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. 21, 2009
Filed:
Jan. 26, 2006
Masashi Kitabayashi, Azmino, JP;
Masashi Kitabayashi, Azmino, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A manufacturing apparatus for manufacturing a projection optical system has a plurality of optical modulators, a color-combining optical device and a projection optical device. The manufacturing apparatus positions each of the optical modulators relative to the color-combining optical device and at a back-focus position of the projection optical device. The back-focus position is determined by calculating a deviation amount of the optical path length of a light beam from the optical modulator to the projection optical device based on the external dimensions of the color-combining optical device when the color-combining optical device is interposed between the optical modulator and the projection optical device.