Operating device for e.g. glass ceramic-stove top, has cover with upper and lower sides, and evaluation device to evaluate amount of light received from light receiver and initiate switching operation depending on changes of quantity

摘要

The device has a cover (60) with an upper side (70) and a lower side (68), and a light transmitter (48) and a light receiver (50) under the cover. The transmitter emits light to the receiver, where amount of light from a deformation of the cover is changed. An evaluation device evaluates the amount received from the receiver and initiates a switching operation depending on the changes of the amount.