JP2023018512A - Optical unit with shake correction function - Google Patents

Abstract

To provide an optical unit with shake correction function which is equipped with a fixation body for swingably holding a reflection part that reflects incident light from the outside, with which it is possible to bring the fulcrum of swinging motion of the reflection part relative to the fixation body closer to the center of gravity of the reflection part while reducing parts counts constituting the fulcrum of swinging motion of the reflection part relative to the fixation body.SOLUTION: In an optical unit 1 with a shake correction function, a fixation body 14 for holding a reflection part 13 is equipped with a shaft member 18 that projects toward the center side of the reflection part 13. A locating recess 21 is formed in the reflection part 13, in which a portion of the shaft member 18 is located, and a contact part 12b that contacts the tip of the shaft member 18 is formed in the locating recess 21. A spring member 16 for urging the reflection part 13 urges the reflection part 13 in a direction in which the contact part 12b contacts the tip of the shaft member 18, with the tip of the shaft member 18 that is formed in a semispherical shape serving as the fulcrum of swinging motion of the reflection part 13 relative to the fixation part 14.SELECTED DRAWING: Figure 5

Description

The present invention relates to an optical unit with a shake correction function that has a shake correction function for correcting shake of an optical image.

2. Description of the Related Art Conventionally, there is known a camera module having a shake correction function for correcting shake of an optical image (see Patent Document 1, for example). A camera module disclosed in Patent Document 1 includes a reflection module, a lens module, and an image sensor module arranged in a housing. The reflective module includes a reflective member that reflects light and a rotating holder to which the reflective member is fixed. The reflector module also includes a first ball, a pivot plate and a second ball. The first ball is positioned between the wall of the housing and the pivot plate. The first balls are arranged at two locations with an interval in the X-axis direction. The second ball is arranged between the pivot plate and the pivot holder. The second balls are arranged at two locations with an interval in the Y-axis direction.

In the camera module disclosed in Patent Literature 1, the magnetic attraction acting between the permanent magnet attached to the rotating holder and the yoke attached to the wall surface of the housing causes the first ball to move toward the wall surface of the housing and rotate. The second ball is in contact with the plate with a predetermined contact pressure, and the second ball is in contact with the rotating plate and the rotating holder with a predetermined contact pressure. In this camera module, the reflecting member is rotatable with respect to the wall surface of the housing together with the rotating plate and the rotating holder, with the two first balls as fulcrums and the X-axis direction as the axial direction of rotation. there is In addition, the reflecting member is rotatable together with the rotating holder with respect to the rotating plate, with the two second balls as fulcrums and the Y-axis direction as the axial direction of rotation. In this camera module, the shaking of the optical image is corrected by rotating the reflecting member with the X-axis direction and the Y-axis direction as rotation axis directions.

U.S. Patent Application Publication No. 2018/0224665

In the camera module described in Patent Document 1, the first ball arranged between the wall surface of the housing and the rotating plate serves as a fulcrum for rotating the reflecting member with the X-axis direction as the axial direction of rotation. . Further, in this camera module, the second ball disposed between the rotating plate and the rotating holder serves as a fulcrum for rotating the reflecting member with the Y-axis direction as the axial direction of rotation. Therefore, in this camera module, the fulcrum of rotation of the reflecting member and the rotating holder that rotates with respect to the housing is arranged at a position away from the center of the reflecting member and the rotating holder. It is located away from the center of gravity of the holder.

Therefore, in the camera module disclosed in Patent Document 1, it may be difficult to smoothly rotate the reflecting member fixed to the rotating holder with respect to the housing. Further, in this camera module, the two first balls and the two second balls constitute the fulcrum of rotation of the reflecting member and the rotating holder with respect to the housing. The number of parts constituting the fulcrum of rotation is increased.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an optical unit with a shake correction function that includes a reflecting section having a reflecting member formed with a reflecting surface that reflects incident light from the outside, and a fixed body that rotatably holds the reflecting section. 2, an optical unit with a shake correction function capable of bringing the fulcrum of rotation of the reflector relative to the fixed body closer to the center of gravity of the reflector while reducing the number of parts constituting the fulcrum of rotation of the reflector relative to the fixed body. is to provide

In order to solve the above-described problems, an optical unit with a shake correction function of the present invention includes: a reflecting section having a reflecting member formed with a reflecting surface that reflects light incident from the outside; a fixed body that holds the reflecting section; a driving mechanism for rotating the reflecting part with respect to the fixed body; and a spring member for biasing the reflecting part. The tip of the shaft member is formed in a hemispherical shape, the reflecting part is formed with an arrangement recess in which at least a part of the shaft member is arranged, and the arrangement recess has a contact part that contacts the tip of the shaft member. The spring member urges the reflecting portion against the fixed body in a direction in which the contact portion contacts the distal end portion of the shaft member, and the distal end portion of the shaft member serves as a fulcrum of rotation of the reflecting portion with respect to the fixed body. It is characterized by

In the optical unit with a shake correction function of the present invention, the fixed body has a shaft member protruding toward the center of the reflecting section, and the distal end of the shaft member formed in a hemispherical shape is a portion of the reflecting section with respect to the fixed body. It is the fulcrum of rotation. Therefore, according to the present invention, it is possible to reduce the number of parts constituting the fulcrum of rotation of the reflecting section with respect to the fixed body. Further, in the present invention, the reflecting portion is formed with an arrangement recess in which at least a portion of the shaft member projecting toward the center of the reflecting portion is arranged, and the contact portion that contacts the tip portion of the shaft member is provided in the arrangement recess. A portion is formed, and the tip of the shaft member serves as a fulcrum of rotation of the reflecting portion with respect to the fixed body. Therefore, in the present invention, it is possible to bring the fulcrum of rotation of the reflecting section with respect to the fixed body closer to the center of gravity of the reflecting section.

Further, in the present invention, the spring member urges the reflecting portion against the fixed body in the direction in which the contact portion contacts the distal end portion of the shaft member. Therefore, when the driving force of the driving mechanism does not act, , the urging force of the spring member enables the reflector to return to the predetermined origin position with respect to the fixed body. Note that in the camera module described in Patent Document 1, the reflecting member cannot be returned to the predetermined origin position with respect to the housing when the driving force for rotating the reflecting member is not acting.

In the present invention, for example, the axial direction of the shaft member is orthogonal to the first direction, which is the optical axis direction of light incident on the reflecting surface. In this case, compared to the case where the axial direction of the shaft member is parallel to the first direction, it is possible to reduce the size of the optical unit with a shake correction function in the optical axis direction of the light incident on the reflecting surface. become.

In the present invention, for example, the drive mechanism includes a first drive mechanism that rotates the reflecting portion with respect to the fixed body with the first direction being the axial direction of rotation, and an axial direction of the shaft member that is orthogonal to the first direction. and a second drive mechanism that rotates the reflecting portion with respect to the fixed body with the second direction as the axial direction of rotation.

In the present invention, the first drive mechanism includes a first drive magnet and a first drive coil that are arranged to face each other in the second direction, and the first drive mechanism rotates in the rotation direction with the first direction as the rotation axis direction. a first magnetic sensor for detecting the amount of rotation of the portion, and the second drive mechanism includes a second drive magnet and a second drive coil that are arranged to face each other in the first direction, and rotates in the second direction. a second magnetic sensor for detecting the amount of rotation of the reflecting portion with respect to the fixed body in a rotation direction that is the axial direction of the first magnetic sensor, the first magnetic sensor is disposed facing the first driving magnet in the second direction, The second magnetic sensor is arranged to face the second driving magnet in the first direction, and the first driving magnet and the second driving magnet are polarized into two poles in the axial direction of the shaft member. On the other hand, when the reflecting portion is arranged at the predetermined origin position, at least one of the polarization position of the first driving magnet and the polarization position of the second driving magnet is aligned with the shaft member in the axial direction of the shaft member. is preferably arranged at the same position as the tip of the

With this configuration, when the reflecting portion rotates from the origin position with respect to the fixed body with the second direction as the axial direction of rotation, the output signal of the first magnetic sensor changes and the rotation in the first direction occurs. It is possible to suppress at least one of the fluctuations of the output signal of the second magnetic sensor when the reflector rotates from the origin position with respect to the fixed body in the axial direction of . Therefore, it is possible to improve at least one of the detection accuracy of the amount of rotation of the reflecting section by the first magnetic sensor and the accuracy of detecting the amount of rotation of the reflecting section by the second magnetic sensor.

In the present invention, the spring member is, for example, a tension spring. In this case, it is preferable that the tension spring is a tension coil spring and the shaft member is arranged on the inner peripheral side of the tension coil spring. With this configuration, the distance in the first direction between the point of action of the tension coil spring on the reflecting section and the fulcrum of rotation of the reflecting section (that is, the tip of the shaft member), and the point of action of the tension coil spring on the reflecting section. It is possible to shorten the distance in the second direction from the fulcrum of rotation of the reflecting section. Therefore, the driving force of the reflecting portion in the rotating direction with the first direction being the axial direction of rotation and the driving force of the reflecting portion in the rotating direction with the second direction being the axial direction of rotation are combined with the biasing force of the extension coil spring. It is possible to suppress the decrease due to the influence of

In the present invention, it is preferable that the outer diameter of one end of the extension coil spring arranged on the reflector side is smaller than the outer diameter of the other end of the extension coil spring arranged on the fixed body side. With this configuration, it is possible to prevent interference between the reflecting section and the extension coil spring when the reflecting section rotates with respect to the fixed body with the distal end portion of the shaft member as a fulcrum.

In the present invention, the shaft member includes a cylindrical pipe and a spherical ball fixed to the tip of the pipe, the outer diameter of the ball being larger than the inner diameter of the pipe, and a part of the ball It is preferable that it constitutes the tip of the shaft member. With this configuration, even if the shaft member is thin, it is possible to position the ball so that the center of the ball is arranged on the axis of the shaft member by using the inner peripheral side of the end face of the pipe. Become. Therefore, even if the shaft member is thin, it is possible to easily arrange the center of the ball on the axis of the shaft member. Also, with this configuration, when fixing the ball to the tip of the pipe, for example, the ball can be temporarily fixed to the tip of the pipe by sucking the air on the inner peripheral side of the pipe from the base end of the pipe. become. Therefore, even if the shaft member becomes thinner, the pipe becomes thinner and the ball becomes smaller, and as a result, it becomes difficult to handle the pipe and the ball, the fixing operation of the ball can be easily performed.

As described above, in the present invention, an optical system with a shake correction function includes a reflecting section having a reflecting member formed with a reflecting surface that reflects light incident from the outside, and a fixed body that rotatably holds the reflecting section. In the unit, it is possible to bring the fulcrum of rotation of the reflector relative to the fixed body closer to the center of gravity of the reflector while reducing the number of parts constituting the fulcrum of rotation of the reflector relative to the fixed body.

1 is a perspective view of an optical unit with a shake correction function according to an embodiment of the present invention; FIG. 2 is a perspective view of a smartphone in which the optical unit with a shake correction function shown in FIG. 1 is built; FIG. 3 is a schematic diagram for explaining the configuration of a camera built into the smartphone shown in FIG. 2; FIG. FIG. 2 is an exploded perspective view of the optical unit with a shake correction function shown in FIG. 1; 2 is a vertical cross-sectional view of the optical unit with a shake correction function shown in FIG. 1; FIG. FIG. 2 is a cross-sectional view of the optical unit with a shake correction function shown in FIG. 1; 5 is a plan view showing the shaft member, the first driving magnet, and the second driving magnet extracted from FIG. 4; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Configuration of optical unit with shake correction function)
FIG. 1 is a perspective view of an optical unit 1 with a shake correction function according to an embodiment of the invention. FIG. 2 is a perspective view of a smart phone 2 in which the optical unit 1 with a shake correction function shown in FIG. 1 is built. FIG. 3 is a schematic diagram for explaining the configuration of the camera 3 incorporated in the smart phone 2 shown in FIG. FIG. 4 is an exploded perspective view of the optical unit 1 with a shake correction function shown in FIG. FIG. 5 is a vertical cross-sectional view of the optical unit 1 with a shake correction function shown in FIG. FIG. 6 is a cross-sectional view of the optical unit 1 with a shake correction function shown in FIG. FIG. 7 is a plan view showing the shaft member 18 and the drive magnets 27 and 31 extracted from FIG.

An optical unit 1 with a shake correction function (hereinafter referred to as "optical unit 1") of this embodiment has a shake correction function for correcting shake of an optical image. The optical unit 1 is, for example, a small unit built into a smart phone 2 (see FIG. 2). The optical unit 1 constitutes a part of the camera 3 (see FIG. 3) built into the smart phone 2 . Note that the optical unit 1 may be built in a mobile device or the like other than the smart phone 2 .

As shown in FIG. 3, the camera 3 includes a lens 4 into which light from the outside of the smartphone 2 is incident, and a substrate 6 on which an imaging device 5 is mounted. The optical axis L1 of the lens 4 and the normal line L2 passing through the center of the imaging surface of the imaging device 5 are orthogonal. The optical unit 1 is arranged between the lens 4 and the image sensor 5 on the optical path from the lens 4 to the image sensor 5 . A lens 7 is arranged between the optical unit 1 and the imaging device 5 . The optical axis of lens 7 coincides with normal L2.

The optical unit 1 includes a prism 10 as a reflecting member having a reflecting surface 10a for reflecting light incident from the outside. Light passing through the lens 4 is incident on the reflecting surface 10a. The reflective surface 10 a reflects light incident on the reflective surface 10 a through the lens 4 toward the imaging device 5 . The reflecting surface 10a bends the optical axis of light incident on the reflecting surface 10a by approximately 90°. The light reflected by the reflecting surface 10a passes through the lens 7, and the light passing through the lens 7 enters the imaging device 5. As shown in FIG.

In the following description, the direction of the optical axis of light incident on the reflecting surface 10a (that is, the direction of the optical axis L1 of the lens 4, the Z direction in FIG. (X direction in FIG. 1 and the like) is defined as the front-rear direction, and the Y direction in FIG. Also, in the vertical direction, the side on which the lens 4 is arranged with respect to the optical unit 1 (the Z1 direction side in FIG. 1 etc.) is defined as the "upper" side, and the Z2 direction side in FIG. "bottom" side. In the front-rear direction, the side on which the imaging element 5 is arranged with respect to the optical unit 1 (the X1 direction side in FIG. 1 etc.) is defined as the "front" side, and the opposite side, the X2 direction side in FIG. is the "back" side.

The optical unit 1 includes a prism 10 , a holder 11 to which the prism 10 is fixed, and a fixing plate 12 fixed to the holder 11 . In this embodiment, the prism 10, the holder 11, the fixing plate 12, and the like constitute the reflector 13. As shown in FIG. That is, the optical unit 1 includes a reflector 13 having a prism 10, a holder 11, a fixing plate 12, and the like. The optical unit 1 also includes a fixed body 14 that holds the reflecting part 13 , a drive mechanism 15 that rotates the reflecting part 13 with respect to the fixed body 14 , and a tension member that acts as a spring member that biases the reflecting part 13 . A coil spring 16 is provided. The fixed body 14 has a frame 17 and a shaft member 18 fixed to the frame 17 . The optical unit 1 corrects the shake of the optical image by rotating the reflecting portion 13 with respect to the fixed body 14 .

The holder 11 is made of a resin material. The holder 11 is formed with an inclined surface 11a to which the prism 10 is fixed (see FIG. 5). The inclined surface 11a is inclined downward toward the front side. The inclined surface 11 a is formed between the front lower end portion and the rear upper end portion of the holder 11 . A rear surface of the holder 11 is a flat surface substantially orthogonal to the front-rear direction. Both side surfaces of the holder 11 in the left-right direction are formed with recesses 11b in which drive magnets 27 (to be described later) constituting the drive mechanism 15 are arranged. The recess 11b is recessed inward in the left-right direction. The lower surface of the holder 11 is formed with a recess 11c in which a drive magnet 31, which will be described later and which constitutes the drive mechanism 15, is arranged. The concave portion 11c is recessed upward.

A through hole 11d is formed in the holder 11 so as to pass through the holder 11 in the front-rear direction. A rear end opening of the through hole 11 d is formed at the center of the rear surface of the holder 11 . The rear surface of the holder 11 is formed with an annular recess 11e. The concave portion 11e is recessed toward the front side. The recess 11e is formed in an annular shape surrounding the rear end opening of the through hole 11d. A front end portion of the through hole 11 d is closed by a fixing plate 12 . In this embodiment, the fixing plate 12 and the portion of the through-hole 11 d behind the fixing plate 12 form an arrangement recess 21 in which a portion of the shaft member 18 is arranged. That is, the reflecting portion 13 is formed with an arrangement concave portion 21 in which a portion of the shaft member 18 is arranged.

The placement recess 21 has a small-diameter portion 21a forming the front end of the placement recess 21, a large-diameter portion 21b forming the rear end of the placement recess 21, and between the small-diameter portion 21a and the large-diameter portion 21b in the front-rear direction. It is composed of a tapered portion 21c arranged. 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 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.

The fixed plate 12 is made of a metal material. For example, the fixed plate 12 is made of stainless steel. The fixing plate 12 is composed of an annular flat plate-like fixed portion 12a fixed to the holder 11, and a curved plate-like contact portion 12b connected to the inner peripheral end of the fixed portion 12a. The fixed portion 12a is fixed to the holder 11 so that the thickness direction of the fixed portion 12a substantially coincides with the front-rear direction. The contact portion 12b is formed in a substantially hemispherical shape that bulges forward, and the rear surface of the contact portion 12b is a concave curved surface that dents forward. Specifically, the rear surface of the contact portion 12b is a hemispherical concave curved surface. The tip portion of the shaft member 18 is in contact with the contact portion 12b. In other words, a contact portion 12b with which the tip portion of the shaft member 18 contacts is formed in the placement recess 21. As shown in FIG.

The fixed body 14 includes the frame 17 and the shaft member 18 as described above. The frame 17 is made of resin material. The frame 17 has two flat plate-like side portions 17a that form the lateral sides of the frame 17, a flat plate-like bottom portion 17b that forms the bottom surface (lower surface) of the frame 17, and a rear surface of the frame 17. It is provided with a flat plate-shaped rear portion 17c and a shaft holding portion 17d projecting forward from the rear portion 17c. The reflecting portion 13 is arranged between the two side portions 17a in the left-right direction. The reflecting portion 13 is arranged above the bottom surface portion 17b and in front of the rear surface portion 17c.

A through hole 17e for arranging a driving coil 28, which will be described later, which constitutes the driving mechanism 15, is formed in the side surface portion 17a. A through hole 17f for arranging a driving coil 32, which will be described later, and which constitutes the driving mechanism 15, is formed in the bottom portion 17b. The shaft holding portion 17d protrudes forward from the center of the back portion 17c. The shaft holding portion 17d is formed in a substantially cylindrical shape, and a shaft holding hole 17g is formed through the shaft holding portion 17d and the back surface portion 17c in the front-rear direction. The shaft holding hole 17g is a round hole with a constant inner diameter. An annular concave portion 17h is formed in the front surface of the back surface portion 17c. The recessed portion 17h is recessed toward the rear side. The concave portion 17h is formed in an annular shape surrounding the shaft holding portion 17d.

The shaft holding portion 17d is composed of a first holding portion 17j forming a front portion of the shaft holding portion 17d and a second holding portion 17k forming a rear 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 arranged in the arrangement recess 21. As shown in FIG. Specifically, the first holding portion 17j is arranged on the inner peripheral side of the large diameter portion 21b.

The shaft member 18 includes a cylindrical pipe 22 and a spherical ball (sphere) 23 fixed to one end of the pipe 22 . The shaft member 18 of this embodiment is composed of one pipe 22 and one ball 23 . Pipe 22 and ball 23 are made of a metal material. In this embodiment, the pipe 22 and the ball 23 are made of the same metal material. For example, pipe 22 and ball 23 are made of stainless steel.

The pipe 22 is used, for example, as an injection needle, and the pipe 22 is narrowed. Also, the balls 23 are used, for example, in miniature bearings, and the balls 23 are small. That is, the shaft member 18 is thin as a whole. For example, the outer diameter of the pipe 22 is approximately 0.5 to 0.7 (mm). The outer diameter of the ball 23 is larger than the inner diameter of the pipe 22 . Also, the outer diameter of the ball 23 is smaller than the outer diameter of the pipe 22 . Note that the outer diameter of the ball 23 may be equal to the outer diameter of the pipe 22 .

Ball 23 is fixed to the tip of pipe 22 . Also, the ball 23 is welded and fixed to the tip of the pipe 22 . The ball 23 is welded to the tip of the pipe 22 at, for example, two points in the circumferential direction of the pipe 22 . The manufacturing process of the shaft member 18 includes a ball fixing process for fixing the ball 23 to the tip (one end) of the pipe 22 . After the ball 23 is temporarily fixed to the tip of the pipe 22 by suction from the end (the other end), the ball 23 is permanently fixed to the tip of the pipe 22 by welding.

A portion of the ball 23 constitutes the tip of the shaft member 18 . Specifically, the hemispherical portion of the ball 23 disposed on the distal end side of the shaft member 18 constitutes the distal end portion of the shaft member 18, and the distal end portion of the shaft member 18 is formed in a hemispherical shape. there is That is, the tip side surface of the shaft member 18 is spherical (specifically, hemispherical).

The shaft member 18 is arranged so that the axial direction of the shaft member 18 (that is, the axial direction of the pipe 22) is aligned with the front-rear direction. That is, the axial direction of the shaft member 18 coincides with the front-rear direction and is perpendicular to the vertical direction. In this embodiment, the axial center of the shaft member 18 (that is, the axial center of the pipe 22) coincides with the normal line L2. The vertical direction (Z direction) of this embodiment is the first direction, which is the optical axis direction of light incident on the reflecting surface 10a, and the horizontal direction (Y direction) is the longitudinal direction, which is the axial direction of the shaft member 18. and the vertical direction, which is the first direction.

The distal end of the shaft member 18 is arranged on the front side, and the proximal end of the shaft member 18 is arranged on the rear side. The shaft member 18 is press-fitted into the shaft holding hole 17g and fixed to the back surface portion 17c and the shaft holding portion 17d. The tip side portion of the shaft member 18 protrudes forward from the shaft holding portion 17d. The distal end portion of the shaft member 18 that projects forward beyond the shaft holding portion 17 d is arranged on the inner peripheral side of the small diameter portion 21 a and the tapered portion 21 c of the arrangement recess 21 .

As described above, the reflecting portion 13 is arranged on the front side of the back portion 17c. Further, the placement recessed portion 21 is recessed forward from the center of the rear surface of the holder 11 , and the shaft member 18 protrudes toward the center of the reflecting portion 13 . The ball 23 is arranged on the center side of the reflecting section 13 . The contact portion 12 b of the fixed plate 12 is in contact with the tip portion of the shaft member 18 . That is, the ball 23 is in contact with the contact portion 12b. Specifically, the rear surface of the concave curved contact portion 12b contacts the ball 23 from the front side.

The shaft member 18 is arranged on the inner peripheral side of the tension coil spring 16 . That is, the tension coil spring 16 is arranged on the outer peripheral side of the shaft member 18 so as to surround the shaft member 18 . More specifically, the second holding portion 17 k of the shaft holding portion 17 d is arranged on the inner peripheral side of the tension coil spring 16 , and a part of the shaft member 18 is arranged on the inner peripheral side of the tension coil spring 16 . Also, the tension coil spring 16 is arranged on the outer peripheral side of the second holding portion 17k so as to surround the second holding portion 17k. The tension coil spring 16 of this embodiment is a tension spring.

The outer diameter of the front end of the tension coil spring 16 which is one end of the tension coil spring 16 is smaller than the outer diameter of the rear end of the tension coil spring 16 which is the other end of the tension coil spring 16 . That is, the outer diameter of one end of the extension coil spring 16 arranged on the reflecting portion 13 side is smaller than the outer diameter of the other end of the extension coil spring 16 arranged on the fixed body 14 side. The outer diameter of the tension coil spring 16 gradually increases toward the rear side.

The front end of the tension coil spring 16 is arranged in the recess 11 e of the holder 11 . A front end portion of the tension coil spring 16 is fixed to the rear surface side of the holder 11 by an adhesive filling the concave portion 11e. A rear end portion of the tension coil spring 16 is arranged in a recess 17 h of the frame 17 . The rear end portion of the tension coil spring 16 is fixed to the front side of the back surface portion 17c with an adhesive that fills the recess 17h.

The tension coil spring 16 biases the reflecting portion 13 against the fixed body 14 in the direction in which the contact portion 12b contacts the tip portion of the shaft member 18. As shown in FIG. That is, the tension coil spring 16 biases the reflecting portion 13 against the fixed body 14 in the direction in which the contact portion 12 b contacts the ball 23 . Specifically, the tension coil spring 16 urges the reflector 13 rearward. The rear surface of the concavely curved contact portion 12b contacts the ball 23 with a predetermined contact pressure. In this embodiment, when the optical unit 1 is assembled, the front end portion of the tension coil spring 16 is fixed to the rear surface side of the holder 11 to which the fixing plate 12 is fixed, and the rear end portion of the tension coil spring 16 is fixed to the front surface side of the rear surface portion 17c. After fixing, the urging force of the extension coil spring 16 is generated by pushing the shaft member 18 into the shaft holding hole 17g from the rear side of the back surface portion 17c and moving it forward.

In this embodiment, a stopper (not shown) for restricting the forward movement of the reflecting portion 13 is fixed or formed on the front end side of the lateral inner surface of the side portion 17a of the frame 17. The forward movement of the reflector 13 is restricted 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 this gap is narrower than the depth of the arrangement recess 21 (the depth in the front-rear direction). there is Therefore, in this embodiment, for example, even if an impact is applied to the optical unit 1 and the reflection section 13 moves forward with respect to the fixed body 14 , the ball 23 does not move to the rear end of the arrangement recess 21 . That is, even if an impact is applied to the optical unit 1 and the reflecting portion 13 moves forward with respect to the fixed body 14 , the shaft member 18 does not come off the placement recess 21 .

The driving mechanism 15 includes a first driving mechanism 25 that rotates the reflecting portion 13 with respect to the fixed body 14 with the vertical direction as the axial direction of rotation, and a first driving mechanism 25 that rotates the reflecting portion 13 with respect to the fixed body 14 with the horizontal direction as the axial direction of rotation. and a second drive mechanism 26 that rotates the portion 13 . In this embodiment, the distal end portion of the shaft member 18 with which the contact portion 12 b contacts serves as a fulcrum of rotation of the reflecting portion 13 with respect to the fixed body 14 . That is, the ball 23 serves as a fulcrum of rotation of the reflecting portion 13 with respect to the fixed body 14 . Also, the center of the ball 23 is the center of rotation of the reflecting portion 13 with respect to the fixed body 14 . That is, the center of curvature of the distal end portion of the hemispherical shaft member 18 is the center of rotation of the reflecting portion 13 with respect to the fixed body 14 .

The first driving mechanism 25 includes a driving magnet 27 and a driving coil 28 that are arranged to face each other in the horizontal direction, and controls the amount of rotation of the reflecting portion 13 with respect to the fixed body 14 in the rotation direction with the vertical direction as the rotation axis direction. and a magnetic sensor 29 for sensing. The second driving mechanism 26 controls the amount of rotation of the reflecting portion 13 with respect to the fixed body 14 in the rotation direction with the left-right direction as the rotation axis direction, and the driving magnet 31 and the driving coil 32 that are arranged to face each other in the vertical direction. and a magnetic sensor 33 for sensing. The driving magnet 27 of this 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. Further, the driving magnet 31 of this 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.

The driving magnet 27 is formed in a substantially rectangular flat plate shape. The driving magnets 27 are fixed to both sides of the holder 11 in the left-right direction while being arranged in the concave portion 11b of the holder 11 . When the reflecting portion 13 is not rotated with respect to the fixed body 14 and the reflecting portion 13 is arranged at the predetermined origin position with respect to the fixed body 14, the thickness direction of the drive magnet 27 is the horizontal direction. is consistent with The driving magnet 31 is formed in a rectangular flat plate shape. The drive magnet 31 is fixed to the lower side of the holder 11 while being arranged in the recess 11c of the holder 11 . The thickness direction of the driving magnet 31 coincides with the vertical direction when the reflecting portion 13 is arranged at the origin position.

The drive coil 28 is arranged outside the drive magnet 27 in the left-right direction and faces the drive magnet 27 in the left-right direction. Further, the drive coil 28 is arranged in the through hole 17 e of the frame 17 . The drive coil 32 is arranged below the drive magnet 31 and faces the drive magnet 31 in the vertical direction. Further, the drive coil 32 is arranged in the through hole 17f of the frame 17. As shown in FIG. The drive coils 28 , 32 are mounted on a flexible printed circuit board (FPC) 34 . The FPC 34 is fixed to the lateral outer surface and the lower surface of the frame 17 .

The driving magnet 27 is magnetized such that the magnetic poles of the front portion of the driving magnet 27 and the magnetic poles of the rear portion of the driving magnet 27 are different. That is, the driving magnet 27 is polarized into two poles in the front-rear direction. Specifically, the center of the driving magnet 27 in the front-rear direction when the reflecting portion 13 is arranged at the origin position is the polarization position (magnetization polarization line) 27a, and the driving magnet 27 is positioned at the polarization position It is polarized into two poles with 27a as a boundary. That is, the surface of the driving magnet 27 facing the driving coil 28 is polarized into two poles with the polarization position 27a as a boundary.

Similarly, the driving magnet 31 is magnetized so that the magnetic poles of the front portion of the driving magnet 31 and the magnetic poles of the rear portion of the driving magnet 31 are different. It is polarized in two directions. Specifically, the center of the driving magnet 31 in the front-rear direction when the reflecting portion 13 is arranged at the origin position is the polarization position (magnetization polarization line) 31a, and the driving magnet 31 is positioned at the polarization position It is polarized into two poles with 31a as a boundary. That is, the surface of the driving magnet 31 facing the driving coil 32 is polarized into two poles with the polarization position 31a as a boundary.

When the reflecting portion 13 is arranged at the origin position, the polarization position 27a of the driving magnet 27 is arranged at the same position as the tip portion of the shaft member 18 in the front-rear direction (see FIG. 7). That is, when the reflecting portion 13 is arranged at the origin position, the polarization position 27a of the driving magnet 27 is arranged at the same position as the ball 23 in the front-rear direction. In this embodiment, when the reflecting portion 13 is arranged at the origin position, the polarization position 27a of the driving magnet 27 is positioned at the center of the ball 23 (that is, the rotation center of the reflecting portion 13 with respect to the fixed body 14) in the front-rear direction. ) are placed in the same position as

Further, when the reflecting portion 13 is arranged at the origin position, the polarization position 31a of the driving magnet 31 is arranged at the same position as the tip portion of the shaft member 18 in the front-rear direction (see FIG. 7). That is, when the reflecting portion 13 is arranged at the origin position, the polarization position 31a of the driving magnet 31 is arranged at the same position as the ball 23 in the front-rear direction. In this embodiment, the polarization position 31a of the driving magnet 31 is positioned forward of the center of the ball 23 when the reflecting portion 13 is positioned at the origin position.

The magnetic sensors 29 and 33 are Hall sensors having Hall elements. The magnetic sensor 29 is arranged on the inner peripheral side of the driving coil 28 and is arranged to face the driving magnet 27 in the left-right direction. Specifically, the magnetic sensor 29 is arranged on the inner peripheral side of one of the two drive coils 28 , and is arranged on the inner peripheral side of one of the two drive magnets 27 . It faces the magnet 27 in the left-right direction. The magnetic sensor 33 is arranged on the inner peripheral side of the driving coil 32 and is arranged to face the driving magnet 31 in the vertical direction. Magnetic sensors 29 and 33 are mounted on FPC 34 .

When the reflecting portion 13 is arranged at the origin position, the magnetic sensor 29 faces the center of the driving magnet 27, and the center of the magneto-sensitive surface of the magnetic sensor 29 in the front-rear direction and the polarization of the driving magnet 27 are aligned. The position 27a is arranged at the same position in the front-rear direction. Further, when the reflecting portion 13 is arranged at the origin position, the magnetic sensor 33 faces the center of the driving magnet 31, and the center of the magneto-sensitive surface of the magnetic sensor 33 in the front-rear direction and the driving magnet 31 are aligned. is arranged at the same position in the front-rear direction as the polarization position 31a of .

(Main effects of this form)
As described above, in this embodiment, the distal end portion of the hemispherical shaft member 18 serves as the fulcrum of rotation of the reflecting portion 13 with respect to the fixed body 14 . Therefore, in this embodiment, it is possible to reduce the number of parts that constitute the fulcrum of rotation of the reflecting section 13 with respect to the fixed body 14 . In addition, in the present embodiment, the reflecting portion 13 is formed with an arrangement concave portion 21 in which a portion of the shaft member 18 protruding toward the center side of the reflecting portion 13 is arranged. A contact portion 12 b is formed to contact the portion, and the tip portion of the shaft member 18 serves as a fulcrum of rotation of the reflecting portion 13 with respect to the fixed body 14 . Therefore, in this embodiment, the fulcrum of rotation of the reflecting section 13 with respect to the fixed body 14 can be brought closer to the center of gravity of the reflecting section 13 . Therefore, in this embodiment, it is possible to smoothly rotate the reflecting portion 13 with respect to the fixed body 14 .

In this embodiment, the tension coil spring 16 urges the reflecting portion 13 against the fixed body 14 in the direction in which the contact portion 12b contacts the distal end portion of the shaft member 18 . Therefore, in this embodiment, when the driving force of the driving mechanism 15 is not acting, the urging force of the tension coil spring 16 enables the reflecting portion 13 to return to the predetermined origin position with respect to the fixed body 14 . .

In this embodiment, when the reflecting portion 13 is not rotated with respect to the fixed body 14 and the reflecting portion 13 is arranged at a predetermined origin position with respect to the fixed body 14, the polarization position of the driving magnet 27 is 27a is arranged at the same position as the tip portion of the shaft member 18 in the front-rear direction. Further, in this embodiment, when the reflecting portion 13 is arranged at the origin position, the magnetic sensor 29 faces the center of the driving magnet 27, and the center of the magneto-sensitive surface of the magnetic sensor 29 in the front-rear direction. and the polarization position 27a of the driving magnet 27 are arranged at the same position in the front-rear direction. Therefore, in this embodiment, it is possible to suppress fluctuations in the output signal of the magnetic sensor 29 when the reflecting portion 13 rotates from the origin position with respect to the fixed body 14 with the horizontal direction as the axial direction of rotation. Therefore, in this embodiment, it is possible to improve the detection accuracy of the amount of rotation of the reflector 13 by the magnetic sensor 29 .

Similarly, in this embodiment, when the reflecting portion 13 is arranged at the origin position, the polarization position 31a of the driving magnet 31 is arranged at the same position as the tip portion of the shaft member 18 in the front-rear direction, and the magnetic The sensor 33 faces the center of the driving magnet 31, and the center of the magneto-sensitive surface of the magnetic sensor 33 in the front-rear direction and the polarization position 31a of the driving magnet 31 are arranged at the same position in the front-rear direction. . Therefore, in this embodiment, it is possible to suppress fluctuations in the output signal of the magnetic sensor 33 when the reflector 13 rotates from the origin position with respect to the fixed body 14 with the vertical direction as the axial direction of rotation. Therefore, in this embodiment, it is possible to improve the detection accuracy of the amount of rotation of the reflector 13 by the magnetic sensor 33 .

In this embodiment, the tension coil spring 16 is arranged on the outer peripheral side of the shaft member 18 so as to surround the shaft member 18 . Therefore, in this embodiment, it is possible to shorten the vertical and horizontal distances between the point of action of the tension coil spring 16 on the reflector 13 and the fulcrum of rotation of the reflector 13 (that is, the tip of the shaft member 18). become. Therefore, in the present embodiment, the driving force of the reflection portion 13 in the rotation direction with the vertical direction as the rotation axis direction and the driving force of the reflection portion 13 in the rotation direction with the left-right direction as the rotation axis direction are the tensile forces. It is possible to suppress the decrease due to the biasing force of the coil spring 16 .

In the present embodiment, the outer diameter of the front end of the tension coil spring 16 arranged on the reflector 13 side is smaller than the outer diameter of the rear end of the tension coil spring 16 arranged on the fixed body 14 side. Therefore, in this embodiment, it is possible to prevent interference between the reflecting portion 13 and the extension coil spring 16 when the reflecting portion 13 rotates with respect to the fixed body 14 with the tip portion of the shaft member 18 as a fulcrum.

In this embodiment, the shaft member 18 is composed of a pipe 22 and a ball 23 fixed to the tip of the pipe 22 . Therefore, in this embodiment, even if the shaft member 18 is thin, the ball 23 is arranged so that the center of the ball 23 is arranged on the axis of the shaft member 18 by utilizing the inner peripheral side of the tip end surface of the pipe 22 . Positioning becomes possible. Therefore, in this embodiment, even if the shaft member 18 is thin, the center of the ball 23 can be easily arranged on the axis of the shaft member 18 .

Further, in this embodiment, in the ball fixing step of fixing the ball 23 to the tip of the pipe 22, the air on the inner peripheral side of the pipe 22 is sucked from the proximal end of the pipe 22 to temporarily fix the ball 23 to the tip of the pipe 22. Since the ball 23 is permanently fixed to the tip of the pipe 22 by welding, the shaft member 18 becomes thinner, the pipe 22 becomes thinner and the ball 23 becomes smaller. Even if it becomes, it becomes possible to perform fixing operation|work of the ball|bowl 23 easily.

(Other embodiments)
The embodiment described above is an example of the preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention.

In the embodiment described above, the extension coil spring 16 may have a constant outer diameter. Further, in the above-described embodiment, the optical unit 1 may be provided with a spring member other than the extension coil spring 16 instead of the extension coil spring 16 . For example, the optical unit 1 may have a leaf spring. In this case, the leaf spring includes, for example, an annular fixed portion fixed to the holder 11, an annular fixed portion fixed to the back surface portion 17c of the frame 17, and an arcuate portion connecting the two fixed portions. and a plurality of spring portions. This leaf spring is a tension spring that biases the reflecting portion 13 against the fixed body 14 in the direction in which the contact portion 12b contacts the tip portion of the shaft member 18. As shown in FIG.

This leaf spring is arranged on the outer peripheral side of the shaft member 18 so as to surround the shaft member 18 . Specifically, the plate spring is arranged on the outer peripheral side of the second holding portion 17k so as to surround the second holding portion 17k. If a leaf spring is provided in place of the tension coil spring 16, the size of the optical unit 1 can be reduced in the front-rear direction. Further, when a leaf spring is provided instead of the tension coil spring 16, it is possible to restrict the movement of the reflecting portion 13 with respect to the fixed body 14 in the rotation direction with the front-rear direction as the rotation axis direction. Become.

In the embodiment described above, the outer diameter of ball 23 may be larger than the outer diameter of pipe 22 . Moreover, in the embodiment described above, the pipe 22 and the ball 23 may be made of different materials. Furthermore, in the embodiment described above, the ball 23 may be fixed to the tip of the pipe 22 with an adhesive. Further, in the embodiment described above, the shaft member 18 may be a single cylindrical member having a hemispherical tip. In this case, the shaft member 18 may be formed separately from the frame 17 in the same manner as in the embodiment described above, or may be formed integrally with the frame 17 so as to protrude forward from the rear surface portion 17c. Also good. Moreover, in the embodiment described above, the reflecting portion 13 does not have to include the fixing plate 12 . In this case, a contact portion with which the tip portion of the shaft member 18 contacts is formed inside the holder 11 .

In the embodiment described above, the polarization position 27a of the driving magnet 27 may be arranged at a position shifted from the tip of the shaft member 18 in the front-rear direction when the reflecting portion 13 is arranged at the origin position. . Further, in the above embodiment, when the reflecting portion 13 is arranged at the origin position, the polarization position 31a of the driving magnet 31 is arranged at a position shifted from the tip portion of the shaft member 18 in the front-rear direction. Also good.

In the embodiment described above, the drive mechanism 15 may include a third drive mechanism that rotates the reflecting portion 13 with respect to the fixed body 14 with the front-rear direction as the axial direction of rotation. In this case, for example, the third drive mechanism includes a drive magnet and a drive coil that face each other in the left-right direction. It is magnetized so as to have a magnetic pole different from the magnetic pole. Moreover, in the form mentioned above, the drive mechanism 15 does not need to be provided with the 1st drive mechanism 25 or the 2nd drive mechanism 26. FIG.

In the embodiment described above, the entire shaft member 18 may be arranged in the arrangement recess 21 . Further, in the above-described embodiment, the shaft member 18 may be arranged so that the axial direction of the shaft member 18 (that is, the axial direction of the pipe 22) is aligned with the vertical direction. In this case, for example, the axis of shaft member 18 coincides with optical axis L1 of lens 4 . Further, in the above-described embodiment, the optical unit 1 may include a reflecting mirror formed with a reflecting surface for reflecting light incident from the outside instead of the prism 10 .

1 optical unit (optical unit with shake correction function)
10 Prism (reflective member)
10a reflective surface 12b contact portion 13 reflective portion 14 fixed body 15 drive mechanism 16 tension coil spring (spring member, tension spring)
Reference Signs List 18 shaft member 21 placement recess 22 pipe 23 ball 25 first drive mechanism 26 second drive mechanism 27 drive magnet (first drive magnet)
27a Polarization position (polarization position of the first driving magnet)
28 drive coil (first drive coil)
29 magnetic sensor (first magnetic sensor)
31 drive magnet (second drive magnet)
31a Polarization position (polarization position of the second driving magnet)
32 drive coil (second drive coil)
33 magnetic sensor (second magnetic sensor)
X Axial direction of shaft member Y Second direction Z First direction

Claims (8)

a reflecting section having a reflecting member formed with a reflecting surface that reflects incident light from the outside; a fixed body that holds the reflecting section; and a drive mechanism that rotates the reflecting section with respect to the fixed body. , and a spring member that biases the reflecting portion,
The fixed body includes a shaft member that protrudes toward the center of the reflecting section,
The tip of the shaft member is formed in a hemispherical shape,
An arrangement recess in which at least part of the shaft member is arranged is formed in the reflection section,
A contact portion is formed in the arrangement recess for contacting the tip portion of the shaft member,
the spring member biases the reflecting portion against the fixed body in a direction in which the contact portion contacts the distal end portion of the shaft member;
An optical unit with a shake correction function, wherein the tip of the shaft member serves as a fulcrum of rotation of the reflecting section with respect to the fixed body. 2. An optical unit with a shake correcting function according to claim 1, wherein the axial direction of said shaft member is orthogonal to the first direction, which is the optical axis direction of light incident on said reflecting surface. The drive mechanism includes a first drive mechanism that rotates the reflecting portion with respect to the fixed body with the first direction as an axial direction of rotation, and an axial direction of the shaft member that is perpendicular to the first direction. 3. The optical unit with a shake correcting function according to claim 2, further comprising a second driving mechanism for rotating the reflecting portion with respect to the fixed body with the second direction as the axial direction of rotation. The first drive mechanism includes a first drive magnet and a first drive coil that are arranged to face each other in the second direction, and a drive mechanism that rotates the fixed body in a rotation direction with the first direction as an axial direction of rotation. A first magnetic sensor for detecting the amount of rotation of the reflector,
The second driving mechanism includes a second driving magnet and a second driving coil that are arranged to face each other in the first direction, and a driving mechanism that rotates the fixed body in a rotational direction with the second direction as an axial direction of rotation. A second magnetic sensor for detecting the amount of rotation of the reflecting part,
The first magnetic sensor is arranged to face the first driving magnet in the second direction,
The second magnetic sensor is arranged to face the second driving magnet in the first direction,
The first driving magnet and the second driving magnet are polarized to two poles in the axial direction of the shaft member,
At least one of the polarization position of the first driving magnet and the polarization position of the second driving magnet is aligned with the axis when the reflecting portion is arranged at a predetermined origin position with respect to the fixed body. 4. The optical unit with a shake correction function according to claim 3, wherein the optical unit is arranged at the same position as the distal end portion of the shaft member in the axial direction of the member. 5. The optical unit with shake correction function according to claim 3, wherein the spring member is a tension spring. The tension spring is a tension coil spring,
6. The optical unit with shake correction function according to claim 5, wherein the shaft member is arranged on the inner peripheral side of the tension coil spring. 7. The extension coil spring according to claim 6, wherein the outer diameter of one end of the extension coil spring disposed on the reflecting portion side is smaller than the outer diameter of the other end of the extension coil spring disposed on the fixed body side. Optical unit with anti-shake function. The shaft member comprises a cylindrical pipe and a spherical ball fixed to the tip of the pipe,
The outer diameter of the ball is larger than the inner diameter of the pipe,
8. The optical unit with shake correction function according to claim 1, wherein a portion of said ball constitutes a distal end portion of said shaft member.

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