Projection lens unit

Details Projection lens unit Projection lens unit

1994-06-15

1997-06-24

Epps, Georgia Y.

Optical: systems and elements

Lens

With field curvature shaping

359708, 359754, G02B 300

Patent

active

056422296

ABSTRACT:
A projection lens unit includes, in accordance with the order of disposition from a screen side, a first lens group including a positive meniscus lens, a second lens group including a double convex lens, and a third lens group which corrects curvature of field, wherein the third lens group has two concave lenses. A projection lens unit includes, in accordance with the order of disposition from a screen side, a first lens having a positive meniscus form, a second lens having a negative meniscus form, a third lens which is double-convex lens having a light gathering function, a fourth lens which is disposed near the third lens and is a double-convex lens having a positive power, a fifth lens provided at its central portion with a convex surface directed to a screen and provided at its peripheral portion with a concave portion directed to the screen, and a sixth lens having a concave surface directed to the screen, wherein each of the second, fourth and fifth lenses has at least one aspherical surface.

REFERENCES:
patent: 4300817 (1981-11-01), Betensky

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