Vari-focal lens system

Details Vari-focal lens system Vari-focal lens system

1998-10-22

2000-03-28

Dang, Hung Xuan

Optical: systems and elements

Lens

With graded refractive index

359676, G02B 300, G02B 1514

Patent

active

060439386

ABSTRACT:
A vari-focal lens system which comprises a plurality of lens units including a final lens unit having a positive refractive power, and uses at least a gradient index lens element which has a planar surface and another surface having curvature. This vari-focal lens system has a nearly telecentric composition, uses a small number of lens element in the final lens unit and is suited for use in electronic image pickup optical systems.

REFERENCES:
patent: 4976521 (1990-12-01), Ishii et al.
patent: 4998807 (1991-03-01), Uzawa et al.
patent: 5841586 (1998-11-01), Nagoka

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