Vari-focal lens system

Details Vari-focal lens system Vari-focal lens system

1991-05-09

1993-02-02

Arnold, Bruce Y.

Optical: systems and elements

Lens

With graded refractive index

359686, 359708, 359782, G02B 1318, G02B 1514

Patent

active

051842513

ABSTRACT:
A vari-focal lens system including, in the order from the object side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, an aperture stop, a third lens unit having a positive refractive power and a fourth lens unit having a negative refractive power; and using at least one radial GRIN lens element on each side of the aperture stop. This vari-focal lens system has only a very small number of lens elements and had favorably corrected aberrations.

REFERENCES:
patent: 4776679 (1988-10-01), Kitagishi et al.
patent: 4812021 (1989-03-01), Harrigan
patent: 4830476 (1989-05-01), Aoki
patent: 5117308 (1992-05-01), Tsuchida et al.
patent: 5117309 (1992-05-01), Aoki
Applied Optics, vol. 21, Mar. 15, 1982, "Design of a gradient-index photographic objective" L. G. Atkinson et al. pp. 993-998.

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