Median point detecting apparatus for a lensmeter
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United States of America Patent
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May 11, 1982
Grant Date -
N/A
app pub date -
Mar 6, 1980
filing date -
Mar 6, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A lensmeter is disclosed for determining the refractive properties of a test lens, including an optical system to produce an ellipse of light at a detecting plane having information of such properties, a scanning linear photodiode array at the detecting plane for producing video output signals, a first integrator to integrate the video output signal from each photodiode, a compensator to compensate each video output signal for the light sensitivity of each photodiode, a second integrator to integrate the compensated video signals over the range of the distribution of light of an area of the ellipse being scanned, a circuit, connected to the second integrator, to detect the median point of the distribution, and a microprocessor to provide data identifying the median point in response to the detection.
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