Discharge lamp with light-intercepting film bands

Abstract

A discharge lamp which enables glare reduction, so that a lighting fixture can be simplified and reduced in weight. The discharge lamp includes an arc tube having a discharge space, a pair of electrodes having tips facing with each other within the discharge space, an outer tube enclosing the arc tube, a base that fixes one side of the outer tube, and two band-shaped light-intercepting films extending on a surface of the outer tube in the direction of the axis of the arc tube and in parallel with each other, wherein in at least one of the light-intercepting films, an extending portion is formed that extends on the side of the top of the outer tube with respect to the tip of the electrode within the discharge space and in the circumferential direction of the outer tube. Accordingly, unevenness in the intensity distribution of the light distribution pattern can be reduced, and generation of glare can be prevented. Furthermore, because it is not necessary to add a further mechanism for reducing glare such as a light-intercepting plate, a lighting fixture can be simplified and reduced in weight.

Dependencies are inferred from the claim text.