second low magnetic part are the first magnetic generation unit, the second magnetic generation unit, the third magnetic generation unit, and the fourth magnetic generation in the second direction. When the part and the magnetic detection part move relative to each other,
A position detection device, wherein the magnetic position detection error detected by the magnetic detection unit is arranged to be suppressed.   A blur correction device comprising the position detection device according to any one of claims 5 to 7.   A lens barrel comprising the blur correction device according to claim 4. An image stabilization optical system;
A blur correction optical system support that supports the blur correction optical system so as to be movable substantially along an XY plane composed of an X axis and a Y axis that are orthogonal to the optical axis and orthogonal to each other;
A drive unit that drives the blur correction optical system along the XY plane with respect to the blur correction optical system support;
The first and second position detection devices according to any one of claims 1 to 3 and claims 5 to 7 ,
The first position detecting device, up direction der that the first way direction is along the X axis,
It said second position detecting device, shake correcting device wherein the first way direction is the direction along the Y-axis direction.

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