Plate microlens and method for manufacturing the same

Details Plate microlens and method for manufacturing the same Plate microlens and method for manufacturing the same

1989-02-28

1990-08-28

Schor, Kenneth M.

65 3013, 350417, G02B 300, G02B 100

Patent

active

049520377

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:
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patent: 4509824 (1985-04-01), Yamasaki
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