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:
Nov. 18, 2014
Filed:
May. 24, 2012
Kunikazu Ohnishi, Yokosuka, JP;
Kunikazu Ohnishi, Yokosuka, JP;
Hitachi-LG Data Storage, Inc., Tokyo, JP;
Abstract
In a scanning image display device including a function to project and display a two-dimensional image on a projection screen using a deflecting unit that repeatedly operates a predetermined reflecting mirror surface to two-dimensionally scan a light beam, a large image distortion inevitably occurs, which is caused by the reflecting mirror surface that repeatedly and two-dimensionally operates for deflection. In order to solve the problem, a free-form surface lens or a wedge or trapezoid prism with a predetermined refractive index and a predetermined vertical angle is disposed in an optical path between the deflecting unit and the projection screen, thereby excellently correcting image distortion that occurs when scanning a light beam.