Advertising poster board, has retaining device for replaceable accommodation of advertising poster and fastened to stand, and battery-operated lighting device with rechargeable battery and illuminant attached to battery
摘要
<p>The board has a retaining device (3) for replaceable accommodation of an advertising poster and fastened to a stand (4). A battery-operated lighting device (5) has a rechargeable battery (7) and an illuminant (6) attached to the battery, where the device has a power supply unit and a battery charger. A measuring instrument detects the environment brightness using a brightness sensor and provides an actual signal corresponding to the detected brightness. A comparison circuit compares the signal with a reference signal and switches on or off the illuminant in case of equality of the signals.</p>
