Short-arch discharge lamp with reflection mirror

Abstract

To meet the requirements of the miniaturization of an apparatus and the enhancement of the efficiency of optical characteristics of an apparatus as a light source apparatus for a mobile liquid crystal projector. A short arc discharge lamp(11) with a reflecting mirror is composed of: a glass reflecting mirror(1) formed by molding, the reflecting mirror(1) having a reflective surface formed in conformity with an even-order function on the inner surface of the reflecting mirror(1); and a short arc discharge lamp(11) sealing a pair of electrodes(12a, 12b) therein, the discharge lamp(11) having sealing portions(14a, 14b) formed on both ends thereof and a base(15) fixed to the sealing portion(14b), one of the sealing portions(14a, 14b); wherein: the discharge lamp(11) is disposed so as to agree with the optical axis of the reflecting mirror(1); the base is fixed in an insertion aperture of a hollow neck-shaped portion(4) formed at the center of the bottom portion of the reflecting mirror(1); the discharge lamp(1) is characterized in that a part of said inner surface of said insertion aperture(3) of said hollow neck-shaped portion near said base is worked into a cylindrical portion(4c), the narrowest portion(4b) is formed from the cylindrical portion(4c) toward a reflective surface, and a portion continuing, while widening, from the narrowest portion(4b) toward said reflective surface is formed by a molding surface(4a).

Dependencies are inferred from the claim text.