Objective lens actuator
AssigneeHon Hai Precision Industry Co., Ltd.
InventorsChih-Hang Chao, Yu-Hsu Lin, Jeng-Da Wu, Chun-Ming Chen
Life of this patent
Estimating the term…
Abstract
In one preferred embodiment, an objective lens actuator includes a base, a suspension apparatus mounted on the base, a holder suspended by the suspension apparatus for holding an objective lens, a voice coil motor (VCM) for driving the holder to vibrate, and a cover. The VCM includes a first yoke, a second yoke and a pair of magnets fixed on the first yoke and the second yoke respectively. The first yoke and the second yoke respectively include a first part and a second part. The cover is made of a material having a magnetic conductivity. The cover connects the first part and the second part of each of the first yoke and the second yoke.
Claims16
An objective lens actuator comprising:
- a base;
- a suspension apparatus mounted on the base;
- a holder for holding an objective lens, the holder suspended by the suspension apparatus;
- a voice coil motor (VCM) driving the holder to vibrate, the VCM comprising a first yoke, a second yoke, and a pair of magnets fixed on the first yoke and the second yoke respectively, the first yoke and the second yoke respectively comprising a first part and a second part;
- and
- a cover made of a material having a magnetic conductivity, the cover comprising a top plate defining a through hole corresponding to the objective lens, a first block for connecting tops of the first part and the second part of the first yoke, and a second block for connecting tops of the first part and the second part of the second yoke.
An objective lens actuator comprising:
- a base;
- a suspension apparatus mounted on the base;
- a holder for holding an objective lens, the holder suspended by the suspension apparatus;
- a voice coil motor (VCM) driving the holder to vibrate, the VCM comprising a first U-shaped yoke, a second U-shaped yoke facing the first U-shaped yoke, and a pair of magnets fixed on the first yoke and the second yoke respectively, each of the first and second U-shaped yokes comprising a first part and a second part, a distance between the first parts of the first and second U-shaped yokes being shorter than a distance between the second parts of the first and second U-shaped yokes;
- and
- a cover made of a material having magnetic conductivity, the cover covering tops of the first and second parts of each of the first yoke and the second yoke respectively to increase the magnetic conductivity of the tops of the first yoke and the second yoke.
An optical apparatus comprising:
- means for performing image-pickup function of said optical apparatus installable in said optical apparatus;
- an objective lens installable in said optical apparatus next to said means, said objective lens transmitting light therethrough between said means and a target of said optical apparatus;
- and
- an actuator installable beside said objective lens to adjustably control a relative location of said objective lens in said optical apparatus, said actuator comprising a holder to hold said objective lens, and a voice coil motor (VCM) to drive said holder for controlling of said relative location of said objective lens, said VCM comprising at least one U-shaped yoke which contributes to generation of a magnetic field in said VCM and defines a void part at a side thereof, a cover of said actuator covering said objective lens and said VCM jointly to form said actuator, and spanning across said void part of said at least one U-shaped yoke to substantially connect two separate parts of said at least one U-shaped yoke located oppositely beside said void part together when said cover is placed on said at least one U-shaped yoke in order to contribute to adjusting magnetic flux of said magnetic field in said VCM along said side of said at least one U-shaped yoke.
Dependencies are inferred from the claim text.