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:
Jan. 08, 2002
Filed:
Oct. 28, 1998
Takaaki Yamazaki, Tokyo-to, JP;
Ken-ichiro Yoshino, Tokyo-to, JP;
Kabushiki Kaisha Topcon, Tokyo-to, JP;
Abstract
A beam position detector, which comprises a photodetection unit for receiving a laser beam and issuing a signal corresponding to photodetection amount, wherein said photodetection unit has a first photoelectric conversion unit and a second photoelectric conversion unit and width of said first photoelectric conversion unit is gradually decreased in positive position detecting direction, and width of said second photoelectric conversion unit is gradually increased in positive position detecting direction, and scanning position of the laser beam is detected by comparing the output value of said first photoelectric conversion unit with the output value of said second photoelectric conversion unit.