Apparatus for driving objective lens

Details Apparatus for driving objective lens Apparatus for driving objective lens

1990-02-09

1992-08-18

Arnold, Bruce Y.

Optical: systems and elements

Lens

With support

359823, 369 4414, G02B 702, G11B 700

Patent

active

051404710

ABSTRACT:
In an apparatus for moving an objective lens, the objective lens is fitted in a cylindrical lens holder. A focusing coil is fixed in the holder and the holder is suspended by one ends of a pair of leaf springs which is symmetrically arranged in respect to a reference line. The other end of the leaf springs is fixed on a rotary body which is rotatably supported on a base, includes a cup section and a triangular section integrally formed with the cup section and is formed into a symmetrical shape about the reference line. A focusing magnetic circuit in which the focusing coil is located, is mounted on the triangular section and a pair of radial coils are fixed to the side surface of the cup section. A pair of radial magnetic circuits, each including yokes and permanent magnets, are located at both side of the rotary body and the radial coils are so mounted around the corresponding yokes, respectively that the coils slides along the corresponding yokes, respectively. The lens holder is moved along the optical axis of the objective lens when the focusing coil is energized and is moved in a radial direction normal to the optical axis when the radial coils are energized.

REFERENCES:
patent: 4607913 (1986-08-01), Jansen
patent: 4761774 (1988-08-01), Ishibashi et al.
patent: 4792935 (1988-12-01), Kime et al.
patent: 4927235 (1990-05-01), Naruai
patent: 4939711 (1990-07-01), Yoda
patent: 4945528 (1990-07-01), Jansen et al.
Patent Abstracts of Japan, Oct. 23, 1986, vol. 10, No. 312 p. 69 P 509.
Patent Abstracts of Japan, May 2, 1987, vol. 11, No. 137 p. 92 D 572.

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