Vari-focal lens system having graded refractive index lens

Details Vari-focal lens system having graded refractive index lens Vari-focal lens system having graded refractive index lens

1990-06-14

1992-05-26

Sugarman, Scott J.

Optical: systems and elements

Lens

With graded refractive index

359686, 359687, 359688, 359689, 359708, G02B 1514, G02B 1318

Patent

active

051173093

ABSTRACT:
A compact vari-focal lens system having a high vari-focal ratio, comprising a plurality of lens units including at least one lens unit having a positive refractive power and at least one lens unit having a negative refractive power, and adapted so as to change focal length thereof by moving one of said lens units along the optical axis, the lens unit arranged on the extremely object in said lens system having a positive refractive power and at least one radial GRIN lens being used in a negative lens unit.

REFERENCES:
patent: 4776697 (1988-10-01), Kamrat
patent: 4842386 (1989-06-01), Kitagishi et al.
patent: 4859040 (1989-08-01), Kitagishi et al.

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