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. 15, 1998
Filed:
Mar. 07, 1996
Tetsuo Asaba, Odawara, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
The occupied area of a heater drive circuit of a recording head is reduced, and the number of manufacturing steps is decreased. As a circuitry of the heater drive unit, the final stage of the drive unit is constituted of a pnp or npn bipolar transistor, the heater, which is a load, is connected to the emitter side, and the collectors of each transistor are connected commonly to the base itself and grounded. The prestage of the drive unit is formed of the prestage of a MOS type element whose polarities are reversed to those of the final stage, i.e., an n-type MOS transistor with respect to the final stage of a pnp bipolar transistor and a p-type MOS transistor with respect to the final stage of a npn bipolar transistor, and the source of the prestage is grounded.