Optics: measuring and testing – By configuration comparison – With photosensitive film or plate
Patent
1998-12-22
2000-04-25
Font, Frank G.
Optics: measuring and testing
By configuration comparison
With photosensitive film or plate
356380, G01B 1128
Patent
active
060550570
ABSTRACT:
A method and apparatus for detecting a scanning light beam used for writing onto a media. A detector is disposed in the scanning path for sending a signal to a first amplifier. A second amplifier is provided for providing a feed back loop to the first amplifier so as to maintain the first amplifier a predetermined level. A time delay circuit provided between the output of the second amplifier and first amplifier for delaying the signal from said second amplifier to said positive input of said first amplifier such that the output of the first amplifier is forced to a predetermined value when no signal is being produced by the detector.
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Eastman Kodak Company
Font Frank G.
Pincelli Frank
Ratiff Reginald A.
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