| 摘要 |
A push button switch having a self-indicating message display includes a push button capsule for being depressed into a housing for actuating a switch mounted in the housing. The push button capsule has a legend screen with a legend indicating use of the switch and a message screen for being displayed in the "on" position of the switch. The message screen fronts a shutter blade capsule mounted in the housing, and a pair of flexible shutter blades on opposite sides of the shutter blade capsule are curved toward one another over the message screen to black out the message when the switch is in the "off" position. The legend screen has light scattering capability that can black out the legend, when desired, and prevent reading the blacked out legend even in high ambient light conditions. The shutter blades are affixed to a movable lamp mounting base affixed to the push button capsule, and the shutter blades move down in response to the push button being depressed, to spread apart the shutter blades for exposing the message on the message screen to indicate the "on" position of the switch. The message screen is displayed without power supplied to lamps for illuminating the message, but the screen can be illuminated by back-lighting that is switched on when the push button is depressed. The legend also can be illuminated by back-lighting that is switched on when the switch is either in the "on" or "off" position.
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