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. 21, 2003
Filed:
Jan. 10, 2000
Jacob Moskovich, Cincinnati, OH (US);
U.S. Precision Lens Incorporated, Cincinnati, OH (US);
Abstract
Projection lens systems for use in CRT projection televisions are provided. The lens systems include a negative lens unit (U ) which is associated with the CRT during use of the lens system and four lens elements (L , L , L , CR) on the image side of the negative lens unit (U ). Three of those lens elements (L , L , L ) are arranged as follows from the long conjugate to the short conjugate of the lens system: a first lens element (L ) which has a weak optical power and at least one aspherical surface; a second lens element (L ) which has a positive focal length and provides most of the optical power of the lens system; and a third lens element (L ) which has a positive focal length and at least one aspherical surface. The last lens element of the system is a corrector lens element (CR) which is located adjacent to the second lens element (L ) and has a weak optical power, at least one aspherical surface, and is substantially flat. The lens systems achieve wide fields of view, low f-numbers, and low levels of thermal focus drift.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile