Apparatus for adjusting a facsimile document scanner

Details Apparatus for adjusting a facsimile document scanner Apparatus for adjusting a facsimile document scanner

1982-04-15

1984-01-24

Britton, Howard

Facsimile and static presentation processing

Facsimile

Recording apparatus

358285, 358293, H04N 110

Patent

active

044279981

ABSTRACT:
A facsimile document scanner 10 is illustrated which includes an optical system 23 having a folded optical path 40 and an adjustable focusing lens 42. A test pattern 60 in the form of a plurality of alternate light and dark stripes 64, 66 is printed upon a strip 62 secured to the inner wall of the cabinet 12. When the scanner is at rest, the test pattern 60 is focused upon a linear photodiode array 50 mounted in an integrated circuit pack 51. The number of light and dark stripes 64, 66 is equal to the number of photodiodes in the linear photodiode array 50 across the document width. For adjustment purposes, an oscilloscope 70 is connected to a serial output from the integrated circuit pack 50 and the optical system 23 is adjusted to obtain a uniform signal display 80.

REFERENCES:
patent: 3584144 (1971-06-01), Shepard
patent: 4081842 (1978-03-01), Harbaugh
patent: 4318135 (1982-03-01), Allis
patent: 4358794 (1982-11-01), Kurakami

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