Optical: systems and elements – Lens – With variable magnification
Patent
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
Bey Dawn-Marie
Canon Kabushiki Kaisha
Epps Georgia Y.
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