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. 07, 2015
Filed:
Nov. 16, 2010
Shigeru Okikawa, Tokyo, JP;
Tomoyoshi Abe, Tokyo, JP;
Shigeru Okikawa, Tokyo, JP;
Tomoyoshi Abe, Tokyo, JP;
KABUSHIKI KAISHA TOPCON, Tokyo, JP;
Abstract
A cam faceof a camhas a shape depending on the distribution of the light amount in the cross-section of reference light LR. When the camis rotated by a stepping motor, an abutmentmoves following the displacement of the cam facewith the rotation of the cam. A light-blocking linkrotates about the axis of rotationwith the movement of the abutment. A shieldmoves in a first direction with the rotation of the light-blocking linkto change the shielding region of the reference light LR. A light-blocking platecan shield the reference light LR from a second direction different from a shielding direction (first direction) by an attenuator. The light-blocking plateis moved by a drive mechanismand changes the shielding region.