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:
Sep. 12, 1978
Filed:
Mar. 16, 1977
Applicant:
Inventors:
Hiroshi Koike, Minami-Azabu, Minato-ku, Tokyo, JP;
Shoji Suzuki, Satagaya, Setagaya-ku, Tokyo, JP;
Takeki Asakawa, Taisei-cho, Ohmiya City, Saitama Prefecture, JP;
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05D / ;
U.S. Cl.
CPC ...
350269 ; 250229 ; 350315 ; 354271 ; 354274 ;
Abstract
An automatic diaphragm assembly for use in an optical or optoelectronic image pick-up device having lens systems, comprising diaphragm blades forming a variable aperture, at least one neutral-density filter element movable with one of the diaphragm blades, and an electromagnetic drive unit including a ring-shaped permanent magnet having locally magnetized pole portions alternately disposed circumferentially of the magnet and a ferromagnetic ring forming a circular air gap between the permanent magnet and the ferromagnetic ring.