Vari-focal lens system

Details Vari-focal lens system Vari-focal lens system

1990-03-14

1992-01-14

Dzierzynski, Paul M.

Optical: systems and elements

Lens

With graded refractive index

359686, G02B 1500

Patent

active

050804731

ABSTRACT:
A vari-focal lens system comprising a first lens unit having positive refractive power and arranged on the extremely object side, a second lens unit having negative refractive power and arranged on the image side of the first lens unit, and a rear lens unit having negative refractive power, at least one lens component arranged in the rear lens unit being designed as a negative graded refractive index lens.

REFERENCES:
patent: 4776679 (1988-10-01), Kitagishi et al.
patent: 4840467 (1989-06-01), Takada et al.

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