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, 2018
Filed:
Aug. 01, 2016
Applicant:
Seiko Epson Corporation, Tokyo, JP;
Inventor:
Tomohiro Yokoo, Matsumoto, JP;
Assignee:
SEIKO EPSON CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B 21/20 (2006.01); H01J 61/073 (2006.01); H01J 61/26 (2006.01); H01J 61/33 (2006.01); H01J 61/86 (2006.01);
U.S. Cl.
CPC ...
G03B 21/2026 (2013.01); G03B 21/2053 (2013.01); H01J 61/0732 (2013.01); H01J 61/26 (2013.01); H01J 61/33 (2013.01); H01J 61/86 (2013.01);
Abstract
The disclosure relates to a discharge lamp including a light emitting tube having a discharge space therein, and a pair of electrodes disposed in the discharge space so as to be opposed to each other, wherein a changing rate of a cross-sectional area is equal to or lower than 200%. The changing rate is a rate of change of the cross-sectional area in every 0.25 mm in a direction along an optical axis of the light emitting tube. The cross-sectional area is an area of a plane perpendicular to the optical axis in a space between an outside shape of at least one of the pair of electrodes and an inside wall of the light emitting tube.