Patent ID: 8120764

Claim:
A tilt sensor with power-saving mechanism comprising: a light-emitting element located on a baseboard to emit light according to a first current in a working mode and to emit light according to a second current in a power-saving mode, wherein the second current is smaller than the first current; a blocking object displaceable in an accommodating space on the baseboard according to the gravity; at least two first light sensors located on the baseboard to sense a light amount according to the relative position of the light-emitting element and the blocking object to determine a tilt angle of the tilt sensor during the working mode; a second light sensor located on the baseboard to sense a light amount variation according to the relative position of the light-emitting element and the blocking object; and a control module, wherein when the light amount variation is larger than a specific value during the power-saving mode, the control module makes the light-emitting element work in a working mode, and when the light amount does not change or the light amount variation is smaller than a threshold value within a predetermined time period during the working mode, the control module makes the light-emitting element work in the power-saving mode.