JPH03244559A - Recording head drive method and recorder using the recording head - Google Patents

Abstract

PURPOSE:To eliminate a difference in recording density among blocks to record one line with a uniform density by a method wherein an energy amount to be applied to each of the electrothermal conversion body blocks of a recording head is regulated in accordance with a resistance of a power supply line corresponding to each of the blocks. CONSTITUTION:Strobe signals STB1, STB2, STB3, and STB4 are respectively connected to a first block 23a, a second block 23b, a third block 23c, and a fourth block 23d. Only when these signals have a high level, an electric current is pased through heating resistors of the connected block, and the heating resistors are selectively heated according to recording data to conduct recording. The pulse width of each strobe signal is determined to be t1 for the first and fourth blocks 23a, 23d having a large resistance of a power line and t2 for the second and third blocks 23b, 23c having a small resistance of a power line. A relation of t1>t2 is held. By determining the values t1, t2 so as not to generate a difference in recording density among the blocks, whole of one line can be recorded with a uniform density.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a method for driving a recording head for recording on a recording medium by applying electricity to an electrothermal transducer of the recording head to generate heat, and a method for using the recording head. This relates to recording devices that were previously used.

[Prior Art] In recent years, thermal heads have been widely used as recording heads in facsimile machines and the like. In such a recording apparatus, for example, as shown in FIG. 7, a thermal recording sheet 51 wound into a roll is conveyed to a position where it is sandwiched between a platen roller 50 and a thermal head 52, and the thermal recording sheet is An image is formed by selectively heating the sheet 51 with a thermal head 52. This thermal head 52 has a plurality of heat generating resistors arranged in a straight line, and in a B4 size thermal head generally used in facsimile machines, the heat generating resistors are arranged at a ratio of 8 pieces per 1 mm. 84 width (256mm) overall 20
Forty-eight heating resistors are provided.

Here, when electricity is applied to each heat generating resistor of the thermal head 52, the temperature of the heat generating resistor increases and instantaneously reaches a temperature that causes the heat sensitive recording sheet 51 to develop color, thereby performing heat sensitive recording.

FIG. 8 is a block diagram showing the circuit configuration of such a line type thermal head 52.

53 is a heating resistor arranged in a line, and 54 is a driver IC that controls energization to each heating resistor. This driver IC includes a driver circuit 54a, a latch register 54b that latches one line of recording data, and a shift register 54c that shifts in and stores one line of recording data 55 that is serially transferred from a control section, etc. etc. are included. As a result, one line of recording data stored in the shift register 54c is transferred to the latch signal 60.
is latched into the latch register 54b. and,
When a strobe signal (STB) is output from a control unit or the like, the corresponding heating resistor is energized to generate heat according to the recorded data stored in the latch register 54b.

FIG. 9 is a diagram showing a specific example of the circuit of the thermal head 52. In this thermal head 52, as described above, 2048 heating resistors 53 are provided in a line. Here, since each driver IC 54 is configured to be able to drive 64 heat generating resistors, 2
A total of 32 driver ICs 54 are arranged to drive 048 heating resistors. A common electrode line 57 supplies a power supply voltage of 24V to all the heat generating resistors. Reference numeral 58 denotes a ground line having the same potential as OV, which is wired from the center in the longitudinal direction of the thermal head 52 toward both ends with a line having approximately the same width.

As is clear from the figure, the common electrode line 57 can be wired through a space with sufficient margin in the pattern configuration, so by providing a line width sufficient to allow a large amount of current to flow at once, the voltage can be maintained at both ends of the thermal head. It is designed to reduce the amount of descent. On the other hand, there are restrictions on the area near the area where the ground line 58 is wired because data input lines, latch signal lines, strobe signal line patterns, etc. are wired, and in order to make the shape of the thermal head as small as possible. The common electrode line 57 is wired with a thinner line than the common electrode line 57.

When the thermal head 52 is energized, a large amount of current flows at once if all 2048 heating resistors 53 are energized at the same time. Therefore, the power supply for driving the thermal head needs to have a large capacity, which increases the cost of the apparatus. Therefore, 512 heating resistors, 512 heating resistors,
That is, one block is made up of eight driver ICs, and all the heat generating resistors of the thermal head 52 are divided into four blocks and driven to generate heat.

Here, the first block 59a, the second block 59b, and the third block 59c of all the heating resistors of the thermal head 52
and a fourth block 59d, and the strobe signal lines of the eight driver ICs of each block are collectively defined as the strobe signal of each block. These are the four strobe lines shown below, namely strobe 1 (5
6a) Strobe 2 (56b) Strobe 3 (
56c), strobe 4 (56d).

Here, for example, when 5V is applied to strobe 1 (56a), the heating resistor corresponding to the first block is energized and driven to generate heat in accordance with the recorded data. The time t1 for applying current to the heating resistor, that is, the time t1 for applying 5V to the strobe wire, is determined experimentally by observing the coloring state of thermal paper, etc., and is approximately 2 to 2.5 ms here. .

FIG. 10 shows one example using such a thermal head 52.
FIG. 6 is a diagram showing the timing of serial input data, latch signals, and strobe signals when recording a line.

First, serial data of 2048 dots per line is transferred to the thermal head 52 and sequentially stored in the shift register of each driver area C. Then, by outputting the latch signal (LA), the recording data recorded by the driver IC is latched in the latch circuit of each driver IC. Next, when a time width strobe signal (STBI) is applied to block 59a (strobe 1), recording is performed in the first block 59a. By sequentially applying a strobe signal with the same time width (1) as the strobe signal of the first block to the second, third, and fourth blocks, one line of recording data can be recorded. .

[Problems to be Solved by the Invention] However, in the above conventional example, in order to make the thermal head as small as possible and to simplify the structure, the ground (power line)
The width of the line pattern cannot be made wide enough. For this reason, the ground (power line) line becomes thinner and the wiring resistance cannot be ignored.

In particular, as is clear from FIG. 9, the length of the ground (power line) line pattern varies depending on the divided block of the thermal head 52.
The blocks 59a and 59d at the ends and the blocks 59b and 59c near the center have different lengths of ground (power line) lines, resulting in a difference in wiring resistance. Therefore, even if a strobe signal of the same width is applied to each block, there will be a difference in the current value flowing through the heating element of each block, resulting in a problem that a difference will occur in the recording density of the image recorded between each block. Ta.

That is, the ground (power line) line of the first block 59a is
Since it is more than twice as long as the ground (power line) line of the second block 59b, the ground (power line) of the first block 59a
The resistance value of the line is approximately twice or more than the resistance value of the ground line of the second block 59b. Therefore, the first block 59a
Even if the first block 59a and the second block 59b are energized and recorded under the same conditions, the density recorded by the first block 59a will be lower than the density recorded by the second block 59b. Similarly, the recording density in the fourth block 59d is lower than that in the third block 59c.

The present invention has been made in view of the above conventional example, and eliminates the difference in recording density between each block by adjusting the amount of energy applied to each block of the recording head according to the resistance of the power line corresponding to the block. It is an object of the present invention to provide a method for driving a print head that enables printing one line with uniform density, and a printing apparatus using the print head.

[Means for Solving the Problems] In order to achieve the above object, a recording head driving method of the present invention has the following configuration. That is, a method for driving a recording head in which a plurality of electrothermal transducers are arranged in a line, and an image is recorded 7 on a recording medium by energizing the electrothermal transducers, the method comprising: It is divided into a plurality of blocks, and the amount of energy applied to each block is adjusted according to the resistance value of the power supply line to each of the blocks.

Further, a recording apparatus using the recording head of the present invention has the following configuration. That is, a recording apparatus is provided with a recording head which arranges a plurality of electrothermal transducers in a line and records an image on a recording medium by energizing the electrothermal transducers, the plurality of electrothermal transducers of the recording head A drive means that divides the heat converter into a plurality of blocks and drives them to generate heat, and an adjustment that adjusts the amount of energy applied to each block according to the resistance value of a power supply line to each of the blocks in the recording head. and a control means for transferring print data to the recording head, applying applied energy adjusted by the adjusting means to each of the blocks, and controlling the driving means to perform recording.

[Function] In the above configuration, a plurality of electrothermal transducers are arranged in a line, and a plurality of heat generating resistors of a recording head that records an image on a recording medium by energizing the electrothermal transducers is arranged in a plurality of blocks. The amount of energy applied to each block is adjusted according to the resistance value of the power supply line to each block.

Further, the printing apparatus adjusts the amount of energy applied to each block according to the resistance value of the power supply line to each block in the print head. Then, the print data is transferred to the print head, and the adjusted applied energy is applied to each block to generate heat, thereby performing printing.

[Embodiments] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[Description of the thermal printer (Figures 1 and 2)] Figure 1 shows the control unit 101 and recording unit 1 of the thermal printer of the embodiment.
2 is a block diagram showing the configuration and electrical connection with the recording unit 102. FIG.

The configuration of the recording section 102 shown in FIG. 2 is exactly the same as that of the conventional example shown in FIG. An image is formed on the thermosensitive recording sheet 11 by selectively heating 20 electrothermal transducers (heating resistors) according to the recorded data. The platen roller 10 is connected to a recording paper conveyance motor 2.
8 (Fig. 1).

In FIG. 1, reference numeral 101 denotes a control unit that controls the entire printer device, such as a CPU such as a microprocessor.
11, CPU 11 A ROM 112 that stores control programs and various data for the CPU 11, a RAM 113 used as a work area for the CPU 111, and the like are provided. 1
A timer 14 is used to time the width of a strobe signal to each block, which will be described later.

Next, the configuration of the recording unit 102 will be explained. A thermal head 20 has a circuit configuration similar to that shown in FIGS. 8 and 9, and is equipped with 2048 heating resistors. 1st
In the figure, 21 is a shift register, 22 is a latch circuit, and these are shown as a combination of the shift register 54c and latch register 54b of each driver IC. 23
is a plurality of heat generating resistors arranged in a line, and is divided into four blocks (23a-23d) as described above with reference to FIG. 24 is a common electrode for supplying power, and corresponds to 57 in FIG. Also, 9 is the grand line,
These power lines are connected to the power supply unit 26 and
Power is supplied to the thermal head 20 from the above.

Reference numeral 25 denotes a temperature sensor such as a thermistor provided in the thermal head 20. The control unit 101 inputs temperature information from this sensor 25 and changes the applied energy to the heating resistor 23 according to the temperature of the thermal head 20. recording control. 28 is a recording paper transport motor that rotationally drives the platen roller 10 to transport the thermal recording sheet 11; 27 is a drive circuit ' that rotationally drives the recording paper transport motor 28; and 29 is a drive circuit that drives the cutter 30. This is a drive circuit. 31 is a recording paper sensor, which is a thermal recording sheet 11;
The presence or absence of is detected.

[Description of Thermal Head (Fig. 3)] Fig. 3 is a block diagram showing the configuration of the thermal head 20 of the embodiment.As mentioned above, it has 2048 heating resistors, and as shown in the figure, each It can be divided into four blocks each consisting of 512 heating resistors and driven. In addition, the common electrode line 24 (24V) and ground line 9 (OV) that supply power to each block are inputted from the center and wired in both directions as shown in FIG. Since there is a margin for the line 24 in the pattern configuration, the pattern is configured to be thick so as to minimize the wiring resistance connected to each block. On the other hand, the ground line 9 should have a thick pattern like the common electrode line 24, but since there are many other signal lines near the ground line 9, it is necessary to make the thermal head itself more compact. , the minimum thickness that can withstand the current. Therefore, the resistance of the ground line 9 increases, and a difference in wiring resistance occurs between blocks.

Here, the resistance of the ground line 9 is indicated by R3-R4. As mentioned above, since the thermal head 20 is symmetrical, the ground line 9 at the center of the thermal head 20
The distance to the ground terminal of each block is also symmetrical, and there is a relationship of R,=R4,Rz''Rs.In other words,
The resistances of the power lines of the first block 23a and the fourth block 23d are Rl + Ra (: Rs + R4), and the resistances of the power lines of the blocks 23a and 23d are equal, and the resistances of the power lines of the second block 23b and the third block 23c are equal. The resistance of these second blocks 2 is R, (=R1).
It is considered that the resistances of the power lines 3b and 3rd block are approximately equal.

[Thermal head control (Figs. 4 and 5)] Next, the fourth
The heat generation drive control of the thermal head 20 will be explained based on the timing chart shown in the figure and the control flowchart shown in FIG.

DATA is the shift register 21 of the thermal head 20
Serial data (recorded data) transferred to the controller 101 in synchronization with the shift clock (SCLK). LA is a latch signal, and one line of recording data stored in the shift register 21 is latched into the latch circuit 22 by this signal. 5TBI-STB
4 is a strobe signal output corresponding to each block, STB 1 is sent to the first block 23a, 5TB2 is sent to the second block 23b, and 5TB3 is sent to the third block 23c.
, and 5TB4 are connected to the fourth block 23d.

And only while these strobe signals are at high level,
The heating resistor of the connected block is energized,
Recording is performed by selectively heating the recording data in accordance with the recorded data. Here, the pulse width t of each strobe signal is tl for the first block 23a and the fourth block 23d whose power line resistance is large, and the pulse width t of the second block 23a whose power line resistance is small.
For block 23b and third block 23c, t2
It is said that Here, there is a relationship t r > t 2, and if these t+ and tz are determined by experiment etc. so that there is no difference in recording density between each block, the entire line can be recorded with a uniform density. can do.

Next, the recording process in the thermal printer of this embodiment will be explained according to the flowchart in FIG. Note that this recording processing program is stored in the ROM 112, and is started when at least one line of recording data (image data) is input from an external device or the like and recording becomes possible.

In step S1, one line of recording data is serially transferred to the shift register 21 of the thermal head 20, and in step S2, a latch signal (LA) is output to the latch circuit 20.
2, one line of recording data is latched. Next, in step S3, the rotation of the recording paper conveyance motor 28 is started, and the conveyance of one line of the thermosensitive recording sheet 11 is started.

In step S4, the first block 23a of 23 heating resistors is
energize. In step S5, the timer 114 measures the energization time t1 to the first block 23a, and the time 1. After lapse of time, the process proceeds to step S6, and in steps S6 and S7, the second block is molded for a time t2. When the energization to the second block 23b is completed, the process proceeds to step s8, and energization to the third block 23c of the heating resistor 23 is started, and in step S9, the molding is carried out for a time t2. Furthermore, in step S10 and step Sll, the fourth block 23d of the heating resistor is molded for a time t1. Here, the relationship between these times t1 and t2 is t + > t 2. In this embodiment, the timer 114 measures these energization times, but it goes without saying that a software timer may also be used.

When the energization to the four blocks is completed in this way and the recording process for one line is completed, the process advances to step S12, and it is checked whether the image recording for one page has been completed.

If image recording for one page has not been completed, step S16
The recording data of the next line is transferred to the thermal head 20.
When the transfer is completed, the process proceeds to step S2, where it is latched into the latch circuit 22 by the latch signal LA, and the process proceeds to step S3 and subsequent recording processes.

Note that this transfer of the next line data to the thermal head 20 may be performed during the waiting time of steps S5, S7, S9, and S11.

When the recording process for one page is completed in step S12, the process proceeds to step S13, where the platen roller 1O is further rotated to transport the recording sheet 11 by a predetermined distance, and the cutter 30 cuts the recorded portion of the recording sheet. Then, the recorded recording sheet 11 is ejected from the apparatus, and the remaining recording sheet 11 is rewound by a predetermined amount to locate the beginning of the recorded portion.

As explained above, according to this embodiment, the energy applied to the heating resistor block portion of the power line of the thermal head having a high resistance value is made larger than the energy applied to the heating resistor block having a lower resistance value. , it is possible to perform printing by eliminating the difference in printing density for each block when printing one line.

<Second Embodiment (FIG. 6)> In the first embodiment described above, a case was explained in which four blocks were driven one block at a time, but here a case will be explained in which two blocks at a time are driven at a time. Note that the configuration of the printer is the same as in the first embodiment.

According to the first embodiment described above, the pulse widths of the strobe signals applied to the first block 23a and the fourth block 23d are both 1+, and the pulse widths of the strobe signals applied to the second block 23b and third block 23c are both t2. It is. Therefore, as shown in FIG. 6, the first block 23a and the fourth block 23d are applied simultaneously for a time t1, and then the second block 23b and the third block 23c are simultaneously applied for a time t2.
By applying time, one line can be recorded in approximately half the time of the first embodiment, and the recording density of one line can also be made uniform.

Note that the number of electrothermal transducers of the thermal head, the number of blocks divided by the driver IC, the applied voltage, etc. in the above-mentioned embodiment are not limited to this embodiment. Further, in the above embodiment, only the resistance of the ground line among the power lines was focused, but the same applies to the common electrode line.

Further, in the above-described embodiments, it has been described that power is supplied from the center of the thermal head, but the present invention is not limited thereto, and for example, the power line may be supplied from the end of the thermal head. In that case, the pulse width or voltage applied to each block may be individually set in consideration of the distance between the power supply terminal portion and each block.

As explained above, according to this embodiment, by changing the energization time of each block according to the distance of the power supply line, the voltage value applied to each block can be changed depending on the difference in resistance of the power line supplied to each block. Even if the density is non-uniform, it is possible to record with uniform density.

Further, by using this method, the wiring pattern of the power line can be made thinner than before, so that the thermal head can be made smaller and lower in cost.

Further, it is easy to deal with density unevenness that is not directly caused by the thermal head itself due to the device configuration or the like later.

Note that in this embodiment, the variation in recording density between blocks was eliminated by changing the current application time, but the present invention is not limited to this, and for example, the voltage applied to each block was changed. It may be changed.

In addition, although this embodiment has been described in the case of a thermal printer that records on a thermal sheet using a thermal head, the present invention is not limited to this, and the present invention is not limited to this. It can also be applied to an inkjet printer that records an image on a recording medium by ejecting the ink.

<Other Embodiments> Next, a recording apparatus employing a method of ejecting ink by heating ink liquid using such an electrothermal converter will be described.

In this embodiment, a serial type bubble jet recording method, which is one of the inkjet recording methods described above, is used as a recording means.

FIG. 11 is an explanatory diagram of an exploded configuration of the recording head (2) constituting the recording means, and FIGS. 12(a) to (g) are explanatory diagrams of the bubble jet recording principle. For its typical configuration and principle, see, for example, U.S. Patent No. 4,723,129.
No. 4,740,796.

In Fig. 11, ■a is a heater board, and an electrothermal converter (discharge heater) ■b and an electrode ■C made of aluminum or the like for supplying power to this are formed and arranged on a silicon substrate. has been done. A top plate (e) having a partition wall for partitioning a liquid path (nozzle) (d) for recording liquid is adhered to the heater board (a). Furthermore, an ink cartridge for supplying ink to the recording head (2) is replaceably attached to a predetermined position of the apparatus.

The ink supplied from the ink cartridge through the conduit is filled into the common liquid chamber ■g in the recording head ■ from the supply port ■f provided on the top plate ■e, and this common liquid output ■g
The liquid is guided into each nozzle d. Ink ejection openings h are formed in these nozzles d, and the ejection openings h are formed at a predetermined pitch in the sheet conveyance direction so as to face the recording sheet of the recording head II.

In this embodiment, the recording head (2) having the above configuration is mounted on a reciprocally movable carriage, and recording is performed by ejecting and flying ink from the recording head (2) in synchronization with the movement of the carriage.

Here, the principle of ink flight in the bubble jet recording method will be explained with reference to FIGS. 12(a) to 12(g).

In the steady state, as shown in Fig. 12(a), the nozzle ■d
The surface tension and external pressure of the ink (2) filled inside are balanced on the ejection port surface. In order to make the ink (2) fly in this state, the electrothermal converter (2) in the nozzle (2) is energized to cause the ink in the nozzle (2) to rapidly rise in temperature beyond nucleate boiling. Then, as shown in FIG. 12(b), the ink adjacent to the electrothermal converter (b) is heated to produce microbubbles, and the ink in the heated area is vaporized to cause film boiling, resulting in As shown in Figure 12 (C), the bubbles ■
grows rapidly.

When the bubble (2) grows to its maximum size as shown in FIG. 12(d), an ink droplet is extruded from the ejection opening in the nozzle (2) d. Then, when the electricity is turned off to the electrothermal converter ■b, the grown bubbles ■ are transferred to the nozzle ■, as shown in Fig. 12(e).
The ink (d) in the ink (d) cools and contracts, and the growth and contraction of this bubble causes ink droplets to fly from the ejection port. Furthermore, as shown in FIG. 12(f), the ink comes into contact with the surface of the electrothermal transducer (2) and is rapidly cooled, and the bubble (2) disappears or shrinks to an almost negligible volume. When the bubble (2) contracts, ink is supplied into the nozzle (2) from the common liquid chamber (2) by capillary action, as shown in FIG. 12(g), in preparation for the next energization.

Therefore, an ink image is recorded on a recording sheet by reciprocating a carriage carrying such a recording head and energizing the electrothermal transducer (b) in synchronization with this movement in accordance with an image signal.

Note that the configuration of the recording means includes the above-mentioned ejection port, liquid path,
In addition to the combination of electrothermal converters, U.S. Pat.
What is disclosed in Japanese Patent Application Laid-Open No. 59-123670 and the like can also be adopted.

Further, although the above-described recording means is an example in which ink is supplied to the recording head from an ink cartridge installed in the recording apparatus, an ink storage chamber is provided in the recording head,
A disposable type recording head may be used, which is replaced when the ink storage chamber runs out of ink.

Further, in the embodiments described above, a serial type bubble jet recording method was exemplified, but the present invention can also be applied to a line type recording method.

In addition, the recording device of the present invention can be used as a printer as an image output terminal for information processing equipment such as a computer, a copying device combined with a league, etc., and a facsimile device having a sending/receiving function. It will be done.

[Effects of the Invention] As explained above, according to the present invention, by adjusting the amount of energy applied to each electrothermal converter block of the recording head according to the resistance of the power supply line corresponding to each block, This has the effect of eliminating the recording density difference between each block and recording one line with uniform density.

[Brief explanation of drawings]

Figure 1 is a block diagram showing the connection and configuration of the control unit and recording unit of the thermal printer of this embodiment, Figure 2 is a diagram showing the configuration of the recording unit of the thermal printer of this embodiment, and Figure 3 is the embodiment. 4 is a timing chart showing the heat generation driving method of the first embodiment. FIG. 5 is a flowchart showing the recording process of the thermal printer of the first embodiment. A diagram showing the recording timing of the thermal printer of the second embodiment; FIG. 7 is a diagram showing the configuration of the recording section of a conventional thermal printer; FIG. 8 is a schematic diagram showing the configuration of a general thermal head; The figure shows the circuit configuration of the thermal head in Figure 6.
FIG. 10 is a diagram showing the drive timing of a conventional thermal head, FIG. 11 is an explanatory diagram of an exploded configuration of a recording head of another embodiment, and FIGS. 12(a) to (g) are bubbles of another embodiment. FIG. 3 is an explanatory diagram of the jet recording principle. In the figure, 9...Ground line, 11...Platen roller, 11...Thermosensitive recording sheet, 20...Thermal head, 21...Shift register, 22...Latch circuit, 23... Heat generating resistor, 23a to 23d...Block of heat generating resistor, 24...Common electrode wire, 25...Temperature sensor, 26...Power source, 27.29...Drive circuit, 28... Recording paper conveyance motor, 30...cutter,
31... Recording paper sensor, 101... Control unit, 102
...Recording unit, 111...CPU, 112...RO
M, 113...RAM. 10 Figure 2 Figure 3 ATA Figure 4 DATA Figure 6 0 Figure 8 D ATA Figure 10 Figure 2

Claims (8)

[Claims] (1) A method for driving a recording head in which a plurality of electrothermal transducers are arranged in a line and an image is recorded on a recording medium by energizing the electrothermal transducers, the method comprising: A method for driving a recording head, characterized in that the recording head is divided into a plurality of blocks, and the amount of energy applied to each block is adjusted according to the resistance value of a power supply line to each of the blocks. (2) The resistance value is connected to the power input terminal of the recording head;
2. The recording head driving method according to claim 1, wherein the determination is made according to the length of the power supply line to each of the blocks. (3) The method for driving a recording head according to claim 1, wherein the applied energy is controlled by the width of a current pulse applied to the block. (4) A recording apparatus including a recording head which arranges a plurality of electrothermal transducers in a line and records an image on a recording medium by energizing the electrothermal transducers, wherein the plurality of electrothermal transducers of the recording head The amount of energy applied to each of the blocks is adjusted according to a drive means that divides the electrothermal converter into a plurality of blocks and drives them to generate heat, and a resistance value of a power supply line to each of the blocks in the recording head. an adjusting means; and a control means for transferring print data to the recording head, applying applied energy adjusted by the adjusting means to each of the blocks, and controlling the driving means to perform recording. A recording device characterized by: (5) The resistance value is connected to the power input terminal of the recording head;
5. The recording apparatus according to claim 4, wherein the determination is made according to the length of the power supply line to each block. (6) The recording apparatus according to claim 4, wherein the recording apparatus uses an inkjet recording method in which the recording means performs recording by ejecting ink in response to a signal. (7) The recording apparatus is an inkjet recording system in which the recording means energizes an electrothermal transducer in response to a signal and ejects ink using thermal energy from the electrothermal transducer to perform recording. 7. The recording device according to claim 6. (8) In the recording device, the recording means energizes the electrothermal transducer in response to a signal, and the ink is ejected from the ejection port by the growth of bubbles generated by heating exceeding film boiling by the electrothermal transducer. 8. The recording apparatus according to claim 7, wherein the recording apparatus uses a bubble jet recording method.