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Patent EP0097793A2 successfully refreshed from Google Patents.
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EP0097793A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Jacket for magnetic disk memory

Assignee: Shin-Etsu Polymer Co Ltd
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Filing: 1983-05-04
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Granted: —
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Expires: 2003-05-04
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Abstract

Abstract @ The invention provides an improvement in the structure of a jacket for a floppy disk-type magnetic disk memory. Different from conventional ones of bag-like form fabricated by two-fold folding of a plastic sheet followed by further folding of the peripheries and integral welding of the two leaves on the plane of the jacket, the inventive jacket comprises two separately shaped square covering sheet members each having the peripheries bent at right angle to form riser walls and engaged each with the other at the riser walls into a thin box-like form with the aid of inwardly raised projections at the corners of the covering sheet member serving as a spacer means so that the dimensional inaccuracy unavoidable in the folding work can be obviated. Further, the liners, which conventionally are integrally bonded by welding to the inside surface of the respective covering sheet, are provided separately from the covering sheet members so that the covering sheet members are free from thermal stress or distortion. A further improvement is obtained by providing the liner sheet with a peroipheral protrusion by which the liner sheet is manually or mechanically rotatable to provide a shutter means to the oblong side opening for recording and readout with a magnetic head.

Inventors

  • 👤 Atsushi Shiiba

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-04 19:03
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/03; G11B23/033; G11B23/0332

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 275 words
A jacket for floppy disk-type jacketed magnetic disk memory which comprises: (a) a pair of substantially rectangular covering sheet members made of a thermoplastic synthetic resin each having the peripheries bent approximately at right angle to form riser walls interengageable with the riser walls of the other covering sheet member when the covering sheet members are put together to form a thin box-like form, each covering sheet member being provided with a circular center opening to insert the driving shaft for rotating the magnetic disk and an oblong side opening for magnetic recording and readout with a magnetic head, at least either one of said covering sheet members being provided with at least one stepwise projection raised at the area near to one of the corners in the same direction as the riser walls, the side wall of the corner projection facing the center opening serving to define the space for the rotation of the magnetic disk, and the covering sheet members being engaged each with the other at the respective riser walls to be in a thin box-like form having a thickness defined by the said raised corner projection as a spacer means; and (b) a pair of liner sheets each having a liner layer and enveloped between the covering sheet members engaged in the thin box-like form with the liner layer facing inwardly to make a space for the magnetic disk between the liner layers, each liner sheet being provided with a circular center opening and an oblong side opening for magnetic recording and readout in conformity with the circular center openings and the oblong side openings in the covering sheet members, respectively.
Claim 2
Dependent Claim 275 words
A jacket for floppy disk-type jacketed magnetic disk memory which comprises: (a) a pair of substantially rectangular covering sheet members made of a thermoplastic synthetic resin each having the peripheries bent approximately at right angle to form riser walls interengageable with the riser walls of the other covering sheet member when the covering sheet members are put together to form a thin box-like form, each covering sheet member being provided with a circular center opening to insert the driving shaft for rotating the magnetic disk and an oblong side opening for magnetic recording and readout with a magnetic head, at least either one of said covering sheet members being provided with at least one stepwise projection raised at the area near to one of the corners in the same direction as the riser walls, the side wall of the corner projection facing the center opening serving to define the space for the rotation of the magnetic disk, and the covering sheet members being engaged each with the other at the respective riser walls to be in a thin box-like form having a thickness defined by the said raised corner projection as a spacer means; and (b) a pair of liner sheets each having a liner layer and enveloped between the covering sheet members engaged in the thin box-like form with the liner layer facing inwardly to make a space for the magnetic disk between the liner layers, each liner sheet being provided with a circular center opening and an oblong side opening for magnetic recording and readout in conformity with the circular center openings and the oblong side openings in the covering sheet members, respectively.
Claim 3
Dependent Claim 22 words
The jacket as claimed in claim 1 wherein each of the liner sheets is integrally bonded to the respective covering sheet member.
Claim 4
Dependent Claim 48 words
The jacket as claimed in claim 1 wherein each of the liner sheets is not integrally bonded to the respective covering sheet member but held at a fixed position by extending to the inside surface of the riser walls or the side walls of the raised corner projections.
Claim 5
Dependent Claim 22 words
The jacket as claimed in claim 1 wherein the liner sheet is made of a sheet of a non-woven fabric with rigidity.
Claim 6
Dependent Claim 28 words
The jacket as claimed in claim 1 wherein the liner sheet is made of a sheet of a non-woven fabric integrally bonded to a backup sheet with rigidity.
Claim 7
Dependent Claim 23 words
The jacket as claimed in claim 1 wherein the liner layer of the liner sheet is formed by flock-finishing on a backup sheet.
Claim 8
Dependent Claim 103 words
The jacket as claimed in claim 1 wherein the liner sheet has a circular form as a whole with a diameter to be in contact with the inward walls of the raised corner projections and is provided with a protrusion extending in the radial direction on the periphery in such a manner that the protrusion is protruded out of the covering sheet member and the liner sheet is rotatable by pushing the protrusion around the center axis whereby the oblong side opening in the liner sheet comes off the oblong side opening in the covering sheet member to provide a shutter means therefor.

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