Light emitting push button switch for an electronic apparatus

Details Light emitting push button switch for an electronic apparatus Light emitting push button switch for an electronic apparatus

1989-01-13

1990-05-08

Sholl, Linda J.

Electricity: circuit makers and breakers

Electric switch details

Indicators

H01H 900

Patent

active

049240447

ABSTRACT:
A light emitting push button switch includes a button block moveable in an upward and downward direction responsive to a pushing force applied by an operator to thus alternately change the state of the switch from an ON-state to an OFF-state, a switching detector for detecting movement of the button block and a light source, e.g., a light emitting diode, for illuminating the bottom surface of the button block when the switch is in the ON-state. The button block includes a transparency block and a non-transparency block adhered to the transparency block. At least one portion of the rearwardly facing side of the transparency block gently slopes forward. When the switch is in the ON-state, the light source is activated and emits light which enters the transparency block. As the light enters the block, it is reflected by the rearwardly facing side of the transparency block and is guided to the top surface of the transparency block and radiated therefrom within a wide range. Thus, when an operator observes the top surface of the switch from an oblique angle, the radiated light is clearly visible.

REFERENCES:
patent: 3144643 (1964-08-01), Andersson
patent: 3780248 (1973-12-01), Martin
patent: 4104981 (1978-08-01), Ono et al.
patent: 4163883 (1979-08-01), Boulanger
patent: 4683359 (1987-07-01), Wojtanek

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