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( 12 a , 12 b ) therein, the discharge lamp( 11 ) having sealing portions( 14 a , 14 b ) formed on both ends thereof and a base( 15 ) fixed to the sealing portion( 14 b ), one of the sealing portions( 14 a , 14 b ); 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( 4 c ), the narrowest portion( 4 b ) is formed from the cylindrical portion( 4 c ) toward a reflective surface, and a portion continuing, while widening, from the narrowest portion( 4 b ) toward said reflective surface is formed by a molding surface( 4 a ).

1 . A short arc discharge lamp with a reflecting mirror including: a glass reflecting mirror formed by molding, said reflecting mirror having a reflective surface formed in conformity with an even-order function on an inner surface of said reflecting mirror; and a short arc discharge lamp sealing a pair of electrodes therein, said discharge lamp having sealing portions formed on both ends thereof and a base fixed to one of said sealing portions; wherein: said discharge lamp is disposed so as to agree with an optical axis of said reflecting mirror; and said base is fixed in an insertion aperture of a hollow neck-shaped portion formed at a center of a bottom portion of said reflecting mirror; said discharge lamp characterized in that: 
 a part of said inner surface of said insertion aperture of said hollow neck-shaped portion near said base is worked into a cylindrical portion, the narrowest portion is formed from the cylindrical portion toward a reflective surface, and a portion continuing, while widening, from the narrowest portion toward said reflective surface is formed by a molding surface.  
 
     
     
         2 . The short arc discharge lamp with a reflecting mirror according to  claim 1 , said discharge lamp characterized in that 
 said base of said discharge lamp is inserted into the cylindrical portion formed in said insertion aperture of said hollow neck-shaped portion of said reflecting mirror in a state capable of adjusting a position of said base freely; and    said base is fixed in said insertion aperture of said neck-shaped portion in a manner of preventing an inflow of an adhesive agent into the molding surface by preventing an outflow of said adhesive agent with the narrowest portion when said adhesive agent is poured into said insertion aperture of said neck-shaped portion.