Thus, an opening shape of the first integrator (11) can be optimally designed and light use efficiency can be improved.
由此，能够适当地设计第 1积分器（11）的开口形状，能够提高光的利用效率。
Thus, an opening shape of the first integrator (11) can be optimally designed and light use efficiency can be improved.
由此，能够适当地设计第 1积分器（11）的开口形状，能够提高光的利用效率。
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