JPH03293149A - Temperature control of ink jet recording device - Google Patents

Abstract

PURPOSE:To ensure that significant cost cut and remarkable yield improvement can be achieved by providing a constitution in which the temperature of a recording head is estimated based on a temperature of an electronic element which drives a thermal energy generation element of a recording head. CONSTITUTION:When a predetermined pattern is continuously recorded in a recording medium to measure the temperature of a base plate of a recording head and that of a power transistor 8a simultaneously, the temperature of the power transistor 8a increases in proportion to that of the recording head 2. Then the temperature of the recording head 2 is measured by recording the temperature of the power transistor 8a using a temperature sensor 9. In addition, it is ensured that the temperature of the recording head 2 is decided readily based on the temperature of the power transistor 8a by selecting between power transistors so that the thermal capacity of the power transistor 8a becomes the same as that of the recording head 2 or junctioning a heat release plate or calculating the temperature of MPU 17 in such a manner that it is corrected. Subsequently, a variation in temperature measurement of the recording head can be eliminated and thereby a significant cost reduction and a remarkable yield improvement are ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a temperature control method for an inkjet recording apparatus that performs recording by ejecting ink from a recording head onto a recording material 62.

[Conventional technology]

2. Description of the Related Art Recording devices such as printers, copiers, and facsimile machines are configured to record images consisting of dot patterns on recording materials such as paper and plastic soda plates based on image information.

The recording device may be an inkjet type,
It can be divided into wire dot type, thermal type, laser beam type, etc. Among these, inkjet type (inkjet recording device) ejects ink (recording liquid) droplets from the ejection opening of the recording head and sprays them onto the recording material. It is configured to be attached and recorded.

In recent years, many recording devices have come into use, and these recording devices are required to have high speed recording, high resolution, high image quality, low noise, and the like.

In addition, mono-shell O typified by laptop computers
With the advent of A-devices, there has been a demand for portable, inexpensive, and compact recording devices, and even such flexible recording devices are required to have high resolution and high image quality.

An example of a recording device that meets such demands is the inkjet recording device.

In an inkjet printing apparatus, printing is performed by ejecting ink from a printing head, and therefore, the temperature of the printing head largely affects the recording apparatus.

By the way, in conventional inkjet printers, there is a method in which an expensive temperature detection element and a heating device are provided in the print head section, and the temperature of the print head is controlled within a desired range based on the detected temperature of the print head. was taken.

Moreover, in the recording heads of inkjet recording devices, day sports pull cartridge type recording heads, which integrate the head and ink tank, are becoming mainstream in view of ease of maintenance due to the increase in personal use. The conventional temperature control method using the above-mentioned expensive temperature detection element has the technical problem of increasing the cost of the recording head and increasing the maintenance cost.

Furthermore, in the above conventional temperature control method, the following) and 1
There were also technical issues as explained in 1).

) There were variations in temperature measurements due to variations in the temperature sensor.

Since the disposable recording head is a consumable item, when viewed from the recording apparatus main body side, a temperature sensor whose characteristics vary each time the recording head is replaced is connected.

In particular, in film boiling type inkjet recording heads that use electrothermal converters, the ejection energy generating element (heater) is manufactured using a semiconductor process, so from the perspective of cost reduction, a diode sensor for temperature detection of the recording head is used. It is an essential condition that these components are created in the same process.

Therefore, temperature sensors cannot be selected and retrofitted, and, for example, the measured value of environmental temperature may differ by 15° C. or more between manufacturing lofts.

For this reason, in closed-loop temperature control using a temperature sensor in the recording head, it is necessary to adjust the fluctuations of the sensor in the adjustment process, or to measure and rank the temperature sensor and then install it in the recording apparatus main body and then use it for adjustment. Complicated adjustment work such as correction using a changeover switch was required.

The increase in manufacturing costs and the deterioration of usability caused by these adjustment operations were extremely large.

In addition, the increase in the number of signal processing points associated with the above adjustment work, as well as the significant increase in MPU processing due to the closed loop itself, place a large burden on the design of a compact and general-purpose recording device body. .

11) Since electrostatic countermeasures and noise countermeasures are required, miniaturization and cost reduction are difficult.

Since the disposable recording head is a consumable item, the user must frequently attach and detach the recording head from the main body of the apparatus.

Therefore, the contacts on the device main body side are always exposed.

Additionally, since the output of the semiconductor sensor passes from the disposable recording head, through the carriage, and then through flexible wiring, it is guided as it is to the circuit on the printed circuit board of the main body of the device, making the temperature measurement circuit extremely susceptible to static noise. Become.

Furthermore, in a small and portable inkjet recording device, the outer casing does not have a sufficient shielding effect, making the temperature measurement circuit even more susceptible to electrostatic noise.

Therefore, with conventional temperature detection means, it is necessary to add electrostatic shields and anti-electrostatic parts at various locations because of one temperature sensor, making it difficult to miniaturize the recording device, reduce costs, and maintain image quality. Met.

The present invention has been made in view of the technical problems of the prior art, and it is possible to eliminate the need for an expensive print head temperature sensor and also to eliminate variations in the temperature measurement values of the print head, resulting in a significant cost reduction. It is an object of the present invention to provide a temperature control method for an inkjet recording apparatus that can achieve a significant improvement in yield.

[Means for solving problems]

The present invention provides an inkjet recording apparatus that performs recording by ejecting ink onto a recording material from a recording head having a thermal energy generating element, in which recording is performed based on the temperature of an electronic element that drives the thermal energy generating element of the recording head. By adopting a configuration that estimates the head temperature, it is possible to eliminate the need for an expensive print head temperature sensor and eliminate variations in print head temperature measurements, resulting in significant cost reductions and significant yield improvements. The present invention provides a method for controlling the temperature of an inkjet recording apparatus.

The thermal energy generating element in the present invention may be either or both of a head heater and an ink bubble forming heater.

〔Example〕

Hereinafter, the present invention will be specifically described with reference to the drawings.

Example I: FIG. 1 is a schematic perspective view illustrating an ink jet recording apparatus suitable for implementing the temperature control method according to the present invention.

The inkjet recording apparatus of this embodiment has a head cartridge that integrates a recording head and an ink tank mounted on a carriage that moves along a recording material P such as paper or a thin plastic plate, and while scanning with the recording head. It is a serial scan type that performs recording.

In Figure 1, ■ is an ink tank, and 2 is a recording medium.
, Soto.

The recording head 2 is an inkjet recording head that discharges ink using thermal energy, and is equipped with an electrothermal converter for generating thermal energy.

Further, the inkjet recording head 2 performs recording by ejecting ink from the ejection ports by the growth of bubbles due to film boiling caused by thermal energy applied by the electrothermal converter.

These ink tank I and recording head 2 are integrated, and constitute a disposable (replaceable) head cartridge as a whole. FIG. 2 is a schematic perspective view of this head cartridge, and shows the recording head 2. The front surface is an ejection port surface having a plurality of ink ejection ports 15.

In FIG. 1, the head cartridge is mounted on a carriage 3, and the carriage 3 is guided by a guide rail 4 and reciprocates in the six directions of arrows so as to move along a recording material P.

The recording material P is attached to a platen roller 5 that forms a recording surface.
and is conveyed in the direction of arrow f by driving the platen roller.

Reference numeral 6 denotes a flexible cable in which a signal line, etc., for passing a signal pulse current for ink ejection and a current for adjusting the temperature of the print head to the print head 2 through the carriage 3 is assembled.

7 is a printed circuit board equipped with an electric circuit for controlling the recording device.

In the illustrated example, the printed circuit board 7 includes a power transistor 8a for a constant voltage source for the head drive, and a temperature sensor 9.
, A/D Funharta 16, and microprocessing unit (MPU) 17.

The power transistor 8a is one of the components constituting the electric circuit of the printed circuit board 7, and controls the signal current for ejecting ink from the recording head 2. ff1l.

The temperature sensor 9 is a temperature sensor made of a thermistor or the like for measuring temperature, and is attached so as to be in contact with the power transistor 8a.

The A/D converter 16 is for converting an analog signal from the temperature sensor 9 into a decile signal.

The microprocessing unit (MPU) 17 controls each part within the recording apparatus and performs processing procedures such as temperature control.

The third part is a partial perspective view showing details of the recording sheet 2.

In FIG. 3, on the base plate 14, there are formed a liquid passage 10 that communicates with each discharge port 15 and a liquid chamber 13 for supplying ink to each liquid passage. An ejection heater 11 is disposed within the ink jet 10 as an ejection energy generating element for imparting ejection thermal energy to the ink within the liquid path.

When recording, first, ink is filled from the ink tank 1 into the liquid chamber 3 and each liquid path 10 through an ink supply pipe (not shown).

Next, an electric signal (such as an image signal) is applied from the printed circuit board 7 through the flexible cable 6 to energize each discharge heater 11 .

As a result, each ejection heater 11 generates heat, bubbles are instantaneously generated in the ink in that portion, and the ink on the downstream side of the ejection heater 11 is ejected from each ejection port 15 to form flying ink droplets.

Recording is performed by depositing these ink droplets on a recording material P such as paper.

The fourth is a graph showing the results of simultaneously measuring the temperature of the head plate 14 of the recording head 2 and the temperature of the power transistor 8a when a predetermined pattern is continuously recorded on eight recording materials using the above inkjet recording apparatus. .

2. As shown in FIG. 4, the temperature of the power transistor 8a increases by 1 as the temperature of the recording head 2 increases.

Therefore, the temperature of the recording head 2 can be measured by reading the temperature of the power transistor 8a as the drive electronic element with the temperature sensor 9.

FIG. 5 is a block diagram of a control system suitable for implementing the temperature control method according to the present invention.

As mentioned above, there is a correlation between the temperature of the recording head 2 and the temperature of the power transistor 8a, but from the phase jp of the heat capacity of the recording head 2 and the power transistor 8a,
There are cases where the temperature rise curves of +15, etc. are not the same.

Therefore, a power transistor is selected so that the heat capacity of the power transistor 8a is the same as that of the recording head 2, a heat sink is further coupled to the power transistor, or the temperature of the power transistor 8a of the MPU 174 is adjusted. Calculation processing for correction is performed so that the temperature of the recording head 2 is uniquely determined from the temperature of the power transistor 8a, and when the temperature is below a predetermined temperature, ink is not supplied to the ejection heater 11 during non-recording. The recording head 2 is heated by applying a short pulse that does not cause bubbles to eject. When the temperature reaches a predetermined temperature or higher, the application of the short pulse to the ejection heater during non-recording is stopped and the temperature of the recording head 2 is lowered. Do 8 rounds so it doesn't rise too high.

Embodiment ■: FIG. 6 is a partial perspective view showing the recording head 2 used for temperature control according to this embodiment. Separately from the ejection heater 11 of the path 10, a sub-heater 12 for heating the recording head 2 is provided.

FIG. 7 is a sectional view showing a part of the printed circuit board 7 in this embodiment. In the same figure, in addition to the power transistor 8a for driving the recording head, there are also transistors on the printed circuit board 7 for driving the sub-heater 12. A power transistor 8b as a constant voltage source is provided, and a temperature sensor 9 is placed in contact with each of these power transistors 8a, 8b.

FIG. 8 is a block diagram of a control system suitable for carrying out the temperature control method of this embodiment.

In FIG. 8, the power transistors are selected so that the heat capacity of each of the power transistor 8a for driving the ejection heater and the power transistor 8b for driving the sub-heater is half of the heat capacity of the recording head 2. Furthermore, since there is no need to combine heat sinks, the temperature of the power transistors 8a and 8b is set to rise twice as much as the temperature of the recording head 2.

Therefore, the temperature of these power transistors 8a and 8b is measured by a temperature sensor 9, converted into a digital signal by an A/D converter 16, and then integrated by an MPU 17.
By multiplying this by a correction coefficient, the temperature of the recording head 2 is uniquely determined from the respective temperatures of the two power transistors 8a and 8b.

Alternatively, a temperature sensor for detecting room temperature may be provided separately, and the measured temperature may be corrected by combining it with the two temperature sensors 9.9 attached to the two power transistors 8a and 8b described above.

When the temperature measured from the two power transistors 8a and 8b falls below a predetermined temperature, the sub-heater 12 is turned on to heat the recording head 2 by applying a short pulse that does not cause the ink to bubble and eject.

On the other hand, when the temperature measured from the two power transistors 8a and 8b exceeds a predetermined temperature, the sub-heater 1
By performing at least one of the operations of turning off the gutter 2 and stopping the application of short pulses to the ejection heater 11 during non-recording, the temperature of the gutter 2 during recording is adjusted so that it does not become too high. .

Embodiment 2: FIGS. 9A and 9B are partial cross-sectional views of a printed circuit board 7 for controlling the temperature of this embodiment.

6 In (A) of FIG. 9, one temperature sensor 9 is in contact with the power transistor 8a for driving the discharge heater and the power transistor 8b for driving the sub-heater.

On the other hand, in FIG. 9(B), the power transistor 8a for driving the discharge heater and the power transistor 8b for driving the sub-heater are arranged on the heat sink 18 in contact with each other, and furthermore, the temperature sensor 9 is placed on the heat sink 18. arranged to be thermally coupled.

The temperature control method of this embodiment can be implemented using a control system having substantially the same configuration as the block diagram shown in FIG. 8 described above.

In the case of (A) in FIG. 9, two power transistors 8
The total heat capacity of a and 8b is selected to be the same as the heat capacity of the recording head 2, or the analog signal of the temperature sensor 9 is converted into digital by the A/D converter 16, and then the MPU 17 performs correction calculation processing. The temperature of the recording head 2 is set to be determined uniquely from the temperature measured by the temperature sensor 9, and when the temperature falls below a predetermined temperature, the recording head 2 is heated by at least one of the sub heater 12 and the discharge heater 11. The temperature of the recording head 2 is controlled by stopping heating of the recording head 2 by at least one of the sub-heater 12 and the ejection heater 11 when the temperature reaches a predetermined temperature or lower.

In the case of (B) in FIG. 9, two power transistors 8
Select so that the total heat capacity of a, 8b and the heat sink 18 is the same as the heat capacity of the recording head 2, or convert the analog signal of the temperature sensor 9 into digital with the A/D converter 16 and then correct it with the MPU 17. By performing arithmetic processing, the temperature of the throat 2 is set to be determined uniquely from the temperature measured by the temperature sensor 9 to the record, and as in the case described above, when the temperature falls below a predetermined temperature, the sub-heater 12 and the discharge At least one of the heaters 11 heats the recording head 2, and when the temperature reaches a predetermined temperature or higher, the heater 1
The temperature of the print head 2 is controlled by stopping heating of the print head 2 by at least one of the ejection heater 11 and the ejection heater 11.

Embodiment ~ ": FIG. 10 is a partial cross-sectional view of the printed circuit board 7 for controlling the temperature of this embodiment, and FIG. 11 is a block diagram showing a control system suitable for controlling the temperature of this embodiment. It is a diagram.

In FIG. 10, the temperature sensor 9 is arranged near the power transistor 8a for driving the discharge heater.

In this case, in order for the temperature sensor 9 to efficiently sense the radiant heat and convection heat from the power transistor 8a for driving the discharge heater, the temperature sensor 9 must be connected to the power transistor 8a for driving the discharge heater, since heat tends to accumulate in the upper part. It is preferable to install it at a position slightly higher than the height of the heat generating source.

In FIG. 11, the control system of this embodiment includes a discharge heater 1
The radiant heat and reflected heat from the power transistor 8a of 1 are measured by the temperature sensor 9, the analog signal from the temperature sensor 9 is converted into a digital signal by the A/D converter 9 1G, and then the correction calculation process is performed by the MPU 17. The setting is such that the temperature of the recording head 2 can be estimated by performing the following steps.

With such a control system, the temperature of the recording head 2 can be stably controlled to a predetermined temperature.

According to each of the embodiments described above, there is no need to perform closed-loop temperature control using a temperature sensor built into a conventional recording head, and the temperature sensor 9 in the recording apparatus main body is used to control the recording head 2. By measuring the temperature of the exothermic power transistor (driving element) to which thermal energy is input, the temperature of the recording head 2 can be indirectly measured and the temperature of the recording head 2 can be controlled to a desired temperature. It has become possible.

In addition, especially when using a cartridge-type disposable type recording head (head car 1 to cartridge) in which the recording head 2 and ink tank 1 are integrated, there is no need to detect the signal current of the temperature sensor from the recording head. , the biggest technical problem in temperature control when using a disposable type, namely the problem of variations between temperature sensor recording heads (for example, replaceable head cartridges), can be solved, and therefore the recording Variations in recording performance between heads have been eliminated, and it has become possible to easily record images of constant image quality.

Furthermore, since the temperature sensor can be eliminated from the cartridge cartridge of the recording head, which is a consumable item, it is also possible to eliminate the temperature sensor selection process and temperature sensor alignment process that were previously required, making it possible to significantly reduce costs. became.

Furthermore, since there is no temperature sensor itself, the yield of recording heads is greatly improved, and in this respect, it is also possible to significantly reduce costs.

Also, from an electrical circuit perspective, it is no longer necessary to detect minute signal currents from the recording head, and there is no need to expose the contacts when the disposable recording head (henno cartridge) is attached to or removed from the recording apparatus body. It was also possible to simplify or omit measures for electrostatic discharge and the like against the pattern Q of flexible wiring and printed circuit boards leading to the recording head.

The point that such means can be simplified or omitted is 1-￥
It is extremely useful for recording devices of types where it is difficult to provide adequate shielding on the exterior or electric circuits, such as small and portable recording devices, and it also has a significant cost reduction effect. It's a big deal.

In each of the above-mentioned embodiments, the case where a disposable cartridge-type recording head is used is exemplified, but the temperature control force method according to the present invention is not limited to this, and can be applied to a type of recording head that hardly requires replacement. It can be carried out in the same manner and the same effect can be achieved when using .

Further, in each of the above embodiments, a power transistor is used as a driving element for inputting thermal energy into the recording area 7. However, this driving element is not limited to a power transistor.

In the above embodiments, the temperature control method of the present invention was applied to a serial scan type inkjet printer using a serial scan type inkjet recording head in which a recording head (head cartridge) is mounted on a carriage 3. Although the present invention is applicable to other recording methods, such as a line-type inkjet recording device that uses a hollow-type inkjet recording head that covers the recording area in the paper width direction of the recording material, the present invention is applicable to other recording methods. It can also be applied to the Ink Geno I recording device, and similar effects can be achieved.

Further, the present invention can be applied regardless of the number of recording heads.

INDUSTRIAL APPLICABILITY The present invention provides excellent effects particularly in inkjet recording apparatuses that use a membrane boiling type inkshet type recording head among inkjet recording types.

As for typical configurations and principles thereof, it is preferable to use the basic principles disclosed in, for example, US Pat. No. 4,723,129 and US Pat. No. 4,740,796.

This method can be applied to both the so-called on-demand type and the continuous type, but especially in the case of the on-demand type, it is necessary to place the liquid (ink) on the sheet or liquid path where it is held. The electrothermal transducer is configured to generate thermal energy by applying at least one drive signal that corresponds to recorded information and causes a rapid temperature rise exceeding nucleate boiling to the electrothermal transducer being recorded. This is effective because it causes film boiling on the heat acting surface of the ink, resulting in the formation of bubbles in the liquid (ink) in one-to-one correspondence with this drive signal.

Due to the growth and contraction of these bubbles, liquid (
eject ink) to form a small droplet (at least one droplet).

If this drive signal is in the form of a pulse, bubble growth and contraction will occur immediately and appropriately, so liquids with particularly excellent responsiveness (
Ink) can be ejected, which is more preferable. As this pulse-shaped drive signal, those described in US Pat. No. 4,463,359 and US Pat. No. 4,345,262 are suitable.

4. If the conditions described in the specification of US Pat. No. 4,313,124 concerning the temperature increase rate of the heat acting surface are adopted, it is possible to perform recording with no problem in recording.

The configuration of the recording head includes, in addition to the combined configuration of ejection ports, liquid paths, and electrothermal converters (straight liquid flow path or right-angled liquid flow path) as disclosed in the above-mentioned specifications, a heat acting section. U.S. Pat. No. 4,558,333 and U.S. Pat. No. 4,459,600 disclose a configuration in which the
The present invention also includes a configuration using the specification of the above specification.

In addition, Japanese Patent Application Laid-Open No. 123670 of 1982 discloses a configuration in which a common sliding slint is used as a discharge part for a plurality of electrothermal converters, and a hole absorbing pressure waves of thermal energy is disclosed. The present invention is also effective as a configuration based on Japanese Patent Application Laid-Open No. 138461 of 1981, which discloses a configuration in which a discharge portion corresponds to a discharge portion.

Furthermore, as a full-line type recording head having a length corresponding to the width of the maximum recording medium that can be recorded by the recording apparatus, the length can be increased by combining multiple recording heads as disclosed in the above-mentioned specification. Either a configuration satisfying the above conditions or a configuration as a single recording head formed integrally may be used, but the present invention can more effectively exhibit the above-mentioned effects.

In addition, a replaceable deep-type recording head that is attached to the main body of the apparatus enables electrical connection with the main body of the apparatus and supply of ink from the main body of the apparatus.
The present invention is also effective when using a cartridge type recording head that is integrally provided in the recording head itself.

Further, it is preferable to add a recovery means for the recording head, preliminary auxiliary means, etc., which are provided as a configuration of the recording apparatus of the present invention, because the effects of the present invention can be further stabilized.

Specifically, these include capping means, cleaning means, pressure or suction means, preheating means for the recording head using an electrothermal transducer or another heating element, or a combination thereof. It is also effective to perform a preliminary ejection mode in which ejection is performed separately from printing in order to perform stable printing.

Furthermore, the recording mode of the recording device is not limited to a recording mode in which only the mainstream color such as black is used; the recording head may be configured integrally or in combination with a plurality of recording heads; The present invention is also extremely effective for devices equipped with at least one full color image.

In the embodiments of the present invention described above, the ink is described as a liquid, but it is an ink that solidifies at room temperature or lower, and is softened or liquid at room temperature, or in the above-mentioned inkjet method 1-, the ink itself is C or above 70°C
Since the temperature is generally controlled within the following range to keep the viscosity of the ink within the stable ejection range, it is sufficient if the ink is in a liquid state when the recording signal material I is used.

In addition, the temperature increase caused by thermal energy is actively used as energy to change the ink from a solid state to a liquid state, or the ink is left to solidify to prevent evaporation. In any case, the ink may be liquefied by applying thermal energy according to the recording signal and ejected as a liquid ink, or the ink may already begin to solidify when it reaches the recording material. It is also applicable to the present invention to use inks that are liquefied only by thermal energy.

In such a case, as in JP-A-54-56847, the ink is held in a liquid or solid state in the recesses or through-holes of the porous sheet 1 and is placed facing the electrothermal converter. It is also possible to take a form such as

In the present invention, the most effective method for the above-mentioned ink is to perform a film boiling method with lower IA, which is a high temperature condition.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, in an inkjet recording apparatus that performs recording by ejecting ink onto a recording material from a recording head including a thermal energy generating element, Since the temperature of the print head is estimated based on the temperature of the electronic element that drives the energy generating element, it is possible to eliminate the need for an expensive print head temperature sensor and to eliminate variations in the measured temperature values of the print head. I can do it,
Provided is a temperature control method for an inkjet printer I/recording W device that can significantly reduce costs and greatly improve yield.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing an inkjet recording apparatus suitable for implementing temperature control according to the first embodiment of the present invention, and FIG. 2 is a schematic perspective view showing a printing head during the first printing. 3 is a schematic partial perspective view showing the structure of the recording head in FIG. 1; FIG. 4 is a graph showing the relationship between the temperature of the recording head and the temperature of the power transistor for driving the ejection heater in FIG. 1; FIG. 5 is a block diagram showing the temperature control system of the recording head in FIG. 1, and FIG. 6 is a schematic partial perspective view showing the structure of the recording head for temperature control according to the second embodiment of the present invention. , FIG. 7 is a sectional view of the printed circuit board in the second embodiment of the present invention, and FIG. 8 is a temperature side view of the second embodiment of the present invention. FIG. 9 is a cross-sectional view of the printed circuit board used in the third embodiment of the present invention.
0 is a sectional view of a printed circuit board used in the fourth embodiment of the present invention, and FIG. 11 is a schematic diagram of the control system of the fourth embodiment of the present invention. Below, symbols representing main components in the drawings are listed. 2----1 recording head, 3----carriage, 5-.
Platen roller, 6 ------- Flexible cable, 7 ------- Printed circuit board, 8 a -1---
Power transistor for driving discharge heater, 8 b---
--Power transistor for driving sub-heater, 9---
~-Temperature sensor, 10 liquid paths, 11-----one discharge heater, 12'----sub heater, 11-hair plate, 15----one discharge port, 16----"A/D
Converter, L 7-=-- M PU, 18--
-1 heat dissipation plate, P---1 recording material.

Claims (6)

[Claims] (1) In an inkjet recording apparatus that performs recording by ejecting ink onto a recording material from a recording head having a thermal energy generating element, the recording head 1. A temperature control method for an inkjet recording device, the method comprising estimating the temperature of an inkjet recording device. (2) The inkjet according to claim 1, further comprising a temperature detection element for detecting the temperature of the drive electronic element, and controlling the temperature of the drive electronic element to a target value based on the output of the temperature detection element. Temperature control method for recording device. (3) The temperature control method for an inkjet recording apparatus according to claim 2, wherein the temperature detection element is arranged on a printed circuit board. (4) The temperature control method for an inkjet recording apparatus according to claim 2, wherein the temperature detection element is arranged at or near a position in contact with the drive electronic element and has a thermal correlation with each other. (5) The temperature control method for an inkjet recording apparatus according to claim 1, wherein the drive electronic element is an electrothermal converter for generating thermal energy. (6) The temperature control method for an inkjet recording apparatus according to claim 5, wherein the ink is ejected from the ejection port by the growth of bubbles due to film boiling caused by the thermal energy applied by the electrothermal converter.