CPC G02B 13/004 (2013.01) [G02B 1/041 (2013.01); G02B 9/34 (2013.01); G02B 13/0055 (2013.01); G02B 27/4205 (2013.01); G03B 21/2006 (2013.01)] | 16 Claims |
1. A projection lens, comprising:
a first lens with a positive refractive power, a second lens having a diffractive optical surface and a negative refractive power, and a third lens with a positive refractive power arranged in order from a magnified side to a minified side, a total number of lenses with refractive powers in the projection lens being smaller than six, and the first lens, the second lens and the third lens of the projection lens being aspheric lenses and made of plastic.
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