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.:

US 8979275 B1

PDF
Full Text
Expired
Date of Patent:
Mar. 17, 2015

Filed:

Jun. 28, 2011
Applicants:

Jun Sakaguchi, Osaka, JP;

Syunsuke Ono, Osaka, JP;

Inventors:

Jun Sakaguchi, Osaka, JP;

Syunsuke Ono, Osaka, JP;

Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B 21/20 (2006.01); G03B 21/14 (2006.01);
U.S. Cl.
CPC ...
G03B 21/14 (2013.01); G03B 21/2013 (2013.01); G03B 21/2026 (2013.01); G03B 21/206 (2013.01);
Abstract

The projector uses two lamps, which are high-pressure discharge lamps with the same rated power, as light sources. The projector includes: a first alternating-current generator configured to generate a lamp current to be supplied to one of the lamps, based on an input control signal; a second alternating-current generator configured to generate a lamp current to be supplied to the other lamp, based on an input control signal; and a controller configured to control the lamp currents to have a same period and to be out of phase, by inputting a control signal to each of the first and the second alternating-current generators.


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Sakaguchi, Jun. (2015). Dual high-pressure discharge lamp projector with multi-waveform current generation for greater luminous flux change control and extended lamp life (U.S. Patent No. 8979275). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/8979275

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