JPS58166074A - Thermal head - Google Patents

Abstract

PURPOSE:To make the speed fast and to make it possible to record a picture with a intermediate tone by providing serial-in parallel-out shift registers in two stages in a driving ICs for DD type thermal head, and providing a gate circuit group for resistor units. CONSTITUTION:Video signals 2<0>-2<2>, which are digitalized by an AD converter, are inputted to input terminals E0-E2. The first bit of the binary coded video signal is inputted to the shift register 1G1-1Gn, and the binary coded second bit is simultaneously inputted to the shift registers 2G1-2Gn. Then the terminal E1 is turned On, the terminal E2 is turned OFF, and a current is conducted under this state for a time period T1. Then E1 is turend ON and E2 is turned and the current is conducted for a time period T2. Then the current is conducted during the time period T1 for the video signal 2<0>, the current is conducted during the time period T2 for the 2<1>, and the current is also conducted during the time period (T1+T2) for the 2<2>. Thus the half tone picture can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a nine-terminal head in which five heating resistors and a semiconductor integrated circuit for driving them are formed on the same substrate.

[Technical background of the invention and its problems]

Thermal heads are required to have higher speeds, such as zero frame recording, and there is also a need for a device that can record images such as video signals at high speed, including not only characters but also halftones.

Conventionally, as a method of configuring such a thermal head, as shown in Fig. R11, for the thermal head burner and the heating resistor R1t1-&rVnk, multiple pardons are grouped together into one block, and each block is divided into two blocks. #p Conductor integrated circuit name: It is composed of nine chips C1-, Cn, and the nine chips C1, CnK, which are made into semiconductor integrated circuits, have heating resistors R'l
, t-BIn, m K corresponding nine drive-element at, Xun n,
The drive elements DI, 1''Dfl, and ffm are connected to the shift registers ()1- and On, respectively.

In the thermal head shown in Fig. 1, when performing a photocopy with a signal containing no. -ft/, such as a video signal, the video signal is A/D converted by the converter 118 shown in Fig. 2. 9 digital signals are used. For this example
I will explain.

No. 381(b) converts the video signal (1) for one line to the slice level, vI, ■2. In v3, the distribution is 9 digital signals 2°21, 2N. Using these digital notes 2°, 21° and 22, tη digital signal 2° data, which performs the following one-bell operation, is input to the shift register A1q1 in FIG. 1 and printed for 11 hours.

Next, input the data of K and 21 and print for T2 time.

Next, input data of 2'', print for T3 hours, repeat one sickle motion as in 1, and print 1 count.

In order to perform such a Kl line switching operation, three data transfers must be performed. For example, in an A4 size 8/W thermal head, the number of heating resistors is 17.
Also suitable for 28 dots.

Therefore, the bit data t corresponding to this dot a is 1.7 in IMHg.
It takes 28 rflll and if you repeat this 3 times, it will be 5.18
4ffllK will also be.

Make the 1 line operation 5ms or more, or clock I.
I have to raise the Mdg to 2MHz, 3 tremors.

It is not good to make one sickle movement for the first line more than 5ms, considering the shape of the mound, which is becoming faster and faster.
The shorter the Rhine Era 1aIIb work, the better. front,
Clock 1 ■The problem of raising z by 2M, 3Mt (gK) is a problem that affects the performance of the semiconductor integrated circuit itself.
Improving performance dramatically lowers manufacturing yields and increases costs. A thermal head incorporating a high-cost semiconductor integrated circuit and having a plurality of nine chips is quite expensive. Therefore, in conventional universal heads, the K for recording images including halftones, such as video signals, is not the same.

[Purpose of the invention]

The present invention has been made in view of the shortcomings of the conventional thermal head, and is suitable for high-speed processing, and is capable of processing III#II including halftones such as a video signal without reducing the speed. The purpose is to provide a thermal head that is capable of

[Summary of the invention]

In the present invention, a shift register with two or more stages of serial-in-parallel output and a gate circuit group for driving an ICK for a DD type thermal head are provided for each resistor, and halftones are realized in a circular manner.

[Embodiments of the invention]

FIG. 4 shows a specific configuration of a thermal head according to an embodiment of the present invention.

In the figure, heating resistors at, t~ of the thermal head are shown.
For the blocks n and mK, a plurality of chips are combined into one block, and each block is made into a semiconductor integrated circuit chip C1-
Cn is provided. FYP C made into a semiconductor integrated circuit
1-, CnK is the drive element Dt corresponding to the heating resistor Rs, ran, m, 1-J), 1. , B are connected, and the driving elements 01. l. , , nK are connected to the brass separator gate circuit Ml-Iso n, m. Also, the OR gate circuit A1.
1% A1, (H has AND gate circuit 1 al, l
~t En, me 2Bt, and r4Brvn are connected, respectively. Single-layer gout circuit I Bl, 1 to I E
The @10 inputs of 3n and m are common, and the output terminal F
The second inputs are connected to the parallel output terminals of the shift registers IG1 to IGn, respectively. Similarly, the first of AND gate circuit 2 BrJBm
The input is common and connected to the 9% output terminal F2,
! The inputs of s2 are each shift register 2 G1-20
It is connected to the parallel output terminal of n. In addition, shift registers IG, ~IGg, 2 (h ~ 2Gn) are connected in series, and are respectively connected to the output terminals of encoder E. To perform the kicking operation using this thermal head, follow the steps below. If the digitized video signal 2°-22 explained in FIGS. 2 and 3 is input to the input terminal Ha-g2 of the encoder E in FIG. is encoded twice and is the first bit of the nine video signals, shift register 2 (
h~2Go is encoded with 246 and is the second of nine video signals.
The 0th order terminal spot is open when bits are input at the same time, [2
It is sufficient to energize for T1 hours in the 01i'lF state, and then turn on El and E2 for T2 hours.

With K in this manner, a conversion of T1 time 1 2 Knt, T'211i14.2 K to t, and Te(T1+T2) time is performed for the video signal 2°.

In addition, in the above real example 1111, if the R number of the shift register is explained as 2 stages, and 9 increases this @ number, it is possible to obtain 2Nlllll 8-7 tones - me including white for NHK. It goes without saying that this is true.

〔Effect of the invention〕

As described above, the thermal head journal according to the present invention is simple and abridged, and it is easy to round up and speed up the process by transferring it only once. Before, without decreasing the clock station wave number,
With current manufacturing technology, it is possible to use inexpensive chips with low yields, and the thermal head can also be manufactured at low cost.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of a conventional thermal head, and Figure 2 is a diagram of a conventional thermal head.
Fig. 31 is a diagram showing the A/D converter used in the thermal head shown in Fig. 2; Fig. 31 is a waveform diagram generated by the D &amp; . Rt, t-4n, +n...heating resistor, D~p island 0m
...Drive element, A1-width...fi1 Logical sum gate circuit, 1B1-~on, m'', logical product gate circuit, 2B1
．． 1-2Bn1. n...! l/IJl product gate circuit. IGl~IGn, 2G1 (on...shift register E
...encoder. 181Figure 2Figure 8Figure 4

Claims (1)

[Scope of Claims] - Several heat-generating 1itIc elements arranged in a row, each of which drives the heat-generating resistors in a corresponding manner. The thermal head disposed on the same substrate includes drive elements that drive the heating resistors individually according to signal data, and a controller that supplies a signal to these drive elements in parallel. and a multi-stage shift register for outputting serially input signal data in parallel. For each stage of this shift register, the output of each '1)vh is used as the first input, and the control signal common to 4kR is inputted to the second input. The dirt circuit group of Raku 1 and these 11 as inputs
An ITI thermal head comprising a dirt circuit group of 2 whose input is the output of the dart circuit group corresponding to the same heat generating resistor and whose output is the drive element.