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:
Jul. 17, 1984
Filed:
Jul. 28, 1980
Sadao Okudaira, Saitama, JP;
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A zoom lens system in which aberration degradation due to focusing to a closer position, particularly a rapid increase in distortion of the focused image at the peripheral image field, is well compensated for. The lens system includes, from the object side, a first convergent lens component, a second convergent lens component, either a third convergent or divergent lens component and a fourth convergent lens component with the second and third components being movable for zooming. An afocal region is provided either in the space between the third and fourth lens components or within the fourth lens component.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile