Actuator and auto-focus imaging system using same

Details Actuator and auto-focus imaging system using same Actuator and auto-focus imaging system using same

2006-12-14

2008-11-04

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

With support

Reexamination Certificate

active

07446959

ABSTRACT:
An actuator includes at least one actuator unit. The actuator unit includes a ring, a plurality of first actuator elements, and a plurality of second actuator elements disposed on the ring. Each of the first actuator elements includes a first driving piece and a second driving piece attached to each other. The first driving piece is attached to the ring and is located between the second driving piece and the ring. A coefficient of thermal expansion of the first driving piece is larger than that of the second driving piece. Each of the second actuator elements includes a third driving piece and a fourth driving piece attached to each other. The third driving piece is attached to the ring and is located between the fourth driving piece and the ring. A coefficient of thermal expansion of the third driving piece is less than that of the fourth driving piece.

REFERENCES:
patent: 2005/0007683 (2005-01-01), Ryu et al.

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