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:
Jan. 20, 1987
Filed:
Sep. 24, 1985
Hitachi Denshi Kabushiki Kaisha, Tokyo, JP;
Abstract
An automatic iris adjustment system comprises a camera lens including an iris driving means for controlling the iris value; an image pickup element for converting the amount of light incident to the camera lens into an electrical signal; means for comparing the iris adjustment signal voltage V.sub.I from the image pickup element with the reference voltage V.sub.O to evaluate an error voltage V.sub.E (i.e., V.sub.E =V.sub.I -V.sub.O); means for calculating a varying component .DELTA.IRIS of iris control value as a predetermined function of the error voltage V.sub.E ; means for calculating an iris control value IRIS.sub.n basing on the calculated varying component .DELTA.IRIS of iris control value; and means for controlling the iris driving means in response to the calculated iris control value IRIS.sub.n.