JP2001150674A - Ink-jet recording apparatus and its nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nozzle of an ink-jet recording apparatus which can efficiently and stably oscillate ink in an ink chamber by the vibration in an axis direction of a piezoelectric body. SOLUTION: An oscillating part for applying vibration to the ink 16 in the ink chamber 27 and jetting the ink 16 out from an orifice 28 is constituted of the piezoelectric body 31 of a cylindrical shape for generating the vibration and a diaphragm 30 set to an end part in the axis direction of the piezoelectric body 31 for transmitting the generated vibration to the ink 16 in the ink chamber 27.

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 apparatus and its nozzle.

[0002]

2. Description of the Related Art In general, a nozzle of a continuous ink jet recording apparatus which performs printing by constantly ejecting ink to generate ink particles is provided with a predetermined amount of ejected ink as described in Japanese Patent Application Laid-Open No. Hei 5-212,862. By applying the vibration of the above with a piezoelectric material, the ink is turned into particles. The vibration of the piezoelectric body is set to be amplified by using the fluid resonance and the mechanical resonance of the ink.

[0003]

The above prior art nozzle has an orifice plate having an orifice attached thereto, and a circular concave portion on the end face of the main body. And vibrates the ink in the ink chamber. The ring-shaped piezoelectric body can vibrate in the axial direction when a voltage is applied.

However, the above-mentioned ring-shaped piezoelectric body generates not only the axial vibration but also the radial vibration, so that the ink particles are not stabilized and it is necessary to remove the radial vibration. Further, since the piezoelectric body and the ink are in contact with each other, the piezoelectricity of the piezoelectric body is deteriorated, so that there is a problem that a desired vibration displacement cannot be obtained.

SUMMARY OF THE INVENTION An object of the present invention is to provide an ink jet recording apparatus capable of efficiently and stably vibrating ink in an ink chamber by axial vibration of a piezoelectric body, and a nozzle thereof.

[0006]

In order to achieve the above object, a feature of the nozzle of the ink jet recording apparatus according to the present invention is that a vibration is applied to the ink in the ink chamber so as to vibrate the ink and eject the ink from the orifice. Department
The object is to constitute a cylindrical piezoelectric body that generates vibration, and a vibration member that is attached to an axial end of the piezoelectric body and transmits the generated vibration to the ink in the ink chamber.

More specifically, the present invention provides the following nozzles and devices. The present invention is directed to a nozzle of an ink jet recording apparatus comprising: a vibrating unit that vibrates ink in an ink chamber to eject the ink from an orifice; and a holding member that holds the vibrating unit. Is
A piezoelectric member having a cylindrical shape for generating the vibration, and a vibration member attached to an axial end of the piezoelectric member for transmitting the generated vibration to ink in the ink chamber. Provided is a nozzle of an ink jet recording apparatus.

Preferably, an inner electrode and an outer electrode are independently formed on an inner peripheral surface and an outer peripheral surface of the piezoelectric body, and an electric field non-formed portion is formed in which the outer electrode does not face the inner electrode. Then, the vibrating member is bonded and fixed at the electric field non-formed portion.

Preferably, the vibration member is a diaphragm whose outer peripheral portion is held by the holding member.

[0010] Preferably, a flow path of the ink to be supplied to the ink chamber is provided so as to pass through the center of the diaphragm through the inside of the cylinder of the piezoelectric body.

Preferably, the vibration member is a piston fitted to a cylinder provided on the holding member.

Preferably, the vibrating portion includes an orifice plate having the orifice, a cylindrical piezoelectric member attached to the orifice plate and generating the vibration, and the ink provided inside the orifice plate. A flow path for supplying the ink to the chamber; and the orifice plate gives a vibration generated by the piezoelectric body to the ink in the ink chamber.

Further, according to the present invention, there is provided a nozzle for applying a vibration of a piezoelectric body to ink in an ink chamber, ejecting ink from an orifice to generate ink particles, and charging the ink particles in accordance with a predetermined recording signal. 7. An ink jet recording apparatus comprising: a deflection control means for performing printing on a recording medium by deflecting the recording medium, wherein the nozzle is a nozzle of the ink jet recording apparatus according to any one of claims 1 to 6. The present invention provides an ink jet recording apparatus characterized by the following.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an ink jet recording apparatus and nozzles according to an embodiment of the present invention will be described with reference to the drawings.

First, a schematic configuration of an ink jet recording apparatus according to an embodiment of the present invention will be described with reference to FIG.

The ink supply path 21 includes an ink container 1 for storing the ink 16, a supply pump 2 for feeding the ink 16, a pressure regulating valve 3 for adjusting the ink pressure, and an electromagnetic valve 4 for opening and closing the ink flow path. And the filter 5, and supplies the ink 16 to the nozzle 6.

The nozzle 6 is connected to an excitation source (not shown).
Occurs regularly. In the present embodiment, 68 [kHz]
Drive with

A recording signal source (not shown) is connected to the charging electrode 7.
Is connected, and by applying a recording signal voltage to the charging electrode 7, the ink particles 8 ejected regularly from the nozzles 6 are charged.

A high voltage source (not shown) is applied to the upper deflection electrode 9.
Is applied, and the lower deflection electrode 10 is grounded. For this reason, an electrostatic field is formed between the upper deflection electrode 9 and the lower deflection electrode 10, and the charged ink particles 8 are deflected according to the amount of charge, and printing is performed.

The ink recovery path 22 includes the backlash 11, the filter 12, and the recovery pump 14, and the charging electrode 7
The ink particles 8 which are not charged and are not involved in the recording are collected, and the ink 16 is returned to the ink container 1 for reuse.

The ink circulation path 23 is an ink flow path from the nozzle 6 to the ink recovery path 22 via the electromagnetic valve 15, and returns the ink 16 in the nozzle 6 to the ink container 1.

Next, a nozzle according to the first embodiment of the present invention and used in the ink jet recording apparatus of FIG. 13 will be described with reference to FIG.

The nozzle 6 includes a body 25 and the body 2
An orifice plate 29 attached to the distal end of the body 5 and a base 38 attached to the base end of the body 25 constitute a housing.

The ink supply path 21 is provided in the body 25 and the orifice plate 29, and supplies the pressurized ink 16 through a joint 43 connected to the body 25. Then, the ink 16 is guided to an ink chamber 27 provided in the orifice plate 29, and is ejected from an orifice 28 in the orifice plate 29.

The orifice plate 29 is screwed to the body 25 and can be removed. Therefore, the seal between the orifice plate 29 and the body 25 is O
The ring 32, 33 is used.

The vibrating section for vibrating the ink 16 in the ink chamber 27 includes a piezoelectric body 31 and a diaphragm 30.
And a counter weight 26, which is held by a body 25 as a holding member.

The piezoelectric body 31 has one end bonded to the diaphragm 30 and the other end bonded to the counter weight 26. The piezoelectric body 31 is preferably light in order to increase the higher-order resonance frequency of the vibrating section, and thinner in order to increase the displacement efficiency. Further, in order to increase the adhesive strength, it is necessary to make the shape such that the adhesive area can be widened. Therefore, the piezoelectric body 31 has a cylindrical shape. High rigidity due to cylindrical shape.

Electrodes are provided on the inner and outer surfaces of the piezoelectric body 31, as shown in FIG. The electrode 51 on the inner surface is provided on the entire inner surface and the end surface 53 of the cylindrical portion. The outer electrodes 52 have a distance of 0.5 mm in order to maintain electrical insulation between the outer electrodes 52.

The diaphragm 30 has a disk shape and has a body 2
5 and the collar 24 are fixed by sandwiching the outer peripheral portion of the diaphragm 30. The collar 24 has a cylindrical shape and is held by a base 38. Diaphragm 30
The body 25 and the orifice plate 29 form an ink chamber 27 so that the piezoelectric body 31 and the ink 16 do not come into contact with each other.

A piezoelectric body 31 is provided at the center of the diaphragm 30.
There is a convex portion 30c for fixing. The protrusion 30c is fitted inside the cylinder of the piezoelectric body 31, and the piezoelectric body 31 is bonded by the protrusion 30c of the diaphragm 30. The bonding portion is the end portion 53 of the piezoelectric body 31 shown in FIG. 11 and the inner surface side of the electric field non-forming portion 54 where no electric field is applied to the piezoelectric body 31, and it is preferable to use an epoxy-based bonding agent. Further, a conductive adhesive such as a silver paste may be used.

This is because the electric field non-formed portion 5 to which no electric field is applied is provided.
In No. 4, since no displacement occurs, the distortion stress generated by the distortion of the piezoelectric body 31 at the bonding portion is reduced, and the reliability of the axial vibration of the piezoelectric body 31 is improved.

Since the vibration transmitted to the ink 16 is due to the bending displacement of the diaphragm 30, only the vibration of the piezoelectric body 31 in the axial direction is generated. Further, since the ink vibration area is increased by the diaphragm 30, the vibration can be efficiently transmitted to the ink.

From the viewpoint of rigidity and vibration isolation, the diaphragm 3
The thickness of 0 may be about 0.5 mm or less, and is set to 0.5 mm in the present embodiment. As a result, the lower-order resonance frequency of the vibrator is about 30 [kHz], and the driving frequency is 68 [kHz].
z], the vibration at the drive frequency can be stabilized.

The counter weight 26 is adhered and fixed to one end of the piezoelectric body 31, and the weight of the counter weight 26 can particularly adjust the higher-order resonance frequency of the vibrating section. When the higher-order resonance frequency is set higher, the counter weight 26 may not be provided. In the present embodiment, the counter weight 26
Is 0.1 [g] and the higher-order resonance frequency is 100 [kHz]
When there is no counter weight, 120 [kH
z]. The bonding between the counterweight 26 and the piezoelectric body 31 is performed in the same manner as described above.
This is performed on the inner surface side of the electric field non-formed portion 54 where no electric field is applied.

The connection between the piezoelectric body 31 and an excitation source (not shown) is made by a lead wire (not shown). Internal electrode 51
The counter weight 26 has a cylindrical shape in order to connect the lead wire and the lead wire. As another method, the internal electrode 51
Since the diaphragm 30 and the counter weight 26 are in contact with each other, the lead wire on the internal electrode side may be connected to the diaphragm 30 and the counter weight 26. As shown in FIG. 12, if the inner electrode 51 is folded back to the outer surface, the connection between the inner electrode 51 and the lead wire can be performed on the outer electrode 52 side.

Next, a method for removing air and foreign matter in the ink chamber 27 in the ink circulation path 23 to stabilize the ejection of the ink 16 will be described. First, the ink supply and circulation control circuit will be described with reference to FIG.

The CPU 300 is a central processing unit that controls the supply and circulation of ink according to the present embodiment. R
The OM 320 is a read-only memory that stores programs and control data necessary for the operation of the CPU 300. The RAM 310 stores the CPU 3 during the execution of the program.
00 is a rewritable memory that temporarily stores data and the like handled by 00.

The bus line 400 is a signal line including all data, address signals, and control signals from the CPU 300. The interface circuit 330 mediates input and output of data, address signals, control signals, and the like.

The pump control circuit 350 controls driving of the supply pump 2 and the recovery pump 14 based on a command from the CPU 300.

The valve control circuit 340 controls the opening and closing of the solenoid valves 4 and 15 based on a command from the CPU 300.

The clock generator 390 and the frequency divider 380,
The counter circuit 370 and the latch circuit 360 constitute a timer. Dividing circuit 380 divides the signal output from clock generator 390. The counter circuit 370 is
The signal divided by the frequency dividing circuit 380 is counted. The counter circuit 370 can be reset by a command from the CPU 300, and the frequency division ratio of the frequency dividing circuit 380 can be changed by a command from the CPU 300.

13 is an excitation source, 16 is a recording signal source, 410
Is an input device.

Next, the ink circulation control will be described with reference to FIG.

When receiving an instruction to start the apparatus from the input apparatus 410, the CPU 300 performs the processing of step 100.
First, the recovery pump 14 and the supply pump 2 are started (Step 100), and the solenoid valves 4 and 15 are opened (Step 11).
0), ink is supplied from the ink supply path 21 to the nozzles 6; Since the solenoid valve 15 is open, ink does not jet from the nozzle 6 and is collected in the ink container 1 through the ink collection path 23.

Next, the timer for setting the ink circulation time is started after resetting (step 120), and when the timer reaches the set value (step 130), the processing shifts to step 140 and the electromagnetic valve 15 is closed. (Step 140). Therefore, the ink 16 in the ink chamber 27
Is pressurized, and the ink 16 is ejected from the orifice 28.

An excitation voltage is output from the excitation source 13 and applied to the piezoelectric body 31 (step 150). The piezoelectric body 31 to which the excitation voltage is applied expands and contracts, and its axial vibration is
By vibrating the diaphragm 30, the ink 16 in the ink chamber 27 is vibrated, and the ink 16 ejected from the orifice 28 is regularly formed into particles. Thereby, the ink particles 8
Becomes a printable state, and the apparatus startup processing ends.

By performing the ink circulation as described above,
Air and foreign matters in the ink chamber 27, the ink supply path 21, and the ink circulation path 23 can be removed, and ink can be ejected stably.

FIG. 2 shows a configuration of a nozzle according to a second embodiment of the present invention. The feature of the nozzle 6 is a thin flange structure in which a connecting portion 30a and a piezoelectric support portion 30b are formed on the diaphragm 30 and fixed to the body 25 at an outer peripheral portion of the diaphragm 30.

The diaphragm 30 and the piezoelectric support 30b are connected via a connection 30a. Connection part 30
The outer diameter of b is smaller than the outer diameters of the diaphragm 30 and the piezoelectric support 30b. The piezoelectric support 30b has a protrusion 30c, and the piezoelectric body 31 is bonded to the piezoelectric support 30b by the protrusion 30c. As in the first embodiment, the bonding portion is on the inner surface side of the end 53 of the piezoelectric body 31 and the electric field non-formed portion 54 of the piezoelectric body 31.

A counter weight 26 is adhered to the other end of the piezoelectric body 31. By changing the weight of the counterweight 26, the higher-order resonance frequency of the vibration unit can be adjusted. However, when the resonance frequency is set to be high, the counterweight 26 may not be provided. By adopting a thin collar structure,
Since the rigidity of the diaphragm 30 can be reduced, the lower-order resonance frequency of the vibrating section is about 10 [kHz], and the higher-order resonance frequency is the same as in the first embodiment, which is sufficiently far from the drive frequency 68 [kHz]. , The vibration is stable.

FIG. 3 shows the configuration of a nozzle according to a third embodiment of the present invention. The difference from the first embodiment is that the flow path configuration of the ink 16 is changed. A joint 43 is formed integrally with the diaphragm 30, and an ink supply path 21 that communicates with the ink chamber 27 through the center of the diaphragm 30 is provided. The ink supply path 21 is not in contact with the piezoelectric body 31 and the counterweight 26, and the piezoelectric body 31 is bonded to the diaphragm 30. Since the ink supply flow path 21 is provided in the center of the diaphragm 30, the size of the nozzle can be reduced.

FIG. 4 shows a configuration of a nozzle according to a fourth embodiment of the present invention. The nozzle 6 has a different flow path configuration of the nozzle of the third embodiment, and is an example in which the ink supply path 21 is separated into a vibration part side 21a and a joint side 21b. The ink supply path 21a connected to the diaphragm 30 is supported by an O-ring 47 provided on the spacer 35, and the ink supply path 21b provided on the base 38.
Is connected to

On the base 38, a joint 43 and an O-ring 4
8 are provided. The pacer 35 is sandwiched between the base 38 provided with the joint 43 and the body 25. Further, as in this embodiment, the diaphragm 30 may be supported by the body 25 and the orifice plate 29.
The O-ring 34 is fitted in a groove provided in the orifice plate 29. With such a configuration, the piezoelectric body 31
Can be transmitted to the ink in the ink chamber 27 via the diaphragm 30 without being affected by the joint 43.

FIG. 5 shows a configuration of a nozzle according to a fifth embodiment of the present invention. In the nozzle 6, the vibrating portion of the nozzle of the third embodiment has the thin flange structure of the second embodiment. Thereby, the vibration of the vibration unit can be further stabilized.

FIG. 6 shows a configuration of a nozzle according to a sixth embodiment of the present invention. The nozzle 6 is an example in which an ink circulation path 23 is provided in the nozzle of the third embodiment. The ink circulation path 23 is provided in the body 25 and the orifice plate 29 so as not to interfere with the diaphragm 30. At the joint between the body 25 and the orifice plate 29, an O-ring 33 is provided on the body 25 side for sealing. The circulation method may be the same as in the first embodiment.

Thus, the ink 16 can be circulated to remove bubbles, foreign matter, and the like in the ink chamber 27, and stable ink ejection can be performed. However, the ink 16 may be supplied to the ink chamber 27 from the ink circulation path 23 and the ink may be collected from the ink supply path 21.

FIG. 7 shows a configuration of a nozzle according to a seventh embodiment of the present invention. In the nozzle 6, the vibrating portion of the nozzle of the sixth embodiment has the thin flange structure of the second embodiment. Thereby, the vibration of the vibration unit can be further stabilized.

FIG. 8 shows a configuration of a nozzle according to an eighth embodiment of the present invention. The nozzle 6 is characterized in that the vibrating portion is constituted by a piston 37, an O-ring 36, a piezoelectric body 31, and a base 38. The piston 37 is bonded to the piezoelectric body 31 and applies vibration of the piezoelectric body 31 to the ink 16.

The piston 37 has a cylindrical shape, and is provided with a groove for receiving the O-ring 26 on the side surface. The O-ring 26 is made of EPDM and has a wire diameter of 0.8 mm, and is fitted in a groove provided in the piston 37. The piston 37 fitted with the O-ring 26 is fitted in a cylindrical cylinder provided in the body 25, and has a sealing structure such that ink in the ink chamber 27 does not enter the piezoelectric body 31 side. A groove for fixing the O-ring 26 may be provided on the body 25 side.

The other end of the piezoelectric body 31 is bonded to the base 38. The base 38 has a flange portion 38 a that protrudes to the periphery in a flange shape.
The vibrating portion is fixed by holding the vibrating portion 8a.

The piston 37 has a convex portion 37a at the center for fixing the piezoelectric body 31 thereto. The protrusion 37a is fitted inside the cylinder of the piezoelectric body 31, and the piezoelectric body 31 is
7 are bonded by the convex portion 37a. The bonding portion is on the inner surface side of the end portion 53 of the piezoelectric body 31 and the electric field non-formed portion 54 on the piezoelectric body 31. This is because the electric field non-formed portion 54 to which no electric field is applied is formed.
In this case, no displacement occurs, so that the strain stress generated by the deformation of the piezoelectric body 31 at the bonding portion can be reduced.

In the same manner as described above, the base 38 and the piezoelectric body 31 are adhered to each other by a convex portion 38b on the base 38 side and an electric field in which no electric field is applied to the end portion 53 of the piezoelectric body 31 and the piezoelectric body 31 on the piezoelectric body 31 side. This is performed on the inner surface side of the portion 54.

The connection between the piezoelectric body 31 and the excitation source 13 is made by a lead wire. Since the internal electrode 51 is in contact with the diaphragm 30 and the base 38, a lead wire on the internal electrode side may be connected to the diaphragm 30 and the cow base 38. As shown in FIG. 12, if the inner electrode 51 is folded back to the outer surface, the connection between the inner electrode 51 and the lead wire can be performed on the outer electrode 52 side.

With such a configuration, the vibration displacement of the piezoelectric body 31 can be efficiently transmitted to the ink 16 via the piston 37.

FIG. 9 shows a configuration of a nozzle according to a ninth embodiment of the present invention. The base 38 is connected to the piezoelectric support 38
c, a connecting portion 38d, and a flange portion 38a.
The rigidity of the flange portion 38a is reduced by being connected to the flange portion 38a by a connecting portion 38d having an outer diameter smaller than that of the piezoelectric body supporting portion 38c, and a gap 46 is provided so that the flange portion 38c does not interfere with the base retainer 39. .

Thus, as in the second embodiment, the body 25 and the base holder 39 can be insulated from the vibration, so that the vibration of the vibrating section can be stabilized. From the viewpoints of rigidity and vibration insulation, the thickness of the diaphragm 30 may be about 0.5 mm or less as described above.

FIG. 10 shows a configuration of a nozzle according to a second embodiment of the present invention. A vibrating section that vibrates the ink in the ink chamber 27 includes a piezoelectric body 31, an orifice plate 29, and a counterweight 26.
The piezoelectric body 31 has a cylindrical shape, and has one end fixed to the orifice plate 29 and the other end fixed to the counter weight 26.

By changing the weight of the counter weight 26, the resonance frequency of the vibrating section can be adjusted. However, when the resonance frequency is set to be high, the counter weight 26 may be omitted.

As shown in FIG. 11, the piezoelectric body 31 is provided with electrodes on the inner and outer surfaces. The electrode 51 on the inner surface side is provided on the entire inner surface and the end surface 53 of the cylindrical portion. The outer electrode 52 has an interval of 0.5 mm to maintain electrical insulation between the outer electrode 52 and the inner electrode 51.

The orifice plate 29 has a disk shape.
A convex portion 42 for fixing the piezoelectric body 31 is provided at the center thereof.
And a housing 41 that supports the pipe 44. The protrusion 42 is fitted inside the cylinder of the piezoelectric body 31 and the piezoelectric body 3
1 is bonded by a convex portion 42. The bonding portion is on the inner surface side of the end portion 53 of the piezoelectric body 31 and the electric field non-formed portion 54 where no electric field is applied to the piezoelectric body 31. Also, the counter weight 26
Similarly to the above, the bonding between the piezoelectric body 31 and the piezoelectric body 31 is performed at the end 53 of the piezoelectric body 31 and the inner surface of the electric field non-formed portion 54 where no electric field is applied to the piezoelectric body 31.

The connection between the piezoelectric body 31 and the excitation source 13 is made by a lead wire. Since the internal electrode 51 is in contact with the orifice plate 29 and the counter weight 26, a lead wire on the internal electrode side may be connected to the orifice plate 29 and the counter weight 26. Further, as shown in FIG. 12, if the inner electrode 51 is folded back to the outer surface, the connection between the inner electrode 51 and the lead wire is made to the outer electrode 5.
Can be done on two sides.

The ink supply path 21 is provided in a pipe 44, and a joint 43 is provided at one end thereof. The pipe 44 has a groove into which the O-ring 36 fits, and the O-ring 36 is fitted therein. The ink supply path 21 in the pipe 44 is straight from the joint, and bends at a right angle beyond the O-ring 36 to form the flow path 40.

The ink 16 flows from the flow path 40 into the ink chamber 27 formed by the housing 41 of the orifice plate 29, one end 45 of the pipe, and the O-ring 36 provided on the joint 43. Then, the ink 16 is ejected from the orifice 28 in the orifice plate 29.

The outer peripheral portion of the orifice plate 29 is fixed to the body 25, and the central portion of the orifice plate 29 vibrates in the axial direction.

[0075]

According to the present invention, the ink in the ink chamber can be efficiently and stably vibrated by the vibration of the piezoelectric body in the axial direction, so that the ink ejected from the orifice can be stably formed into particles. The reliability of the nozzle can be improved.

Further, since the lower and higher resonance frequencies of the vibrating section are sufficiently separated from the driving frequency, stable vibration can be obtained.

Further, the generation of strain stress acting on the bonding portion of the piezoelectric body is suppressed, and stable vibration can be maintained for a long time since the piezoelectric body does not contact the ink.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a nozzle according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a nozzle according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a nozzle according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram of a nozzle according to a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram of a nozzle according to a fifth embodiment of the present invention.

FIG. 6 is a configuration diagram of a nozzle according to a sixth embodiment of the present invention.

FIG. 7 is a configuration diagram of a nozzle according to a seventh embodiment of the present invention.

FIG. 8 is a configuration diagram of a nozzle according to an eighth embodiment of the present invention.

FIG. 9 is a configuration diagram of a nozzle according to a ninth embodiment of the present invention.

FIG. 10 is a configuration diagram of a nozzle according to a tenth embodiment of the present invention.

FIG. 11 is a diagram showing an electrode configuration of a piezoelectric body.

FIG. 12 is a diagram showing another electrode configuration of the piezoelectric body.

FIG. 13 is a schematic configuration diagram of an inkjet recording apparatus according to an embodiment of the present invention.

14 is a configuration diagram of an ink supply circulation control circuit of the ink jet recording apparatus of FIG.

FIG. 15 is a flowchart of an ink circulation control operation of the ink jet recording apparatus of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Ink container, 2 ... Supply pump, 6 ... Nozzle, 7 ... Charge electrode, 8 ... Ink particle, 9 ... Top deflection electrode, 11 ... Gutter, 16 ... Ink, 26 ... Counter weight, 27 ...
Ink chamber, 28 orifice, 29 orifice plate, 30 diaphragm, 31 piezoelectric body, 37
piston

 ──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Seiji Fujikura 1-1-1, Higashitaga-cho, Hitachi City, Ibaraki Prefecture Inside Hitachi Taga Electronics Co., Ltd. (72) Inventor Yoshifumi Honma 1-1-1, Higashitaga-cho, Hitachi City, Ibaraki Prefecture No. 1 Hitachi Taga Electronics Co., Ltd. (72) Inventor Akira Miyao 1-1-1, Higashitagacho, Hitachi City, Ibaraki Prefecture F-term (reference) 2C057 AF23 AF93 AG44 AG92 AG93 AP02 AP25 BA03 BA07 BA14

Claims (7)

[Claims] (1) vibrating ink in an ink chamber;
A vibrating unit that ejects the ink from an orifice, and a nozzle of an ink jet recording apparatus including a holding member that holds the vibrating unit, wherein the vibrating unit has a cylindrical piezoelectric body that generates the vibration; A vibrating member attached to an axial end of the piezoelectric body for transmitting the generated vibration to ink in the ink chamber. 2. The electric field device according to claim 1, wherein an inner electrode and an outer electrode are independently formed on an inner peripheral surface and an outer peripheral surface of the piezoelectric body, and the outer electrode does not face the inner electrode. A nozzle of an ink jet recording apparatus, wherein a forming part is formed, and the vibrating member is bonded and fixed at the part where the electric field is not formed. 3. The nozzle according to claim 1, wherein the vibrating member is a diaphragm having an outer peripheral portion held by the holding member. 4. The ink supply device according to claim 1, wherein a flow path of the ink to be supplied to the ink chamber is provided so as to pass through a central portion of the diaphragm through a cylinder of the piezoelectric body. A nozzle of an ink jet recording apparatus characterized by the above-mentioned. 5. The nozzle according to claim 1, wherein the vibrating member is a piston fitted to a cylinder provided on the holding member. 6. The vibrating unit according to claim 1, wherein the vibrating portion is provided inside the orifice plate, an orifice plate having the orifice, a cylindrical piezoelectric body attached to the orifice plate and generating the vibration. And a flow path for supplying the ink to the ink chamber. The orifice plate applies a vibration generated by the piezoelectric body to the ink in the ink chamber. 7. A nozzle for applying vibration of a piezoelectric body to ink in an ink chamber to eject ink from an orifice to generate ink particles, and to charge and deflect the ink particles according to a predetermined recording signal. 7. An ink jet recording apparatus comprising: a deflection control unit for performing printing on a recording medium according to (1), wherein the nozzle is a nozzle of the ink jet recording apparatus according to any one of claims 1 to 6. Ink jet recording device.