Dynamic optical information storage or retrieval – Dynamic mechanism optical subsystem – Transducer carriage or actuator
Reexamination Certificate
2011-07-12
2011-07-12
Cao, Allen T (Department: 2627)
Dynamic optical information storage or retrieval
Dynamic mechanism optical subsystem
Transducer carriage or actuator
Reexamination Certificate
active
07979872
ABSTRACT:
A disclosed lens actuator includes: an objective lens condensing a light beam on an optical storage medium; a diffractive element providing compatibility with plural types of optical storage media relative to light sources of plural different wavelengths; and a lens holder including the objective lens and diffractive element in an opposing manner. The objective lens is driven with the lens holder in at least a focusing direction and tracking direction relative to the optical storage medium. At least three protrusions are set on the lens holder in directions orthogonal to an optical axis of the objective lens. Another disclosed lens actuator includes: an objective lens and a drive coil disposed on a lens holder, wherein a diffractive element is disposed on the lens holder via an inertia weight including a metallic material and disposed so as to face the objective lens.
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Cao Allen T
Dickstein & Shapiro LLP
Ricoh & Company, Ltd.
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