Electric mechanical transducer and optical type pickup apparatus

Details Electric mechanical transducer and optical type pickup apparatus Electric mechanical transducer and optical type pickup apparatus

1987-03-03

1989-07-04

Faber, Alan

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 44, 350247, 350255, G11B 709, G11B 7135

Patent

active

048456993

ABSTRACT:
A small-sized electric mechanical transducer wherein plates are disposed to surround a bobbin in association with yokes. Magnetic passages are formed among the plates. Each of a pair of magnets drives the bobbin in accordance with the electric signals input into the driving coil. Also, an optical type pickup apparatus positively capable of the signal reading operation in which the lens holder is not out of shape even if the lens holder is driven in the focusing direction and the tracking direction, because the gravity center of the lens holder is conformed to the action point of the resultant force of the forces to be produced by the control signals to be input into the driving coil, and by the magnetic field of the magnetic circuit.

REFERENCES:
patent: 4547871 (1985-10-01), Sugiyama et al.
patent: 4568142 (1986-02-01), Iguma
patent: 4615585 (1986-10-01), Van Sluys et al.
patent: 4633456 (1986-12-01), Luecke
patent: 4643522 (1987-02-01), Takashima
patent: 4646283 (1987-02-01), Ito et al.
patent: 4658390 (1987-04-01), Fujii et al.
patent: 4679904 (1987-07-01), Kurihara
patent: 4759005 (1988-07-01), Kasahara

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