JP2000218784A - Ink-jet recording head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink-jet recording head capable of achieving both light weight of a movable part of an ink-jet recording apparatus and low noise level in driving an ink pressure means. SOLUTION: An auxiliary wall 122 is provided at a 1 mm distance from the surface of an ink-jet recording head main body 11 inside a side wall 121 of an auxiliary plate 12a so as to be filled with a bonding seal member 13a having a 50 or less (JIS A) hardness to a position capable of covering a piezoelectric element 113 for air-tight joint of the recording head main body 11 and the auxiliary plate 12a. The surface of the recording head main body 11 is covered with the bonding seal member 13a so that noise generated by the drive of the piezoelectric element 113 can be absorbed. The auxiliary plate 12a is made from a plastic for achieving a light weight. Moreover, the noise level can further be lowered by interference of the generated noise with the noise reflected from the side wall.

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 technique in which ink is ejected as small droplets from nozzles and is recorded on a recording medium.

[0002]

2. Description of the Related Art The ink jet recording technique is one of the most frequently used printing methods at present because it can perform high-speed printing, has a high printing resolution, and can easily cope with colorization.

FIG. 3 shows an ink jet recording apparatus using an ink jet recording technique (hereinafter simply referred to as a recording apparatus).
FIG. 6 is a partial cross-sectional perspective view showing the configuration of a printing unit according to an embodiment of the present invention. FIG. 6 shows a holder 2 held by a carriage 3 and an ink jet recording head (hereinafter abbreviated as a recording head).
FIG. 4 is a cross-sectional view showing a detailed configuration of the recording head 1, and FIG. 5 is a plan view of a flow path substrate 111 of a recording head body 11 of the recording head 1. FIG.

The configuration shown in FIG. 3 is generally called a serial printing system, and the recording head 1 in FIG. 4 is called an on-demand type ink jet recording head. First, FIG. 4 and FIG.
This will be described with reference to FIG.

The recording head 1 has a recording head body 11 and an auxiliary plate 12 hermetically bonded by an adhesive sealing material 13. The recording head main body 11 includes an ink passage extending from the filter passage 1145 to the nozzle 1141 via the ink pressurizing chamber 1143.
A channel substrate 111 having a groove for forming an ink supply port 117, an ink supply port 117, and an ink reservoir 116, a vibration plate 112 bonded to a surface of the groove side, and a connection outside the ink pressurizing chamber 1143. And the piezoelectric element 113 thus formed.

[0006] The auxiliary plate 12 surrounds and protects the recording head main body 11 at the same time as surrounding the side surface portion of the recording head main body 11,
And a part that comes into contact with a suction and protection device described below,
It is made of a metal material such as cast iron, brass, stainless steel, or the like, and has a role of not radiating a vibration sound when the piezoelectric element 113 is driven to the outside, and has a relatively large dimension.
In particular, they are often made of cast iron because of their excellent vibration sound absorption, in other words, excellent damping characteristics.

As shown in FIG. 4, the auxiliary plate 12 and the recording head main body 11 are inserted into the opening formed in the center of the lower part of the auxiliary plate 12 so that the nozzle opening surface 115 side of the recording head main body 11 is inserted. The nozzle opening surface 115 is slightly recessed from the surface of FIG.

One example of a material used as the adhesive seal material 13 is as follows. Manufacturer: Toshiba Silicone Co., Ltd. Material: Silicone Product name: TSE3995 Curing reaction: Moisture in air Viscosity: 30P Hardness after curing: 18 (JIS A) Operating temperature range: -55 ° C to 200 ° C Recording head with such a configuration 1 is, as shown in FIG.
It is joined to the holder 2, receives ink from the holder 2, and is held on the carriage by the holder 2.
The holder 2 has a structure capable of supplying ink to the recording head main body 11 and holds the upper portion of the recording head main body 11.
, A holder B22 provided with a filter 24 for removing dust in the ink, and a holder C23 to which an ink tube 62 for supplying ink is connected. I have. As a material of the holder 2, a plastic such as polycarbonate is used.

When a pulse-like voltage is applied to the piezoelectric element 113 of the recording head 1 having the above configuration, the piezoelectric element 113
Is shrunk, the diaphragm 112 is displaced toward the ink pressurizing chamber 1143, and the volume of the ink pressurizing chamber 1143 is rapidly reduced.
Discharged from 41. The necessary recording is executed by controlling the ejection of the ink droplets.

As means for pressurizing the ink, in addition to the above-mentioned pressurizing method utilizing the volume change of the ink pressurizing chamber by the piezoelectric element, a heater is provided in the ink flow path, and a pulse current is passed through the heater. There is also a pressurizing unit that rapidly heats and vaporizes the ink. Next, the recording apparatus will be described with reference to FIG.

A carriage 3, on which a recording head 1 (not shown in FIG. 3) is mounted, is driven by a motor 51, a pulley 52, a belt 53 and the like along a guide rail 4 composed of two parallel axes. The recording medium 10 is fed by the carriage conveying means 5 in a direction perpendicular to the conveying direction of the recording medium 10 as a printing medium, and ink droplets ejected from the nozzles 116 of the recording head 1 during the recording execute line by line. The recording paper 10 is conveyed on the platen 7 by the rollers 8, and the recording of the entire recording paper is executed. Carriage 3 and recording paper
The transport of 10 and the ejection of ink droplets are controlled by a signal from a control unit (not shown).

The ink is supplied from the ink tank 61 to the recording head 1 via the holder 2 held by the carriage 3 through the ink tube 62. Suction and protection device
Reference numeral 91 denotes ink suction means for filling the ink in the ink tank 61 into the ink flow path of the recording head 1 and removing bubbles and dust remaining on the way.
It is also a protection means for preventing the ink near the opening surface of the nozzle 116 of the recording head 1 from drying when the recording apparatus is stopped, preventing dust from adhering around the nozzle 116, and protecting the recording head 1. When used as a suction means,
While the cap 911 is in close contact with the auxiliary plate 12 of the recording head 1, the cap 911 is moved by a pump (not shown).
The pressure inside is reduced, the ink is sucked from the nozzle 116, the ink is filled into the ink tube 62 and the ink flow path of the recording head 1, and bubbles and the like are removed. When used as a protection means, the auxiliary plate 12 of the recording head 1 is brought into close contact with the cap 911 to cover the nozzle opening surface of the recording head 1, but the pressure is not reduced. The wiper 92 is used for wiping and removing ink adhered to the nozzle opening surface of the recording head 1 and the lower surface of the auxiliary plate 12 around the nozzle opening surface after ink suction.

The suction of ink is performed when the recording apparatus is newly started up, when the ink tank 61 is replaced, when the number of printed sheets reaches a predetermined value, or when printing becomes defective. If air bubbles stay in the ink flow path of the recording head 1 or the like, the pressure for ejecting the ink droplets is absorbed by the air bubbles, and the ink droplets become smaller or no ink droplets are ejected. appear. In order to prevent such a problem beforehand, it is important to eliminate the retention of bubbles.

Such an ink suction operation is enabled by forming a closed space between the recording head 1 and the cap 911 of the suction and protection device 91. Therefore, it is important that the recording head main body 11 of the recording head 1 and the auxiliary plate 12 are joined in an airtight state by the adhesive sealing material 13. As an example of the adhesive sealing material 13 employed in the prior art, as described above, a product name TSE3995 manufactured by Toshiba Silicone Co., Ltd. is mentioned. This adhesive sealing material is a one-part silicone resin that is cured by moisture in the air, and has excellent sealing properties and ink resistance.

The joining method is performed by using the recording head body 11 and the auxiliary plate.
The adhesive sealing material 13 is supplied from the side opposite to the nozzle opening surface of the junction with the nozzle 12 and flows into the junction, where the high humidity (temperature: 25
(C, humidity: 70%) in an atmosphere furnace for 4 hours or more. The environment of this atmosphere furnace contains about twice as much moisture as that contained in normal air, but is not in an extremely humidified state. The reason why the humidified state is not extremely high is that when the joined recording head 1 is taken out of the atmosphere furnace, moisture adhering to the surface of the recording head main body 11 deteriorates the insulation state between the piezoelectric elements 113 and causes leakage between the electrodes. This is to prevent the occurrence of obstacles such as. In order to spread the adhesive sealing material 13 at the joint, the viscosity is 30P.
And

[0016]

The above prior art has the following problems. The driving sound emitted from the piezoelectric element 13 as the pressing means of the recording head 1 spreads spherically. The downward component is absorbed or blocked by the recording paper 10, the platen 7, other components, the case, and the like, and the upward component is absorbed or blocked by the holder 2, the carriage 3, and the like. However, the component directed to the side surface is blocked only by the side wall of the auxiliary plate 12.

In order to enhance the sound insulating effect of the auxiliary plate 12,
The conventional auxiliary plate 12 is made of cast iron or the like, and is relatively large and heavy. On the other hand, as a recording device,
It is required to reduce the weight of the movable section including the recording head 1 as much as possible, to reduce the size of the driving motor 51, and to improve the traveling characteristics of the movable section. In other words, the prior art is
It can be said that the weight of the movable part has been sacrificed in order to reduce the vibration noise when the piezoelectric element 113 as the pressing means is driven. An object of the present invention is to reduce the weight of the movable part of the recording apparatus and to reduce the level of vibration noise when the pressing means is driven.
It is an object of the present invention to provide a recording head satisfying the two problems.

[0018]

According to the present invention, there is provided a pressurizing means for pressurizing ink in a part of an ink flow path including a nozzle, and an ink droplet is ejected from the nozzle by driving the pressurizing means. In a recording head in which a recording head main body and an auxiliary plate for protecting the recording head main body from external impact and the like are joined by an adhesive sealant, the adhesive sealant has a hardness after curing of 50. The following (JI
The pressure-sensitive means and the surface of the recording head body in the vicinity thereof are covered with an adhesive seal material having a thickness of 1 mm or more (the invention of claim 1).

The pressure means for generating vibration during driving and the surface of the recording head main body in the vicinity thereof have a hardness of 50 or less and a thickness of 1 mm.
Since it is covered with the adhesive seal material of mm or more, the vibration from the pressurizing means is attenuated by the adhesive seal material, and the level of noise going out is reduced. In addition, since the rigidity of the adhesive sealing material is extremely low, even when the pressing means is deformed, the adhesive sealing material does not prevent the deformation.

Further, a recording head main body which has a pressurizing means for pressurizing ink in a part of an ink flow path including a nozzle, and which discharges ink droplets from the nozzle by driving the pressurizing means, comprises: In a recording head in which an auxiliary plate for protecting from external impacts and the like is joined by an adhesive seal material, the material of the auxiliary plate is plastic, and the pressing means and the recording head body in the vicinity thereof are formed of plastic. The distance between the front surface and the side wall of the auxiliary plate facing the front surface is [１ ／ ± 1/16] of the wavelength of the sound of the driving frequency at which the driving sound level of the piezoelectric element is maximized (the invention of claim 2).

The distance between the surface of the recording head body in the vicinity of the pressurizing means serving as a sound source and the side wall of the auxiliary plate facing the pressurizing means is 波長 of the wavelength of the driving frequency at which the vibration of the driving sound is maximized. Since the distance is set, the sound of that frequency is muted by interference between the sound of the source and the reflected sound from the side wall. In addition, in this case, even if the auxiliary plate is made of plastic, the effect can be sufficiently exhibited, so that the weight of the recording head can be significantly reduced.

Further, a recording head body which has a pressurizing means for pressurizing ink in a part of an ink flow path including a nozzle, and which discharges ink droplets from the nozzle by driving the pressurizing means, In a recording head in which an auxiliary plate for protecting against external impacts and the like is joined with an adhesive seal material, the adhesive seal material is a silicone resin having a hardness after curing of 50 or less (JIS A). Yes, the pressing means and the surface of the recording head body near the pressing means,
The auxiliary plate is made of plastic and covered with an adhesive seal material having a thickness of 1 mm or more. The driving sound level of the element is [１ ／ ± 1/16] of the wavelength of the sound at the driving frequency at which the element is at its maximum (the invention of claim 3).

In addition to the sound absorbing effect of the adhesive sealing material having a hardness of 50 or less and a thickness of 1 mm or more covering the surface of the recording head main body in the vicinity of the pressing means, the outer wall surface of the portion covering the pressing means etc. The noise level caused by the driving of the pressurizing means is further reduced by the sound deadening effect in which the distance to the side wall of the auxiliary plate is set to a distance of 1/4 of the wavelength of the sound of the driving frequency at which the driving sound level is maximized. Is made of plastic,
The weight of the recording head is greatly reduced.

[0024] In any one of the first to third aspects of the present invention, the pressurizing means is composed of a vibrating plate and a piezoelectric element joined to the surface thereof (the fourth aspect of the present invention). Since the pressurizing means uses the volume change of the ink pressurizing chamber due to the bending of the piezoelectric element and the diaphragm due to the deformation of the piezoelectric element as the pressurizing means, the pressurizing operation itself is the vibration operation. Therefore, the present invention which absorbs and silences the vibration sound from the vibration source and its vicinity or absorbs and silences the sound is particularly effective as a means for reducing the noise from the pressurizing means having this configuration.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a recording head according to the present invention will be described with reference to examples.

The parts having the same functions as those of the prior art are denoted by the same reference numerals.

[First Embodiment] FIG. 1 is a sectional view showing a structure of a first embodiment of a recording head according to the present invention.

The recording head 1a of this embodiment has a recording head body 11 similar to the prior art and an auxiliary wall made of plastic.
And an auxiliary plate 12a having an airtight seal member 13a made of silicone resin. Note that the adhesive sealing material 13a is filled not only in the adhesive sealing portion but also between the auxiliary wall 122 and the recording head main body 11, and covers the surface of the recording head main body 11 including the piezoelectric element 113.

The recording head main body 11 has an ink passage extending from the filter passage 1145 to the nozzle 1141 via the ink pressurizing chamber 1143.
A channel substrate 111 having a groove for forming an ink supply port 117, an ink supply port 117, and an ink reservoir 116, a vibration plate 112 bonded to a surface of the groove side, and a connection outside the ink pressurizing chamber 1143. And the piezoelectric element 113 thus formed. Auxiliary plate 12a
The piezoelectric element 11 of the recording head main body 11 is located inside the side wall 121.
Thickness 1.5 to enclose above position 3 with 1mm distance
It has an auxiliary wall 122 of mm.

The method of manufacturing the recording head 1a after the adhesive seal is as follows.

First, the recording head main body 11 is inserted into the insertion hole at the center of the auxiliary plate 12a so that the nozzle opening surface 115 of the recording head main body 11 does not project from the lower surface of the auxiliary plate 12a and faces downward. Positioning and setting, nozzle opening surface 11
From the side (upper side) opposite to 5, the adhesive sealing material 13a is supplied between the auxiliary wall 121 and the recording head main body 11 to at least the height covering the piezoelectric element 113. Then, in high humidity (temperature:
The adhesive sealing material 13a is cured in an atmosphere furnace at 25 ° C. and humidity: 70% for 4 hours or more. The environment of this atmosphere furnace contains about twice as much moisture as that contained in normal air, but is not in an extremely humidified state. The reason why the humidified state is not extreme is that when the joined recording head 1a is taken out of the atmosphere furnace, moisture adhering to the surface of the recording head body 11 deteriorates the insulation state between the piezoelectric elements 113 and causes leakage between the electrodes. This is to prevent the occurrence of obstacles such as. In order to spread the adhesive sealing material 13a at the joint, its viscosity is
30P.

As the above-mentioned moisture-curable silicone resin 13a, TSE3995, a product of Toshiba Silicone Co., Ltd., which is the same as the prior art, was employed. In selecting this resin, it is an examination item as an adhesive sealing material, 1)
Flowability of resin, 2) Influence of by-products, 3) Required properties such as sealability, 4) Curing speed, 5) Ink resistance, 6) Effect on ink, 7)
In addition to heat resistance, etc., 8) hardness after curing was also examined. The hardness after curing is an item directly related to the absorption of vibration from the vibration source, and in order to exhibit a sound absorbing effect with a thickness of 1 mm, the hardness must be 50 or less (JIS A).

The material of the auxiliary plate 12a includes water vapor permeability, water absorption, ink resistance, shape stability, adhesiveness, and the like for sufficiently curing the moisture-curable silicone resin 13a.
The following polyphenylene ether resin was adopted in consideration of cost and the like.

Manufacturer: Asahi Kasei Kogyo Co., Ltd. Material: Polyphenylene ether Product name: Zylon Grade: G020H Thermal deformation temperature: 220 ° C. The noise level of the recording device using the recording head 1 a of the above embodiment is 43 dBA, and the auxiliary wall 122 The noise level was significantly reduced compared to 49 dBA for the auxiliary plate not provided. The distance from the side wall of the auxiliary plate without the auxiliary wall to the recording head main body 11 is about 6 mm, and the width of the auxiliary plate is about
15 mm. This width is a width determined according to the size of the cap 911 of the suction / protection device 91 described in the section of “Prior Art”.

In addition, without providing the auxiliary wall 122 on the auxiliary plate,
Although the noise level can be reduced by filling the side walls with the adhesive sealing material, the amount of the adhesive sealing material to be filled increases, and the weight of the recording head increases.

In the above-described embodiment, a case has been described in which the surface of the recording head main body 11 is filled with a silicone resin having a hardness of 18 (JIS A) having a cured hardness of 1 mm as the adhesive sealing material 13a. However, the present invention is not limited to only those values, and when the hardness after curing is high, the same effect can be expected by increasing the thickness, and after curing, If the hardness is low, the same effect can be expected even if it is thin. It can be appropriately selected as long as the function as the adhesive sealing material can be maintained.

[Second Embodiment] FIG. 2 is a sectional view showing the structure of the second embodiment.

The recording head 1b of this embodiment has basically the same structure as the recording head 1 of the prior art,
The distance between the surface 113 of the recording head main body 11 on the opposite side of the piezoelectric element 113 and the side wall 121a of the auxiliary plate 12b opposed thereto (indicated by L in FIG. 2). ) Is set to 波長 of the wavelength of the sound at the drive frequency at which the drive sound level of the piezoelectric element is maximized.

Generally, when the recording head is driven at a driving frequency at which the driving sound level of the piezoelectric element 113 is maximized, the ink ejection characteristics are also maximized.

The sound generated when the piezoelectric element 113 of the recording head body 11 used in the embodiment is driven is converted into a fast Fourier transform (FF).
As a result of investigation using a T analyzer, it was found that the component at the frequency of 5 kHz was the maximum. L was determined so that the sound of the frequency of 5 kHz was most effectively silenced, and the auxiliary plate 12b was created. Specific numerical values will be described below.

The sound speed C in the air is given by C = 331 + 0.6 t (m / sec), where t is the temperature.

The operating temperature range of the recording head is 5 ° C. to 35 ° C.
Therefore, one of the wavelengths of the sound having a frequency of 5 kHz at 5 ° C.
/ 4 is 16.7 mm, and 1/4 of the wavelength of a sound having a frequency of 5 kHz at 35 ° C. is 17.6 mm.

Therefore, in this embodiment, L =
17.2 mm.

The noise level of the recording apparatus using the recording head 1b of this embodiment is 45 dBA, which is lower than that of the recording head 1 of the prior art (without the auxiliary wall in the description of the first embodiment). Was completed.

Even if L is not exactly ４ of the wavelength of the component of the driving frequency at which the driving sound level of the piezoelectric element is maximized, the component becomes small due to interference. If the value of L is within the range of 1/4 ± 1/16 of the wavelength, an effect of reducing the noise component at that frequency to half or less can be expected.

The frequency component of the sound generated by the recording head main body 11 at the frequency of 5 kHz is maximum due to the natural frequency of the recording head main body 11 including the configuration of the ink flow path and the materials and dimensions of the recording head main body. It is considered to be something to do. Therefore, if the configuration and dimensions of the recording head body change, it is necessary to review the value of L as a matter of course.

[Third Embodiment] In this embodiment, in addition to the sound absorbing structure of the adhesive sealing material in the first embodiment, the distance from the outer surface of the auxiliary wall to the side wall of the auxiliary plate has a high noise reduction effect.
It is 7.2 mm.

The noise level of the recording apparatus using the recording head of this embodiment was 40 dBA, and the noise absorption effect was superimposed on the sound absorption effect of the adhesive sealing material, so that the noise level could be minimized.

In the above three embodiments, the piezoelectric element
Although the description has been given of the case of the recording head main body 11 in which one side is joined to the recording head main body 11, it is needless to say that the present invention is completely effective in a recording head main body having ink flow paths on both sides of the flow path substrate. .

[0050]

According to the present invention, a part of the ink flow path including the nozzle has a pressurizing means for pressurizing the ink,
A recording head in which a recording head body that ejects ink droplets from nozzles by driving of a pressurizing unit, and an auxiliary plate that protects the recording head body from external impact are joined by an adhesive seal material. Wherein the adhesive sealing material is a silicone resin having a hardness of 50 or less (JIS A) after curing, and the pressure means and the surface of the recording head body in the vicinity thereof are covered with an adhesive sealing material having a thickness of 1 mm or more. Therefore, the vibration from the pressurizing means is attenuated by the adhesive sealing material, and the level of noise going out is reduced. In addition, since the rigidity of the adhesive sealing material is extremely low, even when the pressing means is deformed, the adhesive sealing material does not prevent the deformation. Further, since the vibration from the pressurizing means is attenuated by the adhesive sealing material, it is possible to replace the auxiliary plate from a heavy and large one made of cast iron or the like having good vibration absorbency to a small and light one. Therefore, it is possible to provide a recording head capable of reducing the weight of the movable portion of the recording apparatus and reducing the vibration noise when the pressing means is driven (the invention of claim 1).

Further, a recording head main body which has a pressurizing means for pressurizing ink in a part of an ink flow path including a nozzle, and which discharges ink droplets from the nozzle by driving the pressurizing means, In a recording head in which an auxiliary plate for protecting from external impacts and the like is joined by an adhesive seal material, the material of the auxiliary plate is plastic, and the pressing means and the recording head body in the vicinity thereof are formed of plastic. The distance between the front surface and the side wall of the auxiliary plate facing the front surface is [１ ／ ± 1/16] of the wavelength of the sound at the driving frequency at which the driving sound level of the piezoelectric element is maximized.

The distance between the surface of the recording head main body in the vicinity of the pressurizing means serving as a sound source and the side wall of the auxiliary plate facing the pressurizing means is １ ／ of the wavelength of the sound at the driving frequency at which the vibration of the driving sound is maximized. Since the distance is set, the sound of that frequency is muted by interference between the sound of the source and the reflected sound from the side wall. In addition, in this case, even if the auxiliary plate is made of plastic, the effect can be sufficiently exhibited, so that the weight of the recording head can be significantly reduced. Therefore, it is possible to provide a recording head capable of reducing the weight of the movable portion of the recording apparatus and reducing the vibration sound when driving the piezoelectric element (the invention of claim 2).

Further, a recording head body which has a pressurizing means for pressurizing ink in a part of an ink flow path including a nozzle, and which discharges ink droplets from the nozzles by driving the pressurizing means, comprises: In a recording head in which an auxiliary plate for protecting against external impacts and the like is joined with an adhesive seal material, the adhesive seal material is a silicone resin having a hardness after curing of 50 or less (JIS A). Yes, the pressing means and the surface of the recording head body near the pressing means,
The auxiliary plate is made of plastic and covered with an adhesive seal material having a thickness of 1 mm or more. This is [１ ／ ± 1/16] of the wavelength of the sound at the drive frequency at which the drive sound level of the element is maximized.

In addition to the sound-absorbing effect of the adhesive sealing material having a hardness of 50 or less and a thickness of 1 mm or more covering the surface of the recording head main body in the vicinity of the pressing means, the outer wall surface of the portion covering the pressure means and the like is The noise level caused by the driving of the pressurizing means is further reduced by the sound deadening effect in which the distance to the side wall of the auxiliary plate is set to a distance of 1/4 of the wavelength of the sound of the driving frequency at which the driving sound level is maximized. Is made of plastic,
The weight of the recording head is greatly reduced. Therefore, it is possible to provide a recording head capable of reducing the weight of the movable portion of the recording apparatus and lowering the vibration sound when the piezoelectric element is driven (the invention of claim 3).

In any one of the first to third aspects of the present invention, the pressurizing means comprises a diaphragm and a piezoelectric element joined to the surface of the diaphragm. Since the pressurizing means uses the volume change of the ink pressurizing chamber due to the bending of the piezoelectric element and the diaphragm due to the deformation of the piezoelectric element as the pressurizing means, the pressurizing operation itself is the vibration operation. Therefore, the present invention which absorbs and silences the vibration noise from the vibration source and its vicinity or absorbs and silences the noise is particularly effective as a means for reducing the noise from the pressurizing means having this configuration (the invention of claim 4).

[Brief description of the drawings]

FIG. 1 is a sectional view showing the configuration of a first embodiment of a recording head according to the present invention;

FIG. 2 is a sectional view showing a configuration of a second embodiment.

FIG. 3 is a partial cross-sectional perspective view showing a configuration of a recording apparatus.

FIG. 4 is a partial cross-sectional perspective view showing a configuration of a recording head.

FIG. 5 is a plan view showing a channel groove of an example of the channel substrate.

FIG. 6 is a sectional view showing an example of a configuration of a holder and a recording head.

[Explanation of symbols]

 1, 1a, 1b recording head 11 recording head main body 111 flow path substrate 112 diaphragm 113 piezoelectric element 114 ink flow path 1141 nozzle 1142 nozzle flow path 1143 ink pressurizing chamber 1144 ink supply path 1145 filter flow path 115 nozzle opening surface 116 ink Reservoir 117 Ink supply port 12, 12a, 12b Auxiliary plate 121, 121a Side wall 122 Auxiliary wall 13, 13a Adhesive sealing material 3 Carriage 4 Guide rail 5 Carriage transport means 51 Motor 52 Pulley 53 Belt 6 Ink supply means 61 Ink tank 62 Ink tube 7 Platen 8 Roller 9 Failure factor removal and protection means 91 Suction and protection device 911 Cap 92 Wiper 10 Recording paper

Claims (4)

[Claims] An ink jet recording head body having a pressurizing means for pressurizing ink in a part of an ink flow path including a nozzle, and ejecting ink droplets from the nozzle by driving the pressurizing means; In an ink jet recording head constituted by bonding an auxiliary plate for protecting the main body from an external impact with an adhesive seal material, the adhesive seal material has a hardness after curing of 50 or less (JIS A).
An ink jet recording head, characterized in that the surface of the ink jet recording head body in the vicinity of the pressure means and the pressure means is covered with an adhesive sealing material having a thickness of 1 mm or more. 2. An ink jet recording head body having a pressurizing means for pressurizing ink in a part of an ink flow path including a nozzle, and ejecting ink droplets from the nozzle by driving the pressurizing means. In an ink jet recording head constituted by bonding an auxiliary plate for protecting the main body from external impact and the like with an adhesive sealing material, the material of the auxiliary plate is plastic, and the pressurizing means and the ink jet in the vicinity thereof The distance between the surface of the recording head body and the side wall of the auxiliary plate opposed thereto is [ヘ ッ ド ± 1/16] of the wavelength of the sound at the driving frequency at which the driving sound level of the piezoelectric element is maximized. Inkjet recording head. 3. An ink jet recording head body having a pressurizing means for pressurizing ink in a part of an ink flow path including a nozzle, and ejecting ink droplets from the nozzles by driving the pressurizing means. In an ink jet recording head constituted by bonding an auxiliary plate for protecting the main body from an external impact with an adhesive seal material, the adhesive seal material has a hardness after curing of 50 or less (JIS A).
The pressurizing means and the surface of the ink jet recording head body in the vicinity of the pressurizing means are covered with an adhesive sealing material having a thickness of 1 mm or more. The material of the auxiliary plate is plastic, and the pressurizing means is covered. The distance between the outer surface of the portion where the vibration occurs and the side wall of the auxiliary plate facing the outer surface is [１ ／ ± 1/1] of the wavelength of the sound at the driving frequency at which the driving sound level of the piezoelectric element is maximized
6]. 4. The apparatus according to claim 1, wherein said pressurizing means comprises a vibrating plate and a piezoelectric element joined to a surface of said vibrating plate.
The inkjet recording head according to any one of claims 1 to 3.