Optical unit with shake correction function

Abstract

An optical unit with a shake correction function includes a fixed body that holds a reflection section that reflects incident light from the outside so as to be rotatable, is capable of reducing the number of components that constitute a rotation fulcrum of the reflection section with respect to the fixed body, and is capable of bringing the rotation fulcrum of the reflection section with respect to the fixed body close to the center of gravity of the reflection section. In the optical unit with a shake correction function (1), a fixed body (14) that holds a reflection section (13) includes a shaft member (18) that protrudes toward the center side of the reflection section. The reflection section is formed with a placement recess (21) that places a portion of the shaft member, and the placement recess is formed with a contact section (12b) that contacts the front end section of the shaft member. A spring member (16) that exerts a force on the reflection section exerts a force on the reflection section in a direction in which the contact section (12b) contacts the front end section of the shaft member, and the front end section of the shaft member, which is formed in a semispherical shape, becomes the rotation fulcrum of the reflection section with respect to the fixed body.

Description

TECHNICAL FIELD

[0001] The present application relates to an optical unit with a shake correction function for correcting a shake of an optical image. BACKGROUND

[0002] Conventionally, a camera module having a shake correction function for correcting a shake of an optical image is known (for example, refer to Patent Literature 1). The camera module described in Patent Literature 1 has a reflection module, a lens module, and an image sensor module disposed in a housing. The reflection module has a reflection member that reflects light and a rotation holder that holds the reflection member fixed. In addition, the reflection module includes a first bead, a rotation plate, and a second bead. The first bead is disposed between a wall surface of the housing and the rotation plate. The first bead is disposed at two places at a state of being separated by an interval in the X-axis direction. The second bead is disposed between the rotation plate and the rotation holder. The second bead is disposed at two places at a state of being separated by an interval in the Y-axis direction.

[0003] In the camera module described in Patent Literature 1, the first bead is brought into contact with the wall surface of the housing and the rotation plate at a prescribed contact pressure by a magnetic attraction force acting between a permanent magnet attached to the rotation holder and a magnetic yoke attached to the wall surface of the housing, and the second bead is brought into contact with the rotation plate and the rotation holder at a prescribed contact pressure. In this camera module, the reflection member is able to rotate with the two first beads as fulcrums, with the X-axis direction as the axis of rotation, with respect to the wall surface of the housing and the rotation plate and the rotation holder. In addition, the reflection member is able to rotate with the two second beads as fulcrums, with the Y-axis direction as the axis of rotation, with respect to the rotation plate and the rotation holder. In this camera module, the reflection member is rotated in the X-axis direction or the Y-axis direction as the axis of rotation, and the shake correction of the optical image is performed.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] Patent Literature 1: U.S. Patent Application Publication No. 2018 / 0224665 Specification SUMMARY

[0007] In the camera module described in Patent Literature 1, the first bead disposed between the wall surface of the housing and the rotation plate becomes a fulcrum of the rotation of the reflection member in the X-axis direction. In addition, in this camera module, the second bead disposed between the rotation plate and the rotation holder becomes a fulcrum of the rotation of the reflection member in the Y-axis direction. Therefore, in this camera module, the rotation fulcrums of the reflection member and the rotation holder that rotate with respect to the housing are disposed at positions apart from the center of the reflection member and the rotation holder, and are disposed at positions apart from the center of gravity of the reflection member and the rotation holder.

[0008] Therefore, in the camera module described in Patent Literature 1, it can be difficult to smoothly rotate the reflection member fixed to the rotation holder with respect to the housing. In addition, in the camera module, since the rotation fulcrum of the reflection member and the rotation holder with respect to the housing is constituted by two first beads and two second beads, the number of components constituting the rotation fulcrum of the reflection member and the rotation holder increases.

[0009] Therefore, the technical problem of the present application is to provide an optical unit with a shake correction function, the optical unit with the shake correction function having a reflection portion having a reflection member in which a reflection surface that reflects light incident from the outside is formed, and a fixing body that holds the reflection portion so as to be rotatable, the optical unit with the shake correction function being able to reduce the number of components constituting a rotation fulcrum of the reflection portion with respect to the fixing body, and to make the rotation fulcrum of the reflection portion with respect to the fixing body approach a center of gravity of the reflection portion.

[0010] To solve the above technical problem, the optical unit with the shake correction function of the present application is characterized by including: a reflection portion having a reflection member in which a reflection surface that reflects light incident from the outside is formed; a fixing body that holds the reflection portion; a driving mechanism that rotates the reflection portion with respect to the fixing body; and a spring member that applies a force to the reflection portion, the fixing body including a shaft member that protrudes toward a center side of the reflection portion, a front end portion of the shaft member being formed in a semispherical shape, the reflection portion including a placement recess in which at least a portion of the shaft member is placed, a contact portion that contacts the front end portion of the shaft member being formed in the placement recess, the spring member applying a force to the reflection portion with respect to the fixing body in a direction in which the contact portion contacts the front end portion of the shaft member, and the front end portion of the shaft member being a rotation fulcrum of the reflection portion with respect to the fixing body.

[0011] In the optical unit with the shake correction function of the present application, the fixing body includes a shaft member that protrudes toward a center side of the reflection portion, and a front end portion of the shaft member that is formed in a semispherical shape is a rotation fulcrum of the reflection portion with respect to the fixing body. Therefore, in the present application, it is possible to reduce the number of components constituting the rotation fulcrum of the reflection portion with respect to the fixing body. In addition, in the present application, the reflection portion includes a placement recess in which at least a portion of the shaft member that protrudes toward the center side of the reflection portion is placed, a contact portion that contacts the front end portion of the shaft member is formed in the placement recess, and the front end portion of the shaft member is the rotation fulcrum of the reflection portion with respect to the fixing body. Therefore, in the present application, it is possible to make the rotation fulcrum of the reflection portion with respect to the fixing body approach a center of gravity of the reflection portion.

[0012] In addition, in the present application, the spring member exerts a force on the reflection portion with respect to the fixed body in a direction in which the contact portion contacts the front end portion of the shaft member, and thus, when the driving force of the driving mechanism is not acting, the reflection portion can be returned to a prescribed home position by the force of the spring member with respect to the fixed body. In addition, in the camera module described in Patent Document 1, when the driving force for rotating the reflection member is not acting, the reflection member cannot be returned to a prescribed home position with respect to the housing.

[0013] In the present application, for example, the axial direction of the shaft member is orthogonal to a first direction that is the optical axis direction of light incident on the reflection surface. In this case, compared to a case in which the axial direction of the shaft member is parallel to the first direction, the optical unit with shake correction can be made smaller in the optical axis direction of light incident on the reflection surface.

[0014] In the present application, for example, the driving mechanism includes a first driving mechanism that rotates the reflection portion with respect to the fixed body in a first direction that is the axial direction of rotation, and a second driving mechanism that rotates the reflection portion with respect to the fixed body in a second direction that is the axial direction of rotation orthogonal to the axial direction of the shaft member and the first direction.

[0015] In the present application, it is preferable that the first driving mechanism include a first driving magnet and a first driving coil that are arranged opposite each other in the second direction, and a first magnetic sensor that detects the amount of rotation of the reflection portion with respect to the fixed body in the direction of rotation in the first direction that is the axial direction of rotation, the second driving mechanism include a second driving magnet and a second driving coil that are arranged opposite each other in the first direction, and a second magnetic sensor that detects the amount of rotation of the reflection portion with respect to the fixed body in the direction of rotation in the second direction that is the axial direction of rotation, the first magnetic sensor is arranged opposite the first driving magnet in the second direction, the second magnetic sensor is arranged opposite the second driving magnet in the first direction, the first driving magnet and the second driving magnet are polarized to be bipolar in the axial direction of the shaft member, and when the reflection portion is arranged at a prescribed home position with respect to the fixed body, at least either one of the polarization position of the first driving magnet and the polarization position of the second driving magnet is arranged at the same position as the front end portion of the shaft member in the axial direction of the shaft member.

[0016] If configured in this way, it is possible to suppress variation in at least either one of the output signal of the first magnetic sensor when the reflection portion is rotated with respect to the fixed body from the home position with the second direction as the axial direction of rotation, and the output signal of the second magnetic sensor when the reflection portion is rotated with respect to the fixed body from the home position with the first direction as the axial direction of rotation. Thus, it is possible to improve at least either one of the detection accuracy of the first magnetic sensor of the amount of rotation of the reflection portion, and the detection accuracy of the second magnetic sensor of the amount of rotation of the reflection portion.

[0017] In the present application, the spring member is, for example, a tension spring. In this case, the tension spring is preferably a tension coil spring, and the shaft member is arranged on the inner peripheral side of the tension coil spring. If so configured, it is possible to shorten the distance between the point of action of the tension coil spring on the reflecting portion and the turning fulcrum of the reflecting portion (i.e., the front end portion of the shaft member) in the first direction, and the distance between the point of action of the tension coil spring on the reflecting portion and the turning fulcrum of the reflecting portion in the second direction. Therefore, it is possible to suppress the reduction in the driving force of the reflecting portion in the turning direction of the shaft in the first direction and the driving force of the reflecting portion in the turning direction of the shaft in the second direction due to the influence of the force of the tension coil spring.

[0018] In the present application, the outer diameter of one end of the tension coil spring arranged on the reflecting portion side is preferably smaller than the outer diameter of the other end of the tension coil spring arranged on the fixed body side. If so configured, it is possible to prevent interference between the reflecting portion and the tension coil spring when the reflecting portion turns with respect to the fixed body with the front end portion of the shaft member as the fulcrum.

[0019] In the present application, the shaft member preferably has a cylindrical tube and a spherical bead fixed to the front end of the tube, the outer diameter of the bead is larger than the inner diameter of the tube, and a part of the bead constitutes the front end portion of the shaft member. If so configured, even if the shaft member is thin, it is possible to position the bead on the inner peripheral side of the end face of the tube so that the center of the bead is arranged on the axis of the shaft member. Therefore, even if the shaft member is thin, it is possible to easily arrange the center of the bead on the axis of the shaft member. In addition, if so configured, when the bead is fixed to the front end of the tube, it is possible to temporarily fix the bead to the front end of the tube, for example, by sucking air on the inner peripheral side of the tube from the base end of the tube. Therefore, even if the shaft member is thin, the tube is thin and the bead is small, making it difficult to handle the tube and the bead, it is possible to easily perform the fixing work of the bead.

[0020] Effects of the Invention

[0021] As described above, in the present application, in an optical unit having a shake correction function, which has a reflecting portion having a reflecting member in which a reflecting surface that reflects light incident from the outside is formed, and a fixed body that holds the reflecting portion so as to be able to turn, it is possible to reduce the number of components that constitute the turning fulcrum of the reflecting portion with respect to the fixed body, and to bring the turning fulcrum of the reflecting portion with respect to the fixed body close to the center of gravity of the reflecting portion. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a perspective view of an optical unit with a shake correction function according to an embodiment of the present application.

[0023] Figure 2 is a perspective view of a smartphone in which the optical unit with a shake correction function shown in Figure 1 is a perspective view of a smartphone in which the optical unit with a shake correction function shown in

[0024] Figure 3 is a schematic diagram for explaining the structure of a camera built in Figure 2 the smartphone shown in FIG. 1.

[0025] Figure 4 is Figure 1 is an exploded perspective view of the optical unit with a shake correction function shown in FIG. 1.

[0026] Figure 5 is Figure 1 is a longitudinal sectional view of the optical unit with a shake correction function shown in FIG. 1.

[0027] Figure 6 is Figure 1 is a transverse sectional view of the optical unit with a shake correction function shown in FIG. 1.

[0028] Figure 7 is a plan view in which the shaft member, the first drive magnet, and the second drive magnet shown in FIG. 1 are extracted. Figure 4 DETAILED DESCRIPTION

[0029] Hereinafter, an embodiment of the present application will be described with reference to the drawings.

[0030] (Structure of optical unit with shake correction function)

[0031] Figure 1 is a perspective view of the optical unit with a shake correction function 1 of the embodiment of the present application. Figure 2 is a perspective view of the smartphone 2 in which the optical unit with a shake correction function 1 shown in FIG. 1 is built in. Figure 1 Figure 3 is a schematic diagram for explaining the structure of a camera built in Figure 2 the smartphone 2 shown in FIG. 1. Figure 4 is Figure 1 is an exploded perspective view of the optical unit with a shake correction function 1 shown in FIG. 1. Figure 5 is Figure 1 is a longitudinal sectional view of the optical unit with a shake correction function 1 shown in FIG. 1. Figure 6 is Figure 1 is a transverse sectional view of the optical unit with a shake correction function 1 shown in FIG. 1. Figure 7 is a plan view in which the shaft member 18 and the drive magnets 27, 31 shown in FIG. 1 are extracted. Figure 4

[0032] The optical unit with a shake correction function 1 (hereinafter referred to as "optical unit 1") of the embodiment has a shake correction function for correcting a shake of an optical image. The optical unit 1 is, for example, a small unit built in a smartphone 2 (refer to Figure 2 ). The optical unit 1 constitutes a camera 3 (refer to​​​Figure 3 In addition, the optical unit 1 can be built in a portable device other than the smartphone 2, and the like.

[0033] As shown in FIG. 1, the smartphone 2 is equipped with a camera 3. The camera 3 is a part of the smartphone 2. In addition, the optical unit 1 can be built in a portable device other than the smartphone 2, and the like. Figure 3 As shown in FIG. 2, the camera 3 is equipped with a lens 4, from the outside of which light from the smartphone 2 is incident, and a substrate 6 on which a camera element 5 is mounted. An optical axis L1 of the lens 4 is orthogonal to a normal line L2 passing through the center of the imaging surface of the camera element 5. The optical unit 1 is disposed between the lens 4 and the camera element 5 on an optical path from the lens 4 toward the camera element 5. A lens 7 is disposed between the optical unit 1 and the camera element 5. An optical axis of the lens 7 coincides with the normal line L2.

[0034] The optical unit 1 is equipped with a prism 10 as a reflection member, which is formed with a reflection surface 10a that reflects light incident from the outside. Light that has passed through the lens 4 is incident to the reflection surface 10a. The reflection surface 10a reflects light that has been incident to the reflection surface 10a via the lens 4 toward the camera element 5. The reflection surface 10a bends the optical axis of light that has been incident to the reflection surface 10a by substantially 90°. Light that has been reflected by the reflection surface 10a passes through the lens 7, and light that has passed through the lens 7 is incident to the camera element 5.

[0035] In the following description, the direction of the optical axis of light that has been incident to the reflection surface 10a (i.e., the direction of the optical axis L1 of the lens 4, the Z direction of the smartphone 2, and the like) is set as the up-down direction, the direction of the normal line L2 of the imaging surface of the camera element 5 (the X direction of the smartphone 2, and the like) is set as the front-rear direction, and the direction orthogonal to the up-down direction and the front-rear direction (the Y direction of the smartphone 2, and the like) is set as the left-right direction. In addition, the side in the up-down direction on which the lens 4 is disposed with respect to the optical unit 1 (the Z1 direction side of the smartphone 2, and the like) is set as the "upper" side, and the opposite side thereof, i.e., the Z2 direction side of the smartphone 2, and the like, is set as the "lower" side. In addition, the side in the front-rear direction on which the camera element 5 is disposed with respect to the optical unit 1 (the X1 direction side of the smartphone 2, and the like) is set as the "front" side, and the opposite side thereof, i.e., the X2 direction side of the smartphone 2, and the like, is set as the "rear" side. Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1

[0036] ​​​​​​​In addition to the prism 10, the optical unit 1 also includes a holder 11 for fixing the prism 10 and a fixing plate 12 fixed to the holder 11. In this embodiment, the reflective portion 13 is constituted by the prism 10, the holder 11, and the fixing plate 12. That is, the optical unit 1 includes a reflective portion 13 having the prism 10, the holder 11, and the fixing plate 12. Furthermore, the optical unit 1 includes a fixing body 14 for holding the reflective portion 13, a drive mechanism 15 for rotating the reflective portion 13 relative to the fixing body 14, and a tension coil spring 16 that applies force to the reflective portion 13 as a spring member. The fixing body 14 has a frame 17 and a shaft member 18 fixed to the frame 17. The optical unit 1 corrects the jitter of the optical image by rotating the reflective portion 13 relative to the fixing body 14.

[0037] The retainer 11 is formed of resin material. An inclined surface 11a for fixing the prism 10 is formed on the retainer 11 (see reference). Figure 5 The inclined surface 11a is inclined downwards as it moves towards the front. The inclined surface 11a is formed between the lower front end and the upper rear end of the retainer 11. The rear surface of the retainer 11 is formed as a plane substantially orthogonal to the front-rear direction. Recesses 11b are formed on both sides of the retainer 11 in the left-right direction, and the drive magnets 27 (described later) constituting the drive mechanism 15 are disposed in these recesses 11b. The recesses 11b are recessed inwards in the left-right direction. A recess 11c is formed on the lower surface of the retainer 11, and the drive magnets 31 (described later) constituting the drive mechanism 15 are disposed in these recesses 11c. The recesses 11c are recessed upwards.

[0038] A through hole 11d is formed in the retainer 11, extending through the retainer 11 in the front-rear direction. The opening at the rear end of the through hole 11d is formed at the center of the rear surface of the retainer 11. An annular recess 11e is formed on the rear surface of the retainer 11. The recess 11e is recessed towards the front. The recess 11e is formed in an annular shape surrounding the opening at the rear end of the through hole 11d. The front end portion of the through hole 11d is blocked by the fixing plate 12. In this embodiment, the portion of the through hole 11d that is further rearward than the fixing plate 12 and the fixing plate 12 constitute a configuration recess 21 that is part of the configuration shaft member 18. That is, a configuration recess 21 that is part of the configuration shaft member 18 is formed on the reflective portion 13.

[0039] The configuration recess 21 is constituted by a small-diameter portion 21a constituting a front end portion of the configuration recess 21, a large-diameter portion 21b constituting a rear end portion of the configuration recess 21, and a tapered portion 21c disposed between the small-diameter portion 21a and the large-diameter portion 21b in the front-rear direction. The small-diameter portion 21a and the large-diameter portion 21b are circular holes having constant inner diameters. The inner diameter of the large-diameter portion 21b is larger than the inner diameter of the small-diameter portion 21a. The tapered portion 21c is a circular truncated cone-shaped circular hole whose inner diameter gradually decreases toward the front side. The inner diameter of the front end of the tapered portion 21c is equal to the inner diameter of the small-diameter portion 21a, and the inner diameter of the rear end of the tapered portion 21c is equal to the inner diameter of the large-diameter portion 21b.

[0040] The fixed plate 12 is formed of a metal material. For example, the fixed plate 12 is formed of stainless steel. The fixed plate 12 is constituted by a circular ring-shaped and flat plate-shaped fixed portion 12a fixed to the holder 11 and a curved plate-shaped contact portion 12b connected to an inner peripheral end of the fixed portion 12a. The fixed portion 12a is fixed to the holder 11 in such a manner that the thickness direction thereof is substantially in agreement with the front-rear direction. The contact portion 12b is formed in a substantially hemispherical shape bulging toward the front side, and a rear surface of the contact portion 12b is formed in a concave curved surface recessed toward the front side. Specifically, the rear surface of the contact portion 12b is a concave curved surface in a hemispherical shape. The front end portion of the shaft member 18 is in contact with the contact portion 12b. That is, the contact portion 12b in contact with the front end portion of the shaft member 18 is formed in the configuration recess 21.

[0041] As described above, the fixed body 14 has the frame 17 and the shaft member 18. The frame 17 is formed of a resin material. The frame 17 has two side surface portions 17a constituting side surfaces in the left-right direction, a bottom surface portion 17b constituting a bottom surface (lower surface), a back surface portion 17c constituting a rear surface, and a shaft holding portion 17d protruding toward the front side from the back surface portion 17c. The reflection portion 13 is disposed between the two side surface portions 17a in the left-right direction. In addition, the reflection portion 13 is disposed on the upper side of the bottom surface portion 17b and on the front side of the back surface portion 17c.

[0042] A through-hole 17e for disposing a driving coil 28 constituting the driving mechanism 15 described later is formed in the side surface portion 17a. A through-hole 17f for disposing a driving coil 32 constituting the driving mechanism 15 described later is formed in the bottom surface portion 17b. The shaft holding portion 17d protrudes toward the front side from the center of the back surface portion 17c. The shaft holding portion 17d is formed in a substantially cylindrical shape, and a shaft holding hole 17g penetrating in the front-rear direction is formed in the shaft holding portion 17d and the back surface portion 17c. The shaft holding hole 17g is a circular hole having a constant inner diameter. A circular ring-shaped recess 17h is formed in the front surface of the back surface portion 17c. The recess 17h is recessed toward the rear side. The recess 17h is formed in a circular ring shape so as to surround the shaft holding portion 17d.

[0043] The shaft holding portion 17d is composed of a first holding portion 17j that constitutes a front side portion of the shaft holding portion 17d and a second holding portion 17k that constitutes a rear side portion of the shaft holding portion 17d. The outer diameter of the first holding portion 17j is constant. The outer diameter of the second holding portion 17k gradually increases toward the rear side. The outer diameter of the front end of the second holding portion 17k is equal to the outer diameter of the first holding portion 17j. The first holding portion 17j is disposed in the disposition recess 21. Specifically, the first holding portion 17j is disposed on the inner peripheral side of the large diameter portion 21b.

[0044] The shaft member 18 has a cylindrical tube 22 and a spherical bead (ball) 23 fixed to one end of the tube 22. The shaft member 18 of the present embodiment is composed of one tube 22 and one bead 23. The tube 22 and the bead 23 are formed of a metal material. In the present embodiment, the tube 22 and the bead 23 are formed of the same metal material. For example, the tube 22 and the bead 23 are made of stainless steel.

[0045] The tube 22 is, for example, a tube used as an injection needle, and the tube 22 is tapered. In addition, the bead 23 is, for example, a bead used in a small bearing, and the bead 23 is small. That is, the shaft member 18 is tapered as a whole. For example, the outer diameter of the tube 22 is about 0.5 to 0.7 (mm). The outer diameter of the bead 23 is larger than the inner diameter of the tube 22. In addition, the outer diameter of the bead 23 is smaller than the outer diameter of the tube 22. In addition, the outer diameter of the bead 23 can be equal to the outer diameter of the tube 22.

[0046] The bead 23 is fixed to the front end of the tube 22. In addition, the bead 23 is welded and fixed to the front end of the tube 22. The bead 23 is, for example, welded to the front end of the tube 22 at two positions in the circumferential direction of the tube 22. In the manufacturing process of the shaft member 18, a bead fixing process of fixing the bead 23 to the front end (one end) of the tube 22 is included, and in the bead fixing process, the bead 23 is temporarily fixed to the front end of the tube 22 in a state in which air on the inner peripheral side of the tube 22 is sucked from the base end (the other end) of the tube 22, and the bead 23 is formally fixed to the front end of the tube 22 by welding.

[0047] A part of the bead 23 constitutes a front end portion of the shaft member 18. Specifically, a hemispherical portion of the bead 23 disposed on the front end side of the shaft member 18 constitutes the front end portion of the shaft member 18, and the front end portion of the shaft member 18 is formed in a hemispherical shape. That is, the face on the front end side of the shaft member 18 is in a spherical shape (specifically, a hemispherical shape).

[0048] The shaft member 18 is arranged in a manner that its axial direction (i.e., the axial direction of the tube 22) coincides with the front-rear direction. That is, the axial direction of the shaft member 18 coincides with the front-rear direction and is orthogonal to the up-down direction. In the present embodiment, the axial center of the shaft member 18 (i.e., the axial center of the tube 22) coincides with the normal line L2. The up-down direction (Z direction) of the present embodiment becomes the first direction, which is the optical axis direction of the light incident on the reflection surface 10a, and the left-right direction (Y direction) becomes the second direction, which is orthogonal to the axial direction of the shaft member 18 (i.e., the front-rear direction) and the first direction (i.e., the up-down direction).

[0049] The front end of the shaft member 18 is arranged on the front side, and the base end of the shaft member 18 is arranged on the rear side. The shaft member 18 is pressed into the shaft holding hole 17g and is fixed to the back surface portion 17c and the shaft holding portion 17d. The front end side portion of the shaft member 18 protrudes further to the front side than the shaft holding portion 17d. The front end side portion of the shaft member 18, which protrudes further to the front side than the shaft holding portion 17d, is arranged on the inner peripheral side of the small diameter portion 21a and the tapered portion 21c of the arrangement recess 21.

[0050] As described above, the reflection portion 13 is arranged on the front side of the back surface portion 17c. In addition, the arrangement recess 21 is recessed from the center of the rear surface of the holder 11 toward the front side, and the shaft member 18 protrudes toward the center side of the reflection portion 13. The bead 23 is arranged on the center side of the reflection portion 13. The contact portion 12b of the fixing plate 12 is in contact with the front end portion of the shaft member 18. That is, the contact portion 12b is in contact with the bead 23. Specifically, the rear surface of the contact portion 12b, which is in a concave curved surface shape, is in contact with the bead 23 from the front side.

[0051] The shaft member 18 is arranged on the inner peripheral side of the stretched coil spring 16. That is, the stretched coil spring 16 is arranged on the outer peripheral side of the shaft member 18 in a manner of surrounding the shaft member 18. More specifically, the second holding portion 17k of the shaft holding portion 17d is arranged on the inner peripheral side of the stretched coil spring 16, and a part of the shaft member 18 is arranged on the inner peripheral side of the stretched coil spring 16. In addition, the stretched coil spring 16 is arranged on the outer peripheral side of the second holding portion 17k in a manner of surrounding the second holding portion 17k. The stretched coil spring 16 of the present embodiment is a tension spring.

[0052] The outer diameter of the front end of the stretched coil spring 16, which is one end of the stretched coil spring 16, is smaller than the outer diameter of the rear end of the stretched coil spring 16, which is the other end of the stretched coil spring 16. That is, the outer diameter of one end of the stretched coil spring 16 arranged on the reflection portion 13 side is smaller than the outer diameter of the other end of the stretched coil spring 16 arranged on the fixing body 14 side. The outer diameter of the stretched coil spring 16 gradually increases toward the rear side.

[0053] The front end portion of the extension coil spring 16 is arranged in the recessed portion 1 le of the holder 11. The front end portion of the extension coil spring 16 is fixed to the rear surface side of the holder 11 by an adhesive filled in the recessed portion 1 le. The rear end portion of the extension coil spring 16 is arranged in the recessed portion 17h of the frame 17. The rear end portion of the extension coil spring 16 is fixed to the front surface side of the back surface portion 17c by an adhesive filled in the recessed portion 17h.

[0054] The extension coil spring 16 exerts a force on the reflecting portion 13 with respect to the fixed body 14 in a direction in which the contact portion 12b contacts the front end portion of the shaft member 18. That is, the extension coil spring 16 exerts a force on the reflecting portion 13 with respect to the fixed body 14 in a direction in which the contact portion 12b contacts the bead 23. Specifically, the extension coil spring 16 exerts a force on the reflecting portion 13 to the rear side. The rear surface of the contact portion 12b, which is formed in a concave curved surface shape, contacts the bead 23 with a prescribed contact pressure. In the present embodiment, when the optical unit 1 is assembled, the front end portion of the extension coil spring 16 is fixed to the rear surface side of the holder 11 on which the fixed plate 12 is fixed, and the rear end portion of the extension coil spring 16 is fixed to the front surface side of the back surface portion 17c, and thereafter, the shaft member 18 is pressed into the shaft holding hole 17g from the rear side of the back surface portion 17c and is moved to the front side, whereby the acting force of the extension coil spring 16 is generated.

[0055] In addition, in the present embodiment, a stopper (omitted from illustration) for limiting the movement of the reflecting portion 13 to the front side is fixed or formed on the front end side of the inner side surface in the left-right direction of the side surface portion 17a of the frame 17, and the movement of the reflecting portion 13 to the front side is limited by the contact of the holder 11 with the stopper. A gap is formed between the portion of the holder 11 that contacts the stopper and the stopper in the front-rear direction, and the gap is narrower than the depth (the depth in the front-rear direction) at which the recessed portion 21 is arranged. Therefore, in the present embodiment, for example, even if the reflecting portion 13 is moved to the front side with respect to the fixed body 14 by an impact applied to the optical unit 1, the bead 23 does not move to the rear end of the recessed portion 21. That is, even if the reflecting portion 13 is moved to the front side with respect to the fixed body 14 by an impact applied to the optical unit 1, the shaft member 18 does not come off the recessed portion 21.

[0056] The driving mechanism 15 includes a first driving mechanism 25 that rotates the reflecting portion 13 in the axial direction with the up-and-down direction as the axis of rotation with respect to the fixed body 14, and a second driving mechanism 26 that rotates the reflecting portion 13 in the axial direction with the left-and-right direction as the axis of rotation with respect to the fixed body 14. In the present embodiment, the front end portion of the shaft member 18 that is contacted by the contact portion 12b becomes the fulcrum of the rotation of the reflecting portion 13 with respect to the fixed body 14. That is, the bead 23 becomes the fulcrum of the rotation of the reflecting portion 13 with respect to the fixed body 14. In addition, the center of the bead 23 becomes the center of rotation of the reflecting portion 13 with respect to the fixed body 14. That is, the center of curvature of the front end portion of the shaft member 18 that is formed in a semispherical shape becomes the center of rotation of the reflecting portion 13 with respect to the fixed body 14.

[0057] The first driving mechanism 25 includes a driving magnet 27 and a driving coil 28 that are arranged opposite to each other in the left-and-right direction, and a magnetic sensor 29 that detects the amount of rotation of the reflecting portion 13 in the axial direction with the up-and-down direction as the axis of rotation with respect to the fixed body 14. The second driving mechanism 26 includes a driving magnet 31 and a driving coil 32 that are arranged opposite to each other in the up-and-down direction, and a magnetic sensor 33 that detects the amount of rotation of the reflecting portion 13 in the axial direction with the left-and-right direction as the axis of rotation with respect to the fixed body 14. The driving magnet 27 of the present embodiment is a first driving magnet, the driving coil 28 is a first driving coil, and the magnetic sensor 29 is a first magnetic sensor. In addition, the driving magnet 31 of the present embodiment is a second driving magnet, the driving coil 32 is a second driving coil, and the magnetic sensor 33 is a second magnetic sensor.

[0058] The driving magnet 27 is formed in a substantially rectangular flat plate shape. The driving magnet 27 is fixed to both sides in the left-and-right direction of the holder 11 in a state of being arranged in the recessed portion 11b of the holder 11. The thickness direction of the driving magnet 27 coincides with the left-and-right direction when the reflecting portion 13 is not rotated with respect to the fixed body 14, and when the reflecting portion 13 is arranged at a prescribed origin position with respect to the fixed body 14. The driving magnet 31 is formed in a rectangular flat plate shape. The driving magnet 31 is fixed to the lower side of the holder 11 in a state of being arranged in the recessed portion 11c of the holder 11. The thickness direction of the driving magnet 31 coincides with the up-and-down direction when the reflecting portion 13 is arranged at the origin position.

[0059] The drive coil 28 is disposed outside the drive magnet 27 in the left-right direction and opposes the drive magnet 27 in the left-right direction. In addition, the drive coil 28 is disposed in the through-hole 17e of the frame 17. The drive coil 32 is disposed below the drive magnet 31 and opposes the drive magnet 31 in the up-down direction. In addition, the drive coil 32 is disposed in the through-hole 17f of the frame 17. The drive coils 28, 32 are mounted on a flexible printed circuit (FPC) 34. The FPC 34 is fixed to the outer side surface and the lower surface of the frame 17 in the left-right direction.

[0060] The drive magnet 27 is magnetized such that the magnetic pole of the front side portion of the drive magnet 27 and the magnetic pole of the rear side portion of the drive magnet 27 are different magnetic poles. That is, the drive magnet 27 is polarized into two poles in the front-rear direction. Specifically, the center of the drive magnet 27 in the front-rear direction when the reflection portion 13 is disposed at the origin position becomes a polarization position (magnetization division line) 27a, and the drive magnet 27 is polarized into two poles with the polarization position 27a as a boundary. That is, the surface of the drive magnet 27 that opposes the drive coil 28 is polarized into two poles with the polarization position 27a as a boundary.

[0061] Similarly, the drive magnet 31 is magnetized such that the magnetic pole of the front side portion of the drive magnet 31 and the magnetic pole of the rear side portion of the drive magnet 31 are different magnetic poles, and the drive magnet 31 is polarized into two poles in the front-rear direction. Specifically, the center of the drive magnet 31 in the front-rear direction when the reflection portion 13 is disposed at the origin position becomes a polarization position (magnetization division line) 31a, and the drive magnet 31 is polarized into two poles with the polarization position 31a as a boundary. That is, the surface of the drive magnet 31 that opposes the drive coil 32 is polarized into two poles with the polarization position 31a as a boundary.

[0062] When the reflection portion 13 is disposed at the origin position, the polarization position 27a of the drive magnet 27 is disposed at the same position as the front end portion of the shaft member 18 in the front-rear direction (see FIG. 2). Figure 7 That is, when the reflection portion 13 is disposed at the origin position, the polarization position 27a of the drive magnet 27 is disposed at the same position as the bead 23 in the front-rear direction. In the present embodiment, when the reflection portion 13 is disposed at the origin position, the polarization position 27a of the drive magnet 27 is disposed at the same position as the center of the bead 23 (i.e., the center of rotation of the reflection portion 13 with respect to the fixed body 14) in the front-rear direction.

[0063] In addition, when the reflection portion 13 is disposed at the origin position, the polarization position 31a of the drive magnet 31 is disposed at the same position as the front end portion of the shaft member 18 in the front-rear direction (see FIG. 2). Figure 7). That is, when the reflection portion 13 is disposed at the origin position, the polarization position 31a of the driving magnet 31 is disposed at the same position as the bead 23 in the front-rear direction. In the present embodiment, when the reflection portion 13 is disposed at the origin position, the polarization position 31a of the driving magnet 31 is disposed at a position on the front side of the center of the bead 23.

[0064] The magnetic sensors 29, 33 are Hall sensors having Hall elements. The magnetic sensor 29 is disposed on the inner peripheral side of the driving coil 28, and is disposed opposite the driving magnet 27 in the left-right direction. Specifically, the magnetic sensor 29 is disposed on the inner peripheral side of one of the two driving coils 28, and is disposed opposite one of the two driving magnets 27 in the left-right direction. The magnetic sensor 33 is disposed on the inner peripheral side of the driving coil 32, and is disposed opposite the driving magnet 31 in the up-down direction. The magnetic sensors 29, 33 are mounted on the FPC 34.

[0065] When the reflection portion 13 is disposed at the origin position, the magnetic sensor 29 opposes the central portion of the driving magnet 27, and the center of the magnetic sensing surface of the magnetic sensor 29 in the front-rear direction is disposed at the same position as the polarization position 27a of the driving magnet 27 in the front-rear direction. Also, when the reflection portion 13 is disposed at the origin position, the magnetic sensor 33 opposes the central portion of the driving magnet 31, and the center of the magnetic sensing surface of the magnetic sensor 33 in the front-rear direction is disposed at the same position as the polarization position 31a of the driving magnet 31 in the front-rear direction.

[0066] (Main effects of the present embodiment)

[0067] As described above, in the present embodiment, the front end portion of the shaft member 18 formed in a semispherical shape becomes the fulcrum of the rotation of the reflection portion 13 with respect to the fixed body 14. Therefore, in the present embodiment, it is possible to reduce the number of components that constitute the rotation fulcrum of the reflection portion 13 with respect to the fixed body 14. Also, in the present embodiment, the disposition recess 21 in which a portion of the shaft member 18 that protrudes toward the central side of the reflection portion 13 is disposed is formed in the reflection portion 13, a contact portion 12b that contacts the front end portion of the shaft member 18 is formed in the disposition recess 21, and the front end portion of the shaft member 18 becomes the fulcrum of the rotation of the reflection portion 13 with respect to the fixed body 14. Therefore, in the present embodiment, it is possible to bring the rotation fulcrum of the reflection portion 13 with respect to the fixed body 14 close to the center of gravity of the reflection portion 13. Therefore, in the present embodiment, it is possible to smoothly rotate the reflection portion 13 with respect to the fixed body 14.

[0068] In the present embodiment, the tension coil spring 16 exerts a force on the reflecting portion 13 with respect to the fixed body 14 in a direction in which the contact portion 12b contacts the front end portion of the shaft member 18. Therefore, in the present embodiment, the reflecting portion 13 can be returned to the prescribed home position with respect to the fixed body 14 by the force of the tension coil spring 16 when the driving force of the driving mechanism 15 is not acting.

[0069] In the present embodiment, when the reflecting portion 13 is not rotated with respect to the fixed body 14, and the reflecting portion 13 is disposed at the prescribed home position with respect to the fixed body 14, the polarization position 27a of the driving magnet 27 is disposed at the same position as the front end portion of the shaft member 18 in the front-rear direction. Also, in the present embodiment, when the reflecting portion 13 is disposed at the home position, the magnetic sensor 29 opposes the central portion of the driving magnet 27, and the center of the magnetic sensing surface of the magnetic sensor 29 in the front-rear direction is disposed at the same position as the polarization position 27a of the driving magnet 27 in the front-rear direction. Therefore, in the present embodiment, the variation in the output signal of the magnetic sensor 29 when the reflecting portion 13 is rotated with respect to the fixed body 14 from the home position with the left-right direction as the rotational axis can be suppressed. Therefore, in the present embodiment, the detection accuracy of the magnetic sensor 29 with respect to the amount of rotation of the reflecting portion 13 can be improved.

[0070] Likewise, in the present embodiment, when the reflecting portion 13 is disposed at the home position, the polarization position 31a of the driving magnet 31 is disposed at the same position as the front end portion of the shaft member 18 in the front-rear direction, and the magnetic sensor 33 opposes the central portion of the driving magnet 31, and the center of the magnetic sensing surface of the magnetic sensor 33 in the front-rear direction is disposed at the same position as the polarization position 31a of the driving magnet 31 in the front-rear direction. Therefore, in the present embodiment, the variation in the output signal of the magnetic sensor 33 when the reflecting portion 13 is rotated with respect to the fixed body 14 from the home position with the up-down direction as the rotational axis can be suppressed. Therefore, in the present embodiment, the detection accuracy of the magnetic sensor 33 with respect to the amount of rotation of the reflecting portion 13 can be improved.

[0071] In the present embodiment, the tension coil spring 16 is disposed on the outer periphery side of the shaft member 18 in a manner surrounding the shaft member 18. Therefore, in the present embodiment, the distance between the point of action of the tension coil spring 16 on the reflecting portion 13 and the rotational fulcrum of the reflecting portion 13 (i.e., the front end portion of the shaft member 18) in the up-down direction and the left-right direction can be shortened. Therefore, in the present embodiment, the driving force of the reflecting portion 13 in the rotational direction with the up-down direction as the rotational axis and the driving force of the reflecting portion 13 in the rotational direction with the left-right direction as the rotational axis can be suppressed from decreasing due to the force of the tension coil spring 16.

[0072] In the present embodiment, the outer diameter of the front end of the tension coil spring 16 disposed on the side of the reflecting portion 13 is smaller than the outer diameter of the rear end of the tension coil spring 16 disposed on the side of the fixed body 14. Therefore, in the present embodiment, interference between the reflecting portion 13 and the tension coil spring 16 when the reflecting portion 13 is pivoted about the front end portion of the shaft member 18 relative to the fixed body 14 can be prevented.

[0073] In the present embodiment, the shaft member 18 is composed of the tube 22 and the bead 23 fixed to the front end of the tube 22. Therefore, in the present embodiment, even if the shaft member 18 is thinned, the bead 23 can be positioned with the center of the bead 23 disposed on the axis of the shaft member 18 using the inner peripheral side of the front end face of the tube 22. Therefore, in the present embodiment, even if the shaft member 18 is thinned, the center of the bead 23 can be easily disposed on the axis of the shaft member 18.

[0074] In addition, in the present embodiment, in a bead fixing process of fixing the bead 23 to the front end of the tube 22, the bead 23 is temporarily fixed to the front end of the tube 22 in a state where air on the inner peripheral side of the tube 22 is sucked from the base end of the tube 22, and the bead 23 is fixed to the front end of the tube 22 by welding, so even if the shaft member 18 is thinned, the tube 22 is thinned and the bead 23 is small, the fixing work of the bead 23 can be easily performed without causing difficulty in handling the tube 22 and the bead 23.

[0075] (Other Embodiments)

[0076] The above-described embodiment is an example of a preferred embodiment of the present application, but is not limited thereto, and various modifications can be made within the scope of the gist of the present application.

[0077] In the above-described embodiment, the outer diameter of the tension coil spring 16 can be constant. In addition, in the above-described embodiment, the optical unit 1 can be provided with a spring member other than the tension coil spring 16 instead of the tension coil spring 16. For example, the optical unit 1 can be provided with a leaf spring. In this case, the leaf spring is provided with, for example, a ring-shaped fixed portion fixed to the holder 11, a ring-shaped fixed portion fixed to the back face portion 17c of the frame 17, and a plurality of spring portions in a circular arc shape connecting the two fixed portions. This leaf spring is a tension spring that exerts a force on the reflecting portion 13 relative to the fixed body 14 in a direction in which the contact portion 12b contacts the front end portion of the shaft member 18.

[0078] The plate spring is arranged on the outer periphery side of the shaft member 18 in a manner of surrounding the shaft member 18. Specifically, the plate spring is arranged on the outer periphery side of the second holding portion 17k in a manner of surrounding the second holding portion 17k. In the case where the plate spring is provided instead of the stretched coil spring 16, the optical unit 1 can be downsized in the front-rear direction. In addition, in the case where the plate spring is provided instead of the stretched coil spring 16, the movement of the reflecting portion 13 with respect to the fixed body 14 can be restricted in the rotational direction of the axis direction in which the front-rear direction is the rotational axis direction.

[0079] In the above embodiment, the outer diameter of the bead 23 can be larger than the outer diameter of the tube 22. In addition, in the above embodiment, the tube 22 and the bead 23 can be formed of different materials. Further, in the above embodiment, the bead 23 can be fixed to the front end of the tube 22 with an adhesive. In addition, in the above embodiment, the shaft member 18 can be a single member that is cylindrical with a semispherical front end portion. In this case, the shaft member 18 can be formed separately from the frame 17 as in the above embodiment, or can be formed integrally with the frame 17 in a manner of protruding toward the front side from the back portion 17c. In addition, in the above embodiment, the reflecting portion 13 can not be provided with the fixed plate 12. In this case, a contact portion that contacts the front end portion of the shaft member 18 is formed inside the retainer 11.

[0080] In the above embodiment, when the reflecting portion 13 is arranged at the origin position, the polarization position 27a of the driving magnet 27 can be arranged at a position that is offset from the front end portion of the shaft member 18 in the front-rear direction. In addition, in the above embodiment, when the reflecting portion 13 is arranged at the origin position, the polarization position 31a of the driving magnet 31 can be arranged at a position that is offset from the front end portion of the shaft member 18 in the front-rear direction.

[0081] In the above embodiment, the driving mechanism 15 can be provided with a third driving mechanism that rotates the reflecting portion 13 with respect to the fixed body 14 in the axis direction in which the front-rear direction is the rotational axis direction. In this case, for example, the third driving mechanism is provided with driving magnets and driving coils that are opposed in the left-right direction, the driving magnets being magnetized such that the magnetic poles of the upper portion and the lower portion of the driving magnets are different. In addition, in the above embodiment, the driving mechanism 15 can not be provided with the first driving mechanism 25 or the second driving mechanism 26.

[0082] In the above embodiment, the entire shaft member 18 can be arranged in the arrangement recess 21. In addition, in the above embodiment, the shaft member 18 can be arranged such that the axis direction of the shaft member 18 (i.e., the axis direction of the tube 22) coincides with the up-down direction. In this case, for example, the axis of the shaft member 18 coincides with the optical axis LI of the lens 4. In addition, in the above embodiment, the optical unit 1 can be provided with a mirror that is formed with a reflecting surface that reflects light that is incident from the outside, instead of the prism 10.

[0083] Symbol explanation

[0084] 1 optical unit (optical unit with shake correction function)

[0085] 10 prism (reflecting member)

[0086] 10a reflecting surface

[0087] 12b contact portion

[0088] 13 reflecting portion

[0089] 14 fixing body

[0090] 15 driving mechanism

[0091] 16 extension coil spring (spring member, extension spring)

[0092] 18 shaft member

[0093] 21 configuration recess

[0094] 22 tube

[0095] 23 bead

[0096] 25 first driving mechanism

[0097] 26 second driving mechanism

[0098] 27 driving magnet (first driving magnet)

[0099] 27a polarization position (polarization position of the first driving magnet)

[0100] 28 driving coil (first driving coil)

[0101] 29 magnetic sensor (first magnetic sensor)

[0102] 31 driving magnet (second driving magnet)

[0103] 31a polarization position (polarization position of the second driving magnet)

[0104] 32 driving coil (second driving coil)

[0105] 33 magnetic sensor (second magnetic sensor)

[0106] X axial direction of the shaft member

[0107] Y second direction

[0108] Z first direction

Claims

1. An optical unit with jitter correction function, characterized in that, have: The reflective portion has a reflective component that has a reflective surface that reflects light incident from the outside; A fixing body that holds the reflective part; A drive mechanism for rotating the reflector relative to the stationary body; as well as A spring component that applies force to the reflector. The fixing body includes a shaft component that protrudes toward the center side of the reflective part. The front end of the shaft component is formed into a hemispherical shape. The reflective portion has a recessed area for arranging at least a portion of the shaft component. A contact portion that contacts the front end of the shaft component is formed in the recessed area. The spring component applies force to the reflective portion relative to the fixed body in the direction in which the contact portion contacts the front end of the shaft component. The front end of the shaft component becomes the pivot point for the rotation of the reflector relative to the fixed body.

2. The optical unit with jitter correction function according to claim 1, characterized in that, The axial direction of the shaft component is orthogonal to the optical axis direction of the light incident on the reflecting surface, i.e., the first direction.

3. The optical unit with jitter correction function according to claim 2, characterized in that, The driving mechanism includes: a first driving mechanism that rotates the reflective portion relative to the fixed body with the first direction as the axis of rotation; and a second driving mechanism that rotates the reflective portion relative to the fixed body with the second direction orthogonal to the axis of rotation of the shaft member and the first direction as the axis of rotation.

4. The optical unit with jitter correction function according to claim 3, characterized in that, The first driving mechanism includes: a first driving magnet and a first driving coil arranged opposite to each other in the second direction; and a first magnetic sensor for detecting the amount of rotation of the reflector relative to the stationary body in a rotational direction with the first direction as the axis of rotation. The second drive mechanism includes: a second drive magnet and a second drive coil arranged opposite to each other in the first direction; and a second magnetic sensor for detecting the amount of rotation of the reflector relative to the stationary body in a rotational direction with the second direction as the axis of rotation. The first magnetic sensor is configured opposite to the first driving magnet in the second direction. The second magnetic sensor is configured opposite to the second driving magnet in the first direction. The first driving magnet and the second driving magnet are polarized into two poles along the axial direction of the shaft component. When the reflective part is positioned at a predetermined origin relative to the fixed body, at least one of the polarization positions of the first driving magnet and the second driving magnet is positioned axially in the same position as the front end of the shaft member.

5. The optical unit with jitter correction function according to claim 3 or 4, characterized in that, The spring component is a tension spring.

6. The optical unit with jitter correction function according to claim 5, characterized in that, The tension spring is a tension helical spring. The shaft component is disposed on the inner circumference side of the tension coil spring.

7. The optical unit with jitter correction function according to claim 6, characterized in that, The outer diameter of one end of the tension coil spring disposed on the reflector side is smaller than the outer diameter of the other end of the tension coil spring disposed on the fixing body side.

8. The optical unit with jitter correction function according to any one of claims 1 to 7, characterized in that, The shaft component comprises a cylindrical tube and a spherical bead fixed to the front end of the tube. The outer diameter of the bead is larger than the inner diameter of the tube. A portion of the bead forms the front end of the shaft component.

Images