Fuji Photo Film Company, Limited

Katsuyoshi Tandou

Kunio Hakkaku

A control method of an ink jet printer having plural ink jet heads which are mounted on a carriage that reciprocates in a direction substantially orthogonal to a conveying direction of a recording sheet, and are deviated in the reciprocating direction of the carriage. The ejection time width for recording one dot by ejecting ink from each ink jet head is divided into plural pitches, each pitch is associated with an address of a timing data memory, and data indicative of ejection timing of each ink jet head is stored in the corresponding address of the memory. The data indicative of the ejection timing is read from the memory in address order to independently control the ejection timing of each ink jet head. Even when the mounting position of the ink jet head is deviated within the range of each dot, adequate recording can be performed without any dot deviation by adjusting the ejection timing.

Control method of ink jet printer

A control method of an ink jet printer having an ink jet head which ejects an ink droplet to record a dot on a recording sheet. When plural colors of ink are overlapped to record a dot, each color ink ejection time length is set shorter as compared with when a single-color dot is recorded. Ink amount in the dot in which the plural colors are overlapped is reduced, and ink blur on the recording sheet is prevented from occurring, so that recorded image quality can be enhanced. Preferably, ejection time width of one dot of ink ejected from the ink jet head is divided into plural pitches, each pitch is associated with an address of a timing data memory, and timing data is prepared by storing data indicating plural ejection time lengths of the ink jet head in the address corresponding to an ejection timing. Selection information for selecting any one of the ejection time lengths is included in record data for each dot, the ejection timing for each dot is determined from the timing data based on the ejection time length selected by the selection information of the record data, and each dot ink ejection time length is controlled.

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Tokyo, Japan

Katsuyoshi Tandou