| 摘要 |
PROBLEM TO BE SOLVED: To easily adjust a level and an elevation angle while viewing a projected image. SOLUTION: As for the device, in the case of rotating a rotary knob 1a so as to supply a driving force to a horizontal shaft, a screw gear installed on the other end of the horizontal shaft is rotated, then, a gear which is arranged on the vertical shaft so as to be engaged with the screw gear (a) is rotated, then, the vertical shaft is rotated, and the screw gear (b) at the leading end of the vertical shaft is rotated, and a female screw in the expansion part cylinder of an expansion leg 1b is engaged with the screw gear (b), then, the expansion leg 1b is moved in a vertical direction. For example, in the case of rotating the rotary knob 1a to the right, the expansion leg 1b is moved upwards, then, the expansion leg 1b is shortened.
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