Patent ID: 8801206

Claim:
A light-emitting knob mechanism to be disposed on a circuit board which is covered by an upper housing, the upper housing having a first opening in spatial communication with the external environment, said light-emitting knob mechanism comprising: an encoder to be disposed on the circuit board, and including a rotary rod, wherein said rotary rod protrudes out of the upper housing through the first opening, and rotatable about an axis thereof relative to the circuit board, rotation of said rotary rod triggering the circuit board to generate a control signal; a light guide unit including a lower light guide member and an upper light guide ring, wherein said lower light guide member is tightly sleeved on said encoder, protrudes out of the upper housing through the first opening, and has a second opening and at least one optical channel, said rotary rod of said encoder protruding out of said lower light guide member through said second opening, said upper light guide ring having a third opening, a light incident surface connected to said at least optical channel, and a light transmitting surface spaced apart from said light incident surface, said upper light guide ring being sleeved on said lower light guide member through said third opening; a knob engaged to said rotary rod that protrudes from said second opening of said lower light guide member, and operable to rotate said rotary rod so as to trigger the circuit board to generate the control signal; and a light emitting unit to be secured to the circuit board, and including alight emitting elements disposed adjacent to said encoder and capable of emitting light, wherein the light emitted from said light emitting element of said light emitting unit irradiates said lower light guide member, propagates through said at least one optical channel of said lower light guide member and is incident upon said light incident surface of said upper light guide ring, and is then transmitted out from said light transmitting surface in radial directions away from the axis.