Disk cartridge with shutter and stock roll therefor

Details Disk cartridge with shutter and stock roll therefor Disk cartridge with shutter and stock roll therefor

1996-02-08

1998-11-10

Levy, Stuart S.

Dynamic magnetic information storage or retrieval

Record medium

In container

369291, 148537, 428467, G11B 2303, B32B 1504

Patent

active

058353186

ABSTRACT:
A disk cartridge is formed with a slidably mounted metallic shutter for opening and closing a disk access opening formed in the cartridge shell. A stock roll material for forming the shutter is formed of a sheet of metallic base material, such as aluminum, to which upper and lower film layer are applied. The upper film layer is formed of synthetic resin including a lubricant component and a coloring agent while the lower film layer is formed of a synthetic resin which is harder than that of the first film layer and to which no lubricant or coloring is added. The stock material is introduced to punching and bending processing apparatus such that the upper lubricant containing film layer contacts the punch die such that press oil need not be used during fabrication. Bending processing is carried out such that a U-shaped shutter is formed having the lubricant containing film layer at an inner surface thereof, and the harder lower film layer forms the outer surface. Thus, the outer surface resists abrasion and flawing and may be printed upon with good results, while the inner lubricated layer assures smooth sliding of the shutter and eliminates the need for applying and removing press oil during manufacture. The color applied to the lubricated film layer assures that the stock may always be correctly oriented at the initial stage of processing.

REFERENCES:
patent: 5293294 (1994-03-01), Chappell
patent: 5308709 (1994-05-01), Ogino et al.
patent: 5512111 (1996-04-01), Tahara et al.
patent: 5527606 (1996-06-01), Kikuchi
Patent Abstracts of Japan, vol. 016, No. 491 (p-1434), Oct. 12, 1992, & JP-A-04 176070 (Mitsubishi Materials Corp). Jun. 23, 1992.
Patent Abstracts of Japan, vol. 014, No. 064 (p-1002), Feb. 6, 1990 & JP-A-01 286190 (Canon Inc.), Nov. 17, 1989.

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