Apparatus for measuring an optical characteristic of an examined

Details Apparatus for measuring an optical characteristic of an examined Apparatus for measuring an optical characteristic of an examined

1998-05-07

1999-02-16

Pham, Hoa Q.

Optics: measuring and testing

Lens or reflective image former testing

For optical transfer function

356127, G01B 900

Patent

active

058726250

ABSTRACT:
An apparatus for measuring an optical characteristic of an examined lens, comprising a first measuring optical system for projecting a first measuring light flux on an examined lens, which is enlarged so as to cover a relative large area of the lens, via both a first grating and a second grating which has a predetermined positional relationship with the first grating, thereby forming moire fringes thereon, then detecting the moire fringes by a two dimensional photo detector, a first calculating device for calculating each principle point refractive power at each point of the lens by processing results detected by the first measuring optical system, a second measuring optical system for projecting a second measuring light flux on a small area of the lens, then detecting a position of an image of the second measuring light flux by a positional photo-detector, a second calculating device for calculating a back vertex power at the small area by processing results detected by the second measuring optical system, and a display device for obtaining a distribution of each back vertex power at each point of the lens based on both the back vertex power and the each principle point refractive power, then displaying it graphically.

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