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:
Dec. 24, 1996
Filed:
Apr. 18, 1995
Masafumi Shimotashiro, Katano, JP;
Akio Kuroe, Katano, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
In a magnetic recording and reproducing apparatus, a recording current setting circuit sets a recording current to be larger by 1 dB or more than a recording current which maximizes a reproduced signal level in correspondence to the shortest recording wavelength in digital signals to be recorded. Recording is performed with a magnetic head onto a metal powder tape including a magnetic layer of thickness having a 0.2 .mu.m or less. Thus, an overwrite characteristic can be obtained which are generally similar to that of a metal evaporation tape. Further, on reproduction, either an output from a equalizer circuit for a metal evaporation tape or an output from another equalizer circuit for a metal powder tape is selected by a switch circuit according to an output of a tape type detection circuit, and loop control gain of a tracking control circuit is changed according to the detected tape type. Thus, both metal powder tapes and metal evaporation tapes can be used.