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:
Jun. 24, 1997
Filed:
Nov. 29, 1994
Itaru Fukushima, Tokyo, JP;
Takashi Okamoto, Fukui, JP;
NEC Corporation, Tokyo, JP;
Susumu Co., Ltd., Fukui, JP;
Abstract
A thermal head apparatus includes a heat generation driving integrated circuit and a current detecting integrated circuit. The heat generation driving integrated circuit is constituted by a plurality of first switching elements respectively connected in series with current detecting resistors, a first shift register for serially inputting print input data for heating heat generation elements, a first latch circuit for latching the print input data input to the first shift register at a predetermined timing, and a first output gate circuit for selectively controlling energization of the first switching elements on the basis of the print input data latched by the first latch circuit. The current detecting integrated circuit is constituted by a plurality of second switching elements respectively connected to connection points between the heat generation elements and the current detecting resistors, a second shift register, a second latch circuit, and a second output gate circuit for selectively controlling energization of the second switching elements on the basis of the data latched by the second latch circuit, the current detecting integrated circuit outputting, as serial data, current detection data which energizes the second switching elements.