Switch device and electronic instruments equipped with the switch device

An electronic instrument provided with display means for displaying data and a lighting device for illuminating the display means, comprising:

• attitude-detecting switch means for detecting an attitude of the electronic instrument and for outputting a switch signal when the electronic instrument assumes a predetermined attitude;
• control data storing means for storing one of (i) operation control data for causing the lighting device to illuminate the display means, and (ii) non-operation control data for precluding the lighting device from illuminating the display means;
• determining means for determining whether the control data storing means has stored therein the operation control data or the non-operation control data;
• and
• illumination operation control means for (i) controlling the lighting device to illuminate the display means when (a) the attitude-detecting switch means outputs the switch signal, and (b) the determining means determines that the control data storing means has stored therein the operation control data, and (ii) for precluding the lighting device from illuminating the display means when the determining means determines that the control data storing means has stored therein non-operation control data.