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:
Sep. 08, 1987
Filed:
May. 19, 1986
Yoshiyuki Morita, Tokyo, JP;
Seiko Instruments & Electronics Ltd., Tokyo, JP;
Abstract
In an electromagnetic induction type digitizer having a winding coil for generating magnetic field, a tablet having a plurality of conductive lines, a scanning circuit for detecting phase inversion of an induction signal induced on the conductive lines and counting means for counting the winding coil, the signal process circuit consists of an amplification circuit for amplifying the induction signal, a low pass filter for generating an envelope signal and a comparator for generating a load signal and the scanning circuit includes a decoder for controlling an analogue switch whereby a phase detector is eliminated and the signal process circuit becomes simple as compared with conventional signal process circuit.