Optics: measuring and testing – Lens or reflective image former testing
Reexamination Certificate
2011-06-07
2011-06-07
Toatley, Gregory J (Department: 2877)
Optics: measuring and testing
Lens or reflective image former testing
C356S433000, C356S233000
Reexamination Certificate
active
07956994
ABSTRACT:
A measurement apparatus which measures a transmittance distribution of an optical system, comprises a light source, a first spherical mirror which forms reference light by reflecting light which is emitted by the light source and is not transmitted through the optical system, a second spherical mirror which forms test light by reflecting light which is emitted by the light source and is transmitted through the optical system, a measurement unit which measures intensity distributions of the reference light and the test light, a unit which calculates reflectance distributions of the first spherical mirror and the second spherical mirror, and an arithmetic unit which calculates a transmittance distribution on a pupil plane of the optical system, on the basis of the intensity distributions of the reference light and the test light, and the reflectance distributions of the first spherical mirror and the second spherical mirror.
REFERENCES:
patent: 6914680 (2005-07-01), Kawate
patent: 6937345 (2005-08-01), Kuramoto
patent: 2006/0170932 (2006-08-01), Hayashi et al.
patent: 2005-158828 (2005-06-01), None
Canon Kabushiki Kaisha
Canon U.S.A. Inc. I.P. Division
Slomski Rebecca C
Toatley Gregory J
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