Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1997-03-21
1999-03-02
Le, N.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
347260, 347261, B41J 2235
Patent
active
058777989
ABSTRACT:
A laser printer is provided having an automatic printhead identification system for use in a family of laser printers that are compatible with more than one model of printhead. For example, a single laser printer model can be made so that two different printheads can be successfully used, so long as the printer system knows which laser printhead has actually been installed. To detect which printhead has been installed, the printer operating system provides a reference clock signal having a pre-determined frequency, which dictates the rotational speed of the motor. Once the motor has achieved a "lock" operational speed, the printer measures the scan rate of the faceted mirror by detecting the time interval between pulses of the "HSYNC" signal. The HSYNC signal is sent to a "divide-by-n counter" circuit which divides the pulse frequency of the HSYNC signal, thereby increasing the time interval (by a factor of "n") that must be sensed by the system to determine which printhead is in fact installed. So long as the HSYNC "lock" frequency is different between the various models of printheads that are compatible with a particular model laser printer, the principles of the invention can be used without adding any extra hardware sensors, signals, or memory addresses and detecting codes.
REFERENCES:
patent: 4135245 (1979-01-01), Kemplin et al.
patent: 4386862 (1983-06-01), Kittel et al.
patent: 4709245 (1987-11-01), Piatt
patent: 4716421 (1987-12-01), Ozawa et al.
patent: 4779104 (1988-10-01), Lawrence et al.
patent: 4868673 (1989-09-01), Negoro
patent: 4872027 (1989-10-01), Buskirk et al.
patent: 5049898 (1991-09-01), Arthur et al.
patent: 5049904 (1991-09-01), Nakamura et al.
patent: 5363134 (1994-11-01), Barbehenn et al.
patent: 5491540 (1996-02-01), Hirst
patent: 5504590 (1996-04-01), Kawada et al.
patent: 5541637 (1996-07-01), Ohashi et al.
patent: 5696685 (1997-12-01), Lee et al.
patent: 5710721 (1998-01-01), Rieckhoff et al.
Clarke Cyrus Bradford
Langer David Brian
Wright Phillip Byron
Aust Ronald K.
Le N.
Lexmark International Inc.
McArdle, Jr. John J.
Pham Hai C.
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