Discharge lamp device
AssigneeMatsushita Electric Works, Ltd.
InventorsMakoto Touho, Shigeaki Wada, Minoru Yamamoto
Life of this patent
Estimating the term…
Abstract
A discharge lamp device wherein discharging zone within a tubular discharge lamp is caused to exist as selectively biased with respect to the axis of the lamp to render the light distributing characteristic non-uniform in the circumferential direction of the lamp and, utilizing such biased discharging zone, a light of selective color or color tone dependent on a color or color tone determining material disposed along the biased zone is provided. The discharging zone biasing is realized specifically preferably by an electromagnetic means.
Claims31
A discharge lamp device including a lamp mounted to a socket means and having a coating of fluorescent material on the inside surface, said device comprising means for biasing a discharging zone generated inside said lamp to an area of a certain angle of rotation about the axis of the lamp, and means for shifting said biased discharging zone in circumferential directions with respect to the lamp axis, said biasing means comprising a magnetic field applied from the exterior to said lamp for rendering the magnitude of magnetism to be nonuniform in the section of the lamp, said biasing means further comprising a space separator disposed inside said lamp.
A discharge lamp device including a lamp mounted to a socket means and having a coating of fluorescent material on the inside surface, said device comprising means for biasing a discharging zone generated inside said lamp to an area of a certain angle of rotation about the axis of the lamp, and means for shifting said biased discharging zone in circumferential directions with respect to the lamp axis, said biasing means comprising a separator disposed within said lamp, said shifting means comprising a movable member provided to said separator such that said separator is shifted in response to movement of said movable member.
A discharge lamp device including a lamp mounted to a socket means and having a coating of fluorescent material on the inside surface, said device comprising means for biasing a discharging zone generated inside said lamp to an area of a certain angle of rotation about the axis of the lamp, and means for shifting said biased discharging zone in circumferential directions with respect to the lamp axis, said shifting means comprising means for axially rotatably holding said lamp.
A discharge lamp device including a lamp mounted to a socket means and having a coating of fluorescent material on the inside surface, said device comprising means for biasing a discharging zone generated inside said lamp to an area of a certain angle of rotation about the axis of the lamp, and means for shifting said biased discharging zone in circumferential directions with respect to the lamp axis, said socket means comprising a pair of socket pins, said biasing means comprising a separator disposed within said lamp, said biasing means further comprising a neighboring conductor member disposed along the periphery of said lamp and connected at one end to one of said socket pins, and shifting means comprising means for temporarily interrupting the applied voltage between opposing filaments at both ends of the lamp.
Dependencies are inferred from the claim text.