JP2008090023A - Image blur correcting apparatus and imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image blur correcting apparatus that can be easily assembled, wherein the length of the flexible part of an elastic member can be rigidly defined, then, stable vibration-proof performance can be achieved. <P>SOLUTION: The apparatus includes: a holding member that holds a correction optical system for correcting image blur; the elastic members 217y that elastically and movably support the holding member by the movable ends thereof in a plane perpendicular to the optical axis; a fixing member 221 that fixes the fixed end of the elastic member; and a driving means that drives the holding member in the plane perpendicular to the optical axis. The fixing member includes the same number of injection parts 232 as that of the elastic members, into which damping material is injected; a positioning part 234 for positioning the fixed end of the elastic member; and a fixing/supporting part 235 for defining and fixing the position of the fixed end of the elastic member. The fixed end of the elastic member is inserted into the injection part, the positioning part and the fixing/supporting part in this order, and then, the damping material 233 is injected into the injection part by the amount according to the damping effect, and the length of the flexible part of the elastic member is adjusted. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image blur correction device that corrects image blur on an imaging plane, and an imaging device such as a digital camera and a digital video camera.

  Current cameras, particularly compact cameras, are small and light, and are easy to support with one hand, so photographers often hold the camera with one hand when taking pictures. Therefore, image blur is likely to occur due to camera shake applied to the camera.

  In order to prevent image blur due to camera shake, conventionally, a technology (Patent Document 1) that corrects image blur by decentering the optical axis by driving a lens with a drive unit according to a detection state of camera shake is disclosed. Has been. Furthermore, a technique (Patent Document 2) that corrects image blur by driving the image sensor in a direction orthogonal to the photographing optical axis is disclosed.

In an image blur correction apparatus having a driven portion that is movably supported by an elastic member, as represented by the above-described conventional technology, the driven portion is moved in a plane perpendicular to the optical axis. No complicated slide structure is required. Therefore, there is no unnecessary frictional resistance, and it is possible to follow the image blur correction signal sensitively and smoothly.
Japanese Patent Laid-Open No. 2-66536 Japanese Patent Laid-Open No. 2005-92005

  In the image blur correction apparatus having a driven portion that is supported by the elastic member so as to be movable, the above-mentioned advantages are provided. On the other hand, when vibration occurs during driving because there is no slide structure, until the vibration is settled. It took time to. For this reason, for example, in the image blur correction device disclosed in Patent Document 1, the entire elastic member is covered with rubber as vibration suppression.

  However, in such a structure, since the surface of the elastic member is covered with the rubber member in advance, when the driven portion and the elastic member are fixed, the position where the elastic member is fixed is determined by the length of the rubber portion. The For this reason, the length of the flexible portion of each elastic member cannot be clearly limited, the length of the flexible portion varies, the balance of the force of each elastic member is lost, and it is easy to cause inadvertent vibration of rotation. It was. Also, the assembly was complicated.

(Object of invention)
An object of the present invention is to provide an image blur correction device and an imaging device that are easy to assemble, can precisely define the length of a flexible portion of an elastic member, and can obtain stable vibration isolation performance. It is.

  To achieve the above object, the present invention provides a correction optical system for correcting image blur, a holding member for holding the correction optical system, and the holding member at a movable end in a plane perpendicular to the optical axis. An image blur correction apparatus comprising: at least three elastic members that are elastically supported so as to be movable; a fixing member that fixes a fixed end of the elastic member; and a driving unit that drives the holding member in a plane perpendicular to the optical axis. The number of the fixing members equal to the number of the elastic members, the injection portion into which the damping material is injected, the positioning portion for positioning the fixed end of the elastic member, and the position of the fixed end of the elastic member The fixed end of the elastic member is inserted in the order of the injection portion, the positioning portion, and the fixed support portion, and the amount of vibration suppression is increased in the injection portion. The amount of vibration control By entering, the it is an image was to adjust the length of the flexible portion of the elastic member stabilizer image blur correction device.

  Similarly, in order to achieve the above object, the present invention is an imaging apparatus including the image blur correction apparatus of the present invention.

  According to the present invention, it is possible to provide an image blur correction device or an imaging device that is easy to assemble, can precisely define the length of the flexible portion of the elastic member, and can obtain stable vibration isolation performance. .

  The best mode for carrying out the present invention is as described in Examples 1 to 4 below.

  A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a front view showing a lens barrel 100 of a digital camera provided with a thin optical system typified by a bending optical system. 2 is a perspective view of the image blur correction apparatus 200 provided in the lens barrel 100, FIG. 3 is a top view of the image blur correction apparatus 200, and FIG. 4 is a cross-sectional view taken along line AA in FIG. FIG. 5 is a top view of the fixed frame 221 constituting the image blur correction apparatus 200. 6A and 6B are diagrams for explaining the support portion 230 configured in the fixed frame 221 shown in FIG. 5. FIG. 6A is an enlarged view of a main portion of the support portion 230, and FIG. 6B is an ultraviolet ray irradiation for curing the damper material. FIG. 7 is a cross-sectional view taken along line BB in FIG. 8A and 8B are diagrams for explaining the structure of the support portion 230 capable of adjusting the amount of the damper material. FIG. 8A shows a case where the wire wire is damped and FIG. 8B shows a case where the wire wire is thick. It is a figure explaining damper material amount adjustment in the case of damping.

  As shown in FIG. 4, the image blur correction apparatus 200 according to the first embodiment includes a drive unit 210 supported by four wire wires 217 p and 217 y and a fixing unit 220 fixed to the lens barrel 100. The The support mechanism supported by the four wire wires is a space-saving mechanism that is suitable for realizing the thin lens barrel 100.

  Two driving force generators that can be driven in a plane perpendicular to the optical axis 202 are provided as the driving unit 210. As shown in FIG. 4, the propulsive force generating unit includes coil side yokes 212p and 212y, magnet side yokes 215p and 215y, and coils 213p and 213y and permanent magnets 214p and 214y arranged between the yokes. ing. Magnet side yokes 215p and 215y and permanent magnets 214p and 214y are attached to the lens frame 211. When a current is passed through the coil 213p, the drive unit 210 is driven in the direction of the arrow 210p shown in FIG. 3, and when a current is passed through the coil 213y, the drive unit 210 is driven in the direction of the arrow 210y. The permanent magnets 214p and 214y and the magnet side yokes 215p and 215y are part of the drive unit 210, but are also included in the driven unit.

  In the image blur correction apparatus 200 of the first embodiment, the permanent magnets 214p and 214y are arranged as a moving magnet type attached to the drive unit 210. However, differently from this, the same effect can be obtained also in a moving coil type in which the coils 213p and 213y are attached to the drive unit and driven.

  The two propulsive force generating unit centers 210p-O and 210y-O (see FIG. 3) are arranged in a line with the optical axis 202 (as shown in FIG. 3, in a line on the Yaw axis). Arrangement), a thin arrangement was realized in the pitching direction (arrow 210p in FIG. 3). In addition, the optical axis 202 (center of gravity position) is not positioned in the direction of the arrow 210p when propelling in the direction of the arrow 210p. Therefore, it is necessary to prevent the movement in the rotation direction (arrow 210r in FIG. 3) from occurring simultaneously with the propulsion in the direction indicated by the arrow 210p. Therefore, the overall spring center of the wire wires 217p and 217y is arranged so as to substantially coincide with the propulsive force generating portion center 210p-O in the direction of the arrow 210p. That is, the wire springs 217p and 217y have different spring constants, so that the total spring center is shifted from the optical axis 202. Here, the spring constants are made different by making the wire diameters of the wire wires 217p and 217y different. In the image blur correction apparatus 200 according to the first embodiment, a stainless steel wire wire Φ0.26 is used as the wire wire material 217p, and a stainless steel wire wire material Φ0.16 is used as the wire wire material 217y.

  The movement direction in which the above-mentioned general spring center is made to coincide with the propulsive force generating portion center 210p-O is on the Yaw axis as shown in FIG. 3, and coincides with the propulsive direction 210y of the other propulsive force generating portion. Therefore, the movement of the total spring center does not affect the driving in the 210y direction.

  By realizing the arrangement of the above-described components and the respective components, it is possible to follow the correction signal sensitively and smoothly without having a complicated slide structure for moving the driving unit 210 in a plane perpendicular to the optical axis 202. The image blur correction apparatus 200 capable of performing the above is possible. However, in an apparatus having a driven part (including a part of the driving part) supported only by such an elastic member, a slide structure for moving the driven part in a plane perpendicular to the optical axis 202 is used. There is no friction. For this reason, as described above, when vibration occurs during driving, there is a problem that it takes time until the vibration is settled.

  Therefore, in the first embodiment, the following configuration is provided in order to realize an image blur correction device 200 that is easy to assemble and can obtain a stable image stabilization performance.

  The details of the fixing and assembling of the image blur correction apparatus according to the first embodiment and the vibration damping structure will be described below.

  FIG. 5 shows a fixing portion 220 (see FIG. 4) for fixing the wire wires 217p and 217y that support the driven portion (the lens frame 211, the correction optical system 201, the permanent magnets 214p and 214y, and the magnet side yokes 215p and 215y). It is the top view which looked at the fixed frame 221 which comprises from the optical axis direction. The driven portion includes a lens frame 211, a correction optical system 201, permanent magnets 214p and 21y, and magnet side yokes 215p and 215.

  As shown in FIG. 5, the fixed frame 221 includes the same number of support portions 230 as the four wire wires 217p and 217y. The fixed frame 221 is made of a member that does not transmit photographing light. In the first embodiment, polycarbonate containing carbon black is used. Further, the image blur correction apparatus 200 according to the first embodiment has a structure in which an ultraviolet curable gel material is used as the damper material.

  As shown in FIG. 7, the four support portions 230 are provided in order from the top in the drawing, an injection portion 232 for injecting a damper material 233 as will be described later, and a positioning portion 234 in which the wire wire 217 y is inserted and supported. And a fixed support portion 235 for fixing the wire wire 217y. The wire wire 217y is inserted from the injection part 232 side through the positioning part 234 to the fixed support part 235. Since the positioning portion 234 is chamfered on the injection portion 232 side, it is easy to incorporate when inserting the wire 217y. The hole into which the wire wire 217y of the positioning part 234 is inserted is a hole having a diameter that has a clearance of several tens to several hundreds of μm from the wire wire 217y. However, the wire 217y is positioned so as to be defined at a predetermined position by a fixing jig (not shown) and does not contact the positioning portion 234. In this state, the adhesive 236 is injected into the fixed support portion 236, and the wire wire 217y is fixed at a predetermined position.

  As shown in FIG. 6, the injection portion 232 is provided with a slit 231 parallel to the optical axis disposed far from the photographing optical path, and a surface 237 opposite to the slit 231 of the injection portion 232 is finished to be a mirror surface. Yes. The slit 231 is used to vent air when the damper material 233 is injected and to irradiate ultraviolet rays when the damper material 233 is cured in a gel form. Further, since the slit 231 is disposed on the surface of the injection unit 232 far from the photographing optical path, harmful light does not enter the photographing optical path from the slit 231 during photographing.

  As shown in FIG. 6, the injection part 232 is formed of rectangular holes having different lengths in the pitching direction (Pitch direction) and the yawing direction (Yaw direction). In this way, when the damper material 233 is injected, a space is formed in the longitudinal direction of the injection portion 232 (here, the Pitch direction), and there is no failure such as contact with the wire wire 217y. The damper material 233 can be injected.

  After the damper material 233 is injected into the injection portion 232, ultraviolet irradiation is performed from the slit 231 side. At this time, in order to uniformly cure the damper material 233, the ultraviolet irradiation light 238 irradiated to the injection portion 232 through the slit 231 is reflected by the mirror surface 237 as shown in FIG. Then, ultraviolet irradiation is performed at an angle so that the entire damper material 233 injected into the injection portion 232 is irradiated.

  In the first embodiment, the ultraviolet curable gel is used for the damper material 233, but it goes without saying that the damper material may be made of rubber, silicon or the like.

  The injection part 232 of the first embodiment regulates the amount of the damper material 233 by injecting the damper material 233 until it is full. However, if it is desired to control the amount of vibration suppression for each wire and wire, it is easy to define the amount of injection of the damper material for each step as shown in FIG. Is possible.

  FIG. 8A illustrates a case where the wire wire inserted into the fixed frame 221 has a small diameter, and FIG. 8B illustrates a case where the wire wire has a large diameter. As shown in FIG. 8A, when the wire wire has a small diameter, vibration suppression is not required as in the case of the large diameter as shown in FIG. In such a case, for example, the damper material injection amount up to the second step may be set using the step shape as a guide. Since the step can be used as a scale, it can be visually confirmed from the slit 231 side, and the injection amount can be easily determined.

  In the first embodiment described above, the injection support part 235 for the wire wires 217p and 217y and the injection part 232 for injecting the damper material 233 as the damping material are provided with the positioning part 234 interposed therebetween. The lengths of the flexible portions of the wire wires 217p and 217y can be strictly defined only by the shape formed on the fixed frame 221. Therefore, assembly is easy, the length of the flexible part of the wire wires 217p and 217y can be strictly defined, and stable vibration isolation performance can be obtained. In other words, it is possible to provide the image blur correction apparatus 200 that can perform highly accurate correction without increasing the number of parts.

  In addition, a built-in structure of a damping member that attenuates the vibration of the drive unit 210 without transmitting harmful light other than the photographing light beam before the fixed unit 220 is employed. Therefore, it is possible to provide the image blur correction apparatus 200 that enables good shooting without being affected by harmful light.

  An image blur correction apparatus 200 according to the second embodiment of the present invention will be described with reference to FIGS. FIG. 9 is a perspective view showing an image blur correction apparatus 200 according to Embodiment 2 of the present invention. 10A and 10B are diagrams for explaining the fixed frame 221 constituting the image blur correction apparatus 200 of FIG. 9, wherein FIG. 10A is a top view of the fixed frame 221, and FIG. 10B is a view of the support portion 230 configured in the fixed frame 221. It is a principal part enlarged view. FIG. 11 is a cross-sectional view taken along the line CC of FIG.

  The second embodiment of the present invention uses the same components as the first embodiment. In the first embodiment, a mirror surface 237 is formed on the injection portion 232 so that the damper material 233 is cured. On the other hand, in the second embodiment of the present invention, a metal plate 937 is disposed in the injection portion 232 to reflect the ultraviolet irradiation light.

  As shown in FIGS. 10 to 11, the metal plate 937 is fixed to the fixed frame 221 so as to be inserted into a surface facing the slit 231. The built-in structure of the damper material 233, the built-in fixing method of the wire wires 217p and 217y, and other effects are substantially the same as in the first embodiment, and the description thereof is omitted.

  An image blur correction apparatus 200 according to the third embodiment of the present invention will be described with reference to FIGS. FIG. 12 is a perspective view showing an image blur correction apparatus 200 according to Embodiment 3 of the present invention. 13A and 13B are diagrams for explaining the fixed frame 221 constituting the image blur correction apparatus 200 of FIG. 12, where FIG. 13A is a top view of the fixed frame 221, and FIG. 13B is a view of the support unit 230 configured on the fixed frame 221. It is a principal part enlarged view. FIG. 14 is a sectional view taken along the line DD of FIG.

  The third embodiment of the present invention uses the same components as those of the first embodiment. In the first embodiment, a mirror surface 237 is formed on the injection portion 232 so that the damper material 233 is cured. On the other hand, in Example 3 of the present invention, an R convex mirror surface 1237 is formed in the injection portion 232 to reflect the ultraviolet irradiation light.

  With the above configuration, it is not necessary to irradiate ultraviolet irradiation light with various angles through the slit 231. Therefore, as shown in FIG. 13B, the irradiation light is scattered by the R convex surface 1237 only by irradiating the ultraviolet irradiation light 238 perpendicular to the slit 231, and the entire damper material 233 can be cured. . The built-in structure of the damper material 233, the built-in fixing method of the wire wires 217p and 217y, and other effects are substantially the same as in the first embodiment, and the description thereof is omitted.

  An image blur correction apparatus according to Embodiment 4 of the present invention will be described with reference to FIGS. FIG. 15 is a perspective view showing an image blur correction apparatus 200 according to Embodiment 4 of the present invention. 16A and 16B are diagrams for explaining the fixed frame 221 constituting the image blur correction apparatus 200 of FIG. 15, wherein FIG. 16A is a top view of the fixed frame 221, and FIG. It is a principal part enlarged view. 17 is a cross-sectional view taken along the line E-E in FIG. 16B, and FIG.

  The fourth embodiment of the present invention uses the same components as those of the first embodiment. In the first embodiment, the slit 231 is formed in the injection portion 232 to cure the damper material 233. On the other hand, in Example 4 of the present invention, one surface of the wall surface constituting the injection portion 232 is made into an entire opening shape, a transparent plate 1537 is attached to the opening shape side, and the ultraviolet irradiation light 238 is passed through the transparent plate 1537. Is applied to the damper material 233.

  With the above configuration, there is no need to configure a reflecting surface such as the mirror surface 237 configured in the injection portion 232 in the first embodiment, and the entire damper material 233 has ultraviolet rays as shown in FIG. Irradiation of the irradiation light 238 can be easily performed.

  Moreover, as shown in FIG. 18, since the whole injection | pouring part 232 can be visually observed from the transparent plate 1537 side, the injection | pouring defect of the damper material 233, the hardening defect, etc. came to be able to be confirmed easily now. Further, similarly to the slit 231 of the first embodiment, since the opening shape of the injection portion 232 is arranged on the surface far from the photographing optical path, harmful light is not inserted into the photographing optical path from the opening shape side during photographing. . The method for assembling and fixing the wire wires 217p and 217y and other effects are substantially the same as those in the first embodiment, and the description thereof is omitted.

  According to the first to fourth embodiments, the lengths of the flexible portions of the wire wires 217p and 217y, which are elastic members, are strictly defined, and harmful light other than the imaging light is transmitted before the fixed portion 220. The structure which incorporates the damping member which attenuates the vibration of a drive part without comprising is comprised. As a result, it is possible to provide an image blur correction device 200 that can perform high-precision correction and can perform good photographing without being affected by harmful light.

  In Examples 1 to 4 described above, an example is shown in which four wire wires that are elastic members are provided. In this case, the fixed frame 221 is not rectangular, for example, has a round shape, and, for example, three wire wires and three support portions 230 (injection portion 232, positioning portion 234, fixed portion) are fixed to the edge of the round fixed frame. A support 235) will be provided.

It is a front view which shows the lens-barrel of the digital camera which comprises the image blurring correction apparatus concerning Example 1 of this invention. It is a perspective view which shows the image blurring correction apparatus of FIG. It is a top view which shows the image blurring correction apparatus of FIG. It is AA sectional drawing of FIG. It is a top view of the fixed frame which comprises the image blurring correction apparatus of FIG. It is a figure for demonstrating the support part comprised by the fixed frame shown in FIG. It is BB sectional drawing of FIG. It is a figure explaining the structure of the support part which prescribes | regulates the quantity of a damper material in the image blurring correction apparatus of FIG. It is a perspective view which shows the image blurring correction apparatus concerning Example 2 of this invention. It is a figure for demonstrating the fixed frame which comprises the image blurring correction apparatus of FIG. It is CC sectional drawing of FIG.10 (b). It is a perspective view which shows the image blurring correction apparatus concerning Example 3 of this invention. It is a figure for demonstrating the fixed frame which comprises the image blurring correction apparatus of FIG. It is DD sectional drawing of FIG.13 (b). It is a perspective view which shows the image blurring correction apparatus concerning Example 4 of this invention. It is a figure for demonstrating the fixed frame which comprises the image blurring correction apparatus of FIG. It is EE sectional drawing of FIG.16 (b). FIG. 16 is a right side view illustrating the image blur correction device of FIG. 15.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Lens barrel 200 Image blur correction apparatus 201 Correction optical system 202 Optical axis 210 Drive part (drive means)
210p-O, 210y-O center of the propulsive force generator 211 lens frame (holding member)
212p, 212y, 215p, 215y Yoke 213p, 213y Coil 214p, 214y Permanent magnet 217p, 217y Wire wire (elastic member)
220 fixing part 221 fixing frame (fixing member)
230 Support part 231 Slit 232 Injection part 233 Damper material (damping material)
234 Positioning portion 235 Fixed support portion 236 Adhesive 237 Mirror surface 238 Ultraviolet irradiation light 937 Metal plate 1237 R convex surface 1537 Transparent plate

Claims (4)

A correction optical system for correcting image blur;
A holding member for holding the correction optical system;
At least three elastic members that elastically support the holding member movably at a movable end in a plane perpendicular to the optical axis;
A fixing member for fixing a fixed end of the elastic member;
An image blur correction apparatus having driving means for driving the holding member in a plane perpendicular to the optical axis,
The fixed member defines the same number of injection parts as the number of the elastic members into which the damping material is injected, a positioning part for positioning the fixed end of the elastic member, and the position of the fixed end of the elastic member. And having a fixing support part for fixing,
A fixed end of the elastic member is inserted in the order of the injection portion, the positioning portion, and the fixing support portion, and a damping material is injected into the injection portion by an amount corresponding to the amount of vibration suppression, and the elastic member An image blur correction apparatus characterized in that the length of the flexible portion of the lens is adjusted.   The image blur correction apparatus according to claim 1, wherein the fixing member is formed of a member that does not transmit harmful light. The vibration damping material is a material that is cured by ultraviolet rays,
The said injection | pouring part is provided with the slit or the permeation | transmission part so that an ultraviolet-ray may be permeate | transmitted on the opposite side to the said optical axis with respect to the said elastic member inserted. Image blur correction device.   An image pickup apparatus comprising the image blur correction apparatus according to claim 1.

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