Optics: measuring and testing – Lens or reflective image former testing
Reexamination Certificate
2005-11-02
2009-10-27
Nguyen, Sang (Department: 2886)
Optics: measuring and testing
Lens or reflective image former testing
C356S125000, C356S127000
Reexamination Certificate
active
07609371
ABSTRACT:
A lens meter for measuring optical characteristics of a lens to be measured includes a measurement optical system including a light source which projects a measurement light beam to the lens and a light receiving sensor which receives the measurement light beam having passed through the lens; an arithmetic part which obtains optical characteristic distribution of a predetermined measurement region of the lens based on a light reception result of the light receiving sensor; near-vision-portion determination means which determines whether a near vision portion of the lens is present in the measurement region based on the optical characteristic distribution in the measurement region; and detection means which detects presence of a non-optical region in addition to an optical region of the lens in the measurement region based on the light reception result of the light receiving sensor; the arithmetic part obtains additional power of the lens based on the optical characteristic distribution of the optical region in the measurement region when the near-vision-portion determination means does not determine the presence of the near vision portion in the measurement region and the detection means detects the presence of the non-optical region in the measurement region.
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Nguyen Sang
Nidek Co. Ltd.
Oliff & Berridg,e PLC
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