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:
Jun. 15, 2010
Filed:
Jul. 23, 2007
Junichi Shinohara, Yokohama, JP;
Junichi Shinohara, Yokohama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
In an image input device including a multistage aperture () which reduces a quantity of light by changing an aperture, and an ND filter () which reduces a quantity of light by changing transmittance of passing light, if ghosts tend to occur due to the second light reducing means, the generation of ghosts is effectively avoided. An object determining unit determines whether a strong light source is present on an object image formed by an optical unit () for imaging based on luminance distribution on the object image. The multistage aperture () and the ND filter () are controlled in order to obtain a proper exposure to pickup the object image. If the object determining unit determines which a strong light source is present on the object image, the ND filter (), which reduces the quantity of light by changing the transmittance of passing light, is used as less as possible, and the multistage aperture () is functioned preferentially.