Print head with light-emitting element driving correction

Details Print head with light-emitting element driving correction Print head with light-emitting element driving correction

1993-08-02

1997-04-22

Fuller, Benjamin R.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347240, B41J 2435, B41J 245, B41J 247

Patent

active

056233000

ABSTRACT:
A print head for reproducing a multi-level image is an provided. In the print head, a light-emitting array comprises a linear line of light-emitting elements. A D/A converter converts a multi-level image data to an analog signal, and an analog shift register shifts and latches the analog signals of a line received from the D/A converter. An analog latch register latches the analog signals held by the analog shift register. A driver controls the quantity of light of the light-emitting elements according to the analog signals latched by the analog latch register. In one embodiment, the print head includes a second analog shift register, an A/D converter a line memory and a divider which divides the image data by a signal from the line memory to produce corrected data which is provided to the driver to control driving of the light-emitting elements. In another embodiment, the print head includes an amplifier and a gain correction circuit having a sample and hold circuit from which the driver receives signals to control driving of the light-emitting elements.

REFERENCES:
patent: 4074319 (1978-02-01), Goldschmidt et al.
patent: 4368491 (1983-01-01), Saito
patent: 4575765 (1986-03-01), Hirt
patent: 4712116 (1987-12-01), Reinten
patent: 4952949 (1990-08-01), Uebbing
patent: 5241324 (1993-08-01), Tamura et al.
Cannon, Don. L and Luecke, Gerald, Understanding Communications Systems, Texas Instruments, 1980. p. 3-2.

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