Light source device

Abstract

The restart properties of a light source even under the condition of a hot restart is improved, and suppression of the danger of an insulation breakdown in an unintended area is achieved by a light source comprising a discharge lamp in which a pair of main discharge electrodes are located opposite a discharge space; an auxiliary electrode arranged such that it does not come into contact with the discharge space; a feed circuit that supplies a discharge current to the main discharge electrodes; and a starter that produces a high voltage between one of the main discharge electrodes and the auxiliary electrode, wherein, during a time interval during which the starter produces said high voltage, a high voltage is also applied to the main discharge electrodes at least during a portion of the time interval.

Description

technical field [0001] The invention relates to a light source device using a high-pressure mercury lamp, such as a high-pressure mercury lamp used as a projector light source. technical background [0002] High-intensity discharge lamps (HID lamps) are used as light sources for optical devices such as liquid crystal projectors and DLP projectors. [0003] However, in recent years, in order to increase the brightness of optical devices, it is desired to enclose a higher amount of mercury than conventionally in the discharge lamp. [0004] In such a discharge lamp, a starter must be used to generate a high voltage to break the insulation of the electric space and start the discharge. [0005] The structure of the traditional discharge lamp light source device is as follows: Figure 19 shown. In a light source device for an optical device, an initiator (Ui) that applies a high voltage between two electrodes (E1, E2) is generally used. In this way, since the secondary side c...

AI Technical Summary

Problems solved by technology

[0016] The present invention aims to solve the problems existing in the traditional technology, such as: in order to avoid heat loss in the coil, the volume and weight of the starter have to be increased, and it is difficult to restart when the discharge lamp is in a hot state after turning off the light for a short time problem, the problem of noise radiation, the problem of having to discharge too much energy from the starter to the feeder caused by the capacitive coupling between the feeder and the surrounding conductors, which increases the possibility of insulation breakdown in undesired parts and makes reliable sexual decline issues, etc.

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