Tactile switch for a domestic appliance having a controller...

Details Tactile switch for a domestic appliance having a controller... Tactile switch for a domestic appliance having a controller...

2008-08-06

2009-11-17

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S221000

Reexamination Certificate

active

07619206

ABSTRACT:
A switch for a domestic appliance, such as a cooking range, that includes a radiation emitter, an auxiliary radiation emitter and a radiation receiver, the radiation receiver adapted to receive at least part of the radiation emitted from the radiation emitter and auxiliary radiation emitter and to generate one or more reception signals whose values depend on the radiation received. A controller associated with the switch generates a periodic control pulse (Pc) at a first time interval to cause the radiation emitter to emit radiation for a duration of time and a periodic test pulse (Pt) at a second time interval different than the first time interval to cause the auxiliary radiation emitter to emit radiation for a duration of time. The controller configured to evaluate the one or more reception signals to determine if an error or malfunction exists in the switch.

REFERENCES:
patent: 5319205 (1994-06-01), Kline et al.
patent: 2006/0282070 (2006-12-01), Arnold

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