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US 5,510,819 AGranted
Ink jet printing head and electronic machine incorporating the same
AssigneeRohm Co., Ltd.
InventorsHisayoshi Fujimoto, Akihiro Shimokata
Life of this patent
Estimating the term…
Abstract
An ink jet printing head which is composed of a smaller number of parts than those in a conventional one, which leads to a reduction in the number of assembly steps, enhanced productivity and a reduction in the cost. A piezoelectric element is provided on a diaphragm at the portion corresponding to each pair of adjacent pressure chambers. A piezoelectric element includes an electrode which extends along each pressure chamber. An electronic machine incorporating this ink jet printing head is also provided.
Claims20
An ink jet printing head comprising:
- a substrate including a plurality of pressure chambers which are formed in an array on said substrate such that each of said chambers extends from one end of said substrate to another end thereof, portions of the substrate intermediate adjacent pressure chambers separating and defining said pressure chambers;
- a nozzle corresponding to each of said pressure chambers;
- a diaphragm disposed on a surface of said substrate to cover said plurality of pressure chambers and to cover the portions of the substrate intermediate adjacent pressure chambers;
- a plurality of piezoelectric elements, the plurality of piezoelectric elements being less than the plurality of pressure chambers, each of said piezoelectric elements provided over a portion of said diaphragm corresponding to a plurality of adjacent pressure chambers, and over portions of the substrate intermediate said adjacent pressure chambers, said diaphragm being intermediate said piezoelectric elements and said substrate;
- and
- means for actuating said piezoelectric elements to selectively actuate said adjacent pressure chambers so that each of said plurality of said adjacent pressure chambers corresponding to a piezoelectric element is actuable independently of actuation of adjacent pressure chambers that are activated by the same piezoelectric element.
3 more elements
An ink jet printing head comprising:
- a substrate including a plurality of nozzles and a plurality of pressure chambers arranged in a circle around said nozzles;
- a diaphragm disposed on a surface of said substrate to cover said plurality of pressure chambers;
- a first piezoelectric element provided over said diaphragm at a portion corresponding to a first plurality of adjacent pressure chambers, wherein the diaphragm is intermediate said substrate and said first piezoelectric element;
- a second piezoelectric element provided over said diaphragm at a portion corresponding to a second plurality of adjacent pressure chambers;
- and
- means for actuating said first piezoelectric element and said second piezoelectric element to selectively actuate said first plurality of adjacent pressure chambers and said second plurality of adjacent pressure chambers so that a first chamber in each of said pluralities of adjacent pressure chambers is actuable independently of actuation of a second chamber of said plurality of said adjacent pressure chambers.
3 more elements
An electronic machine comprising:
- an ink jet printing head having
- a substrate including a plurality of pressure chambers which are formed in an array on said substrate such that each of said chambers extends from one end of said substrate to another end thereof, portions of the substrate intermediate adjacent pressure chambers separating and defining said pressure chambers,
- a plurality of nozzles, one nozzle corresponding to each of said pressure chambers,
- a diaphragm disposed on a surface of said substrate to cover said plurality of pressure chambers and to cover the portions of the substrate intermediate adjacent pressure chambers, said plurality of pressure chambers arranged into groups of adjacent pressure chambers,
- a plurality of individual piezoelectric elements, the plurality of individual piezoelectric elements being less than said plurality of pressure chambers, disposed over said diaphragm for respective groups of adjacent pressure chambers and disposed over portions of the substrate intermediate adjacent pressure chambers in the respective group, said diaphragm being intermediate said piezoelectric elements and said substrate, and
- means for actuating said individual piezoelectric elements to selectively actuate said adjacent pressure chambers so that first pressure chambers of each group of said adjacent pressure chambers are actuable independently of actuation of second pressure chambers of each group of said adjacent pressure chambers;
- and
- a driver for driving the ink jet print head.
5 more elements
An electronic machine comprising:
- an ink jet printing head having
- a substrate including a plurality of nozzles and a plurality of pressure chambers arranged in a circle around said nozzles,
- a diaphragm disposed on a surface of said substrate to cover said plurality of pressure chambers, said plurality of pressure chambers arranged into pairs of adjacent pressure chambers,
- a plurality of piezoelectric elements provided on said diaphragm, each of the piezoelectric elements corresponding to a respective pair of adjacent pressure chambers, wherein the diaphragm is intermediate said substrate and each of said piezoelectric elements, and
- means for actuating each of said piezoelectric elements to selectively actuate said respective pair of adjacent pressure chambers so that a first pressure chamber of each pair of adjacent pressure chambers is actuable independently of actuation of a second pressure chamber of each pair of said adjacent pressure chambers.
2 more elements
Dependencies are inferred from the claim text.