Patent JPS554731A successfully refreshed from Google Patents.
← Back to Patent Explorer
JPS554731A Expired / Lapsed JP ⏱️ 0.0 years remaining

Write and read system of flexible magnetic disc device

Assignee: Fujitsu Ltd
•
Filing: 1978-06-23
•
Granted: —
•
Expires: 1998-06-23
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract PURPOSE:To reduce defacement and damage of the disc surface by rotating the magnetic disc only at an information write and read time. CONSTITUTION:When head 4 is brought into contact with a prescribed position of magnetic disc 5 and a power source is supplied, motor 6 is rotated. The rotation of this motor 6 is not transferred to disc 5 until electromagnetic clutch 7 becomes a connection state through electromagnetic clutch driver 8 by the control signal from host controller 1 according to information write and read, and disc 5 is rotated only at an information write and read time. As a result, defacement, damage, etc., of the disc surface can be reduced in comparison with a system where a head is loaded and unloaded to the rotating magnetic head.

Inventors

  • 👤 Kiyonori Tawara
  • 👤 Kenichi Chihara

Bibliographic Details

Application Number —
Jurisdiction JP
Data Source google_patents
Last Synchronized 2026-10-27 14:40
CPC Classifications
G; G11; G11B; G11B19/00; G11B19/20

Claims Analysis

Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag