Abstract: An optical touch system and a touch point calculation method thereof are provided. The optical touch system includes a first lens, a second lens and a screen. The first and second lenses are disposed on the same side of the screen and face to the other side of the screen. In the method, images of a touch object above the screen are captured and used to calculate a first and a second touch signal of the touch object touching the screen before and after a preset time. Then, it is determined whether a width difference of the first and second touch signals exceeds a predetermined threshold. If yes, a third touch signal corresponding to the first touch signal relative to the second touch signal is calculated. Finally, positions of the first touch signal and the third touch signal are taken as locations of two touch points on the screen.

Abstract: A tape connecting apparatus for connecting a brass buckle to remaining and unused tapes, includes a support base, a platform, a support pillar, and a clamp device including a tape connecting base and a tape connecting clamp. The platform is disposed on the support base. The support pillar rotatably stands on the platform. The tape connecting base is detachably disposed at a top end of the support pillar. The tape connecting clamp has upper and lower handles respectively pivoted to the tape connecting base. The upper handle has a clamp head and is pivoted to the lower handle. When the brass buckle, the remaining tape and the unused tape are positioned on the tape connecting base, the upper and lower handles are rotated relatively to drive the clamp head to press the brass buckle, so that the unused tape could be connected to the remaining tape via the brass buckle.