Electronic apparatus having automatic lifting/lowering device

An electronic apparatus having an automatic lifting/lowering device comprising:

• a casing for burying inside an unspecified structure body at an installation site;
• wherein the casing comprises an upper opening forming a hollow with a rack gear inside the casing;
• a piston installed inside the casing comprising an electronic apparatus above the piston, wherein an electrical motor which is driven to move together with the electronic apparatus by a power source is installed at an appropriate location;
• wherein the electrical motor is coupled with the rack gear correspondingly;
• wherein
• the electrical motor moves together with an on/off power status of the electronic apparatus;
• when the power of the electronic apparatus is on, the electrical motor and the rack gear move oppositely, so as to make the electronic apparatus above the piston stretch outside the casing;
• wherein when the power of the electronic apparatus is off, the electrical motor makes relative motion in a reverse direction with the rack gear, so that the electronic apparatus of the piston is drawn back inside the casing.