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:
Apr. 07, 1992
Filed:
Sep. 07, 1990
Applicant:
Inventor:
Yoshikazu Kataoka, Kyoto, JP;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ;
U.S. Cl.
CPC ...
359674 ;
Abstract
An apochromatic lens system is corrected for chromatic aberration at three wavelengths. The apochromatic lens system includes a plane glass and a plane lens which are interchangeable with each other. When the plane glass is disposed on the optical axis of the lens system, the plane glass cooperates with the lens system to correct for chromatic aberration at first and second wavelengths. When the plane lens is disposed on the optical axis instead of the plane glass, the plane lens cooperates with the lens system to correct for chromatic aberration at the first wavelength and at a third wavelength.