| 摘要 |
A low f-number, single-element, catadioptric condenser lens (30) with four optical surfaces (21-24), which is capable of collecting light at large angles and large pupil diameters. Two of the four surfaces (22, 23) are reflective surfaces immersed in the lens refractive material (25), while the other two surfaces (21, 24) are refractive surfaces and fabricated on the surface of the lens. Two embodiments of the lens are disclosed; a low-obscuration type and a wide-field type. This condenser lens provides improved light collection efficiency overall and has lower obscuration in the center portion of the reformed light source (26), as well as improved optical aberration and stray light properties. The integration of the optical surfaces into a single package results in a more reliable and lower cost condenser lens.
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