Vari-focal lens system

Details Vari-focal lens system Vari-focal lens system

1991-06-07

1992-12-01

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359687, 359693, G02B 1514

Patent

active

051684020

ABSTRACT:
A vari-focal lens system comprising, in the order from the object side, 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 refractive power and a fourth lens unit; adapted to perform variation of focal length by moving the second lens unit and the third lens unit along the optical axis; and adapted to perform focusing by moving the second lens unit toward the object side.

REFERENCES:
patent: 4690513 (1987-09-01), Takahashi et al.
patent: 5009492 (1991-04-01), Hamano

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