JP2005275379A - Position-detecting apparatus of movable object and image blurring compensation apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus with wide moving range of a movable part including an image pick up device, etc. with which position detection using linear variation is possible in the position detection using a magnetic field variation detection element of an image blurring compensation apparatus. <P>SOLUTION: The image blur compensation apparatus is provided with the movable part 30a having the image pickup device 39a1 and movable in a first direction x perpendicular to a light axis of a photographic lens and a second direction y perpendicular to the light axis and the first direction and a fixed part 30b which supports the movable part 30a movable in the first and second directions. The movable part 30a has a horizontal hall-element hh10 used for position detection in the first direction of the movable part 30a and a vertical hall-element hv10 used for position detection in the second direction of the movable part 30a and all of an interval between magnets 411b1, 411b2 for position detection and drive in the horizontal direction and an interval between magnets 412b1, 412b2 for position detection and drive in the vertical direction are arranged by detaching for predetermined intervals. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image blur correction apparatus in an imaging apparatus, and more particularly to a position detection apparatus for a movable part such as an image sensor that has moved for image blur correction.

  Conventionally, image blurring on the image plane is suppressed by moving the image blur correction lens or image sensor on a plane perpendicular to the optical axis in accordance with the amount of camera shake that occurs during imaging in an imaging device such as a camera. An image blur correction device has been proposed.

Patent Document 1 discloses a device in which a movable part including an image blur correction lens is moved by a magnet and a coil, and position detection before and after the movement is performed by a Hall element and a magnet.
JP 2002-229090 A

  However, in the position detection of the movable part using the Hall element as in the device of Patent Document 1, the moving range of the movable part capable of highly accurate position detection using a linear change amount is about ± 0.5 mm. Since it is short, there is a limit to the moving range of the movable part of the image blur correction apparatus.

  Accordingly, an object of the present invention is to provide an apparatus having a wide moving range of a movable part including an image sensor that can perform position detection using a linear change amount in position detection using a magnetic field change detection element of an image blur correction apparatus. That is.

  An image blur correction apparatus for an image pickup apparatus according to the present invention includes either an image pickup element or an image blur correction lens, and is orthogonal to a first direction orthogonal to the optical axis of the photographing lens, and to the optical axis and the first direction. A movable portion movable in the second direction, and a fixed portion that supports the movable portion in a movable manner in the first and second directions, and either the movable portion or the fixed portion is arranged in the first direction of the movable portion. A magnetic field change detection unit having a horizontal direction magnetic field change detection element used for position detection and a vertical direction magnetic field change detection element used for position detection in the second direction of the movable unit; One of them has a position detection magnet part used for position detection in the first and second directions of the movable part at a position facing the magnetic field change detection part, and the position detection magnet part is connected to the optical axis. First horizontal position detection in which N pole and S pole are arranged in a parallel third direction And a second horizontal position detecting magnet in which the S pole and the N pole are arranged in the third direction, and the first horizontal direction in the first direction at a position facing the horizontal magnetic field change detecting element. A first pole in which the north pole of the position detection magnet and the south pole of the second horizontal position detection magnet are arranged for use in position detection in the first direction, and the north pole and the south pole are arranged in the third direction. It has a vertical position detection magnet and a second vertical position detection magnet in which the S pole and the N pole are arranged in the third direction, and in the second direction at a position facing the vertical magnetic field change detection element. The north pole of the first vertical position detection magnet and the south pole of the second vertical position detection magnet are arranged and used for position detection in the second direction, and between the first and second horizontal position detection magnets. , And the first and second vertical position detecting magnets are arranged at a predetermined interval.

  As a result, it is possible to widen the moving range of the movable part capable of detecting the position with high accuracy using the linear change amount.

  Preferably, the position detecting magnet section includes a first spacer made of a non-magnetic material in a space having a constant interval between the first and second horizontal position detecting magnets, and the first and second vertical directions. A second spacer made of a non-magnetic material is provided in the space of the predetermined interval between the position detection magnets. This makes it possible to maintain a constant interval against the attractive force generated between the north and south poles of the first and second position detection magnets.

  Preferably, when the optical axis is in a positional relationship passing through the vicinity of the center of one of the image sensor and the image blur correction lens, the position in the first direction of the horizontal magnetic field change detecting element is the first and second horizontal positions. The position in the second direction of the vertical direction magnetic field change detection element is in the vicinity of the same distance from the first and second vertical position detection magnets. This makes it possible to perform highly accurate position detection by effectively utilizing the moving range of the movable part.

  Preferably, the horizontal direction magnetic field change detecting element is compared to a case where the distance between the first and second horizontal position detecting magnets and the distance between the first and second vertical position detecting magnets are not apart from each other. , A voltage increase that increases the voltage value applied between the input terminals of each of the vertical magnetic field change detecting elements, or a horizontal potential difference between the output terminals of the horizontal magnetic field change detecting elements is amplified by the first amplification factor and the vertical direction At least one of potential difference amplification for amplifying the vertical potential difference between the output terminals of the magnetic field change detection element with the second amplification factor is performed. As a result, the magnetic flux density decreases due to the N pole and S pole being separated by a certain distance, and the output values of the horizontal magnetic field change detecting element and the vertical magnetic field change detecting element can be compensated for.

  More preferably, a horizontal subtracting amplifier circuit for obtaining a first detection position signal for specifying the position of the movable portion in the first direction by calculation including amplification of the first amplification factor in the horizontal potential difference, and second amplification in the vertical potential difference. A magnetic field change detection element signal processing circuit unit including a vertical direction subtraction amplification circuit that obtains a second detection position signal that specifies the position of the movable unit in the second direction by calculation including rate amplification;

  More preferably, the magnetic field change detecting element signal processing circuit unit includes a horizontal differential amplifier circuit that amplifies a signal difference between the output terminals of the horizontal magnetic field change detecting element and a signal between the output terminals of the vertical magnetic field change detecting element. A vertical differential amplifier circuit for amplifying the difference, a horizontal potential difference is obtained from the difference between the signal difference amplified by the horizontal differential amplifier circuit and the reference voltage, and amplified by the vertical differential amplifier circuit. The vertical potential difference is obtained from the difference between the signal difference and the reference voltage.

  More preferably, the horizontal differential amplifier circuit includes first and second horizontal operational amplifiers, the horizontal subtraction amplifier circuit includes a third horizontal operational amplifier, and the output terminal of the first horizontal operational amplifier is the first. The output terminal of the third horizontal operational amplifier is connected to the inverting input terminal of the third horizontal operational amplifier via the second horizontal resistor, and the third horizontal operational amplifier is connected to the inverting input terminal of the third horizontal operational amplifier. The output terminal of the two horizontal operational amplifiers is connected to the non-inverting input terminal of the third horizontal operational amplifier via the third horizontal resistance, and the non-inverting input terminal of the third horizontal operational amplifier is connected to the reference via the fourth horizontal resistance. The first and third horizontal resistances have the same resistance value, and the second and fourth horizontal resistances have the same resistance value and are larger than the first and third horizontal resistances. The amplification factor is increased, the vertical differential amplifier circuit has first and second vertical operational amplifiers, the vertical subtraction amplifier circuit has a third vertical operational amplifier, and an output terminal of the first vertical operational amplifier. Is connected to the inverting input terminal of the third vertical operational amplifier via the first vertical resistance, and the output terminal of the third vertical operational amplifier is connected to the inverting input terminal of the third vertical operational amplifier via the second vertical resistance. The output terminal of the second vertical operational amplifier is connected to the non-inverting input terminal of the third vertical operational amplifier via the third vertical resistance, and the non-inverting input terminal of the third vertical operational amplifier has the fourth vertical resistance. And the first and third vertical resistances have the same resistance value, and the second and fourth vertical resistances have the same resistance value and are larger than the first and third vertical resistances. By the above Increasing the value of 2 amplification factor.

  Preferably, the movable part has a magnetic field change detecting part, the fixed part has a position detecting magnet part at a position facing the magnetic field change detecting part, and the magnetic field change detecting part detects the horizontal magnetic field change. One element and one vertical magnetic field change detection element are provided.

  More preferably, the first and second horizontal position detecting magnets and the first and second vertical position detecting magnets are also used for moving the movable portion in the first and second directions.

  Preferably, the magnetic field change detection unit is a uniaxial Hall element, and both the horizontal magnetic field change detection element and the vertical magnetic field change detection element are Hall elements.

  The position detection device according to the present invention includes a movable part that is movable in the first direction and a fixed part that supports the movable part so as to be movable in the first direction, and one of the movable part and the fixed part is And a magnetic field change detecting unit having a magnetic field change detecting element used for detecting the position of the movable part in the first direction, and either the movable part or the fixed part is used for detecting the position of the movable part in the first direction. The position detection magnet unit is located at a position facing the magnetic field change detection unit, and the position detection magnet unit has a first position detection in which an N pole and an S pole are arranged in a direction perpendicular to the first direction. And a second position detection magnet in which the S pole and the N pole are arranged in a direction perpendicular to the first direction, and the first detection is performed in the first direction at a position facing the magnetic field change detection element. The north pole of the magnet and the south pole of the second position detecting magnet are arranged to detect the position in the first direction. The first and second position detection magnets are arranged at a fixed interval, and the change in magnetic field is detected as compared with the case where the first and second position detection magnets are not spaced apart from each other. At least one of a voltage increase for increasing a voltage value applied between the input terminals of the element and a potential difference amplification for amplifying a potential difference between the output terminals of the magnetic field change detecting element with a first amplification factor is performed. A magnetic field change detection element signal processing circuit unit having a generation circuit for obtaining a detection position signal for specifying the position of the movable unit in the first direction by an operation including amplification of

  As described above, according to the present invention, an apparatus having a wide moving range of a movable part including an image sensor that can perform position detection using a linear change amount in position detection using a magnetic field change detection element of an image blur correction apparatus. Can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The imaging device 1 will be described as a digital camera. In order to describe the direction, in the imaging device 1, the horizontal direction orthogonal to the optical axis LX is the first direction x, the vertical direction orthogonal to the optical axis LX is the second direction y, and the horizontal direction parallel to the optical axis LX is The third direction z will be described. FIG. 5 shows a configuration diagram in a cross section taken along line AA of FIG.

  The parts related to the imaging of the imaging apparatus 1 are the Pon button 11 for switching on / off the power, the release button 13, the LCD monitor 17, the CPU 21, the imaging block 22, the AE unit 23, the AF unit 24, and the imaging unit 39a of the image blur correcting unit 30. And a photographing lens 67. In response to pressing of the Pon button 11, the on / off state of the Pon switch 11 a is switched, and thereby the on / off state of the power supply of the imaging device 1 is switched. The subject image is captured as an optical image through the photographing lens 67 by the imaging block 22 that drives the imaging unit 39a, and the image captured by the LCD monitor 17 is displayed. The subject image can also be optically observed with an optical viewfinder (not shown).

  When the release button 13 is half-pressed, the photometry switch 12a is turned on to perform photometry, distance measurement, and focusing operation. When the release button 13 is fully pressed, the release switch 13a is turned on to take an image. Is stored in memory.

  The CPU 21 is a control unit that controls each unit related to imaging and controls each unit related to image blur correction described later.

  The imaging block 22 drives the imaging unit 39a. The AE unit 23 performs a photometric operation of the subject to calculate an exposure value, and calculates an aperture value and an exposure time necessary for photographing based on the exposure value. The AF unit 24 performs distance measurement, and performs focus adjustment by displacing the photographing lens 67 in the optical axis direction based on the distance measurement result.

  The parts relating to the image blur correction and the apparatus, that is, the image blur correction, of the imaging apparatus 1 are the image blur correction button 14, the CPU 21, the angular velocity detection unit 25, the driver circuit 29, the image blur correction unit 30, the Hall element signal processing circuit unit 45, and the photographing lens. 67.

  When the image blur correction button 14 is pressed, the image blur correction switch 14a is turned on, and the angular velocity detection unit 25 and the image blur correction unit 30 are driven at regular intervals independently of other operations such as photometry. Thus, image blur correction is performed. The parameter IS = 1 is set in the correction mode in which the image blur correction switch 14a is turned on, and the parameter IS = 0 is set in the correction mode in which the image blur correction switch 14a is not turned off. In the present embodiment, this fixed time will be described as 1 ms.

  Various outputs corresponding to the input signals of these switches are controlled by the CPU 21. On / off information of the photometry switch 12a, release switch 13a, and image blur correction switch 14a is input to the ports P12, P13, and P14 of the CPU 21 as 1-bit digital signals, respectively. The imaging block 22, the AE unit 23, and the AF unit 24 input and output signals at ports P3, P4, and P5, respectively.

  Next, the details of the angular velocity detection unit 25, the driver circuit 29, the image blur correction unit 30, the Hall element signal processing circuit unit 45, and the input / output relationship with the CPU 21 will be described.

  The angular velocity detection unit 25 includes first and second angular velocity sensors 26 and 27 and an amplifier / high pass filter circuit 28. The first and second angular velocity sensors 26 and 27 detect angular velocities in the first direction x and the second direction y every fixed time (1 ms) of the imaging device 1. The first angular velocity sensor 26 detects the angular velocity in the first direction x, and the second angular velocity sensor 27 detects the angular velocity in the second direction y. The amplifier / high-pass filter circuit 28 amplifies the signal related to the angular velocity, cuts the null voltage and panning of the first and second angular velocity sensors 26 and 27, and outputs an analog signal as the first and second angular velocities vx and vy of the CPU 21. Input to A / D0 and A / D1.

  The CPU 21 performs A / D conversion on the first and second angular velocities vx and vy input to A / D0 and A / D1, and then performs image blurring that occurs in a certain time (1 ms) by a conversion coefficient that takes into account the focal length and the like. Calculate the quantity. Therefore, the angular velocity detection unit 25 and the CPU 21 have an image blur amount calculation function.

  The CPU 21 calculates and sets the position S to be moved of the imaging unit 39a corresponding to the image blur amount obtained by the calculation for each of the first direction x and the second direction y. The first direction x component of the position S is sx, and the second direction y component is sy. Movement of the movable part 30a including the imaging part 39a is performed by an electromagnetic force described later. In order to move the movable part 30a to this position S, the first direction x component of the driving force D that drives the driver circuit 29 is defined as a first PWM duty dx, and the second direction y component is defined as a second PWM duty dy.

  The image blur correction unit 30 moves the imaging unit 39a to the position S to be moved calculated by the CPU 21, thereby eliminating the deviation of the optical axis LX on the imaging plane of the subject image caused by the blur and imaging with the subject image. This is a device that keeps the surface position constant and corrects image blur, and includes a movable part 30a including an imaging part 39a and a movable area, and a fixed part 30b. The image blur correction unit 30 includes a driving part that moves the movable part 30a by an electromagnetic force generated by the direction of the current flowing through the coil and the direction of the magnetic field of the magnet, and a position detection part that detects the position of the movable part 30a. It can be divided into two categories.

  Driving of the movable portion 30a of the image blur correction unit 30 is performed by a driver circuit 29 that receives the output of the first PWM duty dx from the PWM0 and the second PWM duty dy from the PWM1 of the CPU 21. The position P before or after the movement of the movable part 30a moved by driving the driver circuit 29 is detected by the Hall element part 44a and the Hall element signal processing circuit part 45. Information on the detected position P is input to A / D2 and A / D3 of the CPU 21 as the first detection position signal px as the first direction x component and the second detection position signal py as the second direction y component, respectively. . The first and second detection position signals px and py are A / D converted via A / D2 and A / D3. The first direction x component and the second direction y component of the position P after A / D conversion with respect to the first and second detection position signals px and py are set to pdx and pdy, respectively. PID control is performed based on the data of the detected position P (pdx, pdy) and the data of the position S (sx, sy) to be moved.

  The movable portion 30a includes first and second drive coils 31a and 32a, an imaging portion 39a, a hall element portion 44a, a movable substrate 49a, a movement shaft 50a, first to third horizontal movement bearing portions 51a to 53a, and a plate. 64a.

  The fixed portion 30b includes a position detecting and driving magnet portion 410b, first and second position detecting and driving yokes 431b and 432b, first to fourth vertical movement bearing portions 54b to 57b, and a base plate 65b. The position detection and drive magnet unit 410b includes four first and second horizontal position detection and drive magnets 411b1 and 411b2, and first and second vertical position detection and drive magnets 412b1 and 412b2. Details will be described later.

  The U-shaped moving shaft 50a viewed from the third direction z of the movable portion 30a is perpendicular to the first to fourth vertical moving bearing portions 54b to 57b attached to the base plate 65b of the fixed portion 30b. It is supported so as to be movable in the (second direction y). The first and second vertical movement bearing portions 54b and 55b have a long hole shape extending in the second direction y when viewed from the first direction x. Thereby, the movable part 30a can move in the vertical direction with respect to the fixed part 30b.

  The moving shaft 50a is supported so as to be movable in the horizontal direction (first direction x) with the first to third horizontal moving bearing portions 51a to 53a of the movable portion 30a. Thereby, the movable part 30a excluding the moving shaft 50a can move in the horizontal direction with respect to the moving shaft 50a and the fixed part 30b.

  In order to make maximum use of the imaging range of the image sensor 39a1, when the optical axis LX of the photographic lens 67 is in a positional relationship passing through the vicinity of the center of the image sensor 39a1, the movable portion 30a is provided in both the first direction x and the second direction y. The positional relationship between the movable part 30a and the fixed part 30b is set so as to be located at the center of the movement range (at the movement center position). The center of the image sensor 39a1 refers to the intersection of two diagonal lines of a rectangle that forms the imaging surface of the image sensor 39a1.

  The movable unit 30a is attached with an imaging unit 39a, a plate 64a, and a movable substrate 49a in the optical axis direction when viewed from the direction of the photographing lens 67. The imaging unit 39a includes an imaging element 39a1, a stage 39a2, a pressing unit 39a3, and an optical low-pass filter 39a4. The stage 39a2 and the plate 64a sandwich and urge the imaging element 39a1, the pressing unit 39a3, and the optical low-pass filter 39a4. The first to third horizontal movement bearing portions 51a to 53a are attached to the stage 39a2. The plate 64 a is positioned so that the image sensor 39 a 1 is perpendicular to the optical axis LX of the photographic lens 67 when the image sensor 39 a 1 is attached. Further, when the plate 64a is made of a metal material, the plate 64a is further brought into a heat radiation effect by being in contact with the image sensor 39a1.

  The movable substrate 49a is attached with first and second driving coils 31a and 32a on which a sheet-like and spiral coil pattern is formed, and a hall element portion 44a. The first driving coil 31a has a movable part 30a including the first driving coil 31a by the electromagnetic force generated from the direction of the current of the first driving coil 31a and the direction of the magnetic field of the first position detection and driving magnet 411b. In order to move in one direction x, a coil pattern formed by a line parallel to either the first direction x or the second direction y is provided. The second driving coil 32a has the movable part 30a including the second driving coil 32a in the first position by the electromagnetic force generated from the direction of the current of the second driving coil 32a and the direction of the magnetic field of the second position detecting and driving magnet 412b. In order to move in two directions y, a coil pattern formed by a line parallel to either the first direction x or the second direction y is provided. The Hall element portion 44a will be described later.

  The first and second driving coils 31a and 32a are connected to a driver circuit 29 for driving them via a flexible substrate (not shown). The driver circuit 29 receives the first and second PWM duties dx and dy from the PWM0 and PWM1 of the CPU 21, respectively. The driver circuit 29 supplies power to the first and second drive coils 31a and 32a in accordance with the input first and second PWM duties dx and dy, and drives the movable portion 30a.

  The first and second horizontal position detection and drive magnets 411b1 and 411b2 are attached to the movable portion 30a side of the fixed portion 30b so as to face the first drive coil 31a and the horizontal hall element hh10. The first and second vertical position detection and drive magnets 412b1 and 412b2 are attached to the movable portion 30a side of the fixed portion 30b so as to face the second drive coil 32a and the vertical hall element hv10.

  The first horizontal position detection and drive magnet 411b1 has N poles and S poles arranged in the third direction z, and the second horizontal position detection and drive magnet 411b2 has S poles and N poles in the third direction z. Are arranged. The first and second horizontal position detection and drive magnets 411b1 and 411b2 are mounted on the base plate 65b of the fixed portion 30b and on the movable portion 30a side in the third direction z, and the first position detection and drive yoke 431b. The N pole of the first horizontal position detection and drive magnet 411b1 and the S pole of the second horizontal position detection and drive magnet 411b2 are mounted side by side in the first direction x. The lengths of the first and second horizontal position detection and drive magnets 411b1 and 411b2 in the second direction y are the first drive coil 31a and the horizontal hall element when the movable part 30a moves in the second direction y. The first driving coil 31a is set to be longer than the first effective length L1 in the second direction y to the extent that the magnetic field exerted on hh10 does not change.

  The position detecting and driving magnet unit 410b includes a first spacer 411bm made of a non-magnetic material between the first and second horizontal position detecting and driving magnets 411b1 and 411b2. The first spacer 411bm has a substantially rectangular parallelepiped shape having a width d in the first direction x, and maintains a constant distance d between the first and second horizontal position detection and drive magnets 411b1 and 411b2. The first spacer 411bm may have a configuration in which there is no gap in the second direction y as long as the first and second horizontal position detection and drive magnets 411b1 and 411b2 are maintained at a constant distance d. (Refer FIG. 6) The structure with a clearance gap may be sufficient (refer FIG. 7).

  The first and second horizontal position detection and drive magnets 411b1 and 411b2 are attracted to each other in the third direction z because the polarities are arranged in opposite directions. However, the presence of the first spacer 411bm 1. The distance between the second horizontal position detecting and driving magnets 411b1 and 411b2 can be maintained at a constant interval d. However, if the first and second horizontal position detection and drive magnets 411b1 and 411b2 can be mounted on the first position detection and drive yoke 431b so as to keep a constant distance d, the first spacer 411bm can be omitted. Good.

  The first vertical position detection and drive magnet 412b1 has N poles and S poles arranged in the third direction z, and the second vertical position detection and drive magnet 412b2 has S poles and N poles in the third direction z. Are arranged. The first and second vertical position detecting and driving magnets 412b1 and 412b2 are mounted on the base plate 65b of the fixed portion 30b and on the movable portion 30a side in the third direction z, and the second position detecting and driving yoke 432b. In the second direction y, the north pole of the first vertical position detection and driving magnet 412b1 and the south pole of the second vertical position detection and driving magnet 412b2 are mounted side by side. The lengths of the first and second vertical position detection and drive magnets 412b1 and 412b2 in the first direction x are the same as the second drive coil 32a and the vertical hall element when the movable part 30a moves in the first direction x. It is set longer than the second effective length L2 in the first direction x of the second driving coil 32a so that the magnetic field exerted on the hv10 does not change.

  The position detection and drive magnet unit 410b includes a second spacer 412bm made of a non-magnetic material between the first and second vertical position detection and drive magnets 412b1 and 412b2. The second spacer 412bm has a substantially rectangular parallelepiped shape having a width d in the second direction y, and maintains a constant distance d between the first and second vertical position detecting and driving magnets 412b1 and 412b2. The second spacer 412bm may have a configuration in which there is no gap in the first direction x as long as the second spacer 412bm is configured to maintain a constant distance d between the first and second vertical position detection and driving magnets 412b1 and 412b2. Further, there may be a configuration with a gap (not shown).

  The first and second vertical position detection and drive magnets 412b1 and 412b2 are attracted to each other in the third direction z because the polarities are arranged in opposite directions. However, the presence of the second spacer 412bm 1. The distance between the second vertical position detection and driving magnets 412b1 and 412b2 can be maintained at a constant interval d. However, if the first and second vertical position detecting and driving magnets 412b1 and 412b2 can be mounted on the second position detecting and driving yoke 432b so as to keep the constant distance d, the second spacer 412bm is not necessary. Good.

  The first position detecting and driving yoke 431b is made of a polygonal soft magnetic material having a U-shape when viewed in the second direction y, and the first and second horizontal position detecting and driving magnets 411b1. 411b2, the first drive coil 31a, and the horizontal hall element hh10 are mounted on the base plate 65b of the fixed portion 30b so as to be sandwiched in the third direction z. The first and second horizontal position detection and drive magnets 411b1 and 411b2 in the first position detection and drive yoke 431b are in contact with the first and second horizontal position detection and drive magnets 411b1 and 411b2. It serves to prevent the magnetic field from leaking to the surroundings. The first and second horizontal position detection and drive magnets 411b1 and 411b2, the first drive coil 31a, and the portion facing the movable substrate 49a in the first position detection and drive yoke 431b are first and second. 2 The magnetic flux density between the horizontal position detecting and driving magnets 411b1 and 411b2 and the first driving coil 31a, and the first and second horizontal position detecting and driving magnets 411b1 and 411b2 and the horizontal hall element hh10. Play a role to raise.

  The second position detection and drive yoke 432b is made of a polygonal soft magnetic material having a U-shape when viewed in the first direction x, and the first and second vertical position detection and drive magnets 412b1. 412b2, the second driving coil 32a, and the vertical hall element hv10 are mounted on the base plate 65b of the fixed portion 30b so as to be sandwiched in the third direction z. The portions of the second position detection and drive yoke 432b that are in contact with the first and second vertical position detection and drive magnets 412b1 and 412b2 are the first and second vertical position detection and drive magnets 412b1 and 412b2. It serves to prevent the magnetic field from leaking to the surroundings. The first and second vertical position detection and drive magnets 412b1 and 412b2, the second drive coil 32a, and the portion facing the movable substrate 49a in the second position detection and drive yoke 432b are the first and second portions. 2 Magnetic flux density between the vertical position detecting and driving magnets 412b1, 412b2 and the second driving coil 32a, and the first and second vertical position detecting and driving magnets 412b1, 412b2 and the vertical hall element hv10. Play a role to raise.

  The hall element unit 44a has two hall elements that are magnetoelectric conversion elements (magnetic field change detection elements) using the Hall effect, and the current position P (first direction) in the first direction x and the second direction y of the movable part 30a. This is a uniaxial Hall element that detects a detection position signal px and a second detection position signal py). Of the two hall elements, a hall element for position detection in the first direction x is a horizontal hall element hh10, and a hall element for position detection in the second direction y is a vertical hall element hv10.

  The horizontal hall element hh10 is located on the movable substrate 49a of the movable part 30a when viewed from the third direction z, and faces the first and second horizontal position detection and drive magnets 411b1 and 411b2 of the fixed part 30b. Attached to. The vertical hall element hv10 is located on the movable substrate 49a of the movable part 30a when viewed from the third direction z, and faces the first and second vertical position detection and driving magnets 412b1, 412b2 of the fixed part 30b. Attached to.

  In order to perform position detection by making the most of the range in which position detection with high accuracy can be performed using the linear change amount, the position of the horizontal hall element hh10 in the first direction x is light near the center of the image sensor 39a1. When the positional relationship passes through the axis LX, the first spacer 411bm is located near the middle in the first direction x, that is, in the vicinity of the first and second horizontal position detection and driving magnets 411b1 and 411b2. It is desirable. Similarly, the position of the vertical hall element hv10 in the second direction y faces the middle vicinity of the second spacer 412bm in the second direction y when the vicinity of the center of the imaging element 39a1 is in a positional relationship passing through the optical axis LX. It is desirable to be in the vicinity of the place, that is, the first and second vertical position detection and drive magnets 412b1, 412b2, respectively.

  The base plate 65b is a plate-like member that serves as a base to which the first and second position detection and drive yokes 431b and 432b are attached in the fixed portion 30b, and is arranged in parallel with the imaging surface of the imaging element 39a1. In the present embodiment, the base plate 65b is closer to the photographing lens 67 than the movable substrate 49a in the third direction z, but the positional relationship is such that the movable substrate 49a is closer to the photographing lens 67. There may be. In this case, the first and second driving coils 31a and 32a and the hall element portion 44a are on the opposite side of the movable substrate 49a to the side where the photographing lens 67 is located, and the position detection and driving magnet portion 410b is a photographing lens on the base plate 65b. 67 is arranged on the side where there is.

  The hall element signal processing circuit unit 45 detects the horizontal potential difference x10 between the output terminals of the horizontal hall element hh10 from the output signal of the horizontal hall element hh10, and identifies the position in the first direction x based on the detected horizontal potential difference x10. A vertical potential difference y10 between the output terminals of the vertical hall element hv10 is detected from the first hall element signal processing circuit 450 that outputs the signal px to the A / D2 of the CPU 21 and the output signal of the vertical hall element hv10. A second hall element signal processing circuit 460 for outputting a second detection position signal py for specifying the position in the second direction y to the A / D 3 of the CPU 21.

  A circuit configuration relating to input / output signals of the horizontal hall element hh10 and the vertical hall element hv10 in the first and second hall element signal processing circuits 450 and 460 will be described.

  In the first hall element signal processing circuit 450, the output section of the horizontal hall element hh10 has a horizontal differential amplifier circuit 451 and a horizontal subtraction amplifier circuit 453, and the input section has a horizontal input circuit 456. The output unit of the vertical hall element hv10 in the second hall element signal processing circuit 460 includes a vertical direction differential amplification circuit 461 and a vertical direction subtraction amplification circuit 463, and the input unit includes a vertical direction input circuit 466.

  An output terminal of the horizontal hall element hh10 is connected to a horizontal differential amplifier circuit 451, and the horizontal differential amplifier circuit 451 is connected to a horizontal subtraction amplifier circuit 453. The horizontal differential amplifier circuit 451 is a differential amplifier circuit that amplifies a signal difference between output terminals of the horizontal hall element hh10. The horizontal subtraction amplifier circuit 453 obtains a horizontal potential difference x10 (hall output voltage) between the output terminals of the horizontal hall element hh10 from the difference between the amplified signal difference and the reference voltage Vref, and gives a constant first amplification factor thereto. This is a subtraction amplification circuit that multiplies to obtain a first detection position signal px.

  The horizontal differential amplifier circuit 451 includes first to third resistors R1 to R3, and first and second horizontal operational amplifiers A1 and A2. One of the output terminals of the horizontal hall element hh10 is connected to the non-inverting input terminal of the first horizontal operational amplifier A1, and the other terminal is connected to the non-inverting input terminal of the second horizontal operational amplifier A2. The inverting input terminal of the first horizontal operational amplifier A1 is connected to the first and second resistors R1 and R2, and the inverting input terminal of the second horizontal operational amplifier A2 is connected to the first and third resistors R1 and R3. The output terminal of the first horizontal operational amplifier A1 is connected to the second resistor R2 and the first horizontal resistor R7 of the horizontal subtracting amplifier circuit 453. The output terminal of the second horizontal operational amplifier A2 is connected to the third resistor R3 and the third horizontal resistor R9 of the horizontal subtracting amplifier circuit 453.

  The horizontal subtraction amplifier circuit 453 includes first to fourth horizontal resistances R7 to R10 and a third horizontal operational amplifier A5. The inverting input terminal of the third horizontal operational amplifier A5 is connected to the first horizontal resistor R7 and the second horizontal resistor R8, and the non-inverting input terminal is connected to the third horizontal resistor R9 and the fourth horizontal resistor R10. The output terminal is connected to the second horizontal resistance R8, and a first detection position signal px obtained by multiplying the horizontal potential difference x10 by a constant first amplification factor is output. One terminal of the fourth horizontal resistance R10 is connected to the power source of the reference voltage Vref.

  The second and third resistors R2 and R3 are set to the same resistance value, the first and third horizontal resistors R7 and R9 are set to the same resistance value, and the second and fourth horizontal resistors R8 and R10 are set to the same resistance value. The value of the first amplification factor is determined by the values of the first to fourth horizontal resistances R7 to R10.

  The horizontal direction input circuit 456 includes a nineteenth resistor R19 and an eighth operational amplifier A8. The inverting input terminal of the eighth operational amplifier A8 is connected to one of the nineteenth resistor R19 and the input terminal of the horizontal hall element hh10. The potential of the non-inverting input terminal of the eighth operational amplifier A8 is set to the first constant voltage XVf corresponding to the constant current value at the input terminal of the horizontal hall element hh10. The output terminal of the eighth operational amplifier A8 is connected to one input terminal of the horizontal hall element hh10. One terminal of the nineteenth resistor R19 is grounded.

  An output terminal of the vertical hall element hv10 is connected to the vertical differential amplifier circuit 461, and the vertical differential amplifier circuit 461 is connected to the vertical subtraction amplifier circuit 463. The vertical differential amplifier circuit 461 is a differential amplifier circuit that amplifies a signal difference between the output terminals of the vertical hall element hv10. The vertical subtraction amplification circuit 463 obtains a vertical potential difference y10 (hall output voltage) between output terminals of the vertical hall element hv10 from the difference between the amplified signal difference and the reference voltage Vref, and a constant second amplification factor is obtained therefrom. This is a subtraction amplification circuit that multiplies and obtains the second detection position signal py.

  The vertical differential amplifier circuit 461 includes 21st to 23rd resistors R21 to R23, and first and second vertical operational amplifiers A21 and A22. One of the output terminals of the vertical hall element hv10 is connected to the non-inverting input terminal of the first vertical operational amplifier A21, and the other terminal is connected to the non-inverting input terminal of the second vertical operational amplifier A22. The inverting input terminal of the first vertical operational amplifier A21 is connected to the 21st and 22nd resistors R21 and R22, and the inverting input terminal of the second vertical operational amplifier A22 is connected to the 21st and 23rd resistors R21 and R23. The output terminal of the first vertical operational amplifier A21 is connected to the 22nd resistor R22 and the first vertical resistor R27 of the vertical subtracting amplifier circuit 463. The output terminal of the second vertical operational amplifier A22 is connected to the 23rd resistor R23 and the third vertical resistor R29 of the vertical subtracting amplifier circuit 463.

  The vertical subtraction amplification circuit 463 includes first to fourth vertical resistances R27 to R30 and a third vertical operational amplifier A25. The inverting input terminal of the third vertical operational amplifier A25 is connected to the first vertical resistance R27 and the second vertical resistance R28, and the non-inverting input terminal is connected to the third vertical resistance R29 and the fourth vertical resistance R30. The output terminal is connected to the second vertical resistance R28, and a second detection position signal py obtained by multiplying the vertical potential difference y10 by a constant second amplification factor is output. One terminal of the fourth vertical resistance R30 is connected to the power source of the reference voltage Vref.

  The twenty-second and twenty-third resistances R22 and R23 are set to the same resistance value, the first and third vertical resistances R27 and R29 are set to the same resistance value, and the second and fourth vertical resistances R28 and R30 are set to the same resistance value. The value of the second amplification factor is determined by the values of the first to fourth vertical resistances R27 to R30.

  The vertical direction input circuit 466 includes a 39th resistor R39 and a 28th operational amplifier A28. The inverting input terminal of the 28th operational amplifier A28 is connected to one of the 39th resistor R39 and the input terminal of the vertical hall element hv10. The potential at the non-inverting input terminal of the 28th operational amplifier A28 is set to the second constant voltage YVf corresponding to the constant current value at the input terminal of the vertical hall element hv10. The output terminal of the 28th operational amplifier A28 is connected to one input terminal of the vertical hall element hv10. One terminal of the 39th resistor R39 is grounded.

  In the prior art, there is no space between the portions corresponding to the first and second horizontal position detection and drive magnets 411b1 and 411b2. In the present embodiment, a first spacer 411bm is provided between the first and second horizontal position detection and drive magnets 411b1 and 411b2. Due to the presence of the width d of the first spacer 411bm, a range dd in which position detection with high accuracy can be performed using a linear change amount becomes large. As a result, the moving range of the movable portion 30a can be increased.

  FIG. 9 shows the relationship between the position of the horizontal hall element hh10 and the first detection position signal px which is the output value. In the graph, when the movement center position is taken as the origin, the space between the first horizontal position detection / drive magnet 411b1 and the second horizontal position detection / drive magnet 411b2 is small and the value of d is small (1). , D shows a large number (2). Both graphs have point-symmetric shapes with the movement center position as the center. In the graph (1), the width of the range dd in which the relationship between the horizontal hall element hh10 and the first detection position signal px is linearly shown is small. On the other hand, in the graph (2), the width of a range dd in which the relationship between the horizontal hall element hh10 and the first detection position signal px is linearly shown is large.

  For example, when there is no fixed interval d, dd = ± 0.5 mm, whereas dd = ± 0.6 mm when d = 0.5 mm, dd = ± 0.7 mm when d = 1.0 mm, When d = 1.5 mm, dd = ± 1.0 mm, and increasing the value of d increases the value of dd.

  In a range in which the relationship between the Hall element and its output value is shown linearly, position detection with higher accuracy is possible than in a non-linear range. Therefore, in position detection using a Hall element, there is an advantage that the movable range in which position detection with high accuracy can be increased as the range in which the relationship between the Hall element and its output value is linearly shown is larger.

  The required moving range of the movable part is determined by the size of the image sensor and the length of the focal length of the photographing lens. For example, in the case of using a 2/3 inch imaging device and a photographic lens having a focal length of 400 mm in 35 mm format conversion, the moving range (correction range) of the movable part needs to be ± 0.7 mm. That is, if d is set to 1.0 mm or more, the value of dd can be set to ± 0.7 mm or more, and a highly accurate position using a linear change amount over the entire moving range of the movable part required. Detection can be performed.

  On the other hand, when a 4/3 inch imaging device is used within the same ± 0.7 mm moving range (correction range), the focal length of the photographic lens in 35 mm format conversion that can be corrected is 200 mm or less. . Therefore, when using a photographic lens having a focal length longer than 200 mm in terms of a 35 mm format with a 4/3 inch imaging device, a moving range larger than ± 0.7 mm is required.

  However, a space between the first horizontal position detection / drive magnet 411b1 and the second horizontal position detection / drive magnet 411b2 is generated, so that the first and second horizontal position detection / drive magnets 411b1, 411b2 are generated. And the magnetic flux density between the horizontal hall elements hh10 decreases. Therefore, in order to make the maximum value and the minimum value of the first detection position signal px equal when the value of d is large (2) and when the value of d is small (1), the gain of the first detection position signal px Do up. When the value of d is large and the gain is not increased (3) is indicated by a dotted line. The gain increase performs at least one of a voltage increase for increasing the value of the first constant voltage XVf applied between the input terminals of the horizontal hall element hh10 from the horizontal input circuit 456 and a potential difference amplification for amplifying the horizontal potential difference x10. The horizontal potential difference x10 is amplified by increasing the amplification factor in the horizontal differential amplifier circuit 451 and the horizontal subtraction amplifier circuit 453. For example, the resistance values of the second and fourth horizontal resistances R8 and R10 are made larger than the resistance values of the first and third horizontal resistances R7 and R9 (increase in the first amplification factor).

  In the horizontal direction differential amplifier circuit 451, the gain can be increased by increasing the amplification factor at the stage of amplifying the signal difference between the output terminals of the horizontal direction hall element hh10.

  The effect of arranging the first spacer 411bm between the first and second horizontal position detecting and driving magnets 411b1 and 411b2 is that the first and second vertical position detecting and driving magnets 412b1 and 412b2 are The effect is similar to that of arranging the second spacer 412bm. The gain of the second detection position signal py is increased by increasing the voltage of the second constant voltage YVf applied between the input terminals of the vertical hall element hv10 from the vertical input circuit 466, or by increasing the potential difference of the vertical potential y10. At least one of the amplifications is performed. Amplification of the vertical potential difference y10 is performed by increasing the amplification factor in the vertical differential amplifier circuit 461 and the vertical subtraction amplifier circuit 463. For example, the resistance values of the second and fourth vertical resistances R28 and R30 are made larger than the resistance values of the first and third vertical resistances R27 and R29 (increase in the second amplification factor).

  The gain in the vertical differential amplifier circuit 461 can also be increased by increasing the gain at the stage of amplifying the signal difference between the output terminals of the vertical hall element hv10.

  Next, the procedure of image blur correction processing performed independently of other operations as interrupt processing at regular time intervals (1 ms) will be described with reference to the flowchart of FIG.

  When the image blur correction process interrupt operation starts in step S11, the first and second angular velocities vx and vy output from the angular velocity detection unit 25 in step S12 are converted to A via the A / D0 and A / D1 of the CPU 21, respectively. / D converted and input. In step S13, the first and second detected position signals px and py detected by the Hall element unit 44a and calculated by the Hall element signal processing circuit unit 45 are A / D via A / D2 and A / D3 of the CPU 21. The current position P (pdx, pdy) is obtained after being converted and input.

  In step S14, it is determined whether IS = 0. When IS = 0, that is, when the correction mode is not set, in step S15, the position S (sx, sy) to which the movable part 30a should move is set to be the same as the movement center position of the movable part 30a. In the case of IS = 1, that is, in the correction mode, in step S16, the position S (sx, sy) to which the movable part 30a should move is calculated and set from the first and second angular velocities vx, vy obtained in step S12.

  In step S17, the driving force D required to move the movable portion 30a from the position S (sx, sy) and the current position P (pdx, pdy) set in step S15 or step S16, that is, the first and second driving coils 31a. , 32a required to drive the first and second PWM duties dx, dy are calculated. In step S18, the first and second drive coils 31a and 32a are driven by the first and second PWM duties dx and dy via the driver circuit 29, and the movable portion 30a is moved. The operations in steps S17 and S18 are automatic control calculations used in PID automatic control that performs general proportional, integral, and differential calculations.

  In the present embodiment, the configuration in which the position detecting magnet and the driving magnet are shared in each of the first direction x and the second direction y has been described.

  Further, the position detecting hall element 44a is connected to the movable portion 30a, and position detecting magnets (first and second horizontal position detecting and driving magnets 411b1, 411b2, first and second vertical position detecting and driving). The configuration in which the magnets 412b1, 412b2) are disposed on the fixed portion 30b has been described. However, the configurations of the movable portion 30a and the fixed portion 30b are reversed, that is, the movable portion 30a is a position detection magnet, and the fixed portion 30b is a Hall element. The form which has a part may be sufficient.

  Also, any magnet as a device that generates a magnetic field is a permanent magnet that always generates a magnetic field.

  In addition, the imaging unit 39a including the imaging element 39a1 has been described as being arranged and moved on the movable unit 30a. However, the imaging unit 39a is fixed, and the same applies to the configuration in which the image blur correction lens is arranged and moved on the movable unit 30a. The effect is obtained.

  Further, although the position detection using the Hall element has been described as the magnetic field change detection element, another detection element may be used as the magnetic field change detection element. Specifically, an MI sensor (high frequency carrier type magnetic field sensor), a magnetic resonance type magnetic field detection element, an MR element (magnetoresistance effect element) capable of obtaining position detection information of the movable part by detecting a change in the magnetic field. ). These can obtain the same effects as those of the present embodiment using Hall elements.

  In the present embodiment, the position detection of the movable portion 30a of the image blur correction apparatus has been described. However, the position of a movable body other than the image blur correction apparatus that performs position detection using a magnetic field change detection element such as a Hall element. Even if it is a detection apparatus, the same effect as this embodiment is acquired.

  Further, in the present embodiment, the case where two-dimensional position detection is performed has been described, but the same effect as in the present embodiment can be obtained even with one-dimensional position detection.

It is the perspective view seen from the back which shows the appearance of the imaging device in this embodiment. It is a front view of an imaging device. It is a circuit block diagram of an imaging device. It is a block diagram of an image blur correction part. It is a block diagram of the cross section in the AA of FIG. It is a perspective view which shows the structure of a 1st, 2nd horizontal direction position detection and a drive magnet. FIG. 7 is a perspective view showing a configuration of first and second horizontal position detection and drive magnets in a form different from FIG. 6. It is a circuit block diagram of a Hall element part and a Hall element signal processing circuit part. It is a graph which shows the relationship between the position of a horizontal direction Hall element, and a 1st detection position signal. It is a flowchart of an image blur correction process performed as an interrupt process at regular intervals.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Imaging device 11 Pon button 12a Metering switch 13 Release button 13a Release switch 14 Image blur correction button 14a Image blur correction switch 17 LCD monitor 21 CPU
22 imaging block 23 AE unit 24 AF unit 25 angular velocity detection unit 26, 27 first and second angular velocity sensor 28 amplifier / high pass filter circuit 29 driver circuit 30 image blur correction unit 30a movable unit 30b fixed unit 31a, 32a first, first 2 Driving coil 39a Imaging unit 39a1 Imaging element 39a2 Stage 39a3 Holding unit 39a4 Optical low-pass filter 410b Position detection and driving magnet unit 411b1, 411b2 First and second horizontal position detection and driving magnets 412b1, 412b2 First, first 2 Vertical position detection and drive magnets 411bm, 412bm First and second spacers 431b, 432b First and second position detection and drive yokes 44a Hall element section 45 Hall element signal processing circuit section 451 Horizontal direction differential amplifier circuit 453 Horizontal subtraction Amplifier circuit 456 Horizontal direction input circuit 461 Vertical direction differential amplifier circuit 463 Vertical direction subtraction amplifier circuit 466 Vertical direction input circuit 49a Movable substrate 64a Plate 65b Base plate 67 Shooting lens dx, dy First and second PWM duty hh10 Horizontal direction Hall element hv10 Vertical Hall element L1, L2 First and second effective length LX Optical axis of photographing lens px, py First and second detection position signals

Claims (11)

A movable part having either one of an image sensor or an image blur correction lens, movable in a first direction orthogonal to the optical axis of the photographing lens, and in a second direction orthogonal to the optical axis and the first direction;
A fixed portion that movably supports the movable portion in the first and second directions;
Either the movable part or the fixed part includes a horizontal magnetic field change detection element used for detecting the position of the movable part in the first direction and a vertical direction used for detecting the position of the movable part in the second direction. A magnetic field change detection unit having a magnetic field change detection element;
The other of the movable part and the fixed part has a position detection magnet part used for position detection in the first and second directions of the movable part at a position facing the magnetic field change detection part,
The position detecting magnet section includes a first horizontal position detecting magnet in which N poles and S poles are arranged in a third direction parallel to the optical axis, and S poles and N poles in the third direction. Are arranged in the first horizontal direction in the first direction at a position facing the horizontal magnetic field change detection element and the second horizontal position detection magnet. A first vertical direction position detecting magnet in which the south poles of the direction position detecting magnets are arranged and used for position detection in the first direction, and the north and south poles are arranged in the third direction; A second vertical position detecting magnet in which an S pole and an N pole are arranged in the third direction, and the first vertical position in the second direction at a position facing the vertical magnetic field change detecting element; The north pole of the detection magnet and the south pole of the second vertical position detection magnet are arranged side by side. Is used for position detection of the second direction,
The image blur correction apparatus, wherein the first and second horizontal position detection magnets and the first and second vertical position detection magnets are arranged at a predetermined interval.   The position detecting magnet section includes a first spacer made of a non-magnetic material in the space of the predetermined interval between the first and second horizontal position detecting magnets, and the first and second vertical 2. The image blur correction device according to claim 1, further comprising a second spacer made of a non-magnetic material in the space of the predetermined interval between the direction position detection magnets.   When the optical axis is in a positional relationship passing near the center of one of the image sensor and the image blur correction lens, the position of the horizontal magnetic field change detecting element in the first direction is the first and second horizontal positions. The position in the second direction of the vertical magnetic field change detecting element is in the vicinity of the same distance from the first and second vertical position detection magnets. The image blur correction apparatus according to claim 1.   Compared to the case where the distance between the first and second horizontal position detection magnets and the first and second vertical position detection magnets are not apart from each other by a predetermined distance, the horizontal magnetic field change detection element, A voltage increase that increases a voltage value applied between input terminals of each of the vertical magnetic field change detection elements, or a horizontal potential difference between output terminals of the horizontal magnetic field change detection elements is amplified by a first amplification factor, and 2. The image blur correction device according to claim 1, wherein at least one of potential difference amplification for amplifying a vertical potential difference between output terminals of the vertical magnetic field change detecting element with a second amplification factor is performed.   A horizontal subtraction amplification circuit for obtaining a first detection position signal for specifying a position of the movable portion in the first direction by an operation including amplification of the first amplification factor in the horizontal potential difference; and a second amplification factor in the vertical potential difference. A magnetic field change detection element signal processing circuit unit having a vertical direction subtraction amplification circuit that obtains a second detection position signal that specifies a position of the movable unit in the second direction by an operation including amplification of 5. An image blur correction apparatus according to 4.   The magnetic field change detection element signal processing circuit unit includes a horizontal differential amplifier circuit that amplifies a signal difference between output terminals of the horizontal magnetic field change detection element and a signal difference between output terminals of the vertical magnetic field change detection element. A horizontal differential amplifier circuit that amplifies the horizontal potential difference from the difference between the signal difference amplified by the horizontal differential amplifier circuit and a reference voltage, and amplified by the vertical differential amplifier circuit. 6. The image blur correction device according to claim 5, wherein the vertical potential difference is obtained from a difference between the signal difference and a reference voltage. The horizontal differential amplifier circuit includes first and second horizontal operational amplifiers, the horizontal subtracting amplifier circuit includes a third horizontal operational amplifier, and an output terminal of the first horizontal operational amplifier is a first horizontal operational amplifier. The output terminal of the third horizontal operational amplifier is connected to the inverting input terminal of the third horizontal operational amplifier via the second horizontal resistance. The output terminal of the second horizontal operational amplifier is connected to the non-inverting input terminal of the third horizontal operational amplifier via a third horizontal resistor, and the non-inverting input terminal of the third horizontal operational amplifier is the fourth horizontal direction. The first and third horizontal resistances have the same resistance value, the second and fourth horizontal resistances have the same resistance value, and the first and third horizontal resistances. Increasing the value of the first amplification factor by a value greater than,
The vertical differential amplifier circuit includes first and second vertical operational amplifiers, the vertical subtracting amplifier circuit includes a third vertical operational amplifier, and an output terminal of the first vertical operational amplifier is a first vertical operational amplifier. The output terminal of the third vertical operational amplifier is connected to the inverting input terminal of the third vertical operational amplifier via the second vertical resistance. The output terminal of the second vertical operational amplifier is connected to the non-inverting input terminal of the third vertical operational amplifier via a third vertical resistance, and the non-inverting input terminal of the third vertical operational amplifier is the fourth vertical direction. The first and third vertical resistances have the same resistance value, the second and fourth vertical resistances have the same resistance value, and the first and third vertical resistances. An image blur correction device according to claim 6, characterized in that to increase the value of the second gain by a value greater than. The movable part has the magnetic field change detection part,
The fixed portion has the position detecting magnet portion at a position facing the magnetic field change detecting portion,
The image blur correction apparatus according to claim 1, wherein the magnetic field change detection unit includes one horizontal magnetic field change detection element and one vertical magnetic field change detection element.   The first and second horizontal position detecting magnets and the first and second vertical position detecting magnets are also used for movement of the movable part in first and second directions. The image blur correction device according to claim 8. The magnetic field change detection unit is a uniaxial Hall element,
9. The image blur correction apparatus according to claim 8, wherein both the horizontal magnetic field change detection element and the vertical magnetic field change detection element are Hall elements. A movable part movable in a first direction;
A fixed portion that movably supports the movable portion in the first direction;
Either the movable part or the fixed part has a magnetic field change detection part having a magnetic field change detection element used for position detection in the first direction of the movable part,
The other of the movable part and the fixed part has a position detection magnet part used for position detection in the first direction of the movable part at a position facing the magnetic field change detection part,
The position detecting magnet section includes a first position detecting magnet in which a north pole and a south pole are arranged in a direction perpendicular to the first direction, and a south pole and a north in a direction perpendicular to the first direction. A second position detecting magnet on which poles are arranged, and an N pole of the first position detecting magnet and an S of the second position detecting magnet in the first direction at a position facing the magnetic field change detecting element. The poles are aligned and used for position detection in the first direction,
The first and second position detection magnets are arranged at a predetermined interval, and the magnetic field change detection is performed as compared with the case where the first and second position detection magnets are not separated from each other. Performing at least one of a voltage increase for increasing a voltage value applied between the input terminals of the element or a potential difference amplification for amplifying a potential difference between the output terminals of the magnetic field change detecting element with a first amplification factor;
A magnetic field change detection element signal processing circuit unit having a generation circuit for obtaining a detection position signal for specifying a position in the first direction of the movable part by an operation including amplification of the first amplification factor in the potential difference is provided. A movable body position detection device.

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