Actuator with reduced lens tilt error

Details Actuator with reduced lens tilt error Actuator with reduced lens tilt error

1996-05-30

1997-08-19

Epps, Georgia Y.

Optical: systems and elements

Lens

With support

359823, G02B 702

Patent

active

056594330

ABSTRACT:
An optical actuator is disclosed for positioning a lens to focus a laser light on a surface of a member, such as an optical disk, with minimum lens tilt error. The optical actuator includes a lens mount for supporting the lens, a plurality of flexures fixed to the lens mount, and a based spaced from the lens mount. The optical actuator further includes a motor structure for operating the actuator in energized and de-energized states. In the energized state, a force is applied to the lens mount to cause the lens mount to move in a focus direction. In the de-energized state, the flexures relax, causing the lens mount to move substantially in the focus direction. The optical actuator further includes an actuator travel stop disposed relative to the base and the lens mount for supporting the lens mount in a downward direction when the actuator is in the de-energized state, to thereby prevent the flexures from creeping in such a way so as to result in lens tilt.

REFERENCES:
patent: 4960321 (1990-10-01), Takahashi
patent: 5128806 (1992-07-01), Ohno
patent: 5523891 (1996-06-01), Fujisawa
patent: 5542606 (1996-08-01), McCaslin
patent: 5561646 (1996-10-01), Shtipelman
patent: 5598397 (1997-01-01), Sim

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