Importance

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Abstract

A lens for projection substantially consists of a negative first lens with its concave surface facing a reduction side, a positive second lens with its concave surface facing the reduction side, a negative third lens with its concave surface facing a magnification side, a positive fourth lens with its convex surface facing the reduction side, a positive fifth lens and a positive sixth lens in this order from the magnification side. The reduction side is telecentric. The following conditional formulas (1) and (2) about refractive power P4 of a reduction-side surface of the second lens, refractive power P5 of a magnification-side surface of the third lens, and focal length f of an entire system are satisfied:

description='In-line Formulae' end='lead'−3.0≦1/(P4×f)≦−0.4  (1); anddescription='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'−2.0≦1/(P5×f)≦−0.2  (2).description='In-line Formulae' end='tail'

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First Claim