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1·In one embodiment, the dichroic filter 206 is located between the meniscus lens 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 meniscus lens (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 meniscus lens 202 and the second stage is a dome lens 204, to which is mounted the wavelength converting element 110.

光学集中器200的第一级是弯月透镜202且第二级是半圆状透镜204，波长转换元件110安装到该半圆状透镜204上。

4·The meniscus lens 202 May be manufactured from, e. g., BK7, B270, SF10, SF57 or F2 glass, sapphire, plastic, acrylic, silicone, epoxy, or any other suitable material capable.

弯月透镜202可由(例如)BK 7、B270、SF10、F57或F 2玻璃、蓝宝石、塑料、丙烯酸、硅酮、环氧树脂或任何其它可以的适当材料制造。