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:
Apr. 24, 1990
Filed:
Apr. 14, 1989
Masanori Ogino, Yokohama, JP;
Hiroshi Kaiwa, Tokyo, JP;
Yoshiaki Iwahara, Yokosuka, JP;
Yuzo Tamura, Yokohama, JP;
Akio Yamamoto, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A multi-screen projector composed of a plurality of unit module projectors piled up one upon another in the vertical direction. Each unit module projector includes a Fresnel lens sheet, lenticular sheet, and prism sheet interposed therebetween such that a light is incident to the Fresnel lens sheet and outputted from the lenticular sheet. The prism angle of the prism sheet of the unit module projector disposed at a higher position is set larger than that disposed at a lower position, and the main output light from the prism sheet is made at least parallel with the incident light direction or deflected downward relative to the incident light direction.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile