Circuit for modulating a scanning beam in a text and graphics im

Details Circuit for modulating a scanning beam in a text and graphics im Circuit for modulating a scanning beam in a text and graphics im

1986-09-22

1988-12-27

Goldberg, E. A.

Agitating

By vibration

350 67, G01D 942

Patent

active

047944056

ABSTRACT:
Image setting apparatus is disclosed for producing two-dimensional image on photosensitive material. The apparatus includes a device for transporting the photosensitive material past an imaging line to provide a first dimension of the two-dimensional image, a controllable source of electromagnetic radiation (EMR) for producing a modulated EMR beam, a scanning device for converting the EMR beam into a scanning beam, and a scan lens in the path of the scanning beam to focus the beam spot on the photosensitive surface. The beam spot thus moves repeatedly along the imaging line to provide the other dimension of the two-dimensional image. According to the invention, the EMR source is controlled to switch the EMR beam on and off at a frequency which is adjusted to compensate for variations in the scanning speed of the beam spot along the imaging line.

REFERENCES:
patent: 4306242 (1981-12-01), Jeffery
patent: 4482902 (1984-11-01), Bailey et al.
patent: 4719474 (1988-01-01), Hansen et al.

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