Method for placing information on a medium while compensating fo

Details Method for placing information on a medium while compensating fo Method for placing information on a medium while compensating fo

1988-07-13

1990-05-01

Reynolds, Bruce A.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346108, G01D 1514, G01D 900

Patent

active

049222660

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: 4037231 (1977-07-01), Broyles
patent: 4204233 (1980-05-01), Swager
patent: 4350988 (1982-09-01), Masegi
patent: 4613877 (1986-09-01), Spencer

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