Lens refractometer

Details Lens refractometer Lens refractometer

1999-08-24

2000-11-14

Kim, Robert H.

Optics: measuring and testing

Refraction testing

356128, 356124, 356125, 359177, 359197, 359362, 359642, G01N 2141, G02B 520

Patent

active

061477516

ABSTRACT:
A refractometer and a method for measuring the refractive index of a lens, wherein a thin insert in the form of a pad of a flexible transparent material attached to a rigid transparent sheet, is lightly pressed onto a surface of the lens under test, such that the pad surface effectively acquires the same profile as the lens surface. The focal length or power of the lens is first measured without the insert, and the measurement is then repeated with the insert positioned first in contact with one surface of the lens, and then in contact with the other surface. The use of equations derived from the classical lens formula then enables the refractive index of the lens to be easily and quickly determined. The apparatus and method also enables the measurement of the refractive index of lenses of low power.

REFERENCES:
patent: 3985445 (1976-10-01), Tagnon
patent: 5151752 (1992-09-01), Oono
patent: 5847819 (1998-12-01), Yanagi
Derwent Abstract of DE 37 24 001 of Feb. 2, 1989.
Derwent Abstract of FR 2618552 of Jan. 27, 1989.

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