| 摘要 |
An illuminated display forming part of a twist type switch is disclosed. An operator display is formed from a transparent material having a high index of refraction. A cylindrical portion is formed on the back of the operator display which is mounted on the switch and defines a space in which an indicator lamp is mounted. A peripheral flange portion is formed forward of and radially outward from the cylindrical portion. The rear surface of the flange portion is contoured with a plurality of prisms which are arranged in the shape of the information to be displayed. The prisms concentrate and collimate the light emitting from the indicator lamp and passing through the cylindrical portion and direct it out the front of the operator display. The transverse cross section of the resulting beam is in the general shape of the display and is readily visible to an observer in front of the display.
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