Recorders – Performance of multiple functions of steam and gas engines – Pressure responsive element
Patent
1987-02-24
1988-07-12
Broome, H.
Recorders
Performance of multiple functions of steam and gas engines
Pressure responsive element
346107R, 354 4, G01D 942
Patent
active
047573279
ABSTRACT:
A computer controlled photoplotter includes a row of LED's mounted to a light head positioned parallel to the film width. The light head is part of a light head assembly which is moved parallel to the film length. At the end of each pass the light head is indexed widthwise a short distance. During each lengthwise pass the LED's are illuminated at appropriate positions to expose the film at those positions according to the image being plotted. To equalize the illumination intensity of the LED's, the output of each LED is measured and the value is combined with a standard value. The result determining how long the LED is turned off during an intermediate segment of the actuation signal.
REFERENCES:
patent: 4096486 (1978-06-01), Pfeifer
patent: 4596995 (1986-06-01), Yamakawa
patent: 4661861 (1987-04-01), Rutherford
Broome H.
Lavenir Technology
Reinhart Mark
LandOfFree
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