HIGH LUMINANCE ARC DISCHARGE LIGHT SOURCE UTILIZING MAGNETIC FIELD OR ELECTRIC FIELD FOR ARC POSITION CONTROL

摘要

PURPOSE: To permit a high luminance arc discharge by controlling the offset of an arc by the action of a magnetic field to be controlled, which is generated in an arc region so as to offset a portion of the arc. CONSTITUTION: An electromagnetic field B having a component perpendicular to an arc 14 is generated in a region of the arc 14, and the magnetic field B for offsetting a portion of the arc 14 is controlled to adjust the offset of the arc 14. When an arc lamp 20 is employed in an optical system, the offset of the arc 14 can be utilized to regulate a light beam direction, a light beam focus or a light beam intensity. Moreover, the arc lamp 20 can be activated by using a DC power source or an AC power source having a prescribed frequency, thus making possible a high intensity arc discharge.