| 摘要 |
PURPOSE: To correct lowering of light quantity in proportion to cos<4> θ with respect to an incident angle θ by a monocular lens of an LED head and correct widening of a beam diameter with respect to a light of the large incident angle θ. CONSTITUTION: An LED array 4, a monocular lens, and a slit 10 provided on a substrate 2 are set in an arrangement of l:1:1. A reflecting layer is provided in the slit 10. The width of the slit is made to be wide at the center of the array 2 and to be narrow at both ends of the array 2. |
