| 摘要 |
A slit apparatus has a rotatable base plate and a rotatable cam driving plate which are rotated about the same axis of rotation, but independently. The base plate is provided with slit blades for forming a slit therebetween. The slit blades are rotated together with the base plate and therefore the direction of the slit is changed. The cam driving plate is provided with a cam plate for changing slit width. The slit width is changed by rotation of the cam driving plate. A slit direction adjusting knob for driving the base plate is arranged to be coaxial with a slit width adjusting knob for driving the cam driving plate.
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