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:
Dec. 25, 1984
Filed:
Sep. 16, 1982
Sadao Okudaira, Tokyo, JP;
Shigetada Sato, Tokyo, JP;
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A zoom lens comprising a first lens component having a positive refractive power, a second lens component having a negative refractive power, a third lens component having a negative refractive power, and a fourth lens component having a positive refractive power, the first through fourth lens components being arranged in order from an object. The first lens component comprises a focusing lens component composed of a composite lens having a first negative lens and a second positive lens, and a third positive-meniscus lens, the second lens component comprises a variator lens composed of fourth and fifth negative lenses and a sixth positive lens mainly for varying magnification, the third lens component comprises a compensator lens component composed of a seventh negative lens mainly for compensating for a variation of a focal point due to varied magnification, and the fourth lens component comprises a fixed master lens component composed of four or more positive lenses and two negative lenses with positive lenses disposed most closely to the object and an image, respectively.