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:
May. 14, 1991
Filed:
Sep. 21, 1989
Applicant:
Inventors:
Scott H Rumbaugh, Lake Oswego, OR (US);
Michael D Jones, Portland, OR (US);
Friedrich Scheu, Bend, OR (US);
Philip J Bos, Beaverton, OR (US);
Assignee:
Tektronix, Inc., Beaverton, OR (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ; C09K / ; C09K / ; G02F / ;
U.S. Cl.
CPC ...
350 9615 ; 350 9618 ; 350 9620 ; 350320 ; 3503 / ; 3503 / ; 428-1 ; 25229901 ; 252589 ;
Abstract
A polarization insensitive optical attenuator (10,40) uses a polymer-dispersed liquid crystal (PDLC) film (14,56) to provide attenuation control over a wide range of attenuation values. The attenuator has a relatively low minimum attenuation and reliable light transmission with minimal insertion loss. The present invention is also adaptable for use with a temperature controller (200) that stabilizes the PDLC film, which promotes more uniform, predictable attenuation values.