| 摘要 |
<p>PURPOSE: A ceiling type digital blackboard is provided to freely control height and an angle by a use purpose. CONSTITUTION: A lifting unit(220) comprises an upper arm, a joint part, and a lower arm. The upper arm includes the first pulley. The lower arm comprises a wire hanger. A digital blackboard(210) is connected to the lower arm. The digital blackboard displays an image corresponding to a lecture. A wire(270) is wound in a wire drum and the wire hanger.</p> |
