Optical unit with shake correction function

Patent metadata

Field	Value
Publication number	US-2018129119-A1
Application number	US-201715809116-A
Country	US
Kind code	A1
Filing date	Nov 10, 2017
Priority date	Nov 10, 2016
Publication date	May 10, 2018
Grant date	—

Abstract

An optical unit with a shake correction function may include an optical module which holds an optical element, a swing support mechanism structured to swingably support the optical module, a holder which holds the optical module through the swing support mechanism, a turnable support mechanism which turnably supports the holder around the axial line, a fixed body which supports the holder through the turnable support mechanism, a magnetic swing drive mechanism structured to swing the optical module, and a magnetic rolling drive mechanism structured to turn the holder. The magnetic swing drive mechanism may include a swing drive magnet fixed to the fixed body and a swing drive coil fixed to the optical module. The magnetic rolling drive mechanism may include a rolling drive magnet fixed to the fixed body and a rolling drive coil disposed on the holder.

First claim

What is claimed is:

1 . An optical unit with a shake correction function, the optical unit comprising:
an optical module structured to hold an optical element; a swing support mechanism structured to swingably support the optical module between a reference posture where a predetermined axial line and an optical axis are coincided with each other and an inclined posture where the optical axis is inclined with respect to the axial line; a holder structured to hold the optical module through the swing support mechanism; a turnable support mechanism structured to turnably support the holder around the axial line; a fixed body structured to support the holder through the turnable support mechanism; a magnetic swing drive mechanism structured to swing the optical module; and a magnetic rolling drive mechanism structured to turn the holder; wherein the magnetic swing drive mechanism comprises:
a swing drive magnet which is fixed to one of the optical module and the fixed body; and
a swing drive coil which is fixed to the other of the optical module and the fixed body so as to face the swing drive magnet; and
wherein the magnetic rolling drive mechanism comprises:
a rolling drive magnet which is fixed to one of the holder and the fixed body; and
a rolling drive coil which is disposed on the other of the holder and the fixed body so as to face the rolling drive magnet.

2 . The optical unit with a shake correction function according to claim 1 , wherein the turnable support mechanism comprises a turnable bearing structured to support the holder on an object side with respect to the swing support mechanism.

3 . The optical unit with a shake correction function according to claim 2 , wherein
the magnetic swing drive mechanism comprises a first magnetic swing drive mechanism and a second magnetic swing drive mechanism respectively structured to swing the optical module, when two directions perpendicular to the axial line and intersecting each other are referred to as a first direction and a second direction, the swing support mechanism swingably supports the optical module around a first axial line along the first direction and around a second axial line along the second direction, the rolling drive magnet and the rolling drive coil face each other in at least one of the first direction and the second direction, and the magnetic rolling drive mechanism is disposed between the first magnetic swing drive mechanism and the second magnetic swing drive mechanism around the axial line.

4 . The optical unit with a shake correction function according to claim 3 , wherein
the first magnetic swing drive mechanism comprises a first swing drive coil fixed to the optical module and a first swing drive magnet fixed to the fixed body, the second magnetic swing drive mechanism comprises a second swing drive coil fixed to the optical module and a second swing drive magnet fixed to the fixed body, and the rolling drive coil is fixed to the holder and the rolling drive magnet is fixed to the fixed body.

5 . The optical unit with a shake correction function according to claim 4 , wherein
the optical module comprises a lens barrel which holds the optical element, the swing support mechanism comprises:
a frame body which surrounds the lens barrel around the axial line;
an optical module side support part structured to swingably support the frame body on a side of the optical module; and
a holder side support part structured to swingably support the frame body on a side of the holder,
the optical module side support part and the holder side support part are located between the first magnetic swing drive mechanism and the second magnetic swing drive mechanisms around the axial line.

6 . The optical unit with a shake correction function according to claim 5 , wherein
the frame body structuring the swing support mechanism is a gimbal spring comprising a frame part and supporting point parts provided in the frame part at four positions around the optical axis, the supporting point part comprises a convex face in a hemispheric shape, the optical module side support part and the holder side support part respectively comprise a contact point part formed of a recessed part in a hemispheric shape, and the optical module side support part is swingably supported by the holder side support part by contacting the convex face in the hemispheric shape of the supporting point part with the contact point part formed in the recessed part in the hemispheric shape.

7 . The optical unit with a shake correction function according to claim 5 , wherein one of the rolling drive coil and the rolling drive magnet is fixed to the holder side support part.

8 . The optical unit with a shake correction function according to claim 5 , wherein the lens barrel is inserted on an inner peripheral side with respect to the turnable bearing.

9 . The optical unit with a shake correction function according to claim 2 , wherein
the turnable bearing is a ball bearing, an outer ring of the ball bearing is held by a circular-shaped inner peripheral face of a case structuring the fixed body, an inner ring of the ball bearing is held on an outer peripheral side of a cylindrical tube part of the holder, and a lens barrel of the optical module which holds the optical element is held on an inner peripheral side of the cylindrical tube part of the holder.

10 . The optical unit with a shake correction function according to claim 9 , wherein
the magnetic swing drive mechanism comprises a first magnetic swing drive mechanism and a second magnetic swing drive mechanism respectively structured to swing the optical module, when two directions perpendicular to the axial line and intersecting each other are referred to as a first direction and a second direction, the swing support mechanism swingably supports the optical module around a first axial line along the first direction and around a second axial line along the second direction, the rolling drive magnet and the rolling drive coil face each other in at least one of the first direction and the second direction, and the magnetic rolling drive mechanism is disposed between the first magnetic swing drive mechanism and the second magnetic swing drive mechanism around the axial line.

11 . The optical unit with a shake correction function according to claim 10 , wherein
the first magnetic swing drive mechanism comprises a first swing drive coil fixed to the optical module and a first swing drive magnet fixed to the fixed body, the second magnetic swing drive mechanism comprises a second swing drive coil fixed to the optical module and a second swing drive magnet fixed to the fixed body, and the rolling drive coil is fixed to the holder and the rolling drive magnet is fixed to the fixed body.

12 . The optical unit with a shake correction function according to claim 10 , wherein
the optical module comprise a lens barrel which holds the optical element, the swing support mechanism comprises:
a frame body which surrounds the lens barrel around the axial line;
an optical module side support part which swingably supports the frame body on a side of the optical module; and
a holder side support part structured to swingably support the frame body on a side of the holder,
the optical module side support part and the holder side support part are located between the first magnetic swing drive mechanism and the second magnetic swing drive mechanisms around the axial line.

13 . The optical unit with a shake correction function according to claim 1 , wherein
the magnetic rolling drive mechanism comprises a magnet

Assignees

• Nidec Sankyo Corp

Inventors

• Minamisawa Shinji
• Sue Takeshi

Classifications

• G03B2205/0069

  using electromagnetic actuators, e.g. voice coils · CPC title

• G03B2205/0015

  by displacing one or more optical elements normal to the optical axis · CPC title

• G03B5/06 Primary

  Swinging lens about normal to the optical axis · CPC title

• G03B5/00 Primary

  Adjustment of optical system relative to image or object surface other than for focusing · CPC title

• G02B27/646

  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 title