JP2016115669A - Fuse resistor and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuse resistor, the manufacturing process of which can be simplified, and to provide a method of manufacturing the same.SOLUTION: More specifically, a fuse resistor is installed in the electric circuit of an electronic product, for preventing failure of an apparatus due to an in-rush current, internal temperature rise, a sustaining overcurrent, or the like, and assembled by fitting a temperature fuse module in an insertion recess provided in a molding.SELECTED DRAWING: Figure 1A

Description

  The present invention relates to a fuse resistor and a method for manufacturing the same, and more particularly, installed in an electric circuit of an electronic product to prevent a failure of a device caused by an inrush current, an internal temperature rise, a continuous overcurrent, or the like. The present invention relates to a fuse resistor capable of simplifying the manufacturing process and a method of manufacturing the same because a thermal fuse module is fitted into an insertion recess provided in a molding part and assembled.

  In general, in an electric circuit of a large electronic product such as an LCD TV or a PDP TV, in order to prevent a device failure caused by an inrush current generated when the power is turned on, an internal temperature rise, a continuous overcurrent, or the like. A protective element such as a fuse resistor (Thermal Fuse Resistor) is provided at the power input terminal of the electric circuit to protect the power circuit.

  Such a fuse resistor first includes a resistor and a thermal fuse, and the resistor and the thermal fuse are connected in series with each other via a lead wire.

  In addition, the fuse resistor is designed to package the resistor and thermal fuse in a case so that other electronic components are not affected by the debris generated at the time of fusing of the fusing body. Filled.

  Here, as the filler, a slurry-like filler containing silica (SiO 2) powder is used in consideration of heat resistance, conductivity, curability, and the case is generally generally resistant. A ceramic material case used as a case is used.

  Also, the end portion of the lead wire extends so as to be pulled out of the case, and the conventional fuse resistor solders the end portion of the lead wire to the printed circuit board to establish the resistor and the thermal fuse. It is installed on the printed circuit board so as to be in the installed state.

  Therefore, the fuse resistor provided in this way restricts the current to a predetermined current using a resistor when an inrush current flows, and the resistor when an overcurrent flows. The heat generated by the heat generation is conducted to the thermal fuse through the filler, and the circuit is shut off so that the melted body made of solid lead or polymer pellet provided in the thermal fuse is blown. As a result, the electric circuit of the home appliance is protected.

  5A and 5B are diagrams showing a conventional fuse resistor. With reference to FIG. 5, Patent Document 1 is provided with a resistor 10 and a circuit that is interrupted by the heating action of the resistor 10. The thermal fuse 20, the lead wires 31 and 33 connecting the resistor 10 and the thermal fuse 20 in series, and the resistor 10 and the thermal fuse in a state where the ends of the lead wires 32 and 34 are drawn to the outside. A case 40 provided with one side open to accommodate the inside 20 and a drawing recess 41 for drawing out the lead wire on one side wall surface, and the resistor 10 and the thermal fuse 20 are inserted therein. As described above, there is disclosed a fuse resistor including a filler 50 filled in the case 40 and containing silica powder.

  However, in Patent Document 1, since the circuit board and the thermal fuse are adjacent to each other, the thermal fuse may be blown by heat generated during soldering, and the resistor lead wire 31 and the thermal fuse The process of joining the lead wires 33 is complicated, difficult to automate, and the lead wires 31 and 33 joined in the assembly process may be broken.

Korean Registered Patent No. 10-1060013

  Therefore, the present invention has been devised to solve the above problems, and the object of the present invention is to mount a thermal fuse on a substrate and connect it to a resistor, so that An object of the present invention is to provide a thermal fuse capable of simplifying the manufacturing process and a method of manufacturing the same, because the connection failure is prevented and the thermal fuse module is fitted into the insertion recess provided in the molding part and assembled. .

  For this purpose, a fuse resistor according to the present invention includes a resistor, first and second lead wires connected to the resistor, a molding portion provided with an insertion recess on one side, and fitted into the insertion recess. A substrate on which first and second terminals are formed and a thermal fuse module including a thermal fuse installed on the first and second terminals, wherein one end of the first lead wire is connected to the resistor. A first wire portion forming a first end protruding from the upper side of the insertion recess; and a second end protruding from the lower side of the insertion recess and spaced apart from the first end. And a second wire portion having the other end drawn to the lower side of the molding portion, wherein the first and second terminals are connected to the first and second end portions, respectively.

  The thermal resistor module of the fuse resistor according to the present invention includes a case coupled to the substrate.

  The case of the fuse resistor according to the present invention is characterized in that a temperature fuse accommodating recess for accommodating the temperature fuse is formed, and a separation space is provided between the temperature fuse accommodating recess and the temperature fuse. To do.

  The fuse resistor case according to the present invention includes a blocking portion disposed between the first and second terminals and inserted between the first and second ends, and the first and second terminals are externally provided. The first and second terminal recesses are provided on both sides of the blocking part so as to be exposed to each other.

  Further, the case of the fuse resistor according to the present invention is formed with a coupling protrusion, and the insertion recess is formed with a coupling recess into which the coupling protrusion is fitted.

  The method of manufacturing a fuse resistor according to the present invention includes placing a resistor coupled with first and second lead wires on a mold, injecting resin into the mold to form a molding part, and forming the molding part. An insertion recess that is not molded so that a part of the first lead wire is exposed; cutting the first lead wire that is exposed through the insertion recess; Separating the first and second wire portions, and the first and second end portions of the cut region of the first and second wire portions projecting above and below the insertion recess; and forming the first and second terminals Providing a thermal fuse module comprising: a formed substrate; a thermal fuse installed on the first and second terminals; and a case coupled to the substrate; Characterized in that it comprises a; fitted Le in the insertion recess, and the step of connecting said first and second terminals to each of the first and second end portions.

  According to another aspect of the present invention, there is provided a method for manufacturing a fuse resistor, wherein a first and second wire portions are provided by providing a resistor to which first and second lead wires are coupled and cutting a part of the first lead wire. A step of placing the resistor on the mold such that the first wire portion and the second wire portion are separated from each other; and a resin is injected into the mold to form a molding portion. Providing an insertion recess on one side of the molding part such that the first and second ends of the cut region of the first and second wire parts are exposed to the outside without being molded; Providing a thermal fuse module comprising a substrate on which two terminals are formed, a thermal fuse installed on the first and second terminals, and a case coupled to the substrate; Characterized in that it comprises a; fit the fuse module in the insertion recess, and the step of connecting said first and second terminals to each of the first and second end portions.

  According to the fuse resistor and the manufacturing method thereof according to the present invention configured as described above, since the thermal fuse is surface-mounted on the substrate and connected to the resistor, it is possible to prevent a connection failure from occurring in the manufacturing process, Since the thermal fuse module is fitted into the insertion recess provided in the molding part and assembled, the manufacturing process can be simplified or automated.

It is a perspective view which shows the fuse resistor which concerns on this invention. It is a disassembled perspective view of FIG. 1A. It is AA sectional drawing of FIG. 1A. It is a perspective view which shows the thermal fuse module of this invention. It is BB sectional drawing of FIG. 2A. It is CC sectional drawing of FIG. 2A. It is a figure which shows the state by which the resistor of this invention was molded. It is a figure which shows the state by which the 1st lead wire of this invention was cut. It is sectional drawing which shows the state which the thermal fuse module cut | disconnected in DD direction in FIG. 2A is engage | inserted by an insertion groove. It is sectional drawing which shows the state by which the thermal fuse module cut | disconnected by the EE direction in FIG. 2A is inserted in an insertion groove. It is a figure which shows the resistor in the state by which the 1st lead wire of this invention was cut. It is a figure which shows the state by which the molding part was formed in the resistor of this invention. It is a figure which shows the conventional fuse resistor. It is a figure which shows the conventional fuse resistor.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  In the description of the present invention, if it is determined that a specific description related to a known function or configuration will unnecessarily obscure the gist of the present invention, a detailed description thereof will be omitted. Moreover, the term mentioned later is a term defined in consideration of the function in this invention, and this may change with a user's intent or a precedent. Therefore, the definition should be made based on the contents throughout this specification.

  1A is a perspective view illustrating a fuse resistor according to the present invention, FIG. 1B is an exploded perspective view of FIG. 1A, and FIG. 1C is a cross-sectional view taken along line AA of FIG. 1A. 2A is a perspective view showing the thermal fuse module of the present invention, and FIGS. 2B and 2C are cross-sectional views taken along lines BB and CC in FIG. 2A.

  Referring to FIGS. 1A and 1B, a fuse resistor 100 according to the present invention is provided to be used in an electric circuit of an electronic product, and mainly includes a resistor 110, a molding unit 120, and a thermal fuse module. 130 is included.

  A first lead wire 111 and a second lead wire 117 are provided at both ends of the resistor 110.

  The first lead wire 111 includes a first wire part 112 that is directly connected to the resistor 110 and a second wire part 114 that is spaced apart from the first wire part 112 and is drawn to the lower side of the molding part 120. Become.

  The molding part 120 serves as a casing for the resistor 110, and the resistor 110 and a part of the first and second lead wires 111 and 117 are sealed to be made of a synthetic resin material. However, the present invention is not limited to this. The first and second lead wires 111 and 117 are bent in the molding part 120 and pulled out to the lower side of the molding part 120.

  An insertion recess 121 is provided on one side of the molding part 120, and a thermal fuse module 130 is coupled to the insertion recess 121.

  A first end 113 of the first wire part 112 protrudes above the insertion recess 121 and a second end 115 of the second wire part 114 protrudes below.

  A separation portion 116 is formed between the first end portion 113 and the second end portion 115.

  Referring to FIGS. 1A to 2C, the thermal fuse module 130 is in the form of a structure that fits into the insertion recess 121, and mainly includes a substrate 131, a thermal fuse 137, and a case 140.

  First and second terminals 132 and 132a are formed on one surface of the substrate 131, and the first and second terminals 132 and 132a are connected to the first and second end portions 113 and 115, respectively. Specifically, as shown in FIGS. 2A and 2C, the first and second terminals 132 and 132a are disposed in the central region of the substrate 131 and are connected to the first and second end portions 113 and 115. The connecting portion 134 and a thermal fuse connecting portion 135 that extends to one side of the low antibody connecting portion 134 and is connected to the thermal fuse 137.

  The thermal fuse 137 is connected in series with the resistor 110 and is blown by heat generation of the resistor 110 to cut off the circuit, thereby protecting the elements installed on the circuit. It is installed on the first and second terminals 132 and 132a. That is, the thermal fuse 137 is connected in series with the resistor 110 through the first and second terminals 132 and 132a.

  The case 140 is coupled to one surface of the substrate 131 and is disposed inside the insertion recess 121. At this time, the substrate 131 is disposed outside the insertion recess 121.

  A coupling protrusion 145 may be formed on the outer surface of the case 140, and a coupling recess 122 may be formed in the insertion recess so that the coupling protrusion 145 can be fitted.

  The case 140 may be made of an insulating material such as a synthetic resin or a ceramic material, and includes a blocking portion 141, first and second terminal recesses 142 and 142a, and a thermal fuse housing recess 143. The In the illustrated example, the coupling protrusion 145 and the coupling recess 122 extend linearly along the upper and lower edges of the insertion recess 121. When the case 140 is fitted into the insertion recess 121 from the right side in FIG. , Removably meshed. In this way, the case 140 is prevented from falling off the molding part 120.

  The blocking part 141 is disposed between the first and second terminals 132 and 132a, and is inserted between the first and second end parts 113 and 115 so that the first and second end parts 113 and 115 are connected. Physically shut off.

  The first and second terminal recesses 142 and 142a are spaces provided on both sides of the blocking portion 141, and the first and second end portions 113 are exposed by exposing the first and second terminals 132 and 132a to the outside. , 115 can be coupled.

  The thermal fuse accommodating recess 143 accommodates the thermal fuse 137, and the thermal fuse 137 melted by the heat generation of the resistor 110 between the thermal fuse accommodating recess 143 and the thermal fuse 137. It is preferable that a separation space 144 is provided so that can be opened (blocked).

  As described above, the present invention has an advantage that the resistor and the thermal fuse can be connected through a simple assembly process in which a thermal fuse module made of a structure is provided and fitted into the insertion recess.

  Hereinafter, an embodiment of a method for manufacturing a fuse resistor according to the present invention will be described in detail with reference to the accompanying drawings. However, detailed description of the same or similar contents as those described above will be omitted.

  3A is a diagram illustrating a state in which the resistor of the present invention is molded, FIG. 3B is a diagram illustrating a state in which the first lead wire of the present invention is cut, and FIG. 3C is a DD in FIG. 2A. FIG. 3D is a cross-sectional view showing a state in which the thermal fuse module cut in the direction is fitted into the insertion recess, and FIG. 3D is a cross-sectional view showing a state in which the thermal fuse module cut in the EE direction in FIG. is there.

  Referring to FIG. 3A, in the method of manufacturing a fuse resistor according to the present invention, an insert injection in which a resistor 110 to which first and second lead wires 111 and 117 are coupled is placed on a mold and a resin is injected into the mold. The molding part 120 is formed by a method, and an insertion recess 121 that is not molded is provided on one side of the molding part 120 so that a part of the first lead wire 111 is exposed. In the illustrated example, the insertion recess 121 is open not only on the right side but also on the front and rear sides for die cutting.

  Referring to FIG. 3B, the first lead wire 111 is cut into a first wire part 112 and a second wire part 114, and a first end 113 of the first wire part 112 is formed above and below the insertion recess 121. The second end portion 115 of the second wire portion 114 protrudes, and a separation portion 116 is provided between the first end portion 113 and the second end portion 115.

  Referring to FIG. 3C, a substrate 131 on which the first and second terminals 132 and 132 a are formed, a thermal fuse 137 installed on the first and second terminals 132 and 132 a, and a case coupled to the substrate 131. 140 is provided, the thermal fuse module 130 is fitted into the insertion recess 121, and the first and second terminals 132 and 132a are connected to the first and second end portions 113 and 115, respectively.

  More specifically, the blocking part 141 of the case 140 is inserted to the innermost part of the insertion recess 121 through the separation part 116, and is formed on the substrate 131, and is based on the blocking part 141. The first and second terminals 132 and 132a exposed through the first and second terminal recesses 142 and 142a arranged above and below come into contact with the first and second end portions 113 and 115, respectively. At this time, the solder 133 is applied on the first and second terminals 132 and 132a, and the first and second ends 113 and 115 are intimately coupled through the soldering.

  Referring to FIG. 3D, in the thermal fuse module 130, the coupling protrusion 145 formed on the case 140 may be press-fitted and fixed to the coupling recess 122 formed on the insertion recess 121, which is illustrated. However, an adhesive member may be applied to the outer surface of the case 140 and fixed.

  FIG. 4A is a view showing a resistor in a state where the first lead wire of the present invention is cut, and FIG. 4B is a view showing a state in which a molding part is formed on the resistor of the present invention.

  Referring to FIGS. 4A and 4B, in the method of manufacturing a fuse resistor according to the present embodiment, first, a resistor 110 to which first and second lead wires 111 and 117 are coupled is provided. A part is cut and separated into a first wire portion 112 and a second wire portion 114.

  Then, the resistor 110 is placed on a mold so that the first wire portion 112 and the second wire portion 114 are spaced apart from each other, and resin is injected into the mold to form a molding portion 120.

  At this time, the first and second end portions 113 and 115 of the cut region of the first and second wire portions 112 and 114 are inserted into one side of the molding portion 120 so that they are exposed to the outside without being molded. A recess 121 is provided.

  Thereafter, as described with reference to FIGS. 3B and 3C, the substrate 131 on which the first and second terminals 132 and 132a are formed, and the thermal fuse 137 installed on the first and second terminals 132 and 132a. And a thermal fuse module 130 comprising a case 140 coupled to the substrate 131, the thermal fuse module 130 is fitted in the insertion recess 121, and the first and second terminals 132 and 132a are respectively connected to the first and second terminals. The end portions 113 and 115 are connected.

  That is, the present embodiment is different from the above-described embodiment in that the molding portion is formed after the first lead wire is cut first.

  In conclusion, in the conventional fuse resistor, after joining the lead wire provided in the resistor and the lead wire provided in the thermal fuse, the combined body of the resistor and the thermal fuse is inserted into the case, The case was manufactured by filling the inside of the case with a filling material. However, in the present invention, instead of the filling material, a molding part is formed through insert injection, and a thermal fuse module in which a thermal fuse is surface-mounted on a substrate is provided. Since the module is inserted into the insertion recess provided in the molding part, there is an advantage that the assembly process can be simplified.

  On the other hand, while the detailed description of the present invention and the accompanying drawings have been described with reference to specific embodiments, the present invention is not limited to the disclosed embodiments, but by those having ordinary knowledge in the technical field to which the present invention belongs. Various substitutions, modifications and changes can be made without departing from the technical idea of the present invention. Therefore, the scope of the present invention should not be defined by being limited to the embodiments described, but should be construed to include not only the claims described below, but also equivalents to the claims. I must.

100 fuse resistor 110 resistor 111 first lead wire 112 first wire portion 113 first end portion 114 second wire portion 115 second end portion 116 separation portion 117 second lead wire 120 molding portion 121 insertion groove 122 coupling groove 130 Thermal fuse module 131 Substrate 132, 132a First and second terminals 133 Solder 134 Low antibody connection part 135 Thermal fuse connection part 137 Thermal fuse 140 Case 141 Blocking part 142, 142a First and second terminal grooves 143 Thermal fuse accommodation groove 144 Separation space 145 coupling protrusion

Claims (7)

A resistor,
First and second lead wires connected to the resistor;
A molding part provided with an insertion recess on one side;
A thermal fuse module including a substrate on which the first and second terminals are formed and a thermal fuse installed on the first and second terminals;
The first lead wire is
A first wire portion having one end connected to one side of the resistor and the other end protruding from the upper side of the insertion recess; and one end protruding from the lower side of the insertion recess; A second end portion that is separated from the end portion, and the other end includes a second wire portion that is pulled out to the lower side of the molding portion;
The second lead wire has one end connected to the other side of the resistor and the other end pulled out to the lower side of the molding part,
The first and second terminals are connected to the first and second ends, respectively.
A fuse resistor characterized by that. The thermal fuse module further includes a case coupled onto the substrate.
The fuse resistor according to claim 1. The case is formed with a thermal fuse housing recess for housing the thermal fuse,
A separation space is provided between the thermal fuse housing recess and the thermal fuse.
The fuse resistor according to claim 2. The case includes a blocking portion disposed between the first and second terminals and inserted between the first and second ends, and the blocking portion so that the first and second terminals are exposed to the outside. First and second terminal recesses provided on both sides of the
The fuse resistor according to claim 2. A coupling protrusion is formed in the case, and a coupling recess into which the coupling protrusion is fitted is formed in the insertion recess.
The fuse resistor according to claim 2. A resistor to which the first and second lead wires are coupled is placed on a mold, and a molding part is formed by injecting resin into the mold. A part of the first lead wire is formed on one side of the molding part. Providing an insertion recess in which molding is not performed so that is exposed;
The first lead wire exposed through the insertion recess is cut and separated into first and second wire portions, and the first and second ends as the cut regions of the first and second wire portions are the insertion recess. Step to protrude above and below,
Providing a thermal fuse module comprising a substrate on which first and second terminals are formed, a thermal fuse installed on the first and second terminals, and a case coupled to the substrate;
Fitting the thermal fuse module into the insertion recess, and connecting the first and second terminals to the first and second ends, respectively;
A method of manufacturing a fuse resistor, comprising: Providing a resistor to which the first and second lead wires are coupled, and cutting a part of the first lead wire to separate the first wire portion and the second wire portion;
Placing the resistor on the mold such that the first wire portion and the second wire portion are spaced apart from each other;
The molding portion is formed by injecting resin into the mold to form a molding portion, and the first and second end portions as the cut regions of the first and second wire portions are exposed to the outside without being molded. Providing an insertion recess on one side;
Providing a thermal fuse module comprising a substrate on which first and second terminals are formed, a thermal fuse installed on the first and second terminals, and a case coupled to the substrate;
Fitting the thermal fuse module into the insertion recess, and connecting the first and second terminals to the first and second ends, respectively;
A method of manufacturing a fuse resistor, comprising: