Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2007-03-06
2007-03-06
Wellington, Andrea (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S053280
Reexamination Certificate
active
10164373
ABSTRACT:
A focal detecting means (35) of a controller (25) controls an actuator driver (38) to actuate an actuator (12) to vibrate an objective lens (3) in a direction along an optical axis. An output of a focus error signal from a signal generator (27) is checked by a signal detecting means (46) and presence of a workpiece is determined when the signal is detected. When the presence of the workpiece is detected, the focal detecting means (35) moves the objective lens (3) along the optical axis by the actuator (12) and a focus position is recognized with reference to a position signal from a position detecting means (49) together with the focus error signal, where the objective lens (3) is moved to the focus position for focusing.
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Kataoka Masanobu
Nemoto Kiichiro
Battaglia M. V.
Mitutoyo Corporation
Oliff & Berridg,e PLC
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