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:
Feb. 22, 2000
Filed:
Jul. 30, 1998
Applicant:
Inventor:
Yuka Adachi, Aichi-ken, JP;
Assignee:
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
359642 ; 359784 ;
Abstract
Disclosed is a reading lens consisting of one glass lens and first and second plastic lenses. A positive diffraction lens structure being is formed on one surface of the surfaces of the first and second plastic lenses. The positive diffraction lens structure functions at least to compensate a longitudinal chromatic aberration which is caused by refractive power of the glass lens and the first and second plastic lenses.