Portable Electronic Device

A portable electronic device, comprising:

• a tablet PC comprising a touch screen;
• a base panel;
• two supports, each of the supports comprises a first end and a second end which are oppositely arranged with each other;
• two first pivotal portions in which the first ends are respectively pivoted on two opposite lateral surfaces of the tablet PC through the first pivotal portions;
• two second pivotal portions in which the second ends are respectively pivoted on two opposite lateral surfaces of the base panel through the second pivotal portions, and each of the second pivotal portions comprises:
• a shaft rod having one end thereof fastened on the second end of one of the supports;
• a retractable spring sleeved on the shaft rod;
• a three-peak fixed cam sleeved on the shaft rod, fastened on the base panel, wherein the three-peak fixed cam comprises three first peaks spaced with equal intervals, and a first cave is formed between every two of the first peaks;
• and
• a three-peak rotary cam sleeved on the shaft rod, rotated along the supports, and two ends of the three-peak rotary cam being respectively abutted against the three-peak fixed cam and the retractable spring, wherein the three-peak rotary cam comprises three second peaks spaced with equal intervals, and a second cave is formed between every two of the second peaks,
• wherein when the tablet PC is stacked on the base panel, the second peaks respectively abuts against the first peaks to compress the retractable spring,
• when the retractable spring pushes the second peaks to be respectively received into and abutted against the first caves, the tablet PC stands on the base panel, and an included angle being in a range of 50 to 60 degrees is formed between the base panel and each of the supports.