Optical: systems and elements – Lens – With variable magnification
Patent
1996-08-23
1998-08-25
Font, Frank G.
Optical: systems and elements
Lens
With variable magnification
359687, 359688, G02B 1514
Patent
active
057988722
ABSTRACT:
A zoom lens system composed, in order from the object side, of a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive or negative refractive power and a fourth lens unit having a positive refractive power; and configured to change a magnification thereof by moving the second lens unit and moving the fourth lens unit monotonously toward the object side from its location at a wide position to a tele position. A ratio of a focal length of the first lens unit relative to that of the fourth lens unit is defined within a specific range and a magnification of the fourth lens unit at the tele position is specified within a definite range.
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English abstract of Ono Japanese laid open appliction No. 3-237725, Sep. 1991.
English abstract of Uzawa Japanese laid open application No. 3-297060, Nov. 1991.
Font Frank G.
Olympus Optical Co,. Ltd.
Stafira Michael P.
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