Printing apparatus, method of inspecting nozzles for...

Details Printing apparatus, method of inspecting nozzles for... Printing apparatus, method of inspecting nozzles for...

2006-07-25

2010-06-01

Nguyen, Lam S (Department: 2853)

Incremental printing of symbolic information

Ink jet

Controller

C347S005000, C347S019000

Reexamination Certificate

active

07726760

ABSTRACT:
A printing apparatus records a predetermined test pattern on printing paper, and reads the test pattern by means of a scanner. The scanner reads the test pattern at a resolution lower than the resolution of a recording head. This allows the automatic and fast reading of the test pattern. Additionally, the printing apparatus performs an interpolation process on read data, and judges whether there is an abnormality in nozzles or not, based on the read data subjected to the interpolation process. This reproduces the positions of and spacing between lines recorded on the printing paper with high accuracy to achieve the exact judgment as to whether there is an abnormality in the nozzles or not. Therefore, an inspection with a high degree of reliability is accomplished.

REFERENCES:
patent: 2005/0030327 (2005-02-01), Tatsumi

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