Vari-focal lens system

Details Vari-focal lens system Vari-focal lens system

1992-11-06

1994-11-01

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359686, G02B 1514

Patent

active

053611675

ABSTRACT:
A compact 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 positive refractive power and a third lens unit having a negative refractive power, and uses at least one radial type graded refractive index lens element arranged at the image side location in the second lens unit. The vari-focal lens system has a high vari-focal ratio and aberrations corrected favorably over the entire vari-focal range from the wide position to the tele position, and consists of a very small number of lens elements.

REFERENCES:
patent: 4673258 (1987-06-01), Masumoto
patent: 4726668 (1988-02-01), Nakayama et al.
patent: 4840467 (1989-06-01), Takada et al.
patent: 4952038 (1990-08-01), Ito
patent: 5069536 (1991-12-01), Ogata
patent: 5216547 (1993-06-01), Ogata

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