JP5135851B2 - Metal plate resistor - Google Patents

Description

  The present invention relates to a metal plate resistor used for detecting a current value of various electronic devices such as digital devices, AV devices, and information communication terminals.

  As shown in FIG. 5, a conventional metal plate resistor of this type includes a box-shaped case 2 having an upper surface 1a opened, a cement (not shown) filled in the case 2, and this cement (see FIG. (Not shown) A substantially U-shaped resistor 3 embedded in the resistor 3, and provided at both ends of the resistor 3, and the leading ends thereof are pulled out from the side surface 1 b of the case 2 to the outside of the case 2. The configuration includes a pair of terminals 4.

As prior art document information relating to the invention of this application, for example, Patent Document 1 is known.
Japanese Utility Model Publication No. 3-1402 (Microfilm of Japanese Utility Model Application No. 1-58074)

  In the conventional metal plate resistor described above, since the resistor 3 is merely bent in a substantially U shape, the length of the resistor 3 cannot be increased. As a result, the resistor 3 is generated. Since heat cannot be effectively radiated, the temperature of the entire resistor 3 is increased, and the pair of terminals 4 connected to both ends thereof are in a high temperature state. Thus, when the pair of terminals 4 is in a high temperature state, the solder connecting the pair of terminals 4 and the mounting board is deteriorated, so that the connection stability between the metal plate resistor and the mounting board is deteriorated. Had.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a metal plate resistor that can improve the connection stability with a mounting substrate.

  In order to achieve the above object, the present invention has the following configuration.

According to the first aspect of the present invention, there is provided a case having an upper surface opened and a notch portion provided on one side surface portion, an insulating material filled in the case, and a resistance embedded in the insulating material. And a pair of terminals connected to both ends of the resistor and the tip of the resistor being drawn out of the case from the cutout portion of the case, and forming a plurality of folded portions on the resistor, And the plurality of folded portions are arranged so as to be in contact with and along the outer periphery of the plurality of convex portions provided so as to protrude upward on the bottom surface of the case. According to this configuration, the folded portion is provided on the resistor. Since a plurality of folded portions are formed, the length of the resistor can be increased by the plurality of folded portions, and the plurality of folded portions formed on the resistor are arranged along the outer periphery of the plurality of convex portions. Therefore, the heat generated by the resistor is It can be radiated to the over scan. As a result, since the heat generated in the resistor is effectively dissipated, the temperature of the resistor as a whole is lowered, thereby making it possible to lower the temperature of the pair of terminals. This eliminates the deterioration of the solder for connecting the resistor, and further, by arranging the folded portion of the resistor along the outer periphery of the convex portion, the effect that the resistor can be easily processed is obtained. It is what

  The invention according to claim 2 of the present invention is such that a resistor and a pair of terminals are connected particularly in the vicinity of the folded portion. According to this configuration, the solder and the resistor that connect the pair of terminals to the mounting substrate Therefore, the heat generated by the resistor is less likely to be transmitted to the solder connecting the pair of terminals and the mounting board, thereby obtaining the effect of preventing the solder from deteriorating. Is.

As described above, since the metal plate resistor of the present invention has a plurality of folded portions formed on the resistor, the plurality of folded portions can increase the length of the resistor. Since the plurality of formed folded portions are arranged so as to be in contact with and along the outer periphery of the plurality of convex portions provided so as to protrude upward on the bottom surface of the case, the heat generated by the resistor passes through the convex portions. The case can be dissipated, and as a result, the heat generated in the resistor is effectively dissipated, so that the temperature of the entire resistor is lowered, thereby making it possible to lower the temperature of the pair of terminals. The solder that connects the pair of terminals and the mounting board is no longer deteriorated, and this brings about an excellent effect that the connection stability with the mounting board can be improved.

  Hereinafter, a metal plate resistor according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a metal plate resistor according to an embodiment of the present invention, and FIG. 2 is a top view of a main part of the metal plate resistor. In FIG. 2, the insulating material is omitted from illustration.

  As shown in FIGS. 1 and 2, a metal plate resistor according to an embodiment of the present invention includes a box-shaped case 11 having an upper surface 11a open and a cutout portion 12 in one side surface portion 11b. 11 is filled with an insulating material 13, a resistor 14 embedded in the insulating material 13, and both ends of the resistor 14 are connected to each other. It is set as the structure provided with a pair of terminal 15 pulled out outside.

  In the above configuration, the box-like case 11 is made of ceramic such as alumina or steatite, and the upper surface 11a is opened, and two cutouts 12 are provided on one side surface portion 11b. Further, as shown in FIGS. 3 and 4, two convex portions 16 projecting upward from the bottom surface 11 c of the case 11 are formed on a part of the bottom surface 11 c of the case 11. The convex portion 16 is formed by projecting a part of the bottom surface 11 c of the case 11 upward, and is formed integrally with the case 11. Further, the height of the convex portion 16 is the same as or lower than the filling depth of the insulating material 13. In addition, the shape viewed from the upper surface of the convex portion 16 is a rectangle, but may be another shape such as a triangle or a circle.

  When this metal plate resistor is mounted on the mounting board, the pair of terminals 15 are soldered to the mounting board with the one side surface portion 11b of the case 11 facing downward.

  The insulating material 13 is made of cement or the like filled in the case 11 and hardened, and is provided to protect the resistor 14 or to dissipate heat generated by the resistor 14. is there.

  In addition, the resistor 14 is formed in a band shape from an alloy such as copper, copper nickel, or nickel chrome, and is embedded in the insulating material 13. The resistor 14 is provided with two folded portions 17 bent in a substantially U shape so as to be folded back approximately 180 ° in the case 11. In other words, the folded portion 17 protrudes from the one side surface portion 11 b of the case 11 toward the other side surface portion facing the case 11. Further, another folded portion 17a folded in the opposite direction is provided between the two folded portions 17, so that the resistor 14 in the case 11 is configured in an approximately M shape. ing. The resistor 14 may be formed with a slit for adjusting the resistance value.

  Further, the folded portion 17 of the resistor 14 is folded back along the outer periphery of the convex portion 16, and thus the folded portion 17 of the resistor 14 is arranged along the outer periphery of the convex portion 16. As a result, the resistor 14 can be easily processed. Further, the presence of the convex portion 16 can prevent the resistors 14 or the resistors 14 and the pair of terminals 15 from coming into contact with each other inside the case 11 and short-circuiting.

  Furthermore, the pair of terminals 15 is formed of a metal material having a band shape or a circular cross section and having a higher thermal conductivity than the resistor 14, and is connected to both ends of the resistor 14. Has been. Moreover, the front-end | tip part is pulled out of the case 11 from the notch 12 of the case 11, and the pair of terminals 15 positioned at least outside the case 11 are each divided into two in the vertical direction. In addition, you may not be divided into two.

  Further, the connecting portion 15a between the resistor 14 and the pair of terminals 15 is set in the vicinity of the front portion of the turn-back portion 17, thereby being a solder and a heating element for connecting the pair of terminals 15 to the mounting board. Since the distance to the resistor 14 can be increased, it is possible to prevent deterioration of the solder connecting the pair of terminals 15 and the mounting board. That is, since the heat generated in the resistor 14 is dissipated to the pair of terminals 15 having relatively good heat conduction, the connection portion 15a of the case 11 having two notches 12 as in the conventional example shown in FIG. If it exists in the vicinity of the one side surface portion 11b, the heat generated by the resistor 14 is easily transmitted to the mounting substrate side, and the solder connecting the pair of terminals 15 and the mounting substrate becomes high temperature and deteriorates.

  In addition, at least one of the resistor 14 and the pair of terminals 15 is in contact with a part of the outer periphery of the convex portion 16, so that the heat generated in the resistor 14 passes through the convex portion 16. Thus, it is possible to effectively dissipate heat to the case 11 having good heat conduction.

  Next, the manufacturing method of the metal plate resistor in one embodiment of this invention is demonstrated, referring FIGS.

  First, the upper surface 11a is opened, and two cutouts 12 are provided in one side surface portion 11b. Further, two convex portions 16 projecting upward from the bottom surface 11c of the case 11 are formed on a part of the bottom surface 11c. A box-shaped case 11 is prepared.

  Next, a pair of terminals 15 whose front ends are divided into two in the vertical direction are joined to both ends of the strip-shaped resistor 14 by a method such as welding.

  Next, as shown in FIG. 2, three portions of the resistor 14 are folded into a substantially U shape so that the resistor 14 is folded back by about 180 ° to form a folded portion 17 and another folded portion 17a. Construct in a shape.

  Next, the resistor 14 is accommodated in the case 11 from the opening of the upper surface 11 a of the case 11, and the pair of terminals 15 are pulled out from the notch 12 of the case 11 to the outside of the case 11. At this time, the folded portion 17 of the resistor 14 is arranged along the outer periphery of the convex portion 16.

  The folded portion 17 of the resistor 14 is not formed in advance as described above, but may be formed by bending the linear resistor 14 using the convex portion 16 of the case 11.

  Finally, as shown in FIG. 1, the metal plate resistor is manufactured by filling the insulating material 13 from the opening of the upper surface 11a of the case 11 and curing the insulating material 13 at a predetermined temperature. is there.

  In the above-described metal plate resistor according to the embodiment of the present invention, since the folded portion 17 is formed in the resistor 14 at two locations, the length of the resistor 14 is increased by the two folded portions 17. Moreover, since the folding | returning part 17 of the resistor 14 is arrange | positioned along the outer periphery of the convex part 16 provided in the bottom face 11c of the case 11 so that it may protrude upwards, it generate | occur | produced in the resistor 14 Heat can be radiated to the case 11 via the convex portion 16. As a result, since the heat generated in the resistor 14 is effectively dissipated, the temperature of the resistor 14 as a whole is lowered, and thus the pair of terminals 15 can be cooled to a low temperature. The solder which connects 15 and a mounting board is not deteriorated, but the effect that the connection stability with a mounting board can be improved is acquired.

  In addition, when the connecting portion 15a between the resistor 14 and the pair of terminals 15 is set in the vicinity of the folded portion 17, the length of the resistor 14 is shortened, but as in the embodiment of the present invention. In addition, if the folded portion 17 is formed in two places on the resistor 14 and the resistor 14 is configured in a substantially M shape, the length of the resistor 14 will not be shortened. Furthermore, in this case, the distance between the solder connecting the pair of terminals 15 to the mounting substrate and the resistor 14 as the heating element can be increased, and the heat generated in the resistor 14 is radiated to the case 11 via the convex portion 16. Therefore, the pair of terminals 15 can be lowered in temperature, so that the solder that connects the pair of terminals 15 and the mounting board does not deteriorate at a high temperature.

  In the metal plate resistor according to the embodiment of the present invention described above, the two folded portions 17 are provided. However, the folded portions 17 may be formed at three or more locations. Further, in addition to the two convex portions 16 described above, another convex portion 16 may be formed separately, and the other folded portion 17 a may be along the outer periphery of the separate convex portion 16.

  The metal plate resistor according to the present invention is arranged on the mounting board by arranging the plurality of folded portions formed on the resistor along the outer periphery of the plurality of convex portions provided to protrude upward on the bottom surface of the case. It has the effect of improving the connection stability with the mounting substrate when mounted, and in particular, metal used for detecting the current value of various electronic devices such as digital devices, AV devices, information communication terminals, etc. This is useful in plate resistors.

The perspective view of the metal plate resistor in one embodiment of this invention Top view of the main part of the metal plate resistor Top view of the same metal plate resistor case AA line sectional view of FIG. Top view of the main parts of a conventional metal plate resistor

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Case 11a Upper surface of case 11b One side surface part of case 11c Bottom surface of case 12 Notch part 13 Insulation material 14 Resistor 15 Pair of terminals 16 Convex part 17 Folding part

Claims (2)

A case with an open top surface and a notch on one side, an insulating material filled in the case, a resistor embedded in the insulating material, and both ends of the resistor And a pair of terminals drawn from the cutout portion of the case to the outside of the case, and a plurality of folded portions are formed on the resistor, and the plurality of folded portions are formed on the bottom surface of the case. A metal plate resistor disposed so as to be in contact with and along the outer periphery of a plurality of convex portions provided so as to protrude upward. The metal plate resistor according to claim 1, wherein the resistor and the pair of terminals are connected in the vicinity of the folded portion.

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