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:
Apr. 19, 2011
Filed:
Feb. 20, 2008
Fumio Watanabe, Ebina, JP;
Katsurou Bukawa, Ebina, JP;
Fumio Watanabe, Ebina, JP;
Katsurou Bukawa, Ebina, JP;
Hitachi Via Mechanics, Kanagawa, JP;
Abstract
There is provided a laser energy measuring unit whose laser energy measuring range is widened. The laser energy measuring unit has a filter provided within an optical path of a laser to attenuate energy of the laser, a calculating section for measuring the energy of the laser passing through the filter, and a condenser lens provided on one side of the filter for condensing the laser. The filter has a shading portion for blocking a center part of the laser beam from being transmitted through the filter at a position coincident with the center of the laser. The center part of the laser where its energy is large is cut by the shading portion, and the calculating section measures the part where its energy is not so large. Thereby, it is possible to widen the laser energy measuring range.