Write enable ring sensing arrangement for a magnetic tape reel

Details Write enable ring sensing arrangement for a magnetic tape reel Write enable ring sensing arrangement for a magnetic tape reel

1983-12-07

1989-02-07

Hecker, Stuart N.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Recording-or erasing-prevention

360132, G11B 1505, G11B 1506

Patent

active

048035696

ABSTRACT:
In order to be able to write in a magnetic tape inserted in a magnetic tape recorder, a write enable ring must be inserted on the rear of the magnetic tape reel. The presence and absence of the write enable ring is checked through the use of a sensing ring which is displaced in the axial direction when the tape reel having the write enable ring is put in place. At its exterior, the sensing ring has a surface in the axial direction having high reflectivity and contains a mark having low reflectivity. The presence and absence of the write enable ring is statically checked with an opto-electronic sensing element by sensing the surface having high reflectivity and dynamically checked by sensing the mark.

REFERENCES:
patent: 3417387 (1968-12-01), Rayfield
patent: 3688300 (1972-08-01), Whysong et al.
patent: 3772662 (1973-11-01), Blair
patent: 4063292 (1977-12-01), Karsh
patent: 4184180 (1980-01-01), Barton et al.

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