Method and apparatus for placing information on a medium while c

Details Method and apparatus for placing information on a medium while c Method and apparatus for placing information on a medium while c

1986-07-29

1988-11-22

Goldberg, E. A.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

358296, G01A 942

Patent

active

047869194

ABSTRACT:
A laser scanning apparatus is provided with a compensating arrangement whereby deviations of a synchronous drive are compensated for by adjusting the frequency with which the laser beam is modulated. The laser beam is directed onto a rotatable spinner which causes the laser beam to scan a synchronized moving medium in a number of sequential and parallel lines, each of which is determined during a cycle of the movement of the spinner. The spinner is driven by a synchronous motor. During each cycle, a period error is measured to determine a compensating signal which is held for the next successive cycle and is used to control the frequency of a variable oscillator which determines the clocking rate at which information is employed to modulate the laser beam. According to the method of the invention, lines of information are placed on a synchronized moving medium responsive to the aforesaid laser beam during successive cycles. The method involves modulating the laser beam in accordance with the information and at a frequency which is modified for each cycle in accordance with the deviation of the preceding cycle with respect to a characteristic normal time period.

REFERENCES:
patent: 3848087 (1974-11-01), Carrell
patent: 4204233 (1980-05-01), Swager
patent: 4350988 (1982-09-01), Masegi

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