To obtain the light utilization efficiency nearly in the same extent as when an original circular concave reflecting mirror is used without using a sub reflecting mirror and an auxiliary reflecting mirror even when a reflecting mirror is formed to be nearly rectangular by cutting off top and bottom of the circular concave reflecting mirror when viewed from an optical axis direction.
The lamp apparatus includes a high pressure discharge lamp (2) and a concave reflecting mirror (3). In the concave reflecting mirror (3), when two axes orthogonal to an optical axis (Z) are defined as an X-axis and a Y-axis, a peripheral surface of the reflecting mirror (3) is cut by two planes taking a Z-axis as a symmetry axis and parallel with a ZX plane, so that two arched notches (12A and 12B) are oppositely formed at portions where the peripheral surface of the reflecting mirror and the Y-axis cross with each other. On the outer peripheral surface of the light-emitting part (4) of the discharge lamp (2), prism surfaces (13A and 13B) refracting or reflecting the light toward a condensing area (SP) are formed to be symmetric with respect to the ZX plane at a portion crossing with the light flux radiated from a light-emitting part (4) to the notches (12A and 12B) within a predetermined angle range in the Y-axis direction.
II TAKASHI
KANO YOSUKE
HIGUCHI TOSHINAO
FUJII KOGAKU KK
| JP2006294268A | 2006-10-26 | |||
| JP2007073276A | 2007-03-22 | |||
| JP2006292903A | 2006-10-26 | |||
| JP2008112622A | 2008-05-15 | |||
| JP2004093653A | 2004-03-25 | |||
| JP2008112622A | 2008-05-15 | |||
| JP2004093653A | 2004-03-25 | |||
| JP2005070429A | 2005-03-17 | |||
| JP2006294268A | 2006-10-26 | |||
| JP2007073276A | 2007-03-22 | |||
| JP2006292903A | 2006-10-26 |
Akira Kawajiri