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:
Oct. 13, 1987
Filed:
Dec. 02, 1985
Yasuomi Namiki, Yokohama, JP;
Victor Company of Japan, Ltd., Yokohama, JP;
Abstract
A magnetic head switching circuit for a magnetic recording and reproducing apparatus having a recording and reproducing magnetic head has three switching circuits. The first switching circuit is coupled between ground and one end of a winding of the head and controlled between conducting and non-conducting states in response to a voltage applied to a first control terminal. The second switching circuit has an output end, an input end coupled to a D.C. power source, and a second control terminal supplied with a mode switching signal for assuming a non-conducting state in the recording mode and assuming a conducting state in the reproducing mode to guide a voltage at the input end to the output end in response to the mode switching signal. The third switching circuit has an input end coupled to the output end of the second switching circuit and an output end coupled to the first control terminal. When the second switching circuit is in the conducting state, the third switching circuit guides a voltage at the input end of the third switching circuit to the output end of the third switching circuit so as to apply this voltage to the first control terminal and put the first switching circuit into the conducting state.