Pick-up control circuits for disc information reproducing appara

Details Pick-up control circuits for disc information reproducing appara Pick-up control circuits for disc information reproducing appara

1986-06-17

1989-08-01

Shoop, Jr., William M.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 33, 369 43, 369 44, G11B 1722

Patent

active

048539139

ABSTRACT:
Pick-up control circuits for disc information reproducing apparatus. The apparatus includes a carriage, a source of a light beam mounted in the carriage, a focus lens for placing the light beam on a disc, the focus lens being mounted on a standard position in the carriage but movable by a prescribed range from the standard position, a circuit for detecting a tracking error signal responsive to a deviation of the light beam from a center of the track, a lens actuator for driving the focus lens to deviate from the standard position, a carriage actuator for driving the carriage to move in the radial direction in respect of the disc, a power source for applying a drive voltage to the carriage actuator, a switch connected between the power source and the carriage actuator, and a circuit for controlling the switch to apply the drive voltage intermittently to the carriage actuator, so that focus lens is moved to the standard position on or before reaching an end of the movable range.

REFERENCES:
patent: 4545003 (1985-10-01), Hirano et al.
patent: 4603412 (1986-07-01), Yamazaki
patent: 4607358 (1986-08-01), Maeda et al.
patent: 4675855 (1987-06-01), Iso et al.
patent: 4701897 (1987-10-01), Nakagawa
patent: 4701898 (1987-10-01), Giddings

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