JP2009151063A - Blur correction mechanism, lens barrel, and imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the detection accuracy of the movement position of a lens. <P>SOLUTION: The blur correction mechanism includes: a base frame 12; a first correction moving frame 13 which is supported to be freely movable in a first direction orthogonal to an optical axis by the base frame; a second correction moving frame 14 which is supported to be freely movable in a second direction orthogonal to the first correction moving frame and the optical axis; a first position detecting element 39 which is located in the central part of a first driving coil 38 located to face a first driving magnet 19 and detects the movement position of the lens in the first direction; and a second position detecting element 41 which is located in the central part of a second driving coil 40 located to face a second driving magnet 21 and detects the movement position of the lens in the second direction. The second correction moving frame 14 includes a first positioning part 33 which holds the first position detecting element 39, in such a state that it is held from both sides in the first direction and a second positioning part 36 which holds the second position detecting element 41, in such a state that it is held from both sides in the second direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technical field of a blur correction mechanism, a lens barrel, and an imaging device. Specifically, the position detection element positioned at the center of the coil is positioned and attached to the correction moving frame that holds the lens, thereby improving the position accuracy of the position detection element with respect to the drive magnet, and the lens or photoelectric conversion element. The present invention relates to a technical field that aims to improve the detection accuracy related to the movement position of an object.

  Some imaging devices such as a video camera and a still camera are provided with a blur correction mechanism that performs a blur correction by moving a lens or a photoelectric conversion element in a direction orthogonal to the optical axis.

  Such a blur correction mechanism is provided with a base frame (fixed frame) and two correction moving frames (movable frames) movable in a direction perpendicular to the optical axis with respect to the base frame. Each of the moving frames is guided by a guide shaft and moved in two different directions orthogonal to the optical axis to perform blur correction.

  In the blur correction mechanism, the positions of the blur correction lens or the photoelectric conversion element in the two directions are detected, respectively, and the image blur is canceled in accordance with the detected position of the blur correction lens or the photoelectric conversion element. Two correction moving frames are moved. Therefore, in the blur correction mechanism, a position detection element for detecting the movement position of the lens or the photoelectric conversion element, for example, a hall element or a light emitting body that performs position detection using a change in magnetic flux density of the magnet is emitted. An optical position sensor or the like that performs position detection using detection light is provided (for example, see Patent Document 1).

  In some conventional imaging apparatuses, a position detection element is bonded to a circuit board such as a flexible printed wiring board together with a driving coil.

  Such a position detection element is, for example, one that is arranged by being bonded to a circuit board so as to be positioned at the center of the driving coil, and being positioned and attached to one correction moving frame. .

  In some cases, the position detection element is bonded to the circuit board so as to be positioned outside the drive coil, and the position detection element is positioned and attached to one correction moving frame.

JP 2007-17957 A

  However, as a method of arranging the position detection elements described above, in the type in which the circuit board is arranged by being positioned and attached to one correction moving frame, the position accuracy of the position detection elements with respect to the drive magnet is high. Since it depends on the positional accuracy of the circuit board with respect to the correction moving frame, there is a problem that the positional accuracy of the position detection element with respect to the boundary line between the poles of the driving magnet (N pole and S pole) is low.

  Further, as a method of arranging the position detection elements described above, in the type in which the position detection elements are arranged by being positioned and attached to one correction moving frame, the position detection elements are arranged outside the driving coil. Therefore, there is a problem that the detection accuracy is lowered due to the influence of the guide shaft that guides the two correction moving frames in two directions orthogonal to the optical axis and the backlash of the bearing.

  Therefore, the blur correction mechanism, the lens barrel, and the imaging apparatus of the present invention overcome the above-described problems, improve the position accuracy of the position detection element with respect to the drive magnet, and improve the detection accuracy related to the moving position of the lens or the photoelectric conversion element. The task is to improve.

  In order to solve the above-described problems, the blur correction mechanism, the lens barrel, and the imaging device include a base frame on which a first driving magnet and a second driving magnet are attached, and the optical axis on the base frame. A first correction moving frame supported so as to be movable in a first orthogonal direction, and the first correction moving frame moved in a second direction orthogonal to both the optical axis and the first direction. A second correction moving frame that is freely supported and holds a blur correction lens or photoelectric conversion element; a first driving coil positioned opposite to the first driving magnet; A first position detecting element that is positioned in the center of one driving coil and that detects a moving position of the lens or the photoelectric conversion element in the first direction; and opposed to the second driving magnet. A second driving coil located in front and A second position detecting element that is positioned at the center of the second driving coil and that detects a moving position of the lens or the photoelectric conversion element in the second direction, and the second correction moving frame. In addition, a first positioning unit that holds the first position detection element in a state of being sandwiched from both sides in the first direction, and a state in which the second position detection element is sandwiched from both sides in the second direction And a second positioning portion to be held at the position.

  Therefore, in the shake correction mechanism, the lens barrel, and the imaging device, the position detection element positioned at the center of the drive coil is positioned by the positioning unit on the second correction moving frame.

  In the blur correction mechanism, the lens barrel, and the imaging apparatus described above, the first position detection element is disposed on a line that passes through the optical axis and extends in the first direction, and passes through the optical axis in the second direction. It is desirable to arrange the second position detecting element on the extending line.

  With such a configuration, an error between the position detected by the first detection element and the second detection element and the movement position of the blur correction lens or the photoelectric conversion element is reduced.

  In the shake correction mechanism, the lens barrel, and the imaging device described above, it is preferable to use Hall elements as the first position detection element and the second position detection element.

  By using Hall elements as the first position detection element and the second position detection element, the first correction moving frame and the second correction moving frame are moved in the first direction and the second direction, respectively. The first driving magnet and the second driving magnet can be used for detecting the movement position of the blur correction lens or the photoelectric conversion element.

  Furthermore, in the blur correction mechanism, the lens barrel, and the imaging device described above, a magnet having N and S poles magnetized adjacent to each other in the first direction is used as the first driving magnet. As the drive magnet, a magnet having N and S poles magnetized adjacent to each other in the second direction is used, and current is supplied to both the first drive coil and the second drive coil. In the initial state, the first position detection is performed such that the center of the first position detection element in the first direction faces the boundary line between the north pole and the south pole of the first drive magnet. The second position is such that the element is positioned and the center of the second position detection element in the second direction is opposed to the boundary line between the north and south poles of the second drive magnet. Position the sensing element It may be so.

  By maintaining such a positional relationship between the magnet and the position detection element, a decrease in detection position accuracy due to variations in the influence of the magnetic field generated in the first drive magnet and the second drive magnet is suppressed.

  The blur correction mechanism of the present invention is a blur correction mechanism that performs blur correction by moving a lens or a photoelectric conversion element that receives light from the lens in a direction perpendicular to the optical axis, and includes a first driving magnet and a first driving magnet. A base frame to which two drive magnets are attached; a first correction moving frame supported by the base frame in a first direction perpendicular to the optical axis; and the first correction movement. A second correction moving frame that is supported by the frame so as to be movable in a second direction orthogonal to both the optical axis and the first direction, and that holds the blur correction lens or the photoelectric conversion element; A first driving coil positioned opposite to one driving magnet, and a movement position of the lens or the photoelectric conversion element in the first direction positioned at a central portion of the first driving coil; First position detecting element for detecting A second driving coil positioned opposite to the second driving magnet, and a second portion of the lens or the photoelectric conversion element positioned in the center of the second driving coil. A second position detecting element that detects the moving position of the first position, and holds the first position detecting element in the second correction moving frame in a state of being sandwiched from both sides in the first direction. And a second positioning unit for holding the second position detection element in a state of being sandwiched from both sides in the second direction.

  Accordingly, the positional accuracy of the first position detecting element with respect to the first driving magnet and the positional accuracy of the second position detecting element with respect to the second driving magnet are the positions of the flexible printed wiring board with respect to the second correction moving frame. The position accuracy of the first position detecting element and the second position detecting element with respect to the first driving magnet and the second driving magnet is improved without depending on the accuracy, and detection relating to the movement position for shake correction is performed. The accuracy can be improved.

  In the invention described in claim 2, the first position detecting element is disposed on a line extending in the first direction through the optical axis, and on a line extending in the second direction through the optical axis. Since the second position detection element is disposed in the position, the detection accuracy relating to the movement position of the blur correction lens or the photoelectric conversion element can be further improved.

  In the invention described in claim 3, since hall elements are used as the first position detecting element and the second position detecting element, the first correction moving frame and the second correction moving frame are used. The first driving magnet and the second driving magnet that respectively move the first and second driving magnets in the first direction and the second direction can be used for detecting the movement position of the blur correction lens or the photoelectric conversion element, The number of points can be reduced and the position detection mechanism can be simplified.

  In the invention described in claim 4, a magnet having N and S poles magnetized adjacent to each other in the first direction is used as the first driving magnet, and the second driving magnet is used. In the initial stage, no current is supplied to either the first driving coil or the second driving coil using a magnet having N and S poles adjacent to each other in the second direction. In the state, the first position detecting element is positioned so that the center of the first position detecting element in the first direction is opposed to the boundary line between the north pole and the south pole of the first driving magnet. In addition, the second position detection element is positioned so that the center of the second position detection element in the second direction faces the boundary line between the north pole and the south pole of the second drive magnet. Because the first drive A reduction in the accuracy of position detection due to variation of influence of the magnetic field generated in the magnet and the second driving magnet can be suppressed.

  The lens barrel of the present invention is a lens mirror in which a blur correction mechanism that performs blur correction by moving a lens or a photoelectric conversion element that receives light from the lens in a direction orthogonal to the optical axis is disposed inside the lens holding cylinder. The shake correction mechanism is a base frame to which a first drive magnet and a second drive magnet are attached, and is movable in a first direction perpendicular to the optical axis to the base frame. The first correction moving frame supported, and the first correction moving frame supported by the first correction moving frame so as to be movable in a second direction orthogonal to both the optical axis and the first direction, and a blur correction lens. Alternatively, a second correction moving frame holding the photoelectric conversion element, a first driving coil positioned opposite to the first driving magnet, and a central portion of the first driving coil. Located in the lens or the photoelectric conversion A first position detecting element for detecting a movement position of the child in the first direction; a second driving coil positioned opposite to the second driving magnet; and the second driving coil. A second position detecting element that is positioned at the center of the coil and detects a moving position of the lens or the photoelectric conversion element in the second direction, and the second correction moving frame includes the first correction moving frame. A first positioning portion that holds the position detecting element in a state of being sandwiched from both sides in the first direction, and a second that holds the second position detecting element in a state of being sandwiched from both sides in the second direction. The positioning portion is provided.

  Accordingly, the positional accuracy of the first position detecting element with respect to the first driving magnet and the positional accuracy of the second position detecting element with respect to the second driving magnet are the positions of the flexible printed wiring board with respect to the second correction moving frame. The position accuracy of the first position detecting element and the second position detecting element with respect to the first driving magnet and the second driving magnet is improved without depending on the accuracy, and detection relating to the movement position for shake correction is performed. The accuracy can be improved.

  In the invention described in claim 6, the first position detecting element is arranged on a line extending in the first direction through the optical axis, and on a line extending in the second direction through the optical axis. Since the second position detection element is disposed in the position, the detection accuracy relating to the movement position of the blur correction lens or the photoelectric conversion element can be further improved.

  In the invention described in claim 7, since hall elements are used as the first position detecting element and the second position detecting element, the first correction moving frame and the second correction moving frame are used. The first driving magnet and the second driving magnet that respectively move the first and second driving magnets in the first direction and the second direction can be used for detecting the movement position of the blur correction lens or the photoelectric conversion element, The number of points can be reduced and the position detection mechanism can be simplified.

  In the invention described in claim 8, a magnet in which N pole and S pole are magnetized adjacent to each other in the first direction is used as the first driving magnet, and the second driving magnet is used. In the initial stage, no current is supplied to either the first driving coil or the second driving coil using a magnet having N and S poles adjacent to each other in the second direction. In the state, the first position detecting element is positioned so that the center of the first position detecting element in the first direction is opposed to the boundary line between the north pole and the south pole of the first driving magnet. In addition, the second position detection element is positioned so that the center of the second position detection element in the second direction faces the boundary line between the north pole and the south pole of the second drive magnet. Because the first drive A reduction in the accuracy of position detection due to variation of influence of the magnetic field generated in the magnet and the second driving magnet can be suppressed.

  The imaging apparatus according to the present invention includes a lens barrel in which a blur correction mechanism that performs blur correction by moving a lens or a photoelectric conversion element that receives light from the lens in a direction perpendicular to the optical axis is disposed inside the lens holding cylinder. The shake correction mechanism includes a base frame to which a first drive magnet and a second drive magnet are attached, and a first direction perpendicular to the optical axis of the base frame. A first correction moving frame that is movably supported by the first correction frame, and a first correction moving frame that is movably supported in a second direction that is orthogonal to the optical axis and the first direction. A blur correction lens or a second correction moving frame holding the photoelectric conversion element, a first drive coil positioned opposite to the first drive magnet, and the first drive coil Located in the center of the lens or A first position detecting element for detecting a movement position of the photoelectric conversion element in the first direction; a second driving coil positioned opposite to the second driving magnet; and the second And a second position detection element that detects a movement position of the lens or the photoelectric conversion element in the second direction. A first positioning portion that holds the first position detection element in a state of being sandwiched from both sides in the first direction, and a state of holding the second position detection element in a state of being sandwiched from both sides in the second direction And a second positioning portion.

  Accordingly, the positional accuracy of the first position detecting element with respect to the first driving magnet and the positional accuracy of the second position detecting element with respect to the second driving magnet are the positions of the flexible printed wiring board with respect to the second correction moving frame. The position accuracy of the first position detecting element and the second position detecting element with respect to the first driving magnet and the second driving magnet is improved without depending on the accuracy, and detection relating to the movement position for shake correction is performed. The accuracy can be improved.

  In the invention described in claim 10, the first position detecting element is disposed on a line extending in the first direction through the optical axis, and on a line extending in the second direction through the optical axis. Since the second position detection element is disposed in the position, the detection accuracy relating to the movement position of the blur correction lens or the photoelectric conversion element can be further improved.

  In the invention described in claim 11, since hall elements are used as the first position detecting element and the second position detecting element, the first correction moving frame and the second correction moving frame are used. The first driving magnet and the second driving magnet that respectively move the first and second driving magnets in the first direction and the second direction can be used for detecting the movement position of the blur correction lens or the photoelectric conversion element, The number of points can be reduced and the position detection mechanism can be simplified.

  In a twelfth aspect of the present invention, a magnet having N and S poles magnetized adjacent to each other in the first direction is used as the first driving magnet, and the second driving magnet is used. In the initial stage, no current is supplied to either the first driving coil or the second driving coil using a magnet having N and S poles adjacent to each other in the second direction. In the state, the first position detecting element is positioned so that the center of the first position detecting element in the first direction is opposed to the boundary line between the north pole and the south pole of the first driving magnet. In addition, the second position detection element is positioned so that the center of the second position detection element in the second direction faces the boundary line between the north pole and the south pole of the second drive magnet. The first WD A reduction in the accuracy of position detection due to variations in the influence of the magnetic field generated in use magnet and a second drive magnet can be suppressed.

  The best mode for carrying out the blur correction mechanism, the lens barrel, and the image pickup apparatus of the present invention will be described below with reference to the accompanying drawings.

  In the best mode described below, the imaging apparatus of the present invention is applied to a video camera, the lens barrel of the present invention is applied to a lens barrel provided in the video camera, and the blur correction mechanism of the present invention is applied to the video camera. This is applied to the provided blur correction mechanism.

  Note that the scope of application of the imaging device, lens barrel, and shake correction mechanism of the present invention is not limited to a video camera or a lens barrel and shake correction mechanism provided in the video camera. For example, a still camera, a mobile phone, etc. The present invention can be widely applied to various imaging devices incorporated in other devices or lens barrels and blur correction mechanisms provided in the imaging devices.

  In the following description, it is assumed that the front, rear, top, bottom, left, and right directions are shown as viewed from the photographer when the video camera is photographed. Therefore, the subject side is the front and the photographer side is the rear.

  In addition, the front and rear, up and down, left and right directions shown below are for convenience of explanation, and the implementation of the present invention is not limited to these directions.

  Moreover, each lens shown below is meant to include both a lens constituted by a single lens and a lens group constituted by a plurality of lenses.

  As shown in FIG. 1, the imaging apparatus (video camera) 1 is configured by arranging a lens barrel 3 inside an outer casing 2. Various operation knobs such as a zoom knob (not shown), a shutter button for taking a still image, a power dial, and a mode switching dial for switching between a recording mode and a reproduction mode are arranged in the outer casing 2.

  The lens barrel 3 is formed by, for example, arranging or attaching necessary parts inside and outside a lens holding cylinder 4 that is formed long in the front and rear directions (see FIGS. 1 and 2).

  The lens barrel 3 includes a first lens 5, a second lens 6, a third lens 7, a fourth lens 8, and a fifth lens 9 arranged in order from the front to the rear. For example, the first lens 5, the third lens 7, and the fifth lens 9 are lenses fixed with respect to the optical axis, and the second lens 6 and the fourth lens 8 are lenses that are movable in the optical axis direction. is there. The second lens 6 functions as, for example, a zoom lens, and the fourth lens 8 functions as, for example, a focus lens.

  The fifth lens 9 includes, for example, a front lens 9a, a shake correction lens 9b, and a rear lens 9c, and the shake correction lens 9b is movable in two directions orthogonal to the optical axis direction (front-rear direction). Yes.

  A photoelectric conversion element 10, for example, a CCD (Charge Coupled Device) is disposed behind the fifth lens 9.

  Hereinafter, the blur correction mechanism 11 having the front lens 9a and the blur correction lens 9b will be described (see FIGS. 3 to 10).

  As shown in FIGS. 3 and 4, the blur correction mechanism 11 includes a base frame 12, a first correction moving frame 13 supported by the base frame 12 so as to be movable in the left-right direction (first direction), and the first correction moving frame 13. The first correction moving frame 13 has a second correction moving frame 14 supported so as to be movable in the vertical direction (second direction).

  The base frame 12 has a front surface portion 15 and a peripheral wall portion 16 protruding rearward from the outer peripheral portion of the front surface portion 15 (see FIG. 3). Accordingly, a space opened rearward is formed in the base frame 12, and this space is formed as the arrangement recess 17.

  The front lens 9 a is held at a substantially central portion of the front surface portion 15. As shown in FIG. 4, first shaft holding portions 15 a and 15 a and first sub shaft holding portions 15 b and 15 b are provided on the back surface of the front surface portion 15 so as to be separated from each other in the vertical direction. The first shaft holding portions 15a and 15a and the first sub shaft holding portions 15b and 15b are provided separately from each other on the left and right.

  A first yoke 18 and a first driving magnet 19 joined to the rear surface of the first yoke 18 are attached to the left end of the back surface of the front surface portion 15 (see FIGS. 3 and 4). The first drive magnet 19 is formed by, for example, magnetizing N and S poles to the left and right.

  A second yoke 20 and a second driving magnet 21 joined to the rear surface of the second yoke 20 are attached to the upper end of the back surface of the front surface portion 15. The second drive magnet 21 is formed by, for example, N and S poles being vertically magnetized.

  The first correction moving frame 13 is supported by the base frame 12 through the first guide shaft 22 and the first sub guide shaft 23 so as to be movable in the left-right direction (first direction).

  The first correction moving frame 13 has a transmission opening 13a at the center.

  The first correction moving frame 13 is provided with first bearing portions 24, 24 that are separated from each other at the upper end portion in the left-right direction, and the first sub-bearing portion 25 is provided at the lower end portion. The first correction moving frame 13 is provided with second shaft holding portions 26 and 26 that are vertically spaced apart at the left end portion, and second sub shaft holding portions 27 and 27 that are vertically spaced apart at the right end portion. Is provided.

  In the first correction moving frame 13, the first bearing portions 24, 24 are slidably supported on the first guide shaft 22, and the first sub-bearing portion 25 is slid on the first sub-guide shaft 23. It is supported movably. Both ends of the first guide shaft 22 that supports the first bearing portions 24 and 24 are respectively attached to the first shaft holding portions 15a and 15a of the base frame 12 by press-fitting or the like. Both ends of the first sub-guide shaft 23 that supports the first sub-bearing portion 25 are attached and held by the first sub-axis holding portions 15b and 15b of the base frame 12 by press-fitting or the like.

  Accordingly, the first correction moving frame 13 is slid with respect to the first guide shaft 22 and the first sub guide shaft 23 and moved in the left-right direction.

  The second correction moving frame 14 is supported by the first correction moving frame 13 via the second guide shaft 28 and the second sub guide shaft 29 so as to be movable in the vertical direction (second direction). .

  The blur correction lens 9b is held in the center of the second correction moving frame 14.

  The second correction moving frame 14 is provided with second bearing portions 30 and 30 that are vertically spaced apart at the left end portion, and a second sub-bearing portion 31 is provided at the right end portion.

  In the second correction moving frame 14, the second bearing portions 30, 30 are slidably supported by the second guide shaft 28, and the second sub-bearing portion 31 is slid on the second sub-guide shaft 29. It is supported movably. Both ends of the second guide shaft 28 that supports the second bearing portions 30 and 30 are attached to the second shaft holding portions 26 and 26 of the first correction moving frame 13 by press-fitting and held. The The second sub-guide shaft 29 that supports the second sub-bearing portion 31 has both ends attached to the second sub-axis holding portions 27 and 27 of the first correction moving frame 13 by press fitting or the like. Is done.

  Therefore, the second correction moving frame 14 holding the blur correction lens 9b is slid with respect to the second guide shaft 28 and the second sub guide shaft 29 and moved in the vertical direction. Note that the second correction moving frame 14 is moved in the left-right direction integrally with the first correction moving frame 13 moved in the left-right direction with respect to the base frame 12.

  The second correction moving frame 14 is provided with a first coil mounting portion 32 protruding rearward (see FIGS. 4 to 6). The first coil mounting portion 32 is provided at the left end portion of the second correction moving frame 14 and includes a pair of base portions 32a and 32a formed in a vertically long and substantially rectangular shape that are spaced apart from each other in the vertical direction. ing. As shown in FIG. 7, a concave portion 32b opened forward is formed on the front side of the first coil mounting portion 32, and a part of the first driving magnet 19 is disposed in the concave portion 32b. .

  The second correction moving frame 14 is provided with a first positioning portion 33 between the base portions 32a and 32a. The first positioning portion 33 includes a pair of positioning protrusions 34 and 34 that are spaced apart from each other on the left and right. Opposing portions of the positioning protrusions 34 and 34 are formed as substantially semicircular holding portions 34a and 34a, respectively. As shown in FIG. 8, a boundary line 19a between the north pole and the south pole of the first drive magnet 19 is positioned between the sandwiching portions 34a and 34a.

  The second correction moving frame 14 is provided with a second coil mounting portion 35 protruding rearward (see FIGS. 4 to 6). The second coil mounting portion 35 is provided at the upper end portion of the second correction moving frame 14, and is configured by a pair of base portions 35a and 35a formed in a horizontally long and substantially rectangular shape spaced apart from the left and right. ing. As shown in FIG. 7, a concave portion 34b opened forward is formed on the front side of the second coil attachment portion 35, and a part of the second driving magnet 21 is disposed in the concave portion 34b. .

  The second correction moving frame 14 is provided with a second positioning portion 36 between the base portions 35a and 35a. The second positioning portion 36 includes a pair of positioning projections 37 and 37 that are spaced apart from each other in the vertical direction. Opposing portions of the positioning protrusions 37 and 37 are formed as substantially semicircular holding portions 37a and 37a, respectively. As shown in FIG. 8, a boundary line 21a between the N pole and the S pole of the second drive magnet 21 is positioned between the sandwiching portions 37a and 37a.

  A first drive coil 38 and a first position detection element 39 are positioned and attached to the left end of the second correction moving frame 14 (see FIGS. 5, 6, and 9).

  The first driving coil 38 is formed in a vertically long annular shape.

  The first position detection element 39 has a function of detecting a movement position in the left-right direction (first direction) of the blur correction lens 9b held by the second correction moving frame 14, for example, a rectangular parallelepiped. The first drive coil 38 is formed at the center of the first drive coil 38. As the first position detection element 39, for example, a Hall element that performs position detection using a change in magnetic flux density of the first drive magnet 19 is used. The first position detection element 39 is not limited to a Hall element. For example, as the first position detection element 39, an optical position sensor that performs position detection using detection light emitted from a light emitter, or the like. Can be used.

  The first position detection element 39 is inserted from the rear between the positioning protrusions 34, 34 of the first positioning portion 33, and the left and right side surfaces 39a, 39a are sandwiched (see FIG. 8). The first drive coil 38 is disposed on the first coil attachment portion 32 so as to be fitted on the second correction moving frame 14 (see FIGS. 7 and 9). The first position detecting element 39 is positioned with respect to the second correction moving frame 14 by being sandwiched between the positioning protrusions 34, 34, and the first driving coil 38 is attached to the first coil mounting portion 32. It is positioned with respect to the second correction moving frame 14 by being arranged in an outer fitting shape.

  When the first position detection element 39 is positioned with respect to the second correction moving frame 14, in the initial state in which no current is supplied to the first driving coil 38, as shown in FIG. The center of one position detection element 39 in the left-right direction is positioned so as to oppose the boundary line 19a between the north and south poles of the first drive magnet 19.

  A second drive coil 40 and a second position detection element 41 are positioned and attached to the upper end of the second correction moving frame 14 (see FIGS. 5, 6, and 10).

  The second driving coil 40 is formed in a horizontally long annular shape.

  The second position detection element 41 has a function of detecting a movement position in the vertical direction (second direction) of the blur correction lens 9b held by the second correction moving frame 14, for example, a rectangular parallelepiped. And is located at the center of the second drive coil 40. As the second position detection element 41, for example, a Hall element that performs position detection using a change in magnetic flux density of the second drive magnet 19 is used. The second position detection element 41 is not limited to a Hall element. For example, as the second position detection element 41, an optical position sensor that performs position detection using detection light emitted from a light emitter, or the like. Can be used.

  The second position detecting element 41 is inserted from the rear between the positioning protrusions 37, 37 of the second positioning portion 36, and the upper and lower side surfaces 41a, 41a are sandwiched (see FIG. 8). The second drive coil 40 is disposed on the second coil mounting portion 35 so as to be fitted on the second correction moving frame 14 (see FIGS. 7 and 10). The second position detecting element 41 is positioned with respect to the second correction moving frame 14 by being sandwiched between the positioning protrusions 37, 37, and the second driving coil 40 is connected to the second coil mounting portion 35. It is positioned with respect to the second correction moving frame 14 by being arranged in an outer fitting shape.

  When the second position detecting element 41 is positioned with respect to the second correction moving frame 14, in the initial state where no current is supplied to the second driving coil 40, as shown in FIG. The center of the second position detection element 41 in the vertical direction is positioned so as to oppose the boundary line 21a between the N pole and the S pole of the second drive magnet 21.

  A flexible printed wiring board 42 is attached to a predetermined position of the second correction moving frame 14 (see FIG. 3). The flexible printed wiring board 42 is connected to a power supply circuit (not shown).

  In the circuit pattern of the flexible printed wiring board 42, the first driving coil 38, the first position detecting element 39, the second driving coil 40, and the second position detecting element 41 are electrically connected by solder or the like. Fixed.

  A counter yoke 43 is attached to the base frame 12 from the rear side. The counter yoke 43 plays a role of forming a closed magnetic path together with the first yoke 18, the first drive magnet 19, the second yoke 20 and the second drive magnet 21.

  In the shake correction mechanism 11, when a drive current is supplied to the first drive coil 38, a thrust in a direction corresponding to the direction of the magnetic flux generated in the first drive magnet 19 and the direction of the supplied drive current. Occurs, and the first correction moving frame 13 is guided to the first guide shaft 22 and the first sub guide shaft 23 together with the second correction moving frame 14 holding the blur correction lens 9b. Then, it is moved in the left-right direction to perform blur correction. At this time, the strength of the magnetic force of the first drive magnet 19 is detected by the first position detection element 39 at any time, and a detection signal corresponding to the strength of the magnetic force is output to move the blur correction lens 9b. The position is detected, and a drive current is supplied to the first drive coil 38 so that the blur correction lens 9b is moved in a direction in which image blur is canceled according to the detected movement position of the blur correction lens 9b. Is done.

  Note that the occurrence state of camera shake, vibration, and the like in the imaging apparatus 1 is detected by, for example, a shake detection mechanism such as a gyro sensor.

  On the other hand, when a drive current is supplied to the second drive coil 40, a thrust is generated in a direction corresponding to the direction of the magnetic flux generated in the second drive magnet 21 and the direction of the supplied drive current, The second correction moving frame 14 holding the blur correction lens 9b is guided by the second guide shaft 28 and the second sub guide shaft 29 and moved in the vertical direction to perform blur correction. At this time, the strength of the magnetic force of the second drive magnet 21 is detected by the second position detection element 41 at any time, and a detection signal corresponding to the strength of the magnetic force is output to move the blur correction lens 9b. The position is detected, and a drive current is supplied to the second drive coil 40 so that the blur correction lens 9b is moved in a direction in which image blur is canceled according to the detected movement position of the blur correction lens 9b. Is done.

  As described above, in the imaging apparatus 1, the base frame 12 to which the first driving magnet 19 and the second driving magnet 21 are attached, and the base frame 12 can be moved in the first direction. The first correction moving frame 13 supported by the first correction moving frame 13 and the second correction moving frame supported by the first correction moving frame 13 so as to be movable in the second direction and holding the blur correction lens 9b. The frame 14, the first driving coil 38 that is positioned opposite to the first driving magnet 19, and the first of the blur correction lens 9 b that is positioned in the center of the first driving coil 38. A first position detecting element 39 for detecting a moving position in the direction, a second driving coil 40 positioned opposite to the second driving magnet 21, and the center of the second driving coil 40 In the second direction of the blur correction lens 9b A first position detecting element for detecting a moving position is provided, and the first position detecting element 39 is held in the second correction moving frame 14 while being sandwiched from both sides in the first direction. A positioning unit 33 and a second positioning unit 36 that holds the second position detection element 41 in a state of being sandwiched from both sides in the second direction are provided.

  Accordingly, the first position detecting element 39 positioned at the center of the first driving coil 38 and the second position detecting element 41 positioned at the center of the second driving coil 40 are used for position detection. The first position detection is carried out by the first positioning portion 33 and the second positioning portion 36 provided on the second correction moving frame 14 that holds the blur correction lens 9b that is the target of the first position detection. The positional accuracy of the element 39 with respect to the first driving magnet 19 and the positional accuracy of the second position detection element 41 with respect to the second driving magnet 21 are the positional accuracy of the flexible printed wiring board 42 with respect to the second correction moving frame 14. The first position detection element for the boundary lines 19a and 21a between the poles of the first drive magnet 19 and the second drive magnet 21 (N pole and S pole), respectively. Improved 39 and the positional accuracy of the second position detecting element 41, it is possible to improve the detection accuracy on the movement position of the vibration reduction lens 9b.

  In addition, since the first position detection element 39 is positioned at the center of the first drive coil 38 and the second position detection element 41 is positioned at the center of the second drive coil 40, the first It is not necessary to provide an arrangement space for the position detection element 39 and the second position detection element 41 outside the first drive coil 38 and the second drive coil 40, respectively, and a shake correction mechanism by effectively using the arrangement space 11 can be miniaturized.

  Further, in the imaging apparatus 1, the first position detection element 39 is disposed on a line extending in the first direction through the optical axis, and the second position detection is performed on a line extending in the second direction through the optical axis. Since the element 41 is disposed, it is possible to improve the detection accuracy related to the movement position of the blur correction lens 9b.

  Furthermore, since Hall elements are used as the first position detecting element 39 and the second position detecting element 41, the first correction moving frame 13 and the second correction moving frame 14 are respectively set in the first direction. The first driving magnet 19 and the second driving magnet 21 operated in the second direction can be used for detecting the movement position of the blur correction lens 9b, reducing the number of parts and the position detection mechanism. Simplification can be achieved.

  In addition, in the initial state where no current is supplied to any of the first drive coil 38 and the second drive coil 40, the center of the first position detection element 39 in the first direction is the first. The first position detection element 39 is positioned so as to face the boundary line 19a between the N pole and the S pole of the drive magnet 19, and the center of the second position detection element 41 in the second direction is the second drive. The second position detection element 41 is positioned so as to face the boundary line 21a between the north pole and the south pole of the magnet 21 for the magnetic field, so that the magnetic field generated in the first driving magnet 19 and the second driving magnet 21 It is possible to suppress a decrease in the accuracy of the detection position due to variations in the influence of the above.

  In the imaging apparatus 1, as described above, the first coil attachment portion 32 and the second coil attachment portion 35 are provided in the second correction moving frame 14, and the first drive coil 38 is provided. And the second driving coil 40 are positioned so that the first position detecting element 39 and the second position detecting element 41, the first driving coil 38 and the second driving coil 40 are Positioned on the same member, the positional accuracy of the first driving coil 38 relative to the first position detecting element 39 is improved and the positional accuracy of the second driving coil 40 relative to the second position detecting element 41 is improved. be able to.

  Further, since the first drive coil 38 and the second drive coil 40 are positioned in the second correction moving frame 14, the distance between the first drive magnet 19 and the first drive coil 38 and The positional accuracy of the distance between the second drive magnet 21 and the second drive coil 40 can be improved.

  Note that the first driving coil 38, the second driving coil 40, the first position detecting element 39, and the second position detecting element 41 respectively positioned on the second correction moving frame 14 are, for example, It is fixed to the second correction moving frame 14 by bonding. By fixing the first driving coil 38, the second driving coil 40, the first position detecting element 39 and the second position detecting element 41 to the second correction moving frame 14 by bonding, the temperature change When the second correction moving frame 14 is expanded or contracted due to an environmental change such as the first driving coil 38, the second driving coil 40, the first position detecting element 39, and the second It is possible to prevent the position detection element 41 from falling off from the second correction moving frame 14.

  In the above description, the shake correction lens 9b is held on the second correction moving frame 14, and the position of the shake correction lens 9b is detected by moving the second correction moving frame 14 in a direction perpendicular to the optical axis. As an example, the blur correction mechanism, the lens barrel, and the imaging device that perform the blur correction are shown, but the application range of the present invention is that in which the second correction moving frame 14 holds the blur correction lens 9b. The present invention is not limited, and the photoelectric conversion element is held in the second correction moving frame 14 instead of the blur correction lens 9b, and the second correction moving frame 14 is moved in the direction orthogonal to the optical axis. Thus, the present invention can be applied to a blur correction mechanism, a lens barrel, and an imaging device that perform blur correction by detecting the position of the photoelectric conversion element. In the type in which the photoelectric conversion element is held in the second correction moving frame 14, the photoelectric conversion element 10 at the rear end portion of the lens holding tube 4 is not necessary.

  The specific shapes and structures of the respective parts shown in the above-described best mode are merely examples of the implementation of the present invention, and the technical scope of the present invention is limited by these. It should not be interpreted in a general way.

2 to 10 show the best mode of the present invention, and this figure is a perspective view of an imaging apparatus. It is a schematic sectional drawing of an imaging device. It is a disassembled perspective view of a shake correction mechanism. It is a general | schematic expanded rear view of the blurring correction | amendment mechanism shown in the state which abbreviate | omitted the opposing yoke and the flexible printed wiring board. It is a general | schematic expansion perspective view of the blurring correction | amendment mechanism shown in the state which abbreviate | omitted some members. It is a general | schematic expansion perspective view of the blurring correction | amendment mechanism shown in the state which abbreviate | omitted some members and removed the position detection element and the drive coil. It is an expanded sectional view which follows the VII-VII line of FIG. It is an expanded sectional view which follows the VIII-VIII line of FIG. FIG. 6 is an enlarged perspective view showing a state where the first driving coil and the first position detection element are positioned on a second correction moving frame. FIG. 6 is an enlarged perspective view showing a state in which a second drive coil and a second position detection element are positioned on a second correction moving frame.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Imaging device, 3 ... Lens barrel, 4 ... Lens holding cylinder, 5 ... 1st lens, 6 ... 2nd lens, 7 ... 3rd lens, 8 ... 4th lens, 9 ... 5th lens, 9b ... Blur Correction lens, 10 ... photoelectric conversion element, 11 ... blur correction mechanism, 12 ... base frame, 13 ... first correction movement frame, 14 ... second correction movement frame, 19 ... first magnet, 19a ... Boundary line, 21 ... second magnet, 21a ... border line, 33 ... first positioning portion, 36 ... second positioning portion, 38 ... first driving coil, 39 ... first position detecting element, 40 ... Second driving coil, 41 ... Second position detecting element

Claims (12)

A blur correction mechanism that performs blur correction by moving a lens or a photoelectric conversion element that receives light from the lens in a direction perpendicular to the optical axis,
A base frame to which a first drive magnet and a second drive magnet are attached;
A first correction moving frame supported by the base frame so as to be movable in a first direction orthogonal to the optical axis;
A second correction that is supported by the first correction moving frame so as to be movable in a second direction orthogonal to both the optical axis and the first direction, and that holds the blur correction lens or the photoelectric conversion element. Moving frame for
A first drive coil positioned opposite the first drive magnet;
A first position detecting element that is located in a central portion of the first driving coil and detects a movement position of the lens or the photoelectric conversion element in the first direction;
A second drive coil positioned opposite the second drive magnet;
A second position detection element that is positioned at the center of the second drive coil and detects a movement position of the lens or the photoelectric conversion element in the second direction;
A first positioning part that holds the first position detection element from both sides in the first direction on the second correction moving frame, and the second position detection element is the second position detection element. And a second positioning portion that is held in a state of being sandwiched from both sides in the direction of. Disposing the first position detecting element on a line passing through the optical axis in the first direction;
The blur correction mechanism according to claim 1, wherein the second position detection element is arranged on a line extending in the second direction through the optical axis. The blur correction mechanism according to claim 1, wherein hall elements are used as the first position detection element and the second position detection element. As the first driving magnet, a magnet having N and S poles magnetized adjacent to each other in the first direction is used.
As the second driving magnet, a magnet having N and S poles magnetized adjacent to each other in the second direction is used.
In an initial state in which no current is supplied to any of the first drive coil and the second drive coil, the center of the first position detection element in the first direction is the first drive. The first position detection element is positioned so as to oppose the boundary line between the north pole and the south pole of the magnet for use, and the center of the second position detection element in the second direction is the second position. The blur correction mechanism according to claim 1, wherein the second position detection element is positioned so as to face a boundary line between the N pole and the S pole of the driving magnet. A lens barrel in which a blur correction mechanism that performs blur correction by moving a lens or a photoelectric conversion element that receives light from the lens in a direction orthogonal to the optical axis is disposed inside the lens holding cylinder,
The blur correction mechanism is
A base frame to which a first drive magnet and a second drive magnet are attached;
A first correction moving frame supported by the base frame so as to be movable in a first direction orthogonal to the optical axis;
A second correction that is supported by the first correction moving frame so as to be movable in a second direction orthogonal to both the optical axis and the first direction, and that holds the blur correction lens or the photoelectric conversion element. Moving frame for
A first drive coil positioned opposite the first drive magnet;
A first position detecting element that is located in a central portion of the first driving coil and detects a movement position of the lens or the photoelectric conversion element in the first direction;
A second drive coil positioned opposite the second drive magnet;
A second position detection element that is positioned at the center of the second driving coil and detects a movement position of the lens or the photoelectric conversion element in the second direction;
A first positioning portion that holds the first position detection element in a state of being sandwiched from both sides in the first direction on the second correction moving frame, and the second position detection element is the second position. And a second positioning portion that is held in a state of being sandwiched from both sides in the direction of the lens. Disposing the first position detecting element on a line passing through the optical axis in the first direction;
The lens barrel according to claim 5, wherein the second position detection element is disposed on a line passing through the optical axis and extending in the second direction. The lens barrel according to claim 5, wherein Hall elements are used as the first position detection element and the second position detection element. As the first driving magnet, a magnet having N and S poles magnetized adjacent to each other in the first direction is used.
As the second driving magnet, a magnet having N and S poles magnetized adjacent to each other in the second direction is used.
In an initial state where no current is supplied to any of the first driving coil and the second driving coil, the central portion of the first position detection element in the first direction is the first The first position detection element is positioned so as to oppose the boundary line between the N pole and the S pole of the drive magnet, and the central portion of the second position detection element in the second direction is the first. The lens barrel according to claim 5, wherein the second position detection element is positioned so as to face a boundary line between the N pole and the S pole of the second drive magnet. An image pickup apparatus including a lens barrel in which a blur correction mechanism that performs blur correction by moving a lens or a photoelectric conversion element that receives light from the lens in a direction orthogonal to the optical axis is disposed inside the lens holding cylinder There,
The blur correction mechanism is
A base frame to which a first drive magnet and a second drive magnet are attached;
A first correction moving frame supported by the base frame so as to be movable in a first direction orthogonal to the optical axis;
A second correction that is supported by the first correction moving frame so as to be movable in a second direction orthogonal to both the optical axis and the first direction, and that holds the blur correction lens or the photoelectric conversion element. Moving frame for
A first drive coil positioned opposite the first drive magnet;
A first position detecting element that is located in a central portion of the first driving coil and detects a movement position of the lens or the photoelectric conversion element in the first direction;
A second drive coil positioned opposite the second drive magnet;
A second position detection element that is positioned at the center of the second drive coil and detects a movement position of the lens or the photoelectric conversion element in the second direction;
A first positioning part that holds the first position detection element from both sides in the first direction on the second correction moving frame, and the second position detection element is the second position detection element. An image pickup apparatus comprising: a second positioning portion that is held in a state of being sandwiched from both sides in the direction. Disposing the first position detecting element on a line passing through the optical axis in the first direction;
The imaging apparatus according to claim 9, wherein the second position detection element is arranged on a line that passes through the optical axis and extends in the second direction. The imaging apparatus according to claim 9, wherein Hall elements are used as the first position detection element and the second position detection element. As the first driving magnet, a magnet having N and S poles magnetized adjacent to each other in the first direction is used.
As the second driving magnet, a magnet having N and S poles magnetized adjacent to each other in the second direction is used.
In an initial state where no current is supplied to any of the first driving coil and the second driving coil, the central portion of the first position detection element in the first direction is the first The first position detection element is positioned so as to oppose the boundary line between the N pole and the S pole of the drive magnet, and the central portion of the second position detection element in the second direction is the first. The imaging apparatus according to claim 9, wherein the second position detection element is positioned so as to face a boundary line between the N pole and the S pole of the second driving magnet.

Images