End to end walking print

Details End to end walking print End to end walking print

1999-04-21

2001-09-04

Tu, Christine T. (Department: 2133)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Error/fault detection technique

C714S819000

Reexamination Certificate

active

06286124

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to the field of digital scanning devices and, more specifically, to error checking in digital scanning devices.
BACKGROUND
In electrophotographic reproduction devices, for example a printer, a host computer sends and receives control data to command various operations from the host computer to the printer. One type of control data relates to the positioning of page data to be generated on a print surface.
Typically, in printer systems, a printed image is formed using digital data that resides in the page memory of a processor. In one type of printer system, the image from the page memory is formed on a print surface using a scanning laser beam. An area of the print surface on which the image is formed is referred to as a picture element (PEL). One scan of the laser beam across the print surface forms a row of PELs, referred to as a scan row. The image from the page memory is formed with multiple scan rows.
The first PEL must be properly positioned in order for the scan rows to be horizontally and vertically aligned on the print surface. Defects in the data path between the host computer and the printer, however, may cause the scan rows to “walk” or be misaligned. This misalignment may go undetected if the user of the printer system does not inspect each printed page. In addition, testing individual components within the data path for defects adds to manufacturing cycle time and, thus, increases the cost of the printer systems.
SUMMARY OF THE INVENTION
The present invention provides a method of and apparatus for error checking. The method may include generating a known pattern in a predetermined segment of data having a plurality of segments and transmitting the data through a first data path having an end. The method may also include evaluating the data at the end of the first data path to determine if the data has the known pattern, and transmitting the data through a second data path based on the evaluating of the data at the end of the first data path.
Additional features and advantages of the present invention will be apparent from the accompanying drawings and from the detailed description that follows.


REFERENCES:
patent: 4558428 (1985-12-01), Matsumura et al.
patent: 4657372 (1987-04-01), Ikeda et al.
patent: 5313564 (1994-05-01), Kafri et al.
patent: 5822499 (1998-10-01), Okada et al.
patent: 5892590 (1999-04-01), Ida et al.
patent: 6122757 (2000-09-01), Kelley

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