| 摘要 |
PURPOSE:To obtain a lighting apparatus having a large light emitting area by using a simple lens by decreasing the angle of reflected light with the optical axis with an increase in the angle of the light incident from a light source toward a reflecting face with the optical axis. CONSTITUTION:The prescribed relation is satisfied under the condition alpha>0 in the central part of a mirror face and under the condition alpha<=0 in the peripheral part among the angle theta of the light incident from a light source toward the reflecting face with the optical axis, the angle alpha of the reflected light with the optical axis and the luminous intensity I0 of the light source and such a reflection mirror face M which decreases the angle alpha with an increase in the angle theta is set. The set face M is rotated around the Z axis and the reflection mirror for a lighting apparatus is thus obtd. |
