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:
Nov. 26, 1996
Filed:
Sep. 12, 1994
Motohisa Mouri, Yokohama, JP;
Nikon Corporation, Tokyo, JP;
Abstract
An underwater wide angle lens is provided, in succession from the object side, with a fore group comprising a first lens group having negative refractive power, a second lens group having negative refractive power, a third lens group having negative refractive power, and a fourth lens group having positive refractive power, and a rear group comprising a fifth lens group having positive refractive power and a sixth lens group having positive refractive power. Preferably, the fifth lens group and/or the sixth lens group is a cemented lens and focusing is effected by one or more of the second to sixth lens groups. Preferably each of the first lens group, the second lens group and the third lens group is a meniscus lens having its convex surface facing the object side.