Method and apparatus for scanning a web material in the directio

Details Method and apparatus for scanning a web material in the directio Method and apparatus for scanning a web material in the directio

1987-06-15

1988-12-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250236, H01J 314

Patent

active

047913045

ABSTRACT:
A method of scanning a web material and an apparatus for use in the method in which a web material is spatially divided into smaller divisions in a scanning direction while being scanned in the direction of a width thereof with a scanning beam moved by means of a polyhedral mirror with a constant speed of rotation. Clock pulses from a pulse generator are counted up by a counter to access division data in a storing means to provide division signals according to which the width of the web material is spatially divided in the scanning direction.

REFERENCES:
patent: 4173441 (1979-11-01), Wolf
patent: 4268172 (1981-05-01), Blitchington
patent: 4314154 (1982-02-01), Minoura et al.
patent: 4460273 (1984-07-01), Koizumi et al.
patent: 4468120 (1984-08-01), Tanimoto et al.
patent: 4507564 (1985-03-01), Shimada
patent: 4587531 (1986-05-01), Dangler

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