Varifocal lens system

Details Varifocal lens system Varifocal lens system

1993-05-25

1995-05-23

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359691, 359689, 359686, 359683, G02B 1514

Patent

active

054186480

ABSTRACT:
A varifocal lens system consists of first and second lens groups arranged in this order from the image forming side. The first lens group consists of four lenses and has a negative refracting power and the second lens group consists of three lenses and has a positive refracting power. The varifocal lens system satisfies the following conditions wherein R.sub.i represents the radius of curvature of the i-th lens surface as consecutively numbered from the image forming side, d.sub.i represents the axial surface separation between the i-th lens surface and the (i+1)-th lens surface as consecutively numbered from the image forming side, .upsilon..sub.i represents the Abbe's number of the i-th lens as consecutively numbered from the image forming side, and .sub.II D represents the thickness of the second lens group:

REFERENCES:
patent: 4025167 (1977-05-01), Ikeda
patent: 4452513 (1984-06-01), Hamanishi
patent: 4468096 (1984-08-01), Hamanishi
patent: 4468097 (1984-08-01), Hamanishi
patent: 5155629 (1992-10-01), Ito et al.

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