| 摘要 |
An instrumental dial has a plurality of grooves defined in a front surface thereof. Each groove has a pair of side surfaces each comprising a pair of flat surfaces. The flat surface is closer to a rear surface of the instrumental dial than the flat surface. The flat surfaces are inclined by different angles theta1, theta2, respectively, to the direction in which the dial is visually recognized. The angles theta1, theta2 satisfy the relationship of theta1>theta2. The number of times that incoming light is reflected in the groove is increased to greatly reduce the amount of light that leaves the groove and also to disperse outgoing light in various directions. The instrumental dial thus has a novel look provided by a spinning pattern, and has a reduced reflectance for good visibility.
|
