| 摘要 |
PURPOSE:To improve light condensing efficiency by providing a through-hole in an axial direction to the shaft of a holotop driving motor, inserting a pipe therein without contact with said hole, fixing one end thereof to the outside, passing a laser beam for generating scanning light into the pipe and projecting the beam to a hologram. CONSTITUTION:The shaft 26 of the holotop driving motor 25 is made into a hollow shaft by providing the through-hole to said shaft in the axial direction thereof. The L-shaped pipe 27 is provided to the shaft so as not to contact with the inside wall thereof. Reflecting mirrors 28, 29 are respectively provided to the bent part of the pipe 27 and the optical path of the laser beam 30 for generating the scanning light is parallel moved by the mirrors 28, 29 to make incident the beam alternately to the holograms 22 and 23 when said beam is made incident from one end of the pipe 27. The generation of the scanning light 31, 32 is thus made possible.
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