JP4598465B2 - Image sensor support mechanism - Google Patents

Description

  The present invention relates to an image sensor support mechanism for supporting an image sensor that has a simple configuration and can be translated and rotated in a two-dimensional direction for image blur correction.

  Conventionally, in order to correct image blur due to camera shake of a photographer, image blur correction means for correcting camera image blur by moving a correction lens on a plane perpendicular to the optical axis according to the amount of camera shake. Was known.

  As such an image blur correction means, there is a correction optical system support mechanism for improving workability at the time of manufacturing by providing a holding means in advance in either a movable frame provided with a correction lens or a fixed member for holding the movable frame. (Patent Document 1).

However, the support mechanism according to Patent Document 1 has a complicated structure for holding the movable frame, and further simplification is required.
Japanese Patent No. 3423493

  Therefore, an object of the present invention is to provide an image sensor support mechanism having a simple configuration that enables the image sensor to be moved on a plane perpendicular to the optical axis for image blur correction of the camera.

  The imaging device support mechanism of the present invention is arranged between the first fixing portion, the second fixing portion whose position is fixed relative to the first fixing portion, and the first fixing portion and the second fixing portion. A movable portion in which an imaging element is provided on a surface facing the first fixed portion, and a first fixed portion that is sandwiched between the first fixed portion and the movable portion and abuts against one or both of the first fixed portion and the movable portion. Three or more first support members that are two-dimensionally arranged in the movable part and the movable part, and two-dimensionally arranged when viewed from the direction perpendicular to the imaging surface of the image sensor sandwiched between the second fixed part and the movable part A single second support member that is disposed inside a first support figure formed to surround each of the first support members formed and abuts against one or both of the second fixed portion and the movable portion. It is characterized by.

  The first support member is preferably formed in a spherical shape. Further, the first support member is fixed to one of the first fixed part and the movable part, and in particular, the first support member is fixed by being formed integrally with either the first fixed part or the movable part. It is preferable that the portion of the first support member that contacts the first fixed portion or the movable portion is formed in a convex spherical shape.

  In addition, either one or both of the first fixed portion and the movable portion have a first contact plane member that is parallel to the imaging surface and faces the first support member, and the first contact plane member includes a first contact plane member. Preferably, the support members abut, and each first abutment plane member has a first inner wall surface, and the first support member is in a state where the first support member abuts the first abutment plane member. It is preferable to be surrounded by the first inner wall surface.

  The second support member is preferably formed in a spherical shape. The second support member is fixed to one of the second fixed portion and the movable portion, and in particular, the second support member is fixed by being integrally formed with either the second fixed portion or the movable portion. Further, it is preferable that the portion of the second support member that contacts the second fixed portion or the movable portion is formed in a convex spherical shape.

  Further, it is preferable that either one or both of the second fixed portion and the movable portion have a second abutting plane member parallel to the imaging surface, and the second supporting member abuts on the second abutting plane member. Furthermore, it is preferable that the second contact flat member has a second inner wall surface, and the second support member is surrounded by the second inner wall surface in a state where the second support member is in contact with the second contact flat member.

  Further, it is preferable that the second fixed portion has elasticity and is biased in a direction in which the second support member is pressed against the movable portion. Or it is preferable to provide the elastic body which is provided in a 2nd fixed part or the said movable part, and urges | biases in the direction which presses a 2nd support member to a movable part.

  It is preferable that the vicinity of the center of the imaging element on the imaging surface, the center of gravity of the first supporting figure, and the center of gravity of the second supporting member on the side facing the movable portion overlap when viewed from the direction perpendicular to the imaging surface.

  According to the present invention, it is possible to improve the assemblability by making the imaging device support mechanism for image blur correction that enables the imaging device to move on a plane perpendicular to the optical axis small and simple. .

Embodiments of the present invention will be described below with reference to the drawings.
A camera provided with an image sensor in the image sensor holding mechanism to which the first embodiment of the present invention is applied and having an image blur correction function will be described with reference to FIGS. In order to describe the direction, the horizontal direction orthogonal to the optical axis LX in the camera 60 is the first direction x, the vertical direction perpendicular to the optical axis LX is the second direction y, and the direction parallel to the optical axis LX is the third direction. The direction z will be described. 4 shows a configuration diagram in a section taken along line IV-IV in FIG. 3, and FIG. 5 shows a configuration diagram in a section taken along line VV in FIG.

  The camera 60 includes a power button 61 for switching on / off the main power, a release button 62, an LCD monitor 63, a CPU 40, an imaging block 44, an AE unit 45, an AF unit 46, an imaging unit 64, and a photographing lens 68. Is done.

  By pressing the power button 61, the power switch 47 is turned on / off. The subject image is received by the imaging element 48 provided in the imaging unit 64 via the photographing lens 68. The image sensor 48 is, for example, a CCD. The captured subject image is displayed on the LCD monitor 63.

  When the release button 62 is half-pressed, the photometry switch 41 is turned on to perform photometry, distance measurement, and focusing, and when fully pressed, the release switch 42 is turned on to perform the release operation. .

  In the CPU 40, control of each unit relating to image blur correction described later and control of the operation of the entire camera 60 are performed.

  The imaging unit 64 is driven by the imaging block 44. The AE unit 45 performs a photometric operation on the subject to calculate an exposure value. Next, an aperture value and an exposure time required for photographing are calculated based on the calculated exposure value. Distance measurement is performed by the AF unit 46. Based on this distance measurement, the photographing lens 68 is displaced in the direction of the optical axis to adjust the focus.

  The image blur correction device (not shown) of the camera 60 includes an image blur correction button 69, a CPU 40, an angular velocity detection unit 49, a driver circuit 52 for driving, an image sensor support mechanism 10, a hall element signal processing unit 53, and a photographing lens 68. Consists of.

  When the image blur correction button 69 is pressed, the image blur correction switch 43 is turned on. When the image blur correction switch 43 is turned on, the angular velocity detection unit 49 and the image sensor support mechanism 10 are driven at regular intervals independently of other operations such as photometry, and image blur correction is performed.

  Various outputs corresponding to the input signals of the switches 41 to 43 are controlled by the CPU 40. On / off information of the photometry switch 41, the release switch 42, and the image blur correction switch 43 is input to the ports P41, P42, and P43 of the CPU 40 as 1-bit digital signals, respectively.

  Next, details of the angular velocity detection unit 49, the driver circuit 52 for driving, the image sensor support mechanism 10, and the Hall element signal processing unit 53 and the input / output relationship to the CPU 40 will be described.

The angular velocity detector 49 includes first to third angular velocity sensors 50 _a , 50 _b , 50 _c , and an amplifier / high-pass filter circuit 51. Detected angular velocity of the first direction x of the camera 60 at predetermined time intervals (1 ms) by the first angular velocity sensor 50 _a, the angular velocity of the second direction y of the camera 60 at predetermined intervals likewise by the second angular velocity sensor 50 _b Detected. Rotational angular velocity is detected in the third angular velocity sensor 50 on a plane perpendicular to the third direction z of the camera 60 at predetermined intervals by _c (hereinafter referred to as the xy plane).

The amplifier / high-pass filter circuit 51 amplifies signals corresponding to the angular velocity in the first direction x and the second direction y and the rotational angular velocity on the xy plane, and then the first to third angular velocity sensors 50 _a , 50 _b. , 50 _c null voltage and panning are removed from the amplified signal. The signal from which the null voltage or the like has been removed by the amplifier / high-pass filter circuit 51 is input to the A / D0, A / D1, and A / D2 of the CPU 40 as the first, second, and third angular velocities vx, vy, and vθ. .

  The first, second, and third angular velocities vx, vy, vθ input from A / D0, A / D1, and A / D2 are A / D converted by the CPU 40. The CPU 40 calculates the image blur amount generated in a predetermined time based on the conversion coefficients considering the first, second, and third angular velocities vx, vy, vθ, the focal length, and the like after A / D conversion. This image blur amount is calculated as a displacement amount of the rotation angle on the first direction x, the second direction y, and the xy plane.

  The CPU 40 calculates the position S where the imaging unit 64 should move according to the calculated image blur amount. In this calculation, the first direction, the second direction, and the rotation angle on the xy plane are also taken into consideration. The first direction x component of the position S is sx, the second direction y component is sy, and the rotation angle component on the xy plane is sθ.

  The movable unit 20 provided with the imaging unit 64 is moved by an electromagnetic force described later. For the driving force D for moving the movable part 20 to the position S including rotation, the two first direction x components are the first and second horizontal PWM duties dx1, dx2, and the one second direction y component is the vertical direction. The PWM duty is dy.

  The imaging element support mechanism 10 includes a movable part 20 provided with an imaging part 64, a first fixed part 30, and a second base plate 36 that is a second fixed part. By moving the imaging unit 64 to the position S to be moved calculated by the CPU 40 including rotation, the deviation of the optical axis LX on the imaging surface of the subject image caused by blur on the xy plane including rotation is removed. The Therefore, the image blur correction is executed while the subject image and the imaging plane position are kept constant.

  The movable unit 20 is driven by a first drive unit, a second drive unit, and a third drive unit (not shown) that are controlled by a driver circuit 52 for driving. The first to third driving units drive the driver circuit 52 based on the first and second horizontal PWM duties dx1 and dx2 output from the PWM0 and PWM1 in the CPU 40 and the vertical PWM duty dy output from the PWM2. Controlled by.

The position P of the movable unit 20 by the first to third driving units is detected by the first to third Hall elements 23 _a , 23 _b , 23 _c and the Hall element signal processing unit 53. The detected position P includes the first and second horizontal position detection signals px1 and px2 as the first direction x component, and the vertical position detection signal py as the second direction y component, respectively. Input to D4 and A / D5. The first and second horizontal position detection signals px1 and px2, and the vertical position detection signal py are A / D converted by A / D3 to A / D5.

  Two first direction x components and one second direction y component of the position P after A / D conversion with respect to the first and second horizontal position detection signals px1, px2, and the vertical position detection signal py Let the data be pdx1, pdx2, and pdy, respectively. From these data, the first direction x component pxx, the second direction y component pyy, and the rotation angle pθ of the position P of the movable unit 20 are calculated. The first to third driving units are controlled based on the calculated data of the position P (pxx, pyy, pθ) and the data of the position S (sx, sy, sθ) to be moved.

The first driving unit is constituted by the first coil 21 _a and the first drive magnet 31 _a for vertical driving. The second drive unit includes a second coil 21 _b for horizontal driving and a second drive magnet 31 _b . Third driving unit is constituted by the third coil 21 _c and the third drive magnet 31 _c for horizontal driving.

The movable unit 20 includes a movable substrate 22, a support receiving plate 24, and a plate 25. The movable substrate 22 is provided with first to third coils 21 _a , 21 _b , 21 _c , and first to third Hall elements 23 _a , 23 _b , 23 _c , and the imaging unit 64 is provided on the plate 25. It is done. The first fixing part 30 includes first to third yokes 32 _a , 32 _b , 32 _c and a first base plate 33. The first to third yokes 32 _a , 32 _b and 32 _c are provided with first to third drive magnets 31 _a , 31 _b and 31 _c .

The movable portion 20 and the first fixed portion 30 sandwich the three first support members 11 _a , 11 _b , 11 _c formed in a spherical shape. The first support members 11 _a , 11 _b , and 11 _c are on a plane perpendicular to the third direction z, and are respectively a support receiving plate 24 that constitutes the movable portion 20 and a first base plate that constitutes the first fixed portion 30. It is contact | abutted so that rolling with 33 is possible.

The first support members 11 _a , 11 _b , 11 _c are two-dimensionally arranged with respect to the support receiving plate 24 or the first base plate 33. That is, the first support members 11 _a , 11 _b , 11 _c are arranged on the support receiving plate 24 or the first base plate 33 in a non-linear manner. In addition, the first support members 11 _a , 11 _b , when viewed from the third direction z in the initial state before the movable part 20 linearly moves in the first direction x and the second direction y and rotates. The initial positions of the first support members 11 _a , 11 _b and 11 _c are adjusted so that the center of gravity of the figure surrounding 11 _c overlaps with the optical axis LX.

The movable part 20 and the first fixed part 30 are kept in contact via the first support members 11 _a , 11 _b and 11 _c . With such a configuration, the movable unit 20 can move to the first fixed unit 30 in a state in which the movable unit 20 can be translated in the first direction x or the second direction y and can be rotated about a straight line parallel to the third direction z. Supported. In addition, the structure by which 4 or more 1st support members are pinched | interposed may be sufficient.

  The second base plate 36 is an elastic member such as a leaf spring, for example, and the first fixed portion 30 is sandwiched between the first fixed portion 30 and the second base plate 36 as described later. Fixed to. A single second support member 12 is fixed to the surface of the second base plate 36 that faces the movable portion 20. The second support member 12 may be formed integrally with the second base plate 36 and fixed. According to the structure formed integrally, the assemblability is further improved.

  The second support member 12 is provided at a position overlapping the optical axis LX when viewed from the third direction z (see FIG. 6). The tip of the second support member 12 is formed in a convex spherical shape, and is brought into contact with the movable part 20 while being sandwiched between the second base plate 36 and the movable part 20 (see FIG. 4). By fixing the second base plate 36 to the first fixing portion 30, the second support member 12 is biased in the direction in which the second support member 12 presses the movable portion 20.

Note that the second supporting member 12 is disposed inside the first supporting figure surrounded by the third when viewed from the direction z the first support member _{11 a, 11 b, 11 c} ( see FIG. 6 numeral F). Since the second support member 12 is positioned inside the first support figure F, the movable portion 20 can be positioned between the first support members 11 _a , 11 _b , 11 _c and the second support member 12 without losing balance. Can be supported.

  In order to make maximum use of the imaging range of the image sensor 48, the movable unit 20 is movable in both the first direction x and the second direction y when the optical axis LX of the photographic lens 68 is in a positional relationship passing near the center of the image sensor 48. The positional relationship between the movable portion 20 and the first fixed portion 30 is adjusted so as to be positioned at the center of the range. In addition, in the initial state before the movable unit 20 linearly moves in the first direction x and the second direction y and rotates, the movable unit 20 is positioned at the center of the movement range. The positional relationship of the first fixing unit 30 is set.

  Furthermore, in the initial state, each of the four short sides that form the imaging surface of the imaging device 48 is in a state parallel to either the first direction x or the second direction y. The positional relationship of the fixed part 30 is set. Note that the center of the image sensor 48 is the intersection of two diagonal lines of the short form forming the imaging surface of the image sensor 48.

  In the movable unit 20, the imaging unit 64 and the plate 25 are attached to the movable substrate 22 in the optical axis direction when viewed from the direction of the photographing lens 68. The imaging unit 64 includes an imaging element 48, a stage 65, a pressing unit 66, and an optical low-pass filter 67. The stage 65 and the plate 25 sandwich the image sensor 48, the pressing portion 66, and the optical low-pass filter 67.

  In a state where the image pickup device 48 is attached to the movable substrate 22 via the plate 25, the attachment is adjusted so that the image pickup surface of the image pickup device 48 is perpendicular to the optical axis LX. The plate 25 is a plate-like material, and the mounting is adjusted so that the imaging surface and the plane of the plate 25 are parallel. The plate 25 is made of metal, and can dissipate heat from the image sensor 48 by being in contact with the image sensor 48.

  In an initial state before the movable unit 20 moves and rotates, a hole 27 is formed in the movable substrate 22 at a position overlapping the optical axis LX. The hole 27 is covered with the plate 25 on the first fixing portion 30 side. With such a configuration, the movable portion 20 has a recess having a second inner wall surface (a wall surface that forms the hole 27) and a second bottom surface 28 that is a plane parallel to the imaging surface when viewed from the second base plate 36 side. Will be formed.

  In the initial state before the movable part 20 moves and rotates, the second support member 12 is in contact with the second bottom surface 28. The second support member 12 is slidable with respect to the second bottom surface 28, and the movable portion 20 is movable in the first direction x and the second direction y. In a state where the second support member 12 is in contact with the second bottom surface 28, the second support member 12 is surrounded by the second inner wall surface. By surrounding the second support member 12 with the second inner wall surface, the movement of the movable portion 20 can be restricted.

  The size of the hole 27 is determined according to the range in which the movement of the movable portion 20 is restricted. That is, when the movable range of the movable part 20 is increased, the size of the hole 27 is determined according to the size of the movable range.

The support receiving plate 24 is provided with first contact flat surface portions 24 _a , 24 _b , 24 _c for contacting the first support members 11 _a , 11 _b , 11 _c . The first abutting flat surface portions 24 _a , 24 _b and 24 _c are arranged so as to be parallel to the imaging surface of the imaging element 48 and disposed at positions facing the first supporting members 11 _a , 11 _b and 11 _c. The receiving plate 24 is attached to the stage 65.

The movable substrate 22 is formed in a deformed T shape. Movable substrate 22, the substrate central portion 22 _e of the imaging unit 64 is mounted, the first end portion 22 _a extending from the substrate center portion 22 _e in the second direction y, the second extending from the substrate center portion 22 _e in the first direction x It has an end 22 _b and a third end 22 _c . The second end 22 _b and the third end 22 _c are formed so as to be displaced from the first direction x. The movable substrate 22 may be formed in a T shape.

In the movable substrate 22, the first coil 21 _a in the first end portion 22 _a, the second coil 21 _b to the second end portion 22 _b, the third coil 21 _c provided on the third end 22 _c. The first to third coils 21 _a , 21 _b , 21 _c are formed as sheet-like and spiral coil patterns.

The coil pattern of the first coil 21 _a is a movable portion 20 including the first coil 21 _a by a first electromagnetic force Pw1 generated from the direction and the magnetic field direction of the first driving magnet 31 _a of the current of the first coil 21 _a In order to move in the second direction y, it has a line segment parallel to the first direction x.

The coil pattern of the second coil 21 _b is a movable portion 20 by the second electromagnetic force Pw2 resulting from the second coil 21 _b direction and the magnetic field direction of the second driving magnet 31 _b of current including the second coil 21 _b In order to move in the first direction x, it has a line segment parallel to the second direction y.

The coil pattern of the third coil 21 _c is a movable portion 20 including the third coil 21 _c third coil 21 _c by the third electromagnetic force Pw3 resulting from the direction and the direction of the magnetic field of the third drive magnet 31 _c of the current In order to move in the first direction x, it has a line segment parallel to the second direction y.

The first electromagnetic force Pw1 a resultant force of the electromagnetic force applied to each of the first direction x and parallel to the line segment of the first coil 21 _a. As the first driving point 26 _a first electromagnetic force Pw1 is a point which can be regarded as such concentrated on one point at the center of the first coil 21 _a, the coil pattern of the first coil 21 _a is formed. Similarly, as the second driving point 26 _b second electromagnetic force Pw2 is a point which can be regarded as such concentrated on one point at the center of the second coil 21 _b, the coil pattern of the second coil 21 _b is formed is, as a third driving point 26 _c third electromagnetic force Pw3 is a point which can be regarded as such concentrated on one point at the center of the third coil 21 _c, the coil patterns of the third coil 21 _c is formed The

In an initial state in which the movable unit 20 is not rotated, the line segment connecting the first drive point 26 _a and the center of the image sensor 48 is parallel to the second direction y so that the first coil 21 _{a is} on the movable substrate 22. Is placed. The straight line connecting the second drive point 26 _b and the third drive point 26 _c is the first line so that the center of the line segment connecting the second drive point 26 _b and the third drive point 26 _c overlaps the center of the image sensor 48. The second and third coils 21 _b and 21 _c are arranged on the movable substrate 22 so as to have a relationship that intersects with a straight line parallel to the direction x, that is, a relationship that is not parallel to the first direction x.

  By adopting such a configuration, by controlling the direction and magnitude of the first to third electromagnetic forces Pw1 to Pw3, the movable part 20 is moved on the plane parallel to the first direction x and the second direction y. It is movable in one direction x or the second direction y, and is rotatable around a straight line that passes through the center of the image sensor 48 and is perpendicular to a plane parallel to the first direction x and the second direction y.

Further, since the first to third coils 21 _a , 21 _b , and 21 _c are configured as sheet coils, the thickness of each coil 21 _a , 21 _b , 21 _c in the third direction z can be reduced. . Further, even if a plurality of sheet coils are stacked in the third direction z in order to increase the electromagnetic force, it is possible to hardly increase the thickness in the third direction z. Accordingly, it is possible to reduce the size of the stage drive mechanism 10 by narrowing the interval between the movable portion 20 and the first fixed portion 30.

The first to third coils 21 _a , 21 _b , 21 _c are connected to a driving driver circuit 52 that drives them via a flexible substrate (not shown). The driving driver circuit 52 receives the first and second horizontal PWM duties dx1, dx2 and the vertical PWM duty dy from the PWM0, PWM1, and PWM2 of the CPU 40, respectively.

The driver circuit 52 for driving supplies electric power to the first coil 21 _a according to the value of the input vertical direction PMW duty dy, and moves the movable part 20 in the second direction y. The driving driver circuit 52 supplies electric power to the second and third coils 21 _b and 21 _c according to the values of the input first and second horizontal PMW duties dx1 and dx2, respectively. The movable part 20 is rotated on the xy plane by moving in the first direction x.

  When the movable unit 20 is translated in the first direction x, the CPU 40 causes the first and second horizontal PWM duties dx1, the second and third electromagnetic forces Pw2 and Pw3 to have the same direction and the same magnitude. The value of dx2 is controlled.

  When the movable unit 20 is rotated on the xy plane without being translated in the first direction x, the first and second electromagnetic forces Pw2 and Pw3 are reversed and have the same magnitude by the CPU 40. The values of the two horizontal PWM duties dx1, dx2 are controlled.

  When the movable unit 20 is moved in the first direction x and rotated on the xy plane, the CPU 40 causes the first and second horizontal PWM duties so that the second and third electromagnetic forces Pw2 and Pw3 have different magnitudes. The values of dx1 and dx2 are controlled.

The first hall element 23 _a is provided at a position overlapping the first driving point 26 _a in the third direction z. The second Hall element 23 _b is provided at a position overlapping the intersection of a straight line that passes through the center of the image sensor 48 and is parallel to the first direction x and a straight line that passes through the second drive point 26 _b and is parallel to the second direction y. The third Hall element 23 _c is provided at a position overlapping the intersection of a straight line passing through the center of the image sensor 48 and parallel to the first direction x and a straight line passing through the third drive point 26 _c and parallel to the second direction y.

In the first fixing portion 30, the first to third yoke 32 _a in the first base plate 33 is a plate-shaped member, 32 _b, 32 _c, and the first to third drive magnets 31 _a, 31 _b, 31 _c Is provided. The first base plate 33 is parallel to the imaging surface of the imaging element 48 and is disposed between the movable substrate 22 and the imaging lens 68. A recess is formed in the first base plate 33 at a position facing the first support members 11 _a , 11 _b , and 11 _c . A first bottom surface 34 that is a plane parallel to the imaging surface and a first inner wall surface 35 that is parallel to the third direction z are formed in the recess.

The first support members 11 _a , 11 _b , and 11 _c are in contact with the first bottom surface 34 of the first base plate 33 (see FIG. 4). In a state where the first support members 11 _a , 11 _b and 11 _c are in contact with the first bottom surface 34, the first support members 11 _a , 11 _b and 11 _c are surrounded by the first inner wall surface 35.

By surrounding the first support members 11 _a , 11 _b , 11 _c with the first inner wall surface 35, the first support members 11 _a , 11 _b , 11 _c from between the support receiving plate 24 and the first base plate 33 are _arranged . Withdrawal is prevented. Furthermore, it is possible to prevent the first support members 11 _a , 11 _b , and 11 _c from falling off from the first base plate 33 when the image pickup device support mechanism 10 is manufactured.

First driving magnet 31 _a is to face the first coil 21 _a and the first Hall element 23 _a and the third direction z, via the first yoke 32 _a on the surface of the movable portion 20 side of the first base plate 33 Provided. Similarly, the second drive magnet 31 _b faces the second coil 21 _b and the second Hall element 23 _b in the third direction z, and the second yoke 32 is provided on the surface of the first base plate 33 on the movable portion 20 side. provided through _b . Similarly, the third drive magnet 31 _c is opposed to the third coil 21 _c and the third Hall element 23 _c in the third direction z, and the third yoke 32 is provided on the surface of the first base plate 33 on the movable portion 20 side. _c is provided.

The first drive magnet 31 _a has N and S poles arranged in the second direction y. The first coil as the magnetic field on the first coil 21 _a and the first Hall element 23 _a does not change when the length of the first direction x of the first driving magnet 31 _a is the movable portion 20 moves in the first direction x It is longer formed than the first effective length L1 of the first direction x of 21 _a.

The second drive magnet 31 _b has N and S poles arranged in the first direction x. The length of the second drive magnet 31 _b in the second direction y is such that the magnetic field exerted on the second coil 21 _b and the second Hall element 23 _b does not change when the movable part 20 moves in the second direction y. It is longer formed than the second effective length L2 in the second direction y of 21 _b.

The third drive magnet 31 _c has N and S poles arranged in the first direction x. The length of the third drive magnet 31 _c in the second direction y is such that the magnetic field exerted on the third coil 21 _c and the third Hall element 23 _c does not change when the movable part 20 moves in the second direction y. It is longer formed in comparison with the third effective length L3 of the second direction y of 21 _c.

The first yoke 32 _a is formed by a polygonal soft magnetic member having a U-shape when viewed in the first direction x. First driving magnet 31 _a between the U-shaped shape of the first yoke 32 _a, while the first coil 21 _a, and the first Hall element 23 _a sandwiched between the third direction z, the first yoke 32 _a is first The first base plate 33 is fixed to the surface of the movable unit 20 side.

The side of the portion in contact with the first driving magnet 31 _a in the first yoke 32 _a, leakage is prevented to the surrounding field of the first driving magnet 31 _a. The first yoke 32 _a has a portion facing the first driving magnet 31 _a and a portion facing the first driving magnet 31 _a , and between the first driving magnet 31 _a and the first coil 21 _a and the first driving magnet 31 _a. When the magnetic flux density between the first Hall element 23 _a is increased.

The second yoke 32 _b is formed by a polygonal soft magnetic member having a U-shape when viewed in the second direction y. Second drive magnet 31 _b between the U-shaped shape of the second yoke 32 _b, while the second coil 21 _b, and the second Hall element 23 _b sandwiched between the third direction z, the second yoke 32 _b first The first base plate 33 is fixed to the surface of the movable unit 20 side.

The side of the portion in contact with the second drive magnet 31 _b in the second yoke 32 _b, the leakage is prevented to the surrounding field of the second drive magnet 31 _b. Further, the portion of the second yoke 32 _b facing the second drive magnet 31 _b and the portion facing the second drive magnet 31 _b, between the second drive magnet 31 _b and the second coil 21 _b , and the second drive magnet 31 _b And the magnetic flux density between the second Hall element 23 _b is increased.

The third yoke 32 _c is formed by a soft magnetic member polygonal prism having a u-shape channel when viewed from the second direction y. Third drive magnet 31 _c between the U-shaped shape of the third yoke 32 _c, while a third coil 21 _c, and the third Hall element 23 _c sandwiched between the third direction z, the third yoke 32 _c first 1 fixed to the movable part 20 side on the base plate 33.

The side of the portion in contact with the third drive magnet 31 _c in the third yoke 32 _c, leakage is prevented to the surrounding magnetic field of the third drive magnet 31 _c. Further, the portion of the third yoke 32 _c facing the third drive magnet 31 _c and the portion facing the third drive magnet 31 _c, between the third drive magnet 31 _c and the third coil 21 _c , and the third drive magnet 31 _c And the third Hall element 23 _c are increased in magnetic flux density.

The second base plate 36 is fixed to the first to third yokes 32 _a , 32 _b and 32 _c constituting the first fixing portion 30 from the opposite side of the first base plate 33 (see FIGS. 3 and 4).

The first to third Hall elements 23 _a , 23 _b , and 23 _c are magnetoelectric transducers that use the Hall effect, and are a first direction x and a second direction y (first and second horizontal direction detection of the movable part 20). This is a uniaxial Hall element that detects position signals px1, px2, and a vertical direction detection position signal py). The position in the second direction y is detected by the first Hall element 23 _{a, and} the position in the first direction x is detected by the second and third Hall elements 23 _b and 23 _c .

Magnetic fields _generated from the first to third drive magnets 31 _a , 31 _b , 31 _c are also used for position detection. First position detecting means (not shown) is formed by a first drive magnet 31 _a and the first Hall element 23 _a. Similarly, a second position detecting means (not shown) is formed by the second driving magnet 31 _b and the second Hall element 23 _b, and a third position is formed by the third driving magnet 31 _c and the third Hall element 23 _c. Detection means (not shown) are formed.

The first hall element 23 _a is stacked on the first coil 21 _a in the third direction z. By laminating the first Hall element 23 _a centrally located point of the first coil 21 _a is a first driving point 26 _a, the magnetic field for driving the magnetic field generating region and movable section 20 for position detection Since the generation region is shared, the lengths of the first drive magnet 31 _a and the first yoke 32 _a in the second direction y can be shortened.

In order to perform position detection by making maximum use of a range in which position detection with high accuracy can be performed using a linear change amount, the first drive magnet is used when the vicinity of the center of the image sensor 48 is in a positional relationship passing through the optical axis LX. The position of the first Hall element 23 _a is adjusted so as to be arranged in the vicinity of the equidistant from the N pole and the S pole of 31 _a .

Similarly, the position of the second hall element 23 _b in the first direction x is the same as the N pole and S pole of the second drive magnet 31 _b when the vicinity of the center of the image sensor 48 is in a positional relationship passing through the optical axis LX. The position of the third hall element 23 _c in the first direction x is adjusted so as to be arranged in the vicinity of the distance, and the position of the third drive magnet 31 _c is adjusted so that the vicinity of the center of the image sensor 48 passes through the optical axis LX. It is adjusted so as to be arranged in the vicinity of the same distance as the N pole and the S pole.

The hall element signal processing unit 53 includes first to third hall element signal processing circuits 54 _a , 54 _b and 54 _c . The first to third Hall element signal processing circuits 54 _a , 54 _b , 54 _c are connected to the first to third Hall elements 23 _a , 23 _b , 23 _c through flexible substrates (not shown), respectively.

The first hall element signal processing circuit 54 _a, the potential difference between the output terminals of the first Hall element 23 _a is detected from the output signal of the first Hall element 23 _a. Based on the detected potential difference, a vertical detection position signal py that specifies the position in the second direction y of the portion where the first Hall element _23a is located (point A, see FIG. 7) is input to the A / D 5 of the CPU 40. .

The second Hall element signal processing circuit 54 _b, the potential difference between the output terminals of the second Hall element 23 _b is detected from the output signal of the second Hall element 23 _b. The detected potential difference is a second Hall element 23 _b based on the partial (point see B, FIG. 7) the first horizontal detection position signal px1 locating the first direction x of the input to the A / D3 of the CPU40 Is done.

The third Hall element signal processing circuit 54 _c, the potential difference between the output terminals of the third Hall element 23 _c is detected from the output signal of the third Hall element 23 _c. The third Hall element 23 _c is a moiety (point C, see FIG. 7) based on the detected potential difference the second horizontal detection position signal px2 locating the first direction x of the input to the A / D4 of CPU40 Is done.

The position of the movable part 20 including the rotation angle is specified by the three Hall elements 23 _a , 23 _b , and 23 _c . The position in the second direction y for one point on the movable part 20 is specified by the first Hall element 23 _a . The positions of the two points on the movable portion 20 in the first direction x are specified by the second and third Hall elements 23 _b and 23 _c . Based on the position information in the first direction x for two points and the position information in the second direction y for one point, the position including the rotation angle of the movable unit 20 can be specified.

A method for specifying the position of the movable unit 20 will be described with reference to FIG. From the position information of the points A, B, and C, the position data (pxx, pyy, pθ) of the point P is obtained. Point A is the position of the first Hall element 23 _a, the point B position of the second Hall element 23 _b, the point C indicates the position of the third Hall element 23 _c. The point P is an intersection of a line passing through the point A and the line segment BC orthogonal to the line segment BC.

The point P is aligned with the midpoint of the line segment BC, and the lengths of the line segment AP, the line segment BP, and the line segment CP are the same, so that the first to third Hall elements 23 _a in the movable unit 20 are the same. , 23 _b , 23 _c are adjusted. Further, the first to third Hall elements 23 _a , 23 _b , 23 _c and the image sensor 48 are arranged in the movable unit 20 so that the point P and the center of the image sensor 48 overlap in the third direction z.

For point A, the position in the second direction y is detected by the first Hall element 23 _a (vertical direction detection signal py). For the point B, the position of the first direction x is detected by the second Hall element 23 _b (first horizontal direction detection signal px1). For point C, the position of the first direction x is detected by the third Hall element 23 _c (the second horizontal direction detection signal px2).

A position P (pxx, The value of (pyy, pθ) is obtained by the following equations (1) to (3).
pxx = (pdx1 + pdx2) / 2 (1)
pyy = pdy−d × cos (pθ) (2)
pθ = cos ⁻¹ {(pdx1−pdx2) / (2 × d)} (3)
Here, as shown in FIG. 6, the rotation angle pθ is an angle formed by the line segment BP and the first direction x, and is an angle formed by the line segment AP and the second direction y.

  Next, an image sensor support mechanism to which the second embodiment is applied will be described. In the second embodiment, the configurations of the support receiving plate and the first support member are different from those of the first embodiment. Hereinafter, the second embodiment will be described with reference to FIG. 8 with a focus on differences from the first embodiment. Parts having the same functions as those in the first embodiment are given the same reference numerals. FIG. 8 is a configuration diagram in a cross section of the imaging element support mechanism to which the second embodiment is applied in a plane passing through the imaging center and parallel to the second direction y and the third direction z.

Three first support members 110 _a , 110 _b , 110 _c (first support member 110 _b not shown) sandwiched between the movable portion 20 and the first fixed portion 30 are support receiving plates constituting the movable portion 20. 240 is fixed. The tips of the first support members 110 _a , 110 _b , 110 _c on the first fixed portion 30 side are formed in a convex spherical shape. The first support members 110 _a , 110 _b , and 110 _c are slidably contacted with the first base plate 33 constituting the first fixing portion 30 at the tips of the convex spherical surfaces in the first direction x and the second direction y. .

  Even with the above-described configuration, the movable portion 20 is movable in the first direction x, the second direction y, and the first fixed portion 30 while being rotatable about a straight line parallel to the third direction z. Can be supported.

In the present embodiment, the first support members 110 _a , 110 _b , and 110 _c are fixed to the movable portion 20, but the first support members 110 _a , 110 _b , and 110 _c are fixed to the first fixing portion 30. The tip of the movable part 20 side may be formed in a convex spherical shape, and the convex spherical tip may be brought into contact with the support receiving plate 24 constituting the movable part 20. In the present embodiment, the first support members 110 _a , 110 _b , and 110 _c are fixed to the movable portion 20. However, the first support members 110 _a , 110 _b , and 110 _c are integrated with the movable portion 20. The structure formed and fixed to may be sufficient. According to the structure which forms integrally, assembly property further improves.

  Next, an image sensor support mechanism to which the third embodiment is applied will be described. In 3rd Embodiment, the structure of a 2nd supporting member and a 2nd fixing | fixed part differs from 1st Embodiment. Hereinafter, the third embodiment will be described with reference to FIG. 9 with a focus on differences from the first embodiment. Parts having the same functions as those in the first embodiment are given the same reference numerals. FIG. 9 is a configuration diagram in a cross section of the image sensor support mechanism to which the third embodiment is applied in a plane that passes through the imaging center and is parallel to the second direction y and the third direction z.

  The second support member 120 sandwiched between the movable portion 20 and the second base plate 36 is formed in a spherical shape. A surface of the second base plate 36 corresponding to the second support member 120 is attached so as to be parallel to the imaging surface of the imaging element 48. The second support member 120 is in contact with the second base plate 36 and the second bottom surface 28 and can roll.

  According to the configuration as described above, the movable unit 20 is fixed in the first direction x in a state where the movable unit 20 can rotate around the straight line parallel to the first direction x, the second direction y, and the third direction z. It can be supported by the part 30. Furthermore, since the second support member 120 rolls on the second base plate 36 and the second bottom surface 28 when the movable portion 20 moves in a plane, the second support member 12 is moved to the second bottom surface as in the first embodiment. Compared with the case of sliding at 28, there is also an advantage in that the load for moving the movable portion 20 is reduced.

  Next, an image sensor support mechanism to which the fourth embodiment is applied will be described. In 4th Embodiment, the structure of a 2nd supporting member and a 2nd fixing | fixed part differs from 1st Embodiment. Hereinafter, the fourth embodiment will be described with reference to FIG. 10 with a focus on differences from the first embodiment. Parts having the same functions as those in the first embodiment are given the same reference numerals. FIG. 10 is a configuration diagram in a cross section of the imaging element support mechanism to which the fourth embodiment is applied in a plane that passes through the imaging center and is parallel to the second direction y and the third direction z.

  The biasing member 13 is provided on the movable base 20 side of the second base plate 36. The biasing member 13 is a spring, for example. The second support member 12 is fixed to the spring 13. The spring 13 biases the second support member 12 in the third direction z, which is a direction in which the movable portion 20 is pressed. Note that even if the urging member 13 is an elastic member other than a spring, for example, rubber, the same effect as in the present embodiment is obtained.

Even with the configuration as described above, by pressing the second support member 12 against the movable portion 20, the movable portion 20 is moved between the first support members 11 _a , 11 _b , 11 _c , and the second support member 12. It is possible to support while preventing movement in the three directions z. Accordingly, displacement of the image sensor 48 in the third direction z is prevented, and accurate focus adjustment is performed.

  In the first to fourth embodiments, in order to support the movable portion so as to be movable in parallel in the first direction x and the second direction y, three on the side including the image sensor, opposite to the surface including the image sensor. Only one support member needs to be used on the side, and the number of components of the image sensor support mechanism can be smaller than that of the conventional support mechanism. In addition, since the configuration is simple, it is easy to reduce the overall size.

  In the first to fourth embodiments, the second support member substantially overlaps the center of gravity of the triangle surrounded by the three first support members when viewed from the third direction z, as viewed from the third direction z. The load is evenly distributed to each first support member. Therefore, the first support member can be easily rolled or slid, and the life of the first support member can be extended.

  In the first to fourth embodiments, the second fixing portion is fixed to the first fixing portion, but the second fixing portion does not need to be directly fixed to the first fixing portion. For example, the relative position of the second fixing part with respect to the first fixing part may be fixed so that the first fixing part and the second fixing part are fixed to the camera body.

  In the first, second, and fourth embodiments, the second support member is fixed to the second base plate. However, the second support member is fixed to the movable portion, and the second support member contacts the second base plate. It may be configured. In the case of a configuration that is fixed to the movable unit 20, it is preferable that a recess having a bottom surface parallel to the imaging surface is formed on the second base plate. Furthermore, it is preferable that the tip of the second support member on the second base plate side is formed in a convex spherical shape and abuts on the bottom surface of the recess.

  In the first to fourth embodiments, the range in which the first support member on the first base plate or the support receiving plate abuts or is fixed is a plane parallel to the imaging surface, but is not parallel. Even if it is a case, the effect of this invention mentioned above is acquired. Similarly, the range in which the second base plate or the second support member on the plate abuts or is fixed is a plane parallel to the imaging surface, but the above-described effects of the present invention can be obtained even if the plane is not parallel. It is done.

  In the first to fourth embodiments, the range in which the first support member on the first base plate or the support receiving plate abuts or is fixed is a plane parallel to the imaging surface, but is fixed. Need not be formed in a planar shape, and the above-described effects of the present invention can be obtained.

It is an external view of a camera having an image blur correction function using a stage mechanism to which the first to fourth embodiments of the present invention are applied. It is a circuit diagram which shows the electrical structure of the camera which has an image blurring correction function using the stage mechanism to which the 1st-4th embodiment is applied. It is a block diagram of the image pick-up element support mechanism to which the 1st-4th embodiment is applied. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. It is sectional drawing along the VV line of FIG. It is a figure for demonstrating arrangement | positioning of the 2nd support member with respect to the 1st support member seen from the 3rd direction z. It is xy top view for demonstrating the method of calculating | requiring the position of the point P from the position of two 1st directions, and the position of one 2nd direction. It is a block diagram of the image pick-up element support mechanism to which 2nd Embodiment is applied. It is a block diagram of the image pick-up element support mechanism to which 3rd Embodiment is applied. It is a block diagram of the image pick-up element support mechanism to which 4th Embodiment is applied.

Explanation of symbols

10 imaging device support mechanism _{11 a ~11 c, 110 a ~110} c first supporting member 12 second supporting member 20 movable portion 22 movable substrate 24 supporting the receiving plate 24 _a to 24 _c first contact planar portion 27 hole 28 second 2 bottom surface 30 first fixing portion 33 first base plate 34 first bottom surface 35 first inner wall surface 36 second base plate 48 imaging element 60 camera 64 imaging unit

Claims (16)

A first fixing part;
A second fixing portion whose position is fixed relative to the first fixing portion;
A movable part that is disposed between the first fixed part and the second fixed part, and in which an imaging element is provided on a surface facing the first fixed part;
It is sandwiched between the first fixed part and the movable part, abuts against one or both of the first fixed part and the movable part, and is arranged two-dimensionally in the first fixed part and the movable part. Three or more first support members,
First support figures formed by the respective first support members sandwiched between the second fixed part and the movable part and arranged two-dimensionally when viewed from a direction perpendicular to the imaging surface of the imaging element And a single second support member that is in contact with either one or both of the second fixed part and the movable part.   The imaging element support mechanism according to claim 1, wherein the first support member is formed in a spherical shape.   The imaging device support mechanism according to claim 1, wherein the first support member is fixed to one of the first fixed portion and the movable portion.   The imaging device support mechanism according to claim 3, wherein the first support member is fixed by being integrally formed with one of the first fixed portion and the movable portion.   5. The image sensor support mechanism according to claim 3, wherein a portion of the first support member that contacts the first fixed portion or the movable portion is formed in a convex spherical shape. 6.   Either one or both of the first fixed part and the movable part have a first abutting plane member that is parallel to the imaging surface and faces each of the first supporting members, and each of the first abutting parts. The imaging element support mechanism according to claim 1, wherein the first support member abuts on a planar member.   Each of the first abutting flat members has a first inner wall surface, and in a state where the first supporting member is in contact with the first abutting flat member, the first supporting member is the first inner wall surface. The image sensor support mechanism according to claim 6, wherein the image sensor support mechanism is surrounded by   The imaging device support mechanism according to claim 1, wherein the second support member is formed in a spherical shape.   The imaging device support mechanism according to claim 1, wherein the second support member is fixed to one of the second fixed portion and the movable portion.   The imaging device support mechanism according to claim 9, wherein the second support member is fixed by being integrally formed with one of the second fixed portion and the movable portion.   The imaging element support mechanism according to claim 9 or 10, wherein a portion of the second support member that contacts the second fixed portion or the movable portion is formed in a convex spherical shape.   Either one or both of the second fixed part and the movable part have a second abutting plane member parallel to the imaging surface, and the second support member abuts on the second abutting plane member. The imaging element support mechanism according to claim 1, wherein:   The second contact flat member has a second inner wall surface, and the second support member is surrounded by the second inner wall surface in a state where the second support member is in contact with the second contact flat member. The imaging element support mechanism according to claim 12, wherein   The imaging device support mechanism according to claim 1, wherein the second fixed portion has elasticity and biases the second support member in a direction in which the second support member is pressed against the movable portion.   The imaging element support mechanism according to claim 1, further comprising an elastic body that is provided on the second fixed portion or the movable portion and biases the second support member in a direction in which the second support member is pressed against the movable portion. The vicinity of the center of the imaging element on the imaging surface, the center of gravity of the first support graphic, and the center of gravity of the second support member on the side facing the movable portion overlap when viewed from a direction perpendicular to the imaging surface. The imaging device support mechanism according to claim 1, wherein:

Images