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. 09, 1988
Filed:
Feb. 17, 1987
Applicant:
Inventors:
Keisuke Maeda, Sakai, JP;
Yoshinobu Kudo, Osaka, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354 64 ;
Abstract
A fixed focus amphibian camera comprises a foremost element of a taking lens group on a water tight camera body. The foremost element has a concave shaped surface on its front side. When the camera is used in water the refractive power of the concave shaped surface is reduced due to the difference in the refractive index between water and air, so that the subject distance that can be focused is shortened in water than in air.