JP2006090622A - High voltage generating device for electric discharge ignition device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high voltage generating device for an electric discharge ignition device capable of improving productivity in comparison with a conventional one by preventing occurrence of situation that an electrode terminal can not be inserted into a through hole because of attachment of solder used in an electronic component packaging process, to a land for mounting the electrode terminal. <P>SOLUTION: The lands 20-25 for mounting the electrode terminal are composed of conductor patterns formed in a state of surrounding circumferences of central through holes 200-205 excluding prescribed notch parts 210-215. Directions of the notch parts 210-215 are aligned in the prescribed direction, and the shape of the conductor pattern is the approximate C-shape. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a high voltage generator for a discharge ignition device used in various combustion appliances such as gas combustion appliances and petroleum combustion appliances.

  In various combustion appliances such as a gas stove and a water heater, a discharge ignition device is used as an ignition source. As a discharge ignition device, a device is generally used that combines a high voltage generation device including an ignition transformer that boosts a power supply voltage to a predetermined high voltage and an ignition plug installed in the vicinity of a gas burner or the like. In such a discharge ignition device, a gas burner or the like is ignited by generating a spark from the discharge electrode of the spark plug by the secondary side voltage boosted by the ignition transformer of the high voltage generator.

  As the above-mentioned high voltage generator, an ignition transformer and a circuit unit configured by mounting electronic components on a circuit board are accommodated in a case (external housing) made of an insulating material, and a resin or the like The thing of the structure filled with the insulating mold material is known. Further, such a high voltage generator is provided with an electrode terminal for taking out a high voltage boosted by an ignition transformer.

As a manufacturing process of such a high voltage generator, a circuit unit that is preliminarily mounted with electronic components on a circuit board, an ignition transformer, and an electrode terminal are incorporated in an external housing, and the electrode terminal and the circuit unit are assembled. Is connected, and thereafter, a molding material is filled in the external housing (for example, see Patent Document 1).
International Publication No. 00/07217

  As described above, in a high voltage generator for a discharge ignition device, an electronic component is mounted on a circuit board in advance to form a circuit unit, and electrical connection between the circuit unit and the electrode terminal is performed in an external casing. It is to be done at the time of incorporation into. The electrical connection between the electrode terminal and the circuit unit is usually performed by inserting the end of the electrode terminal into a through hole provided on the circuit board and soldering it to a land formed around the through hole. .

  However, as described above, the circuit unit is subjected to a soldering process using a flow tank or the like in a process of mounting electronic components in advance. For this reason, solder in the mounting process of the electronic component may adhere to the land for attaching the electrode terminal to block the through hole, or the through hole may be narrowed, making it impossible to insert the electrode terminal into the through hole. It was. For this reason, a process such as removing the solder is required, and there is a problem in that the production efficiency is reduced.

  The present invention has been made to address such problems. The present invention can prevent a situation in which solder in an electronic component mounting process adheres to a land for attaching an electrode terminal and the electrode terminal cannot be inserted into the through hole. An object of the present invention is to provide a high-voltage generator for a discharge ignition device that can improve productivity.

(Claim 1)
A high voltage generator for a discharge ignition device according to the present invention is a high voltage generator for a discharge ignition device that generates a spark discharge by supplying a high voltage to an ignition plug and ignites fuel. An ignition transformer configured to insert a magnetic core having a primary winding wound around a central hole of a cylindrical coil bobbin, and a circuit unit in which electronic components are mounted on a circuit board. The circuit board includes a circuit unit having an electrode terminal mounting land formed of a conductor pattern formed so as to surround a through hole except for a predetermined notch, and the ignition transformer and the circuit unit. And an external housing filled with a molding material, and an electrode terminal having one end disposed outside the external housing and the other end fixed to the electrode terminal mounting land. To.

  In the high voltage generator for a discharge ignition device according to the present invention, the electrode terminal mounting land formed on the circuit board of the circuit unit is formed so as to surround the periphery of the through hole except for a predetermined notch. It consists of patterns. That is, unlike a normal land composed of an annular conductor pattern, it is composed of a conductor pattern having a shape in which a part of the conductor pattern is missing. As a result, even if a soldering process using a flow tank or the like is performed in the process of mounting the electronic component, it is possible to suppress the adhesion of the solder to the electrode terminal mounting land, and the adhesion of the electrode terminal to the through hole It is possible to prevent the occurrence of a situation where it becomes impossible to insert the.

(Claims 2, 3, and 4)
One aspect of the high voltage generator for a discharge ignition device according to the present invention is characterized in that the electrode terminal mounting land is formed in a substantially C shape. In one aspect of the high voltage generator for a discharge ignition device according to the present invention, a plurality of the electrode terminal mounting lands are provided, and the notches of the electrode terminal connecting lands are aligned in a predetermined direction. It is characterized by. In one aspect of the high voltage generator for a discharge ignition device according to the present invention, the predetermined direction is the same as a transport direction of the circuit board to a flow tank for soldering the electronic component. And Thus, for example, the electrode terminal mounting land is formed in a substantially C shape, and the opening side (notch portion) of C is the same as the circuit board transport direction to the flow tank for soldering the electronic components. And As a result, the opening side first comes into contact with the solder in the flow tank, so that it is difficult to place the solder on the other conductor pattern portion, and more reliably prevent the situation that the electrode terminal cannot be inserted into the through hole. Can do.

  According to the high voltage generator for a discharge ignition device of the present invention, a situation occurs in which solder in an electronic component mounting process adheres to a land for attaching an electrode terminal, and the electrode terminal cannot be inserted into the through hole. Therefore, it is possible to provide a high-voltage generator for a discharge ignition device that can improve productivity as compared with the prior art.

Hereinafter, modes for carrying out the present invention will be described.
1 and 2 show a main configuration of a high voltage generator for a discharge ignition device according to an embodiment of the present invention. In these drawings, reference numeral 1 denotes a high voltage generator for a discharge ignition device, and the discharge ignition device is configured by connecting the high voltage generator 1 for a discharge ignition device and an ignition plug (not shown). The discharge ignition device is used for various combustion appliances such as a gas combustion appliance such as a gas stove and a gas water heater, and an oil combustion appliance such as an oil water heater and an oil fan heater.

  A high voltage generator 1 for a discharge ignition device has an external housing 2 made of an insulating material (resin in the present embodiment). The material constituting the outer casing 2 is a resin having heat resistance, such as POM (polyoxymethylene), PBA (polybutyl acrylate), PBS (polybutadiene styrene), PBT (polybutylene terephthalate), PPS (polyphenylene). Sulfild) and the like can be used.

  In the external housing 2, an ignition transformer 3 and a circuit unit 4 in which electronic components such as a diode, a resistor, and a capacitor are mounted on a printed board are housed. As shown in FIG. 2, the circuit unit 4 includes output terminals 40 (and input terminals 61 and 62 (not shown in FIG. 2)), which will be described later, inserted from the lower side of the external housing 2. The tip is soldered and electrically connected. FIG. 2 shows a state where the circuit unit 4 and the ignition transformer 3 are separated in order to make the internal structure easy to see, but these are soldered. Although not shown, a molding material such as urethane resin is enclosed in the external housing 2.

  The ignition transformer 3 inserts a magnetic core 6 such as an iron core around which a primary coil (primary side winding) is wound into a central hole of a cylindrical coil bobbin 7 around which a secondary coil (secondary side winding) is wound. It is constituted by. A plurality of (four in the present embodiment) terminal arrangement portions 8 are formed on the side portions of the cylindrical coil bobbin 7 so as to protrude sideways, and output pins 9 as connection terminals are formed on the terminal arrangement portions 8. Has been planted. The end portions of the secondary windings are wound around these output pins 9 and soldered.

  As shown in FIGS. 1 and 2, the external housing 2 has an opening 10 on one side (upper side in the drawing), and an ignition transformer 3 is inserted through the opening 10. And the support part 11 which contact | abuts and supports the lower side of the coil bobbin 7 of the ignition transformer 3 inserted from the opening part 10 is comprised planarly. In this way, the cylindrical coil bobbin 7 is not supported by the same cylindrical support part, but is supported by the planar support part 11, so that an appropriate amount is provided between the coil bobbin 7 and the inner surface of the external housing 2. An interval can be provided. This makes it possible to easily and reliably fill the molding material made of resin or the like between the coil bobbin 7 and the inner wall of the external housing 2. Further, it is possible to prevent bubbles from being mixed into the mold material when the mold material is filled.

  As shown in FIG. 1, a curved portion 12 that matches the shape of the cylindrical coil bobbin 7 is formed on the side wall portion of the portion of the external housing 2 in which the ignition transformer 3 is accommodated. The joint portion 13 between the support portion 11 and the support portion 11 is formed substantially vertically (straight), and the cross-sectional shape thereof is a bottleneck shape.

  On the other hand, contact portions 14 are provided in the vicinity of both end portions in the longitudinal direction of the coil bobbin 7. These abutting portions 14 are formed of a plate-like body provided so as to protrude from the coil bobbin 7, the tip portion thereof is a linear shape corresponding to the shape of the support portion 11, and the side portion thereof is connected to the joint portion 13. It has a corresponding linear shape. That is, these contact portions 14 have a shape corresponding to the inner shape of the outer casing 2 that extends from the curved portion 12, which has a bottleneck shape, to the support portion 11 through the joint portion 13. These contact portions 14 are inserted between the joint portions 13 and contacted with the support portion 11, so that the coil bobbin 7 (ignition transformer 3) is positioned at a predetermined position in the external housing 2. It has become. Moreover, the space | interval formed between the support part 11 and the coil bobbin 7 by the contact part 14 can be set to the space | interval which is easy to fill with a molding material.

  In the present embodiment, the outer portion 15 of the external housing 2 corresponding to the support portion 11 is also formed in a planar shape, like the support portion 11. Thus, by making the shape of the outer portion 15 the same as that of the inner support portion 11, it is possible to make it difficult for resin sinks or the like to occur when the outer casing 2 is manufactured.

  Moreover, as shown in FIG. 1, the terminal arrangement | positioning part 8 mentioned above is provided so that it may protrude from the side part of the coil bobbin 7, and the outer surface 16 is each formed in planar shape. When the ignition transformer 3 is inserted into the outer casing 2, the planar outer surface 16 comes into contact with the inner wall of the outer casing 2 so that the ignition transformer 3 is guided to a predetermined position. ing.

  Furthermore, as shown in FIG. 1, the inner side part 17 of the output pin 9 planting surface of the terminal arrangement part 8 has a chamfered shape. As a result, when the secondary winding is mechanically wound around the output pin 9, the winding device and the inner portion 17 are unlikely to interfere with each other.

  As shown in FIG. 3, the circuit unit 4 is provided with two input-side electrode terminal mounting lands 20, 21 and four output-side electrode terminal mounting lands 22, 23, 24, 25. These electrode terminal mounting lands 20 to 25 are formed of a conductor pattern formed so as to surround the central through holes 200 to 205 except for the predetermined notches 210 to 215. The directions of the notches 210 to 215 are aligned in a predetermined direction (left side in FIG. 3), and the shape of the conductor pattern is substantially C-shaped.

  The reason why the electrode terminal mounting lands 20 to 25 have such a shape is as follows. That is, when the electronic component and the ignition transformer 3 are mounted on the circuit unit 4 and soldered in the flow tank, solder adheres to the electrode terminal mounting lands 20 to 25, and the through holes 200 to 205 are narrowed. This is to prevent the blockage.

  That is, if these electrode terminal mounting lands 20 to 25 are annular lands, when the electronic parts and the ignition transformer 3 are mounted and soldered in the flow tank, the solder is likely to adhere to the entire lands. For this reason, the center through-holes 200 to 205 may be narrowed or blocked with solder, and the electrode terminals may not be inserted. If the electrode terminals cannot be inserted into the through holes 200 to 205 in this way, the electrode terminals cannot be soldered to the electrode terminal mounting lands 20 to 25. For this reason, a process such as removal of solder is required, which leads to a deterioration in productivity.

  Therefore, in the present embodiment, the conductor pattern portion on the side that comes into contact with the solder in the flow tank is cut out, and the cutout portions 210 to 215 are provided. As a result, the solder in the flow tank first comes into contact with the notches 210 to 215 so that the solder can hardly be placed on the conductor pattern portion, and the solder adheres so as to block the through holes 200 to 205. This can be prevented.

  Depending on the process, first, only electronic components may be mounted on the circuit unit 4 and soldered in a flow tank without mounting the ignition transformer 3. In such a case, it is preferable that the land on which the ignition transformer 3 is soldered has a similar shape.

  Furthermore, openings 26, 27, 28, 29, 30, 31, 32, 33, 34, 35 are provided at the end of the circuit unit 4 by cutting or the like. The outer casing 2 can be easily and reliably filled with a molding material made of resin or the like. Of these openings, the opening 28 has an action of insulating the primary sides, and the openings 29 to 33 have an action of insulating the primary side and the secondary side. , 35 have an action of insulating between the secondary sides.

  As shown in FIG. 4, the output side terminal 40 is composed of a conductive metal plate or the like, and an insertion portion 41 inserted into the external housing 2 is formed into a thin pin shape. A connecting portion 42 located outside and connected to the ignition plug of the combustion device is formed in a flat plate shape. Further, between the insertion portion 41 and the connection portion 42, there is provided a locking portion 43 having an intermediate width and formed in a stepped shape, and a taper is provided on the insertion portion 41 side of the locking portion 43. A portion 44 is provided.

  On the other hand, the outer housing 2 is formed with an insertion hole 45 that matches the size of the insertion portion 41. Further, outside the insertion hole 45, a locking part insertion hole 46 into which the locking part 43 is inserted and a connection part insertion hole 47 into which the connection part 42 is inserted are formed in steps. That is, stepped insertion holes 47, 46, 45 are formed in the outer housing 2 so that the opening area gradually decreases from the outside. The tapered portion 44 is press-fitted into the insertion hole 45 having the smallest opening area, so that the entire output side terminal 40 is supported by the external housing 2. Thus, by making the structure of the insertion portion of the output side terminal 40 into a stepped structure having a plurality of steps, it is possible to prevent the molding material from leaking from the insertion portion of the output side terminal 40. Further, in the present embodiment, since the tapered portion 44 is press-fitted, it is possible to reliably prevent the molding material from leaking from the insertion portion of the output side terminal 40. The outer casing 2 is provided with a protective cylinder 48 so as to surround the connection portion 42 of the output side terminal 40.

  The distal end of the insertion portion 41 of the output side terminal 40 is inserted into one of the output side electrode terminal mounting lands 22, 23, 24, 25 of the circuit unit 4 and soldered. Note that input side terminals 61 and 62 described later have substantially the same configuration.

  Next, the structure of the attachment part to the combustion apparatus provided in the external housing | casing 2 is demonstrated. As shown in FIG. 5, attachment claws 51 and 52 are provided at both ends in the longitudinal direction of the external housing 2. Among these, the attachment claw 51 on the right side in the figure is fixed to the external housing 2. On the other hand, the attachment claw 52 on the right side in the figure has an attachment part 53 extending laterally from the side wall part of the external housing 2 and a bending part 54 extending upward in the figure along the side wall part from the tip side of the attachment part 53. And a claw 55 provided at the tip of the bent portion 54. Then, the claw 55 at the tip can be moved in the left-right direction in the figure mainly by elastically bending the bent portion 54.

  Moreover, as shown in FIG. 6, the corner | angular part of the connection part with the attaching part 53 of the bending part 54 is the chamfering part 56 of the chamfered shape. Therefore, the width W2 of the attachment portion 53 is smaller than the width W1 of the flexure portion 54 shown in FIG.

  By providing the chamfered portion 56 in this manner, the bent portion 54 and the attachment portion 53 are easily bent as a whole.For example, even when the external housing 2 is configured using a glass reinforced PBT resin having excellent heat resistance, The stress applied at the time of attachment / detachment can be relaxed to prevent the occurrence of folding. Moreover, when manufacturing the external housing | casing 2, there exists an effect which makes it difficult to produce the short of resin etc.

  When attaching the high voltage generator 1 for the discharge ignition device configured as described above to the combustion device, the attachment claw 51 of the external housing 2 is first fitted into the attachment portion of the combustion device, and then the attachment claw 52 is bent and the claw 55 is fitted to the attachment portion of the combustion device. Further, a power source is connected to the input side terminals 61 and 62 shown in FIG. 6, and the input terminal of the spark plug is connected to the connecting portion 42 of the output side terminal 40 provided in the protective cylinder 48.

  The power supply voltage input from the input side terminals 61 and 62 is boosted to a predetermined voltage by the ignition transformer 3, thereby generating a high voltage at the output side terminal 40. This high voltage causes a spark discharge in the spark plug to ignite a gas burner or an oil burner.

  As described above, according to the high voltage generator 1 for a discharge ignition device of the present embodiment, solder in an electronic component mounting process adheres to the electrode terminal mounting lands 20 to 25 for mounting electrode terminals, and penetrates. It is possible to prevent a situation in which the electrode terminals cannot be inserted into the holes 200 to 205, and it is possible to improve productivity as compared with the conventional case.

Sectional drawing which shows the structure of the high voltage generator for discharge ignition apparatuses which concerns on one Embodiment of this invention. The perspective view for demonstrating the whole structure of the high voltage generator for discharge ignition devices of FIG. The top view which shows the structure of the circuit unit of the high voltage generator for discharge ignition devices of FIG. The figure for demonstrating the structure of the output side terminal of the high voltage generator for discharge ignition devices of FIG. The side view which shows the structure of the external housing | casing of the high voltage generator for discharge ignition devices of FIG. The front view which shows the structure of the external housing | casing of the high voltage generator for discharge ignition devices of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... High voltage generator for discharge ignition devices, 2 ... External housing, 3 ... Ignition transformer, 4 ... Circuit unit, 6 ... Magnetic core, 7 ... Coil bobbin.

Claims (4)

In the high voltage generator for a discharge ignition device that supplies a high voltage to the spark plug to cause a spark discharge and ignites the fuel,
An ignition transformer configured to insert a magnetic core wound with a primary winding into a central hole of a cylindrical coil bobbin wound with a secondary winding, and boost a power supply voltage;
A circuit unit in which electronic components are mounted on a circuit board, and an electrode terminal mounting land comprising a conductor pattern formed so as to surround the periphery of the through hole except for a predetermined notch on the circuit board. Having a circuit unit;
An external housing that houses the ignition transformer and the circuit unit and is filled with a molding material;
A high voltage generator for a discharge ignition device, comprising: an electrode terminal having one end disposed outside the outer casing and the other end fixed to the electrode terminal mounting land.   The high voltage generator for a discharge ignition device according to claim 1, wherein the land for attaching the electrode terminal is formed in a substantially C shape.   The high-voltage generation for a discharge ignition device according to claim 1 or 2, wherein a plurality of the electrode terminal mounting lands are provided, and the notches of the electrode terminal mounting lands are aligned in a predetermined direction. apparatus.   4. The high voltage generator for a discharge ignition device according to claim 3, wherein the predetermined direction is the same as a conveying direction of the circuit board to a flow tank for soldering the electronic component.

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