JPS5816857A - Ink jet recording device - Google Patents

Abstract

PURPOSE:To make picture image clear even at high-speed printing, by a method wherein guard drop is decreased when printing mode is changed from final mode to draft mode. CONSTITUTION:A printing data generating circuit 1, a printing data converting circuit 2, distortion correcting circuits 3,4, a mode changing switch SW1 and a clock selecting switch SW2 are installed. In high-speed printing mode, the switch SW1 is connected to contact a and the switch SW2 is to contact c; in normal printing mode, the switch SW1 is connected to contact b and the switch SW2 is to contact d. In the high-speed printing mode and normal printing mode, quard drop is decreased without thinning the character matrix lines as in prior art, thereby clear printing is possible as shown in the figure.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a charge deflection type inkjet recording device that can perform a final mode for printing at normal speed and a draft mode for printing at high speed. The guard drop is reduced when switching the mode from the final mode to the draft mode, thereby preventing a drop in printing quality when printing in the draft mode.

A charge deflection type inkjet recording device that operates in a final mode for printing at normal speed and a draft mode for printing at high speed has already been proposed. Since the printing speed is increased by thinning out the matrix rows, there is a drawback that the image becomes thin and unclear.

The present invention was made in order to eliminate the above-mentioned drawbacks of the prior art, and in particular reduces guard drop in draft mode, thereby making clear high-speed printing possible.

1 and 2 are electrical block diagrams for explaining an embodiment of an inkjet recording apparatus according to the present invention, in which 1 is a print data generation circuit, and 2 is a print data conversion circuit. , 3 and 4 are distortion correction circuits, SWl is a mode switching switch, and SW2 is a clock selection switch. In high-speed printing mode (draft mode), SWl is connected to contact Aa side and SW2 is connected to contact c In the normal printing mode (final mode), SW1 is connected to the contact 4b side, and SW2 is connected to the contact d side. Conventionally, in an inkjet recording device that operates in a high-speed printing mode and a normal printing mode as described above, character matrix rows are thinned out in the high-speed printing mode. In this case, the printing as shown in Fig. 3 was performed, which had the disadvantage that the image was thin and unclear.However, in the present invention, the rows of the character matrix are thinned out to greatly reduce the guard drop. , for example,
As shown in FIG. 4, clear printing is possible.

In this case, in the embodiment shown in FIG. 1, in the normal printing mode, so-called sequential printing is performed in which the columns of the character matrix are printed in order from the end 75, and in the high-speed printing mode, Non-sequential printing is being performed. Of course, each circuit such as the distortion correction circuit and the operating speed of the carriage change depending on the printing mode, so the frequency of the clock (here, the clock is a clock with the same period as the effective frequency of printing) can be changed. For example, the clock frequency when the guard drop is O is twice as high as when there is only one guard drop. In other words, the distortion correction circuit, carriage movement, etc.
Since it operates at the same period as the effective frequency, the clock must be changed depending on the change in guard drop, and switch SW2 is the only one that can do this. In addition, the present invention has a distortion correction circuit for each mode to correct aerodynamic or electrostatic printing distortion. Therefore, in high-speed printing mode, which prints with a different number of guard drops from the number of guard drops in normal printing mode, a printing distortion correction circuit suitable for high-speed printing mode, which is different from that in normal printing mode, is required. It is a waste that must be used. That is, in the normal printing mode, the switch SW1 is connected to the contact side, and the distortion correction circuit 4 corrects the printing data. At that time, a guard drop is inserted as a predetermined number of data, and the high-speed printing In the photo mode, the switch SW1 is connected to the contact or d side, and (in the embodiment shown in FIG. 1, the print data is converted into non-sequential print data by the print data conversion circuit 2, and then) the distortion correction circuit 3, the printing data is corrected, and at this time, the guard drop is set to be slightly smaller than in the normal printing mode.

As is clear from the above description, according to the present invention, an image in high-speed printing mode can be made clear with a simple configuration.

[Brief explanation of drawings]

1 and 2 are electrical block diagrams for explaining embodiments of the inkjet recording apparatus according to the present invention, FIG. 3 is an example of characters printed by a conventional inkjet recording apparatus, and FIG. An example of characters printed by the inkjet recording apparatus of the present invention is shown below. 1...Print data generation circuit, 2...Print data conversion circuit, 3 and 4...Print distortion correction circuit. Patent applicant Ricoh Co., Ltd.

Claims (3)

[Claims] (1) 1 In a charged deflection type Infusiera+ recording device that has a final mode that prints at normal speed and a draft mode that prints at high speed, guard drop must be applied when switching the printing mode from final mode to draft mode. An inkjet recording device characterized by reducing the amount of water. (2) Switch from the final mode to the draft mode υ
The inkjet recording apparatus according to claim 1, wherein guard drop is reduced and printing is performed non-sequentially when changing the inkjet recording apparatus. (3) The inkjet recording apparatus according to claim 0 or (2), characterized in that it has separate printing distortion correction circuits for each of the final mode and draft mode.