Patent ID: 8773008
Filing Date: 2014-07-08
Classification: H01J

Abstract:
1. A discharge lamp bulb comprising an arc tube including: an arc tube support plug including: a lead support wire extending outside the outer tube in the longitudinal direction and connecting one of the pair of lead wires with the arc tube support plug, wherein a front-end face at the front-end edge of the inner cylindrical section is substantially flush with a front-end face of the flange or is positioned on a back-end side with respect to the front-end face of the flange; an angle that is formed by a straight line passing through a luminescent center of the luminous tube of the arc tube and a front-end edge of the metal band of the arc tube and a straight line passing through the luminescent center of the luminous tube of the arc tube and perpendicular to a central axis of the luminous tube of the arc tube falls within a range from 60° to 75°.