| 摘要 |
PROBLEM TO BE SOLVED: To provide a lighting device of low power consumption which can be structured at low cost and can irradiate enough amount of light. SOLUTION: The lighting device 10 includes a top part 12a as a second lens face, a rear end face 12c, an outer periphery 12b of a cylindrical shape, a ceiling part 12e as a first lens face formed toward front from the rear end face, a bulk lens 12 having a recessed part 12d consisting of an inner periphery 12f of a cylindrical shape, a light source 11a arranged inside the recessed part 12d, a driving part 13 for driving a light-emitting part, a power source part 14, a switch part 15, and a case 16 containing the bulk lens, the light-emitting part, the driving part, and the power source part, and is so structured that light from the light source enters into an optical medium either from a ceiling part of the recessed part of the bulk lens or the inner periphery, is reflected directly or at the inner face of the outer periphery and then goes outward from the top part along the light axis direction, and at same time, the bulk lens is supported in free movement in the light axis direction against the light- emitting part. |
