Lens tilt error reduction actuator

Details Lens tilt error reduction actuator Lens tilt error reduction actuator

1996-07-24

1998-06-16

Ben, Loha

Optical: systems and elements

Lens

With support

359823, 369 4414, 369 4415, G02B 702

Patent

active

057680345

ABSTRACT:
An optical actuator is disclosed for positioning a lens to focus a laser light beam on a surface of a member, such as on optical disk, with minimum lens tilt error. The optical actuator includes a lens mount for supporting the lens, and at least one upper flexure and one lower flexure that are each fixed to the lens mount at a point. The flexures are arranged so that they when viewed from one side a line defined by each flexure would extend from the fixed point of each flexure and intersect at a point spaced at a distance from each flexure, forming an angle .theta. therebetween. The optical actuator further includes a structure for applying a force to the lens mount along a line to cause the upper flexure and lower flexure to deflect such that the lens moves to focus the light beam. The intersection point of the upper flexure and lower flexure is selected such that the lens tilt error caused by tension and compression of the upper flexure and lower flexure is compensated by a tilt caused by angle .theta., to thereby substantially minimize lens tilt error during focusing of the light beam.

REFERENCES:
patent: 4991161 (1991-02-01), Ikegame et al.
patent: 5208703 (1993-05-01), Ikegame et al.
patent: 5414680 (1995-05-01), Ikegame

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