Ink jet head
AssigneeFuji Xerox Co., Ltd.
InventorsHirofumi Nakamura, Torahiko Kanda
Life of this patent
Estimating the term…
Abstract
In an ink jet head, in order to make the occupying area of a chamber associated to each nozzle as small as possible, while maintaining a discharge ink drop volume, and on the other hand, to locate a number of nozzles with a high density, the plan view shape of a pressure plate provided to each chamber is so configured to fulfill the relation of 1:≦A≦2, where “A” is the ratio of an circumscribed circle diameter of the plan view shape of the pressure plate to an inscribed circle diameter of the plan view shape of the pressure plate. For example, the pressure plate is formed to have the plan view shape of a substantial square or a substantial rhombus. The chambers having such a feature are located in the form of a matrix. Thus, a stably driven, highly reliable ink jet head can be realized.
Claims20
An ink jet head comprising:
- a plurality of nozzles arranged to form a matrix having a plurality of rows inclined at a constant angle to a head main scan direction and a plurality of columns orthogonal to said head main scan direction;
- a plurality of chambers provided for said plurality of nozzles, respectively;
- a pressure plate formed to constitute one plane of each of said plurality of chambers;
- an actuator provided to each pressure plate, for deforming said pressure plate to compress an ink within a corresponding chamber;
- a plurality of ink pool branches provided along said plurality of rows or said plurality of columns, for supplying said ink to said plurality of chambers;
- and
- a main ink pool connected to said plurality of ink pool branches,
- wherein said pressure plate has a plan view shape fulfilling the relation of 1≦A≦2 where “A” is the ratio of a circumscribed circle diameter of the plan view shape of said pressure plate to an inscribed circle diameter of the plan view shape of said pressure plate.
Dependencies are inferred from the claim text.