Projection lens

Details Projection lens Projection lens

1998-01-29

1999-12-28

Epps, Georgia

Optical: systems and elements

Lens

With field curvature shaping

359649, G02B 300

Patent

active

060089504

ABSTRACT:
A first lens group U1 having a positive optical power, a second lens group U2 having a negative optical power and a third lens group U3 having a negative optical power are disposed in the order from a screen end. For focusing action, the first lens group U1 and the second lens group U2 respectively move in a same direction for different quantities, while the third lens group U3 remains fixed. The aperture ratio of projection lens as a whole is 1:1.1, the magnification of projection is in a range of -0.025 to 0.100.

REFERENCES:
patent: 4767199 (1988-08-01), Yamamoto et al.
patent: 4776682 (1988-10-01), Hosoya
patent: 4792218 (1988-12-01), Nakajima et al.
patent: 5066113 (1991-11-01), Nakajima et al.

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