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:
May. 25, 2004
Filed:
Jun. 13, 2002
Applicant:
Inventors:
Assignee:
Benq Corporation, Taoyuan, TW;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F21V 7/00 ;
U.S. Cl.
CPC ...
F21V 7/00 ;
Abstract
A flash tube reflector able to distribute light of the flash tube evenly is disclosed. The reflector is a vertical portion of an elliptic cylinder extending along an Y-axis. A cross section of the reflector along the XY plane is a portion of an ellipse. A zenith E at the reflector intersects the X-axis. The flash tube contacts the reflector at E. A is a center of the flash tube and c is a distance between E and A. F is a first focus of the ellipse of the reflector and f is a distance between E and F . F is a second focus of the ellipse and f is a distance between E and F . The relations of c, f , and f are 0.20 ≦c/f ≦0.45 and 0.14≦f /f ≦1.0.