| 摘要 |
<p>In the present invention, the front surface (14a) of a lens (14) is divided into 48 front-surface regions (14a1, 14a2, 14a3) by ridge lines (R1-R5), and the back surface (14b) of the lens (14) is divided into 48 back-surface regions (14b1, 14b2, 14b3) by trough lines (T1-T5). The back-surface regions (14b1, 14b2, 14b3) are formed at surface shapes set in a manner so that light radiated from a predetermined point (A) positioned on a light source (12) reaches each front-surface region (14a1, 14a2, 14a3) corresponding to each back-surface region (14b1, 14b2, 14b3) at regions towards the center separated inwards from the peripheral ridge lines.</p> |
