1986-10-23
1988-06-21
Punter, William H.
350255, G02B 702, G02B 711
Patent
active
047521171
ABSTRACT:
Disclosed is a device for driving an objective lens of an optical disk apparatus in both the tracking direction and the focusing direction. The device comprises a rocker arm supported rotatably and axially slidably by a supporting shaft and carrying the objective lens on its front end, a pair of first coils disposed on both sides respectively of an end on rear end of the rocker arm remote from the front end carrying the objective lens for driving the objective lens in the tracking direction, and a second coil mounted to the lower surface of the rocker arm for driving the objective lens in the focusing direction. A pair of magnets for producing a magnetic field for driving the objective lens in the focusing direction and a magnetic field for driving the objective lens in the tracking direction are mounted to a pair of yokes erected on both sides of the supporting shaft respectively. Current is supplied to the first coils to produce moments of rotation rotating the rocker arm thereby driving the objective lens in the tracking direction, and current is supplied to the second coil to move the rocker arm in the axial direction of the supporting shaft thereby driving the objective lens in the focusing direction.
REFERENCES:
patent: 4467463 (1984-08-01), Yano
patent: 4566089 (1986-01-01), Kime
patent: 4571026 (1986-02-01), Maruta
patent: 4596444 (1986-06-01), Ushida
patent: 4664476 (1987-05-01), Kasuga
Abe Masayuki
Hida Shigefumi
Ichikawa Atsushi
Onuki Hideo
Yabe Akio
Hitachi , Ltd.
Punter William H.
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