| 摘要 |
PURPOSE:To obtain an inexpensive and bright zoom projector without the problem of parallex by making common an afocal zoom system to two master systems and disposing one rotatable original picture holding disk between the 1st master system and illuminating optical system and between the 2nd master system and original picture illuminating system. CONSTITUTION:A stop 10 and a beam splitter 3 are disposed between the rear of the afocal zoom lens group 1 and the lens group of the 1st master system 2. The branched optical axis is bent parallel with the optical axis X of the afocal zoom system 1 by a mirror 4 to an optical axis Y. The lens group of the 2nd master system 5 is disposed on the branched optical axis. The projecting original picture holding disk 8 has a revolving shaft parallel with the optical axes X' and Y between both axes and is rotated by a motor M1 for changing over the projecting original picture. High magnification projection is executed by the 1st master system 2 and the low magnification projection is executed by the 2nd master system 5.
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