Image forming apparatus and defective nozzle detection method

Incremental printing of symbolic information – Ink jet – Controller

Reexamination Certificate

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C347S014000, C347S005000

Reexamination Certificate

active

08066348

ABSTRACT:
An image forming apparatus includes a recording head, a water-repellent transfer belt, a pattern formation controller, a read unit, and a detection unit. The recording head has a plurality of nozzles aligned in a given direction, and ejects droplets of a liquid therefrom. The pattern formation controller directs each of the plurality of nozzles to eject the liquid to form a detection pattern on the transfer belt. The detection pattern has multiple droplets ejected from each of the plurality of nozzles sequentially arranged and spaced apart from each other both in the given direction and in a direction orthogonal to the given direction. The read unit includes a light emitting element and a light receiving element, and reads the detection pattern to output a read result. The detection unit detects a defective nozzle according to the read result.

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U.S. Appl. No. 08/253,426, filed Jun. 2, 1994 (Abandoned).
Sep. 13, 2011 Japanese official action in connection with a counterpart Japanese patent.

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