Optics: measuring and testing – Lens or reflective image former testing
Reexamination Certificate
2008-12-03
2009-10-27
Nguyen, Sang (Department: 2886)
Optics: measuring and testing
Lens or reflective image former testing
C356S124500, C250S201200, C382S103000, C382S275000, C359S811000
Reexamination Certificate
active
07609372
ABSTRACT:
A system for measuring a total track length of a telescopic lens includes a testing chart, a light source, a processor, a display screen and a range finder. The lens and an image sensor are received in a holder. The testing chart has a frame pattern and a plurality of line pair patterns. The testing chart faces and aligns with the image sensor for allowing the image sensor to capture an image of the testing chart. The processor analyzes the image generated by the image sensor, so as to obtain a modulation transfer function value representative of a precision focal position of the lens. The range finder measures a first distance between the image sensor and the range finder, a second distance between the lens and the range finder, and calculates a distance difference between the first and second distances to obtain the total track length of the lens.
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Chi Clifford O.
Hon Hai Precision Industry Co. Ltd.
Nguyen Sang
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