Electronic device with unit for sending and receiving light

摘要

An electronic device comprises a body, an optical transceiver, and a first sensor. Wherein, the optical transceiver and the first sensor attaches to the body. The optical transceiver continuously emits optical signal and continuously receives reflection of emitted optical signals to determine a movement direction and a movement value. As the first sensor is touched and moved on the first sensor by hands, a vertical movement value is measured via change of capacitance value. The electronic device utilizes the optical transceiver to substitute the previous way which needs an external optical mouse to detect the movement. And the first sensor substitute the rolling wheel of previous optical mouse.