Patent Publication Number: US-2006003633-A1

Title: Shield wire

Description:
BACKGROUND  
      The present invention relates to a technology of producing a shield wire on a circuit board and the like.  
      Various countermeasures against reducing noise generated from electronic instruments were proposed as accompanied with fast development of electronics. Fro example, a mesh-patterned conductive film is formed by an ink jet method on a glass in a building like a hospital that needs electromagnetic shielding, preventing intra precision apparatus from malfunctioning (refer to Japanese Unexamined Patent Application Publication No. 2003-318593.) Processing the end of a coaxial cable is improved (refer to Japanese Unexamined Patent Application Publication No. 8-45363.) Shield flat cables are provided avoiding cross talk, improving electrical property, and being easily manufactured (refer to Japanese Unexamined Patent Application Publication No. 2000-173355.)  
      Meanwhile, coaxial cables and shield flat cables are to connect electronic elements within an electronic instrument with holding electromagnetic shield, and their sizes are bottleneck for miniaturizing an electronic instrument.  
     SUMMARY  
      In view of the above problem, the present invention is intended to produce a shield wire by a ink jet method on a circuit board and the like used for an electronic instrument and provide an shield wire by which an countermeasure against noise is easily taken in an electronic instrument.  
      According to an aspect of the present invention, a shield wire comprises a first conductive wiring that is formed by discharging with a droplet discharging device, for passing electric current or an signal; a second conductive wiring that is formed by discharging with a droplet discharging device; and an insulating portion formed between the first conductive wiring and the second conductive wiring by discharging with a droplet discharging device.  
      According to this structure, a shield wire has a first conductive wiring that is formed by discharging with a droplet discharging device, for passing electric current or an signal; a second conductive wiring that is formed around the first wiring by discharging with a droplet discharging device; an insulating portion formed between the first conductive wiring and the second conductive wiring and electrically isolates the first wiring from the second wiring. The insulating portion forms electrical insulation between the first conductive wiring and the second conductive wiring.  
      It is preferable that a shield wire is provided with an insulating layer that is formed by discharging with a droplet discharging device, between the second conductive wiring and a discharged member that is formed by discharging with the droplet discharging device.  
      According to this structure, an insulating layer that is formed between the second conductive wiring and a conductive wiring included in a discharged member by discharging with a droplet discharging device, and electrically insulates the second wire from the conductive wiring included in a discharged member.  
      It is preferable that a shield wire is provided with a discharged member, which is a circuit board.  
      According to the structure, the shield wire connects electronic elements together, which are mounted on the discharged member.  
      It is preferable that a shield wire is provided with a discharged member which is a container of an electronic instrument.  
      According to the structure, the shield wire connects circuit boards together, which are mounted on the discharged member.  
      It is preferable that a shield wire has a discharged member that is an electronic element.  
      According to the structure, a shield wire can connect other portion on the circuit board over electronic elements, which are mounted on the discharged member since a discharged member is an electronic element.  
      It is preferable that a shield wire has a plurality of insulating portions formed between the first conductive wirings and the second conductive wirings.  
      According to the structure, the second conductive wiring encompasses a plurality of insulating portions corresponding to a plurality of the first conductive wirings and the first conductive wirings so as to electrically connect a plurality of wirings.  
      It is preferable that a shield wire is provided with a second conductive wiring, which is electrically grounded.  
      Electrical noise due to current and signal passing through the first conductive wiring within the second conductive wiring can be shielded since the second conductive wiring is electrically grounded.  
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
      The invention is described with reference to the accompanying drawings, wherein like numbers reference like elements, and wherein:  
       FIG. 1  is a perspective view of a droplet discharging device  1 ,  
       FIG. 2A  is a sectional perspective view of a droplet discharging head  51 ,  
       FIG. 2B  is a detail sectional view of discharging portion,  
       FIG. 3A  is a partial plane view of a shield wire installed in a circuit board,  
       FIG. 3B  is a partial cross sectional view of a shield wire installed in a circuit board or a container of an electronic instrument,  
       FIG. 4  is a partial enlarging view of the shield wire  30  in the embodiment 2,  
       FIG. 5  is a perspective view of installing the shield wire  30  in a container of an electronic device,  
       FIG. 6A  is a plane view of electronic elements mounted on the circuit board  10 A in the embodiment 4, which is a discharged member of the shield wire  30  and  
       FIG. 6B  is a partial cross sectional view in the embodiment 4 
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS  
     First Embodiment  
      A first embodiment of the invention will now be described with reference to the accompanying drawings.  
       FIG. 1  is a perspective view of a droplet discharging device  1 . In the figure, the droplet discharging device  1  comprises plurality of tanks  12  maintaining a first conductive liquid material  11   a,  an insulating liquid material  11   b,  a second conductive insulating material  11   c,  a tube  13  and a discharging scan portion  2  which supplies a first conductive liquid material  11   a,  an insulating liquid material  11   b,  and a second conductive insulating material  11   c  from the tanks  12  via the tube  13 . The discharging scan portion  2  comprises a sub carriage  50  maintaining a plurality of droplet discharge heads  51  (details are shown in  FIG. 2 ), a carriage  3  holding the sub carriage  50 , a second position control device  4  controlling a position of the carriage  3 , a stage  5  holding a circuit board  10 A on which an electronic element is mounted or an electronic element is not mounted, a first position control device  6  controlling the position of the stage  5 , a droplet discharging device control portion  7 , a maintenance device  8  and a draining device  9 . The tank  12  is connected to the plurality of droplet discharge heads  51  in the carriage  3  via the tube  13  and the tank  12  supplies a first conductive liquid material  11   a,  an insulating liquid material  11   b,  a second conductive insulating material  11   c  to each of the droplet discharge heads  51 . Details of the above materials are described later.  
      The second position control device  4  changes the relative position of the carriage  3  toward X-axis and Z-axis perpendicular to Z-axis in response to a signal from the droplet discharging device control portion  7 . Further, the second position control device  4  makes the carriage  3  rotate around the axis, which is parallel to Z-axis. In the embodiment, Z-axis is approximately parallel to vertical direction (namely the gravitational acceleration direction.) The first position control device  6  changes the relative position of the stage  5  toward Y-axis direction, which is perpendicular to X-axis and Z-axis in response to a signal from the droplet discharging device control portion  7 . Further, the first position control device  6  makes the stage  5  rotate around Z-axis. In the specification, the second position control device  4  and the first position control device  6 ″ may be referred to as “scan portion”.  
      The stage  5  has a plane, which is in parallel to both X-axis and Y-axis. The stage  5  is constituted so as to place or hold the circuit board  10 A detachable, which is coated with the first conductive liquid material  11   a,  the insulating liquid material  11   b,  and the second conductive insulating material  11   c.    
      The circuit board  10 A in the figure is an electronic circuit device having a plurality of conductive wirings. The embodiment is applied not only to an electronic circuit device in which various electronic parts are mounted, but also to only the circuit board  10 A. The wiring included in the circuit board  10 A is explained as a single layer hereafter, but the embodiment is also applied to a multi layered circuit board. Further, the first conductive liquid material  11   a,  the insulating liquid material  11   b,  and the second conductive insulating material  11   c,  which are discharged from the droplet discharging head  51 , are a liquid state directly after discharging. These materials are solidified by thermal or optical treatment after discharging, depending on a used solvent. In the specification, “form” may mean that these liquid materials are discharged by the droplet discharging head  51  so as to form a specific configuration with a predetermined thickness and solidified by thermal or optical treatment after discharging.  
      Further, X-axis direction, Y-axis direction and Z-axis direction are coincided to the direction where the relative position of any of the carriage  3  and the stage  5  is changed. Further, virtual original points of the XYZ coordinate system defining X-axis, Y-axis and Z-axis are fixed to the reference portion of the droplet discharging device  1 . In the specification, X-axis, Y-axis and Z-axis are a coordinate on the XYZ coordinate system. Here, the above virtual original points may be fixed on the stage  5  or the carriage  3 .  
      The carriage  3  and the stage  5  have a further freedom of changing relative displacements and rotations more than the above. Here, in the embodiment, the explanation of this further freedom more than the above is omitted.  
      The droplet discharging device control portion  7  is constituted so as to receive discharge data indicating the relative position for discharging the first conductive liquid material  11   a,  the insulating liquid material  11   b,  and the second conductive insulating material  11   c  from an external information processing device (not shown.)  
      In the maintenance device  8 , a unit for performing maintenance to some of drop discharging heads  51  is installed and selected by the droplet discharging device control portion  7 . The unit is stopped after changing the relative position toward Y direction corresponding to the carriage  3 . When performing maintenance to the drop discharging heads  51 , the relative position of the carriage  3  is changed along X direction on the maintenance device  8  by the second position control device  4 . A desired unit is positioned at the carriage  3  by moving the maintenance device  8  and selected so as to change the relative position. Further, the draining device  9  collects each of the first conductive liquid material  11   a,  the insulating liquid material  11   b,  and the second conductive insulating material  11   c,  which are collected by each unit of the droplet discharging device  1 .  
       FIG. 2A  is a sectional perspective view of the droplet discharge head  51  and  FIG. 2B  is detail sectional view of a discharging portion. Each of the drop discharging heads  51  is a inkjet type drop discharging head. Each of the drop discharging heads  51  is provided with an oscillation plate  126  and a nozzle plate  128 . A liquid storage  129  is placed between the oscillation plate  126  and the nozzle plate  128 . The first conductive liquid material  11   a,  the insulating liquid material  11   b,  and the second conductive insulating material  11   c  are supplied to a hole  131  from the tank  12  via the tube  13  and always filled in the liquid storage  129 . Each of liquid materials is supplied to each of different droplet discharge heads  51 .  
      A plurality of partitions  122  are placed between the oscillation plate  126  and the nozzle plate  128 . A region surrounded by the oscillation plate  126 , the nozzle plate  128  and a pair of partitions  122  is a cavity  120 . The cavity  120  is installed opposing to the nozzle  52  so that the numbers of the cavity  120  is equal to a number of the nozzle  52 . The first conductive liquid material  11   a,  the insulating liquid material  11   b,  and the second conductive insulating material  11   c  are supplied to the cavity  120  from the liquid storage  129  via a supply port  130  located between a pair of partitions  122 .  
      In the  FIG. 2B , the oscillator  124  is located opposing to the cavity  120  on the oscillation plate  126 . The oscillator  124  comprises a pair of electrodes  124   a  and  124   b  sandwiching a piezo element  124   c.  A driving voltage is applied to a pair of electrodes so that the first conductive liquid material  11   a,  the insulating liquid material  11   b,  and the second conductive insulating material  11   c  are discharged from the nozzle  52 . The configuration of the nozzle  52  is arranged so that the first conductive liquid material  11   a,  the insulating liquid material  11   b,  and the second conductive insulating material  11   c  are discharged to Z-axis from the nozzle  52 .  
      In this specification, the first conductive liquid material  11   a,  the insulating liquid material  11   b,  and the second conductive insulating material  11   c  are defined as a material having a viscosity to the level of being discharged from the nozzle. Such material is either aqueous or oiliness. If the material has sufficient flowability for being charged from the nozzle, it may include some solid material. Details are described later.  
      In the specification, a discharging portion  127  may be defined as a part including one nozzle  52 , the cavity  120  corresponding to the nozzle  52 , and the oscillator  124  corresponding to the cavity  120 . According to this definition, a single of the droplet discharging heads  51  has the discharging portion  127  of which numbers are equal to the numbers of the nozzle  52 . The discharging portion  127  may comprise electro-thermal conversion element instead of piezo element. Namely, the discharging portion  127  may be structured so as to discharge a material by using thermal expansion of a material with an electro-thermal conversion element.  
       FIG. 3A  is a partial plane view of a shield wire installed in a circuit board.  FIG. 3B  is a partial cross sectional view of a shield wire installed in a circuit board or a container of an electronic instrument. In the embodiment, the discharged member is the circuit board, buy it may be or a container of an electronic instrument. Conductive patterns  20   a  to  20   j  are installed as an electrical wiring on the circuit board  10 A and IC package  26  is mounted in the center of it. The tank  12  in the droplet discharging device  1  (shown in  FIG. 1 ) stores a plurality of liquid materials. The insulating liquid material  11   b  is selected from them and discharged on the circuit board  10 A as a discharged member. The insulation layer  21  is formed on a appropriate area of the conductive patterns  20   a  to  20   j.    
      The insulating liquid material  11   b  is selected from SiO 2 , SiN,Si 3 N 4 , polyamide resin, polyester resin, phenol resin, fluorine resin, UV ray cured resin and visual light cured resin after thermal and/or optical processing so as to insure adhesiveness to the circuit board  10 A or conductive patterns  20   a  to  20   j.  Further, the insulating liquid material  11   b  is not limited to these materials, but any materials insuring electric insulation. Viscosity of the insulating liquid material  11   b,  a dispersion medium or a solvent for it, concentration of dispersion, and a material for arranging surface tension are the same of them for the second conductive liquid material  11   c  described later. When an insulating coat  22  is already formed on the conductive patterns  20   a  to  20   j,  the insulation layer  21  is omitted.  
      Next, the second conductive liquid material  11   c  is selected from a plurality of liquid materials stored in the tank  12  of the droplet discharging device  1  by the droplet discharging device  1 . The second conductive liquid material  11   c,  which contains at least conductive fine particles or organic metal compounds is discharged as a predetermined configuration on a predetermined location of the circuit board  10 A so as to be a second conductive wiring  25   a.  The second conductive liquid material  11   c,  which contains at least conductive fine particles or organic metal compounds, comprises a dispersion liquid where conductive fine particles are dispersed, a liquid organic metal compound, a solution of it or mixture of them. Conductive fine particles are selected from a metal particles such as gold, silver, tin, palladium, nickel or conductive polymer or super conductive material.  
      An organic material may be coated over the surface of these conductive fine particles in order to improve dispersion. A coating material for coating the surface of these conductive fine particles is selected from organic solvent such as xylene, toluene and citric acid. The size of a conductive fine particle is favorably more than 1 nm and under 0.1 micron. If the size is more than 0.1 micron, the particles are frequently stopped at the nozzle of a droplet discharging heads of the inkjet droplet discharging device and not discharged easily. Further, when the size is less than 1 nm, the volume ratio of coating material to the conductive fine particles becomes large and the ratio of organic material become large.  
      Organic metal compounds are a compound and an aqua complex including gold, silver and palladium. Metals within them are revealed by thermal decomposition. In detail, chloro triethyl phosphine gold (I), chloro trimethyl phosphine gold (I), chloro triphenyl phosphine gold (I),silver(I)2,4-pentanedionato aqua complex, trimethyl phosphine(hexafluoro acetyl ATA)silver(I) aqua complex, and cupper (I) hexafluoro pentanedionato cycloocta diene aqua complex are cited.  
      Vapor pressure of dispersion medium or solvent including at least conductive fine particles or organic metal compound at room temperature is favorably more than 0.001 mmHg and less than 200 mmHg (more than 0.133 Pa less than 26600 Pa.) If vapor pressure is higher than 200 mmHg, a dispersion medium or a solvent is suddenly evaporated making a liquid difficult deposited as a favorite film. Further, vapor pressure of dispersion medium or solvent is favorably more than 0.001 mmHg less than 50 mmHg (more than 0.133 Pa less than 6650 Pa). If vapor pressure is higher than 50 mmHg, the particles are frequently stopped due to drying at the nozzle of a droplet discharging heads of the inkjet droplet discharging device and not discharged stably. On the other hand, when vapor pressure of dispersion medium and/or solvent at room temperature is less than 0.001 mmHg, drying is delayed so that dispersion medium and/or solvent are easily hold, and it is not easy to obtain high quality conductive layers after the post process such as thermal or optical processing.  
      A dispersion medium is not specifically limited if it can disperse the conductive fine particles and does not make particles aggregate. A solvent is not specifically limited if it can dissolve the organic metal compound. Such dispersion medium and/or solvents are water, alcohol such as methanol, ethanol, propanol, butanol, carbon hydride compound such as n-heptanes, n-octane, decane, toluene, xylene, cymene durren, inden, dipenten, tetrahydro naphthalene, decahydro naphthalene and cyclohexyl benzen and eter compound such as ethleneglycol dimethyl eter, ethleneglycol diethyl eter, ethleneglycol methyl ethyl eter, diethleneglycol dimethyl ethyl eter, diethleneglycol diethyl eter, diethleneglycol methyl ethyl eter, 1,2-di methoxy ethane, bis (2-methoxy ethyl) eter, and p-dioxane and a polar compound such as propylene carbonate, γ butyrolactone, N-methyl-2 pyrrolidone, dimethyl formamide, dimethyl sulfoxide, cyclo exanoate. Further, polyamide resin, epoxy resin, polyester resin, phenol resin, fluorine resin, UV cured resin, and visible light resin are cited. Water, alcohol, carbon hydride compound and eter compound among them are favorite in view of dispersion of fine particles, stable solution, easy soluble organic metal, appropriateness for applying to a droplet discharging method. Water and carbon hydride compound are further favorite as a dispersion medium or solvent. These dispersion medium or solvents are used independently or as a mixture of more than two kinds.  
      A dispersion concentration for dispersing the conductive fine particles into dispersion medium is favorably more than 1 weight % less than 80 weight %, can be adjusted depending on desired thickness of a conductive layer. When it is over 80 weight %, the conductive fine particles easily aggregate, making a film difficult being uniform. As the same reason, solute concentration for the organic metal solution is favorably the same range of the dispersion concentration. The surface tension of the second conductive liquid material  11   c,  which includes at least the arranged conductive fine particles or the organic metal compound, is favorably more than 0.02 N/m and less than 0.07 N/m. When the second conductive liquid material  11   c  is discharged by a droplet discharging method and the surface tension is less than 0.02 N/m, a droplet of the liquid easily veeringly flies from the nozzle to the circuit board  10 A because of the increase of wettability of ink compound to the nozzle surface. When the surface tension is more than 0.07 N/m, ink configuration due to the surface tension at the nozzle tip is not stable, making the discharging amount and timing control of discharging difficult.  
      In order to arrange the surface tension, materials for arranging the surface tension such as fluorine, silicon, nonion groups may be added to a liquid material so as to avoid decreasing contact angle with the surface of the circuit board  10 A. A nonion group material for arranging the surface tension improves the wettability of the liquid material toward the circuit board and the leveling property of the film, and prevents the coated film from having of uneven surface like an orange peel (including small dints on a surface.)  
      The viscosity of the liquid material is favorably more than 1 mPa·s and less than 50·m·Pa·s. When the viscosity is over 1 mPa·s, it is uneasy that the circumference of the nozzle  52  is contaminated by the flow of the liquid material at the time of discharging the droplet  11  of the liquid material (shown in  FIG. 2 .) Meanwhile, when the viscosity is less than 50·mPa·s, the droplet is not easily stopped at the nozzle  52  so as to attain smooth discharging.  
      Further, when the insulation coat  22  is covered over the circuit board  10 A, the kind of the solvent for the second conductive liquid material  11   c  is the same material for insulation coat  22 , attaining favorite adhesiveness toward the insulation coat  22 . The second conductive liquid material  11   c  is discharged and formed by the discharging droplet device  1 , so that the second conductive wiring  25   a  is formed as a favorite conductive film after thermal and/or optical treatment.  
      Next, the insulating liquid material  11   b  is selected from a plurality of liquid materials stored in the tank  12  in the droplet discharging device  1  (shown in  FIG. 1 ) and the insulation portion  23   a  is discharged and formed. The material for it may be the same of the insulation layer  21  or different. The insulation layer  21  may certainly assures the adhesiveness of the circuit board  10 A toward conductive patterns  20   a  to  20   j  and the second conductive wiring  25   a.  The insulation liquid material  11   b  discharged from the droplet discharging device  1  as the insulation portion  23  may certainly assure the adhesiveness with the second conductive wiring  25   a  and electrical insulation.  
      Next, the first conductive liquid material  11   a  is selected from a plurality of liquid materials stored in the tank  12  in the droplet discharging device  1  (shown in  FIG. 1 ), discharged and formed on the insulating portion  23  so as to form the first conductive wiring  24 . The material for the first conductive liquid  11   a  may be the same of the second conductive liquid material  11   c  or different. The first conductive wiring  24  is connected to the conductive patterns located on the circuit board  10 A and passes electric current. Hence, the first conductive wiring  24  has favorably superior conductivity.  
      Next, the insulation liquid material  11   b  is selected from a plurality of liquid materials stored in the tank  12  in the droplet discharging device  1  (shown in  FIG. 1 ), discharged and formed at least on a region including the insulating portion  23   a  and the first conductive wiring  24  so as to form the insulating portion  23   b.  Hence, the other direction of the first conductive wiring  24  except both ends of long direction of it is encompassed by the insulation portions  23   a  and  23   b.  Namely, the first conductive wiring  24  is electrically insulated from the second conductive wiring  25   a  by the insulation portions  23   a  and  23   b.    
      Next, the second conductive liquid material  11   c  is selected from a plurality of liquid materials stored in the tank  12  in the droplet discharging device  1  (shown in  FIG. 1 ), discharged and formed at least on a region including the insulating portions  23   a  and  23   b  and the second conductive wiring  25   a  so as to form the second conductive wiring  25   b.  Hence, the insulating portion  23   a  and  23   b  is encompassed by the second conductive wirings  25   a  and  25   b.  The other direction of the insulating portions  23   a  and  23   b  except both ends of long direction of it is encompassed by the second conductive wirings  25   a  and  25   b.  Namely, the insulation portions  23   a  and  23   b  are sandwiched by the first conductive wiring  24  and the second conductive wirings  25   a  and  25   b.  The first conductive wiring  24  is electrically insulated from the second conductive wirings  25   a  and  25   b  by the insulation portions  23   a  and  23   b  to be the shield wire  30 .  
       FIG. 3B  shows the connection of conductive patterns  20   e  to  20   j  to the shield wire  30 . The insulation coat  22  is not formed over the conductive patterns  20   a  to  20   j.  Here, when the shield wire  30  is formed between the conductive pattern  20   e  and  20   j,  the conductive pattern is electrically short circuited because of electrical conductivity of the second conductive wiring  25   a.  In order to avoid the short circuit, the insulation layer  21  is formed at least in an area where the shield wire  30  is overlapped with conductive patterns. The insulation layer  21  may not be formed, when the conductive pattern is not short circuited with the conductive wiring  25   a  because of the insulating coat  22 .  
      At the electrical connections  24   a  and  24   b  between the shield wire  30  and conductive patterns  20   e  to  20   j,  the insulation layer  21  is not formed and the first conductive wiring  24  is electrically connected to the conductive patterns  20   j  and  20   e.  The second conductive wirings  25   a  and  25   b  are installed within a region of the insulating layer  21  at the both ends of the shield wire  30  so as to avoid electrical short circuit to the first conductive wiring  24 . The second conductive wirings  25   a  and  25   b  are connected to the conductive pattern  20   f,  which is the electrical ground of the circuit board  10 A at the connection  24   c.  Thus, the second conductive wirings  25   a  and  25   b  are electrically grounded.  
      An advantage of the embodiment 1 is the following: Various kinds of noises are generated by signals ands current passing through the first conductive wiring  24 . In the present embodiment, in order to prevent electronic devices from such noise, the first conductive wiring  24  is encompassed by the insulating portions  23   a  and  23   b  and the circumference of it is also encompassed by the second conductive wirings  25   a  and  25   b.  Further, the second conductive wirings  25   a  and  25   b  are grounded by the connection  24   c.  Therefore, the embodiment provides a shield wire, which can give the countermeasure against noise caused by the wiring in an electronic instrument.  
     Second Embodiment  
      A second embodiment of the invention will now be described with reference to the accompanying drawings. Here, only a portion and a part that are different from the embodiment 1 can be described.  
       FIG. 4  is a cross sectional view of enlarged part of the shield wire  30 . In the embodiment, a plurality of the first conductive wirings  24  are installed between the second conductive wirings  25   a  and  25   b.  The insulating liquid material  11   b  is discharged on an area where insulation is necessary among conductive patterns  20   a  to  20   j  formed on the circuit board  10 A. Then, the insulation layer  21  is formed. The second conductive liquid material  11   c  is discharged on the insulation layer  21  by the droplet discharging device  1 . Then, the second conductive wiring  25   a  is formed. In this case, the width of the second conductive wiring  25   a  is equal to the size of installing four of the first conductive wirings  24 .  
      Next, the insulating liquid material  11   b  is discharged on the second conductive wiring  25   a  by the droplet discharging device  1 . Then, the insulation portion  23  is formed. It is installed corresponding to the first conductive wiring  24  which is described later. The insulation portions  23   a  may have different widths. They also may have different pitches.  
      Next, the first conductive liquid material  11   a  is discharged by the droplet discharging device  1 . Then, four of the first conductive wirings  24  are formed. Further, four of the insulating portions  23   b  are installed corresponding to the four of the first conductive wirings  24 . Here, it is important that the insulation portion  23  does not contact with the adjacent insulating portion  23 . If the insulation portion  23   b  contacts with the adjacent one, it becomes impossible that the second conductive wiring  25  encompasses the first conductive wiring  24  and does not function as shielding.  
      Next, the second conductive liquid material  11   c  is discharged encompassing all the second conductive wiring  25   a,  the insulation portions  23   a  and  23   b  and a plurality of the first conductive wiring  24 . Then, the second conductive wiring  25   b  is installed so as to form the shield wire  30  having a plurality of the first conductive wirings  24 .  
      An advantage of the embodiment 2 is the following: The second conductive wirings  25   a  and  25   b  are discharged at once, making discharging time short. If the second conductive wiring  25   b  is electrically grounded at one place, the shield wire  30 , which can take noise countermeasure toward all the first conductive wirings  24 , can be provided.  
     Third Embodiment  
      A third embodiment of the invention will now be described with reference to the accompanying drawings. Here, only a portion and a part that are different from the embodiment 1 can be described.  
       FIG. 5  is a perspective view of installing the shield wire  30  in a container of an electronic device. In the embodiment, the shield wire  30  is installed in the container  27  of an electronic instrument and a part of the container  27  is used as a circuit. In the container  27  of an electronic instrument, a pair of holes (not shown) for fixing other container with a screw connects the screw cramp hole  29  provided in the metal plate  8 . Namely, the container  27  can be linked to other one by being cramped with a screw from the lower area of the container  27 . Further, other container includes electrical conductive portion facing the metal plate  28  and be electrically connected to the container  27  by being linked.  
      For example, the shield wire  30  is installed encompassing a pair of metal plate  28 . In this case, the droplet discharging head  51  (shown in  FIG. 2 ) of the droplet discharging device  31  is mounted at the end of an arm of the articulated robot. The first conductive liquid material  11   a,  the second conductive liquid material  11   c  and the insulating liquid material  11   b,  which are stored in the tank, are provided and discharged toward the vertical direction or the horizontal direction.  
      A part of the first conductive wiring  24  of the shield wire  30  is installed so as to be electrically connected to a part of a pair of metal plate  28 . When a material of the container is plastic, there is no need of the insulating layer  21  between the shield  30  and the container  27 . When a material of the container is metal, there needs the insulating layer  21  between the shield  30  and the container  27 .  
      In the embodiment, a pair of the metal plates  28  is explained, but a plurality of metal plates  28  can be prepared for installing the shield wire  30  of the embodiment inside and/or outside of the container. The connection is not limited to the metal plate  28 , can be replaced with a circuit broad for a power source and a display, transformer, a container for an electronic instrument, a memory device and operating switch. The embodiment can be applied to a means for removing electrostatic generated in a display. In this case, it is better that the insulator  21  is not installed between the shield  30  and the display. Further, the device is directly connected via the first conductive wiring  24  without installing the metal plate  28 .  
      An advantage of the embodiment 3 is the following: When a plurality of circuit boards are connected each other in the electronic instrument, the present embodiment is to provide the shield wire  30  for avoiding noise.  
     Fourth Embodiment  
      A fourth embodiment of the invention will now be described with reference to the accompanying drawings. Here, only a portion and a part that are different from the embodiment 1 can be described.  
       FIG. 6A  is a plane view of electronic elements mounted on the circuit board  10 A, which is a discharged member of the shield wire  30 .  FIG. 6B  is a partial cross sectional view of it. In this embodiment, conductive patterns as wrings of the circuit board  10 A are electrically connected each other with passing via the IC package  26  as an electronic element mounted on the circuit board  10 A. For example, when conductive patterns  20   j  to  20   e  are connected each other by the shield wire  30 , the shield wire  30  is installed in a region over the IC package  26  as an electronic element mounted on the circuit board  10 A, if there is no other space for installing it over the other conductive patterns. The shield wire  30  is formed by the discharging method disclosed in the embodiment 1. In the embodiment, the second conductive patterns  20   a  and  20   f  are installed between the conductive patterns  20   j  and  20   e  and they are short circuited with the second conductive wiring  25   a.  The insulation layer  21  is installed between the shield wire  30  and the circuit board  10 A in order to avoid the short circuit. The first conductive wiring  24  is connected to the conductive pattern  20   j  via the connection  24   a  and the conductive pattern  20   e  via the connection  24   b.  The second conductive pattern  25   b  is electrically connected to the conductive pattern  20   f,  which makes the circuit board  10 A grounded, via the connection  25   c.    
      The present embodiment can be applied to a installation for a back light and a reflector opposing the display surface of a display device, transformer and a capacitor.  
      An advantage of the embodiment 4 is the following: A space over electronic elements is used for the shield wire  30  for noise countermeasure so as to miniaturize an electronic instrument.