Method of making a plate microlens

Details Method of making a plate microlens Method of making a plate microlens

1990-11-21

1992-04-14

Schor, Kenneth M.

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 314, 65 301, 359619, 359652, G02B 300, G02B 100, C03C 2100

Patent

active

051044358

ABSTRACT:
In a plate microlens of the invention, wherein gradient index lenses each having an optical axis along a normal to a surface of a transparent base and a refractive index profile gradually changing along a direction of the optical axis and a direction perpendicular thereto are formed integrally in the transparent base; a ratio d/a (where d is a thickness of the gradient index lens on the optical axis and 2a is a diameter of the gradient index lens on a surface of the transparent base) falls within a range of 0.46 to 0.78. In a method for manufacturing a plate microlens of the invention, of forming integrally in a transparent base, gradient index lenses with a gradient index profile based on a concentration gradient of a substance for increasing the refractive index of the transparent base, by forming a diffusion preventive mask with predetermined apertures on a surface of the transparent base and diffusing the substance into the transparent base through the apertures; a ratio a/rm (where rm is a radius of the apertures and a is a radius of the gradient index lenses to be formed) satisfies a relation 1.75.ltoreq.a/rm.ltoreq.4.5.

REFERENCES:
patent: 3817730 (1974-06-01), Uchida
patent: 3879110 (1975-04-01), Furukawa
patent: 4076384 (1978-02-01), Deml et al.
patent: 4293188 (1981-10-01), McMahon
patent: 4296143 (1981-10-01), Franken
patent: 4380365 (1983-04-01), Gross
patent: 4457590 (1984-07-01), Moore
patent: 4509824 (1985-04-01), Yamasaki
patent: 4531810 (1985-07-01), Carlson

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