JP2010128389A - Image blur correction device, imaging lens unit, and camera unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically perform centering of a correction lens in a dormant state, while attaining simplification and miniaturization of structure, and prevention of disconnection, or the like, in an image blur correction device. <P>SOLUTION: The image blur correction device includes: a base 100; a movable holding member 110; a support mechanism for supporting the movable holding member, to be movable in a plane perpendicular to an optical axis of a lens; a driving means for driving the movable holding member in the plane; a position detection means; and a restoring means for restoring the movable holding member to a dormant position in the dormant state. The driving means includes coils 121 and 131 fixed on the base; and driving magnets 122 and 132, fixed on the movable holding member so as to be opposed to the coils. The restoring means includes restoring magnets 161 and 162 fixed on the base so as to be opposed to the driving magnets. Thus, the simplification and miniaturization of the structure are attained, and the centering of the correction lens is performed automatically, while disconnection, or the like, of a wiring connected to the coil is prevented. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an image blur correction device mounted on a lens barrel or a shutter unit of a digital camera, an imaging lens unit and a camera unit including the image blur correction device, and more particularly to a portable information terminal such as a mobile phone. The present invention relates to a small and thin image blur correction device, an imaging lens unit, and a camera unit that are applied to a camera unit to be mounted.

As a conventional image blur correction device, a substantially rectangular base having an opening in the center, a first guide shaft provided on the front surface of the base, and a first guide shaft supported reciprocally along the first guide shaft. A first movable member, a second guide shaft oriented in the direction of 90 degrees with respect to the first guide shaft and provided on the front surface of the first movable member; a lens which is supported so as to reciprocate along the second guide shaft; A second movable member that holds the first movable member, a first drive device that reciprocates the first movable member and the second movable member together in the direction of the first guide shaft, and a second movable member that reciprocates in the direction of the second guide shaft. 2. Description of the Related Art There is known a device that includes a second drive device to be moved, and employs a voice coil motor including a coil and a magnet as the first drive device and the second drive device (see, for example, Patent Document 1).
However, this apparatus has a two-stage configuration in which the first movable member and the second movable member are arranged in the optical axis direction, which leads to an increase in size of the apparatus in the optical axis direction.
Further, although the second driving device drives only the second movable member, the first driving device needs to drive not only the first movable member but also the second movable member and the second guide shaft together. Compared with the case where only the movable member is driven, a larger driving force must be generated, leading to an increase in the size of the first driving device. Furthermore, since the driving load of the first driving device is different from the driving load of the second driving device, driving control for positioning the lens in a plane perpendicular to the optical axis is not easy.

As another image blur correction apparatus, a substantially rectangular base having an opening, four elastic support members (wires) that are implanted in the four front corners of the base and extend in the optical axis direction, and four A movable member that holds the lens by connecting the tip of the elastic support member, a first magnet and a first yoke provided on the movable member, a second magnet and a second yoke provided on the movable member, and a base Includes a substantially rectangular fixed frame that is fixed to another different member and is disposed in front of the movable member and holds the first coil and the second coil. The first magnet, the first yoke, and the first coil are the first ones. The driving means is constituted, the second magnet, the second yoke, and the second coil constitute second driving means, the first driving means drives the movable member in the first direction perpendicular to the optical axis, and the second driving means To move the movable member perpendicular to the optical axis and the first direction. Those to be driven in the direction is known (e.g., see Patent Document 2).
However, in this apparatus, the movable member is supported by the base using four elastic support members (wires) extending in the optical axis direction, and further, a fixed frame that holds the coil by another member in front of the movable member. This increases the size of the device in the optical axis direction, and the connecting portions of the four elastic support members are not rigidly linked but are rigidly connected, so that the movable member (lens) is connected to the optical axis. In addition to being moved in a vertical plane direction, there is a risk of tilting with respect to the optical axis.
Even if the base and the movable member are connected, the fixed frame for holding the coil is not integrally connected. Therefore, it cannot be modularized as an image blur correction device, and is inconvenient to handle. The first and second magnets of the movable member and the first and second coils of the fixed frame cannot be aligned with respect to one member (for example, the base), and the assembly work of the apparatus is troublesome. . Further, since the first driving means (the first magnet and the first yoke) and the second driving means (the second magnet and the second yoke) are disposed only on one side of the movable member with respect to the lens, The first driving means and the second driving means exert driving force only on one side of the movable member, not symmetrically with respect to the lens, and tend to promote inclination of the movable member, that is, inclination of the lens.

As another image blur correction apparatus, a base, a movable member holding a lens, three balls and a coil spring as a support mechanism for supporting the movable member with respect to the base, and an optical axis There are known driving means (driving magnet, coil, yoke) for driving in a direction perpendicular to the head and position detecting means (magnet, Hall element) for detecting the position of the movable member (for example, (See Patent Document 3).
In this apparatus, since three rolling balls are interposed between the movable member and the base, the apparatus can be thinned in the optical axis direction, but the movable member is always in contact with the three balls. The urging force is exerted by the coil spring so as to be supported, and the urging force of the coil spring acts as a resistance force, that is, a driving load when driving the movable member, so that the driving means counters the urging force of the coil spring. It is necessary to generate as much driving force as possible.

Further, as another image blur correction device, a base, a movable member that holds a lens, a first drive unit (magnet, coil, yoke) and a second drive for driving the movable member in two directions perpendicular to the optical axis. There are known means (magnet, coil, yoke) and two assist springs for returning the movable member to the center position (centering) in the non-energized state (resting state) in which the coil is not energized. (For example, see Patent Document 4).
In this apparatus, since an assist spring is employed as a return means for returning the movable member to the center position, a space for arranging the assist spring is required, which leads to an increase in diameter and size of the apparatus.

JP 2007-286318 A JP 2008-64846 A Japanese Patent No. 3969927 Japanese Patent No. 3869926

  The present invention has been made in view of the above circumstances, and its object is to simplify the structure and reduce the size and thickness of the device in the optical axis direction of the lens and in the direction perpendicular to the optical axis direction. It can be mounted on a camera unit such as a mobile phone, and image blur due to camera shake can be corrected with high accuracy, disconnection of electrical connection wiring, etc. can be prevented, and correction can be performed in a resting state. Another object of the present invention is to provide an image blur correction device capable of automatically returning (centering) a lens for use to a predetermined rest position, and an imaging lens unit and a camera unit including the image blur correction device.

An image shake correction apparatus according to the present invention includes a base having an opening, a movable holding member that holds a lens, a support mechanism that supports the movable holding member in a plane perpendicular to the optical axis of the lens, and a movable holding An image shake correction apparatus comprising: a drive unit that drives a member in the plane; a position detection unit that detects a position of the movable holding member; and a return unit that returns the movable holding member to a predetermined pause position in a pause state. The drive means includes a coil fixed to the base and a drive magnet fixed to the movable holding member at a position facing the coil, and the return means returns to the rest position facing the drive magnet. And a return magnet fixed to the base to generate the magnetic force to be generated.
According to this configuration, the movable holding member is a plane perpendicular to the optical axis with respect to the base by the driving force generated in cooperation with the driving magnet by energizing the coil while being supported movably by the support mechanism. The image blur caused by hand shake or the like can be corrected with high accuracy. Here, since the coil that requires electrical wiring is fixed to the base (which does not move in the plane direction perpendicular to the optical axis), disconnection of the connection wiring can be prevented, and the return magnet and the drive are driven. A magnetic attraction action is obtained with the magnet, and the movable holding member (lens) automatically returns to a predetermined rest position (for example, a position where the optical axis of the lens coincides with the center of the opening of the base) ( For example, it is centered and held stably. Therefore, drive control such as initialization is not required during driving, and rattling of the movable holding member can be prevented in the resting state. Thus, since the drive magnet of the drive means is also used as a magnet that magnetically interacts with the return magnet, the structure can be simplified, the apparatus can be downsized, and the like.

The said structure WHEREIN: The structure which is arrange | positioned so that a return magnet may oppose a drive magnet on both sides of a coil can be employ | adopted.
According to this configuration, the apparatus can be reduced in size in a plane direction perpendicular to the optical axis.

In the above configuration, the position detection unit may employ a configuration including a magnetic sensor fixed to the base so as to face the drive magnet.
According to this configuration, since the magnetic sensor is fixed to the base, wiring is easier than in the case where the magnetic sensor is provided on the movable holding member, and disconnection or the like accompanying movement can be prevented. Since it is also used for position detection, the structure can be simplified, the number of parts can be reduced, the size of the apparatus can be reduced, and the like, compared with the case where a dedicated magnet is provided.

In the above configuration, including a flexible wiring board electrically connected to the coil and the magnetic sensor, the flexible wiring board is disposed adjacent to the base on the side opposite to the side where the movable holding member faces. A configuration can be employed.
According to this configuration, by fixing the flexible wiring board to the base, there is no need to move in the plane direction perpendicular to the optical axis, that is, the flexible wiring board is bent and arranged in the plane direction in which the movable holding member moves. Therefore, the arrangement space can be reduced, the apparatus can be miniaturized, and the durability can be improved.

In the above-described configuration, the driving unit may employ a configuration including a plate-like yoke disposed adjacent to bend and fix the flexible wiring board.
According to this configuration, the magnetic efficiency can be increased in the magnetic circuit, and the flexible wiring board can be bent and attached using the yoke, so that a member dedicated for attachment becomes unnecessary, and the number of parts is reduced. The flexible wiring board can be securely fixed.

In the above configuration, the driving means includes a first driving mechanism that drives in a first direction in a plane perpendicular to the optical axis, and a second driving mechanism that drives in a second direction in a plane perpendicular to the optical axis, and the coil Includes a first coil included in the first drive mechanism and a second coil included in the second drive mechanism, and the drive magnet is included in the first drive mechanism and is opposed to the first coil; The second drive mechanism includes a second drive magnet that faces the second coil, and the return magnet includes a first return magnet that faces the first drive magnet, and a second return magnet that faces the second drive magnet. The magnetic sensor can employ a configuration including a first magnetic sensor facing the first driving magnet and a second magnetic sensor facing the second driving magnet.
According to this configuration, the movable holding member is moved in a plane perpendicular to the optical axis by the first drive mechanism (first drive magnet, first coil) and the second drive mechanism (second drive magnet, second coil). The movable holding member is returned to a predetermined rest position by the magnetic attraction action of the first return magnet and the first drive magnet and the magnetic attraction action of the second return magnet and the second drive magnet. Can be positioned and held.

An imaging lens unit according to the present invention is characterized in that, in an imaging lens unit including a plurality of imaging lenses, any one of the image blur correction apparatuses having the above-described configuration is included.
According to this configuration, in the configuration in which the plurality of imaging lenses are arranged in the optical axis direction, the correction lens held by the movable holding member is appropriately driven by including the image blur correction device. Thus, image blur due to camera shake or the like can be corrected smoothly and with high accuracy.
That is, it is possible to provide an imaging lens unit to which the image blur correction function is added in addition to a plurality of imaging lenses.

Furthermore, the camera unit of the present invention is characterized in that, in a camera unit including an image sensor, any one of the image blur correction apparatuses having the above-described configuration is included.
According to this configuration, in the camera unit including the image sensor, the correction lens held by the movable holding member is appropriately driven by including the above-described image blur correction device, so that the image blur due to camera shake or the like is smoothly performed. And it can correct | amend with high precision and can obtain a favorable picked-up image with an image pick-up element.

  According to the image shake correcting apparatus having the above-described configuration, the camera unit such as a mobile phone is achieved while achieving simplification of the structure, downsizing and thinning of the apparatus in the optical axis direction of the lens and the direction perpendicular to the optical axis direction. It can be mounted on the camera, and image blur due to camera shake can be corrected with high accuracy, disconnection of the electrical connection wiring can be prevented, and the correction lens is automatically set to a predetermined rest position in the rest state. An image blur correction device capable of returning to (centering) can be obtained, and an imaging lens unit and a camera unit including the image blur correction device can be obtained.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the accompanying drawings.
1 to 17 show an embodiment of an image shake correction apparatus according to the present invention, and FIG. 1 is a perspective view showing a portable information terminal equipped with a camera unit incorporating the image shake correction apparatus. 2 is a perspective view showing the camera unit, FIG. 3 is a plan view showing the inside of the camera unit, FIG. 4 is a block diagram showing the control system, FIG. 5 is a sectional view of the camera unit, and FIG. 6 is a perspective view of the image blur correction device. 7 is an exploded perspective view of the image shake correcting device, FIG. 8 is a cross-sectional view of the image shake correcting device, and FIGS. 9 and 10 are perspective views showing a part of the image shake correcting device (such as a movable holding member). 11 and 12 are a front view and a rear view showing a part (base, etc.) of the image shake correction apparatus, FIG. 13 is a front view showing a part (movable holding member, base, etc.) of the image shake correction apparatus, and FIG. A part of the image blur correction device (base, movable holding member, etc.) is shown. FIG. 15 is a perspective view showing the assembly of the flexible wiring board and the yoke in the image blur correction device, and FIGS. 16 (a), (b), (c) and FIGS. 17 (a), (b), (c). ) Is a plan view for explaining the operation of the image blur correction apparatus.

  As shown in FIG. 1, the camera unit U incorporating the image blur correction device is mounted on a flat and small portable information terminal PH. The portable information terminal PH includes a housing PH1 having a substantially rectangular shape and a flat outline, a display portion PH2 such as a liquid crystal panel arranged on the surface of the housing PH1, a control button PH3, and a display portion PH2. A photographing window PH4 and the like formed on the opposite surface are provided. As shown in FIG. 1, the camera unit U is accommodated in the housing PH1 so as to extend in a direction perpendicular to the optical axis L1 of the subject light entering from the photographing window PH4.

  2 and 3, the camera unit U includes a unit case 10, a prism 20, a lens G1, a first movable lens group 30 that holds the lens G2, and a second movable lens that holds the lenses G3, G4, and G5. An image blur correction device M as a group, a lens G6, a filter 40, a CCD 50 as an image sensor, a first drive unit 60 for driving the first movable lens group 30 in the direction of the optical axis L2, and a second movable lens group (image blur correction). The apparatus includes a second drive unit 70 that drives the device M) in the direction of the optical axis L2, an angular velocity sensor 80, a control unit 90, and the like.

As shown in FIGS. 2 and 3, the unit case 10 is flat and has a substantially rectangular shape so that the thickness dimension in the optical axis L1 direction is thin and the length dimension in the optical axis L2 direction is short. The formed protrusion 11 that fixes the prism 20, the holding part 12 that holds the lens G1, the holding part 13 that holds the lens G6, the holding part 14 that holds the filter 40, the holding part 15 that holds the CCD 50, and the like. I have.
As shown in FIGS. 2 and 3, the prism 20 is accommodated in the protruding portion 11 of the unit case 10, and guides the optical axis L1 of the subject light entering from the photographing window PH4 in the direction of the optical axis L2 by bending it at a right angle. It is like that.
As shown in FIGS. 2 and 3, the lens G <b> 1 is disposed behind the prism 20 in the directions of the optical axes L <b> 1 and L <b> 2 and is fixed to the holding portion 12 of the unit case 10.

As shown in FIGS. 2 and 3, the first movable lens group 30 is disposed behind the lens G1 in the direction of the optical axis L2 and is movably supported in the direction of the optical axis L2, and is supported by the first drive unit 60. It is driven to reciprocate in the direction of the optical axis L2.
That is, the first movable lens group 30 is slidably engaged with the lens holding member 31, the guided portion 32 guided by the guide shaft 61, and the rotation preventing shaft 62, and the rotation about the optical axis L2 is restricted. A regulated portion 33, a U-shaped engagement portion 34 with which a nut 65 screwed to the lead screw 63 abuts, and the like are provided.

As shown in FIG. 3, the lens G6 is disposed behind the second movable lens group (image blur correction device M) in the optical axis L2 direction, and is fixed to the holding portion 13 of the unit case 10.
The filter 40 is an infrared cut filter, a low-pass filter, or the like, and is disposed behind the lens G6 in the optical axis L2 direction and fixed to the holding portion 14 of the unit case 10, as shown in FIG.
As shown in FIG. 3, the CCD 50 is disposed behind the filter 40 in the direction of the optical axis L <b> 2 and is fixed to the holding portion 15 of the unit case 10.

  As shown in FIGS. 2 and 3, the first drive unit 60 includes a guide shaft 61 and a detent shaft 62 fixed to the unit case 10 by extending in the direction of the optical axis L2, and a lead screw extending in the direction of the optical axis L2. 63, a motor 64 that rotationally drives the lead screw 63, a nut 65 that engages with the U-shaped engagement portion 34 of the first movable lens group 30 while being screwed to the lead screw 63, and a nut 64 that has the U-shaped engagement portion 34 A tension-type coil spring 66 or the like that is hooked between the lens holding member 31 and a base 100 to be described later is provided so as to exert a biasing force that always biases toward the bottom.

  As shown in FIG. 2, the second drive unit 70 includes a guide shaft 71 and a detent shaft (here also used as the detent shaft 62) that extend in the direction of the optical axis L <b> 2 and are fixed to the unit case 10. A lead screw 73 extending in the L2 direction, a motor 74 that rotationally drives the lead screw 73, and a nut 75 that is screwed into the lead screw 73 and abuts against the U-shaped engaging portion 103 of the base 100 included in the second movable lens group. And a coil spring (here, also used as the coil spring 66) that exerts an urging force that constantly urges the U-shaped engaging portion 103 toward the nut 75.

As shown in FIG. 3, the angular velocity sensor 80 is fixed to the unit case 10 via a substrate, and detects vibrations and shakes received by the camera unit U.
As shown in FIG. 3, the control unit 90 is a microcomputer fixed to the outer wall of the unit case 10. As shown in FIG. 4, the control unit 90 performs control processing and processes various signals to generate command signals. Part 91, a motor drive circuit 92 for driving the motor 64 of the first drive unit 60, a motor drive circuit 93 for driving the motor 74 of the second drive unit 70, a CCD drive circuit 94 for driving the CCD 50, and the image blur correction device M. The drive circuit 95 that drives the first coil 121 and the second coil 131 included, and the first magnetic sensor 171 and the second magnetic sensor 172 that detect the position of the movable holding member 110 included in the image shake correction apparatus M are connected. A position detection circuit 96, an angular velocity detection circuit 97 connected to the angular velocity sensor 80, and the like are provided.

As shown in FIGS. 2, 3, and 5, the image blur correction device M as the second movable lens group is disposed between the first movable lens group 30 and the lens G6 in the direction of the optical axis L2, and the optical axis L2. It is supported movably in the direction.
As shown in FIGS. 2 and 6 to 8, the image blur correction device M includes a base 100, a movable holding member 110, and a first (including a first coil 121 and a first drive magnet 122) as drive means. The driving mechanism 120, the second driving mechanism 130 (including the second coil 131 and the second driving magnet 132) as driving means, the yokes 141 and 142 included in the driving means, and the movable holding member 110 in a plane perpendicular to the optical axis L2. Three spheres 150 as support mechanisms that are movably supported in the interior, first return magnet 161 and second return magnet 162 as return means, first magnetic sensor 171 and second magnetic sensor 172 as position detection means, electric A flexible wiring board 180 or the like for performing a general connection is provided.

  As shown in FIGS. 6 to 8, FIG. 11, and FIG. 12, the base 100 is substantially flat in the direction of the optical axis L2, narrow in the direction of the straight line S1 perpendicular to the optical axis L2 and parallel to the optical axis L1, It is formed in a substantially rectangular flat plate shape elongated in the direction of the optical axis L2 and the straight line S2 orthogonal to the straight line S1, and the opening 100a centering on the optical axis L2 and the first coil 121 are fitted and fixed. The fitting recess 100b, the fitting recess 100c for fitting and fixing the first magnetic sensor 171, the fitting recess 100d for fitting and fixing the first return magnet 161, and the second coil 131 are fixed by fitting. The fitting recess 100e, the fitting recess 100f for fitting and fixing the second magnetic sensor 172, the fitting recess 100g for fitting and fixing the second return magnet 162, and the guide shaft 71 are slidably engaged. Guided part 101 guided by A regulated portion 102 that is slidably engaged with the flange 62 and is restricted from rotating about the optical axis L2, a U-shaped engaging portion 103 with which a nut 75 screwed to the lead screw 73 abuts, and a support mechanism Are provided with three recesses 104 for receiving the spherical body 150, four connection pins 105 for movably connecting the movable holding member 110, two screw holes 106 for fixing the yoke 141 with screws B, and the like.

As shown in FIGS. 11 and 12, the opening 100a defines a center C1 at the intersection of the straight line S1 and the straight line S2 and a parallel inner wall surface in the direction of the straight line S1, and the movable holding member 110 is driven. In this range, the holding portion 110a of the movable holding member 110 is formed to have an inner diameter dimension that can pass through in a non-contact manner.
The fitting recesses 100b, 100c, 100d and the fitting recesses 100e, 100f, 100g are formed so as to be symmetrical with respect to the straight line S1, as shown in FIGS. That is, the first coil 121, the first return magnet 161, the first magnetic sensor 171 and the second coil 131, the second return magnet 162, and the second magnetic sensor 172 are lined with respect to the straight line S 1 on the base 100. Arranged symmetrically.
The three recesses 104 are formed so as to be able to roll freely in a state in which the sphere 150 is partially protruded in the direction of the optical axis L2. As shown in FIG. 11, the three concave portions 104 are arranged such that one concave portion 104 is arranged on the straight line S1 and in the vicinity of the opening 100a, and the other two concave portions 104 are arranged with respect to the straight line S1. It is arranged in a symmetrical position. That is, the three recesses 104 are arranged so as to be positioned at the three vertices of the isosceles triangle.
The connection pin 105 is formed in a cylindrical shape so as to be inserted into the connection notch 115 and the connection long hole 116 of the movable holding member 110. The connecting pin 105 is fitted and fixed at the time of assembly.

  As shown in FIGS. 6 to 10, 13 and 14, the movable holding member 110 is substantially flat except for a part in the direction of the optical axis L2, narrow in the direction of the straight line S1, and in the direction of the straight line S2. It is formed in a long and substantially rectangular flat plate shape, and has a cylindrical holding portion 110a that holds the lenses G3, G4, and G5 around the optical axis L2, and extends to both sides in the direction of the straight line S2 across the holding portion 110a. Two extending portions 111, a fitting hole 112 for fitting and fixing the first driving magnet 122, a fitting hole 113 for fitting and fixing the second driving magnet 132, and three spheres 150 as a support mechanism Three contact surfaces 114 that contact each other, two connection cutout portions 115 into which the four connection pins 105 are inserted, two connection long hole portions 116, two positioning projections 117 for positioning the yoke 142, and the like. Yes.

The holding part 110a is formed in a flat cylindrical shape in the direction of the straight line S1 so as to hold the lenses G3, G4, G5 having cut surfaces parallel in the direction of the straight line S1.
As shown in FIG. 10, the three contact surfaces 114 have three concave portions 104 in the optical axis L2 direction in a state where the optical axis L2 of the lenses G3, G4, and G5 coincides with the center C1 of the opening 100a of the base 100. In the range where the movable holding member 110 is arranged to face the (sphere 150) and moves two-dimensionally in a plane perpendicular to the optical axis L2 (a plane including the straight lines S1 and S2), the corresponding concave portion of the base 100 is provided. It is formed in a planar shape having a predetermined area so as not to deviate from the state in contact with the sphere 150 inserted into 104.
As shown in FIGS. 9, 10, and 14, the connection notch 115 is formed to extend in a direction parallel to the straight line S <b> 2 perpendicular to the optical axis L <b> 2 and to open outward in the direction of the straight line S <b> 2. The connection pin 105 is slidably received.
As shown in FIGS. 10 and 14, the connection long hole portion 116 is formed to extend in a direction parallel to the straight line S1 perpendicular to the optical axis L2, and is configured to slidably receive the connection pin 105. .

That is, when the movable holding member 110 is disposed to face the base 100 so that the three contact surfaces 114 are in contact with the three spheres 150 inserted into the three recesses 104, the first fixed to the base 100 is provided. The first return magnet 161 and the first drive magnet 122 fixed to the movable holding member 110 magnetically attract, and the second return magnet 162 fixed to the base 100 and the second drive fixed to the movable holding member 110. Since the magnet 132 is magnetically attracted, the movable holding member 110 is movably supported in a plane perpendicular to the optical axis L2 without being separated from the base 100, and the connecting pin 105 is connected to the connecting notch. 115 and the connecting elongated hole portion 116, the movable holding member 110 is restricted from moving away from the base 100 in the optical axis L2 direction. It will be movably supported within the (plane including the straight line S1, S2) to a plane perpendicular to the optical axis L2 with respect to scan 100.
Then, the driving force of the first driving mechanism 120 and the second driving mechanism 130 is two-dimensionally moved in the plane with respect to the base 100, and image blur due to camera shake or the like is corrected with high accuracy. ing.

  Here, the support mechanism includes three spheres 150 inserted into three recesses 104 provided in the base 100 and three contact surfaces 114 provided in the movable holding member 110 and in contact with the three spheres 150. Therefore, simplification of the structure and size reduction of the apparatus can be achieved. Further, the movable holding member 110 is disengaged due to the mutual magnetic attraction force between the return magnets 161 and 162 and the drive magnets 122 and 132 and the engagement relationship between the connection pin 105, the connection notch 115 and the connection long hole 116. Therefore, as compared with the conventional case where the urging force of the spring is used to prevent detachment, an extra driving force is not required, and the movable holding member 110 can be driven in a balanced manner.

As shown in FIGS. 7, 8, 13 and 14, the first drive mechanism 120 is formed as a voice coil motor including a first coil 121 and a first drive magnet 122.
As shown in FIGS. 11 to 14, the first coil 121 is formed so as to form a substantially elliptical ring having a major axis in the direction of the straight line S3 and a minor axis in the direction of the straight line S4 ′ when viewed from the optical axis L2. Then, it is fitted and fixed in the fitting recess 100b of the base 100.
The first coil 121 is arranged such that its long axis forms an inclination angle of 45 degrees with respect to the straight line S2 (the long axis is parallel to the straight line S3).
As shown in FIGS. 13 and 14, the first drive magnet 122 is formed in a rectangular shape magnetized with N and S poles with a plane passing through the straight line S <b> 3, and the movable holding member 110 is fitted to the first drive magnet 122. The hole 112 is fitted and fixed.
The first drive mechanism 120 generates electromagnetic driving force in the first direction perpendicular to the optical axis L2, that is, the direction of the straight line S4 ′ by turning on / off the energization of the first coil 121. .

As shown in FIGS. 7, 8, 13 and 14, the second drive mechanism 130 is formed as a voice coil motor including a second coil 131 and a second drive magnet 132.
As shown in FIGS. 11 to 14, the second coil 131 is formed so as to form a substantially elliptical ring having a major axis in the direction of the straight line S4 and a minor axis in the direction of the straight line S3 ′ as viewed from the direction of the optical axis L2. Then, it is fitted and fixed in the fitting recess 100e of the base 100.
The second coil 131 is arranged such that its long axis forms an inclination angle of 45 degrees with respect to the straight line S2 (the long axis is parallel to the straight line S4).
As shown in FIGS. 13 and 14, the second drive magnet 132 is formed in a rectangular shape that is magnetized into an N pole and an S pole with a plane passing through the straight line S <b> 4, and the movable holding member 110 is fitted to the second drive magnet 132. The hole 113 is fitted and fixed.
The second drive mechanism 130 generates electromagnetic drive force in the second direction perpendicular to the optical axis L2, that is, the direction of the straight line S3 ′ by turning on / off the energization of the second coil 131. .

As shown in FIGS. 7 and 8, the yoke 141 is formed in a substantially rectangular plate shape, and includes a notch portion 141a, a bent portion 141b, and two screw holes 141c having substantially the same shape as the opening portion 100a. It is formed as follows.
As shown in FIG. 15, the yoke 141 is disposed adjacent to the back surface of the flexible wiring board 180 so as to sandwich and bend and fix the flexible wiring board 180, and is detachable from the base 100 using screws B. It is supposed to be fixed to.
As shown in FIGS. 6 to 8, the yoke 142 is formed in a substantially rectangular plate shape, and has a circular opening 142a for receiving the holding portion 110a and two fitting holes 142b for fitting the positioning projections 117. It is formed to provide.
The yoke 142 is fixed to the front surface of the movable holding member 110 (and the first drive magnet 122 and the second drive magnet 132) while fitting the positioning protrusion 117 into the fitting hole 142b using an adhesive or the like. Yes.
As described above, by providing the yokes 141 and 142 included in a part of the driving means, it is possible to suppress the magnetic lines of force generated by the first driving mechanism 120 and the second driving mechanism 130 from leaking to the outside, and the magnetic efficiency. Can be increased.

As shown in FIG. 13, the first drive mechanism 120 and the second drive mechanism 130 are symmetrical with respect to a straight line S1 orthogonal to the optical axis L2 of the lenses G3, G4, and G5 held by the movable holding member 110. Since the driving loads received by each are the same, and the driving force is exerted on both sides of the lenses G3, G4, G5, the movable holding member 110 is stabilized in a plane perpendicular to the optical axis L2. And can be driven smoothly.
In addition, since the first coil 121 and the second coil 131 are arranged so that the major axes thereof form a predetermined inclination angle (approximately 45 degrees) with respect to the straight line S2, the movable holding member 110 is moved along the straight line S2. When the shape is long in the direction, the first coil 121 and the second coil 131 can be inclined to reduce the size of the movable holding member 110 in the direction of the straight line S1 and is perpendicular to the optical axis L2. The apparatus can be reduced in size and thickness in the direction (the direction of the straight line S1).

As shown in FIGS. 8 and 12, the first return magnet 161 is formed in a substantially rectangular shape when viewed from the direction of the optical axis L2, and is magnetized into S and N poles with a plane passing through the straight line S3 as a boundary. The first magnetic sensor 171 is sandwiched between the two fitting recesses 100d of the base 100 and fixed in the direction of the straight line S3.
That is, the two first return magnets 161 have an inclination angle of 45 degrees with respect to the straight line S2 and are arranged on the straight line S3 so as to be substantially parallel to the long axis of the first coil 121.
The first return magnet 161 forms a magnetic path facing the first drive magnet 122 and exerts a magnetic action, and the movable holding member 110 is suspended for a predetermined time in a non-energized state where the first coil 121 is not energized. In this case, the lens G3, G4, G5 is returned to its position (a position where the optical axis L2 of the lens G3 coincides with the center C1 of the opening 100a of the base 100) and a stable holding force is generated.

As shown in FIGS. 8 and 12, the second return magnet 162 is formed in a substantially rectangular shape when viewed from the direction of the optical axis L2, and is magnetized into S and N poles with a plane passing through the straight line S4 as a boundary. The second magnetic sensor 172 is sandwiched in the direction of the straight line S4 and is fitted and fixed to the two fitting recesses 100g of the base 100.
That is, the two second return magnets 162 are arranged on the straight line S4 at an inclination angle of 45 degrees with respect to the straight line S2 so as to be substantially parallel to the long axis of the second coil 131.
Then, the second return magnet 162 forms a magnetic path facing the second drive magnet 132 and exerts a magnetic action, and the movable holding member 110 is suspended for a predetermined period in a non-energized state where the second coil 131 is not energized. In this case, the lens G3, G4, G5 is returned to its position (a position where the optical axis L2 of the lens G3 coincides with the center C1 of the opening 100a of the base 100) and a stable holding force is generated.

As described above, in the resting state, the movable holding is performed by the magnetic attraction between the first return magnet 161 and the second return magnet 162 of the return means and the first drive magnet 122 and the second drive magnet 132 of the drive means. The member 110 (lenses G3, G4, G5) automatically returns (centering) to a predetermined rest position (a position where the optical axis L2 of the lenses G3, G4, G5 coincides with the center C1 of the opening 100a of the base 100). To be held stably. Therefore, drive control such as initialization is not required during driving, and rattling of the movable holding member 110 can be prevented in a resting state. In addition, since the first drive magnet 122 and the second drive magnet 132 of the drive means are combined with the first return magnet 161 and the second return magnet 162 of the return means, the structure is simplified and the apparatus is downsized. Etc. can be achieved.
Further, the arrangement direction of the two first return magnets 161 and the major axis of the first coil 121 are arranged substantially parallel to each other, and the arrangement direction of the two second return magnets 162 and the length of the second coil 131 are arranged. Since the shafts are arranged so as to be substantially parallel to each other, the magnetic force of the return magnets 161 and 162 and the magnetic force of the drive magnets 122 and 132 during driving (when the first coil 121 and the second coil 131 are energized) A force that prevents the movable holding member 110 from rotating around the optical axis L2 due to the interaction acts, and the return magnets 161 and 162 are arranged in the direction of the magnetization boundary line, so that a large moment that suppresses the rotation. Thus, the movable holding member 110 can be quickly moved in a plane perpendicular to the optical axis L2 to be positioned at a desired position with high accuracy.

  The first magnetic sensor 171 and the second magnetic sensor 172 are, for example, Hall elements that detect a change in magnetic flux density and output it as an electrical signal. As shown in FIGS. The fitting recesses 100c and 100f (see FIG. 12) are respectively fitted and fixed. Here, in the moving range of the movable holding member 110, the first magnetic sensor 171 is disposed at a position facing the first drive magnet 122, and the second magnetic sensor 172 is disposed at a position facing the second drive magnet 132. Has been.

The first magnetic sensor 171 forms a magnetic circuit with the first drive magnet 122 fixed to the movable holding member 110, and is generated when the movable holding member 110 moves relative to the base 100. The position of the movable holding member 110 is detected by detecting a change in magnetic flux density.
Further, the second magnetic sensor 172 forms a magnetic circuit with the second drive magnet 132 fixed to the movable holding member 110, and is generated when the movable holding member 110 moves relative to the base 100. The position of the movable holding member 110 is detected by detecting a change in magnetic flux density.

  Thus, since the first magnetic sensor 171 and the second magnetic sensor 172 are fixed to the base 100, wiring is easier than when the first magnetic sensor 171 and the second magnetic sensor 172 are provided on the movable holding member 110, and disconnection or the like accompanying movement is prevented. In addition, since the first drive magnet 122 and the second drive magnet 132 are also used for position detection, the structure is simplified and the number of parts is reduced, compared with the case where a dedicated magnet is provided. Downsizing and the like can be achieved.

As shown in FIG. 7, the flexible wiring board 180 includes a connection part 181 connected to the first coil 121 of the first drive mechanism 120, a connection part 182 connected to the second coil 131 of the second drive mechanism 130, A connection portion 183 connected to the first magnetic sensor 171 and a connection portion 184 connected to the second magnetic sensor 172 are formed.
As shown in FIG. 15, the flexible wiring board 180 is disposed so as to contact the back surface of the base 100, the lead wire of the first coil 121 is connected to the connection portion 181, and the lead wire of the second coil 131 is Connected to the connecting portion 182, the terminal of the first magnetic sensor 171 is connected to the connecting portion 183, the terminal of the second magnetic sensor 172 is connected to the connecting portion 184, and the yoke 141 causes the regions of the connecting portions 181 and 182 to be It is inserted and fixed while being bent.

As described above, the flexible wiring board 180 is disposed and fixed adjacent to the side opposite to the side where the movable holding member 110 is opposed to the base 100 that does not move in the plane direction perpendicular to the optical axis L2. There is no need to move in the plane direction perpendicular to the optical axis L2, and there is no need to bend the flexible wiring board 180 in the plane direction in which the movable holding member 110 moves.
Therefore, the arrangement space of the flexible wiring board 180 can be narrowed, and therefore the apparatus can be miniaturized and the durability can be improved.

Next, the correction operation of the image blur correction apparatus M will be briefly described with reference to FIGS.
First, in a resting state in which the first coil 121 and the second coil 131 are not energized, the movable holding member 110 has a return means (first return magnet 161 and second return magnet 162) as shown in FIG. Due to the returning action, the optical axes L2 of the lenses G3, G4, G5 are returned (centered) to the rest position where they coincide with the center C1 of the opening 100a of the base 100 and held.
When the movable holding member 110 (lenses G3, G4, G5) is shifted upward as an example from the rest state shown in FIG. 16A, the first drive mechanism 120 is moved in the first direction (the direction of the straight line S4 ′). ) And a driving force is generated in the second driving mechanism 130 in an obliquely upward direction in the second direction (the direction of the straight line S3 ′). As a result, the movable holding member 110 is moved upward in the direction of the straight line S1, as shown in FIG.
When the movable holding member 110 (lenses G3, G4, G5) is shifted downward as an example from the rest state shown in FIG. 16A, the first drive mechanism 120 is moved in the first direction (the direction of the straight line S4 ′). ) And a driving force is generated in the second driving mechanism 130 in an obliquely downward direction in the second direction (the direction of the straight line S3 ′). As a result, the movable holding member 110 is moved downward in the direction of the straight line S1, as shown in FIG.

Subsequently, as shown in FIG. 17A, the movable holding member 110 is moved by the return action of the return means (the first return magnet 161 and the second return magnet 162), and the optical axis L2 of the lens G3, G4, G5. When the movable holding member 110 (lenses G3, G4, G5) is shifted to the left side as an example from the resting state in which the lens 100 returns to the resting position that coincides with the center C1 of the opening 100a of the base 100, the first drive mechanism 120 The driving force is generated obliquely upward in the first direction (the direction of the straight line S4 ′), and the driving force is generated diagonally downward in the second direction (the direction of the straight line S3 ′). Thereby, the movable holding member 110 is moved leftward in the direction of the straight line S2, as shown in FIG.
In addition, when the movable holding member 110 (lenses G3, G4, G5) is shifted to the right as an example from the rest state shown in FIG. 17A, the first drive mechanism 120 is moved in the first direction (the direction of the straight line S4 ′). ) And a driving force is generated in the second driving mechanism 130 diagonally upward in the second direction (the direction of the straight line S3 ′). Thereby, the movable holding member 110 is moved rightward in the direction of the straight line S2, as shown in FIG.

As described above, the movable holding member 110 is movably supported by the support mechanism (three spheres 150), and the first drive magnet 122 and the second drive are energized by energizing the first coil 121 and the second coil 131. The electromagnetic driving force generated in cooperation with the magnet 132 allows the base 100 to be moved two-dimensionally in a plane perpendicular to the optical axis L2, and image blur due to camera shake or the like can be corrected with high accuracy.
Here, the long axis of the first coil 121 and the arrangement direction of the two first return magnets 161 are arranged to extend in the same direction, and the long axis of the second coil 131 and the two second return magnets 162 are arranged. Are arranged so as to extend in the same direction as the arrangement direction of the magnets, and therefore the interaction between the magnetic force of the return magnets 161 and 162 and the magnetic force of the drive magnets 122 and 132 during driving (when the coils 121 and 131 are energized). This acts to suppress the rotation of the movable holding member 110 around the optical axis L2, and since the return magnets 161 and 162 are arranged in the direction of the magnetization boundary line, a large moment for suppressing the rotation is obtained. Thus, the movable holding member 110 can be quickly moved in a plane perpendicular to the optical axis L2 and positioned at a desired position with high accuracy.

In the above-described embodiment, the first coil 121 and the second coil 131 are substantially elliptical, but the present invention is not limited to this. The first coil 121 and the second coil 131 are not limited to this. A coil may be used.
In the above-described embodiment, the first magnetic sensor 171 and the second magnetic sensor 172 made of Hall elements are shown as the position detection means. However, the present invention is not limited to this, and other magnetic sensors may be adopted. .
In the above embodiment, a case where three spheres 150 inserted into the recesses 104 of the base 100 are employed as the support mechanism for supporting the movable holding member so as to come into contact with the three contact surfaces 114 of the movable holding member 110. Although shown, it is not limited to this, conversely, the base 100 may be provided with a plurality of contact surfaces, and the movable holding member may be provided with a plurality of recesses for receiving the sphere 150. The present invention may be adopted in a configuration including the support mechanism.

In the above-described embodiment, the image blur correction device applied to the camera unit U mounted on the portable information terminal has been described. However, in the imaging lens unit including a plurality of imaging lenses, the image blur correction having the above configuration is performed. You may employ | adopt the structure containing an apparatus.
According to this, in a configuration in which a plurality of imaging lenses are arranged in the optical axis direction, the correction lenses G3, G4, and G5 that are held by the movable holding member 110 by including the image blur correction device described above. Is appropriately driven, and image blur due to camera shake or the like can be corrected smoothly and with high accuracy. That is, it is possible to provide an imaging lens unit to which the image blur correction function is added in addition to a plurality of imaging lenses.

  As described above, the image shake correction apparatus of the present invention achieves simplification of the structure, downsizing and thinning of the apparatus in the optical axis direction of the lens and a direction perpendicular to the optical axis direction, prevention of disconnection, and the like. Since image blur can be corrected with high accuracy by camera shake and the return operation can be automatically performed in a resting state, such as mobile phones and portable music players that are required to be downsized and thin. Of course, the present invention can be applied to a camera unit mounted on a portable information terminal, and is also useful in a normal digital camera or other portable optical devices.

It is a perspective view which shows the portable information terminal which mounts the camera unit in which the image blur correction apparatus of this invention was integrated. It is a perspective view which shows a camera unit. It is a top view which shows the inside of a camera unit. It is a block diagram which shows the control system of an image blurring correction apparatus. It is sectional drawing of a camera unit. It is a perspective view of an image blur correction device. It is a disassembled perspective view of an image blur correction apparatus. It is sectional drawing of an image blur correction apparatus. It is a perspective view which shows a part (movable holding member etc.) of an image shake correction apparatus. It is a perspective view which shows a part (movable holding member etc.) of an image shake correction apparatus. 2 is a front view showing a part (a base or the like) of the image blur correction device. FIG. It is a rear view which shows a part (base etc.) of an image blur correction apparatus. It is a front view showing a part (movable holding member, base, etc.) of the image blur correction device. It is a rear view which shows some image blur correction apparatuses (a base, a movable holding member, etc.). It is a perspective view which shows the state before and behind the assembly at the time of assembling a flexible wiring board and a yoke with respect to a base. (A), (b), (c) is a top view explaining operation | movement of an image blur correction apparatus. (A), (b), (c) is a top view explaining operation | movement of an image blur correction apparatus.

Explanation of symbols

L1, L2 Optical axis PH Portable information terminal PH1 Housing PH2 Display unit PH3 Operation button PH4 Shooting window U Camera unit 10 Unit case 11 Projection part 12, 13, 14, 15 Holding part 20 Prism G1, G2, G3, G4 G5, G6 Lens 30 First movable lens group 31 Lens holding member 32 Guided portion 33 Restricted portion 34 U-shaped engaging portion 40 Filter 50 CCD
60 First drive unit 61 Guide shaft 62 Non-rotating shaft 63 Lead screw 64 Motor 65 Nut 66 Coil spring 70 Second drive unit 71 Guide shaft 73 Lead screw 74 Motor 75 Nut 80 Angular velocity sensor 90 Control unit 91 Control units 92 and 93 Motor Drive circuit 94 CCD drive circuit 95 Drive circuit 96 Position detection circuit 97 Angular velocity detection circuit M Image blur correction device B Screw S1, S2, S3, S4 Straight line S3 'Straight line (second direction)
S4 'straight line (first direction)
100 base 100a opening C1 center of opening 100b, 100c, 100d, 100e, 100f, 100g fitting concave portion 101 guided portion 102 regulated portion 103 U-shaped engaging portion 104 concave portion 105 connecting pin 106 screw hole 110 Movable holding member 110a Holding part 111 Extending part 112, 113 Fitting hole 114 Contact surface 115 Connection notch part 116 Connection long hole part 117 Positioning protrusion 120 First drive mechanism (drive means)
121 1st coil 122 1st drive magnet 130 2nd drive mechanism (drive means)
131 Second coil 132 Second drive magnet 141, 142 Yoke 141a Notch portion 141b Bend portion 141c Screw hole 150 Sphere (support mechanism)
161 First return magnet (return means)
162 Second return magnet (return means)
171 First magnetic sensor (position detecting means)
172 Second magnetic sensor (position detecting means)
180 Flexible wiring board 181, 182, 183, 184 connection part

Claims (8)

A base having an opening, a movable holding member for holding the lens, a support mechanism for supporting the movable holding member in a plane perpendicular to the optical axis of the lens, and driving the movable holding member in the plane An image blur correction apparatus comprising: a driving unit that performs position detection; a position detection unit that detects a position of the movable holding member; and a return unit that returns the movable holding member to a predetermined pause position in a pause state,
The driving means includes a coil fixed to the base and a driving magnet fixed to the movable holding member at a position facing the coil.
The return means includes a return magnet fixed to the base so as to generate a magnetic force for returning to a rest position facing the drive magnet.
An image blur correction apparatus characterized by that. The return magnet is disposed so as to face the drive magnet with the coil interposed therebetween.
The image blur correction apparatus according to claim 1, wherein: The position detection means includes a magnetic sensor fixed to the base so as to face the drive magnet.
The image blur correction apparatus according to claim 2, wherein Including a flexible wiring board electrically connected to the coil and the magnetic sensor;
The flexible wiring board is disposed adjacent to the base on the side opposite to the side on which the movable holding member faces,
The image blur correction apparatus according to claim 3. The driving means includes a plate-like yoke disposed adjacent to bend and fix the flexible wiring board,
The image blur correction apparatus according to claim 4, wherein: The drive means includes a first drive mechanism that drives in a first direction in the plane and a second drive mechanism that drives in a second direction in the plane,
The coil includes a first coil included in the first drive mechanism and a second coil included in the second drive mechanism,
The drive magnet includes a first drive magnet that is included in the first drive mechanism and faces the first coil, and a second drive magnet that is included in the second drive mechanism and faces the second coil,
The return magnet includes a first return magnet that faces the first drive magnet and a second return magnet that faces the second drive magnet,
The magnetic sensor includes a first magnetic sensor facing the first drive magnet and a second magnetic sensor facing the second drive magnet.
The image blur correction apparatus according to claim 3, wherein the image blur correction apparatus is an image blur correction apparatus according to claim 3. In an imaging lens unit including a plurality of lenses for imaging,
Including the image blur correction device according to claim 1,
An imaging lens unit characterized by that. In a camera unit including an image sensor,
Including the image blur correction device according to claim 1,
A camera unit characterized by that.

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