Spherical lens for spherically symmetrical graded refractive ind

Details Spherical lens for spherically symmetrical graded refractive ind Spherical lens for spherically symmetrical graded refractive ind

1982-03-26

1985-12-10

Corbin, John K.

350 9619, 350416, G02B 514, G02B 516, G02B 902

Patent

active

045575665

ABSTRACT:
A spherical lens of graded refractive index distribution comprises a core of uneven refractive index of the shape of a sphere or hemisphere and a clad of the shape of a spherical shell and a rod clad, with the two clads disposed on the periphery of the core. By the combination of the core showing negative aberration characteristic and the spherical-shell type clad and the rod clad both showing positive aberration characteristic, there can be formed a lens of corrected aberration. This lens suits combination or integration with other elements and permits easy manufacture of clads. It also provides effective convergence of beams of light desirable for use in an optical pickup, for example.

REFERENCES:
patent: 2273847 (1942-02-01), Eckel
patent: 3666347 (1972-05-01), Kitano et al.
patent: 4268112 (1981-05-01), Peterson
patent: 4327963 (1982-05-01), Khoe et al.
patent: 4422733 (1983-12-01), Kikuchi et al.

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