Rolling magnetic driving unit and optical unit with shake correction function

• US 10,809,542 B2
• Filed: 05/07/2018
• Issued: 10/20/2020
• Est. Priority Date: 05/08/2017
• Status: Active Grant

• Current Assignee: Nidec Sankyo Corporation (Nidec Corporation)
• Original Assignee: Nidec Sankyo Corporation (Nidec Corporation)
• Inventors: Minamisawa, Shinji, Sue, Takeshi, Gomyo, Masato
• Primary Examiner(s): Stanford, Christopher
• Application Number:
  US15/972,239
• Publication Number:
  US 20180321462A1
• Time in Patent Office: 897 Days
• CPC Class Codes: G02B 13/001 Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras G02B23/243 takes precedence
• CPC Class Codes: G02B 27/646 compensating for small deviations, e.g. due to vibration or shake movement of one or more optical elements for control of motion blur in cameras, projectors or printers G03B2205/0007; image stabilisation in cameras peculiar to the presence or use of an electronic image sensor H04N23/68
• CPC Class Codes: G02B 7/023 permitting adjustment
• CPC Class Codes: G02B 7/04 with mechanism for focusing or varying magnification
• CPC Class Codes: G02B 7/102 controlled by a microcomputer cameras with interchangeable lenses G03B17/14
• CPC Class Codes: G03B 2205/0015 by displacing one or more optical elements normal to the optical axis
• CPC Class Codes: G03B 2205/0023 by tilting or inclining one or more optical elements with respect to the optical axis
• CPC Class Codes: G03B 2205/0069 using electromagnetic actuators, e.g. voice coils
• CPC Class Codes: H02K 11/215 Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
• CPC Class Codes: H02K 11/22 Optical devices
• CPC Class Codes: H02K 11/33 Drive circuits, e.g. power electronics H02K11/38 takes precedence
• CPC Class Codes: H02K 21/24 with magnets axially facing the armatures, e.g. hub-type cycle dynamos
• CPC Class Codes: H02K 21/26 with rotating armatures and stationary magnets
• CPC Class Codes: H02K 2201/18 Machines moving with multiple degrees of freedom
• CPC Class Codes: H02K 7/086 radially supporting the rotor around a fixed spindle; radially supporting the rotor directly H02K7/09 takes precedence
• CPC Class Codes: H02K 7/14 Structural association with mechanical loads, e.g. with hand-held machine tools or fans with fan or impeller for cooling the machine H02K9/06
• CPC Class Codes: H05K 1/028 Bending or folding regions of flexible printed circuits H05K1/0283 takes precedence
• CPC Class Codes: H05K 1/189 characterised by the use of a flexible or folded printed circuit H05K3/326 takes precedence
• CPC Class Codes: H05K 2201/10121 Optical component, e.g. opto-electronic component

Abstract

To provide a rolling magnetic driving unit that can be employed for both of an optical unit with shake correction function that causes an optical module to swing and rotate and an optical unit with shake correction function that causes the optical module to rotate, a second unit (i.e., a rolling magnetic driving unit) includes: a rotation seat; and a fixation member that supports the rotation seat via a bearing mechanism. The rotation seat and the bearing mechanism configure a rotation-supporting mechanism. The rotation-supporting mechanism supports a holder, which supports the optical module such that the optical module is able to swing, such the holder is able to rotate on the axis. Furthermore, the second unit includes a rolling magnetic driving mechanism, which includes a rolling driving coil that is held by the rotation seat and a rolling driving magnet that is held by the fixation member.

Claims

1. A rolling magnetic driving unit that causes an optical module provided with an optical element to rotate on an optical axis of the optical element, the rolling magnetic driving unit comprising:

a rotation-supporting mechanism that includes

a rotation seat for supporting the optical module and

a bearing mechanism configured to support the rotation seat in such a manner that the rotation seat is able to rotate on a predetermined axis;

a fixation member configured to support the optical module via the rotation-supporting mechanism; and

a rolling magnetic driving mechanism configured to cause the rotation seat to rotate,

wherein the rolling magnetic driving mechanism includes

a coil that is fixed to either one of the rotation seat and the fixation member and

a magnet that is fixed to the other one of the rotation seat and the fixation member and is opposed to the coil in a direction of the axis,

wherein the rotation seat includes

a seat main body and

a shaft part extending from the seat main body toward the fixation member in the direction of the axis,

wherein the bearing mechanism includes a ball bearing that is attached to an outer circumferential side of the shaft part.

2. The rolling magnetic driving unit according to claim 1 further comprising an angular-position-recovering mechanism configured to cause the rotation seat to recover to a reference angular position of rotation on the axis.

3. The rolling magnetic driving unit according to claim 2,

wherein the magnet is polarized and magnetized in a circumferential direction,

wherein the angular-position-recovering mechanism includes an angular-position-recovering magnetic member that is attached to one of the rotation seat and the fixation member to which the coil is fixed, and

wherein, when a state in which the rotation seat is at the reference angular position is seen in the direction of the axis, a center of the angular-position-recovering magnetic member overlaps with a magnetization-polarized line of the magnet.

4. The rolling magnetic driving unit according to claim 3, wherein the angular-position-recovering magnetic member is positioned on an opposite side of the magnet with reference to the coil in such a manner that the coil is therebetween in the direction of the axis.

5. The rolling magnetic driving unit according to claim 4,

wherein a fixation region to which the angular-position-recovering magnetic member is fixed is provided on the one of the rotation seat and the fixation member to which the coil is fixed, and

wherein a position to which the angular-position-recovering magnetic member is fixed is changeable inside the fixation region.

6. The rolling magnetic driving unit according to claim 1,

wherein the rolling magnetic driving mechanism includes a yoke that is positioned on an opposite side of the coil with reference to the magnet,

wherein the fixation member includes

a magnet-holding depression part provided on an opposed surface that is opposed to the rotation seat in the direction of the axis and

a yoke-holding depression part provided on a non-opposed surface that faces toward an opposite side of the rotation seat in the direction of the axis,

wherein the magnet is fixed to the magnet-holding depression part,

wherein the yoke is fixed to the yoke-holding depression part, and

wherein the coil is fixed to an opposed surface of the rotation seat, the opposed surface of the rotation seat being opposed to the fixation member.

7. The rolling magnetic driving unit according to claim 1 further comprising a rotation-angle-range-restraining mechanism configured to define a rotation-angle range of the rotation seat,

wherein the rotation-angle-range-restraining mechanism includes

a protrusion part protruding from either one of the rotation seat and the fixation member toward the other one of the rotation seat and the fixation member and

an abutting part provided on the other one of the rotation seat and the fixation member in such a manner that the abutting part is able to abut against the protrusion part from a circumferential direction.

8. The rolling magnetic driving unit according to claim 1,

wherein the fixation part includes

a holding part in a cylindrical shape that is configured to hold the ball bearing from the outer circumferential side and

a pressure-imposing mechanism configured to impose a pressure in the direction of the axis on the ball bearing from an opposite side of the rotation seat.

9. The rolling magnetic driving unit according to claim 8,

wherein the bearing mechanism includes a second ball bearing that is attached on the outer circumferential side of the shaft part in such a manner that the second ball bearing is coaxial with the ball bearing,

wherein the second ball bearing is positioned between the ball bearing and the rotation seat,

wherein the holding part holds the ball bearing and the second ball bearing from the outer circumferential side, and

wherein the pressure-imposing mechanism imposes the pressure on the second ball bearing via the ball bearing.

10. The rolling magnetic driving unit according to claim 8,

wherein the bearing mechanism includes a plurality of roll-moving members that are provided on the outer circumferential side of the ball bearing and arranged between the rotation seat and the fixation member in the direction of the axis, and

wherein the pressure-imposing mechanism imposes the pressure via the ball bearing in such a direction that pushes the fixation member toward the seat main body.

11. The rolling magnetic driving unit according to claim 10,

wherein the rotation seat includes a seat-side opposed part that is around the axis and is opposed to the fixation member,

wherein the fixation member includes a fixation-member-side opposed part that is opposed to the seat-side opposed part in the direction of the axis,

wherein the seat-side opposed part includes a seat-side annular groove enclosing the axis,

wherein the fixation-member-side opposed part includes a fixation-member-side annular groove that is opposed to the seat-side annular groove, and

wherein the plurality of roll-moving members are inserted in the seat-side annular groove and the fixation-member-side annular groove.

12. The rolling magnetic driving unit according to claim 11,

wherein the bearing mechanism includes a retainer in an annular shape enclosing the axis between the seat-side opposed part and the fixation-member-side opposed part,

wherein the retainer includes a plurality of through holes arranged in a circumferential direction, and

wherein the plurality of roll-moving members are inserted to the plurality of through holes, respectively.

13. The rolling magnetic driving unit according to claim 12,

wherein the retainer includes, between two of the plurality of through holes that are adjacent to each other in the circumferential direction,

a first projection part that protrudes toward the seat-side opposed part, and

a second projection part that protrudes toward the fixation-member-side opposed part,

wherein the first projection part is able to make contact in a sliding manner with an edge portion of the seat-side annular groove provided on the seat-side opposed part, and

wherein the second projection part is able to make contact in a sliding manner with an edge portion of the fixation-member-side annular groove provided on the fixation-member-side opposed part.

14. The rolling magnetic driving unit according to claim 12, wherein the retainer includes cutout parts at two distant locations on an outer circumferential edge.

15. The rolling magnetic driving unit according to claim 6 further comprising a cover member that is provided on an opposite side of the fixation member with reference to the rotation seat and is configured to cover the yoke in the direction of the axis from a position apart from the yoke,

wherein a flexible printed circuit board is connected to the coil, and

wherein the flexible printed circuit board is drawn between the yoke and the cover member.

16. The rolling magnetic driving unit according to claim 1,

wherein the rotation seat includes a position-determining part for fixing the optical module while making the optical axis and the axis corresponding to each other.

17. An optical unit with shake correction function comprising:

the rolling magnetic driving unit according to claim 1; and

an optical unit with shake correction function that is provided with

the optical module,

a swing-supporting mechanism configured to support the optical module in such a manner that the optical module is able to swing,

a supporting member configured to support the optical module via the swing-supporting mechanism, and

a swing magnetic driving mechanism configured to cause the optical module to swing,

wherein the optical module is attached to the rotation seat via the supporting member.

18. An optical unit with shake correction function comprising:

the rolling magnetic driving unit according to claim 1; and

the optical module,

wherein the optical module is attached to the rotation seat.