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:
Apr. 16, 1991
Filed:
Dec. 15, 1989
Yasushi Hirumi, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
A signal generating circuit for generating gray scale signals for a thermal printer with a thermal head comprising a plurality of heating elements arrayed in a line, in such a manner that, even when white-level image data of a minimum or zero density is outputted, printing data adequate for slightly coloring a thermosensitive paper are obtained to prevent the occurrence of deterioration in the vicinity of the white label. The signal generating circuit includes a memory for storing image data to be printed, a PWM pulse driver for generating PWM driving pulses of the image data stored in the memory means, a zero-level pulse driver for generating a zero-level driving pulse, and a circuit for supplying the PWM driving pulses and the zero-level driving pulse to a thermal head drive circuit.