| 摘要 |
A rotatable knob for a control apparatus which is less complex than similar devices and which provides greater self-illumination than do similar devices. In the case of the present rotatable knob, a total reflection surface (13) is established wherein the obverse side (14) of the total reflection surface (13) forms a mantle of a conical or cup-shaped frustum upon which segment-like 90° prisms (16) are radially arranged. Accordingly, the present rotatable knob may be used in operational components for radios, air conditioning units, and the like in motor vehicles.
|
