In one embodiment, the dichroic filter 206 is located between the meniscuslens 202 and the dome lens 204.
在一个实施例中，二向色滤光片206位于弯月透镜202与半圆状透镜204之间。
2
The third lens group (G3) comprises at least a negative meniscuslens (L33) and a positive lens (L32) sequentially from a side closest to images.
第3透镜组（G3），从最靠 像侧起依次至少具有负的弯月形的透镜（L33）、和正透镜（L32）。
3
The first stage of optical concentrator 200 is a meniscuslens 202 and the second stage is a dome lens 204, to which is mounted the wavelength converting element 110.