Objective lens support having rotary and axial motions for use i

Details Objective lens support having rotary and axial motions for use i Objective lens support having rotary and axial motions for use i

1990-04-16

1991-09-10

Arnold, Bruce Y.

Optical: systems and elements

Lens

With support

359824, 369 4415, G02B 702

Patent

active

050468197

ABSTRACT:
A rotary objective lens support having a predetermined tolerance to parasitic vibrations enables rapid focussing and track following and track changing motions. The rotary support is a beam having a central aperture for slidably and rotatably receiving a pivot pin. A pair of apertures on laterally opposite sides of the central aperture receive motion actuating U-shaped magnets. A lens is mounted on one end portion of the beam and a position indicator is mounted on the opposite end portion of the member. A base, which includes the pivot pin and U-shaped magnets, has a position-sensing means for sensing the rotational position of the member. A pair of outside walls extend past and partially form the magnet receiving apertures. The walls are shaped to reduce effects of parasitic vibrations. In one embodiment, the lens and position indicator are mounted on axially offset end portions; the walls extend between the end portions such that an oblique surface is formed on each of the walls. This shape of the walls provides the reduction of parasitic vibrations.

REFERENCES:
patent: 4419614 (1983-12-01), Kimura
patent: 4482988 (1984-11-01), Tsurushima et al.
patent: 4679903 (1987-07-01), Kasahara et al.
patent: 4715024 (1987-12-01), Musha
patent: 4767187 (1988-08-01), Gijzen et al.
patent: 4790628 (1988-12-01), Nanno et al.
patent: 4796248 (1989-01-01), Ozaki et al.
patent: 4817076 (1989-03-01), Van Sluys et al.

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