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:
Jul. 26, 1994
Filed:
Jun. 29, 1992
Hideki Higashira, Ikoma, JP;
Koyo Seiko Co., Ltd., Osaka, JP;
Abstract
A system for controlling the temperature of a lamp annealer which system comprises a group of lamps for heating an article to be heated, a radiation thermometer for measuring the temperature of the article, and a lamp output conroller for controlling the output of the lamps based on the output of the thermometer, the controller having stored therein a target temperature control pattern. The system is adapted to effect open-loop control by controlling the lamp output according to a predetermined lamp output control pattern until the thermometer reaches a specified temperature range enabling closed-loop control and not lower than the lowest temperature measurable by the thermometer, to compare the gradient of temperatures measured by the thermometer with the gradient of the target temperature control pattern to determine the ratio of the former to the latter after the output of the thermometer has reached the temperature range, to continue the open-loop control while the gradient ratio is smaller than a predetermined control change-over reference value, and to perform closed-loop control by controlling the lamp output after the gradient ratio has increased to not smaller than the reference value so that the temperature measured matches the target temperature control pattern.