JPH11309861A - Ink jet unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make electric connection easily and simultaneously with fixing of a print head to a printed board without using an FPC. SOLUTION: A plurality of drive side conductors 34,... connected with a plurality of actuators in a print head 1 respectively is led out, along with a common side conductor connected commonly with respective actuator, from different side faces 4d, 4b of an actuator board 4 in the print head 1 and connected with a plurality of connecting electrodes arranged on one side face 4e of the actuator board 4 from each side face. A plurality of connecting terminals 53,... corresponding to the plurality of connecting electrodes are formed on a printed board 3 and one side face 4e of the print head 1 is bonded to the printed board 3 with the connecting electrodes of the actuator board 4 abutting against the connecting terminals 53,... of the printed board 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet apparatus.

[0002]

2. Description of the Related Art Conventionally, as an ink jet ejecting apparatus for ejecting ink from an ink jet nozzle to perform recording,
An on-demand system that can be reduced in size and capable of high-speed recording, particularly a system that generates an ink ejection pressure by deforming a piezoelectric element or vaporizing ink by heat, has been widely used.

For example, in an ink jet ejecting apparatus employing a pressure control method using piezoelectric elements, a plurality of ink passages to which ink is supplied from an ink supply source, a plurality of partition walls composed of piezoelectric elements constituting these ink passages,
A print head having a plurality of electrodes provided on the side surfaces of these partition walls, and supplying a drive signal from a drive IC having a built-in drive circuit to the electrodes of the partition walls corresponding to the ink passages for ejecting ink. Then, two adjacent partitions are deformed by shear strain so as to change the volume of the ink passage, and the ink in the ink passage is ejected from the ejection nozzle at the front end.

[0006] Specifically, as shown in FIG. 6, in an ink jet ejecting apparatus for two-color printing, a print head 6 is used.
Numerals 1 and 61 are made of a piezoelectric material having a plurality of ink passages, and a plurality of conductors 6 for supplying power to actuators provided corresponding to the plurality of ink passages are provided on side surfaces.
2, 62 are formed. On the other hand, a wiring pattern connected to the driving ICs 63, 63 is formed on a printed circuit board 64 on which the driving ICs 63, 63 each containing a driving circuit are mounted. The plurality of conductors 6
The wiring patterns 2 and 62 are electrically connected to the wiring patterns by flexible wiring members FPCs 66 and 66. The wiring pattern is connected to a control circuit and a power supply circuit of a machine body such as a printer via a plurality of terminals 65.

[0005]

However, in such an ink jet ejecting apparatus, the printed circuit board 64 is required.
And FPCs 66, 6 connecting the print heads 61, 61
6 are provided with a large number of signal lines corresponding to the number of ink passages, and the FPCs 66, 66 are connected to the plurality of conductors 62, 62 of the print head and the wiring pattern 65 of the printed board.
However, there is a problem that an electrical connection structure for connecting to the power supply becomes complicated.

[0006] In addition, in the case where a plurality of print heads are provided for color printing or the like, between each print head,
You have to provide an interval so that the FPC does not interfere,
In addition to the increase in the size of the ejection device, there is a problem that the mutual position of the ejection nozzles of each print head must be fixed with high accuracy, and the work for that becomes very complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances. When a print head is mounted on a printed circuit board, the electrical connection between the print head and the printed circuit board is made using an FPC. It is an object of the present invention to provide an inkjet ejecting apparatus which can be performed easily without any problem.

[0008]

According to a first aspect of the present invention, there is provided an ink jet ejecting apparatus comprising: a print head having a plurality of actuators for ejecting ink; and a printed board having a wiring pattern for supplying power to each of the actuators. A plurality of drive-side conductors respectively connected to a plurality of actuators, and a common-side conductor commonly connected to each of the actuators, are respectively derived from different side surfaces of the print head, and from each side surface, Connected to a plurality of connection electrodes formed side by side on one side of the print head, a plurality of connection terminals corresponding to the plurality of connection electrodes are formed on the printed circuit board, the connection electrodes of the print head, The one side surface of the print head is in contact with the connection terminal of the printed circuit board, and Those which are fixed to.

According to the first aspect of the present invention, the plurality of drive-side conductors respectively connected to the plurality of actuators of the print head, and the common-side conductor commonly connected to each of the actuators, Guided from different sides of the print head, both conductors do not interfere,
Each side is connected to a plurality of connection electrodes formed side by side on one side of the print head. On the other hand, a plurality of connection terminals corresponding to the plurality of connection electrodes are formed on the printed board, and the printing head is connected to the printing head in a state where the connection electrodes of the print head are in contact with the connection terminals of the printed board. Is fixed to the printed circuit board. In other words, by fixing the print head to the printed board, not only can the print head be mounted on the printed board,
The electrical connection of the plurality of connection electrodes of the print head to the plurality of connection terminals of the wiring pattern of the printed circuit board is also performed at the same time.

According to a second aspect of the present invention, in the ink jet ejecting apparatus of the first aspect, the driving-side conductor, the common-side conductor, and the connection electrode form a conductive layer formed on the surface of the print head in a concave structure. This is formed by dividing by.

According to the second aspect of the present invention, by forming a conductive layer on the surface of the print head in advance,
By dividing by a concave structure by laser processing or the like, a driving-side conductor, a common-side conductor, and a connection electrode having a desired layout are easily formed.

According to a third aspect of the present invention, in the ink jet ejecting apparatus according to the first or second aspect, the one of the print heads is provided.
One side surface is a side surface orthogonal to each side surface from which the drive-side conductor and the common-side conductor are led out, and the drive-side conductor and the common-side conductor are respectively connected to the connection electrode through different ridge lines of a print head. It is connected to.

According to the third aspect of the present invention, the driving-side conductor and the common-side conductor are formed from the respective side surfaces respectively derived.
Through different ridge lines, each is guided to the one side surface orthogonal to each side surface, and the connection electrodes formed side by side without adopting a complicated wiring structure in order to prevent mutual interference. , Easily connected.

According to a fourth aspect of the present invention, in the ink jet apparatus according to any one of the first to third aspects, the print head is formed such that a plurality of ink paths and a plurality of dummy paths are alternately located, A pair of electrodes connected to the driving-side conductor and the common-side conductor are provided on a side surface of the partition wall between the two passages.

According to the fourth aspect of the present invention, by applying a drive voltage to the electrode on the side surface of the partition wall between the passages through the drive-side conductor, the volume of the ink passage is changed and ink is ejected. You. In such a case, the drive-side conductor and the common-side conductor are led out to different side surfaces from the pair of electrodes of the partition without interfering with each other.

According to a fifth aspect of the present invention, in the ink jet apparatus according to any one of the first to fourth aspects, the actuator of the print head is made of a polarized piezoelectric material, and is deformed by applying a voltage to form an ink. It applies an injection pressure, and the connection electrodes of the print head and the connection terminals of the printed board are brazed with a brazing material that melts at a temperature not exceeding the Curie point of the piezoelectric material.

According to the fifth aspect of the present invention, when brazing the connection electrodes of the print head and the connection terminals of the printed circuit board, a brazing material that melts at a temperature not exceeding the Curie point of the piezoelectric material is used. Therefore, the polarization of the piezoelectric material is prevented from being deteriorated or erased by the influence of the heat, and the desired ejection characteristics are surely realized.

According to a sixth aspect of the present invention, in the ink jet apparatus according to any one of the first to fourth aspects, the actuator of the print head is made of a polarized piezoelectric material, and is deformed by applying a voltage to the ink. A jet pressure is applied, and a connection electrode of the print head and a connection terminal of the printed board are fixed using an adhesive having conductivity.

According to the invention of claim 6, when the connection electrode of the print head and the connection terminal of the printed board are fixed,
Since the conductive adhesive is used, it can be fixed without heating, as in the case of brazing,
There is no need to consider the effect of heat on the piezoelectric material.

According to a seventh aspect of the present invention, in the ink jet ejecting apparatus of the fifth or sixth aspect, the actuator of the print head is made of a polarized piezoelectric material, and ink grooves and dummy grooves are alternately formed on one side. A plate member is bonded to the one side of the substrate, and a driving-side conductor, a common-side conductor, and a connection electrode are formed on an outer surface of the actuator substrate.

According to the seventh aspect of the present invention, a plurality of actuators can be easily formed by joining the plate member to the actuator substrate, and a driving-side conductor, a common-side conductor, By forming the connection electrodes on the outer surface of the actuator substrate, they are also easily formed.

The invention according to claim 8 provides a print head having a nozzle surface having a plurality of nozzle holes, a plurality of actuators for ejecting ink, a plurality of connection terminals respectively connected to the actuators, and a plurality of actuators. An ink jet ejecting apparatus comprising a printed circuit board having a wiring pattern having a common terminal connected in common, wherein the print head is provided on a first surface different from the nozzle surface, and one end is connected to the actuator. A plurality of drive-side conductors and a second surface different from the nozzle surface.
And a plurality of drive-side connections that are connected to the other end of the drive-side conductor and that are in electrical contact with connection terminals of the printed circuit board in a state in which a print head is fixed to the printed circuit board. An electrode, provided on the second surface,
A common connection electrode that is commonly connected to each of the actuators and electrically contacts a common terminal of the printed circuit board with a print head fixed to the printed circuit board.

According to the eighth aspect of the present invention, a plurality of drive-side conductors each having one end connected to an actuator of the print head are provided on the first surface different from the nozzle surface of the print head. On a second surface different from the nozzle surface, a common-side connection electrode commonly connected to the actuators is provided together with a plurality of drive-side connection electrodes connected to the other end of the drive-side conductor. . Then, with the print head fixed to the printed board, the drive-side connection electrode and the common-side connection electrode of the print head are in electrical contact with the connection terminal and the common terminal of the printed board. Therefore, as in the case of the first aspect of the present invention, by fixing the print head to the printed circuit board, each connection electrode of the print head comes into electrical contact with each terminal of the printed circuit board. The connection is being made at the same time.

According to a ninth aspect of the present invention, in the ink jet ejecting apparatus of the eighth aspect, the print head is formed so that a plurality of ink passages and a plurality of dummy passages are alternately located, and a partition wall between the two passages. A pair of electrodes connected to the drive-side conductor and the common-side connection electrode, the first surface is a side surface parallel to a row formed by the plurality of actuators, and the second surface is A side surface adjacent to the nozzle surface and the first surface, and a side surface opposite to the nozzle surface and adjacent to the first surface and the second surface; Is connected to a manifold member for distributing the pressure.

According to the ninth aspect of the present invention, the first surface of the print head is a side surface parallel to a row formed by the plurality of actuators, and the second surface is the nozzle surface and the first surface. The electrode formed on the side surface of the partition wall between the ink passage and the dummy passage is formed on the side surface adjacent to the first surface through the driving-side conductor on the first surface without employing a complicated wiring structure. 2 is connected to the drive-side connection electrode. Also,
Since a manifold member that distributes ink to the plurality of ink passages is connected to a surface opposite to the nozzle surface and adjacent to the first surface and the second surface, a print head and The manifold member is attached to the print head irrespective of the fixing work with the printed circuit board.

According to a tenth aspect of the present invention, in the ink jet apparatus according to any one of the first to ninth aspects, the plurality of print heads are provided, and the printed circuit board is provided in a plurality corresponding to the plurality of print heads. It has a set of wiring patterns.

According to the tenth aspect of the present invention, even if a plurality of print heads are provided for color printing or the like, wiring materials such as FPCs do not interfere with each other as in the related art.
The interval between the print heads is reduced, and the size of the ejection device can be reduced. In addition, the mutual positional relationship between a plurality of print heads can be secured with high accuracy and ease on a single printed circuit board.
Fine printing with a uniform print position by a plurality of print heads is performed.

[0028]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing the relationship between a print head, a printed circuit board, and a manifold member of an ink jet apparatus according to the present invention.

As shown in FIG. 1, the ink jet ejecting apparatus according to the present invention includes a print head 1 having a plurality of actuators for ejecting ink, and a printed board 3 having a wiring pattern 2 for supplying power to each of the actuators. .

The print head 1 includes an actuator member 6 formed by joining a pair of actuator substrates 4 and 4 with an adhesive while sandwiching a plate member 5 therebetween. A nozzle plate 7 is bonded to a front end surface of the actuator member 6 (a front end surface 4a of the actuator substrate 4 and a front end surface 5a of the plate member 5; see FIGS. 3A and 3B) with an adhesive. And
The outer surface of the nozzle plate 7 has a plurality of nozzle holes 7a,.
Are arranged in a row.

The actuator member 6 has a rear end surface (a rear end surface 4b of the actuator substrate 4 and a rear end surface 5b of the plate member 5) which is a surface opposite to the front end surface on which the nozzle plate 7 is provided. A manifold member 8 for supplying ink is joined.

The actuator substrate 4 is made of a piezoelectric material such as lead zirconate titanate (PZT) or the like, and is polarized in the thickness direction of the actuator substrate 4, so that the print head 1 applies a voltage. To give an ejection pressure to the ink. In addition, as the piezoelectric material, lead zirconate titanate (PZ) is used.
T) In addition to ceramic materials, lead titanate (PT)
Ceramic material can also be used.

The upper surface 4c of the actuator substrate 4 on the side to which the plate member 5 is joined is shown in FIG.
As shown in (b), a plurality of ink grooves 11,... And horizontal dummy grooves 12,. And the ink grooves 11,... And the horizontal dummy grooves 12,.
Each of the partition walls 13, 13 located therebetween is formed of a plurality of layers of piezoelectric material polarized in the direction parallel to the depth direction of the groove and in the direction opposite to each other.

The ink grooves 11 penetrate the front and rear end surfaces of the actuator substrate 4. On the other hand, the horizontal dummy groove 12 is closed in the vicinity of the rear end face 4b of the actuator substrate 4. On the front end surface 4a side of the actuator substrate 4, one end is provided at a position corresponding to the horizontal dummy groove 12 as shown in FIG.
Vertical dummy groove 14 that communicates with the other end and opens on the lower surface 4d side
Are formed.

Then, as shown in FIGS. 3A and 3B,
By bonding the upper surfaces 4c, 4c of the actuator substrates 4, 4 to the both side surfaces 5c, 5d of the plate member 5 via an adhesive, respectively, the ink grooves 11,. The longitudinal openings are closed by the plate member 5, thereby forming a plurality of ink passages 21 and a plurality of horizontal dummy passages 22 as shown in FIG. The nozzle holes 7a of the nozzle plate 7 correspond to only the ink passages 21, and the manifold member 8 communicates with the rear ends of the plurality of ink passages 21.

Further, the groove surfaces of the ink grooves 11,..., The groove surfaces of the horizontal dummy grooves 12,..., The rear end surface 4b (the side where the horizontal dummy grooves 12,. A conductive layer made of a conductive material such as Ni is formed on the lower surface 4d by vapor deposition or plating.

Then, the front end face 4 of the actuator substrate 4
a and the upper surface 4c, the conductive layer is removed, and the ink grooves 11,
The conductive layers on the respective groove surfaces of the horizontal dummy grooves 12,... Are independent of each other, and the electrodes 31 are formed on the groove surfaces of the ink grooves 11,. The first divided groove 3 in which the conductive layer is linearly removed by, for example, laser processing, is formed on the groove bottom surface of the lateral dummy groove 12.
2a is formed from the front end side to the rear end side, and the conductive layer on the groove surface of the lateral dummy groove 12 is formed by two independent electrodes 33,
33. In the vertical dummy groove 14 communicating with the horizontal dummy groove 12, the second divided groove 3 connected to the first divided groove 32a is provided.
2b is formed. Therefore, each of the lateral dummy grooves 12
The electrodes 33, 33 provided on both side surfaces of the groove are connected to the outside, that is, the actuator substrate 4 through the vertical dummy groove 14.
Are drawn out to the lower surface 4d (first side surface) which is a side surface parallel to the row formed by the plurality of actuators.

Further, a third divided groove 32c having one end connected to the second divided groove 32b is formed in the conductive layer on the lower surface 4d of the actuator substrate 4 along the longitudinal direction of the lateral dummy groove 12. The other end of the third divided groove 32c is connected to one end of a fourth divided groove 32d formed so as to extend orthogonally to the side surface 4e.

A plurality of drive-side conductors 34 composed of a conductive layer are formed on the lower surface 4d of the actuator substrate 4 so as to be insulated from each other by the third and fourth division grooves 32c and 32d. Each drive-side conductor 34 is connected to the ink groove 11.
Lateral dummy groove 1 of a pair of partition walls 13 adjacent to each other
The two electrodes 33 on the second side are electrically connected to each other via the vertical dummy grooves 14.

The rear end face 4b of the actuator substrate 4
Is a common side conductor 35, and the electrodes 31 in all the ink grooves 11 are connected to the common side conductor 35 through the rear end openings of the ink grooves 11.

Thus, in the print head 1, as shown in detail in FIGS. 3 and 4, a plurality of drive-side conductors 34 each having one end connected to each of a plurality of actuators, A common-side conductor 35 commonly connected to each of the actuators is provided on a different side surface of the print head 1, that is, on a lower surface 4d and a rear end surface 4b different from the surface on which the nozzle plate 7 is provided.

A side surface 4e (second surface) of the actuator substrate 4 perpendicular to the side surfaces (lower surface 4d and rear end surface 4b) from which the driving-side conductors 34,... , Drive-side connection electrodes 41,... And common-side connection electrodes 42 are formed side by side, and drive-side conductors 34,. It is connected. As described above, in each conductor, the electrodes 31 and 33 are guided from the front and rear ends of the actuator substrate 4 through the different ridge lines S1 and S2 to the side surface 4e with sufficient width without interfering with each other. The drive-side connection electrodes 41 are insulated by a plurality of fifth divisional grooves 32e, one end of which is connected to the other end of the fourth divisional groove 32d. A sixth divided groove 32f extending in a direction orthogonal to the fifth divided grooves 32e,.
Is insulated.

A pair of partitions 13, 13 sandwiching the ink passage 21, and a pair of electrodes 3 formed on both side surfaces thereof
1, 33 as a set of actuators,
By applying a driving voltage to the electrodes 33, 33 outside the third and third electrodes 13, and grounding the electrodes 31, 31 inside the ink passage 21 between the pair of the first and second partitions 13, 13, the piezoelectric material is polarized inside the partitions. An electric field in a direction perpendicular to the direction is generated, and the polarized partitions 13, 13 are separated from the ink passage 21.
Is deformed in the direction in which the volume changes, and ink can be ejected from the nozzle holes 7a.

On the other hand, the printed board 3 is formed of a material having rigidity, and a known printed wiring or a thin metal film formed on the surface is subjected to an etching process to remove unnecessary portions, thereby forming the wiring. Pattern 2 is formed. One end of the wiring pattern 2 is connected to the drive IC 51. At the other end of the wiring pattern 2, when the print head 1 is mounted at a predetermined position on the printed circuit board 3, a plurality of drive-side connection electrodes 41 of the print head 1 are connected.
. And a plurality of connection terminals 5 in contact with the common-side connection electrode 42
The common terminal 54 is provided. That is, the connection terminals 53 are connected to the drive-side connection electrodes 4.
Are provided corresponding to the connection electrodes 41,.
The common terminal 54 is provided corresponding to the common-side connection electrode 42 and electrically connected to the common-side connection electrode 42 while being electrically connected to the actuators. By doing so, they are commonly connected to each of the actuators.

The drive IC 51 converts the injection / non-injection data serially input for each actuator into parallel data and outputs the data to each actuator.

.. And the common side connection electrode 42 of the print head 1 are in contact with the connection terminals 53,. The side surfaces of the head 1 (the side surfaces 4e, 4e of the actuator substrates 4, 4 and the side surface 5e of the plate member 5 located therebetween) are fixed on the printed circuit board 3. The side surface of the print head 1 is fixed to the printed circuit board 3 by using a brazing material and / or an adhesive which will be described later.

The connection electrodes 41 of the print head 1,.
, And the common terminal 54 of the printed circuit board 3 are performed using a brazing material that melts at a temperature not exceeding the Curie point of the piezoelectric material. That is, the printed circuit board 3 having the connection terminals 53,... And the common terminals 54 on which the conductive brazing material layer is formed in advance.
Are prepared, and the connection terminals 53 of the printed circuit board 3 and the common terminal 54 are connected to the connection electrodes 41 of the actuator substrate 4.
The heating is performed by heating and melting the brazing material in a state where the brazing material is brought into contact with.

The use of the brazing material which melts at a temperature not exceeding the Curie point of the piezoelectric material prevents the polarization of the actuator substrate 4 from being deteriorated or erased due to the heat. Because
Desired injection characteristics can be reliably achieved.

In place of the brazing material, it is also possible to use a conductive adhesive. Specifically, for example, one of the plurality of connection electrodes on the print head 1 side and the plurality of connection terminals on the print board 3 side is used as a conductive protrusion, and the print head 1 and the print board 3 are anisotropically conductively bonded. By pressing each other with an agent interposed therebetween, the adhesive at the portion corresponding to the conductive protrusion has conductivity, and the connection electrode and the connection terminal are electrically connected and bonded.

With the above construction, the mounting of the print head 1 on the printed circuit board 3 and the electrical connection of the actuators of the print head 1 with the connection terminals 53,. And the workability of assembling can be improved. In particular, since each actuator of the print head 1 is directly connected to each terminal 53,.
It is not necessary to use C, the configuration can be simplified, and the cost can be reduced by reducing the number of parts.

When a plurality of print heads are used as in a color printing apparatus, as shown in FIGS. 4 and 5, the printed circuit board 3A has a plurality of sets corresponding to the plurality of print heads 1,. , And a plurality of print heads 1,... Can be attached to them.
In this manner, since it is not necessary to use a wiring member such as an FPC as in the related art, they can be prevented from interfering with each other, the interval between the print heads 1,. . Further, the mutual positional relationship between the plurality of print heads 1,... Can be ensured with high accuracy and easily on one printed circuit board 3A. It becomes possible.

In the above description, one embodiment of the present invention has been described. However, the present invention is not limited to this, and various modifications can be made as described below. (1) In the above embodiment, the drive IC is mounted on the printed circuit board 3 so as to secure a sufficient mounting space according to the size of the drive IC.
May be provided on the print head 1 side. In this way, the heat generated by the drive IC by the ink ejection operation is efficiently transmitted to the print head 1, and can be efficiently radiated from the print head 1 or through the ejected ink. Since the heat in the ink passage warms the ink in the ink passage and lowers the viscosity of the ink, there is an advantage that the ink ejection performance is improved. (2) In the above embodiment, the present invention is applied to a device that ejects ink in an ink passage using a piezoelectric material that undergoes mechanical deformation when a voltage is applied.
The present invention is also applicable to a so-called bubble jet type ink jet ejecting apparatus which instantaneously gives heat generated by a heating resistor (zirconium boride, etc.) to the ink, causes the film to boil, and ejects the ink by utilizing the volume expansion of the boiling bubbles. be able to. (3) In the above embodiment, two actuator substrates 4 and 4 are joined to the upper and lower sides of one plate
Although the description has been given of the case where the present invention is applied to a print head having a row of actuators, the present invention can also be applied to a print head in which one actuator substrate is joined to one plate member. (4) The present invention can be applied not only to a print head having a nozzle opened in a horizontal direction but also to a print head having a nozzle directed in an arbitrary direction such as downward or inclined.

[0054]

The present invention is embodied in the form described above, and has the following effects.

According to a first aspect of the present invention, a plurality of drive-side conductors respectively connected to a plurality of actuators and a common-side conductor commonly connected to each of the actuators are formed from different sides of the print head. While deriving and connecting from each side to a plurality of connection electrodes formed side by side on the one side of the print head, a plurality of connection terminals corresponding to the plurality of connection electrodes are formed on a printed board, With the connection electrode of the print head in contact with the connection terminal of the printed circuit board,
Since the two side surfaces are fixed to the printed circuit board, the mounting of the print head on the printed circuit board and the electrical connection between the plurality of connection electrodes and the connection terminals can be performed simultaneously and easily. In addition, the plurality of drive-side conductors and the common-side conductor are led out from different side surfaces of the print head, so that both conductors do not interfere with each other and can be formed with a sufficient width. Can,
The electrical connection can be secured. In addition, since it is not necessary to use an FPC as a wiring material as in the related art, it is possible to simplify the electrical connection configuration between the print head and the printed circuit board, and to reduce costs by reducing the number of parts. it can.

According to a second aspect of the present invention, the drive-side conductor, the common-side conductor, and the connection electrode are formed by dividing the conductive layer formed on the surface of the print head into a concave structure by laser processing or the like. With this configuration, it is possible to easily form the driving-side conductor, the common-side conductor, and the connection electrode having a desired layout.

According to a third aspect of the present invention, the one side surface of the print head is a side surface orthogonal to each of the side surfaces from which the drive-side conductor and the common-side conductor are led out. The driving-side conductor and the common-side conductor can be connected to the connection electrodes via the ridges from the respective side surfaces that are respectively derived by utilizing adjacent surfaces through the ridges, so that they do not interfere with each other. There is no need to employ a complicated wiring structure to prevent this, and the electrical connection structure is simplified.

According to a fourth aspect of the present invention, a print head is formed so that a plurality of ink passages and a plurality of dummy passages are alternately located, and a drive-side conductor and a common conductor are provided on the side surface of the partition wall between the two passages. Since a pair of electrodes connected to the side conductor are provided, the drive side conductor and the common side conductor are easily led out to different sides without interfering with each other from the pair of electrodes of the partition wall. Item 1 can be easily realized.

According to a fifth aspect of the present invention, the actuator of the print head is made of a polarized piezoelectric material, and is deformed by applying a voltage to apply an ejection pressure to the ink. Since the connection terminals of the printed circuit board are brazed with a brazing material that melts at a temperature not exceeding the Curie point of the piezoelectric material, the polarization of the piezoelectric material is deteriorated or erased due to the influence of heat during brazing. It is possible to prevent the injection characteristics from being caused and to surely achieve the desired injection characteristics.

According to a sixth aspect of the present invention, the actuator of the print head is made of a polarized piezoelectric material, and is deformed by applying a voltage to apply an ejection pressure to the ink. Since the electrodes and the connection terminals of the printed circuit board are fixed by using an adhesive having conductivity, the electrodes and the connection terminals can be fixed without heating, such as in the case of brazing. There is no need to consider the effects of heat.

According to a seventh aspect of the present invention, a plurality of actuators are formed by joining a plate member to an actuator substrate, and a driving-side conductor, a common-side conductor, and a connection electrode for driving the actuators are connected to the actuator substrate. Since it is formed on the outer surface, a print head having a plurality of actuators for ejecting ink can be easily manufactured.

According to an eighth aspect of the present invention, when the print head is fixed to the printed board, the drive-side connection electrode and the common-side connection electrode on different side surfaces of the print head are electrically connected to the connection terminal and the common terminal of the printed board. As in the first aspect of the present invention, the F
It is not necessary to use a PC, the electrical connection configuration can be simplified, and the cost can be reduced.

According to a ninth aspect of the present invention, the first surface is a side surface parallel to the row formed by the plurality of actuators, and the second surface is
Since the side surface is adjacent to the nozzle surface and the first surface, the electrode formed on the side surface between the ink passage and the dummy passage is connected to the second surface via the drive-side conductor of the first surface. Can be easily connected to the drive-side connection electrode, and the ink is distributed to the ink passage on a surface opposite to the nozzle surface and adjacent to the first surface and the second surface. Since the manifold member is connected to the print head, the manifold member can be attached to the print head irrespective of the fixing work between the print head and the printed circuit board.

According to a tenth aspect of the present invention, even if a plurality of print heads are provided for color printing or the like, the distance between the print heads can be reduced by eliminating the interference of wiring materials such as an FPC as in the related art. The size of the injection device can be reduced. Further, the mutual positional relationship of the plurality of print heads can be ensured with high accuracy and easily on one printed circuit board, so that the print positions of the plurality of print heads can be neatly printed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a relationship between a print head, a printed board, and a manifold member of an ink jet apparatus according to the present invention.

2 (a) is a perspective view showing an actuator substrate with an intermediate portion omitted, and FIG. 2 (b) is a perspective view showing the actuator substrate shown in FIG.

FIG. 3A is a perspective view showing the front end side of the actuator member facing upward, and FIG. 3B is a perspective view showing the rear end side of the actuator member facing upward.

FIG. 4 is a perspective view of a state in which a plurality of print heads are fixed to a printed circuit board as viewed from the front side.

FIG. 5 is a perspective view of a state in which a plurality of print heads are fixed to a printed circuit board as viewed from the back side.

FIG. 6 is a perspective view showing a conventional example.

[Explanation of symbols]

 Reference Signs List 1 print head 2 wiring pattern 2A wiring pattern 3 printed board 3A printed board 4 actuator board 4a front end face 4b rear end face (second side face) 4c top face 4d bottom face (first side face) 4e side face (one side face) 7 nozzle plate 7a Nozzle hole 8 Manifold member 34 Drive side conductor 35 Common side conductor 41 Drive side connection electrode 42 Common side connection electrode 53 Connection terminal 54 Common terminal

Claims (10)

[Claims] 1. An ink jet apparatus comprising: a print head having a plurality of actuators for ejecting ink; and a printed circuit board having a wiring pattern for supplying power to each of the actuators, wherein a plurality of actuators respectively connected to the plurality of actuators are provided. A drive-side conductor and a common-side conductor commonly connected to each of the actuators are respectively derived from different side surfaces of the print head, and are formed side by side on one side surface of the print head from each side surface. A plurality of connection terminals corresponding to the plurality of connection electrodes are formed on the printed board, and the connection electrodes of the print head are in contact with the connection terminals of the print board. Wherein the one side surface of the print head is fixed to the printed circuit board. Inkjet ejector. 2. The printing apparatus according to claim 1, wherein the driving-side conductor, the common-side conductor, and the connection electrode are formed by dividing a conductive layer formed on a surface of the print head into a concave structure. The ink jet ejection device according to any one of the preceding claims. 3. The one side surface of the print head is a side surface orthogonal to each side surface from which the drive-side conductor and the common-side conductor are led out, and the drive-side conductor and the common-side conductor are provided. 3. The ink jet ejecting apparatus according to claim 1, wherein each of said plurality of ink jet heads is connected to said connection electrode via a different ridge line of a print head. 4. The print head is formed so that a plurality of ink passages and a plurality of dummy passages are alternately positioned, and the drive-side conductor and the common-side conductor are provided on side surfaces of a partition wall between the two passages. The inkjet ejecting apparatus according to any one of claims 1 to 3, further comprising a pair of electrodes connected to each other. 5. An actuator of the print head is made of a polarized piezoelectric material and deforms by applying a voltage to apply an ejection pressure to ink. The connection electrode of the print head and the printed board The inkjet terminal according to any one of claims 1 to 4, wherein the connection terminals are brazed with a brazing material that melts at a temperature not exceeding the Curie point of the piezoelectric material. 6. An actuator of the print head is made of a polarized piezoelectric material, deforms by applying a voltage, and applies an ejection pressure to ink. The connection electrode of the print head, The ink jet apparatus according to any one of claims 1 to 4, wherein the connection terminal of the printed circuit board is fixed using a conductive adhesive. 7. An actuator of the print head is formed by joining a plate member to one side of an actuator substrate made of a polarized piezoelectric material and having ink grooves and dummy grooves formed alternately on one side, On the outer surface of the actuator substrate, a driving-side conductor,
7. The inkjet apparatus according to claim 5, wherein the common-side conductor and the connection electrode are formed. 8. A print head having a nozzle surface having a plurality of nozzle holes, a plurality of actuators for ejecting ink, a plurality of connection terminals individually connected to the actuators, and a common terminal commonly connected to the actuators. An ink jet apparatus comprising: a printed circuit board having a wiring pattern having terminals; wherein the print head is provided on a first surface different from the nozzle surface, and a plurality of driving sides each having one end connected to the actuator. A conductor, provided on a second surface different from the nozzle surface, connected to the other end of the drive-side conductor, and connected to the printed circuit board in a state where a print head is fixed to the printed circuit board; A plurality of drive-side connection electrodes that are in electrical contact with the terminals; and a plurality of drive-side connection electrodes that are provided on the second surface and are commonly connected to the actuators. Together with the ink jet ejecting apparatus characterized by comprising a common-side connecting electrode in electrical contact with the common terminal of the printed circuit board in a state where the print head is secured to the printed circuit board. 9. The print head is formed so that a plurality of ink passages and a plurality of dummy passages are alternately positioned, and the drive-side conductor and the common-side connection electrode are provided on side surfaces of a partition wall between the two passages. The first surface is a side surface parallel to a row formed by the plurality of actuators, and the second surface is the nozzle surface and the first surface.
A manifold member that distributes ink to the plurality of ink passages is connected to a side surface that is adjacent to the nozzle surface and is opposite to the nozzle surface and adjacent to the first surface and the second surface. The ink jet device according to claim 8, wherein the ink jet device is used. 10. The print head according to claim 1, wherein a plurality of print heads are provided, and the printed circuit board has a plurality of sets of wiring patterns corresponding to the plurality of print heads.
An inkjet ejector according to any one of the above.