JP2006142214A - Coating method and device for insulation resin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating method and device for an insulation resin which can efficiently coat even a ceramic laminate having a complicated shape with an insulation resin at a uniform thickness. <P>SOLUTION: The coating device 1 has a holding part 121 holding the ceramic laminate 3, a nozzle head part 22 provided with a plurality of nozzles 23 discharging the insulation resin and a transfer means relatively transferring the nozzle head part 22 along a laminating direction in a state of making the nozzle head part 22 face to the side surface 30 of the ceramic laminate 3. The position and/or opening diameter of an opening part 231 of the nozzles 23 is varied according to the side surface shape of the ceramic laminate 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for applying an insulating resin to a ceramic laminate and a coating apparatus for the same in the manufacture of a multilayer piezoelectric element applied to, for example, a piezoelectric actuator.

  The laminated piezoelectric element, for example, forms a ceramic laminate formed by alternately laminating piezoelectric layers made of a piezoelectric material and conductive internal electrode layers, and provides side electrodes on the side surfaces of the ceramic laminate, The take-out electrode is joined through the external electrode material. Finally, an insulating resin is applied to the entire side surface of the ceramic laminate.

  The piezoelectric element as described above is used in a state of being housed in a housing in order to prevent the insulation resistance from being lowered by moisture and causing a functional failure. However, since a high voltage is applied to the piezoelectric element when it is driven, a short circuit occurs when the piezoelectric element comes into contact with the housing, resulting in functional failure. Therefore, as described above, the insulation between the housing and the piezoelectric element is ensured by applying the insulating resin to the entire side surface of the piezoelectric element.

Further, since the piezoelectric element is driven at a high speed and a high voltage, the temperature of the piezoelectric element itself rises due to heat generation. The piezoelectric element has a Curie point, and as the temperature approaches, the displacement characteristics and the insulation resistance of the piezoelectric element decrease, resulting in functional failure. Therefore, in order to operate the piezoelectric element normally, it is necessary to ensure heat dissipation and suppress a temperature rise.
From the above, it is required to select the thickness of the insulating resin that can ensure both the insulation between the piezoelectric element and the housing and the heat dissipation of the piezoelectric element, and to apply uniformly with the thickness.

However, the piezoelectric element has a complicated shape such as a quadrangular shape, an octagonal shape, or a barrel shape in cross section, and it is difficult to apply the insulating resin to the entire side surface of the piezoelectric element with a uniform thickness. For example, in the method of dipping a piezoelectric element into an insulating resin, the coating amount varies (see Patent Document 1). In addition, in the method of applying the entire surface using screen printing or the like, it takes a lot of time to apply the entire surface. In addition, in the method of applying using a spray, the insulating resin is diluted so that it can be sprayed and sprayed to have a low viscosity, so that it is difficult to increase the thickness.
That is, a coating method and a coating apparatus for efficiently coating an insulating resin with a uniform thickness on a piezoelectric element having a complicated shape have not been found so far.

JP 2002-203999 A

  The present invention has been made in view of such conventional problems, and even in a ceramic laminate having a complicated shape, an insulating resin coating method capable of efficiently coating an insulating resin with a uniform thickness and its coating The device is to be provided.

A first invention is a method of applying an insulating resin to an outer peripheral surface of a ceramic laminate in which piezoelectric layers made of a piezoelectric material and conductive internal electrode layers are alternately laminated.
A plurality of nozzles for discharging the insulating resin are provided, and the position or / and the opening diameter of the nozzle openings are applied using a coating apparatus having a nozzle head portion that is changed according to the side surface shape of the ceramic laminate.
The nozzle head portion is moved relative to the ceramic laminate in the laminating direction, and the coating step of discharging the insulating resin from the nozzle is changed in the circumferential relative position between the ceramic laminate and the nozzle head portion. In this method, the insulating resin is applied to the ceramic laminate.

As described above, the coating method of the insulating resin of the present invention uses a coating apparatus having a nozzle head portion having a plurality of nozzles. The position of the opening of the nozzle and / or the opening diameter is changed in accordance with the side surface shape of the ceramic laminate.
That is, according to the shape of the side surface of the ceramic laminate, the plurality of nozzles may move the positions of the openings of some nozzles back and forth from the others, and may set the diameters of the openings of some nozzles to other values. It is enlarged or reduced from the thing. By adopting such a nozzle, the discharge state of the insulating resin in the nozzle can be adjusted in advance so that the final coating amount is uniform. Therefore, by applying the insulating resin using the coating apparatus, the insulating resin can be applied with a substantially uniform thickness even in the ceramic laminate having a complicated shape.

Moreover, the said application | coating process discharges the said insulating resin from the said nozzle while moving the said nozzle head part along the lamination direction of the said ceramic laminated body.
Therefore, the insulating resin discharged from the nozzle can be efficiently and continuously applied along the stacking direction of the ceramic laminate.

  Thus, according to the coating method of the insulating resin of the present invention, the insulating resin can be efficiently coated with a uniform thickness even in a ceramic laminate having a complicated shape.

A second invention is a method of applying an insulating resin to an outer peripheral surface of a ceramic laminate in which piezoelectric layers made of a piezoelectric material and conductive internal electrode layers are alternately laminated.
One or a plurality of nozzles for discharging the insulating resin, and a spatula member for extending the discharged insulating resin flatly, the position of the tip of the spatula member is a distance from the side surface of the ceramic laminate Using a coating apparatus having a nozzle head portion provided in a shape that is substantially constant,
The nozzle head portion is moved relative to the ceramic laminate in the laminating direction, and the coating step of discharging the insulating resin from the nozzle is changed in the circumferential relative position between the ceramic laminate and the nozzle head portion. In this method, the insulating resin is applied to the ceramic laminate.

As described above, the coating method of the insulating resin of the present invention uses a coating apparatus having a nozzle head portion including one or a plurality of nozzles and a spatula member. And the position of the front-end | tip part of the said spatula member is provided in the shape from which the distance with the side surface of the said ceramic laminated body becomes substantially constant.
That is, the spatula member is provided in advance so that the discharged insulating resin can be extended flat on the side surface of the ceramic laminate while maintaining a constant distance from the side surface of the ceramic laminate. Yes. Therefore, by applying the insulating resin using the coating apparatus, the insulating resin can be applied with a uniform thickness even in the ceramic laminate having a complicated shape.

Moreover, the said application | coating process discharges the said insulating resin from the said nozzle while moving the said nozzle head part along the lamination direction of the said ceramic laminated body.
Therefore, the insulating resin discharged from the nozzle can be efficiently and continuously applied along the stacking direction of the ceramic laminate.

  Thus, according to the coating method of the insulating resin of the present invention, the insulating resin can be efficiently coated with a uniform thickness even in a ceramic laminate having a complicated shape.

A third invention is a coating apparatus for applying an insulating resin to the outer peripheral surface of a ceramic laminate in which piezoelectric layers made of a piezoelectric material and conductive internal electrode layers are alternately laminated.
A holding unit for holding the ceramic laminate;
A nozzle head portion having a plurality of nozzles for discharging the insulating resin;
Moving means for relatively moving the nozzle head portion along the laminating direction in a state of facing the side surface of the ceramic laminate,
The position of the opening of the nozzle and / or the opening diameter is changed in accordance with the shape of the side surface of the ceramic laminate, and the insulating resin coating device is applied to the ceramic laminate (claim). 9).

As described above, the insulating resin coating apparatus of the present invention includes at least a holding portion, a nozzle head portion, and a moving means. The nozzle head portion includes the plurality of nozzles, and the position and / or opening diameter of the opening of the nozzle is changed according to the side surface shape of the ceramic laminate.
That is, according to the shape of the side surface of the ceramic laminate, the plurality of nozzles may move the positions of the openings of some nozzles back and forth from the others, and may set the diameters of the openings of some nozzles to other values. It is enlarged or reduced from the thing. By adopting such a nozzle, the discharge state of the insulating resin in the nozzle can be adjusted in advance so that the final coating amount is uniform. Therefore, the said coating device can apply | coat the said insulating resin with a substantially uniform thickness also with respect to the said ceramic laminated body which has a complicated shape.

Moreover, the said moving means can be relatively moved along a lamination direction in the state which faced the said nozzle head part to the side surface of the said ceramic laminated body.
Therefore, the said coating device can apply | coat the said insulating resin discharged from the said nozzle efficiently and continuously along the lamination direction of the said ceramic laminated body.

  Thus, according to the present invention, it is possible to provide an insulating resin coating apparatus capable of efficiently applying an insulating resin with a uniform thickness even in a ceramic laminate having a complicated shape.

A fourth invention is a coating apparatus for applying an insulating resin to an outer peripheral surface of a ceramic laminate in which piezoelectric layers made of a piezoelectric material and conductive internal electrode layers are alternately laminated.
A holding unit for holding the ceramic laminate;
A nozzle head portion comprising one or more nozzles for discharging the insulating resin, and a spatula member for extending the discharged insulating resin flatly;
Moving means for relatively moving the nozzle head portion along the laminating direction in a state of facing the side surface of the ceramic laminate,
And the position of the front-end | tip part of the said spatula member exists in the application | coating apparatus of the insulating resin to the ceramic laminated body characterized by providing in the shape from which the distance with the side surface of the said ceramic laminated body becomes substantially constant ( Claim 11).

As described above, the insulating resin coating apparatus of the present invention includes at least a holding portion, a nozzle head portion, and a moving means. The nozzle head part includes the one or more nozzles and the spatula member, and the tip part of the spatula part has a shape in which the distance from the side surface of the ceramic laminate is substantially constant. Is provided.
That is, the spatula member is provided in advance so that the discharged insulating resin can be extended flat on the side surface of the ceramic laminate while maintaining a constant distance from the side surface of the ceramic laminate. Yes. Therefore, the said coating device can apply | coat the said insulating resin with uniform thickness also with respect to the said ceramic laminated body which has a complicated shape.

Moreover, the said moving means can be relatively moved along a lamination direction in the state which faced the said nozzle head part to the side surface of the said ceramic laminated body.
Therefore, the said coating device can apply | coat the said insulating resin discharged from the said nozzle efficiently and continuously along the lamination direction of the said ceramic laminated body.

  Thus, according to the present invention, it is possible to provide an insulating resin coating apparatus capable of efficiently applying an insulating resin with a uniform thickness even in a ceramic laminate having a complicated shape.

  In the first invention, the nozzle head portion includes a spatula member for flatly extending the discharged insulating resin, and a position of a tip portion of the spatula member is a distance from a side surface of the ceramic laminate. Is preferably provided in a substantially constant shape (claim 2). In this case, the spatula member can extend the discharged insulating resin flatly on the side surface while maintaining a constant distance from the side surface. Therefore, the insulating resin can be applied with a more uniform thickness in combination with the effect of changing the position and opening diameter of the opening of the nozzle according to the side surface shape.

  In the second invention, it is preferable that the number of the nozzles is plural, and the position or / and the opening diameter of the nozzles are changed in accordance with the shape of the side surface of the ceramic laminate. In this case, according to the shape of the side surface of the ceramic laminate, the plurality of nozzles may cause the positions of the openings of some nozzles to be more or less than the others, or the opening diameters of the openings of some nozzles. Is enlarged or reduced than others. By adopting such a nozzle, the discharge state of the insulating resin in the nozzle can be adjusted in advance so that the final coating amount is uniform. Therefore, the insulating resin can be applied with a more uniform thickness in combination with the effect of providing the position of the tip of the spatula member in a shape in which the distance from the side surface is substantially constant.

  In the first and second inventions, the plurality of nozzles are configured such that the opening diameter of the opening is the same and the distance between the opening and the side surface of the ceramic laminate is substantially constant. (Claim 5). In this case, variation in the coating amount of the insulating resin can be further suppressed, and a more uniform thickness can be realized.

  The plurality of nozzles are configured such that the positions of the openings are arranged substantially in a straight line, and the opening diameter increases as the distance between the opening and the side surface of the ceramic laminate increases. (Claim 6). In this case, the discharge state of the insulating resin in the nozzle can be adjusted by the distance between the opening and the side surface of the ceramic laminate. Therefore, variation in the coating amount of the insulating resin can be suppressed and a uniform thickness can be realized.

  The nozzle is preferably configured integrally with the spatula member. In this case, while discharging the said insulating resin from the said nozzle, this insulating resin can be apply | coated to the side surface of the said ceramic laminated body, extending flatly with the said spatula member. Therefore, the insulating resin can be efficiently applied.

  The opening of the nozzle is preferably provided at a position retracted from the tip of the spatula member. In this case, the insulating resin discharged from the nozzle can be first supplied onto the surface of the spatula member, supplied from the spatula member to the side surface of the ceramic laminate, and then applied to the flat surface. . Therefore, variation in the application amount of the insulating resin can be further suppressed.

  Also in the third invention, the nozzle head portion includes a spatula member for extending the discharged insulating resin flatly, and the position of the tip of the spatula member is in contact with the side surface of the ceramic laminate. It is preferable that the distance is provided in a substantially constant shape (claim 10).

  Also in the fourth invention, it is preferable that there are a plurality of the nozzles, and the positions and / or opening diameters of the nozzle openings are changed in accordance with the side surface shape of the ceramic laminate (claim 12). .

Also in the third and fourth inventions, the plurality of nozzles are configured such that the opening diameter of the opening is the same, and the distance between the opening and the side surface of the ceramic laminate is substantially constant. (Claim 13).
The plurality of nozzles are configured such that the positions of the openings are arranged substantially in a straight line, and the opening diameter increases as the distance between the opening and the side surface of the ceramic laminate increases. (Claim 14).

The nozzle is preferably configured integrally with the spatula (claim 15).
The opening of the nozzle is preferably provided at a position retracted from the tip of the spatula member.

Example 1
An insulating resin coating method and coating apparatus according to an embodiment of the present invention will be described.
First, a coating apparatus used for coating an insulating resin will be described with reference to FIGS.
As shown in FIGS. 1 to 3, the insulating resin coating apparatus 1 of this example is formed on the outer peripheral surface of a ceramic laminate 3 in which piezoelectric layers made of a piezoelectric material and conductive internal electrode layers are alternately laminated. It is a coating device for applying an insulating resin.

The coating apparatus 1 has a holding unit 121 that holds the ceramic laminate 3, a nozzle head unit 22 that includes a plurality of nozzles 23 that discharge insulating resin, and the nozzle head unit 22 facing the side surface 30 of the ceramic laminate 3. And moving means for relatively moving along the stacking direction.
The position and / or opening diameter of the opening 231 of the nozzle 23 is changed in accordance with the side surface shape of the ceramic laminate 3.
This will be described in detail below.

  As shown in FIG. 1, the coating apparatus 1 is provided with a gantry 11, and the gantry 11 is provided with a Y-axis table 12 configured to be movable on a rail 111 provided in the Y-axis direction. . In this example, the Y-axis table 12 serves as a moving unit that relatively moves the nozzle head portion 22 along the stacking direction with the nozzle head portion 22 facing the side surface 30 of the ceramic stack 3.

  Further, as shown in the figure, the Y-axis table 12 is provided with a holding portion 121 for holding the ceramic laminate 3 to which the insulating resin is applied. A spring 122 is attached to both ends of the holding portion 121, and a fixture 123 is provided at the tip of the spring 122. The holding part 122 is configured to sandwich the ceramic laminate 3 between the fixtures 123 and be fixed by the urging force of the spring 122.

  Further, as shown in the figure, a support portion 13 is attached to the gantry 11. The support portion 13 is provided with an X-axis movable portion 14 configured to be movable on a rail 131 provided in the X-axis direction. Further, the X-axis movable part 14 is provided with a Z-axis movable part 15 configured to be movable on a rail 141 provided in the Z-axis direction. In addition, the material supply device 2 is attached to the Z-axis movable unit 15.

  As shown in the figure, the material supply device 2 is connected to the dispenser 16 via a pipe 160, and the dispenser 16 is connected to the air supply source 17 via a pipe 170. The dispenser 16 can store air supplied from the air supply source 17 through the pipe 170, and can supply air to the material supply apparatus 2 through the pipe 160. In addition, the dispenser 16 is provided with a control device 161 that can control the supply amount, supply time, and the like of air when supplying air to the material supply device 2.

Next, the material supply apparatus 2 is demonstrated using FIG. 2, FIG.
In FIG. 2, in order to clarify the shapes of the nozzle 23 and the spatula member 24 described later, the ceramic laminate 3 to which the insulating resin is applied is illustrated. The cross-sectional shape of the ceramic laminate 3 of this example is an octagon as shown in FIG.
As shown in FIGS. 2 and 3, the material supply device 2 includes a syringe 21 for storing insulating resin and a nozzle head portion 22 including a plurality of nozzles 23 for discharging insulating resin. The syringe 21 and the plurality of nozzles 23 are connected inside the nozzle head portion 22, and are configured to be able to supply the insulating resin stored in the syringe 21 to the plurality of nozzles 23.

  As shown in the figure, an opening 231 serving as an insulating resin discharge port is provided at the tip of the nozzle 23. The position and opening diameter of the opening 231 of the nozzle 23 are changed according to the side surface shape of the ceramic laminate 3. The plurality of nozzles 23 of the present example are configured such that the opening diameter of the opening 231 is the same, and the distance between the opening 231 and the side surface 30 of the ceramic laminate 3 is substantially constant.

  Further, as shown in the figure, the nozzle head portion 22 is provided with a spatula member 24 for extending the insulating resin discharged from the nozzle 23 flatly. The position of the tip 241 of the spatula member 24 is provided in advance in a shape in which the distance from the side surface 30 of the ceramic laminate 3 is substantially constant. Moreover, since the spatula member 24 is fixed by the stay member 25 and the screw 26 via the nozzle 23, the nozzle 23 and the spatula member 24 are integrally formed. The opening 231 of the nozzle 23 is provided at a position retracted from the tip 241 of the spatula member 24.

Next, the dimensions of the nozzle 23, the spatula member 24, and other parts will be described with reference to FIG.
The opening diameter of the nozzle 23 means the inner diameter of the nozzle 23. In FIG. 2, the dimension a is shown as the opening diameter for convenience. As shown in FIG. 2, the opening diameter “a” determines an optimum diameter according to the viscosity of the insulating resin to be discharged. The total width b of the nozzle 23 is 0.8 to 2 times the diameter of the cross section of the ceramic laminate 3. The number of nozzles 23 is determined based on the relationship between the diameter a of the nozzles 23 and the full width b. The width c of the spatula member 24 is 1.5 to 4 times the diameter of the cross section of the ceramic laminate 3.
In this example, the diameter a of the nozzle 23 is 0.7 mm, the full width b is 10 mm, and the number of nozzles 23 is seven. The width c of the spatula member 24 is 18 mm.

Further, as shown in the figure, the buffer d, which is the receding length of the opening 231 of the nozzle 23, is 1 to 20 times the coating thickness of the insulating resin, the tip 241 of the spatula member 24, and the side surface 30 of the ceramic laminate 3. The gap e, which is the distance between the first and second layers, is 1 to 1.5 times the coating thickness.
In this example, the buffer d is 1 mm and the gap e is 0.1 mm.

Next, a method for applying the insulating resin will be described with reference to FIGS.
As shown in FIGS. 4 and 5, the insulating resin coating method of this example uses the coating apparatus 1 to relatively move the nozzle head portion 22 along the laminating direction of the ceramic laminate 3 and from the nozzle 23 to the insulating resin. 4 is performed a plurality of times by changing the circumferential relative position between the ceramic laminate 3 and the nozzle head portion 22.
This will be described in detail below.

First, preparation for carrying out the coating process is performed.
The ceramic laminate 3 to which the insulating resin 4 is applied is formed by alternately laminating piezoelectric layers made of piezoelectric materials and conductive internal electrode layers. Moreover, the side electrode 30 is provided in the side surface 30 of the ceramic laminated body 3, and a pair of extraction electrode is joined to the side electrode via the external electrode material (not shown). Further, the displacement transmitting member 31 is joined to one end face of the ceramic laminate 3 in the laminating direction, and the block member 32 is joined to the other end face. Further, a base 33 is attached to the end of the block member 32 (FIGS. 4 and 5).

Next, as shown in FIG. 4, in the holding portion 121 of the Y-axis table 12, the ceramic laminate 3 is sandwiched between the fixtures 123 provided at the tip of the spring 122 and fixed by the urging force of the spring 122. Thereby, the ceramic laminate 3 is held in the holding portion 121.
As shown in the figure, the opening 231 of the nozzle 23 is on the application start position P1 of the ceramic laminate 3, and the distance between the tip 241 of the spatula member 24 and the side surface 30 of the ceramic laminate 3 is constant. Thus, the Y-axis table 12, the X-axis movable unit 14, and the Z-axis movable unit 15 are moved relative to each other, and the positions of the material supply device 2 and the ceramic laminate 3 are determined.
The syringe 21 of the material supply device 2 is filled with the insulating resin 4. In this example, silicone is used as the insulating resin 4. As the insulating resin 4, in addition to the above, various resins such as epoxy, urethane, and imide can be used.

Next, an application process is performed.
First, the air stored in the dispenser 16 is supplied into the syringe 21 of the material supply device 2. Thereby, the insulating resin 4 filled in the syringe 21 is discharged from the opening 231 of the nozzle 23 by the pressure of the supplied air and supplied onto the surface of the spatula member 24. Supplied on the side 30.

Here, as shown in FIG. 5, simultaneously with the supply of the insulating resin 4 to the application start position P1, the Y-axis table 12 is moved in the direction in which the support portion 13 is disposed. At this time, the position of the nozzle head portion 22 remains fixed.
As the Y-axis table 12 moves, the nozzle head unit 22 relatively moves along the stacking direction of the ceramic laminate 3 and discharges the insulating resin 4 from the nozzles 23. As a result, the discharged insulating resin 4 is applied along the stacking direction of the ceramic laminate 3. Furthermore, since the nozzle 23 of this example is configured integrally with the spatula member 24, the insulating resin 4 discharged from the nozzle 23 is supplied to the side surface 30 of the ceramic laminate 3, and also by the spatula member 24. It is applied while being flattened.

Then, when the nozzle 23 reaches the application end position P2, the discharge of the insulating resin 4 from the nozzle 23 ends at the same time or before reaching the application end position P2. Then, the spatula member 24 applies the insulating resin 4 to the application end position P2 so as to extend flatly, and then the movement of the Y-axis table 12 is stopped.
Thus, one application process is completed.

Next, the circumferential relative position between the ceramic laminate 3 and the nozzle head portion 22 is changed so that the side surface 30 of the ceramic laminate 3 that has not been applied faces the nozzle head portion 22. And the application | coating process is implemented similarly to the above. In this way, the application process is repeated a plurality of times until the insulating resin 4 is applied to the entire outer peripheral surface of the ceramic laminate 3.
In this example, the insulating resin 4 is applied to half of the outer peripheral surface in the first application process. And after rotating the ceramic laminated body 3 180 degrees, the application | coating process of the 2nd time is performed and the insulating resin 4 is apply | coated to the remaining half. That is, the insulating resin 4 was applied to the entire outer peripheral surface of the ceramic laminate 3 by two application processes.

Next, the effect of the insulating resin coating method and the coating apparatus of this example will be described.
The insulating resin coating apparatus 1 of this example includes a holding unit 121 that holds the ceramic laminate 3, a nozzle head unit 22 that includes a plurality of nozzles 23 that discharge the insulating resin 4, and a nozzle head unit 22. And moving means for relatively moving along the stacking direction in a state of facing the side surface 30 of the body 3.
The position or / and the opening diameter of the opening 231 of the nozzle 23 are changed in accordance with the side surface shape of the ceramic laminate 3.

  That is, in the coating apparatus 1, the plurality of nozzles 23 are arranged so that the positions of the openings 231 of some nozzles 23 are more or less than others depending on the shape of the side surface of the ceramic laminate 3. The opening diameter of the opening 231 is enlarged or reduced as compared with the others. By adopting such a nozzle 23, the discharge state of the insulating resin 4 in the nozzle 23 can be adjusted in advance so that the final application amount becomes uniform. Therefore, the coating apparatus 1 can apply the insulating resin 4 with a uniform thickness even to the ceramic laminate 3 having a complicated shape.

  In addition, the insulating resin coating method of this example includes a coating process in which the coating head 1 is used to relatively move the nozzle head portion 22 in the stacking direction of the ceramic laminate 3 and the insulating resin 4 is discharged from the nozzle 23. Then, the relative position in the circumferential direction between the ceramic laminate 3 and the nozzle head portion 22 is changed, and the process is performed a plurality of times.

  In this example, the Y-axis table as the moving means provided in the coating apparatus 1 can be relatively moved along the stacking direction with the nozzle head portion 22 facing the side surface 30 of the ceramic laminate 3. Therefore, the insulating resin 4 discharged from the nozzle 23 can be efficiently and continuously applied along the stacking direction of the ceramic laminate 3.

  Thus, by applying the insulating resin 4 using the coating apparatus 1 of this example, the insulating resin 4 can be efficiently applied with a uniform thickness even in the ceramic laminate 3 having a complicated shape.

In this example, the nozzle head portion 22 includes a spatula member 24 for flatly extending the discharged insulating resin 4, and the position of the tip portion 241 of the spatula member 24 is in contact with the side surface 30 of the ceramic laminate 3. The distance is provided in a substantially constant shape. Therefore, the insulating resin 4 can be applied with a more uniform thickness.
The plurality of nozzles 23 are configured such that the opening diameter of the opening 231 is the same, and the distance between the opening 231 and the side surface 30 of the ceramic laminate 3 is substantially constant. Therefore, it is possible to further suppress variation in the coating amount of the insulating resin 4 and to realize a more uniform thickness.

In addition, after the coating process is finished, the relative position in the circumferential direction between the ceramic laminate 3 and the nozzle head portion 22 is changed, and the side surface 30 of the ceramic laminate 3 to which the insulating resin 4 is not applied is only faced to the nozzle head portion 22. Then, the next coating process can be performed. Therefore, the coating process can be performed efficiently.
The nozzle 23 is configured integrally with the spatula member 24. Therefore, the insulating resin 4 can be applied efficiently.
The opening 231 of the nozzle 23 is provided at a position retracted from the tip 241 of the spatula member 24. Therefore, variation in the application amount of the insulating resin 4 can be suppressed.

Moreover, in this example, the spatula member 24 for extending the discharged insulating resin 4 flatly is provided, but a brush 29 may be used in place of the spatula member 24 as shown in FIG. Also in this case, the same effect as that of the coating apparatus 1 can be obtained.
Moreover, although the nozzle 23 is comprised integrally with the spatula member 24, the nozzle 23 and the spatula member 24 can also be comprised separately.

(Example 2)
This example shows the structure of the nozzle head portion 22 when the cross-sectional shape of the ceramic laminate 3 is an ellipse as shown in FIG.
The other configuration is the same as that of the first embodiment, and has the same operation and effect.

(Example 3)
In this example, as shown in FIG. 8, in the nozzle head portion 22, the positions of the openings 231 of the nozzles 23 are arranged on a substantially straight line.
Others are the same as in the first embodiment.

In this case, the distance between the opening 231 of each nozzle 23 and the side surface 30 of the ceramic laminate 3 is different, but since the spatula member 24 is provided, the insulating resin 4 discharged from the nozzle 23 is used for the spatula member 24. Then, it can be applied to the side surface 30 of the ceramic laminate 3 while being extended flatly. Therefore, a uniform thickness can be sufficiently realized.
The other functions and effects are the same as those of the first embodiment.

Example 4
In this example, as shown in FIGS. 9 and 10, in the nozzle head portion 22, the opening diameters of the opening portions 231 of the nozzles 23 are the same, and the spatula member 24 is not provided. In FIG. 9, the cross-sectional shape of the ceramic laminated body 3 is an octagon, and in FIG. 10, it is an ellipse.
As shown in the figure, each nozzle 23 is configured so that the opening diameter of the opening 231 is the same and the distance between the opening 231 and the side surface 30 of the ceramic laminate 3 is substantially constant.
Others are the same as in the first embodiment.

In this case, the accuracy of the surface of the applied insulating resin 4 is inferior to the case where the spatula member 24 is provided, but the variation in the coating amount of the insulating resin 4 is suppressed and a uniform thickness is sufficiently obtained. Can be realized.
The other functions and effects are the same as those of the first embodiment.

(Example 5)
As shown in FIG. 11, this example is an example in which the nozzle head portion 22 has a different opening diameter of the opening 231 of each nozzle 23 and does not include the spatula member 24.
As shown in the figure, each nozzle 23 is arranged such that the position of the opening 231 is substantially aligned, and the opening diameter increases as the distance between the opening 231 and the side surface 30 of the ceramic laminate 3 increases. It is configured.
Others are the same as in the first embodiment.

In this case, the accuracy of the surface of the applied insulating resin 4 is inferior compared to the case where the spatula member 24 is provided, but depending on the distance between the opening 231 and the side surface 30 of the ceramic laminate 3, Since the discharge state of the insulating resin 4 is adjusted, variation in the coating amount of the insulating resin 4 can be suppressed, and a uniform thickness can be sufficiently realized.
The other functions and effects are the same as those of the first embodiment.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing the structure of an insulating resin coating apparatus in Embodiment 1; Explanatory drawing which shows the structure of the front of the material supply apparatus in Example 1. FIG. Explanatory drawing which shows the structure of the side surface of the material supply apparatus in Example 1. FIG. Explanatory drawing which shows the state before apply | coating insulating resin in Example 1. FIG. Explanatory drawing which shows the state which has apply | coated the insulating resin in Example 1. FIG. FIG. 3 is an explanatory diagram illustrating a front structure of a nozzle head unit provided with a brush in Example 1. FIG. 6 is an explanatory diagram showing a front structure of a nozzle head portion in Embodiment 2. FIG. 6 is an explanatory diagram showing a front structure of a nozzle head portion in Embodiment 3. Explanatory drawing which shows the structure of the front of a nozzle head part in Example 4. FIG. Explanatory drawing which shows the structure of the front of a nozzle head part in Example 4. FIG. FIG. 9 is an explanatory diagram illustrating a front structure of a nozzle head portion in Embodiment 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Application | coating apparatus 121 Holding part 22 Nozzle head part 23 Nozzle 231 Opening part 24 Spatula member 3 Ceramic laminated body 30 Side surface 4 Insulating resin

Claims (16)

In a method of applying an insulating resin to the outer peripheral surface of a ceramic laminate formed by alternately laminating piezoelectric layers made of piezoelectric materials and conductive internal electrode layers,
A plurality of nozzles for discharging the insulating resin are provided, and the position or / and the opening diameter of the nozzle openings are applied using a coating apparatus having a nozzle head portion that is changed according to the side surface shape of the ceramic laminate.
The nozzle head portion is moved relative to the ceramic laminate in the laminating direction, and the coating step of discharging the insulating resin from the nozzle is changed in the circumferential relative position between the ceramic laminate and the nozzle head portion. And applying the insulating resin to the ceramic laminate, which is performed a plurality of times.   In Claim 1, the said nozzle head part is provided with the spatula member for extending the said discharged insulating resin flatly, and the position of the front-end | tip part of this spatula member is the distance with the side surface of the said ceramic laminated body. A method for applying an insulating resin to a ceramic laminate, wherein the insulating laminate is provided in a substantially constant shape. In a method of applying an insulating resin to the outer peripheral surface of a ceramic laminate formed by alternately laminating piezoelectric layers made of piezoelectric materials and conductive internal electrode layers,
One or a plurality of nozzles for discharging the insulating resin, and a spatula member for extending the discharged insulating resin flatly, the position of the tip of the spatula member is a distance from the side surface of the ceramic laminate Using a coating apparatus having a nozzle head portion provided in a shape that is substantially constant,
The nozzle head portion is moved relative to the ceramic laminate in the laminating direction, and the coating step of discharging the insulating resin from the nozzle is changed in the circumferential relative position between the ceramic laminate and the nozzle head portion. And applying the insulating resin to the ceramic laminate, which is performed a plurality of times.   4. The ceramic laminate according to claim 3, wherein the number of the nozzles is plural, and the position or / and the opening diameter of the nozzle openings are changed in accordance with the side surface shape of the ceramic laminate. Application method of insulating resin.   5. The nozzle according to claim 1, wherein the plurality of nozzles have the same opening diameter of the opening, and the distance between the opening and the side surface of the ceramic laminate is substantially constant. It is comprised so that it may become. The coating method of the insulating resin to the ceramic laminated body characterized by the above-mentioned.   5. The plurality of nozzles according to claim 1, wherein the positions of the openings are arranged substantially in a straight line, and the distance between the openings and the side surface of the ceramic laminate. A method for applying an insulating resin to a ceramic laminate, characterized in that the opening diameter increases as the length increases.   The method for applying an insulating resin to a ceramic laminate according to any one of claims 2 to 6, wherein the nozzle is configured integrally with the spatula member.   8. The method for applying an insulating resin to a ceramic laminate according to claim 7, wherein the opening of the nozzle is provided at a position retracted from the tip of the spatula member. A coating apparatus for applying an insulating resin to the outer peripheral surface of a ceramic laminate in which piezoelectric layers made of piezoelectric material and conductive internal electrode layers are alternately laminated,
A holding unit for holding the ceramic laminate;
A nozzle head portion having a plurality of nozzles for discharging the insulating resin;
Moving means for relatively moving the nozzle head portion along the laminating direction in a state of facing the side surface of the ceramic laminate,
And the position or / and opening diameter of the opening part of the said nozzle are changed according to the side surface shape of the said ceramic laminated body, The coating apparatus of the insulating resin to the ceramic laminated body characterized by the above-mentioned.   In Claim 9, the said nozzle head part is provided with the spatula member for extending the said discharged insulating resin flatly, The position of the front-end | tip part of this spatula member is the distance with the side surface of the said ceramic laminated body. An apparatus for applying an insulating resin to a ceramic laminate, which is provided in a substantially constant shape. A coating apparatus for applying an insulating resin to the outer peripheral surface of a ceramic laminate in which piezoelectric layers made of piezoelectric material and conductive internal electrode layers are alternately laminated,
A holding unit for holding the ceramic laminate;
A nozzle head portion comprising one or more nozzles for discharging the insulating resin, and a spatula member for extending the discharged insulating resin flatly;
Moving means for relatively moving the nozzle head portion along the laminating direction in a state of facing the side surface of the ceramic laminate,
And the position of the front-end | tip part of the said spatula member is provided in the shape from which the distance with the side surface of the said ceramic laminated body becomes substantially constant, The coating apparatus of the insulating resin to the ceramic laminated body characterized by the above-mentioned.   12. The ceramic laminate according to claim 11, wherein the number of the nozzles is plural, and the position or / and the opening diameter of the nozzle openings are changed according to the side surface shape of the ceramic laminate. Insulating resin applicator.   13. The nozzle according to claim 9, wherein the plurality of nozzles have the same opening diameter of the opening, and the distance between the opening and the side surface of the ceramic laminate is substantially constant. It is comprised so that it may become. The coating apparatus of the insulating resin to the ceramic laminated body characterized by the above-mentioned.   13. The nozzle according to claim 9, wherein the plurality of nozzles are arranged such that the positions of the openings are substantially aligned, and the distance between the openings and the side surface of the ceramic laminate. A device for applying an insulating resin to a ceramic laminate, characterized in that the opening diameter increases as the length increases.   The apparatus for applying an insulating resin to a ceramic laminate according to any one of claims 10 to 14, wherein the nozzle is configured integrally with the spatula member.   16. The apparatus for applying an insulating resin to a ceramic laminate according to claim 15, wherein the opening of the nozzle is provided at a position retracted from the tip of the spatula member.

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