JP6046427B2 - Optical unit - Google Patents

Description

  The present invention relates to an optical unit mounted on a camera-equipped mobile phone or the like.

  An imaging device such as a digital camera or a camera-equipped mobile phone is configured as an optical unit with a shake correction function having a shake correction function in order to suppress disturbance of a captured image caused by a shake such as a user's hand shake. In such an optical unit, a movable body in which a substrate for holding an image sensor is disposed to be overlapped on the front side in the optical axis direction of the rear plate portion, and a bottom plate portion that faces the rear plate portion of the movable body in the rear direction in the optical axis direction in the fixed body A swing fulcrum is formed between the two. For this reason, when the optical unit is shaken due to the influence of camera shake or the like, the drive mechanism swings the movable body around the swing fulcrum and corrects the shake (see, for example, Patent Document 1).

  Here, both the image sensor and the swing fulcrum are arranged on the optical axis. Further, the swing fulcrum has a structure in which a convex portion formed on the bottom plate portion of the fixed body is configured on the rear plate portion of the movable body.

JP 2009-288769 A

  However, in the optical unit described in Patent Document 1, when the movable body is displaced rearward in the optical axis direction due to an external impact, stress is concentrated on the portion where the swing fulcrum is in contact with the rear plate portion. Therefore, a large force is applied to the substrate. Accordingly, an excessive force is applied to the connection portion such as the wire bonding between the image pickup device or the image pickup device and the substrate, and there is a problem that the impact resistance performance of the optical unit is low.

  In view of the above problems, an object of the present invention is to provide an optical unit capable of improving impact resistance.

In order to solve the above-described problems, the present invention provides an imaging element, a substrate that holds the imaging element, a movable body that includes a rear plate portion that overlaps the rear side in the optical axis direction of the substrate, A fixed body having a bottom plate portion opposed on the rear side in the axial direction, a swing fulcrum configured at a position overlapping the image sensor in the optical axis direction between the rear plate portion and the bottom plate portion, and the swing An optical unit having a driving mechanism that swings the movable body with respect to the fixed body around a fulcrum, the swing fulcrum is elastically deformable in the optical axis direction, and the rear plate portion is An end plate portion, and a convex bottom portion protruding from the end plate portion toward the bottom plate portion at a position overlapping with the swing fulcrum in the optical axis direction, the convex bottom portion being the swing fulcrum. A first bottom portion overlapping the front side in the optical axis direction, and facing the bottom plate portion on the rear side in the optical axis direction from the first bottom portion And a second bottom that, the rocking fulcrum is provided with a resilient member, wherein the rocking fulcrum is either the elastic member protrudes to abut on the first bottom from the side of the bottom plate, or the The elastic member is configured to receive the convex portion protruding from the first bottom portion toward the bottom plate portion on the side of the bottom plate portion, and the elastic member is made of rubber, and is formed on the first bottom portion in the bottom plate portion. A rubber plate-like portion thicker than a dimension in which the second bottom portion protrudes rearward in the optical axis direction when viewed from the first bottom portion is provided at a position facing the rear side in the optical axis direction. To do.

  In the present invention, when the movable body is displaced rearward in the optical axis direction due to an impact from the outside, the swing fulcrum can be elastically deformed in the optical axis direction, so that the impact can be absorbed. In addition, a convex bottom portion is provided at a position overlapping the imaging device in the rear plate portion, and the first bottom portion of the convex bottom portion overlaps the swing fulcrum. For this reason, since there is a gap between the first bottom portion of the convex bottom portion and the substrate, the force when the movable body is displaced rearward in the optical axis direction is not directly transmitted from the rear plate portion to the substrate. . Further, since the force when the movable body is displaced rearward in the optical axis direction is dispersed throughout the convex bottom portion, it is difficult to cause a situation where a large force is concentrated and transmitted to a specific portion of the substrate. Furthermore, since the convex bottom portion includes a second bottom portion facing the bottom plate portion on the rear side in the optical axis direction from the first bottom portion, even when the movable body is largely displaced rearward in the optical axis direction, the second bottom portion is Abuts on the bottom plate and functions as a stopper. Therefore, the swing fulcrum does not deform excessively.

In the present invention, the elastic member constituting the swing fulcrum is made of rubber, and the bottom plate portion is located at a position facing the first bottom portion on the rear side in the optical axis direction when viewed from the first bottom portion. A rubber plate-like portion thicker than the dimension in which the second bottom portion projects rearward in the optical axis direction is provided. Therefore, when the movable body is greatly displaced rearward in the optical axis direction, first, the first bottom portion comes into contact with the rubber plate-like portion, so that the impact can be absorbed.

In the present invention, it is preferable that the second bottom portion and the end plate portion are connected by a tapered surface. According to such a configuration, when the force when the movable body is displaced rearward in the optical axis direction is transmitted from the convex bottom portion to the end plate portion, the force is further dispersed and transmitted. For this reason, it is difficult for a situation where a large force is concentrated and transmitted to a specific portion of the substrate.

In the present invention, the swing fulcrum is constituted by, for example, an elastic member that protrudes from the side of the bottom plate portion so as to contact the first bottom portion.

In the present invention, the swing fulcrum adopts a configuration including a convex portion protruding from the first bottom portion toward the bottom plate portion, and an elastic member that receives the convex portion on the side of the bottom plate portion. May be.

  In the present invention, it is preferable that the convex bottom portion has an outer peripheral shape including an arc portion centering on the swing fulcrum at two places on both sides sandwiching the swing fulcrum. According to such a configuration, when the force when the movable body is displaced rearward in the optical axis direction is transmitted from the convex bottom portion to the end plate portion, the force is further dispersed and transmitted. For this reason, it is difficult for a situation where a large force is concentrated and transmitted to a specific portion of the substrate.

  In this case, the convex bottom portion has an outer peripheral shape in which an end portion of one arc portion of the arc portions formed at two locations on both sides and an end portion of the other arc portion are connected by a linear portion. It is preferable. According to such a configuration, the region where the straight line portion is provided can be used as a portion through which a wiring material such as a flexible wiring board is passed.

  In the present invention, the convex bottom may have a circular outer peripheral shape centering on the swing fulcrum.

  In this invention, it is preferable that the diameter of the circular arc formed in the outer periphery of the said convex bottom part is larger than the dimension of the side when the said image pick-up element is seen from an optical axis direction. According to such a configuration, it is difficult for the force when the movable body is displaced to the rear side in the optical axis direction to be concentrated and transmitted to a specific portion of the image sensor.

  In the present invention, the drive mechanism is preferably a shake correction drive mechanism that swings the movable body around the swing fulcrum so as to correct the shake of the fixed body. According to this configuration, it is possible to correct shake such as camera shake of the optical unit.

In the present invention, when the movable body is displaced rearward in the optical axis direction due to an impact from the outside, the swing fulcrum can be elastically deformed in the optical axis direction, so that the impact can be absorbed. In addition, a convex bottom portion is provided at a position overlapping the imaging device in the rear plate portion, and the first bottom portion of the convex bottom portion overlaps the swing fulcrum. For this reason, since there is a gap between the first bottom portion of the convex bottom portion and the substrate, the force when the movable body is displaced rearward in the optical axis direction is not directly transmitted from the rear plate portion to the substrate. . Further, since the force when the movable body is displaced rearward in the optical axis direction is dispersed throughout the convex bottom portion, it is difficult to cause a situation where a large force is concentrated and transmitted to a specific portion of the substrate. Furthermore, since the convex bottom portion includes a second bottom portion facing the bottom plate portion on the rear side in the optical axis direction from the first bottom portion, even when the movable body is largely displaced rearward in the optical axis direction, the second bottom portion is Abuts on the bottom plate and functions as a stopper. Therefore, the swing fulcrum does not deform excessively. In addition, when the movable body is greatly displaced to the rear side in the optical axis direction, first, the rubber plate-like portion thicker than the dimension in which the second bottom portion projects rearward in the optical axis direction when viewed from the first bottom portion is the second bottom portion. Because it abuts against the shock, the impact can be absorbed.

It is explanatory drawing which shows typically a mode that the optical unit with a shake correction function which concerns on Embodiment 1 of this invention was mounted in optical apparatuses, such as a mobile telephone. It is a perspective view which shows the external appearance etc. of the optical unit with a shake correction function which concerns on Embodiment 1 of this invention. It is a disassembled perspective view when the fixed body and movable body of the optical unit which concern on Embodiment 1 of this invention are decomposed | disassembled. It is a disassembled perspective view when the stationary body and movable body of the optical unit which concern on Embodiment 1 of this invention are further decomposed | disassembled. It is explanatory drawing which shows the structure of the optical axis direction back side of the optical unit with a shake correction function which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the cross-sectional structure of the rocking | fluctuation fulcrum comprised in the optical unit with a shake correction function which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the structure of the reinforcement board which comprises the rear-plate part of a movable body in the optical unit with a shake correction function which concerns on Embodiment 1 of this invention. It is sectional drawing of the optical unit which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the cross-sectional structure of the rocking | fluctuation fulcrum comprised in the optical unit with a shake correction function which concerns on Embodiment 2 of this invention.

  The best mode for carrying out the present invention will be described below with reference to the drawings. In the following description, a configuration for preventing camera shake of the imaging unit as an optical unit will be exemplified. In the following description, three directions orthogonal to each other are defined as an X axis, a Y axis, and a Z axis, respectively, and a direction along the optical axis L (lens optical axis) is defined as a Z axis. In the Z-axis direction (optical axis direction), the subject side is referred to as “front side”, and the opposite side to the subject side is referred to as “rear side”. Further, in the following description, among the shakes in each direction, rotation around the X axis corresponds to so-called pitching (pitch), rotation around the Y axis corresponds to so-called yawing (roll), and Z axis The rotation around corresponds to so-called rolling. Also, + X is attached to one side of the X axis, -X is attached to the other side, + Y is attached to one side of the Y axis, -Y is attached to the other side, and one side of the Z axis is attached. In the following description, + Z is attached to the side (opposite the subject side / back in the optical axis direction), and −Z is attached to the other side (subject side / front in the optical axis direction).

[Embodiment 1]
(Overall configuration of optical unit)
FIG. 1 is an explanatory view schematically showing a state in which an optical unit with a shake correction function according to Embodiment 1 of the present invention is mounted on an optical device such as a mobile phone.

  An optical unit 100 (an optical unit with a shake correction function) illustrated in FIG. 1 is a thin camera used for an optical device 1000 such as a mobile phone with a camera, and is supported by a chassis 1100 (device main body) of the optical device 1000. It is mounted with. In such an optical unit 100, when a shake such as a hand shake occurs in the optical apparatus 1000 during shooting, the captured image is disturbed. Therefore, in the optical unit 100 of the present embodiment, the movable body 3 including the imaging unit 1 is supported in a swingable manner within the fixed body 200, as will be described later, and the movable body 3, the fixed body 200, Alternatively, on the basis of the result of detecting hand shake by a shake detection sensor 170 (shake detection means) such as a gyroscope provided outside the fixed body 200, a shake correction drive mechanism for correcting the shake by swinging the movable body 3 (see FIG. (Not shown in FIG. 1).

  In the optical unit 100, a flexible wiring board 420 for supplying power to the shake correction drive mechanism is drawn out, and the flexible wiring board 420 is electrically connected to a drive control unit 900 provided outside the fixed body 200. It is connected to the.

(Overall configuration of movable body 3)
FIG. 2 is a perspective view showing an appearance and the like of the optical unit with a shake correction function according to the first embodiment of the present invention. FIGS. 2A and 2B show the optical unit on the subject side (in the optical axis direction). FIG. 4 is a perspective view when viewed from the front side and an exploded perspective view when the optical unit is viewed from the subject side. FIG. 3 is an exploded perspective view when the fixed body and the movable body of the optical unit according to Embodiment 1 of the present invention are disassembled. FIG. 4 is an exploded perspective view of the optical unit according to Embodiment 1 of the present invention, in which the fixed body and the movable body are further disassembled. FIGS. 5A and 5B are explanatory diagrams showing the configuration of the rear side in the optical axis direction of the optical unit with a shake correction function according to the first embodiment of the present invention. FIGS. FIG. 4 is an exploded perspective view when viewed from the rear side in the axial direction, and an exploded perspective view when the optical unit is further disassembled and viewed from the rear side in the optical axis direction.

  2, 3, 4, and 5, the movable body 3 is provided in a rectangular box-shaped rectangular case 14 made of a ferromagnetic plate such as a steel plate, and on the rear side in the optical axis direction with respect to the rectangular case 14. The reinforcing plate 19 constitutes a rear plate portion (rear surface portion 39) on the rear side of the movable body 3 in the optical axis direction. The rectangular case 14 constitutes the outer peripheral portion of the imaging unit 1 and functions as a yoke. In the movable body 3, the flexible wiring board 410 is pulled out from the rectangular case 14.

  Inside the rectangular case 14, an imaging unit 1 having a lens 1a (see FIG. 1 / optical element) is held. In this embodiment, the imaging unit 1 includes a lens holder that holds the lens 1a, a cylindrical sleeve that holds the lens holder, a lens driving mechanism that drives the lens holder in the focusing direction, an imaging element 1b, An element holder 1c for supporting the image pickup element 1b is provided, and the element holder 1c protrudes laterally from the rear end portion in the optical axis direction of the rectangular case 14. The imaging element 1b is mounted at the center of a rectangular rigid substrate 413 attached to the end 411 of the flexible wiring board 410, and the flexible wiring board 410 has a function of outputting a signal from the imaging unit 1. . In addition, the flexible wiring board 410 is electrically connected to a lens driving mechanism configured inside the rectangular case 14.

  The square case 14 includes a front plate portion 141 that constitutes the front surface portion 31 of the movable body 3, and a square cylindrical body portion 142. A plate-shaped permanent magnet 520 is bonded to the outer surface of the rectangular cylindrical body portion 142. It is fixed with agents. In addition, an opening 141 a is formed in a portion where the optical axis L passes in the front plate portion 141. In this embodiment, the front end portion in the optical axis direction of the imaging unit 1 protrudes from the opening 141a to the front side in the optical axis direction.

  In this embodiment, the front surface portion 31 of the movable body 3 (the front plate portion 141 of the square case 14) has the corners 3a, 3b, 3c, and 3d (the corners of the front plate portion 141) of the front surface portion 31 of the movable body 3. A recess 3f is formed which is recessed on the rear side in the optical axis direction. In this embodiment, the concave portion 3f is formed of a step having a bottom portion 3g parallel to the front surface portion 31, and the bottom portion 3g of the concave portion 3f is located on the rear side in the optical axis direction with respect to the portion located on the most front side in the optical axis direction in the movable body 3. To position.

  The rear surface portion 39 of the movable body 3 is constituted by a reinforcing plate 19 provided on the rear side of the rectangular case 14 in the optical axis direction. The reinforcing plate 19 is a press-processed product with respect to a metal plate, and includes a substantially rectangular end plate portion 191 and four connecting plate portions 192 standing from the outer peripheral edge of the end plate portion 191 toward the front side in the optical axis direction. Yes. In this embodiment, the reinforcing plate 19 is connected to the rear end portion (element holder 1c) of the imaging unit 1 via the connecting plate portion 192. There is a gap between the end plate portion 191 of the reinforcing plate 19 and the rear end portion (element holder 1 c) of the imaging unit 1, and the rigidity stuck to the end portion 411 of the flexible wiring board 410 is provided in the gap. A substrate 413 is inserted. Note that the end portion 411 itself may be a rigid substrate instead of the structure to which the rigid substrate 413 is attached.

  As shown in FIG. 5, the end portion 411 of the flexible wiring board 410 includes a portion where the flexible wiring board 410 is bent to the one side + Y at the other side −Y in the Y-axis direction. On the other hand, a portion 412 that overlaps in the Z-axis direction with the reinforcing plate 19 interposed therebetween is formed into a narrow strip-shaped portion 412b that sandwiches a portion through which the optical axis L passes on both sides in the X-axis direction by a notch 412a extending in the Y-axis direction. It has become. For this reason, the central portion of the reinforcing plate 19 is exposed toward the rear side in the optical axis direction by the notch 412a extending in the Y-axis direction in the flexible wiring board 410, and using the exposed portion, A rocking fulcrum 180 described later comes into contact with the rear surface 39 (reinforcing plate 19) of the movable body 3.

(Configuration of fixed body 200)
2, 3, 4, and 5 again, the optical unit 100 includes a spring member 600 in which the movable body 3 is supported by the fixed body 200 so as to be displaceable, and the movable body 3 and the fixed body 200. And a shake correction drive mechanism 500 that generates a magnetic drive force that relatively displaces the movable body 3 with respect to the fixed body 200.

  The fixed body 200 includes an upper cover 250, a lower cover 700, and the like. The upper cover 250 includes a rectangular tubular body 210 that surrounds the movable body 3, and a front plate portion that closes the front side of the rectangular tubular body 210. 220. In the upper cover 250, the end of the rectangular tube-shaped body 210 opposite to the subject side (the side on which the optical axis L extends) (the rear side in the optical axis direction) is an open end. The plate portion 220 is formed with an opening 220a through which light from a subject enters. In this embodiment, the opening 220a has a shape in which rectangular holes 220c are connected to both sides in the X-axis direction and both sides in the Y-axis direction with respect to the circular hole 220b centering on the position through which the optical axis L passes. ing.

(Configuration of rocking fulcrum 180)
6A and 6B are explanatory views showing a cross-sectional configuration of a swing fulcrum configured in the optical unit with a shake correction function according to Embodiment 1 of the present invention. FIGS. 6A and 6B are views of the optical unit. It is the YZ sectional view around the rocking fulcrum, and the XZ sectional view. FIG. 7 is an explanatory diagram showing the configuration of the reinforcing plate that constitutes the rear plate portion of the movable body in the optical unit with a shake correction function according to the first embodiment of the present invention, and FIGS. These are a perspective view when the reinforcing plate is viewed from the rear side in the optical axis direction, and a bottom view of the reinforcing plate. In FIG. 6, the rigid substrate 413 is illustrated, but the flexible wiring substrate 410 is not illustrated.

  4 and 5 and the like, the lower cover 700 is a press-processed product for a metal plate, and includes a substantially rectangular bottom plate portion 710 and three side plate portions 720 standing from the outer peripheral edge of the bottom plate portion 710 toward the subject. It has. A swing fulcrum 180 is formed between the bottom plate portion 710 of the lower cover 700 and the reinforcing plate 19 constituting the rear surface portion 39 of the movable body 3. In this embodiment, a swing fulcrum 180 is provided at a position where the optical axis L passes.

  For this reason, as shown in FIG. 6, both the swing fulcrum 180 and the image sensor 1b are located on the optical axis L. In this embodiment, the swing fulcrum 180 is formed of an elastic member 182 for the swing fulcrum fixed to a hole 710 a formed in the bottom plate portion 710 of the lower cover 700. The elastic member 182 includes a circular plate-shaped portion 183 that overlaps the bottom plate portion 710, and a hemispherical convex portion 184 for the swing fulcrum that protrudes forward from the plate-shaped portion 183 in the optical axis direction. 180 (semispherical convex portion 184) abuts against the reinforcing plate 19 of the movable body 3. In this embodiment, the elastic member 182 is made of rubber or the like. For this reason, the swing fulcrum 180 can be elastically deformed in the optical axis direction.

  As shown in FIGS. 6 and 7, the reinforcing plate 19 includes an end plate portion 191, and a convex bottom portion 193 protruding from the end plate portion 191 toward the rear side in the optical axis direction (side on which the bottom plate portion 710 is located) The convex bottom portion 193 overlaps the imaging element 1b and the swing fulcrum 180 in the optical axis L direction. The convex bottom 193 is exposed from the notch 412a formed in the flexible wiring board 410 toward the rear side in the Z-axis direction (see FIG. 5).

  Here, the convex bottom portion 193 includes a planar first bottom portion 194 that overlaps the swing fulcrum 180 on the front side in the optical axis direction and abuts the swing fulcrum 180, and a bottom plate portion on the rear side in the optical axis direction from the first bottom portion 194. And a second bottom portion 195 having a planar shape facing 710. The second bottom portion 195 is bent from the end of the first bottom portion 194 in a stepped manner and is directed from the portion facing the rear side in the optical axis direction. Become. In this embodiment, the convex bottom 193 has an oval shape extending in the Y-axis direction. More specifically, the convex bottom portion 193 has an outer peripheral shape including arc portions 193e and 193f centered on the swing fulcrum 180 at two positions on both sides sandwiching the swing fulcrum 180 therebetween in the Y-axis direction. 5, the end of one arcuate portion 193e and the end of the other arcuate portion 193f are connected by linear portions 193g and 193h extending linearly in the Y direction so as to correspond to the notch 412a shown in FIG. ing. The rectangular area located at the central portion of the convex bottom portion 193 is a first bottom portion 194 with which the swing fulcrum 180 abuts, and the portion sandwiching the first bottom portion 194 on both sides in the Y-axis direction is the second bottom portion. It is 195. In the present embodiment, on the side where the arc portions 193e and 193f are located, the second bottom portion 195 and the end plate portion 191 are connected via the tapered surfaces 193a and 193b, and the first bottom portion 194 and the second bottom portion 195 are tapered. It is connected via the surface 194a.

  Here, the convex bottom portion 193 overlaps the imaging element 1b in the optical axis L direction, and the diameters of the arc portions 193e and 193f (longitudinal dimension of the convex bottom portion 193 / Y-axis direction of the convex bottom portion 193). Is longer than the length of one side of the image sensor 1b. For this reason, the convex bottom portion 193 has both end portions where the arc portions 193e and 193f are located project outward from the image sensor 1b.

  Further, the plate-like portion 183 of the elastic member 182 faces the first bottom portion 194 of the convex bottom portion 193 on the rear side in the optical axis direction (the side of the bottom plate portion 710). Here, the thickness dimension d of the plate-like part 183 is larger than the dimension h of the second bottom part 195 projecting rearward in the optical axis direction when viewed from the first bottom part 194. A reinforcing groove 196 extending in the X-axis direction is formed in the vicinity of the other end portion in the Y-axis direction of the end plate portion 191.

(Configuration of permanent magnet assembly 75)
As shown in FIGS. 2, 3, and 4, in the optical unit 100 of this embodiment, the movable body 3 includes a rectangular frame-shaped holder 7 that surrounds the outer peripheral surface of the rectangular case 14 of the imaging unit 1, and a rectangular frame-shaped holder. A stopper member 8 is provided, and the stopper member 8 is fixed to the rear surface of the holder 7 in the optical axis direction by a method such as welding. The holder 7 includes a rectangular frame-shaped first holder member 71 located on the front side in the optical axis direction and a rectangular frame-shaped second holder member 72 facing the first holder member 71 on the rear side in the optical axis direction. In the present embodiment, a flat permanent magnet 520 used for the shake correction drive mechanism 500 is held between the first holder member 71 and the second holder member 72. More specifically, the first holder member 71 is fixed to the front surface of the permanent magnet 520 in the optical axis direction, and the second holder member 72 is fixed to the rear surface of the permanent magnet 520 in the optical axis direction. The permanent magnet 520, the first holder member 71, and the second holder member 72 constitute a rectangular tubular permanent magnet assembly 75. For this reason, after the imaging unit 1 is inserted inside the rectangular cylindrical permanent magnet assembly 75, the outer peripheral surface of the rectangular case 14 holding the imaging unit 1 inside, and the inner peripheral surface of the permanent magnet assembly 75 (permanent magnet 520). Of the permanent magnet 520, the first holder member 71, the second holder member 72, the stopper member 8, the square case 14, the reinforcing plate 19, and the imaging unit 1. Can be configured.

(Configuration of the spring member 600)
The spring member 600 includes a rectangular frame-shaped fixed side connecting portion 610 connected to the fixed body 200 side, a movable side connecting portion 620 connected to the movable body 3 side, a movable side connecting portion 620, and a fixed side connecting portion 610. The arm portions 630 are connected to the movable side connecting portion 620 and the fixed side connecting portion 610, respectively. In connecting this spring member 600 to the movable body 3 and the fixed body 200, in this embodiment, the movable side connecting portion 620 is fixed to the rear end surface in the optical axis direction of the stopper member 8 by a method such as welding. Further, the fixed side connecting portion 610 is fixed to the front end surfaces of the notches 218 and 219 of the upper cover 250 by welding or the like in a state of being fitted in the notches 218 and 219 of the upper cover 250. The spring member 600 is made of a nonmagnetic metal such as a copper alloy or a nonmagnetic SUS steel material, and is formed by pressing a thin plate having a predetermined thickness or etching using a photolithography technique.

  Here, when the movable side connecting portion 620 of the spring member 600 is connected to the movable body 3, and the fixed side connecting portion 610 is fixed to the fixed body 200, the movable body 3 is pushed up to the front side in the optical axis direction by the swing fulcrum 180. It will be in the state. For this reason, in the spring member 600, the movable side connecting portion 620 is pushed up to the front side in the optical axis direction relative to the fixed side connecting portion 610, and the arm portion 630 of the spring member 600 moves the movable body 3 to the rear side in the optical axis direction. Energize to. Therefore, the movable body 3 is urged toward the swing fulcrum 180 by the spring member 600, and the movable body 3 is supported by the fixed body 200 in a state where it can swing by the swing fulcrum 180. It becomes.

(Configuration of shake correction drive mechanism)
8 is a cross-sectional view of the optical unit according to Embodiment 1 of the present invention. FIGS. 8A and 8B are a YZ cross-sectional view and an XZ cross-sectional view of the optical unit.

  In the optical unit 100 of this embodiment, the shake correction drive mechanism 500 is configured by the coil 560 and the permanent magnet 520 that generates a magnetic field interlinking with the coil 560. More specifically, in the movable body 3, flat permanent magnets 520 are respectively fixed to the four outer surfaces of the rectangular case 14. In the fixed body 200, the inner surface of the rectangular tubular body 210 of the upper cover 250 is fixed. A coil 560 is provided. Permanent magnet 520 is magnetized with different poles on the outer surface side and inner surface side. The permanent magnet 520 is composed of two magnet pieces arranged in the direction of the optical axis L, and the magnet pieces are magnetized to poles whose surfaces facing the coil 560 are different in the optical axis direction. The coil 560 is formed in a rectangular frame shape, and the upper and lower long sides are used as effective sides. Further, the permanent magnet 520 may be magnetized so that one magnet has two different poles facing the effective side of the coil 560 in the optical axis direction.

  As shown in FIGS. 4 and 8, the permanent magnet 520 and the coil 560 disposed at two positions sandwiching the movable body 3 on both sides in the Y-axis direction among the permanent magnet 520 and the coil 560 are a Y-side shake correction drive mechanism. As shown by an arrow Y0 in FIG. 8 (a), the movable body 3 is swung in the Y-axis direction around an axis extending in the X-axis direction through the swinging fulcrum 180. . Further, the permanent magnet 520 and the coil 560 disposed at two positions sandwiching the imaging unit 1 on both sides in the X-axis direction constitute an X-side shake correction drive mechanism 500x, and is indicated by an arrow X0 in FIG. 8B. As described above, the movable body 3 is swung in the X-axis direction around the axis extending in the Y-axis direction through the rocking fulcrum 180.

  In configuring the Y-side shake correction drive mechanism 500y and the X-side shake correction drive mechanism 500x, in this embodiment, the inner surface of the belt-like portion 425 of the flexible wiring board 420 extending along the four inner surfaces of the upper cover 250. And what stuck the board | substrate 550 which supports the coil 560, and the plate-shaped reinforcement member 428 made from a polyimide to the outer surface is used, respectively. The coil 560 has a structure in which fine copper wiring is formed on the substrate 550 using a conductive wiring technique, and a plurality of layers of copper wiring (coil 560) are formed in multiple layers via an insulating film. . The surface of the copper wiring (coil 560) is also covered with an insulating film. Examples of the coil 560 include an FP coil (Fine Pattern Coil (registered trademark)) manufactured by Asahi Kasei Microdevices Corporation.

  Of the belt-like portion 425 of the flexible wiring board 420, a photo reflector 580 is mounted on a portion located on one side + Y in the Y-axis direction, and a photo reflector 590 is mounted on a portion located on one side + X in the X-axis direction. ing. The photo reflectors 580 and 590 are opposed to the side surface of the movable body 3 (side surface of the rectangular case 14) through the hole formed in the substrate 550. In this embodiment, reflection sheets 581 and 591 are affixed at positions facing the photo reflectors 580 and 590 on the side surface of the movable body 3 (side surface of the rectangular case 14).

(Configuration of stopper mechanism)
In the optical unit 100 of this embodiment, the movable body 3 is in a state of being supported by the fixed body 200 so as to be swingable by the swing support point 180. Therefore, when the imaging unit 1 is largely displaced due to a large force applied from the outside, the arm portion 630 of the spring member 600 may be plastically deformed. Therefore, in this embodiment, in the movable body 3, a rectangular frame-shaped stopper member 8 is fixed to the rear end surface in the optical axis direction of the holder 7 by a method such as welding. The stopper member 8 includes a rectangular frame-shaped main body portion 810 and a convex portion 81 projecting outward at the corner of the main body portion 810, and the convex portion 81 projects outward from the permanent magnet 520. . Here, the convex portion 81 faces the substrate 550 provided on the fixed body 200 side through a narrow gap. Accordingly, the convex portion 81 and the substrate 550 define a movable range when the movable body 3 is displaced in a direction perpendicular to the optical axis direction between the shake correction drive mechanism 500 and the swing fulcrum 180 in the optical axis direction. The stopper mechanism is configured. In addition, the location where the convex portion 81 abuts is set in the location where the coil 560 is not configured in the substrate 550.

(Shake correction operation)
In the optical unit 100 described with reference to FIGS. 1 to 8, shake correction described below is performed. The timing for executing shake correction is defined by a command signal from the outside of the optical unit 100 (optical device main body). Specifically, when a command signal is output when the shooting start switch such as the shutter button is pressed halfway, the command signal is output when the shooting start switch is pressed halfway and the autofocus operation is completed. Is output, the command signal may be output when the imaging start switch is pressed deeply. In addition, camera shake correction may be always performed while an image captured by the camera is displayed on the monitor unit.

  In this embodiment, when the optical apparatus 1000 and the optical unit 100 shown in FIG. 1 are shaken by hand shake or the like, such shake is detected by the shake detection sensor 170, and the drive control unit 900 corrects a drive current that cancels the shake. This is supplied to the drive mechanism 500. As a result, the shake correction drive mechanism 500 swings the movable body 3 (imaging unit 1) around the swing fulcrum 180 to correct the shake. More specifically, the X-side shake correction driving mechanism 500x shown in FIG. 8B oscillates the imaging unit 1 around the Y axis around the swing fulcrum 180 to correct the shake in the X direction, A Y-side shake correction drive mechanism 500y shown in FIG. 8A oscillates the imaging unit 1 about the X axis around the swing fulcrum 180 to correct the shake in the Y direction. Further, if the swing of the imaging unit 1 around the X axis and the swing around the Y axis are combined, the movable body 3 can be swung in all directions. Therefore, all shakes assumed in the optical unit 100 can be reliably corrected. When driving the movable body 3, the swing of the movable body 3 is monitored by the photo reflectors 580 and 590.

  Here, in the movable body 3, as described with reference to FIGS. 2, 3, and 4, the corners 3a, 3b, 3c, and 3d of the front surface portion 31 are formed with the recessed portions 3f that are recessed toward the rear side in the optical axis direction. Has been. For this reason, when the movable body 3 is swung diagonally, the corners 3a and 3c and the corners 3b and 3d become the front plate before the top surface portion 31s of the front surface portion 31 comes into contact with the front plate portion 220 of the fixed body 200. The situation of contacting the portion 220 does not occur. Therefore, the angle range in which the movable body 3 can swing is wide without providing a wide gap in the optical axis direction between the front surface portion 31 of the movable body 3 and the front plate portion 220 of the fixed body 200.

  Further, when the movable body 3 is displaced forward in the optical axis direction due to an impact from the outside, the front surface portion 31 (the top surface portion 31 s) of the movable body 3 comes into contact with the front plate portion 220 of the fixed body 200 and further displacement is caused. Be blocked. Here, since the distance in the optical axis direction between the front surface portion 31 of the movable body 3 and the front plate portion 220 of the fixed body 200 is relatively short, the distance that the movable body 3 can be displaced forward in the optical axis direction is short. Therefore, even when the movable body 3 is displaced forward in the optical axis direction, it is possible to prevent plastic deformation from occurring in the spring member 600 shown in FIG.

(Main effects of this form)
As described above, in the optical unit 100 of the present embodiment, the swing fulcrum 180 that allows the movable body 3 to be swingably supported with respect to the fixed body 200 is elastically deformable in the direction of the optical axis L. . For this reason, when the movable body 3 is displaced rearward in the optical axis direction by an external impact, the swing fulcrum 180 can be elastically deformed in the optical axis L direction, and therefore can absorb the impact.

  The reinforcing plate 19 (rear plate portion) constituting the rear surface portion 39 of the movable body 3 has a lower case than the end plate portion 191 at a position overlapping the end plate portion 191 with respect to the swing fulcrum 180 in the optical axis L direction. 700 (fixed body 200) is provided with a convex bottom portion 193 protruding toward the bottom plate portion 710. The convex bottom portion 193 overlaps the swing fulcrum 180 on the front side in the optical axis direction, and the first bottom portion 194 overlaps with the first bottom portion 194. And a second bottom portion 195 facing the bottom plate portion 710 on the rear side in the optical axis direction from the bottom portion 194. For this reason, since there is a gap between the bottom of the convex bottom 193 (the first bottom 194 and the second bottom 195) and the rigid substrate 413 that holds the image sensor 1b, the movable body 3 is rearward in the optical axis direction. The force when displaced to the side is not directly transmitted from the reinforcing plate 19 to the rigid substrate 413. Further, since the force when the movable body 3 is displaced rearward in the optical axis direction is dispersed throughout the convex bottom portion 193, a situation in which a large force is concentrated and transmitted to a specific portion of the rigid substrate 413 hardly occurs. Therefore, it is difficult for the image pickup device 1b to be damaged.

In addition, since the convex bottom portion 193 includes the second bottom portion 195 facing the bottom plate portion 710 on the rear side in the optical axis direction from the first bottom portion 194, even when the movable body 3 is largely displaced rearward in the optical axis direction. The second bottom portion 195 contacts the bottom plate portion 710 and functions as a stopper. Therefore, the swing fulcrum 180 does not deform excessively. Moreover, the bottom plate portion 710 at a position opposite rear side in the optical axis direction in the first bottom portion 19 4, the second bottom 195 as viewed from the first bottom 194 is thicker rubber than the dimension which projects after the optical axis direction Since the plate-like portion 183 is provided, when the movable body 3 is largely displaced rearward in the optical axis direction, the first bottom portion 194 first comes into contact with the rubber-made plate-like portion 183. Therefore, it is possible to absorb an impact when the movable body 3 is displaced rearward in the optical axis direction.

  Further, in the reinforcing plate 19, the second bottom portion 195 and the end plate portion 191 are connected so as to spread on the outer peripheral side by the tapered surfaces 193a and 193b, and therefore when the movable body 3 is displaced rearward in the optical axis direction. When the force is transmitted from the convex bottom portion 193 to the end plate portion 191, the force is distributed and transmitted. In addition, the convex bottom portion 193 has an outer peripheral shape including arc portions 193e and 193f centered on the swing fulcrum 180 at two positions on both sides sandwiching the swing fulcrum 180 therebetween. For this reason, even when the movable body 3 is swung in any direction, the movable body 3 is unlikely to come into contact with the bottom plate portion 710 of the lower cover 700. Further, when the force when the movable body 3 is displaced rearward in the optical axis direction is transmitted from the convex bottom portion 193 to the end plate portion 191, the force is distributed and transmitted. For this reason, a situation in which a large force is concentrated and transmitted to a specific portion of the rigid substrate 413 is unlikely to occur, so that the imaging element 1b is not easily damaged. Moreover, since the 2nd bottom part 195 and the end plate part 191 are connected so that it may spread on the outer peripheral side by the taper surfaces 193a and 193b, there is no angular step part. Therefore, even when a wiring material such as the flexible wiring board 410 is positioned between the movable body 3 and the bottom plate portion 710 of the lower case 700, there is an advantage that the wiring material is not easily caught.

  The convex bottom portion 193 has an oval outer peripheral shape in which the ends of the arc portions 193e and 193f are connected by the straight portions 193g and 193h. For this reason, the area | region in which the linear parts 193g and 193h are provided in the convex bottom part 193 can be utilized as a part which lets wiring materials, such as the flexible wiring board 410, pass. Moreover, the diameter of the circular arc formed on the outer periphery of the convex bottom portion 193 is larger than the dimension of the side when the image sensor 1b is viewed from the optical axis direction, and the convex bottom portion 193 projects outward from the image sensor 1b. ing. For this reason, it is difficult for the force when the movable body 3 is displaced rearward in the optical axis direction to be concentrated and transmitted to a specific portion of the image sensor 1b.

[Embodiment 2]
FIG. 9 is an explanatory diagram showing a cross-sectional configuration of a swing fulcrum configured in an optical unit with a shake correction function according to Embodiment 2 of the present invention. FIGS. 9 (a) and 9 (b) are diagrams of the optical unit. It is the YZ sectional view around the rocking fulcrum, and the XZ sectional view. In FIG. 9, the rigid substrate 413 is illustrated, but the flexible wiring substrate 410 is not illustrated. The basic configuration of the present embodiment and the basic configuration of the embodiment described below are the same as those of the first embodiment, and therefore, common portions are denoted by the same reference numerals and the description thereof is omitted. Is omitted.

In the first embodiment, the swing fulcrum 180 is composed of the swing fulcrum elastic member 182 fixed to the hole 710a formed in the bottom plate portion 710 of the lower cover 700, as shown in FIG. In addition, in this embodiment, the swing fulcrum 180 is a plate that receives the convex portion 199 protruding from the first bottom portion 194 of the reinforcing plate 19 toward the bottom plate portion 710 of the lower case 700 and the convex portion 199 on the bottom plate portion 710 side. Shaped elastic member 185. Also in the swing support point 180 of such a configuration, in a position facing the optical axis direction of the rear side to the second bottom 195 at the bottom plate portion 710, the first bottom 19 4 as viewed from the first bottom 194 protrudes after the optical axis direction The rubber plate-like portion 183 that is thicker than the dimension is provided. Other configurations are the same as those of the first embodiment.

  According to such a configuration, in addition to the same effects as those of the first embodiment, when the position of the movable body 3 is displaced, the convex portion 199 is also displaced, so that the oscillation center is always located on the optical axis L. is there.

[Other embodiments]
In the above embodiment, the convex bottom portion 193 has an oval outer peripheral shape including arc portions 193e and 193f centered on the swing fulcrum 180 at two positions on both sides sandwiching the swing fulcrum 180 therebetween. However, the convex bottom 193 may be configured to have a circular planar shape with the swing fulcrum 180 as the center.

  In the above-described embodiment, the shake detection sensor 170 made of a gyroscope is used as the shake detection unit. However, the optical unit 100 uses the system that detects the shake by the shift of the image obtained by the image sensor 1b as the shake detection unit. The present invention may be applied to.

  In addition, the optical unit 100 with a shake correction function to which the present invention is applied is fixed in a device having vibration at regular intervals, such as a refrigerator, in addition to a mobile phone, a digital camera, etc. It can also be used for a service that can obtain information inside the refrigerator when going out, for example, when shopping. In such a service, since it is a camera system with a posture stabilization device, a stable image can be transmitted even if the refrigerator vibrates. Further, the present apparatus may be fixed to a device worn at the time of attending school, such as a student's bag, a student's bag, a school bag, or a hat. In this case, when the surroundings are photographed at regular intervals and the image is transferred to a predetermined server, the guardian or the like can observe the image in a remote place to ensure the safety of the child. In such an application, a clear image can be taken even if there is vibration during movement without being aware of the camera. If a GPS is installed in addition to the camera module, the location of the target person can be acquired at the same time. In the event of an accident, the location and situation can be confirmed instantly. Furthermore, if the optical unit 100 with a shake correction function to which the present invention is applied is mounted at a position where the front can be photographed in an automobile, it can be used as a drive recorder. In addition, the optical unit 100 with a shake correction function to which the present invention is applied is mounted at a position where the front of the vehicle can be photographed, and peripheral images are automatically photographed at regular intervals and automatically transferred to a predetermined server. Also good. Further, by distributing this image in conjunction with traffic jam information such as a car navigation road traffic information communication system, the traffic jam status can be provided in more detail. According to such a service, the situation at the time of an accident or the like can be recorded unintentionally by a third party who has passed unintentionally as well as a drive recorder mounted on a car, and can be used for inspection of the situation. In addition, a clear image can be acquired without being affected by the vibration of the automobile. In such an application, when the power is turned on, a command signal is output to the control unit, and shake control is started based on the command signal.

1 Imaging unit 1a Lens (optical element)
1b Image sensor 3 Movable body 19 Reinforcing plate (rear plate)
100 Optical unit 180 with shake correction function Swing fulcrum 182 and 185 Elastic member 183 Plate-like part 193 Convex bottom part 193a and 193b Tapered surface 193e and 193f Arc part 194 First bottom part 195 Second bottom part 199 Convex part 200 Fixed body 413 Rigid substrate (substrate)
500 shake correction drive mechanism 500x X side shake correction drive mechanism 500y Y side shake correction drive mechanism 520 permanent magnet 560 coil 600 spring member 700 lower case (fixed body)
710 Bottom plate

Claims (7)

An imaging device, a substrate that holds the imaging device, and a movable body that includes a rear plate portion that overlaps the rear side in the optical axis direction of the substrate;
A fixed body having a bottom plate portion facing the rear plate portion on the rear side in the optical axis direction;
A swing fulcrum configured at a position overlapping the image sensor in the optical axis direction between the rear plate portion and the bottom plate portion;
A drive mechanism for swinging the movable body with respect to the fixed body around the swing fulcrum;
In an optical unit having
The swing fulcrum is elastically deformable in the optical axis direction,
The rear plate portion includes an end plate portion, and a convex bottom portion protruding from the end plate portion toward the bottom plate portion at a position overlapping with the swing fulcrum in the optical axis direction,
The convex bottom portion includes a first bottom portion that overlaps the swing fulcrum on the front side in the optical axis direction, and a second bottom portion that faces the bottom plate portion on the rear side in the optical axis direction from the first bottom portion ,
The swing fulcrum includes an elastic member,
The swing fulcrum protrudes so that the elastic member abuts on the first bottom portion from the bottom plate portion side, or a protruding portion protruding from the first bottom portion toward the bottom plate portion is the bottom plate portion. The elastic member receives on the side of
The elastic member is made of rubber,
A rubber plate-like portion thicker than a dimension in which the second bottom portion protrudes rearward in the optical axis direction when viewed from the first bottom portion at a position facing the first bottom portion on the rear side in the optical axis direction in the bottom plate portion. An optical unit characterized in that is provided .   The optical unit according to claim 1, wherein the second bottom portion and the end plate portion are connected by a tapered surface. The said 2nd bottom part is provided with the outer periphery shape provided with the circular arc part centering on the said rocking | fluctuation fulcrum in two places on both sides on both sides of the said rocking | fluctuation fulcrum . Optical unit. The convex bottom portion has an outer peripheral shape in which an end portion of one arc portion of the arc portions formed at two locations on both sides and an end portion of the other arc portion are connected by a linear portion. The optical unit according to claim 3 . The optical unit according to claim 3 , wherein the convex bottom portion has a circular outer peripheral shape centering on the swing fulcrum . The diameter of the circular arc which is formed on the outer periphery of the convex bottom, to any one of claims 3 to 5, characterized in that said is larger than the dimension of the sides when the image pickup element viewed from the optical axis The optical unit described. The drive mechanism is any one of claims 1 to 6, wherein said that the movable body so as to correct the deflection of the fixed body is a shake correction drive mechanism swings around the swing fulcrum The optical unit according to item .

Images