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:
Feb. 17, 2015
Filed:
Jun. 26, 2014
Melles-griot, Rochester, NY (US);
Stanley W. Stephenson, Spencerport, NY (US);
Frank DeWitt, IV, Lima, NY (US);
Melles-Griot, Rochester, NY (US);
Abstract
An optical shutter apparatus has a shutter blade pivotable between first and second positions. The shutter blade in the first position blocks at least a portion of a light path. A stepper motor pivots the shutter blade to first or second positions. A magnetic shutter blade retention apparatus has a first movable member with a first surface, coupled to the shutter blade. A first stationary member is spaced apart from the shutter blade and is magnetically attracted to the first stationary member when the stepper motor is de-energized. When the shutter blade is pivoted to the first position, a point on the first surface is spaced apart from the first stationary member by a first distance; when the shutter blade is pivoted to the second position, the point on the first surface is spaced apart from the first stationary member by a second distance that is less than the first.