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US5993079A Iris diaphragm for high speed photographic printers 失效
虹膜光圈用于高速摄影打印机

Iris diaphragm for high speed photographic printers
摘要:
An iris diaphragm for selectively varying a diameter of an aperture, the iris diaphragm comprises at least two movable blades which are adaptable for forming the aperture; and a plurality of ceramic motors respectively attached to each one of the blades for causing said blades to vary the aperture formed therefrom.
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