Flying spot image scanner that utilizes a CRT coupled to a nonco

Details Flying spot image scanner that utilizes a CRT coupled to a nonco Flying spot image scanner that utilizes a CRT coupled to a nonco

1989-03-17

1990-04-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

358484, 25022728, H01J 516, H01J 4014

Patent

active

049183044

ABSTRACT:
An image scanner utilizes an area CRT while avoiding the low linear resolution limitations of such a device. The CRT is coupled to a noncoherent fiber optic bundle (area array) having a proximal end of a geometry to optically match the scanned area of the face plate. The remote end of the fiber array is linear and coupled to a scan segment of a page to be scanned. The beam of the CRT is directed to the consecutive fibers of the bundle in a sequence imposed by a look-up table containing digital addresses and digital to analog converters to produce the required x-y deflection voltages. Since there need only be 5100 fibers for a 600 line per inch scanner and the spot resolution of the CRT need only be in excess of 5100 positions, the resolution is easily obtained. For example, 5100 spots implies a linear resolution of 72 elements in a scan line. The decay time of the phosphor is chosen to be short enough that only one fiber is illuminated at any instant. A single output photodetector is used for monochrome and a three output photodetector is used for color.

REFERENCES:
patent: 3840701 (1974-10-01), Tomii et al.
patent: 4390903 (1983-06-01), Pomeroy
patent: 4454547 (1984-06-01), Yip et al.
patent: 4528593 (1985-07-01), Nicol
patent: 4597017 (1986-06-01), Johnson et al.
patent: 4636639 (1987-01-01), Guillaume et al.
patent: 4645917 (1987-02-01), Penney et al.

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