| 摘要 |
A system for detecting pen-to-paper spacing (PPS) in a printing system having a pen attached to a moveable print head positioned near a print media position, includes a test pattern, at the print media position, a sensor device, attached to the print head, and a controller. The test pattern includes printed lines having a line dimension, and the sensor device is positioned to shine light upon, and detect light reflected from the test pattern as the print head scans across the test pattern. The controller is connected to receive reflectance signals from the reflectance sensor, and configured to determine line dimensions in the test pattern and compare said line dimensions with predetermined line dimension values for the test pattern to determine variation in the PPS.
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