Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1989-01-31
1992-05-19
McElheny, Jr., Donald
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
G11B 700
Patent
active
051154218
ABSTRACT:
A laser beam from a laser source is incident on a track of an optical card through an objective lens. Since the optical card is reciprocated along a track direction, the laser beam is scanned on the track. The light beam reflected by the optical card is guided to a photo-detector through the objective lens and a mirror. An objective lens actuator and an objective lens position sensor are arranged near the objective lens. The objective lens actuator performs tracking of the laser beam by moving the objective lens in a direction perpendicular to the track, and focuses the objective lens by moving it in a direction perpendicular to the optical card. The lens position sensor detects the displacement of the lens during tracking. A track-error signal generated from the photo-detector is supplied to the actuator through a phase compensate circuit and a power amplifier, thus performing tracking servo control. An output from the lens position sensor is supplied to an off-track detector. The off-track detector is constituted by a low-pass filter for cutting a high-frequency component, such as noise, a DC-cut circuit, and a window comparator.
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McElheny Jr. Donald
Olympus Optical Co,. Ltd.
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