Projection lens apparatus having a plurality of lens groups to p

Details Projection lens apparatus having a plurality of lens groups to p Projection lens apparatus having a plurality of lens groups to p

1994-06-20

1996-08-27

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

G02B 1514

Patent

active

055506798

ABSTRACT:
A projection lens apparatus has, in order from the side of a first conjugate point of a longer distance to the side of a second conjugate point of a shorter distance, a first lens group having a negative refracting power, a second lens group having a positive refracting power, and a third lens group having a positive refracting power. A focus change from a position of a short focus end to a long focus end is made by monotonously moving the first and second lens groups toward the first conjugate point.

REFERENCES:
patent: 4838666 (1989-06-01), Shiraishi

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