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:
Mar. 21, 2000
Filed:
Mar. 23, 1998
Applicant:
Inventor:
Michael P Schaub, Tucson, AZ (US);
Assignee:
Donnelly Optics, Tucson, AZ (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ; G02B / ;
U.S. Cl.
CPC ...
359565 ; 359571 ; 359716 ; 359740 ; 359784 ;
Abstract
A lens system having a reduced number of injection-molded singlet lens elements with at least one diffractive surface to control axial and lateral chromatic aberrations is disclosed. In one embodiment, the diffractive surface is placed on the first surface of the third lens, which is closest to the image plane. An opaque spacer provides suppression of stray light from reaching the image plane.