JPS639561A - Electro thermal recorder - Google Patents

Abstract

PURPOSE:To ensure that scattering of the density and size of recorded dots and positional deviations of the dots can be eliminated, by energizing a plurality of recording electrode needles on a time-sharing basis with a small block as a unit, and controlling the energization so that one dot string recorded in correspondence with one row of the recording electrode needles are recorded by repeating the time-sharing driving a plurality of times. CONSTITUTION:For example, 24 recording electrode needles 1 of a recording head 8 are divided into three blocks, viz. a first block B1 consisting of the first to 8th recording electrode needles, a second block B2 consisting of the 9th to 16th recoding electrode needles, and a third block B3 consisting of the 17th to 24th recording electrode needles. To represents the recording period per one horizontal dot. One dot corresponding to each of the recording electrode needles 1 is recorded by 4 energizing pulses. The width of the energizing pulses is so set that the 4 energizing pulses gives one recorded dot with an appropriate density or in an appropriate size. Accordingly, the positional deviations between the recorded dots corresponding respectively to the blocks B1, B2, B3 can be reduced to 1/4 of those generated in a conventional method.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electrically conductive thermal coloring or electrically conductive recording device used in facsimiles, printers, and the like.

2. Description of the Related Art An example of a conventional energization recording device will be described below with reference to the drawings. FIG. 2 is a diagram explaining the recording principle of the current recording method. Further, FIG. 3 is a diagram in which the energization recording method shown in FIG. 2 is applied to a serial printer. In FIGS. 2 and 3, reference numeral 10 denotes a ribbon-shaped recording sheet, which is composed of a stretching layer 11, a conductive layer 12, and an ink layer 13.

Reference numeral 1 denotes a plurality of recording electrode needles, each of which is in contact with a driving transistor 2. 3 has a common return path ti crawler for a plurality of recording electrode needles 1 and is grounded. 5 is a control circuit for controlling ON/OFF of each transistor 2;
14 is a recording paper onto which the ink layer 13 is transferred, and a constant voltage is applied to the terminal 6. When the control circuit 5 is operated to turn on a predetermined transistor 2, the recording current flows from the recording electrode needle l with the transistor 2 turned on to the path shown by the broken line, that is, the resistance layer 11 directly below the recording electrode needle 1.
, the conductive layer 12, the resistance layer 11 directly below the return electrode roller 3, and the recording electrode needle 1 where current flows to the return electrode roller 3 and concentrates.
The resistance layer 11 directly below generates heat to melt the ink layer 13 and the ink layer 13 is transferred onto the recording paper 14. In FIG. 3, 8 is a recording head in which recording electrode needles 1 are arranged in a row;
A plantain 30 is placed between the recording paper 14 and the recording sheet 10.
It is an imposition. Recording sheet 10 and return electrode roller 3
The recording head 8 is mounted on a carriage 9 and is configured to be guided by a guide bar 31 and reciprocated along the print line as the carriage 9 moves.

As the carriage 9 moves, the recording sheets 10 are sequentially fed out, and at the same time, the control circuit 5 operates to selectively turn on and off the transistors 2 in sequence according to the character pattern, thereby marking predetermined characters or characters on the recording paper 14. It prints image patterns.

Figure 4 shows the 0
FIG. 4 is a diagram showing the timing of the energization operation when the recording electrode needle l is energized and driven using a time-division driving method. - As an example, the recording head 8 is composed of 24 recording electrode needles 1, and the timing of each recording electrode needle group is shown when the recording head 8 is divided into 3 parts of 8 each and time-divisionally driven. Electrode needle group B1. B2. B3 are configured to operate sequentially with staggered timings so that they are not energized at the same time. This is due to the fact that in the 1I1 recording method, which has a common return electrode for a large number of recording electrode needles 1, as the number of recording electrode needles that are energized at the same time increases, the current flowing through one recording electrode needle 1 decreases, resulting in a sufficient concentration. There is a problem that dots cannot be recorded, and to solve this problem, it is a very effective means to perform time-division driving and reduce the number of recording electrode needles l that are simultaneously energized.

FIG. 5 is a diagram showing the arrangement of recording dots 20 corresponding to one row of recording electrode needles l of the recording head 8 when recording is performed using the time-division driving method shown in FIG.

Problems to be Solved by the Invention However, in a current-carrying recording device using a conventional time-division drive system, the recording electrode needles l of the recording throat 8 are arranged in a straight line in a direction perpendicular to the direction of movement of the recording head 8. Since the gutter 8 records while moving, the recorded dots are not lined up in a straight line but are recorded at 1/3 pitch intervals. It turns out. As a result, there is a problem in that recorded characters and images are distorted.

Means for Solving the Problems In order to solve the above problems, the J-electronic recording device of the present invention energizes and drives a plurality of recording electrode needles in a time-division manner for each small block, and also drives the recording electrode needles in the - column in a time-division manner. It has a control circuit that controls the energization of the recording electrode needles so that one dot row recorded in correspondence is recorded by repeating time-division driving a plurality of times.

Operation In the present invention, each recording dot 20 is transferred and recorded not by one energization of the recording electrode needle, but by repeating a plurality of energization pulses, so that the positional deviation of the recording dot 20 can be made very small. In addition, each energization pulse is energized at different timings so that the small blocks of divided recording electrode needles are not energized at the same time, so the number of recording electrode needles that are energized at the same time can be reduced, and stable and uniform Recorded dots are obtained.

EXAMPLE Hereinafter, an energization recording apparatus according to an example of the present invention will be described with reference to the drawings. FIG. 1 shows an example of a method for controlling the energization of the recording electrode needle used in the energization recording apparatus of the present invention. In FIG. 1, B1 represents the first prosock from the 1st grain to the 8th grain by dividing the 24 recording electrode needle group of the recording head 8 into 3 parts, B2 represents the 9th grain to the 16th grain, and B3
is the second one from the 17th to the 24th. To, which represents the third block, is the recording period per horizontal dot.

As can be seen from the figure, one recording dot corresponding to each recording electrode needle 1 is recorded with four energizing pulses. The energizing pulse width is set in advance so that one recorded dot can have an appropriate density or an appropriate size in four pulses.

In addition, each block Bl, B2. The energization timings of B3 are sequentially shifted so that they do not overlap each other. In this way, 24 recording electrode needles 1 are time-divisionally driven, eight at a time, and recording in one vertical column is achieved by repeating the series of time-divisionally driving from 81 to 82 and from B2 to 83 four times. For each block B1. B2. The deviation of recording dots corresponding to B3 can be reduced to 1/4 of that of the conventional method shown in FIG.

In the embodiments, an energizing recording apparatus is shown that transfers an ink layer onto a recording sheet, but it goes without saying that the recording apparatus of the present invention can also be applied to an energizing coloring type recording system in which the recording sheet itself generates color. Also record sheet 10
Also, the structure is not limited to that shown in the embodiment.

As described in detail, the energization recording device of the present invention includes a control circuit that controls the energization of a plurality of recording electrode needles, and this control circuit drives the recording electrode needles in a time-division manner for each small block, and drives the recording electrode needles in a series of time blocks. Since the configuration is such that the energization to the recording electrode needles is controlled so that recording dots are printed in a vertical row by repeating the divided drive multiple times, the density of the recording dots can be increased by reducing the number of recording electrode needles that are energized at the same time. It is possible to eliminate variations in size and position of recording dots, and at the same time eliminate misalignment of recording dots.

[Brief explanation of the drawing]

FIG. 1 is a drive timing diagram of the recording electrode needle showing an example of the energization control method used in the energization recording device of the present invention, FIG. 2 is a diagram of the principle configuration of the energization recording device of the present invention, and FIG. A configuration diagram of an embodiment of an energized recording device, FIG. 4 is a drive timing diagram of the recording electrode needle when conventional time-division driving is used, and FIG. 5 is a diagram showing recording by the time-division driving method shown in FIG. FIG. To: Recording cycle per horizontal dot. Name of agent: Patent attorney Toshio Nakao (1 person) Figure 4

Claims (3)

[Claims] (1) A plurality of electrode needles that can be moved in contact with an energized recording material, a return electrode that comes into contact with the energized recording material, a driving means for moving the electrode needles relative to the energized recording material, and a drive means for moving the electrode needles relative to the energized recording material; energization control circuit means for selectively applying a recording voltage between each electrode and the return electrode, and the energization control circuit means is configured to time-divisionally drive the plurality of electrode needles for each small block; An energization recording device characterized in that a single dot row corresponding to the row of electrode needles is printed by repeating the time-division driving a plurality of times. (2) A print head having a plurality of electrode needles is provided on a carriage that moves along the print line of the energized recording material,
Claim (1) characterized in that the characters are sequentially recorded as the carriage moves.
The energization recording device described in Section 1. (3) The energization recording device according to claim (2), which is configured to print a single dot row by repeating time-division driving at least three times or more.