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:
Jul. 12, 1988
Filed:
Aug. 10, 1987
Byung K Min, Los Altos, CA (US);
Charles H Wilson, San Jose, CA (US);
Other;
Abstract
An image projection system having a built-in mechanism for changing unframed transparencies comprises a frame, a source of illumination, a projection lens, a stage mounted to the frame for positioning a transparency thereon for view, delivery means for gripping and slidingly moving an unframed transparency along the surface of said stage, a magazine holding a stack of unframed transparencies for insertion into the frame adjacent to said stage, feed means for feeding the uppermost transparency from a stack of transparencies in the inserted magazine, and suitable drive means. A second magazine and second feed means can be included in the system for bedirectional changing of unframed transparencies. An electrical logic circuit interfacing with a control module can be included in the system for control. The mechanism for changing unframed transparencies can be isolated and built in a detached unit for use with a conventional image projector which does not have such a built-in mechanism.