本发明是借助中间像浸没的技术，增大反射角、减小直光管芯径，缩短直光管的长度。
By means of intermediate image immersing technology, the present invention has increased reflection Angle, reduced straight collimator core diameter and shortened straight collimator length.
本发明的最大优点是缩短了光学组件的长度，有利于降低直光管的制造难度。
The major advantages of the present invention include shortened optical assembly length and easy manufacture of the straight collimator.
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