| 摘要 |
Provided is a reflection mirror or the like, which has a reflection face capable of suppressing an electrode temperature rise due to a reflection light. A Z-Y orthogonal coordinate system is defined such that an axis common among the individual electrodes is a Z-axis, such that an axis extending through a middle point (C) between the electrodes and perpendicular to the Z-axis is a Y-axis, such that an intersection point, at which a reflection light reflected on an arbitrary reflection point of a reflection face after emitted from one point on the common axis, intersects the Z-axis, is a Z-coordinate, and such that the illuminance at that position is a Y-coordinate. In the Z-Y orthogonal coordinate system thus defined, the reflection face for reflecting a light emitted from a lamp toward the electrodes is so corrected, in case the individual illuminances and intersection positions of three reflection lights emitted from three points arranged in the first, second and third orders on the common axis between the electrodes and reflected on an arbitrary common reflection point on the reflection face are points (P1(Z1,Y1)), (P2(Z2,Y2)) and (P3(Z3,Y3)) on the coordinates, that the area Sp of the corresponding region portion between a pair of electrodes in the region defined by those three points and the Z-axis may be wide. |
