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:
Dec. 31, 1991
Filed:
Dec. 22, 1989
Masaaki Mandai, Tokyo, JP;
Seiko Instruments Inc., , JP;
Abstract
The present invention concerns a projection pad using a liquid crystal panel in which a transmission type liquid crystal panel is placed between a light source and a screen, and an image displace on the surface of the liquid crystal panel is displayed on a screen. In this type of the projection pad, energy of light projected from the light source is partially converted into heat energy at the inside of the projection pad, which increases the temperature of the projection pad thereby causing disadvantage such as liquefication of liquid crystals, abnormal operation of the panel controlling circuit, etc. It is, accordingly, necessary to provide an appropriate cooling mechanism to the inside of the projection pad. In the present invention, the structure of the cooling mechanism is adapted such that sufficient cooling effect can be obtained by an axial flow blower small in the size and reduced in the thickness thereby enabling to reduce the size and decrease the thickness of the projection pad itself.