JP2001071495A - Ink-jet printer head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To promote miniaturization of a multi-array type printer and manufacture the printer with a high production yield without generating a printing blank part of heads arranged parallel even when the printer is made a multi- array type. SOLUTION: A nozzle absence area 46 of a breadth D0 is present at a most end part (most right end part) of a head chip 40. Landing points by an ink drop fly locus 53 by end nozzles 52-2 of an end area 45 are spaced by a pitch d1 while landing points plotted by the ink drop fly locus 53 by center nozzles 52-1 of a central area 44 are spaced by a pitch (d). A landing point 62 formed by an end nozzle 52-2N of the most end part is positioned to a position inside by d1/2 from a chip boundary 61. A pitch to a landing point by an end nozzle of a most left end part of a right adjacent head chip becomes d1. A nozzle tilt angle θ(n) of each end nozzle 52-2n holds (θ)n=arctan nxD/(NxL), and the pitch d1 holds d1=d+D/N.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet printer head capable of obtaining a printing area wider than an area where discharge nozzles are provided, and suitable for a multi-array ink jet printer.

[0002]

2. Description of the Related Art In recent years, ink jet printers have been widely used. An ink jet printer prints characters and images by ejecting ink droplets from nozzles of an ink jet printer head (hereinafter referred to as a printer head) and absorbing the ink droplets onto a recording medium such as paper or cloth. It is a recording method that generates less noise, does not require special fixing processing, and has good ink use efficiency.

FIGS. 4 (a), 4 (b), and 4 (c) are diagrams showing a schematic manufacturing method and configuration of the above-described printer head. Figure (a)
As shown in FIG.
Is formed by an LSI formation processing technique and a thin film formation processing technique, and is individually cut out and collected from the silicon wafer 2 after completion.

FIG. 1B is a view showing an ink ejection surface of the printer head 1. On the ink ejection surface of the printer head 1, one nozzle row 3 for ejecting ink is formed. Depending on the design policy, one nozzle row 3 may have 64, 128, 256, etc. nozzles 4 at a density of, for example, 300 dpi (dots / inch) (about 12 nozzles per mm). They are arranged in a line.

FIG. 1C is an enlarged cross-sectional view taken along the line AA ′ of FIG. 1B. As shown in FIGS. 2B and 2C, the printer head 1 has a drive circuit 6 composed of an LSI and a resistance heating section 7 composed of a resistive thin film formed on a chip substrate 5. The individual wiring electrodes 8 between the
Are connected, and the common electrode 11 is connected to the power supply terminal 9. The resistance heating section 7 and the individual wiring electrode 8 are
As many as the number of nozzles 4 of the nozzle row 3 formed later are provided. In a predetermined area above these, a partition wall 12 for partitioning and forming an ink passage is formed.

Further, the chip substrate 5 is provided with an ink supply groove 13 extending in parallel with the nozzle row 3 to be formed later.
An ink supply hole 14 is formed in the lower surface of the ink supply hole.

From above, an orifice plate 15 is disposed over the entire surface excluding the area where the signal terminals 18 and the power supply terminals 9 are provided at the end of the chip substrate 5, and heat and pressure are applied to the orifice plate 15. Are bonded and laminated on the upper surface of the partition wall 12 by the thermoplastic adhesive material 16.

The lamination of the orifice plate 15 allows the partition 1
Ink passage 17 having a height of about 10 μm corresponding to a thickness of 2
Is formed between the resistance heating portion 7 and the ink supply groove 13.
Thereafter, the above-described nozzles 4 for discharging ink are formed on the orifice plate 15. Ink is supplied to the ink passage 17 from an external ink cartridge or the like via the ink supply hole 14 and the ink supply groove 13.

If the diameter of the silicon wafer 2 shown in FIG. 1A is, for example, 6 inches, 90 or more printer heads 1 as described above can be collected. The chip-shaped printer head (head chip) 1 cut out from the silicon wafer 2 as a single unit in this manner is die-bonded to a mounting substrate and connected to terminals to complete a printer head in a practical unit.

In recent years, the demand for printers as one of information and communication equipment has been rapidly increasing, and with the increase in demand, there has been an increasing demand for faster printing. Printers are classified into a serial type and a line type in terms of configuration.

In the serial type, the longer the size of the printer head 1 in the sub-scanning direction, that is, the longer the size of the nozzle row 3, the wider the printing in the sub-scanning direction can be performed in one main scan. Can be performed at high speed. That is, the longer the size of the printer head 1 in the sub-scanning direction, the better.

However, if the printer head 1 is configured to be too long in the sub-scanning direction, the load on the drive system for reciprocating the printer head 1 in the sub-scanning direction increases, so that these members are changed to stronger members or shapes. It takes time and trouble. This not only increases the manufacturing cost, but also increases the size of the entire apparatus, and loses the advantage of speeding up the printing process.

Therefore, instead of extending the printer head long in the sub-scanning direction, the printer head is formed to be long in the main scanning direction, that is, to fill the entire printing area in the width direction of the paper, and is fixedly arranged in the apparatus main body so that only the paper is sub-sized. Attention has been paid to a line-type printer that performs printing while transporting in the scanning direction.

FIGS. 5 (a), 5 (b) and 5 (c) are diagrams respectively showing configurations assumed as such a line type printer head. FIG. 1A is a diagram schematically showing a configuration in which a printer head 21 composed of a single chip substrate that is elongated is mounted on a mounting substrate 20.

However, if the size of the paper used for printing is A4 size at the maximum, the printer head 21 composed of such a single chip substrate has a width of the actual printing area excluding the margin, which is approximately About 170mm must be expected. Since this corresponds to about 7 inches, it is necessary to prepare a huge silicon wafer having a diameter of just over 7 inches. However, from this silicon wafer with a diameter of just over 7 inches, only a few chip substrates with a width of 10 mm and a length of 170 mm can be removed along the center line of the silicon wafer, and the rest of the silicon wafer must be discarded. The yield is too bad to be profitable.

Therefore, in practice, the size of the chip substrate is set to be small as shown in FIG. 4B so that a high yield can be obtained, while a large number as shown in FIG. The printer head 1 can be sampled, and the printer head 1 is used as a head chip (hereinafter, referred to as a head chip 1), as shown in FIG.
A method of alternately arranging the head chips 1-1, 1-2,... In a staggered manner at 0 ′ (staggered arrangement) is adopted. The staggered arrangement is performed, for example, because the nozzle 4 at the end of the head chip 1-2 (the upper end and the lower end in the drawing of the printer head 1 in FIG. 4B) and the adjacent head chip 1-1.
This is to maintain the interval in the main scanning direction between the end of the head chip 1-3 and the end of the head chip 1-3 in the main scanning direction to be the same as the arrangement interval in the nozzle row 3.

However, the line-type printer head 22 in which the head chips 1 (1-1, 1-2,...) Are arranged in a staggered manner on the mounting board 20 'as described above has a vertical width in the sub-scanning direction. In addition to the problem that the size of the printer head becomes large and the size of the printer head increases, the ink supply path becomes complicated, which causes a problem of an increase in cost and a decrease in reliability. Further, when the nozzles 4 are cleaned before starting printing or during printing, and when the printer heads 1 are not used, when the lids for preventing drying are required, complicated mechanisms and operations are required. There are also problems.

Therefore, as shown in FIG. 1 (c), a line type printer head in which the head chips 1-1, 1-2,... It is considered that it is most preferable to configure the power supply terminal 23 and the signal terminal 18 of the printer head (head chip) 1 shown in FIG.
Is moved from the vertical end of FIG. 4 (b) to the horizontal end of the chip substrate 5, and the upper and lower ends are made as short as possible as margins. However, this method also has some problems.

FIG. 6A is an enlarged sectional view of the line type printer head 23 for explaining the problem of the multi-array arrangement, and FIG. 6B is proposed to solve the problem. FIG. 4A shows a head chip 1-1 and a head chip 1-2 as head chips adjacent to the line type printer head 23, and has the same components as those in FIGS. 4B and 4C. Are given the same numbers as in FIGS. 4 (b) and 4 (c). FIG. 6A also shows a sheet as a recording medium.

As shown in FIG. 2A, the head chip 1-
1 and the head chip 1-2 each have a chip boundary 24
It is joined by. Head chip 1 (1-1, 1-2)
At the above-mentioned ends, which are seams, there is a nozzle-impossible region 25 in which the nozzle 4 cannot be formed.

This is because the nozzle interval of the seam is
In order to maintain the regular nozzle interval in the inside, it is impossible to reduce the width of the partition 12 at the seam portion to half the width of the partition 12 between the resistance heating portions 7 from the viewpoint of the strength of the chip substrate from the technical point of view. And rather, the partition wall 12 at the seam portion in terms of strength.
This is because it is necessary to make the width of the partition wall 12 between the resistance heating portions 7 wider.

On the other hand, from the nozzle 4, an ink droplet is ejected from the line type printer head 2 as shown by a flight locus 26 in the figure.
3 is ejected perpendicularly to the ink ejection surface 27 and lands on the paper 28. Since the ink is ejected perpendicularly to the ink ejection surface 27 in this manner, the paper 28 conveyed opposite to the line type printer head 23 cannot print on the paper 28 corresponding to the nozzle-impossible area 25. An area 29 is formed, and a blank portion 29 of the print image is formed. In this case, blank vertical stripes are formed in the printed image, and a normal image that can withstand viewing cannot be formed.

In order to solve this problem, as shown in FIG.
1-2, nozzles 33 having the same inclination are formed in the respective connection directions, that is, in the direction of the chip boundary 32, whereby the flight trajectories 34- of the ink droplets having the same inclination in the respective connection directions are formed. There has been proposed a long printer head which forms 1, 34-2.

[0024]

However, in the method shown in FIG. 5B, since each head chip has the same inclination in the connection direction, only three head chips can be connected. More than one cannot be connected. Therefore, in order to form a line type printer head corresponding to a paper width of A4 size, for example, one head chip becomes a long head chip corresponding to half the length, that is, a paper width of A6 size. As in the case of the line type printer head of (a), a problem of low yield occurred, and it was hard to say a practical solution.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances,
An object of the present invention is to provide an ink jet printer head which does not generate a print blank portion between juxtaposed heads even when a multi-array printer is used, promotes miniaturization of a multi-array printer, and can be manufactured with a high production yield.

[0026]

The structure of an ink jet printer head according to the present invention will be described below. An ink jet printer head according to the present invention corresponds to an energy generating element array including a plurality of energy generating elements that are arranged side by side on a substrate so as to be spaced apart from each other and generate pressure energy for discharging ink, and the above energy generating elements. A plurality of ejection nozzles for ejecting ink in a predetermined direction by a pressure generated by the energy generating element, and a recording medium surface separated from the ejection surface from which the ink is ejected by a predetermined length. An ink jet printer head for forming print dots by landing discharge ink, wherein the discharge nozzle row has a plurality of end discharge nozzles located at both ends and a central portion located at a center other than the both ends. A discharge nozzle, and at least the central axis direction of each of the end discharge nozzles is aligned with the normal direction of the discharge surface. Te to the end portion side of the end portion the discharge nozzle is positioned, configured inclined such that the distance of the print dot obtained by said end discharge nozzle are equal.

The inclination of each of the nozzles in the direction of the central axis may be formed only in the end discharge nozzles. In addition, for example, the energy generation elements corresponding to the center discharge nozzles are arranged so that the intervals between all the print dots are equal, as in the third embodiment. May be formed so as to be smaller by a predetermined distance than the interval of.

The inclination of each nozzle in the direction of the central axis is as follows:
For example, as described in claim 4, it is preferable that the printing dots are formed for all the ejection nozzles so that the intervals between all the printing dots are equal.

Further, a plurality of the ink jet printer heads are arranged side by side in the main scanning direction to form a multi-array ink jet printer. In this case, as described in claim 6, the nozzle center axis direction of the end ejection nozzles of the adjacent ink jet printer heads is set such that the intervals between the print dots formed by at least the adjacent end ejection nozzles are equal. It is better to incline. Further, the energy generating element may be a thermal jet type energy generating element for generating bubbles by heat generation and discharging ink, for example.

[0030]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram of a head chip according to one embodiment. The head chip 40 shown in the figure shows a silicon wafer 41, a layer of a partition 42 laminated after a resistance heating part and an electrode are formed thereon, and an orifice plate 43. Are omitted from the drawing. As shown in the figure, the head chip 40 includes a central region 44, end regions 45 on both sides thereof, and a nozzle-free region 46 outside the central region 44. A sheet 48 as a recording medium is transported at a position facing and close to the ink ejection surface 47 (the surface of the orifice plate 43) of the head chip 40.

FIG. 2A is a view for explaining the shape of the nozzles in the central region 44 of the head chip 40 and the flying direction of the ink droplets, and FIG.
FIG. 7 is a diagram illustrating the shape of the nozzles in the end region 45 and the flying direction of the ink droplets. FIGS. 7A and 7B show the resistance heating portion and the partition wall in addition to the nozzle shape not shown in FIG. The configurations of the resistance heating section 49 and the partition 51 shown in FIGS. 6A and 6B are the same as the configurations of the resistance heating section 7 and the partition 15 shown in FIG.

In the center region 44 of the head chip 40 of this embodiment, as shown in FIG. 2A, the nozzle center axis of the nozzle 52 (central nozzle 52-1) is aligned with the ink ejection surface 47 of the head chip 40. It is formed perpendicular to the direction, that is, in the normal direction. The center point 55 on the bottom surface of the nozzle 52 is formed so as to coincide with the perpendicular to the center point 56 of the resistance heating portion 49.

Therefore, as shown in FIG. 3A, the flight locus 53 of the ink droplet ejected from the nozzle 52-1 is
The pitch between print dots formed at the landing point 54 of the ejected ink droplet is perpendicular to the surface of the ink ejection surface 47 and the surface of the resistance heating portion 49.
Is equal to

On the other hand, in the end region 45 of the head chip 40 of the present embodiment, as shown in FIG. -2 (52-2n) nozzle center axis is (n =
1, 2, 3,..., N, where N is the end nozzle 52-2
2), toward the end of the end region 45 where these end nozzles 52-2 are located (to the right in FIG. 2B) with respect to the normal direction of the ink ejection surface 47 of the head chip 40. It is formed to be inclined by an angle θn unique to the nozzle. The hole forming process of the end nozzle 52-2 having an inclination with respect to the center axis of the nozzle can be performed using a hole forming technique using, for example, an excimer laser.

The above-mentioned inclination angle θn is determined by a line perpendicular to the center point 56 of the resistance heating portion 49 and a line connecting the center point 55 on the bottom surface of the end nozzle 52-2 and the center point 58 of the end print dot. The angle to make. Also in this case, the end nozzle 52
The center point 55 of the bottom surface of −2 is the center point 5 of the resistance heating section 49.
6 is formed so as to coincide with the vertical line.

Thus, the end nozzle 52-2 has the angle θn
Therefore, the ink droplets ejected from the end nozzles 52-2 land on the paper 48 with a flying trajectory 57 inclined by the angle θn with respect to the ink ejection surface 47, thereby forming print dots. In this case, the inclination angle θn is set such that the intervals between the print dots obtained by these end nozzles 52-2 are all equal at d1.

Here, the n-th end nozzle 5 in FIG.
Focusing on 2-2n, the intersection point 59 between the center point 58 of the print dot by the end nozzle 52-2n and the perpendicular line formed from the center point 56 of the resistance heating portion 49 and the paper 48 (the impact point of the vertical print dot) )), The distance between the bottom surface of the orifice plate 43 and the sheet 48 is L, and thereafter, xn is represented by x (n) and θn is represented by θ (n), and the following expression x (n) ) = L × tan θ (n) (1) That is, by forming the nozzle 52-2 having the inclination of θ (n) whose nozzle center axis satisfies θ (n) = arctan {x (n) / L} (2) It is possible to land a print dot at the position of the displacement x (n).

In this example, as shown in FIG. 2B, in the end region 45, although the reason will be described later, the resistance heating portion 49 is provided.
, Ie, the print dots land at a pitch d1 wider by Δd than the print dot pitch d in the central area 44 in FIG.

As described above, the adjacent end nozzle 52-
When it is desired to maintain a pitch d1 that is always larger by Δd than the arrangement pitch d of the resistance heating portions 49 between 2n and 52-2n + 1, the inclination angle θn + of the center axis of the nozzle of the end nozzle 52-2n + 1. 1 is larger than the inclination angle θn of the nozzle center axis of the front end nozzle 52-2n. That is, the inclination angle θ of the end nozzle 52-2, that is, the inclination angle of the ink droplet trajectory, gradually widens toward the end.

FIG. 3 is a diagram showing a state in which the inclination angle of the ink droplet flight trajectory in the end area 45 gradually increases toward the end. As shown in the figure, the above-described nozzleless area 46 having a width D0 exists at the extreme end (the rightmost end is shown in the figure) of the head chip 40.

In this example, the end nozzles of the end region 45 correspond to the pitch d of the impact points that draw the ink droplet trajectory 53 by the ink droplets ejected from the center nozzle 52-1 in the center region 44. The landing point which draws the ink droplet trajectory 57 ejected by 52-2 is formed at the pitch d1.
The impact point 62 formed by the end nozzle 52-2N at the extreme end must be formed at a position inside the chip boundary 61 by d1 / 2. As a result, a pitch d1 can be formed between the head chip adjacent to the right side and the landing point of the leftmost end nozzle.

At this time, the displacement amount D of the landing point 62 formed by the end nozzle 52-2N at the end from the intersection of the perpendicular line standing at the center of the resistance heating portion 49 and the sheet 48 is expressed by the following equation. D0−d1 / 2 + d / 2 (3) The displacement amount D is x (N) when n of x (n) in Expression (1) becomes N, that is, x (N). Therefore, Expression (2) derived from Expression (1) Substituting equation (3) into x (n), θ (n) in equation (2) becomes the nozzle inclination angle θ (N) of the end nozzle 52-2N at the end.

Incidentally, the displacement amount D is equal to the pitch d1.
2B is repeated for the immediately preceding displacement from the first end nozzle 52-21 to the extreme end, ie, the N-th end nozzle 52-2N, shown in FIG. It has been added. That is, D = Δd × N. From this, Δd can be derived as follows: Δd = D / N (4)

Since the displacement x (n) of the middle end nozzle 52-2n is x (n) = Δd × n, from the above equation (4), x (n) = n × D / N ... (5) Then, from equation (5) and equation (2) above, θ (n) = arctan {n × (D / N) / L}, that is, θ (n) = arctan ＝ n × D / (N × L)｝ (6) From equation (6), the nozzle inclination angle θ (n) of each end nozzle 52-2n can be obtained from this equation (6). D1 is d1 = d + Δd,
From this and equation (4), d1 = d + D / N (7) Here, if the number N of the end nozzles is made sufficiently large, d1 and d are almost equal and d1 ≒ d, and an image having no problem as a picture, that is, an image having no visually impaired is formed. The problem of the non-printable area 29 described in a) can be solved.

The inclination of the nozzle inclination angle of the end nozzle in the end region 45 at the left end of the head chip 40 is opposite to the inclination of the nozzle inclination angle of the end nozzle in the end region 45 at the right end. It is.

In the head chip 40 described above,
The resistance heating portion 49 and the central nozzle 52 in the central region 44
1, the resistance heating portion 49 of the end region 45 is smaller than the arrangement density d.
And, the arrangement density of the end nozzles 52-2 is increased by Δd. That is, the arrangement density d2 of the resistance heating portion 49 and the end nozzle 52-2 in the end region 45 is given by: d2 = dD / N 8) If so, all the landing pitches of the print dots can be set to d.

In the case where the nozzle is provided at the center of the head chip without discriminating between the center region and the end region, all the nozzles except the one nozzle at the center and the case where no nozzle is provided at the center of the head chip are used. Even if all the nozzles are divided into left and right from the center of the head chip, and the nozzle center axes of all the right and left nozzles are formed to have an inclination toward the end, the landing pitch of the print dots is all d. Can be This is an effective method when the aforementioned N cannot be made sufficiently large.

If the inclination of the center axis of the nozzle of the head chip is made larger and the displacement D of the landing point of the flying ink by the nozzle at the end is made sufficiently large, the print area can be made longer than the head chip. It can be wider. In this case, by randomly selecting and printing the printing dots that overlap between the adjacent head chips, it is possible to reduce the deterioration of the printing quality due to the displacement of the head chips at the time of manufacturing the line head.

When the displacement D of the landing point of the flying ink is sufficiently large and the printing area is wider than the length of the head chip as described above, a gap can be provided between the head chips. The operation of bonding the head chip to the parent substrate becomes easier.

In each of the above-described embodiments and modified examples, the head chip for the printer head of the line printer has been described. The present invention is not limited to the head and may be used for a printer head of a serial printer. This makes it possible to configure a printer head for a serial printer that has a print area wider than the length of the nozzle row, and if the print area on paper is the same as before, the printer head can be downsized to reduce costs. realizable. Further, when the size of the printer head is the same as the conventional one, the printable area on the paper can be enlarged by one main scan, so that the speeding up of the printing can be promoted.

[0051]

As described above in detail, according to the present invention, at least the nozzle center axes of the plurality of ejection nozzles at the end of the head are inclined such that the intervals between the printing dots by these ejection nozzles are equally widened. When the heads are arranged in a straight line to form a multi-array, it is possible to obtain a high-quality print image at a high speed without generating a print blank portion between the arranged heads. Further, since a multi-array type inkjet head can be formed by arranging a plurality of heads in a straight line, the dimension of the entire head in the sub-scanning direction can be formed to be the same as the dimension of the constituent head in the sub-scanning direction. This makes it possible to reduce the size of the multi-array inkjet printer head.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a head chip according to an embodiment.

FIG. 2 (a) is a diagram illustrating the shape of a nozzle in a central region of a head chip and a flying direction of an ink droplet, and FIG. FIG.

FIG. 3 is a diagram illustrating a state in which an inclination angle of an ink droplet flight locus gradually increases toward an end in an end region.

FIGS. 4A, 4B, and 4C are diagrams showing a schematic manufacturing method and configuration of a conventional printer head.

FIGS. 5A, 5B, and 5C are diagrams respectively showing configurations assumed as a conventional line type printer head.

FIG. 6A is an enlarged cross-sectional view of a line type printer head for explaining a problem of a conventional multi-array type arrangement, and FIG. 6B is a diagram showing a method proposed to solve the problem. .

[Explanation of symbols]

1 (1-1, 1-2, 1-3,...) Printer head (head chip) 2 Silicon wafer 3 Nozzle row 4 Nozzle 5 Chip substrate 6 Drive circuit 7 Resistance heating section 8 Individual wiring electrode 9 Power supply terminal DESCRIPTION OF SYMBOLS 11 Common electrode 12 Partition wall 13 Ink supply groove 14 Ink supply hole 15 Orifice plate 16 Thermoplastic adhesive 17 Ink passage 18 Signal terminal 20, 20 ', 20 "Mounting substrate 21 Single chip substrate Long printer head 22 Staggered arrangement Line type printer head 23 Line type printer head 24 Chip boundary 25 Nozzle impossible area 26 Flight trajectory 27 Ink ejection surface 28 Paper 29 Non-printable area 31-2, 31-2 Head chip 32 Chip boundary 33 Nozzle 34-1 34-2 Flight trajectory 40 Head chip 41 Silicon wafer 42 Partition wall 4 Orifice plate 44 Central area 45 End area 46 No-nozzle area 48 Recording medium (paper) 49 Resistance heating part 51 Partition wall 52 Nozzle 52-1 Center nozzle 52-2 End nozzle 53 Ink droplet flight locus 54 Landing point 55 Nozzle bottom Center point 56 Resistance heating part center point 57 Ink droplet flight locus 58 Center point of end print dot 59 Intersection point between paper and vertical line drawn from center point of resistance heating part 61 Chip boundary 62 Landing point

Claims (7)

[Claims] An energy generating element array including a plurality of energy generating elements that are arranged on a substrate and are spaced apart from each other and generate pressure energy for discharging ink;
A discharge nozzle array including a plurality of discharge nozzles provided corresponding to the energy generating element and configured to discharge ink in a predetermined direction by a pressure generated by the energy generating element; An ink jet printer head for forming print dots by landing discharge ink on a long-separated recording medium surface, wherein the discharge nozzle row has a plurality of end discharge nozzles located at both ends and a portion other than the both ends. It is composed of a central discharge nozzle located at the center, and at least the central axis direction of each of the end discharge nozzles is moved toward the end where the end discharge nozzle is located with respect to the normal direction of the discharge surface. An ink jet printer head which is inclined so that intervals between print dots obtained by end discharge nozzles become equal. 2. The ink jet printer head according to claim 1, wherein the inclination in the direction of the central axis of each nozzle is formed only at the end ejection nozzle. 3. The space between the energy generating elements corresponding to the end ejection nozzles is a predetermined distance from the distance between the energy generating elements corresponding to the center discharge nozzles so that the intervals between all the printing dots are equal. 3. The ink jet printer head according to claim 2, wherein the ink jet printer head is formed only smaller. 4. The inkjet according to claim 1, wherein the inclination in the direction of the central axis of each of the nozzles is formed for all of the discharge nozzles such that the intervals between all of the print dots are equal. Printer head. 5. The inkjet printer head according to claim 1,
2. A multi-array ink jet printer formed by juxtaposing a plurality of ink jet printers in the main scanning direction.
5. The ink jet printer head according to 2, 3, or 4. 6. A nozzle center axis direction of said end discharge nozzles is inclined so that intervals between print dots formed by at least adjacent end discharge nozzles of adjacent ink jet printer heads are equal. The ink jet printer head according to claim 5, wherein 7. The energy generating element according to claim 1, wherein the energy generating element is a thermal jet type energy generating element that generates bubbles by generating heat and ejects ink. Inkjet printer head.