JP3408787B2 - Ink jet recording method and ink jet printer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording method of a type in which thermal energy is used to cause ink droplets to fly toward a recording medium, and an ink jet printer using the same.

[0002]

2. Description of the Related Art An ink jet recording apparatus of a type in which a part of ink is rapidly vaporized by pulse heating and an ink droplet is ejected from an orifice by its expansive force is disclosed in JP-A-48-9622 and JP-A-54-54. No. 51837, for example.

The simplest method of this pulse heating is to energize the heating resistor with a pulse, and the specific method is the hard copy advanced technology research group (February 1992) sponsored by the Japan Institute of Industrial Technology. Held on 26th) or He
Published in wlett-Packard-Journal, Aug.1988. As shown in FIG. 8, the common basic structure of these conventional heat generating resistors is that the thin film resistor 43 and the thin film conductor 44 are covered with an antioxidation layer 45, and the cavitation destruction of the antioxidation layer 45 is prevented. Anti-cavitation layer 4 to prevent
6, 47 was coated with 1 to 2 layers.

[0004]

It is difficult to realize a large-scale line head in the conventional ink jet print head using such a heating resistor due to the limitation of the manufacturing technology, and almost all ink jet printers have a vertical length. It is a serial type that prints by scanning heads of several tens to several hundreds of nozzles arranged side by side in the lateral direction by the width of the recording paper.
For this reason, the recording speed is slow, and its improvement has been the biggest development issue in this field.

There are two methods to solve this development problem. One is to increase the recording speed by increasing the repetition period of ink ejection, and the other is to increase the number of nozzles. This is a method of improving the recording speed. However, even if the recording speed for recording the ink on the recording paper or the like can be improved by using such two methods, the problem that the ink cannot be dried in time is still unsolved.

Therefore, it is an object of the present invention to realize high speed printing of an ink jet printer by discharging ink to accelerate the drying of the ink recorded on a recording medium such as recording paper.

[0007]

In order to achieve the above object, the present invention provides a heater having a self-temperature control function as a heating source.
The present invention provides an ink jet recording method, wherein the recording medium is pressed and heated from the recording surface side by using the heating device, and then ink droplets are ejected onto the recording medium for recording.

In order to achieve the above-mentioned object, the present invention has a conveying means for conveying a recording medium, a recording section for recording on the recording medium, and a recording section arranged upstream of the recording section in the conveying direction. Using a heater with a self-temperature control function as a heating source,
An inkjet printer comprising: a heating device for heating the recording medium from the recording surface side by pressure.

Here, the heater is a PTC heater .
It is good to Further, the heating device may be a belt type heater. Further, the recording unit is provided on a Si substrate on which a driving integrated circuit is formed, and a thin film heating resistor array connected to the driving integrated circuit and a vicinity of the thin film heating resistor array on the Si substrate. A common ink groove, a connecting ink hole that communicates the common ink groove with the back surface of the Si substrate, and each heating resistor of the thin film heating resistor array provided on the front surface side of the Si substrate. , An individual ink passage that communicates each of the orifices with the common ink groove, and a mounting frame that is mounted on the back side of the Si substrate and has an ink supply passage that communicates with the connecting ink hole. It is preferable to have.

[0010]

With the above-described structure, the recording medium is heated from the recording surface side by pressure before the ink is ejected to record on the recording medium such as recording paper. Even if there is, the ink recorded and adhered on the recording medium dries rapidly, and high-speed printing becomes possible.

In particular, by making the structure of the recording section of the ink jet printer for ejecting ink droplets to record on the recording medium, as described in detail in the embodiments, the ink is supplied to the individual ink passages. Ink is sufficiently supplied from the common ink groove in the Si substrate, and ink is supplied from the mounting frame side to the common ink groove in the Si substrate from the ink groove (ink supply passage) in the mounting frame.
It can be sufficiently supplied through a plurality of connecting ink holes formed in the substrate, and further, for example, even a long Si substrate as a head for a line printer can be manufactured without impairing its mechanical strength. . This makes it possible to manufacture an inkjet printhead with several thousands of nozzles arranged in a two-dimensional structure in an integrated structure. Even a small line head for full color with 10,000 to 20,000 nozzles and an ultra-high-speed inkjet color printer using it can be realized. can do. Moreover, since the number of control signal lines and power lines for driving these is significantly reduced to about 10 to 20,
For example, the connection mounting of the line head is greatly simplified, which greatly contributes to the reduction in size and cost of the head and the printer.

[0012]

[Examples] In [Example 1] to [Example 5], a recording head used in an inkjet printer for high-speed printing will be described below. In [Example 6], a recording medium provided in an inkjet printer for high-speed printing will be described. The preheaters for heating the recording surface from the recording surface by pressure will be described.

[First Embodiment] FIG. 1 is a front view of an integrated type line head for an A4 full color ink jet printer as seen from the orifice side, and FIG. 2 is a side view thereof. In this head, for example, an orifice row in which 3024 orifices are arranged at a density of 360 dpi (dot / inch), that is, a black orifice row 2-1, a yellow orifice row 2-2, and a cyan orifice row 2- 3,
A total of 12096 orifice rows 2-4 for magenta are arranged in a length of 210 mm. The line head is set so that the orifice surface faces downward, for example, and is placed 1 to 2 mm away from the orifice surface in a direction perpendicular to the orifice row by A4.
Full-color recording is performed by ejecting color ink while running the paper at a constant speed. Assuming that the ink ejection frequency is 2 kHz
Even if it is delayed to z, full-color printing on A4 paper is completed in about 2 seconds. In the present embodiment, the sheet as the recording medium is fed at a constant velocity because the recording sheet is controlled to be fed at a constant velocity rather than stepwise as described later.

Further, in the present embodiment, ink ejection scanning is made continuous. This causes a problem of power consumption, that is, when the heating resistors of 3024 lines / line are collectively driven or block-driven, the conduction capacity of the thin film conductor, especially the common wiring conductor is often exceeded, and the maximum input power is increased. Has solved the problem. That is, 3024 dots / line is 500 μS (2 kHz)
That is, the ink is continuously ejected within the period of time, and this is repeated to print on the recording paper which is being conveyed at a constant speed. Since the pulse width applied to each dot is, for example, 1 μS, the dots in the ejection state (pulse is being applied) are always 6 consecutive dots or less and 2 dots until the printing of one page is completed.
This operation continues for a second. When operated in such a recording mode, the maximum input power is 3 because the input power required for ink ejection per dot is 0.5 W / dot.
It is as small as W or less (12 W or less in the case of full color recording). In the above example, the discharge frequency is 2k.
Although it is purposely slowing down to Hz, this is still 2 in A4 recording.
High-speed recording of 0 ppm (pages / minute) can be realized.

In the present embodiment, as described above, the line head continuously scans and prints on the recording paper conveyed at a constant speed.
At that time, the recording line is inclined by one dot. However, the amount is as small as 60 to 70 μm in the case of 360 dpi, which is not a problem in practical use. Moreover, 2
In the case of the present embodiment, which is a divided substrate, the size is further reduced to 30 to 4
It is 0 μm. In addition, the amount of deformation due to landing of ink droplets on the recording paper during traveling is about 1 μm, which is negligible compared to the recording dot size of 60 to 70 μmφ.

As described above, the line head of this embodiment is
Recording is performed by making ink ejection scanning continuous on a sheet that is a recording medium that is conveyed at a constant speed. This continuous ink ejection scanning produces an effect of simplifying the drive circuit. That is, the latch circuit, which is required for the conventional block drive or batch drive, is not required, and the heating resistor can be driven only by the shift register circuit and the driver circuit. The number of wirings required for driving these is only one for each of the data line, the clock line, the ground, and two for the power supply line, that is, a total of five wirings.

As described above, the continuous discharge scanning and the constant speed conveyance of the recording paper greatly reduce the maximum input power (1/2 to 1/3).
), Simplification of drive circuit and cost reduction (approx. 2/3),
Significant reduction in the number of wires required for drive control (1513 to 88
(Book → 5), the printing quality does not deteriorate even if the technically very difficult high-precision step transport is changed to the technically easy constant-velocity transport. The support for the various numerical values described here will be described in detail in the text to be described below.

Next, regarding the structure of the head, A- in FIG.
Description will be made also with reference to FIG. 3 showing the A ′ cross section.

Si substrate 9 on which a driving LSI is formed
The integrated line head on which the ink jet nozzle row is formed is die-bonded on the head mounting frame 3 in such a manner that inkjet printhead substrates (or simply referred to as head substrates) 1 and 1'having the same shape are butted at the center. Have been assembled. Head substrate 1, 1'is Si
Since it is made from a substrate, the head mounting frame 3 is S
The alloy is made of 42 alloy that is in good agreement with the coefficient of linear expansion of i, and after processing, Ni plating is applied to the entire surface to provide corrosion resistance. The reason why the ½ size head substrates 1, 1 ′ are butted against each other at the center is that the monolithic LSI head must be manufactured by a semiconductor process using a Si wafer, and currently a 6 inch wafer is used. Even so, only a head having a maximum length of about 140 mm can be obtained. Therefore, the dot density of the line head is determined by how far the distance between the adjacent orifices in the central portion can be reduced, and the practical limit for mass production is about 400 dpi. Of course, the head substrate 1, 1 '
It is needless to say that this limit will be eliminated by arranging the substrates so as to be displaced by the vertical width (about 8 mm) of the substrate.

The head substrates 1 and 1'each have 1512
Although the four orifices 2 are arranged side by side, the number of signal lines and power supply lines for driving the 1512 heating resistors 16 corresponding to the orifices 2 in each row is five as described above, so that four rows are required. Connector 20 attached to the back side of the head mounting frame 3 by connecting 20 pieces with tape carriers at both ends,
7 ', the tape carrier is fixed by being covered with the press fittings 4, 4'. The width of the head substrate 1, 1'is about 8
Since it is mm, the connection wiring density of the tape carrier at the substrate end is about 3 wires / mm, which is a level easy for connection mounting technology. On the other hand, if it is attempted to manufacture a head similar to that of this embodiment by the conventional technique, it is necessary to bond about 6000 wires with only one head substrate, and moreover, it is necessary to connect across a plurality of rows of orifices. Understand that it is technically impossible.

The ink is supplied from the respective supply ports 6 and 6 ', but as shown in FIG.
First, the black ink from -1 is the head mounting frame 3.
Ink groove 8-1 provided inside (ink supply passage)
Be led to. When this is seen in FIG. 4, which is a cross-sectional view taken along the line BB ′, the ink groove 8-1 in the head mounting frame 3 and the common ink groove 1 in the Si substrate 9 provided in parallel with the ink groove 8-1.
1-1 is communicated with a plurality of connecting ink holes 10-1 which are intermittently formed in the Si substrate 9,
A necessary and sufficient amount of black ink is supplied to the common ink groove 11-1 in the Si substrate 9. That is, the four color inks supplied from the ink supply ports 6 and 6 ′ do not mix with each other, and a necessary and sufficient amount of ink is supplied to the common ink groove 11 in each Si substrate.

Next, FIG. 5, which is an enlarged view of the C portion, and this D-
This will be described with reference to FIG. 6 which is a D ′ sectional view. The ink filled in the ink groove 11-3 in the Si substrate is guided to the individual ink passage 13-3 provided corresponding to each of the orifices 2-3, and is pulsed by the heating resistor 16 to generate heat. It is the same as a normal ink jet recording apparatus that instantaneously forms ink droplets from the orifice 2-3 and jumps out to perform dot recording on a recording paper (not shown) placed in front of the orifice 2-3. is there. In this embodiment, the heating resistor 16 and the wiring conductor 17 for supplying a current to the heating resistor 16,
No. 18, Cr-Si-described in Japanese Patent Application No. 5-68257.
A SiO alloy thin film resistor and a Ni thin film conductor were applied and the respective film thicknesses were set to about 700Å and 1 μm. In addition, the thin film resistor 16 and the wiring conductors 17 and 18 have about 150 below them.
Although a Ta ₂ O ₅ etching resistant layer having a thickness of 0Å and a SiO ₂ heat insulating layer having a thickness of about 2 μm are formed, their illustration is omitted. The resistance value of the thin film resistor 16 is about 1500Ω.

Individual N connected to each thin film resistor 16
The i wiring conductor 18 is connected to the collector electrode of the driving LSI 12-3 through the corresponding through hole connecting portion 20. The drive LSI 12-3 includes a shift register circuit and a driver circuit. And 151
The control wiring conductor 19 for sequentially driving the two heating resistors has one data line for sequentially sending 0 and 1 signals regarding ejection of each dot, and one clock line for defining the time, It suffices if there are five driver circuit power lines and one LSI device power line, and one ground line added to this. Since four drive control pedestals (connection pads for connecting to an external circuit formed on the Si substrate 9) for four colors are provided at the ends of the head substrates 1 and 1 ', control signals from the outside are provided. Has already been sent to these 20 pedestals through the connectors 7 and 7'and a connecting tape carrier (not shown).

The Si substrate 9 has a depth of about 150 μm
In order to form the ink groove 11 in the plate by photo etching
Is an inorganic resist (SiO₂Or
Si ₃N_FourLayer) or organic resist (polyimide type)
If you can. And Si substrate and head mounting frame
The connecting ink holes 10 between 3 are the same from the back surface of the Si substrate.
Formed by photoetching. Processing in this way
Adhesion of water resistant film resist to the surface of the finished Si wafer
However, the individual ink passage 13 corresponding to the orifice and the inside of the Si substrate are
Exposure so that the resist in the groove 11 is removed.
After development, the resist is hardened to form the partition wall 15, and
The PET film 14 with a thickness of about 50 μm is UV-cured
Glue with adhesive. Orifice in this PET film 14
2 is vertically applied by dry etching
It was In place of the water resistant film resist 15,
A polyimide material having excellent water resistance may be used. this
The water resistant coating 15 covers the entire area of the driving LSI device.
Covers and passivates water-based ink
It also plays an active role. Si U processed in this way
Cut the airfoil into a specified size, as shown in Fig. 1.
Completed as a head if mounted on the head mounting frame 3.
It It should be noted that the film layer of the portion for cutting the Si wafer is processed.
Gist and PET film are removed during photo etching
The better the cutting workability is.

The head manufactured in this manner was filled with each ink and a drive signal was sent from the connectors 7 and 7'for printing. The drive conditions in this case are summarized in Table 1.

[0026]

[Table 1]

The Cr-Si-SiO alloy thin-film resistor 16 / Ni thin-film conductors 17 and 18 employed in this embodiment, which have no protective layer for the heat-generating resistor, are very efficient due to the ultrashort pulse current heating of 1 μS or less. A good heater for inkjet printers is Japanese Patent Application No. 5-6825.
As described in No. 7. That is, the required applied energy per dot is 1/30 to 1/60 as compared with the heating resistor having the protective layer according to the prior art, and even if the heat outflow due to ink ejection is not considered, Highest increase per A4 size print (4 color solid print)
But the value is less than 1 ℃. In the case of the present embodiment, in which the input energy required for printing is extremely small, the relative ratio of the thermal energy carried out by the ejected ink becomes large, so A4
Even at the head temperature when 100 sheets of full-color printing were continuously printed, the increase was as small as 10 ° C. or less. This indicates that if natural heat dissipation fins are added to the head mounting frame 3, there is no need to cool or control the temperature even if high-speed printing is continuously performed. In the case of the prior art, almost all of the input energy of 30 to 60 times is used for heating the head, so that it is difficult to perform high-speed continuous printing as in the present embodiment in terms of heat. Of.

The driving conditions shown in Table 1 are the head substrate 1,
Scanning speed 3MHz from the leftmost dot for 1 '
Shows the case of sequentially and continuously driving. As another driving method at the same printing speed as this, there is a case in which the head substrates 1 and 1'are regarded as one line head and sequentially driven continuously from the left end dot at a scanning speed of 6 MHz. In this case as well, the driving is performed under exactly the same conditions as in Table 1 except for the above scanning speed, but the difference in the printing results is only that the inclination of the printing line is doubled to 60 to 70 μm. The amount is not a problem.

It is needless to say that the full-color high-speed printing image becomes a print close to a color photograph in this way, and in particular, constant-speed conveyance recording of recording paper is an important means for obtaining a high-quality image at low cost. I showed that. In order to realize the high-speed continuous printing shown in this embodiment at a practical level, it is necessary to embody a high-speed drying means for the printed ink, which will be described later.

[Embodiment 2] As disclosed in Japanese Patent Application No. 5-68257, the heating resistor composed of the Ta-Si-SiO alloy thin film resistor and the Ni thin film conductor is the Cr-Si described in the first embodiment. It shows almost the same characteristics as the heating resistor composed of the -SiO alloy thin film resistor and the Ni thin film conductor. Therefore,
When the same type of line head as in Example 1 was manufactured using the heating resistors made of the former combination and the same evaluation was performed, full-color printing under the driving conditions shown in Table 1 showed the same image quality as in Example 1. It turns out that can be obtained with.

[Example 3] As described in Japanese Patent Application No. 5-68257, Cr-Si-SiO or Ta-Si-S.
Ni is an optimum material for a thin film conductor having excellent electrolytic corrosion resistance to be used together with an iO alloy thin film conductor. However, for the W thin film conductor that shows the second best electrolytic corrosion resistance,
-Si-SiO or Ta-Si-SiO alloy thin film resistor, a reliability test in water of a heating resistor used as a thin film conductor was conducted, and it passed a continuous pulse application test of 1 billion pulses, and a Ni thin film conductor. It was found that the same performance as was exhibited. Since Ni is a ferromagnetic material, a special strong magnetic field magnetron sputtering apparatus is required for high-speed sputtering film formation, and there are manufacturing restrictions such as the necessity of processing on a line different from the semiconductor process line. On the other hand, although it is slightly inferior in electrolytic corrosion resistance, non-magnetic W can be processed in the same line as a semiconductor process by using a normal magnetron sputtering device.
It also has an advantageous characteristic that the electric resistance is smaller than that of Ni. Since it has passed the above-mentioned point in terms of practical life, it has been found that it can be practically used as a substitute material for Ni.

[Embodiment 4] In Embodiment 1, an example of an A4 full color line head was shown, but it goes without saying that a B4 full color line head can be manufactured by using a 6-inch wafer. However, in this way, the integration degree of the nozzles is increased, and the integration density of the nozzles is set to, for example, 60
A major problem encountered when setting 0 dpi is the problem of yield. It goes without saying that the basic problem to solve this is to improve the yield of the Si process, the yield of the heating resistor forming process, and the yield of the nozzle forming process formed on them. Another method is to make a head with a low degree of integration, assemble a non-defective head among them on a head mounting frame, and consequently make a head with a high degree of integration inexpensively.

For example, an attempt was made to make the A4 full-color line head shown in FIG. 1 from a monochromatic head substrate having a width of 2 mm, that is, one having one orifice array. When the monochromatic head substrate was cut out from the Si wafer, full dicing was performed so that the accuracy of the outer dimensions was within ± 3 μm.
Die-bonding was performed while the eight monochromatic head substrates thus prepared were butted against each other on the head mounting frame 3. However, an adhesive may enter between the chips, causing an assembly error in the distance between the lines. However, it was found that there was a maximum variation of 20 μm between the lines located at both ends. Therefore, a method of correcting this positional deviation by controlling the timing of ink ejection was adopted, and in practical use, an image having no difference with the 4-color integrated head substrate could be obtained. This correction amount can be easily adjusted by a method of using the adjustment test image by shifting the line driving timing by 7 μS / μm per assembly error.

[Embodiment 5] Although Embodiments 1, 2 and 3 are described on the premise of a line head, a head having a low degree of integration even when printing on recording paper of A3 size or more, or of A4 size. When printing with, it is necessary to print while the head scans the recording paper in the sub-scanning direction. In particular, when a low cost printer is required even if the printing speed is as low as several ppm, it may be advantageous to use a small head having a low degree of integration. Even in this case, the head having the structure described in the first and second embodiments can be used as it is, and the fact that the number of drive control signal lines is as small as 5 / color has an effect of significantly reducing the mounting cost around the head. It should be noted that the inclination of printing caused by sequentially and continuously ejecting ink can be easily solved by inclining the head by that amount and scanning, and therefore may be adopted as necessary. In this case, it is possible to use a method in which the head substrate is made in an inclined array in advance. Further, it is also effective to increase the ejection repetition frequency to the maximum of 5 kHz or to increase the printing speed as a high speed head by adopting a pumping heater described in Japanese Patent Application No. 5-68257.

[Embodiment 6] The ink jet print head described in Embodiment 1 is a line head for four full-color colors, and is an example in which the recording paper conveyance speed is 150 mm / S. In this case, the ink ejection frequency is intentionally slowed down to 2 kHz, but even with this, the ink on the recording paper cannot be dried in time, and it is necessary to provide a quick drying means for ink as described below.

FIG. 7 is a side sectional view for explaining the quick-drying means for the ink. As shown in FIG. 7, the quick-drying means is
PTC thermistor heater 31, heat insulation indicator 32, recording paper heating belt 33, drive roller 34, pressure roller 35
A heating device, which is a belt-type heater having a guide 36, sandwiches the recording paper 28 heated by the PTC thermistor heater 31 and the pressure roller 35, and holds the recording paper 28 on the recording surface side. The recording paper 28 is sent to the recording unit having the head 1 while being pressed and heated. This heating device does not raise the temperature above the Curie point of the PTC heater 31, that is, it has a self-temperature control function, and here the PT with a Curie temperature of about 150 ° C. is used.
The recording paper 28 is heated to a constant temperature of 80 to 90 ° C. by using the C heater. Further, although the recording paper 28 is pressed and conveyed by the pressure roller 35 in order to improve the heating efficiency, since the heating and conveying surface is flat, the envelope and the like can be heated without being wrinkled.

The recording paper 28 heated to 80 to 90 ° C. is conveyed on the recording paper conveying belt 22 which is sliding around the belt support 23 in synchronization with the recording paper conveying speed. The recording paper transport belt 22 has 3 to 5 holes of about 0.5 mmΦ.
The recording paper 28 is adsorbed on the recording paper conveying belt 22 by suction from the suction duct 25 of the belt support 23 in which the suction holes 24 are formed at a pitch of 4 mm in the vertical and horizontal directions and at substantially the same pitch. It is designed to be transported.
However, the surface of the belt support 23 is ± 10 so that the recording paper transport belt 22 is not strongly attracted to the belt support 23.
Roughness of about 0 μm is provided. In this way, the recording paper 28 which has been heated in advance is fixed on the recording paper conveyance belt 22 and conveyed immediately below the ink jet print head substrate 1 for printing. The ink adhered to the recording paper which has been heated to 80 to 90 ° C. in advance dries rapidly, and the water vapor thereof is exhausted from the suction nozzle 21 so as not to adhere to the inkjet print head substrate 1. In this embodiment, the recording paper conveyance speed is set to 150.
Although it is set to mm / S, the recording paper discharged to the left from the drive roller 26 in FIG. 7 can be handled normally because it is dried in 0.3 to 0.4 seconds after printing.

The feature of this embodiment is that a very compact heating device realizes rapid and safe heating.
Assuming a case where this is dried by heating after ink adhesion, it is necessary to adopt a method such as non-contact rapid heating, that is, infrared heating, but considering its size and safety, it is several times that of this embodiment. It is clear that

[0039]

According to the present invention, since the recording medium is pressed and heated from the recording surface side before recording on the recording medium, it is possible to speed up the drying of the ink after recording, and the ink jet printer It is possible to clear the important basic technology for realizing high-speed printing. In particular, by configuring the recording unit of the inkjet printer as described above, it is possible to make an inkjet printhead having a large number of ink ejection nozzles arranged in a high density and two-dimensionally. The slow printing speed, which was the only drawback of the inkjet printer by the technology, can be dramatically improved (10 to 100 times), and is used together with the above-mentioned means for speeding up the drying of the ink after recording by heating under pressure. As a result, high-speed printing can be realized. Moreover, the LSI that drives a large number of ink ejection nozzles is simplified to consist only of shift register circuits and driver circuits, and the total number of signal lines and power supply lines that control these is basically five. The head manufacturing cost can be significantly reduced. And these make it possible to relatively easily manufacture a line head, which was difficult to manufacture by the conventional technology, and realize continuous printing on recording paper during constant speed conveyance, facilitating control of recording paper conveyance and consumption. Achieves significant reduction in power consumption and uncontrolled head temperature.

[Brief description of drawings]

FIG. 1 is a top view of a print head of an inkjet printer which is an embodiment of the inkjet printer of the present invention.

FIG. 2 is a side view of the print head shown in FIG.

3 is a cross-sectional view taken along the line AA ′ shown in FIG.

4 is a cross-sectional view taken along the line BB ′ shown in FIG.

FIG. 5 is an enlarged view of a C portion shown in FIG.

6 is a cross-sectional view taken along line DD ′ shown in FIG.

FIG. 7 is a side view of an ink jet printer which is another embodiment of the ink jet printer of the present invention.

FIG. 8 is a sectional view showing a conventional heating resistor.

[Explanation of symbols]

1 is an ink jet head substrate, 2 is an orifice, 3 is a head mounting frame, 4 is a holding metal fitting, 5 is a set screw, 8
Is an ink groove in the mounting frame, 10 is an ink hole for connection, 1
Reference numeral 1 is a common ink groove, and 13 is an individual ink passage.

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B41J 2/01

Claims (5)

(57) [Claims] 1. A heater having a self-temperature control function is used as a heating source.
An ink jet recording method, comprising: heating a recording medium from the recording surface side with a heating device to heat the recording medium, and then ejecting ink droplets onto the recording medium for recording. 2. A conveying means for conveying a recording medium, a recording section for recording on the recording medium, and a heater arranged on the upstream side in the conveying direction of the recording section for heating a heater having a self-temperature control function.
MinamotoToshi pressurized which presses heating the recording medium from the recording surface side
An ink jet printer comprising: a thermal device . Wherein the heater, the ink jet printer according to claim 2 is a PTC heater. 4. The ink jet printer according to claim 2 , wherein the heating device is a belt type heater. 5. The recording section is provided on a Si substrate on which a driving integrated circuit is formed, a thin film heating resistor array connected to the driving integrated circuit, and the thin film heating resistor on the Si substrate. A common ink groove provided in the vicinity of the body row, a connecting ink hole that communicates the common ink groove with the back surface of the Si substrate, and a thin film heating resistor row provided on the front surface side of the Si substrate. Mounting having orifices corresponding to the heating resistors, individual ink passages that communicate the respective orifices with the common ink groove, and an ink supply passage that is mounted on the back side of the Si substrate and communicates with the ink holes for connection the ink jet printer according to any one of claims 2-4 and a frame.