| 摘要 |
PROBLEM TO BE SOLVED: To miniaturize the apparatus and to realize an accurate light quantity adjustment by arranging a mechanism with which adjusts the light quantity of a projection optical path is adjusted at the circumference of the optical path in a compact form. SOLUTION: A pair of light quantity adjustment plates 21a and 21b are arranged at the side edge parts opposing to each other at an optical path R through which the light from a light source A is projected, a driving means having a driving rotation shaft 33 and a transmission member 40 which transmits the revolution of the driving rotation shaft 33 to the light quantity adjustment plates 21a and 21b are provided. The pair of the light quantity adjustment plates 21a and 21b are so supported to turn in the advancing direction of the optical path on a pair of rotation supporting shafts 70 and 71 which are arranged approximately in parallel to each other on both side edges of the optical path. Further, the driving rotation shaft 33 is arranged approximate in parallel to the rotation supporting shafts 70 and 71. On the other hand, the transmission member 40 is arranged in a direction approximately orthogonal to the driving rotation shaft 33 and connected to transmit the drive of the driving rotation shaft 33 to the respective rotation supporting shafts 70 and 71. Further, the transmission member 40 is provided freely reciprocatingly in the directions approximately orthogonal to the pair of the rotation supporting shafts 70 and 71 and the transmission member 40 turns the rotation supporting shafts 70 and 71, respectively, by a specified amount by a reciprocal motion of the transmission member 40 by the driving rotation shaft 33. COPYRIGHT: (C)2006,JPO&NCIPI
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