| 摘要 |
PROBLEM TO BE SOLVED: To provide a lighting device having an operation knob 2 that controls uniform lighting through prevention of leakage of light in the periphery of the operation knob 2. SOLUTION: The lighting device with the operation knob is composed of constituents, which include a ring lighting material 3 to introduce the light to the lighting portion 3a positioned around the operation knob 2 through the light introducing portion 3c from the light collecting portion 3b, a light source 6 installed on the base board, a light introducing material 4 to introduce the light from the light source 6 to the light collecting portion 3c and a shield board 7 with a hole, to let the light pass to the light collecting portion 3b, which is arranged between the ring lighting material 3 and the light introducing portion 4. The diameter C of the hole of the shield board 7 is made smaller than the outer diameter A of the operation knob. |
