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. 05, 1989
Filed:
Oct. 21, 1988
Teruya Tanaka, Kanagawa, JP;
Katsuharu Matsuo, Aichi, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A temperature controller compares a temperature detection signal outputted from a temperature sensor with a set temperature preliminary set in a temperature setting circuit. According to a result of the comparison and before a zero-cross point of an AC voltage applied from a commercial AC source to a heating member, a driving circuit of the temperature controller outputs a driving signal to a thyristor to turn ON the thyristor at the zero-cross point. Then the AC voltage is applied to the heating member via the thyristor. Since the determination of turning ON or OFF the thyristor is made before the zero-cross point of the AC voltage applied through the thyristor, the thyristor may surely be turned ON or OFF at the zero-cross point to prevent electromagnetic wave noises from occurring.