Use of a photoelectric converted signal to inspect an...

Details Use of a photoelectric converted signal to inspect an... Use of a photoelectric converted signal to inspect an...

2009-02-20

2011-11-08

Luu, Thanh X (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C356S624000

Reexamination Certificate

active

08053712

ABSTRACT:
An inspecting method for an object lens driving device including a base, an objective lens, a holder for holding the objective lens on the base, and a drive mechanism for driving the holder so as to move the objective lens in the focus direction, the method comprising the steps of: emitting a laser beam through the objective lens; allowing the laser beam emitted through the objective lens to pass through an aperture having a predetermined diameter; applying to the drive mechanism a drive voltage for moving the holder between a first position closest to a surface of the base and a second position farther than the first position from the surface of the base; performing photoelectric conversion of the laser beam having passed through the aperture; and inspecting the objective lens driving device based on a signal obtained by the photoelectric conversion.

REFERENCES:
patent: 3643015 (1972-02-01), Davidovits et al.
patent: 7254097 (2007-08-01), Nogami et al.
patent: 2003-016668 (2003-01-01), None

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