Inkjet recording head

Details Inkjet recording head Inkjet recording head

1998-03-31

2001-03-27

Le, N. (Department: 2861)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

C347S040000, C347S012000

Reexamination Certificate

active

06206503

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus employing an inkjet recording method, and more particularly to a recording apparatus for use in a printer for ejecting droplets from a nozzle to a recording medium.
2. Description of the Related Art
There has recently been a growing interest in non-impact printers, because noise while recording is extremely small to such a degree that it can be neglected. Particularly, inkjet printers are extremely effective in that they are structurally simple and that they can perform high-speed recording directly onto ordinary medium.
Inkjet printers fall into three broad categories: continuous type, on-demand (or impulse) type and electrostatic type. Among these types, the on-demand inkjet printer is provided with a lot of piezoelectric actuators which are selectively driven to eject ink droplets. Since a piezoelectric actuator ejects ink droplets on demand, it is possible to avoid needless ink consumption. Further, since the on-demand inkjet printer is structurally simple, it is expected to be widely used.
Recently, a color printer has been commercially available and the quality of color print is becoming increasingly higher. For a color inkjet head for use in such a color printer, it is very important to eliminate bleeding due to a combination of black and color nozzles.
In Japanese Patent Unexamined Publication No. 7-205454, an inkjet printer has been disclosed in which, to eliminate the bleeding when printing, an array of black nozzles is provided at a distance from other arrays of color nozzles. More specifically, the black nozzle array is placed such that it performs ink ejection in a scan line preceding that of the color nozzle arrays.
Since the black nozzle array and the color nozzle arrays are separately provided within a single head, however, it is difficult to miniaturize the inkjet head and further accurate positioning and high integration techniques are needed.
As another example of prior art, there has been disclosed an inkjet head in Japanese Patent Unexamined Publication No. 7-256874. This conventional inkjet head is provided with a plurality of arrays of nozzles wherein the upper half of a specific array is used for black ink and the respective lower halves of other arrays are used for different color inks; Yellow (Y), Magenta (M) and Cyan (Cy).
However, the lower half of the specific array and the respective upper halves of the other arrays are not used at all. Therefore, unused nozzles are easily clogged, resulting in deteriorated quality of printing.
SUMMARY OF THE INVENTION
It is an objective of the present invention to provide an inkjet recording apparatus which can achieve enhanced miniaturization and high reliability of printing.
According to the present invention, the apparatus includes first to third units which are integrated.
The first unit has a first monochrome section comprising a plurality of first monochrome nozzles and a first primary color section comprising a plurality of first primary color nozzles, wherein the first monochrome nozzles and the first primary color nozzles are arranged in a line.
The second unit has a second monochrome section comprising a plurality of second monochrome nozzles and a second primary color section comprising a plurality of second primary color nozzles, wherein the second monochrome nozzles and the second primary color nozzles are arranged in a line.
The third unit has a third monochrome section comprising a plurality of third monochrome nozzles and a third primary color section comprising a plurality of third primary color nozzles, wherein the third monochrome nozzles and the third primary color nozzles are arranged in a line.
The first to third units are integrated such that the first to third monochrome sections are placed side-by-side and the first to third primary color sections are placed side-by-side in a direction orthogonal to the line.


REFERENCES:
patent: 5654744 (1997-08-01), Nicoloff, Jr. et al.
patent: 5844585 (1998-12-01), Kurashima et al.
patent: 401216852 (1989-08-01), None
patent: 3189167 (1991-08-01), None
patent: 7-205454 (1995-08-01), None
patent: 7-256874 (1995-09-01), None

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