JP2005292797A - Image blurring correcting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for properly performing position detection which uses a magnetic field change detection element of an image blurring correcting device, in response to modification of the length of a focal length. <P>SOLUTION: The image blurring correcting device comprises a Hall element signal processing circuit part for outputting a second detection position signal specifying a second directional position for position detection of a mobile part from an output signal of a vertical Hall element, by outputting a first detection position signal specifying a first directional position for position detection of the mobile part from an output signal of a horizontal Hall element. The image blurring correcting device comprises a control means for controlling a mobile part, a fixing part and a Hall element signal processing circuit part, by calculating first and second directional positions after the first and second detection position signals are input and A/D converted. The control means performs regulation, making respective output value widths of the first and second detection position signals maximum in a range capable of A/D conversion in a moving range (second horizontal moving range Rx2)of the mobile part proportional to the focal length of a photographic lens. <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 magnetic field change detection element such as the Hall element as in the device of Patent Document 1, the length of the focal length is increased when a lens such as a zoom lens whose focal length varies is used. The position detection performance was not adjusted accordingly.

  Accordingly, an object of the present invention is to provide an apparatus that appropriately performs position detection using a magnetic field change detection element of an image blur correction apparatus in accordance with a change in the length of a focal length.

  An image blur correction apparatus for an image pickup apparatus according to the present invention includes a photographing lens capable of changing a focal length, and one of an image pickup element and an image blur correction lens, and a first direction orthogonal to the optical axis of the photographing lens. And a movable part movable in a second direction orthogonal to the optical axis and the first direction, and a fixed part that movably supports the movable part in the first and second directions. On the other hand, a magnetic field change detection having a horizontal magnetic field change detecting element used for detecting the position of the movable part in the first direction and a vertical magnetic field change detecting element used for detecting the position of the movable part in the second direction. And 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. Detecting the position of the movable part from the output signal of the horizontal magnetic field change detection element Therefore, the first detection position signal for specifying the position in the first direction is output, and the second detection position signal for specifying the position in the second direction for detecting the position of the movable portion is output from the output signal of the vertical magnetic field change detection element. The first and second detection position signals are input, the first and second positions of the movable part are calculated after A / D conversion, and the movable part, the fixed part, and the signal processing part are controlled. Control means, and the control means maximizes the width of the output value of each of the first and second detection position signals within a movable range of the movable portion proportional to the focal length of the photographing lens and within a range where A / D conversion is possible. Make adjustments.

  As a result, the detection resolution at the time of A / D conversion can be optimized according to the length of the focal length by adjustment by the control means.

  Preferably, in the adjustment, when the photographic lens has the first focal length, the first optimum horizontal magnetic field change detection element current value to be supplied to the input terminal of the horizontal magnetic field change detection element at the time of detecting the position of the movable portion is set in the horizontal direction. First initial adjustment obtained by changing the value of the current flowing through the input terminal of the magnetic field change detection element to increase the first detection resolution when the first detection position signal is A / D converted, and the photographic lens has the first focus The first optimum vertical magnetic field change detecting element current value flowing to the input terminal of the vertical magnetic field change detecting element when the position of the movable part is detected, and the current value flowing through the input terminal of the vertical magnetic field change detecting element when the position of the movable part is detected. A second initial adjustment obtained by increasing the second detection resolution when the second detection position signal is A / D converted and the first optimum horizontal direction magnetic field change detecting element current value, the first optimum vertical direction magnetism. Each change detection element current value is multiplied by a predetermined coefficient, and the second optimum horizontal magnetic field change detection element current when the photographic lens has the second focal length that includes the first focal length and is changed by the user's operation. And an adjustment relating to the focal length for calculating the second optimum vertical magnetic field change detecting element current value.

  As a result, the detection resolution at the time of A / D conversion is increased by changing the value of the current flowing through the input terminal of each of the horizontal direction magnetic field change detection element and the vertical direction magnetic field change detection element, and is obtained by the first and second initial adjustments. From the obtained first optimum horizontal magnetic field change detection element current value and first optimum vertical magnetic field change detection element current value, the detection resolution at the time of A / D conversion is easily optimized according to the focal length. It becomes possible to do.

  More preferably, in the first initial adjustment, the movable portion is at one end point in the first direction within the movement range when the photographing lens has the first focal length, and the output value of the first detection position signal is A / D. The first horizontal magnetic field change detecting element current value that flows through the input terminal of the horizontal magnetic field change detecting element when the conversion is maximum, and the movement when the movable lens is at the first focal length The second flowing at the input terminal of the horizontal direction magnetic field change detection element when the output value of the first detection position signal is the minimum within the range where A / D conversion is possible at the other end point in the first direction within the range. The horizontal direction magnetic field change detecting element current value is obtained, and the smaller one of the first and second horizontal direction magnetic field change detecting element current values is set as the first optimum horizontal direction magnetic field change detecting element current value. The movable range is the moving range when the taking lens is the first focal length. The first vertical direction that flows through the input terminal of the vertical direction magnetic field change detection element when the output value of the second detection position signal is at the maximum within the range in which A / D conversion is possible. The A / D conversion is performed on the output value of the second detection position signal when the magnetic field change detection element current value and the movable part are at the other end point in the second direction within the moving range when the photographing lens has the first focal length. The second vertical magnetic field change detection element current value flowing through the input terminal of the vertical magnetic field change detection element when the minimum is within the possible range is obtained, and the first and second vertical magnetic field change detection element current values are obtained. The smaller value is set as the first optimum vertical magnetic field change detecting element current value.

  This makes it possible to easily obtain the first optimum horizontal magnetic field change detection element current value and the first vertical magnetic field change detection element current value.

  More preferably, the first focal length is the longest focal length in the photographic lens, and the predetermined coefficient is based on a ratio of values of the first and second focal lengths. Thereby, it becomes possible to optimize the detection resolution at the time of A / D conversion according to the length of the focal length simply from the ratio of the lengths of the two focal lengths. Also, by setting the first focal length to the telephoto end of the photographic lens, the photographic lens is the length of the focal length based on the results of the first and second initial adjustments when the photographic lens is the first focal length. Accordingly, it is possible to make it difficult to cause an error in optimizing the detection resolution.

  Preferably, the movable part has a magnetic field change detection part, the fixed part has a position detecting magnet part, and the magnetic field change detection part has one horizontal magnetic field change detection element and one vertical magnetic field change detection element. The position detecting magnet unit is attached to a position facing the horizontal magnetic field change detecting element and used for position detection in the first direction; a vertical magnetic field change detecting element; And a second position detection magnet that is attached to the opposite position and is used for position detection in the second direction.

  More preferably, the movable part includes a first drive coil used for moving the movable part in the first direction and a second drive coil used for moving the movable part in the second direction. The first position detection magnet is also used to move the movable part in the first direction, and the second position detection magnet is also used to move the movable part in the second direction. Thereby, it becomes possible to share the position detecting magnet part of the movable part and use it for driving the movable part.

  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.

  Preferably, the first optimum horizontal direction magnetic field change detecting element current value and the first optimum vertical direction magnetic field change detecting element current value are connected to the control means, and the contents are erased even when the power is turned off. A memory unit that is not used. Thus, once the first optimum horizontal magnetic field change detecting element current value and the first optimum vertical magnetic field change detecting element current value are set, the first and second initial adjustments are performed again even after the power is turned off. Without performing this, the control means can read out the first optimum horizontal magnetic field change detecting element current value and the first optimum vertical magnetic field change detecting element current value.

  In addition, another image blur correction device of the imaging apparatus according to the present invention includes a photographic lens capable of changing a focal length, and either an image sensor or an image blur correction lens, and is orthogonal to the optical axis of the photographic lens. A movable part movable on the plane and a fixed part that movably supports the movable part on the plane, and either the movable part or the fixed part is a magnetic field change used for detecting the position of the movable part. A signal processing unit that has a detection unit and outputs a detection position signal for specifying the position for detecting the position of the movable unit from the output signal of the magnetic field change detection unit; and And a control means for adjusting the output value.

  As described above, according to the present invention, it is possible to provide an apparatus that appropriately performs position detection using a magnetic field change detection element of an image blur correction apparatus according to a change in the length of a focal length.

  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 a Pon button 11 that switches power on and off, a release button 13, a display unit 17 such as an LCD, a CPU 21, an imaging block 22, an AE unit 23, an AF unit 24, and an image blur correction unit 30. The imaging unit 39 a and the imaging lens 67 are included. 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 via the photographing lens 67 by the imaging block 22 that drives the imaging unit 39a, and the image captured by the display unit 17 is displayed. The subject image can also be optically observed with an optical viewfinder (not shown).

  When the release button 13 is pressed halfway, the photometry SW 12a is turned on to perform photometry, distance measurement, and focusing operation. When the release button 13 is fully pressed, the release SW 13a is turned on to perform imaging, and the captured image is stored in the memory. Is done.

  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 image blur correction device, that is, the image blur correction portion of the image pickup apparatus 1 includes 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. , An adjustment terminal 71, and a memory unit 72.

  When the image blur correction button 14 is pressed, the image blur correction SW 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. Image blur correction. The parameter IS = 1 is set when the image blur correction SW 14a is turned on, and the parameter IS = 0 is set when the image blur correction SW 14a is not in the correction mode 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 SW 12a, the release SW 13a, and the image blur correction SW 14a is input to each of the ports P12, P13, and P14 of the CPU 21 as a 1-bit digital signal. The imaging block 22, the AE unit 23, and the AF unit 24 input and output signals at ports P3, P4, and P5, respectively.

  The taking lens 67 is a lens whose focal length can be changed, such as a zoom lens. In the present embodiment, the imaging lens 67 uses the longest focal length of the photographic lens 67 as the first focal length F1, and includes the first focal length F1 and the focal length changed by the user's operation as the second focal length. This will be described as F2. The value of the first focal length F1 is used for first and second initial adjustments described later. Information regarding the value of the second focal length F2 is input from the photographing lens 67 to the port P7 of the CPU 21 via a lens position detection device (not shown) such as a code plate or an encoder.

  Note that the length of the first focal length F1 is set to the telephoto end of the photographic lens 67 based on the results of the first and second initial adjustments when the photographic lens 67 is the first focal length F1. This is because an error is hardly caused in optimizing the detection resolution in accordance with the length of the distance.

  The adjustment terminal 71 is used to increase detection resolution when A / D converting the first and second detection position signals px and py of the analog signals related to position detection in position detection using the Hall element unit 44a described later. A switch for determining whether or not to enter an adjustment mode for initial adjustment. When the switch is turned on, the adjustment mode is entered. When the switch is turned off, the adjustment mode is canceled and the normal imaging mode is entered. The memory unit 72 can electrically rewrite the first optimum horizontal hall element current value xsDi1 and the first optimum vertical hall element current value ysDi1 obtained in the adjustment mode, and the contents can be stored even when the power is turned off. Is a non-volatile memory such as an EEPROM which is not erased. The adjustment terminal 71 performs input / output at the port P15 of the CPU 21 and performs initial adjustment when the Lo signal is output to the port P15. The memory unit 72 inputs and outputs signals at the port P6.

  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 according 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 two first and second position detection and drive magnets 411b and 412b, first and second position detection and drive yokes 431b and 432b, and first to fourth vertical movements as position detection magnet portions. Bearing portions 54b to 57b and a base plate 65b.

  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.

  An appropriate range of movement of the movable portion 30a in the first direction x and the second direction y varies depending on the length of the focal length. As shown in FIG. 6, when the focal length of the photographic lens 67 is the first focal length F1, the moving range of the movable portion 30a in the first direction x is set to the first horizontal moving range Rx1, and the moving in the second direction y. The range is set to the first vertical movement range Ry1. The first horizontal movement range Rx1 is the maximum range in which the movable part 30a can move in the first direction x, and the first vertical movement range Ry1 is the maximum range in which the movable part 30a can move in the second direction y. . The moving range of the movable part 30a here is a range in which the central point of the movable part 30a can move. In FIG. 6, the shapes of the movable portion 30a and the fixed portion 30b are simplified.

  When the focal length of the photographic lens 67 is the second focal length F2, the moving range in the first direction x of the movable part 30a is set to the second horizontal moving range Rx2, and the moving range in the second direction y is the second vertical range. The direction movement range Ry2 is set. The second horizontal movement range Rx2 is a range that varies in proportion to the length of the focal length that is changed by the user's operation that maximizes the first horizontal movement range Rx1, and the second vertical movement range Ry2 is This is a range that varies in proportion to the length of the focal length that is changed by the user's operation that maximizes the first vertical movement range Ry1.

  The image blur angle is usually within a range of about ± 0.7 °, and the values of the second horizontal movement range Rx2 and the second vertical movement range Ry2 are the value of the second focal length F2 and 2 × tan ( 0.7 °).

  One end point of the first horizontal movement range Rx1 is rx11, the other end point is rx12, one end point of the first vertical movement range Ry1 is ry11, the other end point is ry12, and the second horizontal movement range Rx2 One end point is rx21, the other end point is rx22, one end point of the second vertical movement range Ry2 is ry21, and the other end point is ry22.

  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 position detection and drive magnet 411b is 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 second position detection and drive magnet 412b is 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 position detection and drive magnet 411b is on the base plate 65b of the fixed portion 30b and the first position detection and drive yoke 431b attached to the movable portion 30a side in the third direction z. N pole and S pole are mounted side by side in one direction x. The length of the first position detection and drive magnet 411b in the second direction y is such that the magnetic field exerted on the first drive coil 31a and the horizontal hall element hh10 does not change when the movable portion 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.

  The second position detection and drive magnet 412b is on the base plate 65b of the fixed portion 30b and the second position detection and drive yoke 432b attached to the movable portion 30a side in the third direction z. N pole and S pole are mounted side by side in two directions y. The length of the second position detection and drive magnet 412b in the first direction x does not change the magnetic field exerted on the second drive coil 32a and the vertical hall element hv10 when the movable part 30a moves in the first direction x. The second driving coil 32a is set to be longer than the second effective length L2 in the first direction x.

  The first position detecting / driving yoke 431b is formed of a polygonal soft magnetic material having a U-shape when viewed from the second direction y, and the first position detecting / driving magnet 411b, first driving The coil 31a and the horizontal hall element hh10 are mounted on the base plate 65b of the fixed portion 30b so as to sandwich the coil 31a and the horizontal hall element hh10 in the third direction z. The portion of the first position detection and drive yoke 431b on the side in contact with the first position detection and drive magnet 411b serves to prevent the magnetic field of the first position detection and drive magnet 411b from leaking to the surroundings. The first position detection and drive magnet 411b, the first drive coil 31a, and the portion facing the movable substrate 49a in the first position detection and drive yoke 431b are the same as the first position detection and drive magnet 411b. The first driving coil 31a and the first position detection and driving magnet 411b serve to increase the magnetic flux density between the horizontal hall element hh10.

  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 second position detection and drive magnet 412b and second drive The 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 between the third direction z. The portion of the second position detection and drive yoke 432b on the side in contact with the second position detection and drive magnet 412b serves to prevent the magnetic field of the second position detection and drive magnet 412b from leaking to the surroundings. The second position detection and drive magnet 412b, the second drive coil 32a, and the portion facing the movable substrate 49a in the second position detection and drive yoke 432b are connected to the second position detection and drive magnet 412b and the second magnet. The second driving coil 32a and the second position detection and driving magnet 412b serve to increase the magnetic flux density between the vertical hall element hv10.

  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 mounted on the movable substrate 49a of the movable part 30a as viewed from the third direction z and at a position facing the first position detection and driving magnet 411b of the fixed part 30b. The vertical hall element hv10 is mounted on the movable substrate 49a of the movable part 30a as viewed from the third direction z and at a position facing the second position detection and drive magnet 412b of the fixed part 30b.

  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 drive coils 31a and 32a and the hall element portion 44a are on the opposite side of the movable substrate 49a from the side where the photographing lens 67 is located, and the first and second position detection and drive magnets 411b and 412b are The base plate 65b is disposed on the side where the photographing lens 67 is present.

  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.

  In the first and second initial adjustments, when the photographic lens 67 has the first focal length F1, the first and second detection position signals px and py output from the Hall element signal processing circuit unit 45 are respectively stored in the CPU 21. When A / D conversion is performed via A / D2 and A / D3, the first detection resolution and the second detection resolution are increased, that is, within the movement range of the movable portion 30a (first horizontal movement range Rx1, The width of the output value of each of the first and second detection position signals px and py is maximized within a range in which the CPU 21 can perform A / D conversion within one vertical direction movement range Ry1).

  With the first initial adjustment, the current value (first optimum horizontal hall element current value xsDi1) that flows through the input terminal of the horizontal hall element hh10 in position detection when the focal length of the photographic lens 67 is equal to the first focal distance F1 is obtained. Desired. By the second initial adjustment, the current value (first optimum vertical hall element current value ysDi1) that flows through the input terminal of the vertical hall element hv10 in the position detection when the focal length of the photographic lens 67 is equal to the first focal distance F1 is obtained. Desired.

  The current value (second optimum horizontal hall element current value xsDi2) passed through the input terminal of the horizontal hall element hh10 during position detection when the photographing lens 67 has the second focal length F2 was obtained by the first initial adjustment. It is obtained by multiplying the first optimal horizontal hall element current value xsDi1 by a predetermined coefficient calculated from the values of the first and second focal lengths F1 and F2. The current value (second optimum vertical hall element current value ysDi2) flowing through the input terminal of the vertical hall element hv10 is the first and second focal points corresponding to the first optimum horizontal hall element current value ysDi1 obtained in the second initial adjustment. It is obtained by multiplying a predetermined coefficient calculated from the values of the distances F1 and F2.

  In the present embodiment, the second optimum horizontal hall element current value xsDi2 and the second optimum vertical hall element current value ysDi2 are obtained from the first optimum horizontal hall element current value xsDi1 and the first optimum vertical hall element current value ysDi1. Is a procedure for calculating the focal length.

  The first and second initial adjustments are performed in the adjustment mode when the Lo signal is output from the adjustment terminal 71 to the CPU 21. Adjustment related to the focal length is performed as needed in the normal imaging mode in which the adjustment mode is canceled.

  The current values flowing through the input terminals of the horizontal hall element hh10 and the vertical hall element hv10 are defined as a second optimum horizontal hall element current value xsDi2 and a second optimum vertical hall element current value ysDi2. As a result, the first and second detection position signals px and py output from the Hall element signal processing circuit unit 45 are subjected to A / D conversion via the A / D2 and A / D3 of the CPU 21, respectively. The second detection resolution and the second detection resolution are optimized according to the length of the focal length. That is, the first and second detection position signals px and py are output within the range of movement of the movable part 30a (second horizontal direction movement range Rx2, second vertical direction movement range Ry2) and within the range where the CPU 21 can perform A / D conversion. The value width is maximized.

  Specifically, in the first initial adjustment, the movable portion 30a is at one end point rx11 of the first horizontal movement range Rx1, and the output value of the first detection position signal px is a range in which the CPU 21 can perform A / D conversion. The first horizontal hall element current value xDi1 flowing through the input terminal of the horizontal hall element hh10 when the maximum (MAX) value is reached, and the movable portion 30a are at the other end point rx12 of the first horizontal movement range Rx1. Thus, the second horizontal hall element current flowing in the input terminal of the horizontal hall element hh10 when the output value of the first detection position signal px becomes the minimum (MIN) value within the range in which the CPU 21 can perform A / D conversion. The value xDi2 is obtained, and the smaller one of the first and second horizontal hall element current values xDi1 and xDi2 is recorded in the memory unit 72 as the first optimum horizontal hall element current value xsDi1. To.

  In the second initial adjustment, the movable portion 30a is at one end point ry11 of the first vertical movement range Ry1, and the output value of the second detection position signal py is the maximum within the range in which the CPU 21 can perform A / D conversion ( MAX) value, the first vertical hall element current value yDi1 flowing through the input terminal of the vertical hall element hv10 and the movable portion 30a are at the other end point ry12 of the first vertical movement range Ry1, and the second A second vertical hall element current value yDi2 flowing through the input terminal of the vertical hall element hv10 when the output value of the detection position signal py becomes the minimum (MIN) value within the range in which the CPU 21 can perform A / D conversion is obtained. The smaller one of the first and second vertical hall element current values yDi1 and yDi2 is recorded in the memory unit 72 as the first optimum vertical hall element current value ysDi1.

  The first hall element signal processing circuit 450 receives the horizontal voltage XVf corresponding to the second optimum horizontal current value xsDi2 from the D / A0 of the CPU 21. The second hall element signal processing circuit 460 receives the vertical voltage YVf corresponding to the second optimum vertical current value ysDi2 from the D / A1 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 101st circuit 451 and a 103rd circuit 453, and the input section has a 106th circuit 456. The output section of the vertical hall element hv10 in the second hall element signal processing circuit 460 has a 111th circuit 461 and a 113th circuit 463, and the input section has a 116th circuit 466.

  The output terminal of the horizontal hall element hh10 is connected to the 101st circuit 451, and the 101st circuit 451 is connected to the 103rd circuit 453. The 101st circuit 451 is a differential amplifier circuit that amplifies the signal difference between the output terminals of the horizontal hall element hh10. The 103rd 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 multiplies it by a constant first amplification factor AA1. The subtracting amplifier circuit for obtaining the first detection position signal px.

  The 101st circuit 451 includes 101st to 103rd resistors R101 to R103, 101st and 102nd operational amplifiers A101 and A102. One of the output terminals of the horizontal hall element hh10 is connected to the non-inverting input terminal of the 101st operational amplifier A101, and the other terminal is connected to the non-inverting input terminal of the 102nd operational amplifier A102. The inverting input terminal of the 101st operational amplifier A101 is connected to the 101st and 102nd resistors R101 and R102, and the inverting input terminal of the 102nd operational amplifier A102 is connected to the 101st and 103rd resistors R101 and R103. The output terminal of the 101st operational amplifier A101 is connected to the 102nd resistor R102 and the 107th resistor R107 of the 103rd circuit 453. The output terminal of the 102nd operational amplifier A102 is connected to the 103rd resistor R103 and the 109th resistor R109 of the 103rd circuit 453.

  The 103rd circuit 453 includes 107th to 110th resistors R107 to R110 and a 105th operational amplifier A105. The inverting input terminal of the 105th operational amplifier A105 is connected to the 107th resistor R107 and the 108th resistor R108, the non-inverting input terminal is connected to the 109th resistor R109 and the 110th resistor R110, and the output terminal is connected to the 108th resistor R108. A first detection position signal px obtained by multiplying the horizontal potential difference x10 by a constant first amplification factor AA1 is output. One terminal of the 110th resistor R110 is connected to the power source of the reference voltage Vref.

  The 102nd and 103rd resistors R102 and R103 are set to the same resistance value, the 107th and 109th resistors R107 and R109 are set to the same resistance value, and the 108th and 110th resistors R108 and R110 are set to the same resistance value. The value of the first amplification factor AA1 is calculated from the ratio of the resistance values of the 108th resistor R108 and the 107th resistor R107.

  The 106th circuit 456 includes a 119th resistor R119 and a 108th operational amplifier A108. The inverting input terminal of the 108th operational amplifier A108 is connected to one of the 119 resistor R119 and the input terminal of the horizontal hall element hh10. The potential at the non-inverting input terminal of the 108th operational amplifier A108 is set to the horizontal voltage XVf corresponding to the current value (second optimal horizontal hall element current value xsDi2) at the input terminal of the horizontal hall element hh10. The value of the horizontal voltage XVf is obtained by multiplying the second optimum horizontal hall element current value xsDi2 by the resistance value of the 119 resistor R119. Therefore, the value of the horizontal voltage XVf is a function of the focal length of the photographing lens 67. The output terminal of the 108th operational amplifier A108 is connected to one input terminal of the horizontal hall element hh10. One terminal of the 119th resistor R119 is grounded.

  The output terminal of the vertical hall element hv10 is connected to the 111th circuit 461, and the 111th circuit 461 is connected to the 113th circuit 463. The 111th circuit 461 is a differential amplifier circuit that amplifies the signal difference between the output terminals of the vertical hall element hv10. The 113th circuit 463 obtains the vertical potential difference y10 (Hall output voltage) between the output terminals of the vertical Hall element hv10 from the difference between the amplified signal difference and the reference voltage Vref, and multiplies it by a constant second amplification factor AA2. The subtracting amplifier circuit for obtaining the second detection position signal py.

  The 111th circuit 461 includes 121st to 123rd resistors R121 to R123, 121st and 122nd operational amplifiers A121 and A122. One output terminal of the vertical hall element hv10 is connected to the non-inverting input terminal of the 121st operational amplifier A121, and the other terminal is connected to the non-inverting input terminal of the 122th operational amplifier A122. The inverting input terminal of the 121st operational amplifier A121 is connected to the 121st and 122nd resistors R121 and R122, and the inverting input terminal of the 122th operational amplifier A122 is connected to the 121st and 123rd resistors R121 and R123. The output terminal of the 121st operational amplifier A121 is connected to the 122th resistor R122 and the 127th resistor R127 of the 113th circuit 463. The output terminal of the 122nd operational amplifier A122 is connected to the 123rd resistor R123 and the 129th resistor R129 of the 113th circuit 463.

  The 113th circuit 463 includes 127th to 130th resistors R127 to R130 and a 125th operational amplifier A125. The inverting input terminal of the 125th operational amplifier A125 is connected to the 127th resistor R127 and the 128th resistor R128, the non-inverting input terminal is connected to the 129th resistor R129 and the 130th resistor R130, and the output terminal is connected to the 128th resistor R128. Then, a second detection position signal py obtained by multiplying the vertical potential difference y10 by a constant second amplification factor AA2 is output. One terminal of the 130th resistor R130 is connected to the power source of the reference voltage Vref.

  The 122nd and 123rd resistors R122 and R123 are set to the same resistance value, the 127th and 129th resistors R127 and R129 are set to the same resistance value, and the 128th and 130th resistors R128 and R130 are set to the same resistance value. The value of the second amplification factor AA2 is calculated from the ratio of the resistance values of the 128th resistor R128 and the 127th resistor R127.

  The 116th circuit 466 includes a 139 resistor R139 and a 128th operational amplifier A128. The inverting input terminal of the 128th operational amplifier A128 is connected to one of the 139 resistor R139 and the input terminal of the vertical hall element hv10. The potential of the non-inverting input terminal of the 128th operational amplifier A128 is set to the vertical voltage YVf corresponding to the current value (second optimum vertical hall element current value ysDi2) at the input terminal of the vertical hall element hv10. The value of the vertical voltage YVf is obtained by multiplying the second optimum vertical hall element current value ysDi2 by the resistance value of the 139 resistor R139. Therefore, the value of the vertical voltage YVf is a function of the focal length of the photographing lens 67. The output terminal of the 128th operational amplifier A128 is connected to one input terminal of the vertical hall element hv10. One terminal of the 139 resistor R139 is grounded.

  In the conventional technique, the first and second detection position signals px and py are input from the Hall element signal processing circuit unit 45 to the A / D2 and A / D3 of the CPU 21 and A / D converted. The first and second initial adjustments for increasing the detection resolution of 2, that is, within the moving range of the movable portion 30a (first horizontal moving range Rx1, first vertical moving range Ry1) and within the range where the CPU 21 can perform A / D conversion. Adjustment values obtained by the first and second initial adjustments that maximize the widths of the output values of the first and second detection position signals px and py (in this embodiment, the first optimum horizontal hall element current value xsDi1). , Corresponding to the first optimum vertical hall element current value ysDi1), the position is detected without optimization according to the change of the focal length.

  However, when the focal length of the photographic lens 67 is relatively short, the moving range of the movable portion 30a for image blur correction may be relatively narrow. For this reason, within the narrow movement range, it is possible to detect the position with higher accuracy when the width of the output value of each of the first and second detection position signals px and py is maximized within the range in which the CPU 21 can perform A / D conversion. become.

  In the present embodiment, the adjustment values (first optimum horizontal hall element current value xsDi1 and first optimum vertical hall element current value ysDi1) performed in the first and second initial adjustments are further set to the focal length of the photographing lens 67. Adjust to the length. That is, the first optimum horizontal hall element current value xsDi1 and the first optimum vertical hall element obtained by the first and second initial adjustments performed when the photographing lens 67 has the longest focal length (first focal length F1). The current value ysDi1 is multiplied by a predetermined coefficient, and the second optimum horizontal hall element current value xsDi2 and the second optimum vertical hall element at the second focal length F2 when the photographing lens 67 is changed by the user's operation. The current value ysDi2 is obtained.

  The horizontal voltage XVf and the vertical voltage YVf are such that the second optimum horizontal hall element current value xsDi2 and the second optimum vertical hall element current value ysDi2 flow according to the value of the second focal length F2 of the photographing lens 67. Applied.

  Thus, detection when the first and second detection position signals px and py from the Hall element signal processing circuit unit 45 are A / D converted by the A / D2 and A / D3 of the CPU 21 in accordance with the length of the focal length. It is possible to optimize the resolution. In particular, when the focal length is short, it is possible to increase the detection resolution and perform position detection with higher accuracy than when the focal length is long.

  Specifically, the first initial adjustment will be described with reference to FIGS. 8 shows that the output value of the first detection position signal px when the position of the movable portion 30a in the first direction x is at one end point rx11 of the first horizontal movement range Rx1 is the maximum that the CPU 21 can perform A / D conversion ( MAX) shows the relationship between the displacement in the first direction x of the movable portion 30a and the output value of the first detection position signal px when the value of the current flowing through the input terminal of the horizontal hall element hh10 is adjusted so as to match the MAX value. . The current value at this time is defined as a first horizontal hall element current value xDi1. Further, a line composed of a thick line and a broken line on the graph of FIG. 8 is defined as a first line pfx (1). The broken line portion of the first line pfx (1) indicates that the output value of the first detection position signal px when the position of the movable portion 30a in the first direction x is at the other end point rx12 of the first direction movement range Rx1 This indicates a state in which accurate position detection cannot be performed exceeding the minimum (MIN) value that can be A / D converted.

  FIG. 9 shows that the output value of the first detection position signal px when the position of the movable portion 30a in the first direction x is at the other end point rx12 of the first horizontal movement range Rx1 is the minimum (A / D conversion of the CPU 21). MIN) The relationship between the displacement in the first direction x of the movable portion 30a and the output value of the first detection position signal px when the value of the current flowing through the input terminal of the horizontal hall element hh10 is adjusted so as to coincide with the MIN) value. . The current value at this time is defined as a second horizontal hall element current value xDi2. At this time, the thick line on the graph of FIG. 9 is defined as the second line pfx (2). The second line pfx (2) indicates that the output value of the first detection position signal px when the position of the movable portion 30a in the first direction x is at one end point rx11 of the first horizontal movement range Rx1 is A / The maximum (MAX) value that can be D-converted is not exceeded and shows a state where accurate position detection can be performed. Therefore, accurate position detection can be performed within the first horizontal movement range Rx1.

  The first detection position signal px is a function of the first magnetic flux density B1 between the horizontal hall element hh10 and the first position detection and drive magnet 411b and the value of the current flowing through the input terminal of the horizontal hall element hh10. . The second detection position signal py is a function of the second magnetic flux density B2 between the vertical hall element hv10 and the second position detection and drive magnet 412b and the value of the current flowing through the input terminal of the vertical hall element hv10. .

  The first and second horizontal hall element current values xDi1 and xDi2 are compared, and the lower current value is defined as the first optimum horizontal current value xsDi1. 8 and 9, since the second horizontal hall element current value xDi2 is lower than the first horizontal hall element current value xDi1, the second horizontal hall element current value xDi2 is the first optimum. The horizontal current value xsDi1. The initial adjustment in the second direction y, that is, the second initial adjustment is performed in the same manner to obtain the first optimum vertical current value ysDi1 (not shown).

  The first optimum horizontal hall element current value xsDi1 and the first optimum vertical hall element current value ysDi1 obtained by the first and second initial adjustments are multiplied by a predetermined coefficient to obtain the second optimum horizontal hall element current value. xsDi2 and a second optimum vertical hall element current value ysDi2 are obtained.

  The predetermined coefficient is based on the ratio of the values of the first and second focal lengths F1 and F2. That is, the value of the second optimum horizontal hall element current value xsDi2 is multiplied by the value of the first horizontal hall element current value xsDi1 divided by the value of the first focal distance F1 by the value of the second focal distance F2. Is required. Similarly, the value of the second optimum vertical hall element current value ysDi2 is obtained by dividing the first vertical hall element current value ysDi1 by the value of the first focal distance F1 by the value of the second focal distance F2. It is obtained by multiplication.

  FIG. 10 shows the displacement of the movable portion 30a in the first direction x and the first detected position signal px when the current value flowing through the input terminal of the horizontal hall element hh10 is the second optimum horizontal hall element current value xsDi2. The relationship of output values is shown. A line composed of a broken line and a thick line on the graph of FIG. 10 is defined as a third line pfx (3). The dotted line is the same as the second line pfx (2) in FIG.

  The third line pfx (3) indicates that the output value of the first detection position signal px when the position of the movable portion 30a in the first direction x is at one end point rx21 of the second direction movement range Rx2 is the A / D of the CPU 21. The maximum (MAX) value that can be converted is not exceeded and shows a state where accurate position detection can be performed. The third line pfx (3) indicates that the output value of the first detection position signal px when the position of the movable portion 30a in the first direction x is at the other end point rx22 of the second direction movement range Rx2 is A of the CPU 21. This indicates a state in which accurate position detection can be performed without exceeding the minimum (MIN) value capable of / D conversion. Therefore, it can be said that accurate position detection can be performed in all of the second horizontal movement range Rx2.

  The third line pfx (3) indicates that the output value of the first detection position signal px when the position of the movable portion 30a in the first direction x is at one end point rx11 of the first direction movement range Rx1 is the A / D of the CPU 21. Above the maximum (MAX) value that can be converted. The third line pfx (3) indicates that the output value of the first detection position signal px when the position of the movable portion 30a in the first direction x is at the other end point rx12 of the first direction movement range Rx1 is A of the CPU 21. The minimum (MIN) value that can be / D converted is exceeded downward. However, when the photographic lens 67 has the second focal length F2, the movable portion 30a needs to move only within the second horizontal movement range Rx2, so whether or not accurate position detection outside this range can be performed. There is no need to consider.

  If the first detection position signal px matches the reference voltage Vref when the movable part 30a is at the movement center position, the values of the first and second horizontal hall element current values xDi1, xDi2 match. That is, the current value is such that the output value of the first detection position signal px when the position of the movable portion 30a in the first direction x is rx11 matches the maximum (MAX) value that can be A / D converted by the CPU 21. When flowing to the input terminal of the hall element hh10, the output value of the first detection position signal px when the position of the movable portion 30a in the first direction x is at rx12 matches the minimum (MIN) value that the CPU 21 can perform A / D conversion. To do. However, in order for the first detection position signal px to exactly match the reference voltage Vref when the movable part 30a is at the movement center position, the displacement of the mechanism of the image blur correction part 30 and the resistance of the Hall element signal processing circuit part 45 Adjustments that take into account the error of the value must be made separately. The same applies to the relationship between the second detection position signal py and the first and second vertical hall element current values yDi1 and yDi2.

  In the present embodiment, when such adjustment is performed and the movable portion 30a is at the movement center position, the first detection position signal px does not need to match the reference voltage Vref, and the first detection position signal px matches the focal length of the photographic lens 67. 2 It is possible to calculate the optimum horizontal hall element current value xsDi2, and it is not necessary to match the second detection position signal py and the reference voltage Vref, and the second optimum vertical hall in accordance with the focal length of the photographing lens 67. It is possible to calculate the element current value ysDi2.

  In the present embodiment, the initial value of changing the output values of the first and second detection position signals px and py by changing the value of the current flowing between the input terminals of the horizontal hall element hh10 and the vertical hall element hv10. Although the adjustment has been described, other methods may be used. The values of the first and second detection position signals px and py can also be changed by changing the values of the first and second magnetic flux densities B1 and B2 and the first and second amplification factors AA1 and AA2. Because it can.

  For example, the first amplification factor AA1 when the first detection position signal px is detected from the horizontal potential difference x10 by changing the resistance value of the Hall element signal processing circuit unit 45, and the second detection position signal from the vertical potential difference y10. The initial adjustment for changing the output values of the first and second detection position signals px and py can also be performed by changing the second amplification factor AA2 when detecting py.

  In this embodiment, a magnet used for position detection corresponding to the first and second position detection and driving magnets 411b and 412b is a coil or an electromagnet, and a current flowing through the coil or the electromagnet is changed to change the horizontal direction hole. Initial adjustment to change the output values of the first and second detection position signals px and py is also possible by changing the first and second magnetic flux densities B1 and B2 between the element hh10 and the vertical hall element hv10. is there.

  The first optimum horizontal hall element current value xsDi1 and the first optimum vertical hall element current value ysDi1 obtained by the first and second initial adjustments and recorded in the memory unit 72 are erased even when the power is turned off. Therefore, the first optimum horizontal hall element current value xsDi1 and the first optimum vertical hall element current value ysDi1 can be read many times with only the first and second initial adjustments.

  Next, the first and second initial adjustment procedures will be described with reference to the flowcharts of FIGS. In step S101, when the adjustment terminal 71 is turned on, the imaging apparatus 1 enters the adjustment mode, and when the first and second initial adjustments are started, the focal length of the photographing lens 67 becomes the first focal length F1. In step S102, the first PWM duty dx is output from the PWM0 of the CPU 21 to the driver circuit 29, and the movable part 30a is moved to one end point rx11 in the first direction x. In step S103, the first detection position signal px at this time is detected and input to the A / D2 of the CPU 21. In step S104, it is determined whether or not the output value of the first detection position signal px input to the CPU 21 matches the MAX value of the CPU 21 that can be A / D converted. If not, in step S105, the output value of D / A0 of the CPU 21 output to the hall element signal processing circuit unit 45 is changed, and the process returns to step S103. If they match, in step S106, the current value flowing through the input terminal of the horizontal hall element hh10 at this time (the first horizontal hall element current value xDi1 is temporarily recorded (stored) by the CPU 21 or the like.

  In step S107, the first PWM duty dx is output from the PWM 21 of the CPU 21 to the driver circuit 29, and the movable part 30a is moved to the other end point rx12 in the first direction x. In step S108, the first detection position signal px at this time is detected and input to A / D2 of the CPU 21. In step S109, it is determined whether or not the output value of the first detection position signal px input to the CPU 21 matches the MIN value that can be A / D converted by the CPU 21. If not, in step S110, the output value of D / A0 of the CPU 21 output to the hall element signal processing circuit unit 45 is changed, and the process returns to step S108. If they match, in step S111, the current value (second horizontal hall element current value xDi2) flowing through the input terminal of the horizontal hall element hh10 at this time is temporarily recorded (stored) by the CPU 21 or the like.

  In step S112, the second PWM duty dy is output from the PWM1 of the CPU 21 to the driver circuit 29, and the movable part 30a is moved to one end point ry11 in the second direction y. In step S113, the second detection position signal py at this time is detected and input to the A / D 3 of the CPU 21. In step S114, it is determined whether or not the output value of the second detection position signal py input to the CPU 21 matches the MAX value of the CPU 21 that can be A / D converted. If they do not match, in step S115, the output value of D / A1 of the CPU 21 output to the hall element signal processing circuit unit 45 is changed, and the process returns to step S113. If they match, in step S116, the current value (first vertical hall element current value yDi1) flowing through the input terminal of the vertical hall element hv10 at this time is temporarily recorded (stored) by the CPU 21 or the like.

  In step S117, the second PWM duty dy is output from the PWM1 of the CPU 21 to the driver circuit 29, and the movable part 30a is moved to the other end point ry12 in the second direction y. In step S118, the second detection position signal py at this time is detected and input to A / D3 of the CPU 21. In step S119, it is determined whether or not the output value of the second detection position signal py input to the CPU 21 matches the MIN value that can be A / D converted by the CPU 21. If not, in step S120, the output value of D / A1 of the CPU 21 output to the hall element signal processing circuit unit 45 is changed, and the process returns to step S118. If they match, in step S121, the current value (second vertical hall element current value yDi2) flowing through the input terminal of the vertical hall element hv10 at this time is temporarily recorded (stored) by the CPU 21 or the like.

  In step S122, it is determined whether or not the first horizontal hall element current value xDi1 is larger than the second horizontal hall element current value xDi2. If not, in step S123, the first horizontal hall element current value xDi1 is set as the first optimum horizontal hall element current value xsDi1, and this is recorded in the memory unit 72 in step S125, and the first initial adjustment is completed. To do. If larger, in step S124, the second horizontal hall element current value xDi2 is set as the first optimum horizontal hall element current value xsDi1, and this is recorded in the memory unit 72 in step S125, and the first initial adjustment is completed. .

  In step S126, it is determined whether or not the first vertical hall element current value yDi1 is larger than the second vertical hall element current value yDi2. If not, in step S127, the first vertical hall element current value yDi1 is set as the first optimum vertical hall element current value ysDi1, and is recorded in the memory unit 72 in step S129. In step S130, the second initial initial value is recorded. Finish the adjustment. If larger, in step S128, the second vertical hall element current value yDi2 is set as the first optimum vertical hall element current value ysDi1, and this is recorded in the memory unit 72 in step S129. In step S130, the second initial adjustment is performed. Exit.

  Next, the procedure of image blur correction processing that is 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. At this time, the second optimum horizontal hall element current value xsDi2 that varies according to the length of the focal length flows through the input terminal of the horizontal hall element hh10 of the hall element portion 44a. Further, the second optimum vertical hall element current value ysDi2 that varies according to the length of the focal length flows through the input terminal of the vertical hall element hv10.

  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.

  Next, the procedure of the imaging operation of the imaging apparatus 1 will be described with reference to the flowchart of FIG. When the power of the imaging apparatus 1 is turned on by turning on the Pon switch 11a in step S51, it is determined in step S52 whether or not the output to the port P15 of the CPU 21 is a Lo signal. If the Lo signal is output, the first and second initial adjustments described in the flowcharts of FIGS. 11 and 12 are performed in step S53. In step S54, the first and second initial adjustments are completed.

  If the Lo signal is not output in step S52, the first optimum horizontal hall element current value xsDi1 and the first optimum vertical hall element current value ysDi1 are stored in the memory via the port P6 of the CPU 21 in step S55. Read from the unit 72. In step S56, information regarding the value of the second focal length F2 is input from the photographic lens 67 via the port P7 of the CPU 21. In step S57, the focal length is adjusted, and the second optimum horizontal hall element current value xsDi2 and the second optimum vertical hall element current value ysDi2 are calculated. From the calculation result, the horizontal voltage XVf corresponding to the second optimum horizontal hall element current value xsDi2 is output from D / A0 of the CPU 21 and applied to the input terminal of the horizontal hall element hh10 via the 106th circuit 456. Also, the vertical voltage YVf corresponding to the second optimum vertical Hall element current value ysDi2 is output from D / A1 of the CPU 21 and applied to the input terminal of the vertical Hall element hv10 via the 116th circuit 466. In step S58, the image blur correction process described with reference to the flowchart of FIG. 13 is started as an interrupt process at regular time intervals (1 ms). The image blur correction process is performed independently of the procedure after step S59.

  In step S59, it is determined whether or not the correction switch 14a is turned on. If it is in the on state, the value of the parameter IS is set to 1 in step S60. If it is in the off state, the value of the parameter IS is set to 0 in step S61.

  In step S62, information relating to the value of the second focal length F2 is input from the photographing lens 67 via the port P7 of the CPU 21. In step S63, the focal length is adjusted, and the second optimum horizontal hall element current value xsDi2 and the second optimum vertical hall element current value ysDi2 are calculated. From the calculation result, the horizontal voltage XVf corresponding to the second optimum horizontal hall element current value xsDi2 is output from D / A0 of the CPU 21 and applied to the input terminal of the horizontal hall element hh10 via the 106th circuit 456. Also, the vertical voltage YVf corresponding to the second optimum vertical Hall element current value ysDi2 is output from D / A1 of the CPU 21 and applied to the input terminal of the vertical Hall element hv10 via the 116th circuit 466.

  In step S64, the photometry SW 12a is turned on, photometry is performed by driving the AE sensor of the AE unit 23, and the aperture value and the exposure time are calculated. In step S65, the AF sensor of the AF unit 24 is driven to perform distance measurement, and the focusing operation is performed by driving the lens control circuit of the AF unit 24.

  In step S66, charge accumulation of the image sensor 39a1 is performed. In step S67, the charge accumulated in the image sensor 39a1 during the exposure time is moved. In step S68, the moved charge is displayed on the display unit 17 as an image signal obtained by imaging.

  In step S69, it is determined whether or not the release SW 13a is turned on in accordance with a user instruction. If not turned on, the process returns to step S59 and the imaging operation is repeated. If it is turned on, charge accumulation of the image sensor 39a1 is performed in step S70. In step S71, the charge accumulated in the image sensor 39a1 during the exposure time is moved. In step S72, the moved electric charge is recorded in the video memory in the imaging apparatus 1 as an image signal obtained by imaging. The image signal recorded in step S73 is displayed on the display unit 17. Thereafter, the process returns to step S59 and the imaging operation is repeated.

  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, in the present embodiment, the position detecting Hall element portion 44a is disposed on the movable portion 30a, and the position detecting magnets (first and second position detecting and driving magnets 411b and 412b) are disposed on the fixed portion 30b. However, the configuration of the movable portion 30a and the fixed portion 30b may be reversed, that is, the movable portion 30a may include a position detection magnet, and the fixed portion 30b may include a Hall element portion.

  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 movable part 30a is movable in the first direction x and the second direction y with respect to the fixed part 30b, and detects the position in the first direction x and the position in the second direction y. Thus, the position of the movable part 30a is detected, but the movement and position detection of the movable part 30a are not limited to this, and move on a plane perpendicular to the optical axis LX (for example, movement only in a one-dimensional direction). ) Other forms may be used.

  Further, after the first and second initial adjustments, a mode of performing an adjustment for changing the current value in proportion to the focal length (adjustment for changing the current value in accordance with a moving range that changes in proportion to the focal length) will be described. However, the adjustment according to the focal length is not limited to proportional.

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 top view which shows the movement range of a movable part. It is a circuit block diagram of a Hall element part and a Hall element signal processing circuit part. When the position of the movable portion in the first direction is at one end point of the first horizontal movement range, the output value of the first detection position signal matches the maximum value that can be A / D converted by the CPU. It is a graph which shows the relationship between the displacement of the 1st direction of a movable part, and the output value of a 1st detection position signal when the electric current value which flows into an input terminal is adjusted. When the position of the movable part in the first direction is at the other end point of the first horizontal movement range, the output value of the first detection position signal matches the minimum value that can be A / D converted by the CPU. It is a graph which shows the relationship between the displacement of the 1st direction of a movable part, and the output value of a 1st detection position signal when the electric current value which flows into an input terminal is adjusted. It is a graph which shows the relationship between the displacement of the 1st direction of a movable part, and the output value of a 1st detection position signal when the electric current value which flows into the input terminal of a horizontal hall element is made into the 2nd optimal horizontal hall | hole element current value. . It is a flowchart which shows the first half part of the procedure of a 1st, 2nd initial adjustment. It is a flowchart which shows the second half part of the procedure of 1st, 2nd initial adjustment. It is a flowchart of an image blur correction process performed as an interrupt process at regular intervals. It is a flowchart which shows the procedure of an imaging operation.

Explanation of symbols

1 Imaging device 11 Pon button 12a Metering SW
13 Release button 13a Release SW
14 Image blur correction button 14a Image blur correction SW
17 Display unit 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 Two driving coils 39a Imaging unit 39a1 Imaging element 39a2 Stage 39a3 Holding unit 39a4 Optical low-pass filter 411b, 412b First and second position detection and driving magnets 431b and 432b First and second position detection and driving yoke 44a Hall element Part 45 Hall element signal processing circuit part 49a Movable substrate 50a Movement shaft 51a to 53a First to third horizontal movement bearing parts 54b to 57b First to fourth vertical movement bearing parts 64a Plate 65b Base plate 67 Shooting lens 71 Adjustment terminal 72 Memory dx, dy First and second PWM duty hh10 Horizontal hall element hv10 Vertical hall element L1, L2 First and second effective lengths LX Optical axis of photographing lens px, py First and second detection position signals vx, vy First 1. Second angular velocity

Claims (9)

A photographic lens with variable focal length;
A movable portion having either one of an image sensor and 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,
A first detection position signal for specifying a position in the first direction is output from the output signal of the horizontal magnetic field change detection element to detect the position of the movable part, and the movable signal is output from the output signal of the vertical magnetic field change detection element. A signal processing unit for outputting a second detection position signal for specifying a position in the second direction for detecting the position of the unit;
Control for calculating the positions of the movable part in the first and second directions after the first and second detection position signals are inputted and A / D converted, and controlling the movable part, the fixed part, and the signal processing part. Means and
The control means maximizes the width of the output value of each of the first and second detection position signals within a movable range of the movable portion proportional to a focal length of the photographing lens and within a range where A / D conversion is possible. An image blur correction apparatus that performs adjustment. In the adjustment, when the photographic lens has a first focal length, the first optimum horizontal magnetic field change detection element current value that flows to the input terminal of the horizontal magnetic field change detection element when detecting the position of the movable portion is A first initial adjustment obtained by increasing a first detection resolution when A / D converting the first detection position signal by changing a current value flowing through an input terminal of a horizontal magnetic field change detection element;
When the photographic lens is at the first focal length, the first optimum vertical magnetic field change detection element current value to be supplied to the input terminal of the vertical magnetic field change detection element at the time of detecting the position of the movable portion is represented by the vertical magnetic field. A second initial adjustment obtained by increasing a second detection resolution when the second detection position signal is A / D converted by changing a current value flowing through the input terminal of the change detection element;
Each of the first optimum horizontal magnetic field change detecting element current value and the first optimum vertical magnetic field change detecting element current value is multiplied by a predetermined coefficient, and the photographing lens includes the first focal length and the user's operation The second optimum horizontal magnetic field change detecting element current value when the second focal length is changed by the above, and the adjustment regarding the focal length for calculating the second optimum vertical magnetic field change detecting element current value. The image blur correction apparatus according to claim 1. In the first initial adjustment, the movable portion is located at one end point in the first direction within the movement range when the photographing lens is at the first focal length, and the output value of the first detection position signal is The first horizontal magnetic field change detecting element current value that flows through the input terminal of the horizontal magnetic field change detecting element when the A / D conversion is maximized within a possible range, the movable portion, the photographing lens is the first The horizontal direction when the output value of the first detection position signal is the minimum within the range where A / D conversion is possible at the other end point in the first direction within the movement range in the case of one focal length. A current value of a second horizontal magnetic field change detecting element flowing through the input terminal of the magnetic field change detecting element is obtained, and a smaller one of the first and second horizontal magnetic field change detecting element current values is determined as the first optimum horizontal direction. Magnetic field change detection element current value,
In the second initial adjustment, the movable portion is located at one end point in the second direction within the moving range when the photographing lens is at the first focal length, and the output value of the second detection position signal is The first vertical magnetic field change detection element current value that flows through the input terminal of the vertical magnetic field change detection element when the A / D conversion is maximized within a possible range, the movable portion, the photographic lens is the first value. The vertical direction when the output value of the second detection position signal is the smallest within the range where A / D conversion is possible at the other end point in the second direction within the movement range in the case of one focal length A current value of a second vertical magnetic field change detecting element flowing through the input terminal of the magnetic field change detecting element is obtained, and the smaller one of the first and second vertical magnetic field change detecting element current values is determined as the first optimum vertical direction. Magnetic field change detection element current value An image blur correction device according to Motomeko 2. The first focal length is the longest focal length among the photographing lenses,
The image blur correction apparatus according to claim 2, wherein the predetermined coefficient is based on a ratio of values of the first and second focal lengths. The movable part has the magnetic field change detection part,
The fixed part has the position detecting magnet part,
The magnetic field change detection unit has one horizontal magnetic field change detection element and one vertical magnetic field change detection element,
The position detection magnet unit is attached to a position facing the horizontal magnetic field change detection element and used for position detection in the first direction, and the vertical magnetic field change detection element. The image blur correction apparatus according to claim 1, further comprising: a second position detection magnet that is attached to an opposing position and is used for position detection in the second direction.   The movable portion includes a first drive coil used for moving the movable portion in the first direction, and a second drive coil used for moving the movable portion in the second direction. The first position detection magnet is also used to move the movable part in the first direction, and the second position detection magnet moves the movable part in the second direction. The image blur correction apparatus according to claim 5, wherein the image blur correction apparatus is also used for the purpose. The magnetic field change detection unit is a uniaxial Hall element,
The image blur correction apparatus according to claim 1, wherein both the horizontal magnetic field change detection element and the vertical magnetic field change detection element are Hall elements.   A memory which is connected to the control means and records the first optimum horizontal magnetic field change detecting element current value and the first optimum vertical magnetic field change detecting element current value, and the contents are not erased even when the power is turned off. The image blur correction apparatus according to claim 1, further comprising a unit. A photographic lens with variable focal length;
A movable part having either one of an image sensor or an image blur correction lens and movable on a plane perpendicular to the optical axis of the photographing lens;
A fixed part that movably supports the movable part on the plane,
Either one of the movable part or the fixed part has a magnetic field change detection part used for position detection of the movable part,
A signal processing unit that outputs a detection position signal for specifying a position for detecting the position of the movable unit from the output signal of the magnetic field change detection unit;
An image blur correction apparatus comprising: control means for adjusting an output value of the detection position signal in accordance with a focal length of the photographing lens.

Images