| 摘要 |
An optical pen comprises a housing, a pen body, a pen tip, a switch and a control unit. The pen body, disposed inside the housing, has a hinge mechanism allowing the pivoting of the pen body. The pen tip is disposed at a front end of the pen body and protruded from the housing. When the pen tip touches a projection surface, the pen body is rotated through the hinge mechanism to trigger the switch. The switch disposed inside the housing is electrically connected to the control unit. When the switch is triggered, the control unit outputs an electrical signal.
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