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. 28, 2014
Filed:
Sep. 12, 2009
Keiko Yamada, Sakai, JP;
Yoshie Shimizu, Ibaraki, JP;
Keiko Yamada, Sakai, JP;
Yoshie Shimizu, Ibaraki, JP;
Konica Minolta Holdings, Inc., Tokyo, JP;
Abstract
A video image display device () is provided with an ocular optical system () that guides video image light from a display element () to the pupil of an observer through an ocular prism () and at the same time guides ambient light to the pupil of the observer through the ocular prism (). The eyepiece optical system () has reflection planes set in the ocular prism () that are provided with three or more planes to fold down three or more times an optical path for the video image light from the display element (), wherein an HOE () is formed on at least one plane of the reflection planes. The video image display device () satisfies a conditional equation that properly prescribes the relationship between an incident range of the video image light incident on the HOE () formed plane in the ocular prism () and a display screen size of the display element (). Thus, the video image display device () can widely secure both a video image observation area and a see-through area with a small compact structure.