Patent ID: 6169367
Filing Date: 2001-01-02
Classification: H01J

Abstract:
A lamp bulb for a high pressure discharge lamp includes a pair of opposing electrodes that projects a predetermined distance into a discharge chamber, molybdenum foils, lead wires, and a bulb, the lamp bulb comprising: a discharge chamber filled with a metal halide and a rare gas, the discharge chamber including at least a concave surface curving inwardly with respect to a Z-axis of the high pressure discharge lamp; a discharge chamber portion surrounding the discharge chamber, including at least one convex surface curving outwardly with respect to the Z-axis of the high pressure discharge lamp; a center portion of the concave surface and convex surface corresponding to an approximate center between both electrodes, and existing on a vertical line to the Z axis indicating a front back direction of the light source; tapered portions tapering towards the discharge chamber; sealed ends in which are located the molybdenum foils, the electrodes, and the lead wires; and sealed portions substantially free from substantial curvature change, the sealed portions being located between the discharge chamber and the sealed ends.