Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2006-04-11
2006-04-11
Patel, Gautam R. (Department: 2655)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044410, C359S318000, C359S319000
Reexamination Certificate
active
07027369
ABSTRACT:
An optical pickup apparatus (10) for reading data from a plurality of tracks of an optical disc (34) at the same time by focussing spots (M, . . . ) of each light beam on a plurality of tracks, passing the reflected light beams of spots (M, . . . ) sequentially through an objective lens (30), a collimator lens (28), and a focus adjusting lens (50) in this order, and detecting the reflected light beams with photodiodes (52M, . . . ) disposed along a photodiode light reception plane (68). In order to make each reflected light become incident upon each photodiode (52M, . . . ), a case (72) and a bracket (78) are separated from a chassis (70), and support the focus adjusting lens (50) and the photodiodes (52M, . . . ) respectively. The case (72) and bracket (78) are made so that they can be fixed to the chassis (70) at optional positions in a predetermined area along a direction of the optical axis (66). While the case (72) and bracket (78) are moved along the optical axis (66) direction, positions along the optical axis (66) where the reflected light beams are allowed to enter the photodiodes (52M, . . . ) are searched and the case (72) and bracket (78) are fixed to the chassis (70) at the searched positions.
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Miyazawa Hiroshi
Tachizawa Hidemi
Kabushiki Kaisha Kenwood
Patel Gautam R.
Robinson Eric J.
Robinson Intellectual Property Law Office P.C.
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