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:
Dec. 12, 2000
Filed:
May. 17, 1999
Applicant:
Inventor:
Philip Rogers, Denbighshire, GB;
Assignee:
Pilkington PE Limited, Wales, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
359674 ; 359672 ;
Abstract
A switchable dual field of view objective system 20 comprises a front lens A and a rear lens C with an intermediate lens B switchable between in-use and out-of-use positions. Lens A is positively powered and lens C is negatively or positively powered but has little power in comparison to lens A. Lens C has two lens components 24, 25 of which component 24 is negatively powered and is located proximal to intermediate lens B. Lens B and component 24 are carried in common by a carrier 28 which is movable along the axis to provide distance focussing in both fields of view.