Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1989-06-20
1992-08-04
Richardson, Robert L.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4416, 369 4419, 369 4422, 369244, G11B 700
Patent
active
051365588
ABSTRACT:
An optical disc player/recorder incorporates a laser, and an electromagnetically driven objective lens. The objective lens is mounted to a lensholder which is movable with respect to a base. A single pair of permanent magnets are mounted to the lensholder, and two pair of electromagnetic coils are mounted to the base. The coils and magnets are positioned such that one set of coils is collinear with the direction of magnetization of the permanent magnets and the other set of coils is perpendicular to the direction of magnetization of the magnets. Electromagnetic fields generated by the coils are used to move the objective lens in either a focus direction or a tracking direction. The magnets are mounted on the moveable objective lensholder, while the coils are attached in a heat-sink relationship to the fitted base. The objective lens rests on top of the objective lensholder which is suspended with respect to the base by a pair of flexures. A mirror is provided between the flexures to allow incoming laser light to enter from the side of the optical head, thereby reducing the total overall height of the system. A position sensor may be provided to detect the position of the lensholder, relative to the base of the two axis electromagnetic actuator.
REFERENCES:
patent: 4011003 (1977-03-01), Dragt
patent: 4449213 (1984-05-01), Noborimoto et al.
patent: 4504935 (1985-03-01), Jensen
patent: 4514837 (1985-04-01), Van Rosmalen
patent: 4568142 (1986-02-01), Iguma
patent: 4571026 (1986-02-01), Maruta
patent: 4596444 (1986-06-01), Ushida
patent: 4596448 (1986-06-01), Kikuchi
patent: 4643522 (1987-02-01), Takashima
patent: 4644516 (1987-02-01), Musha
patent: 4646283 (1987-02-01), Ito et al.
patent: 4669073 (1987-05-01), Wakabayashi et al.
patent: 4669823 (1987-06-01), Iguma et al.
patent: 4679904 (1987-07-01), Kurihara
patent: 4702555 (1987-10-01), Iguma et al.
patent: 4740946 (1988-04-01), Yumura et al.
patent: 4759005 (1988-07-01), Kasahara
patent: 4763314 (1988-08-01), McCaslin et al.
patent: 4794586 (1988-12-01), Korth
patent: 4811320 (1989-03-01), Kawasaki et al.
patent: 4823336 (1989-04-01), Inada et al.
patent: 4911534 (1990-03-01), Beyersbergen van Henegouwen
G. Boushuid, et al., Principles of Optical Disc Systems, Adam Hilger Ltd., Bristol, 1985, pp. 147-153.
Equichi, Naoya, et al., An 86 mm Magneto-Optical Disk Drive with a compact and fast-seek-time Optical Head, Optical Data Storage Conference, Vancouver, Mar., 1990.
Hitachi, Prototype Specification Sheet for a magneto-optical drive.
Kobori, et al., New Magnetooptic Head with a built-in Generator for a Bias Magnetic Field, Applied Optics, vol. 27, No. 4, Feb. 15, 1988, pp. 698-702.
Kobori, et al., Optical Data Storage Conference, Technical Digest Series, vol. 10, Mar. 11-13, 1987, pp. 186-189.
Sony, Product Brochure, SMO-501 Optical Disk Drive.
Yoshizumi, Keiichi, et al., Fast Access Actuator for Optical Disk Memory, SPIE, 1985.
Teruo Murakami, et al., "Magnetooptic Erasable Disk Memory with Two Optical Heads," Applied Optics, vol. 25, Nov. 15, 1986, pp. 3986-3989.
I. Sander, "Digital Magneto-Optic Storage System," Topical Meeting on Optical Data Storage, Jan. 20, 1983, pp. THA2-1-THA2-4.
M. Hartman, et al., "Erasable Magneto-Optical Recording Media", IEEE TransActions on Magnetic, vol. Mag.-20, Sep. 5, 1984, pp. 1013-1018.
Getreuer Kurt W.
Grassens Leonardus J.
Schell David L.
Applied Magnetics Corporation
Hindi Nabil
Richardson Robert L.
LandOfFree
Two axis electromagnetic actuator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Two axis electromagnetic actuator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two axis electromagnetic actuator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-784605