| 摘要 |
The invention relates to an electronic device, especially a car radio, comprising a microprocessor (1) and operator buttons (12, 13) which can be illuminated by light sources (7, 8). The functions of illumination and detection of the operating status of the operator buttons (12, 13) are associated with each other as follows: the light sources (7, 8) can be successively, cyclically supplied with control pulses as controlled by the microprocessor (1). Each operator button (12, 13) has a light receiver arrangement (15, 17, 19) which can be optically connected to the light source (7, 8). The optical connection between the light receiver arrangement (15, 17, 19) and the light source (7, 8) can be modified by the activation of the corresponding operator button (12, 13) and the microprocessor (1) is initialised for the allocation of the output signals of the light receiver arrangements (15, 17, 19) to the cyclically emitted pulses.
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