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:
Mar. 24, 1987
Filed:
Nov. 21, 1984
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
An optical system for a TTL automatic focusing video camera in which a beam splitter employed in the optical system is formed of at least two totally reflecting surfaces disposed on opposite sides of an optical axis of a main image pickup lens forming an angle with respect thereto of 90.degree. in the lateral direction and 45.degree. in the longitudinal direction., An abberation correction lens is arranged on opposite sides of the optical axis form the main image pickup lens. A light beam reflected and converged by a totally reflecting surface provided at a rear of the aberration correction lens is allowed to pass by the totally reflecting surfaces of the beam splitter to reach the automatic focusing sensor.