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. 30, 2008
Filed:
Jun. 02, 2006
Junichi Shida, Kanagawa, JP;
Suk-hwan Chung, Kanagawa, JP;
Shuichi Uryu, Kanagawa, JP;
The Japan Steel Works, Ltd., Tokyo, JP;
Abstract
Because a focal distance of a condenser lens is changed due to a change in temperature, when irradiation of a laser beam is restarted after the irradiation has stopped, it takes a long time to restore a temperature of the cooled lens to a given temperature, and the operating efficiency is deteriorated. A first mirrorthat can be located at a reflection position I at which an optical path is blocked and a laser beam a is reflected, and a second mirrorthat reflects the laser beam a which is reflected by the first mirrorare disposed between the condenser lensand the object to be irradiated. The first mirroris located at the reflection position I so that the laser beam a that is transmitted through the condenser lensis sequentially reflected by the first and second mirrorsand, and an intensity of the laser beam a that is again reflected by the first mirroris made to coincide with an intensity of the laser beam a that is reflected from the object to be irradiated, and the condenser lensis heated in the same manner that the processing laser beam a is transmitted through the condenser lensand irradiated on the object to be irradiated