[54] INFORMATION RECORDING/ REPRODUCTION APPARATUS
[75] Inventor: Tetsuo Ikegame, Hachiojo, Japan
[73] Assignee: Olympus Optical Co., Ltd., Tokyo, Japan
[21] Appl. No.: 08/892,834 [22] Filed: Jul. 15, 1997
Related U.S. Application Data
[62] Division of application No. 08/633,429, Apr. 17, 1996, abandoned.
[30] Foreign Application Priority Data
Apr. 25, 1995 [IP] lapan 7-101095
Apr. 25, 1995 [IP] lapan 7-101096
[51] Int. CI.6 G11B 7/00; G11B 23/00
[52] U.S. CI 369/271; 369/112; 369/118;
369/270; 369/44.24
[58] Field of Search 369/283, 112,
369/118, 103, 94, 95, 44.21-44.25, 44.27, 44.11, 44.14, 264, 269, 270, 271
[56] References Cited
U.S. PATENT DOCUMENTS
3,999,009 12/1976 Bouwhuis 369/94
4,037,929 7/1977 Bricot et al 359/40
4,124,273 11/1978 Huignard et al 359/319
4,725,721 2/1988 Nakamura et al 250/201.1
5,097,464 3/1992 Nishiuchi et al 369/112
5,157,555 10/1992 Reno 359/823
5,202,875 4/1993 Rosen et al 369/94
5,235,581 8/1993 Miyagawa et al 369/44.12
5,408,453 4/1995 Holtslag et al 369/44.23
5,416,757 5/1995 Luecke et al 369/44.23
5,526,336 6/1996 Park et al 369/94
FOREIGN PATENT DOCUMENTS
62-281154 12/1987 lapan .
3- 260934 11/1991 lapan .
4- 121843 4/1992 lapan .
Primary Examiner—-William J. Klimowicz
Attorney, Agent, or Firm—Frishauf, Holtz, Goodman,
Langer & Chick
[57] ABSTRACT
An aberration correcting mechanism includes a corrective optical glass for correcting a spherical aberration and a link mechanism for movably supporting the corrective optical glass. The corrective optical glass is a parallel, flat plate having the same refractive index as that ol a cover glass of a disk, and its length is slightly greater than the moving distance of an objective. The link mechanism has first and second links. While one end of each of the links is rotatably attached to its corresponding end portion of the corrective optical glass, the other ends of the links are rotatably mounted on the mounting portions on a deck base. The link mechanism also has a third link and a solenoid, and one end of the third link is rotatably attached to the central portion of the second link, while the other end of the third link is rotatably attached to the solenoid. The solenoid is fixed to a fixed portion on the deck base.
2 Claims, 7 Drawing Sheets
