JP2010085734A - Image blur correction device, imaging lens unit, and camera unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image blur correction device which can be mounted on a camera unit of a cellular phone or the like, and can accurately correct image blur caused by camera shake or the like while simplifying structure, and reducing the size and thickness or the like of the device in an optical axis direction of a lens and in a direction perpendicular to the optical axis direction, and to provide an imaging lens unit and a camera unit including the image blur correction device. <P>SOLUTION: The image blur correction device includes: a base 100 having an aperture; a movable holding member 110 holding the lens; and first and second drive mechanisms 130 and 140 driving the movable holding member in first and second directions perpendicular to an optical axis. The image blur correction device also includes: a first guide shaft 122 that is fixed to the base and elongated in the direction perpendicular to the optical axis; a cylindrical member 121 into which the first guide shaft is inserted; an engaging part 116 that has a slot 116a into which the first guide shaft is inserted, and is formed on the movable holding member so as to be engaged with both ends of the cylindrical member; a second guide shaft 123 that is fixed to the base; and a second engaging part 117 that has a slot 117a into which the second guide shaft is inserted, and is formed on the movable holding member as a supporting mechanism of the movable holding member. <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 so as to reciprocate 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.

JP 2007-286318 A JP 2008-64846 A

  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. An image blur correction apparatus that can be mounted on a camera unit such as a mobile phone and can correct image blur due to camera shake with high accuracy, and an imaging lens unit and a camera provided with the image blur correction apparatus To provide a unit.

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 first drive mechanism that drives a member in a first direction perpendicular to the optical axis; and a second drive mechanism that drives a movable holding member in a second direction perpendicular to the optical axis, The support mechanism includes a first guide shaft fixed to the base and extending in a first guide direction perpendicular to the optical axis, a first guide shaft slidably inserted, and a movable holding member in the first guide direction. A cylindrical member that moves integrally and engages the movable holding member so as to allow relative movement of the movable holding member in the first guide direction and the second guide direction perpendicular to the optical axis; Engage and second guide An engagement portion formed on the movable holding member to allow relative movement of the movable holding member in the direction, and a regulation guide that guides the movable holding member while restricting the tilting with respect to a plane perpendicular to the optical axis. Including.
According to this configuration, the movable holding member is arranged in the first guide direction and the second guide direction, that is, in a plane perpendicular to the optical axis, by the first guide shaft, the cylindrical member, the engaging portion, and the restriction guide as the support mechanism. Two-dimensionally supported by the first driving mechanism and the second driving mechanism without rotating the lens in a plane perpendicular to the optical axis with respect to the base (regulating the tilt). Therefore, image blur due to camera shake or the like can be corrected with high accuracy.
Here, the first drive mechanism and the second drive mechanism need only drive one movable holding member instead of the conventional two-stage configuration, and the movable holding member can be stably and smoothly in a plane perpendicular to the optical axis. Can be driven.
Further, since the support mechanism is constituted by the first guide shaft fixed to the base, the cylindrical member, the engaging portion formed on the movable holding member, and the regulation guide, the structure is simplified, and the device in the optical axis direction is simplified. Thinning and the like can be achieved.

The said structure can employ | adopt the structure which has an elongate hole or notch which an engaging part penetrates a 1st guide shaft and is extended in a 2nd guide direction.
According to this configuration, since the engaging portion has the long hole or the notch through which the first guide shaft is inserted, the movable holding member is dropped after the first guide shaft is inserted into the long hole or the notch and incorporated. Etc. can be prevented or assembly can be facilitated.

In the above configuration, the movable holding member may include a configuration including two engaging portions that engage with both end surfaces of the cylindrical member.
According to this configuration, the cylindrical member can be assembled to the two engaging portions and the first guide shaft can be simply passed through the cylindrical member and the two engaging portions, thereby simplifying the structure, simplifying the assembling operation, and the like. Can be achieved.

In the above configuration, the restriction guide is fixed to the base and is movable and held so as to be engaged with the second guide shaft and restricted in movement in the optical axis direction by being extended in parallel with the first guide direction. The structure including the 2nd engaging part formed in the member is employable.
According to this configuration, the second guide shaft fixed to the base is engaged with the second engagement portion of the movable holding member. For example, when the engagement portion has a long hole, the second guide shaft is connected to the second guide shaft. The tilt of the movable holding member can be restricted by simply inserting the engaging portion into the long hole and fixing it to the base, thereby achieving simplification of the structure, simplification of assembly work, and the like.

In the above configuration, the base and the movable holding member are formed in a substantially rectangular flat plate shape in which the regions facing each other are substantially flat in the optical axis direction and long in the second guide direction. Fixed to one end side of the base in the guide direction, the second guide shaft is fixed to the other end side of the base in the second guide direction, and the engaging portion is provided on one end side of the movable holding member in the second guide direction. The second engagement portion may employ a configuration provided on the other end side of the movable holding member in the second guide direction.
According to this configuration, the movable holding member can be moved with high accuracy in a plane perpendicular to the optical axis while achieving thinning (miniaturization) of the device in the first guide direction and thinning of the device in the optical axis direction. Thus, image blur due to camera shake or the like can be corrected easily and with high accuracy.

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. In addition, the image can be corrected with high accuracy, and a good captured image can be obtained by the image sensor.

  According to the image shake correction apparatus having the above-described configuration, it is mounted on a cellular phone or the like 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 is possible to obtain an image shake correction device that can be applied to a camera unit and can correct image shake due to camera shake or the like with high accuracy, and to obtain an imaging lens unit and a camera unit including the image shake correction device. be able to.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the accompanying drawings.
1 to 14 show an embodiment of an image shake correction apparatus according to the present invention. FIG. 1 is a perspective view showing a portable information terminal equipped with a camera unit in which the image shake correction apparatus is incorporated. 2 is a perspective view showing the camera unit, FIG. 3 is a system diagram of the camera unit, FIG. 4 is a cross-sectional view of the camera unit, FIG. 5 is a perspective view of the image blur correction device, and FIG. 6 is an exploded perspective view of the image blur correction device. 7 is a cross-sectional view of the image blur correction device, FIG. 8 is a perspective view showing a part of the image blur correction device, FIG. 9 is a plan view of the image blur correction device, and FIGS. 10 (a), 10 (b), and 10 (c). ) Is a partial cross-sectional view showing a part of the image blur correction device, FIG. 11 is a plan view in which a part of the image blur correction device is omitted, and FIG. 12 is a schematic diagram showing a magnetic circuit such as a drive mechanism included in the image blur correction device. Figures 13 (a), (b), (c) and 14 (a), (b), (c) Is a plan view for explaining the operation of the shake correction apparatus.

  A camera unit U incorporating this image blur correction device is mounted on a flat and small portable information terminal P as shown in FIG. The portable information terminal P includes a housing P1 that is substantially rectangular and has a flat outline, a display portion P2 such as a liquid crystal panel that displays various information disposed on the surface of the housing P1, operation buttons P3, and a display portion P2. A photographing window P4 formed on the opposite surface is provided. As shown in FIG. 1, the camera unit U is housed in the housing P1 so as to extend in a direction perpendicular to the optical axis L1 of the subject light entering from the photographing window P4.

  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 shake 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 shake correction). The apparatus includes a second drive unit 70 for driving the apparatus M) in the direction of the optical axis L2, a control system 80, and the like.

As shown in FIG. 2, the unit case 10 is formed in a flat and 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. And a holding part 12 that holds the lens G1, a holding part 13 that holds the lens G6, a holding part 14 that holds the filter 40, a holding part 15 that holds the CCD 50, and the like. .
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 P4 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.

2 and 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 FIGS.
As shown in FIGS. 2 and 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 coil spring 66 that exerts an urging force that constantly urges toward the end.

  As shown in FIGS. 2 and 3, the second drive unit 70 includes a guide shaft 71 and a detent shaft 72 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. 73, a motor 74 that rotationally drives the lead screw 73, a nut 75 that is screwed to the lead screw 73 and contacts the U-shaped engaging portion 106 of the base 100 included in the second movable lens group, and a U-shaped engaging portion A coil spring 76 or the like that exerts an urging force that constantly urges 106 toward the nut 74 is provided.

  As shown in FIG. 3, the control system 80 includes a microcomputer 81 that performs arithmetic processing and processes various signals to generate command signals, a drive circuit 82 that drives the motor 64 of the first drive unit 60, and a second drive. A drive circuit 83 for driving the motor 74 of the unit 70, a CCD drive circuit 84 for driving the CCD 50, a drive circuit 85 for driving the first drive mechanism 130 and the second drive mechanism 140 included in the image blur correction device M, and image blur correction. A first detection unit 170 for detecting the position of the movable holding member 110 included in the apparatus M, a position detection circuit 86 connected to the second detection unit 180, an angular velocity detection circuit 87 for detecting vibration and shake received by the camera unit U, etc. It has.

As shown in FIGS. 2 to 4, 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 optical axis L2 direction, and moves in the optical axis L2 direction. It is supported freely.
As shown in FIGS. 5 to 7, the image blur correction device M includes the base 100, the movable holding member 110, the cylindrical member 121 that forms part of the support mechanism, the first guide shaft 122, and a part of the regulation guide. The first drive mechanism 130 including the second guide shaft 123, the first magnet 131, the first coil 132, and the first yokes 133 and 134, the second magnet 141, the second coil 142, and the second yokes 143 and 144 are included. 2 drive mechanism 140, flexible wiring board 150, cover member 160, first detection unit 170 including sensor 171 and magnet 172, second detection unit 180 including sensor 181 and magnet 182, and the like.

  As shown in FIGS. 6 to 10 and 12, the base 100 is substantially flat in the optical axis L2 direction, narrow in the direction of a straight line S1 perpendicular to the optical axis L2 and parallel to the optical axis L1, and the optical axis L2 And a substantially rectangular flat plate that is elongated in the direction of the straight line S2 orthogonal to the straight line S1, and a fitting that fits and fixes the circular opening 101 and the first magnet 131 centered on the optical axis L2. A fitting hole 102 ′ for fitting and fixing the hole 102 and the first yoke 133; a fitting hole 103 for fitting and fixing the second magnet 141; and a fitting hole 103 ′ for fitting and fixing the second yoke 143; A guided portion 104 that is slidably engaged with and guided by the guide shaft 71, a regulated portion 105 that is slidably engaged with the rotation-preventing shaft 72 and is restricted from rotating around the optical axis L 2, and a lead screw Nut 75 screwed to 73 abuts U-shaped engaging portion 106, fitting hole 107 for fitting and fixing the first guide shaft 122, fitting hole 108 for fitting and fixing the second guide shaft 123, and fixing for fixing the cover member 160 Part 109 and the like.

The opening 101 has an inner diameter dimension that allows the cylindrical portion 110a to pass through in a non-contact manner within a range in which the movable holding member 110 is driven.
As shown in FIG. 11, the fitting hole 102 (and the fitting hole 102 ′) is long in the direction of the straight line S3 that forms 45 degrees with the straight line S2 and narrow in the direction of the straight line S4 ′ that is perpendicular to the straight line S3. It is formed in a substantially rectangular shape.
As shown in FIG. 11, the fitting hole 103 (and the fitting hole 103 ′) is long in the direction of the straight line S4 that forms 45 degrees with the straight line S2 and narrow in the direction of the straight line S3 ′ perpendicular to the straight line S4. It is formed in a substantially rectangular shape.
And the fitting hole 102 (and fitting hole 102 ') and fitting hole 103 (and fitting hole 103') are formed in line symmetry with respect to the straight line S1, as shown in FIG.
That is, the first magnet 131 and the first yoke 133 and the second magnet 141 and the second yoke 143 are arranged symmetrically with respect to the straight line S1 on the base 100.

  As shown in FIGS. 6 to 11, the movable holding member 110 is substantially flat except for a part in the direction of the optical axis L2, and is narrow in the direction of the straight line S1 orthogonal to the optical axis L2 and parallel to the optical axis L1. Are formed in a substantially rectangular flat plate shape elongated in the direction of the straight line S2 orthogonal to the optical axis L2 and the straight line S1, and the circular cylindrical part 110a centering on the optical axis L2 and the straight line S2 across the cylindrical part 110a Plate portion 111 extending on both sides in the direction, fitting hole 112 for fitting and fixing the first coil 132, fitting hole 113 for fitting and fixing the second coil 142, and magnet 172 of the first detection unit 170 A fitting hole 114 for fitting and fixing, a fitting hole 115 for fitting and fixing the magnet 182 of the second detection unit 180, and two engaging portions forming part of a support mechanism through which the first guide shaft 122 is inserted. 116, second guide shaft 1 3 is provided with a like second engaging portion 117 forming a part of the regulating guide to be inserted.

As shown in FIG. 11, the fitting hole 112 (and the fitting hole 114) is long in the direction of the straight line S3 forming 45 degrees with the straight line S2 and narrow in the direction of the straight line S4 ′ perpendicular to the straight line S3. It is formed in a rectangular shape.
As shown in FIG. 11, the fitting hole 113 (and the fitting hole 115) is long in the direction of the straight line S4 that forms 45 degrees with the straight line S2, and narrow in the direction of the straight line S3 ′ perpendicular to the straight line S4. It is formed in a rectangular shape.
And the fitting hole 112 (and fitting hole 114) and the fitting hole 113 (and fitting hole 115) are formed in line symmetry with respect to the straight line S1, as shown in FIG.
That is, the first coil 132 and the magnet 172, the second coil 142 and the magnet 182 are arranged symmetrically with respect to the straight line S <b> 1 on the movable holding member 110.

The two engaging portions 116 are formed on one end side of the movable holding member 110 in the direction of the straight line S2 (second guide direction), and each penetrates coaxially in the direction of the straight line S1 (first guide direction). In addition, a long hole 116a extending in the direction of the straight line S2 (second guide direction) is defined.
The long hole 116a of the engaging portion 116 is formed to have a dimension that allows the first guide shaft 122 to be in close contact in the optical axis L2 direction and to move in the direction of the straight line S2 (second guide direction).
The end surface 116b of the engaging portion 116 is in contact with both end surfaces 121b of the cylindrical member 121, and relative movement in the direction of the straight line S1 is restricted, and relative to the direction of the straight line S2 (second guide direction). Is slidably formed.
The second engaging portion 117 is formed on the other end side of the movable holding member 110 in the direction of the straight line S2 (second guide direction), penetrates in the direction of the straight line S1 (first guide direction), and is straight line S2. A long hole 117a extending in the direction (second guide direction) is defined.
The long hole 117a is formed in such a size that the second guide shaft 123 is in close contact in the optical axis L2 direction and can move in the direction of the straight line S2 (second guide direction).

As shown in FIGS. 5 to 9, the cylindrical member 121 is formed in a cylindrical shape that extends in the direction of the straight line S <b> 1 (first guide direction), and a circular shape through which the first guide shaft 122 is slidably inserted. Through-holes 121a and both end surfaces 121b formed as flat surfaces.
As shown in FIGS. 5 to 9, the first guide shaft 122 has a circular cross section and extends in the direction of the straight line S1 so as to define the first guide direction, and both ends thereof are straight lines S2. Is fitted into a fitting hole 107 formed on one end side of the base 100 in this direction (second guide direction).
As shown in FIGS. 5 to 9, the second guide shaft 123 has a circular cross section and is formed to extend in the direction of the straight line S1, and both end portions thereof are in the direction of the straight line S2 (second guide direction). The base 100 is fitted and fixed in a fitting hole 108 formed on the other end side.

That is, the first guide shaft 122 is inserted into the two long holes 116 a and the through holes 121 a in a state where the cylindrical member 121 is fitted between the two engaging portions 116, and both ends thereof are fitting holes of the base 100. 107 is fixed by fitting. The second guide shaft 123 is inserted into the long hole 117 a of the engaging portion 117, and both ends thereof are fitted and fixed to the fitting holes 108 of the base 100.
Thus, the movable holding member 110 is supported by the support mechanism including the first guide shaft 122, the cylindrical member 121, the two engaging portions 16, and the regulation guide (the second guide shaft 123 and the second engaging portion 117). The first guide direction and the second guide direction, that is, a state of being supported so as to be movable in a plane perpendicular to the optical axis L 2, and light is applied to the base 100 by the driving force of the first driving mechanism 130 and the second driving mechanism 140. It is moved two-dimensionally in a plane perpendicular to the axis L2, and image blur due to camera shake or the like is corrected with high accuracy.

Here, the support mechanism includes a first guide shaft 122 fixed to the base 100, a cylindrical member 121, an engaging portion 116 formed on the movable holding member 110, a second guide shaft 123 that is a restriction guide, and a second engagement. Since the joint portion 117 is used, the structure is simplified, the apparatus is thinned in the optical axis direction, and the like.
Further, since the engaging portion 116 has a long hole 116a through which the first guide shaft 122 is inserted, after the first guide shaft 122 is inserted into the long hole 116a and incorporated, the movable holding member 110 can be securely removed. Can be prevented.
Furthermore, since the movable holding member 110 includes two engaging portions 116 that engage with both end surfaces 121b of the cylindrical member 121, the cylindrical member 121 is fitted into the two engaging portions 116, and the first guide shaft 122 is connected to the cylindrical member. It can be assembled simply by passing it through 121 and the two engaging portions 116, and the simplification of the structure, the simplification of the assembling work, and the like are achieved.

  As a restriction guide, the second guide shaft 123 fixed to the base 100 and extending parallel to the direction of the straight line S1 (first guide direction) is engaged with the second guide shaft 123 to restrict movement in the optical axis L2 direction. By adopting the second engaging portion 117 formed on the movable holding member 110 as much as possible, the second engaging portion 117 of the movable holding member 110 is engaged with the second guide shaft 123 fixed to the base 100. Here, the inclination of the movable holding member 110 can be restricted by simply inserting the second guide shaft 123 into the long hole 117a of the second engaging portion 117 and fixing it to the base 100, thereby simplifying and assembling the structure. Simplification of work is achieved.

  In addition, the base 100 and the movable holding member 110 have a long, substantially rectangular shape in which the regions facing each other are substantially flat in the optical axis L2 direction and have one end side and the other end side in the direction of the straight line S2 (second guide direction). The first guide shaft 122 is fixed to one end side of the base 100, the second guide shaft 123 is fixed to the other end side of the base 100, and the engaging portion 116 is one end side of the movable holding member 110. Since the second engagement portion 117 is provided on the other end side of the movable holding member 110, the apparatus is thinned (downsized) in the direction of the straight line S1 (first guide direction) and the optical axis L2. The thickness of the apparatus in the direction can be reduced, and the movable holding member 110 can be moved with high accuracy in a plane perpendicular to the optical axis L2, so that image blur due to camera shake or the like can be easily corrected with high accuracy.

As shown in FIGS. 5 to 7, 9, and 10, the cover member 160 is disposed so as to sandwich the movable holding member 110 in the direction of the optical axis L <b> 2, and is fixed to the base 100. On both sides of the opening 160a, the opening 160a, the fitting recess 161 for fitting and fixing the first yoke 134, the fitting hole 162 for fitting and fixing the sensor 171 and the second yoke 144 are fitted. A fitting recess 163 for fixing, a fitting hole 164 for fitting and fixing the sensor 181 and the like are provided.
The opening 160a is formed with an inner diameter that allows the cylindrical portion 110a to pass through in a non-contact manner within a range in which the movable holding member 110 is driven.
The fitting hole 162 is formed at a position where the sensor 171 faces the magnet 172 in a state where the cover member 160 and the movable holding member 110 are assembled to the base 100.
The fitting hole 164 is formed at a position where the sensor 181 faces the magnet 182 in a state where the cover member 160 and the movable holding member 110 are assembled to the base 100.

As shown in FIGS. 6 and 7, the first drive mechanism 130 is formed as a voice coil motor including a first magnet 131, a first coil 132, and first yokes 133 and 134.
As shown in FIG. 11, the first magnet 131 is formed in a long rectangular shape in the direction of the straight line S <b> 3, and is fitted and fixed in the fitting hole 102 of the base 100. The first magnet 131 is magnetized into an N pole and an S pole with a plane passing through the straight line S3 as a boundary.
As shown in FIG. 11, the first coil 132 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 ′. 112 is fitted and fixed. And the 1st coil 132 is arrange | positioned so that the long axis may make a 45 degree | times inclination angle with respect to the straight line S2.
The first yoke 133 is formed in a rectangular shape having an area equal to or larger than that of the first magnet 131 in contact with the first magnet 131 and extending in the direction of the straight line S3, as shown in FIG. The fitting hole 102 'is fitted and fixed.
The first yoke 134 is formed in a rectangular flat plate shape having an area larger than that of the first coil 132, and is disposed with a predetermined gap in the optical axis L2 direction from the first coil 132. 161 is fitted and fixed.
The first drive mechanism 130 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 132. .

As shown in FIGS. 6 and 7, the second drive mechanism 140 is formed as a voice coil motor including a second magnet 141, a second coil 142, and second yokes 143 and 144.
As shown in FIG. 11, the second magnet 141 is formed in a rectangular shape that is long in the direction of the straight line S <b> 4, and is fitted and fixed in the fitting hole 103 of the base 100. The second magnet 141 is magnetized into an N pole and an S pole with a plane passing through the straight line S4 as a boundary.
As shown in FIG. 11, the second coil 142 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 ′, and the fitting hole of the movable holding member 110. 113 is fixed by fitting. And the 2nd coil 142 is arrange | positioned so that the major axis may make a 45 degree | times inclination angle with respect to the straight line S2.
The second yoke 143 has an area equal to or larger than that of the second magnet 141 in contact with the second magnet 141 and is formed in a long rectangular shape in the direction of the straight line S4. As shown in FIG. The fitting hole 103 'is fitted and fixed.
The second yoke 144 is formed in a rectangular flat plate shape having an area larger than that of the second coil 142, and is disposed with a predetermined gap in the direction of the optical axis L2 from the second coil 142. 163 is fitted and fixed.
The second driving mechanism 140 generates electromagnetic driving 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 142. .

As shown in FIG. 11, the first drive mechanism 130 and the second drive mechanism 140 are arranged with respect to a straight line S1 orthogonal to the optical axis L2 of the lenses G3, G4, and G5 held by one movable holding member 110. Since they are arranged in line symmetry, the driving loads received by each are the same, and the driving force is exerted on both sides of the lenses G3, G4, G5, so that the movable holding member 110 is placed in a plane perpendicular to the optical axis L2. It can be driven stably and smoothly.
In addition, since the first coil 132 and the second coil 142 are arranged such that their long axes form a predetermined inclination angle with respect to the straight line S2, the movable holding member 110 is elongated in the direction of the straight line S2. In the case of the shape, by tilting the first coil 132 and the second coil 142, the dimension of the movable holding member 110 can be reduced in the direction of the straight line S1, and the direction perpendicular to the optical axis L2 (the straight line S1). The size and thickness of the device in the direction can be reduced.

In addition, the movable holding member 110 is disposed such that the cylindrical portion 110a is inserted into the opening 101 of the base 100 and the flat plate portions 111 on both sides are adjacent to and opposed to the base 100 in the optical axis L2 direction. Even when the lenses G3, G4, and G5 are held, the movable holding member 110 can be disposed closer to the base 100, and the apparatus can be thinned in the direction of the optical axis L2.
Further, the first magnet 131 and the second magnet 141 are fixed to the base 100, and the first coil 132 and the second coil 142 are fixed to the movable holding member 110, that is, the movable holding the lenses G3, G4, G5. Since the first coil 132 and the second coil 142 are fixed to the holding member 110, when the number of turns of the first coil 132 and the second coil 142 is changed according to the specifications (number of sheets, weight, etc.) of the lens. It can be modularized according to the specifications.

As shown in FIGS. 2, 5, and 6, the flexible wiring board 150 is connected to the connection portion 151 connected to the first coil 132 of the first drive mechanism 130 and the sensor 171 of the first detection unit 170. Part 152, a connection part 153 connected to the second coil 142 of the second drive mechanism 140, and a connection part 154 connected to the sensor 181 of the second detection unit 180, which are bent and arranged around the base 100. It is installed.
As shown in FIGS. 2 and 3, the flexible wiring board 150 is disposed in the unit case 10 so as to be bendable, and is electrically connected to the drive circuit 85 and the position detection circuit 86.

The first detection unit 170 includes, for example, a sensor 171 such as a Hall element that detects a change in magnetic flux density and outputs it as an electric signal, and a magnet 172 disposed to face the sensor 171. The sensor 171 is fitted and fixed in the fitting hole 162 of the cover member 160. The magnet 172 is fitted and fixed in the fitting hole 114 of the movable holding member 110.
The first detection unit 170 detects a change in magnetic flux density caused by the movement of the movable holding member 110 relative to the base 100 and the cover member 160 (the magnet 172) in the region of the first drive mechanism 130. By detecting this, a change in position is detected.

The second detection unit 180 includes, for example, a sensor 181 such as a Hall element that detects a change in magnetic flux density and outputs it as an electric signal, and a magnet 182 arranged to face the sensor 181. The sensor 181 is fitted and fixed in the fitting hole 164 of the cover member 160. The magnet 182 is fitted and fixed in the fitting hole 115 of the movable holding member 110.
Then, the second detection unit 170 detects a change in magnetic flux density caused by the movement of the movable holding member 110 relative to the base 100 and the cover member 160 (the magnet 182) in the region of the second drive mechanism 140. By detecting this, a change in position is detected.
In the first detection unit 170, the second detection unit 180, the first drive mechanism 130, and the second drive mechanism 140 having the above-described configuration, a magnetic circuit (flow of lines of magnetic force) as shown in FIG. 12 is formed.

Next, the correction operation of the image blur correction apparatus M will be briefly described with reference to FIGS.
First, as shown in FIG. 13A, as an example, the movable holding is performed from the state where the center of the opening 101 of the base 100 and the optical axis L2 of the lenses G3, G4, and G5 on the movable holding member 110 coincide with each other. When the member 110 (lenses G3, G4, G5) is shifted upward, the first driving mechanism 130 is caused to generate a driving force obliquely upward in the first direction (the direction of the straight line S4 ′), and the second driving mechanism. In 140, a driving force is generated obliquely upward 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. 13B.
In addition, when the movable holding member 110 (lenses G3, G4, G5) is shifted downward as an example from the state shown in FIG. 13A, the first drive mechanism 130 is moved in the first direction (direction of the straight line S4 ′). The second driving mechanism 140 generates a driving force diagonally downward 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. 14A, the center of the opening 101 of the base 100 and the optical axis L2 of the lenses G3, G4, and G5 on the movable holding member 110 coincide with each other as an example. When the holding member 110 (lenses G3, G4, G5) is shifted to the right side, the first driving mechanism 130 is caused to generate a driving force obliquely downward in the first direction (the direction of the straight line S4 ′), and the second driving. The mechanism 140 is caused to generate a driving force obliquely 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.
Further, when the movable holding member 110 (lenses G3, G4, G5) is shifted to the left as an example from the state shown in FIG. 14A, the first drive mechanism 130 is moved in the first direction (direction of the straight line S4 ′). The second driving mechanism 140 generates a driving force obliquely 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.

FIG. 15 shows another embodiment of the image blur correction device according to the present invention, which is the same as the above-described embodiment except that the shape of the engaging portion of the movable holding member is changed, and has the same configuration. Are denoted by the same reference numerals and description thereof is omitted.
That is, as shown in FIG. 15, the movable holding member 110 ′ in this embodiment is substantially flat except for a part in the direction of the optical axis L2, and the direction of the straight line S1 perpendicular to the optical axis L2 and parallel to the optical axis L1. Are formed in a substantially rectangular flat plate shape that is long in the direction of the straight line S2 orthogonal to the optical axis L2 and the straight line S1, and includes a cylindrical portion 110a, a flat plate portion 111, a fitting hole 112, and a fitting hole 113. , The fitting hole 114, the fitting hole 115, two engaging portions 116 ′ forming a part of a support mechanism through which the first guide shaft 122 is inserted, and a part of a regulation guide through which the second guide shaft 123 is inserted. A second engagement portion 117 and the like are provided.

As shown in FIG. 15, the two engaging portions 116 ′ are formed on one end side of the movable holding member 110 ′ in the direction of the straight line S <b> 2 (second guide direction), similarly to the case shown in FIG. 8. A notch 116a ′ that extends coaxially in the direction of the straight line S1 (first guide direction) and that extends outward in the direction of the straight line S2 (second guide direction) extends in a U shape (or a U shape). Is defined.
The notch 116a ′ of the engaging portion 116 ′ is formed to have a size such that the first guide shaft 122 is in close contact with the optical axis L2 and can be moved in the direction of the straight line S2 (second guide direction).
The end surface 116b of the engaging portion 116 ′ is in contact with both end surfaces 121b of the cylindrical member 121 in the same manner as in the above-described embodiment, so that the relative movement in the direction of the straight line S1 is restricted, and the direction of the straight line S2 It is formed to be relatively slidable in the (second guide direction).

  Also in this embodiment, the support mechanism includes the first guide shaft 122 fixed to the base 100, the cylindrical member 121, the engaging portion 116 ′ formed on the movable holding member 110 ′, and the regulation guide (second engaging portion). 117 and the second guide shaft 123), the structure can be simplified, the apparatus can be thinned, and the like.

FIG. 16 shows still another embodiment of the image blur correction device according to the present invention, which is the same as the above-described embodiment except that the shape of the engaging portion of the movable holding member is changed. The components are denoted by the same reference numerals and description thereof is omitted.
That is, as shown in FIG. 16, the movable holding member 110 ″ in this embodiment is substantially flat except for a part in the direction of the optical axis L2, and is a straight line S1 orthogonal to the optical axis L2 and parallel to the optical axis L1. It is formed in a substantially rectangular flat plate shape that is narrow in the direction and long in the direction of the straight line S2 orthogonal to the optical axis L2 and the straight line S1, and includes a cylindrical portion 110a, a flat plate portion 111, a fitting hole 112, and a fitting hole. 113, the fitting hole 114, the fitting hole 115, the two engaging portions 116 that form part of the support mechanism through which the first guide shaft 122 is inserted, and the regulation guide through which the second guide shaft 123 is inserted. A second engagement portion 117 ″ and the like are provided.

As shown in FIG. 16, the second engaging portion 117 ″ is formed on the other end side of the movable holding member 110 ″ in the direction of the straight line S2 (second guide direction), as in the case shown in FIG. A notch 117a ″ that extends in a U-shape (or a U-shape) that penetrates in the direction of the straight line S1 (first guide direction) and opens outward in the direction of the straight line S2 (second guide direction). Is defined.
The notch 117a ″ of the second engaging portion 117 ″ is formed to have a dimension that allows the second guide shaft 123 to be closely contacted in the optical axis L2 direction and to move in the direction of the straight line S2 (second guide direction). Has been.

  Also in this embodiment, the support mechanism includes the first guide shaft 122 fixed to the base 100, the cylindrical member 121, the engaging portion 116 formed on the movable holding member 110 ″, and the regulation guide (second engaging portion). 117 ″ and the second guide shaft 123), the structure can be simplified, the apparatus can be thinned, and the like.

In the above-described embodiment, the case where the two engaging portions 116 and 116 ′ that engage the both end surfaces 121 b of the cylindrical member 121 as the support mechanism are employed has been described, but the present invention is not limited to this. Other configurations may be adopted as long as the relative movement between the cylindrical member and the movable holding member in the guide direction can be restricted.
In the above-described embodiment, the second guide shaft 123 and the second engaging portions 117 and 117 ″ are employed as the regulation guides, but the present invention is not limited to this, and the second guide shaft 123 and the second engagement shaft are not limited thereto. The engagement portions 117, 117 ″ are eliminated, the first guide shaft is formed into a modified cross section, the cylindrical member is formed to have a through hole having a modified cross section, and the engagement portion is formed only in the second guide direction with the cylindrical member. By adopting a relatively movable form, the movable holding member can be moved two-dimensionally in a plane perpendicular to the optical axis while restricting the inclination of the movable holding member with respect to the plane perpendicular to the optical axis. it can.
In the said embodiment, although the case where the 2nd guide shaft 123 and the 2nd engaging part 117,117 '' were employ | adopted as a regulation guide was shown, it is not limited to this, Base 100 and a cover member Protrusions that protrude from 160 in the direction of the optical axis L2 and abut against the movable holding member may be provided.
In the said embodiment, although the substantially elliptical 1st coil and 2nd coil were shown, it is good also as a substantially rectangular annular coil which consists of a long side and a short side including not only this but a linear part.

In the above-described embodiment, an image shake correction apparatus has been described. However, a configuration including an image shake correction apparatus having the above-described configuration may be employed in an imaging lens unit including a plurality of imaging lenses.
According to this, in a configuration in which a plurality of lenses for imaging are arranged in the optical axis direction, the correction is held by the movable holding members 110, 110 ′, 110 ″ by including the image blur correction device. The lenses G3, G4, and G5 are 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 the simplification of the structure, the downsizing and thinning of the apparatus in the optical axis direction of the lens and the direction perpendicular to the optical axis direction, etc. Since image blur can be corrected with high accuracy, it can of course be applied to a camera unit mounted on a portable information terminal such as a mobile phone or a portable music player that is required to be reduced in size and thickness. This is also useful for ordinary digital cameras 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 system diagram of a camera unit. 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 some image blur correction apparatuses (a movable holding member, a 1st guide shaft, a cylinder member). 3 is a plan view of the image blur correction device. FIG. 9 is a partial cross-sectional view of the image blur correction apparatus shown in FIG. 9, wherein (a) is a partial cross-sectional view at E1-E1 in FIG. 9, and (b) is a partial cross-sectional view at E2-E2 in FIG. (C) is the fragmentary sectional view in E3-E3 in FIG. FIG. 6 is a plan view in which a part of the image blur correction device (a cover member and a flexible wiring board) is omitted. It is a schematic diagram which shows the magnetic circuit (flow of a magnetic force line) in an image blurring correction apparatus. (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. It is a perspective view which shows the movable holding member in other embodiment of the image blur correction apparatus which concerns on this invention. It is a perspective view which shows the movable holding member in other embodiment of the image blurring correction apparatus which concerns on this invention.

Explanation of symbols

L1, L2 Optical axis P Portable information terminal P1 Case P2 Display unit P3 Operation button P4 Shooting window U Camera unit 10 Unit case 11 Protruding 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 rotation prevention shaft 63 lead screw 64 motor 65 nut 66 coil spring 70 second drive unit 71 guide shaft 72 rotation prevention shaft 73 lead screw 74 motor 75 nut 76 coil spring 80 control system 81 microcomputer 82, 83 Motor drive circuit 84 CCD drive circuit 85 Drive circuit 86 Position detection circuit 87 Angular velocity detection circuit M Image blur correction device S1 Straight line (first guide direction)
S2 straight line (second guide direction)
S3 straight line S3 'straight line (second direction)
S4 straight line S4 'straight line (first direction)
100 Base 101 Opening portion 102, 102 ', 103, 103' Fitting hole 104 Guided portion 105 Restricted portion 106 U-shaped engaging portion 107, 108 Fitting hole 109 Fixing portion 110, 110 ', 110''Movable Holding member 110a Cylindrical part 111 Flat plate part 112, 113, 114, 115 Fitting hole 116, 116 'Engagement part (support mechanism)
116a long hole 116a ′ notch 116b end surface 117, 117 ″ second engagement portion (regulation guide)
117a long hole 117a '' notch 121 cylinder member (support mechanism)
121a Through hole 121b Both end surfaces 122 First guide shaft (support mechanism)
123 Second guide shaft (regulation guide)
130 1st drive mechanism 131 1st magnet 132 1st coil 133,134 1st yoke 140 2nd drive mechanism 141 2nd magnet 142 2nd coil 143,144 2nd yoke 150 Flexible wiring board 151,152,153,154 Connection Portion 160 Cover member 160a Openings 161, 163 Fitting recesses 162, 164 Fitting hole 170 First detection unit 171 Sensor 172 Magnet 180 Second detection unit 181 Sensor 182 Magnet

Claims (7)

A base having an opening; a movable holding member that holds the lens; a support mechanism that supports the movable holding member in a plane perpendicular to the optical axis of the lens; and the movable holding member that is perpendicular to the optical axis. An image blur correction apparatus comprising: a first drive mechanism that drives in a first direction; and a second drive mechanism that drives the movable holding member in a second direction perpendicular to the optical axis,
The support mechanism includes a first guide shaft that is fixed to the base and extends in a first guide direction perpendicular to the optical axis, and the first guide shaft is slidably inserted and the first guide shaft in the first guide direction. A cylindrical member that moves integrally with the movable holding member and engages the movable holding member so as to allow relative movement of the movable holding member in the first guide direction and the second guide direction perpendicular to the optical axis. And an engaging portion formed on the movable holding member to engage the first guide shaft and allow relative movement of the movable holding member in the second guide direction, and the movable holding member is light Including a regulation guide that regulates and guides tilting with respect to a plane perpendicular to the axis,
An image blur correction apparatus characterized by that. The engaging portion has a long hole or a notch that extends through the first guide shaft and extends in the second guide direction.
The image blur correction apparatus according to claim 1, wherein: The movable holding member includes two engaging portions that engage with both end faces of the cylindrical member.
The image blur correction apparatus according to claim 2, wherein The restriction guide is fixed to the base and extends in parallel with the first guide direction, and the movable guide is engaged with the second guide shaft to restrict movement in the optical axis direction. Including a second engagement portion formed on the holding member;
The image blur correction apparatus according to claim 1, wherein the image blur correction apparatus is an image blur correction apparatus according to claim 1. The base and the movable holding member are formed in a substantially rectangular flat plate shape in which the regions facing each other are substantially flat in the optical axis direction and long in the second guide direction,
The first guide shaft is fixed to one end side of the base in the second guide direction,
The second guide shaft is fixed to the other end side of the base in the second guide direction,
The engaging portion is provided on one end side of the movable holding member in the second guide direction,
The second engagement portion is provided on the other end side of the movable holding member in the second guide direction.
The image blur correction apparatus according to claim 4, wherein: 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.

Images