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. 19, 1980
Filed:
May. 04, 1977
Norio Mizutani, Kawasaki, JP;
Soichi Nakamura, Kamakura, JP;
Nippon Kogaku K.K., Tokyo, JP;
Abstract
In a wide angle zoom lens system comprising a diverging lens group and a converging lens group which are both movable on the optical axis of the lens system to vary the air space between the two groups so that the magnification of the image is variable while the image plane is being maintained at a fixed position, the diverging lens group comprises, in order from the object side, a negative meniscus lens component convex to the object side, a positive lens component, a negative lens component, a positive meniscus lens component convex to the object side, the four lens components being separate from one another, and an air chamber having a converging effect being formed between the second and the third lens component, the third and the fourth lens component being so disposed that the air space therebetween is greater than the center thickness of the third member, and the converging lens group comprises at least four positive lens components a positive lens component out of which is closest to the object side and a positive lens component out of which is closest to the image side, and a negative lens component disposed among the at least four positive lens components, these five lens components being separate from one another.