JPS6110461A - Ink jet printer - Google Patents

Abstract

PURPOSE:To eliminate the deterioration of sharpness and to raise the speed of printing, by a method wherein ink is jetted by inclining it in the printing paper feeding direction from the direction perpendicular to the printing paper and the ink dot is made of the elliptical shape having the line of apsides in the printing paper feeding direction. CONSTITUTION:An ink jet nozzle 10 is mounted by inclining it in the printing paper feeding derection from the direction perpendicular to the printing paper 11. Ink is obliquely jetted by inclining it in the printing paper feeding direction from the direction perpendicular to the printing paper 11. Thereby, an ink dot 12 can be made of the elliptical shape having the line of apsides in the (y) direction, the printing paper feeding direction. Because the ink dot 12 can be thus made of elliptical shape, the printing time can be shortened to one half without deteriorating the sharpness to one half by comparing it with that of conventional dot and the speeding up thereof can be achieved.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to an inkjet printer.

[Conventional technology]

2. Description of the Related Art Conventionally, an inkjet printer is one of hard copy devices for printing color images from a color television or a personal computer onto paper or the like.

An inkjet printer uses an inkjet nozzle to form ink dots, so that images on a cathode ray tube can be printed out using the ink dots. The inkjet nozzle uses stable ink III tA using a piezo element and can produce four levels of density. Furthermore, in order to improve the 8JIrt gradation, one pixel is formed into a 2 x 2 matrix, and the size of the ink dot 1 formed in each matrix is changed in four stages, resulting in a 4 x 4- 1
You can issue the 6th order. As a result, a 16-gradation color printer has excellent resolution and can print out on a clear screen.

[Problem to be solved]

However, in such conventional inkjet printers, as shown in No. 30, Infusiella 1 to
Since the nozzle 10 is installed so as to be oriented perpendicularly to the paper 11, the ink jet is ejected to the paper 3 in the same direction, and as shown in FIG. 3(B) or FIG. ~2 has a circular shape. Since 1 liter is large, it is essential to form a large number of circular ink dots 2, and as a result, there is a drawback that it takes a long time to print out.

[Means for solving problems]

The means of the present invention for solving the above-mentioned problems is that the ink jetting direction of the inkjet nozzle is inclined from the direction perpendicular to the paper to the paper feeding direction, and the ink dots are formed into an elliptical shape having a long axis in the paper feeding direction. This is a summary.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on FIGS. 1 and 2.

In Fig. 1, reference number J410 is an inkjet nozzle for Infusiera 1 to printers, which stabilizes ink ejection using a piezo element similar to the conventional one, and has four density levels by changing the pulse width of the driving pulse applied to the piezo element. It is now possible to create a tone. The inkjet nozzle 10 is installed obliquely in the paper feeding direction rather than perpendicular to the paper 11, so that ink is ejected obliquely from the perpendicular direction to the paper 11 in the paper feeding direction. Thereby, as shown in FIG. 1(B), the ink dot 12 can be formed into an elliptical shape having its long axis in the Y direction, which is the paper feeding direction.

Next, the effect will be explained.

When printing out images on a cathode ray tube using the Infusiera L-nozzle 10 having the above configuration, the fourth
The conventional 16-tone density +i tone shown in the figure is -image 2X
2 matrix, and by combining this with four levels of density gradation, it was necessary to eject dots twice in the Y direction, 0'J/A.

On the other hand, in this invention, as shown in FIGS. 1(B) and 2, the ink dot 12 can be formed into an ellipse shape having a long axis in one direction, so that the sharpness can be improved by 1. /2 print time without deterioration. /
This can be shortened to 2 to speed up the process.

That is, regarding the printing time, as shown in FIG. Since is elliptical, one dot injection in one direction is sufficient.

Therefore, the number of dots is reduced to 1/2, and the time required for printing is also reduced to 1/2. /2, making it possible to realize a ^-speed printer.

Regarding sharpness, when comparing the fourth case with the case shown in Fig. 2, the dot area is slightly smaller in the Y direction, but the dot density in the χ direction is the same, so the image quality is approximately the same. A clear image of - can be obtained.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be modified in various ways.

〔effect〕

As is clear from the above description, according to the present invention, the ink jetting direction of the inkjet nozzle is tilted toward the paper feeding direction from the direction perpendicular to the paper, and the ink dots are formed into an elliptical shape having a long axis in the paper feeding direction. Therefore, compared to the conventional method, the print time can be reduced to 1/2 and the print 1-out speed can be increased without deteriorating the sharpness.

[Brief explanation of drawings]

FIG. 1 (A> is a sectional view showing an inkjet printer according to an embodiment of the present invention, FIG. 1B is a plan view showing the shape of ink dots, and FIG. 2 is a diagram showing density gradation by an inkjet printer. , FIG. 3(A) is a sectional view showing a conventional Infusiera 1-printer, FIG. 3(8) is a plan view showing an ink dot shape, and FIG. 4 is a chart showing density gradation by an inkjet printer.10 ...Infusiera 1~nozzle, 11...
...Paper, 12...Ink drive 1~. Applicant NEC Home Electronics Co., Ltd. Agent Patent Attorney Masu 1) Takeo -〇- (A) (B) Figure 4 (A) (B) Figure 3

Claims (1)

[Claims] 1. In an inkjet printer that uses an inkjet nozzle to form ink dots and prints out images on a cathode ray tube using the ink dots, the ink jetting direction of the inkjet nozzle is changed from the direction perpendicular to the paper to the paper feeding direction. What is claimed is: 1. An inkjet printer characterized in that the ink is ejected at an angle so that the ink dots have an elliptical shape with a long axis in the paper feeding direction.