Light source device

Abstract

The invention provides a light source which can light an electric discharge lamp actually by enlarging radiation intensity of ultraviolet irradiating from an auxiliary lamp. The lamp source comprises: an electric discharge lamp (1), a pair of electrodes are disposed oppositely in a luminous tube (10), and mercury above 0.15mg / mm<3> is sealed therein; a reflection mirror (2) for surrounding the electric discharge lamp (1) and reflecting light irradiated by the electric discharge lamp; and an auxiliary lamp (4) irradiating ultraviolet when the electric discharge lamp starts, it is characterizedin: the auxiliary lamp has a tubular bulb (41), a pair of outer electrodes (42), (43) are disposed at the two terminals of the outer surface of the bulb (41), and a electric conductor (44) is disposed in the bulb (41), an electric conductor absent area (d) where no electric conductor is present in the tube axle direction is provided in the bulb not opposite to the outer electrodes (42), (43) of the auxiliary lamp (4).

Description

technical field [0001] The present invention relates to a light source device using a high-intensity discharge lamp as a high-pressure mercury discharge lamp, which is used as a light source for a projector, and particularly relates to its start-up characteristics. Background technique [0002] In a light source device such as a liquid crystal projector or a DLP projector, a high-intensity discharge lamp, which is a high-pressure mercury discharge lamp, is used as a light source, and a high-intensity discharge lamp that condenses the emitted light from the discharge lamp and reflects it to a front opening The reflective mirrors on the reflective surface are used in combination. [0003] When the discharge lamp is at a temperature around room temperature, the voltage required for insulation breakdown when the discharge lamp is started is generally thousands of volts. However, the voltage required for dielectric breakdown at the time of restarting varies depending on the elap...

AI Technical Summary

Problems solved by technology

[0024] The conductor 54 is provided opposite to the two external electrodes, the first external electrode 52 and the second external electrode 53, and straddled between the respective external electrodes. If a voltage is applied between 52 and 53, when the applied voltage is low, or when the external electrodes 52 and 53 are closed, although a discharge is generated in the area where the external electrodes 52 and 53 are opposite to the conductor 54, the discharge is maintained at the relative position. area without spreading to the overall situation within the bulb 51

[0025] At this time, even if the schematically shown discharge e occurs in the region where the external electrodes 52, 53 and the conductor 54 face each other, and ultraviolet rays are radiated from the discharge space, most of the emitted ultraviolet rays are blocked by the external electrodes 52, 53, and cannot effectively radiate outward from the bulb 51

[0026] As a result, the radiation intensity of ultraviolet rays radiated from the auxiliary lamp is weakened, and sufficient ultraviolet rays cannot be obtained to light the discharge lamp, and there is a problem that the discharge lamp cannot be turned on.

Images