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. 24, 2002
Filed:
Apr. 29, 1999
Koichi Ise, Chiba, JP;
Sony Corporation, Tokyo, JP;
Abstract
A light controlling apparatus comprises a GH cell and a polarizing plate. The polarizing plate is attached to an iris blade, and movable inside/outside the effective optical path of the light incident to the GH cell. The iris blades are driven by a motor not shown in the drawing to overlap each other, and at the time, the polarizing plate is moved inside the effective optical path to cover the aperture. If the brightness of an object increases more, the GH cell absorbs the light to control the light. Because the polarizing plate is movable outside the effective optical path of the light, the light is not absorbed by the polarizing plate, and the maximum transmittance of the light controlling apparatus is increased, therefore the contrast ratio is increased and the light quantity is maintained uniform.