Vari-focal lens system

Details Vari-focal lens system Vari-focal lens system

1991-07-08

1993-03-23

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359654, 359689, G02B 1514

Patent

active

051969629

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 varifocal 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

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