Lens meter utilizing three different wavelengths

Details Lens meter utilizing three different wavelengths Lens meter utilizing three different wavelengths

1997-04-21

1998-12-08

Font, Frank G.

Optics: measuring and testing

Lens or reflective image former testing

For optical transfer function

G01B 900

Patent

active

058478191

ABSTRACT:
A lens meter is provided which includes a light source portion (1) which emits measuring light (P) having at least three different wavelengths; a light receiving portion (3) which receives the measuring light (P) which has passed through a to-be-inspected lens immersed in a liquid (12) as a medium; an in-medium optical characteristic measuring device for measuring an optical characteristic of the lens (13) in the medium about each wavelength, based on a deviated quantity of the measuring light detected by the light receiving portion (3); a refractive index calculating device for calculating a refractive index of material of the lens (13), based on a difference of the optical characteristic of the lens in the medium among the wavelengths; and a converting device for converting the optical characteristic of the lens (13) in the medium into an optical characteristic of the lens (13) in the air, based on the refractive index calculated by the refractive index calculating device.

REFERENCES:
patent: 5719668 (1998-02-01), Oana et al.

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