The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 07, 1989
Filed:
Dec. 07, 1983
Siemens Aktiengesellschaft, Berlin and Munich, DE;
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.