JP2012084566A - Formation method of lamination printing part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve electrical characteristics of a lamination printing part by reducing irregularities on the surface of the lamination printing part formed by an ink jet method.SOLUTION: The lamination printing part is formed by repeating a step for forming and drying a first layer printing part consisting of an arrangement of a plurality of rows of ink dots by discharging ink having predetermined electrical characteristics onto a circuit board by an ink jet method, and then forming and drying the next layer printing part consisting of an arrangement of a plurality of rows of ink dots by discharging ink onto the printing part for a predetermined number of times. In the steps for forming the printing parts of the second and subsequent layers, the printing parts of the second and subsequent layers are formed in the arrangement/discharge order of ink dots different from that of the first layer printing part.

Description

  The present invention relates to a method for forming a multi-layer printing portion that forms a multi-layer printing portion by an inkjet method.

  Patent Document 1 (Japanese Patent Application Laid-Open No. 2007-260677) describes a technique for forming a laminated printing portion by an inkjet method. In this laminated printing technique, a first step of ejecting conductive ink at a pitch larger than the diameter of ink dots by an inkjet method, and a first step of ejecting ink dots between the ink dots to form one conductive line. It consists of two steps.

JP 2007-260677 A

The present inventors have been studying a technique for laminating and printing resistors and the like by an ink jet method. For example, after applying the technique of the above-mentioned Patent Document 1 and ejecting ink having a predetermined electrical characteristic onto a circuit board by an ink jet method, a first-layer printing portion composed of an array of a plurality of rows of ink dots is formed. It is considered that a layered printing unit is formed by repeating a predetermined number of times a process of ejecting ink on the printing unit by a similar method to form a printing unit of a next layer composed of an array of ink dots in a plurality of rows. It is done.
However, this multi-layer printing technique has a drawback in that the surface of the multi-layer printing section has irregularities that follow the shape of the ink dots, resulting in poor electrical characteristics.

  Accordingly, the problem to be solved by the present invention is to provide a method for forming a multilayer printed portion that can improve the electrical characteristics of the multilayer printed portion by reducing the unevenness of the surface of the multilayer printed portion formed by the inkjet method. .

  In order to solve the above-mentioned problem, the invention according to claim 1 is to form a first-layer printing portion comprising an array of ink dots in a plurality of rows by ejecting ink having predetermined electrical characteristics onto a circuit board by an inkjet method. After that, the step of forming the multilayer printing unit by repeating the process of discharging the ink onto the printing unit and forming the printing unit of the next layer composed of an array of ink dots of a plurality of lines is formed a predetermined number of times. In the method, in the step of forming the second and subsequent printing sections, the second and subsequent printing sections are formed with an ink dot arrangement and ejection order different from the ink dot arrangement and ejection order of the first layer printing section. It is what you do. In this way, for example, the first layer printing section is formed with an array of ink dots adapted to characteristics such as the wettability of the circuit board, and the second and subsequent printing sections are the previously formed printing sections. It is possible to form the ink dots with an arrangement of ink dots adapted to characteristics such as wettability of the surface, and to improve the electrical characteristics by reducing the unevenness of the surface of the laminated printing portion.

  Specifically, as in claim 2, in the step of forming the second and subsequent printing sections, the ink dots are ejected at a predetermined pitch in the row direction at intervals smaller than the diameter of the ink dots, and the ink in each row The line feed width may be set so that the dots partially overlap the ink dots in the adjacent rows. In this way, undried ink dots that partially overlap each other are stabilized with a smooth surface so that the surface energy is minimized.

  In this case, as described in claim 3, it is preferable that the ink dots in each row are ejected with a half pitch shift in the row direction from the ink dots in the adjacent rows. In this way, the overlapping amount of each ink dot can be equalized, and the unevenness on the surface of the laminated printing portion can be minimized.

  By the way, if the ink dots are continuously stacked and ejected without drying the ink dots in the process of forming the second and subsequent printing portions, a smooth surface with less unevenness can be formed. Aggregates to form large ink aggregates. For this reason, when the discharge start point is located at the outer peripheral end of the printing unit, the ink aggregated at the discharge start point overflows, and the shape of the laminated printing unit tends to be non-uniform.

  In consideration of this point, as in claim 4, in the step of forming the second and subsequent layers, the ink dots are ejected from the position inside the print unit so as to partially overlap in the line direction and line feed direction. Finally, ink dots may be ejected so as to partially overlap in the row direction and the line feed direction along the outer periphery of the printing unit. In this way, since the discharge start point is on the inside of the printing portion, the overflow of ink that aggregates at the discharge start point can be prevented by the arrangement pattern of the ink dots on the outer peripheral side, and the shape of the laminated printing portion is nonuniform Can be prevented.

  Further, as in claim 5, in the step of forming the second and subsequent printing portions, it is preferable to dry the printing portion of the previously formed layer and then form the printing portion of the next layer. In this way, the printing part of each layer can be formed uniformly.

  According to a sixth aspect of the present invention, in the step of forming the first-layer printed portion, the first dot is formed by ejecting ink dots at a predetermined pitch at intervals smaller than the diameter of the ink dots in the row direction and the line feed direction. After forming the pattern and drying the first dot pattern, the second dot pattern is ejected at the predetermined pitch by shifting the ink dots by a half pitch in the row direction so as to overlap each row of the first dot pattern. After the second dot pattern is dried, ink dots are shifted by a half pitch in the row direction between the rows of the second dot pattern to form the third dot pattern. Then, after drying the third dot pattern, the ink dots are shifted by a half pitch in the row direction so as to overlap the respective rows of the third dot pattern, and the predetermined pitch is reached. To form a fourth dot pattern may be dried by discharging at. In this way, the first layer printed portion can be formed uniformly without causing ink aggregation on the circuit board.

FIG. 1 is a process diagram for explaining a method (No. 1) for forming a printed portion of the first layer according to the first embodiment. FIG. 2 is a process diagram for explaining the method (No. 2) for forming the first printed portion of the first embodiment. FIG. 3 is a process diagram for explaining a method (No. 1) for forming the second and subsequent printing portions of the first embodiment. FIG. 4 is a process diagram for explaining a method (No. 2) for forming the second and subsequent printing portions in the first embodiment. FIG. 5 is a diagram for explaining a method for forming the second and subsequent printing portions according to the second embodiment. FIG. 6 is a process diagram illustrating a method for forming the second and subsequent printing portions of Example 3. FIG. 7 is a diagram for explaining a method for forming the second and subsequent printing portions according to the fourth embodiment. FIG. 8 is a process diagram illustrating a method for forming the second and subsequent printing portions of Example 5.

  Hereinafter, five examples 1 to 5 embodying a mode for carrying out the present invention will be described.

A first embodiment of the present invention will be described with reference to FIGS.
The method for forming the laminated printing portion of the first embodiment changes the material (conductor, resistor, dielectric, etc.) included in the ink to be used, thereby changing the laminated printing conductive pattern, the laminated printing resistor, and the laminated printing. The present invention can be applied to various laminated printed electrical component forming methods such as dielectrics.

  In the method of forming the laminated printing portion of the first embodiment, ink having a predetermined electrical characteristic is ejected onto a circuit board by an ink jet method to form a first printing portion composed of an array of ink dots in a plurality of rows and then dried. After that, the step of discharging the ink onto the printing unit to form a printing unit of the next layer consisting of an array of ink dots in a plurality of rows and drying it is repeated a predetermined number of times to form a laminated printing unit A method of forming a printing unit, wherein a second layer is formed by an ink dot arrangement / ejection order different from an ink dot arrangement / ejection order of the first layer printing unit in a process of forming the second and subsequent layers. The subsequent printing section is formed. Hereinafter, a method for forming the first printed portion and a method for forming the second and subsequent printed portions will be described with reference to FIGS.

[Method for Forming Printed Part of First Layer]
As shown in FIG. 1, the first layer printing portion is formed by printing a dot pattern four times in total and drying each printing. In the first dot pattern printing, an ink jet printer ejects ink dots on a circuit board in a row direction and a line feed direction at a predetermined pitch with an interval smaller than the diameter of the ink dots. The first dot pattern consisting of the array is printed. Thereafter, the first dot pattern is dried for a predetermined time.

  Thereafter, the process proceeds to the second dot pattern printing process, and the ink dots are shifted by a half pitch in the row direction so as to overlap each row of the first dot pattern, and then ejected at the same pitch as the first dot pattern. Print the dot pattern. As a result, each ink dot of the second dot pattern is printed across the row of ink dots in each row of the first dot pattern. After printing the second dot pattern, the second dot pattern is dried for a predetermined time.

  Thereafter, the process proceeds to the third dot pattern printing process, and the ink dots are shifted by a half pitch between the rows of the second dot pattern in the row direction and ejected at the same pitch as the second dot pattern. Print the pattern. As a result, the ink dots of each row of the third dot pattern are printed overlapping each row of the second dot pattern, and each ink dot of the third dot pattern is changed to four ink dots of the second dot pattern. It is in a state of being printed across. After printing the third dot pattern, the third dot pattern is dried for a predetermined time.

  Thereafter, the process proceeds to the fourth dot pattern printing process, and the ink dots are shifted by a half pitch in the row direction so as to overlap each row of the third dot pattern, and ejected at the same pitch as the third dot pattern. Print the dot pattern. As a result, each ink dot of the fourth dot pattern is printed across the ink dots in each row of the third dot pattern in the row direction. After printing the fourth dot pattern, the fourth dot pattern is dried for a predetermined time.

Through the steps described above, the first-layer printing portion is formed.
Note that the method for forming the first-layer printing portion is not limited to the above-described method. For example, as shown in FIG. Printing may be performed at pitch times, or printing may be performed at four pitch times in the horizontal direction using a triple nozzle.

[Method for forming second and subsequent printed portions]
Unlike the formation method of the first-layer printing portion, the formation method of the second and subsequent printing portions is a total of two dot pattern printings and drying for each printing as shown in FIG. The process of forming the printing part for a layer is repeated and the printing part after the 2nd layer is formed.

  In the first dot pattern printing, an ink jet printer ejects ink dots at a predetermined pitch in the row direction at intervals smaller than the diameter of the ink dots on the first layer printing section, and the ink dots in each row The line feed width is set so as to partially overlap the ink dots in the adjacent line. At this time, the ink dots in each row are ejected while being shifted by a half pitch in the row direction from the ink dots in the adjacent row. As a result, each ink dot partially overlaps the four surrounding ink dots, and the overlapping amount of each ink dot can be equalized. Thereafter, the first dot pattern is dried for a predetermined time.

  Thereafter, the process proceeds to the second dot pattern printing process, and the ink dots are shifted by a half pitch in the row direction so as to overlap each row of the first dot pattern, and then ejected at the same pitch as the first dot pattern. Print the dot pattern. The line feed width of the second dot pattern is the same as the line feed width of the first dot pattern. As a result, each of the ink dots in the second dot pattern partially overlaps with the surrounding four ink dots, and the undried ink dots that partially overlap each other have the surface energy minimized. Smooth and stable, minimizing surface irregularities. After printing the second dot pattern, the second dot pattern is dried for a predetermined time.

  By the steps described above, one printing portion of the second and subsequent printing portions is formed with a tact shorter than the creation time of the first layer. Therefore, the printing of the second and subsequent layers is formed by repeating the printing of the dot pattern and the drying for each printing by the number of layers of the layered printing unit to be formed.

  In addition, the formation method of the printing part after the 2nd layer is not limited to the said method, For example, as shown in FIG. 4, as a 1st time and the 2nd time dot pattern printing method, it uses a 4-unit nozzle in the vertical direction. Printing may be performed at a predetermined pitch, or printing may be performed at a predetermined pitch in the horizontal direction using a triple nozzle.

Next, the printing conditions of the first embodiment will be described.
The ink jet printing machine has an ink discharge amount of 25 pl, an interval between adjacent ink dots (dot pitch) of 50 μm (100 μm), and a waiting time between patterns (drying time) of 40 seconds.

The ink dot diameter (landing diameter) is 63 to 77 μm.
When the circuit board surface wettability was 30 °, the ink dot diameter (landing diameter) was 63 μm, and when the circuit board surface wettability was 50 °, the ink dot diameter (landing diameter) was 77 μm.

As the circuit board, a glass substrate was used, the wettability of the substrate with respect to ink was 30 to 50 °, and the substrate temperature was 60 ° C.
When the wettability of the substrate is 50 ° or more, a part of the ink aggregates, so a uniform printed portion could not be formed. However, when the wettability of the substrate is 30 °, a uniform printed portion can be formed. It was. It seems that the wettability of the base (printing part) when printing the second and subsequent printing parts is lower than 30 °.

  According to the first embodiment described above, in the step of forming the second and subsequent printing portions, 2 in the ink dot arrangement / discharge order different from the ink dot arrangement / discharge order in the first layer printing portion. Since the printed portion after the first layer is formed, the printed portion of the first layer is formed with an array of ink dots adapted to characteristics such as the wettability of the circuit board, and the printed portions after the second layer are It becomes possible to form with an arrangement of ink dots adapted to the characteristics such as the wettability of the surface of the previously formed printing part, and it is possible to quickly form a laminated printing part with few surface irregularities. Therefore, for example, if a multilayer printed resistor is formed by the method of Example 1, the width and thickness of the multilayer printed resistor can be formed uniformly, and the resistance value of the multilayer printed resistor can be easily controlled. In addition, if the wiring pattern is formed by the method of the first embodiment, the surface irregularities are reduced, so that attenuation of the high-frequency signal can be suppressed.

  By the way, if the ink dots are continuously stacked and ejected without drying the ink dots in the process of forming the second and subsequent printing portions, a smooth surface with less unevenness can be formed. Aggregates to form large ink aggregates. For this reason, when the discharge start point is located at the outer peripheral end of the printing unit, the ink aggregated at the discharge start point overflows, and the shape of the laminated printing unit tends to be non-uniform.

  In consideration of this point, in the second embodiment of the present invention, as shown in FIG. 5, in the process of printing the second and subsequent layers, the ink dots are moved in the line direction and line feed direction from the position inside the print unit. The ink is ejected in a spiral shape so as to partially overlap, and finally, the ink dots are ejected so as to partially overlap in the row direction and the line feed direction along the outer periphery of the printing portion. To print. After printing, this printing section is dried, and then the ink dots are spirally ejected from the position inside the printing section in the same arrangement and ejection order of the ink dots, and the printing section for one layer is printed and dried. The process of doing is repeated a predetermined number of times to form the laminated printing portion. The first layer printing section may be printed by the same method as in the first embodiment.

  According to the second embodiment described above, in the process of forming the second and subsequent layers, the discharge start point is inside the print unit. This can be prevented by the arrangement pattern of the ink dots, and it is possible to prevent the laminated printing portion from becoming non-uniform in shape, and the same effect as in the first embodiment can be obtained.

  In Example 2 described above, in the step of forming the second and subsequent print portions, ink dots are spirally ejected from the position inside the print portion to print one layer of the print portion. In Example 3 of the present invention, as shown in FIG. 6, in the step of forming the second and subsequent layers, after dividing the printing part into an inner area and an outer area and printing a dot pattern of the inner area, The process of printing the outer region dot pattern so as to surround the inner region dot pattern and drying it to form a printing portion for one layer is repeated.

  In the printing of the dot pattern in the inner area, the ink dots are printed so as to partially overlap in the row direction and the line feed direction from the position inside the printing unit. The ink dots may be ejected in any order.

  After printing the dot pattern in the inner region, the dot pattern in the outer region is printed so as to surround the dot pattern in the inner region without drying. The ink dots in the dot pattern in the outer area overlap each other and also overlap with the ink dots in the dot pattern in the inner area. The discharge order of the ink dots of the dot pattern in the outer region may be any order.

After the printing part for one layer is printed and dried as described above, the process of forming the printing part of the next layer by the same method is repeated to form the laminated printing part.
Also in the third embodiment described above, the same effect as in the first embodiment can be obtained.

  Example 2 (FIG. 5) is an example of continuous printing of ink dots. In Example 4 of the present invention, a step of forming the second and subsequent layers is shown in FIG. In order, the dot pattern is printed from the inner area, the dot pattern is sequentially printed on the outer area, and the dot pattern printed first is surrounded by the dot pattern to be printed thereafter. The dot pattern of each region may be continuous printing of ink dots, or may be printed collectively with a plurality of continuous nozzles.

  Also in the fourth embodiment, in the process of forming the second and subsequent printing portions, the discharge start point is an inner region of the print portion, so that the overflow of ink aggregated at the discharge start point is caused by the ink dots on the outer peripheral side. This can be prevented by the arrangement pattern, and the laminated printing portion can be prevented from becoming non-uniform in shape, and the same effect as in the first embodiment can be obtained.

  In Example 3 (FIG. 6), the dot pattern of the inner region was formed by continuous printing of ink dots in the step of forming the printing portion for the second and subsequent layers. In Example 5 of the present invention, the second layer was formed. When the dot pattern of the inner area is printed in the subsequent printing step, the dot pattern is printed from the inner area in the order indicated by the circled numbers in FIG. 8, and the dot pattern is sequentially applied to the outer area. Printing is performed so that a dot pattern printed first is surrounded by a dot pattern to be printed thereafter. The dot pattern of each region may be continuous printing of ink dots, or may be printed collectively with a plurality of continuous nozzles.

After printing the dot pattern in the inner area, the dot pattern in the outer area is printed so as to surround the dot pattern in the inner area without drying, as in the third embodiment.
After the printing part for one layer is printed and dried as described above, the process of forming the printing part of the next layer by the same method is repeated to form the laminated printing part.

In the fifth embodiment described above, the same effect as that of the first embodiment can be obtained.
In addition, the method for forming the laminated printing part of the present invention is to change the material (conductor, resistor, dielectric, etc.) included in the ink to be used, so that the laminated printing conductive pattern, the laminated printing resistor, and the laminated printing are used. The present invention can be applied to various laminated printed electrical component forming methods such as dielectrics.

Claims (6)

An ink having a predetermined electrical characteristic is ejected onto a circuit board by an ink jet method to form a first-layer printing portion composed of an array of a plurality of rows of ink dots, and then the ink is ejected onto the printing portion to form a plurality of rows. In the laminated printing method of forming the laminated printing portion by repeating the process of forming the printing portion of the next layer consisting of the arrangement of the ink dots a predetermined number of times,
In the process of forming the second and subsequent printing sections, the second and subsequent printing sections are formed with an ink dot arrangement and ejection order different from the ink dot arrangement and ejection order of the first layer printing section. A method for forming a laminated printing portion, which is characterized.   In the step of forming the second and subsequent printing portions, ink dots are ejected at a predetermined pitch in the row direction at intervals smaller than the diameter of the ink dots, and the ink dots in each row are partially separated from the adjacent ink dots. The multi-layer printing method according to claim 1, wherein a line feed width is set so as to overlap with the line feed.   3. The method for forming a multilayer printing portion according to claim 2, wherein the ink dots in each row are ejected while being shifted by a half pitch in the row direction from the ink dots in the adjacent row.   In the step of forming the second and subsequent layers, the ink dots are ejected from the position inside the printing unit so as to partially overlap in the row direction and the line feed direction, and finally along the outer periphery of the printing unit. The method of forming a multilayer printing unit according to claim 1, wherein the ink dots are ejected so as to partially overlap in the row direction and the line feed direction.   5. The step of forming the second and subsequent layers, wherein the printed portion of the first layer is dried and then the printed portion of the next layer is formed. A method for forming a laminated printing portion according to the above.   In the step of forming the first layer printing section, ink dots are ejected at a predetermined pitch in the row direction and the line feed direction at intervals smaller than the diameter of the ink dots to form a first dot pattern. After the dot pattern is dried, the ink dot is shifted by a half pitch in the row direction and is ejected at the predetermined pitch so as to overlap each row of the first dot pattern to form the second dot pattern, After drying the dot pattern, ink dots are shifted by a half pitch in the row direction between each row of the second dot pattern to form the third dot pattern by discharging at the predetermined pitch, and the third dot pattern After the ink is dried, the ink dots are shifted by half a pitch in the row direction so as to overlap each row of the third dot pattern and discharged at the predetermined pitch for the fourth time. The method of forming the multilayer printing unit according to any one of claims 1 to 5, wherein the drying to form a Ttopatan.

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