Disc cartridge

Details Disc cartridge Disc cartridge

1992-07-28

1994-06-21

Look, Edward K.

Dynamic information storage or retrieval

Storage medium structure

Adjuncts or adapters

360133, 206444, G11B 3300, G11B 23033

Patent

active

053233824

ABSTRACT:
A disc cartridge for an optical disc having a magnetic member attached to a central portion of one of two major surfaces of a disc substrate, wherein the cartridge includes a cartridge main body rotatably accommodating the optical disc, a recessed, inner surface portion for keeping a clearance between an inner surface of the cartridge main body and a protuberance produced by attaching the magnetic member to the one of the two major surfaces of the disc substrate, a first lug formed at a first position on the inner surface of the cartridge main body facing the magnetic member and a second lug formed at a second position on the inner surface of the cartridge main body facing the one of the major surfaces of the optical disc, wherein the height of the first lug is less than the height of the second lug, such that the first lug is contacted by the magnetic member when the disc substrate is loaded onto a disc table inserted into the disc cartridge.
Recording/reproducing access apertures are formed in opposite positions of an upper cartridge half and a lower cartridge half making up the cartridge main body, and a reinforcement, including abutting projections and ribs, is provided at side edges of the recording/reproducing apertures located at an outer rim of an optical disc housed within the cartridge main body.

REFERENCES:
patent: 4794479 (1988-12-01), Nakanishi
patent: 4812937 (1989-03-01), Nemoto et al.
patent: 4851948 (1989-07-01), Kato et al.
patent: 4853925 (1989-08-01), Kaneuchi
patent: 4858050 (1989-08-01), Ashe et al.
patent: 4874085 (1989-10-01), Grobecker et al.
patent: 5034844 (1991-07-01), Shiba et al.
patent: 5043974 (1991-08-01), Nakagawa
patent: 5081556 (1992-01-01), Ikebe et al.
patent: 5084861 (1992-01-01), Takahashi
patent: 5111446 (1992-05-01), Fujita
patent: 5161081 (1992-11-01), Machida et al.
patent: 5175726 (1992-12-01), Imokawa
IBM Technical Disclosure Bulletin, vol. 24, No. 1A, Jun. 1981, p. 216; Henderson: "Flexible Disk Cartridge Arrangement".
IBM Technical Disclosure Bulletin, vol. 24, No. 1A, Jun. 1981, p. 216, Henderson: "Flexible Disk Cartridge Arrangement."
Patent Abstracts of Japan, vol. 13, No. 434 (M-875)(3782), Sep. 28, 1989 & JP-A-11 66 922 (Mitsubishi Metal Corp.).
Patent Abstracts of Japan, vol. 12, No. 113 (M-683), Apr. 9, 1988 & JP-A-62 240 521 (Matsushita Electric Ind. Co. Ltd.).

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