Image projection lens

Details Image projection lens Image projection lens

1993-06-14

1994-10-18

Ben, Loha

Optical: systems and elements

Lens

With field curvature shaping

359714, 359764, G02B 1318, G02B 960

Patent

active

053573730

ABSTRACT:
A projection lens has a five-group structure, in which a first-group lens is a positive lens, a second-group lens is a negative lens, third- and fourth-group lenses are respectively positive lenses, and a fifth-group lens is a negative lens. The projection lens has a half view angle of 34.degree. or greater, and satisfies the following conditions: 0.04<d.sub.4 /f.sub.0 <0.08, 0.2<.phi..sub.1 <0.9, -0.6<.phi..sub.2 <0, 0.7<.phi..sub.3 <1.0, 0<.phi..sub.4 <0.5, and -1.36<.phi..sub.5 <-0.6, where: f.sub.0 : focal distance of the overall system, d.sub.4 : on-axis interval between the second-group lens and the third-group lens, .phi..sub.1 : power of the first-group lens, .phi..sub.2 : power of the second-group lens, .phi..sub.3 : power of the third-group lens, .phi..sub.4 : power of the fourth-group lens, and .phi..sub.5 : power of the fifth-group lens, (where .phi..sub.1 -.phi..sub.5 are respectively values obtained when the optical power of the overall system is set to 1).

REFERENCES:
patent: 4792217 (1988-12-01), Yoshioka

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