| 摘要 |
<p>PURPOSE: An overhead projector is provided to allow a person to easily express opinions using the overhead projector by converting a phase of the overhead projector printed on a file. CONSTITUTION: An overhead projector includes a body section(10) having a light source therein, a head section(20) for projecting an image of a file, and a support section(30) for supporting the head section(20) with respect to the body section(10) in such a manner that the head section(20) moves up and down relative to the body section(10). The head section(20) includes a head body(21), a rotating holder(22) rotatably installed with respect to the head body(21), a first dove prism, a second dove prism, a lens(23), and a reflective mirror(24).</p> |
