Objective-lens driving apparatus

Details Objective-lens driving apparatus Objective-lens driving apparatus

1994-11-03

1995-10-31

Ben, Loha

Optical: systems and elements

Lens

With support

359824, 369 4415, G02B 702

Patent

active

054635012

ABSTRACT:
In an objective-lens driving device of the present invention, an objective lens holder is supported by a parallel link mechanism so that it is permitted to rock in the focusing direction and in the tracking direction. The parallel link mechanism is provided with hinges that are formed as thinner portions having flexibility. A magnet is secured to the rocking end of the objective lens holder. Iron pieces are symmetrically fixed to cavity sections in tracking coils that are fixed to the base opposite to the magnet. The center of the rocking movement of the objective lens holder, the center of the magnet and the center of the symmetrical arrangement of the iron pieces are disposed on a straight line. In this case, the objective lens fixed to the objective lens holder is in the neutral position. As a result, during non-operating state, the neutral position of the objective lens is maintained by attracting forces that are exerted between the magnet and iron pieces.

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patent: 5073883 (1991-12-01), Mitsunori
patent: 5128806 (1992-07-01), Ohno
patent: 5191484 (1993-03-01), Yeon et al.
patent: 5206762 (1993-04-01), Kashara et al.

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