JP2008251951A - Metal plate resistor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metal plate resistor preventing packaging failure when packaged on a packaging substrate. <P>SOLUTION: The metal plate resistor has: a box-like case 11 where an upper surface 11a is opened and a cutout section 12 is provided on one side section 11b; an insulating material 13 filled into the case 11; a resistor 14 nearly in a U shape that is buried into the insulating material 13 and has a folding section 14a; and a pair of terminals 15 that is connected to both ends of the resistor 14 and is drawn from the cutout section 12 of the case 11 to the outside of the case 11. A step 17 is provided between a lower part 12a of the cutout section 12 and a bottom surface 11c of the case 11; a projection 16 is provided on a bottom surface 11c of the case 11; the lower surface of the resistor 14 is brought into contact with the upper surface of the projection 16; and the height dimension of the projection 16 is made nearly equal to that of the step 17. <P>COPYRIGHT: (C)2009,JPO&INPIT

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 pair of terminals 4 are configured to be divided into two in the vertical direction as shown in FIG.

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, the position where the pair of terminals 4 abut on the case 2 in the one side surface 1b of the case 2 is higher than the position where the resistor 3 abuts on the bottom surface 1c of the case 2. As shown in FIG. 6, the pair of terminals 4 and the longitudinal direction of the case 2 are not parallel to each other, which causes a problem that mounting failure occurs when mounted on a mounting board.

  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 prevent mounting defects.

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

  The invention according to claim 1 of the present invention is a case in which an upper surface is opened and a notch portion is provided on one side surface portion, an insulating material filled in the case, embedded in the insulating material, and A substantially U-shaped resistor having a folded portion, and a pair of terminals connected to both ends of the resistor and drawn out of the case from the cutout portion of the case, the lower portion of the cutout portion And a bottom surface of the case, a projecting portion is provided on the bottom surface of the case, and a lower surface of the resistor is brought into contact with an upper surface of the projecting portion. The height of the step is substantially the same. According to this configuration, the height of the protrusion and the step between the bottom of the notch provided on one side of the case and the bottom of the case Since the height dimensions are substantially the same, the longitudinal direction of the case and the pair of ends Since this enables reliable mounting when mounted on a mounting board, it is possible to prevent mounting defects and to allow the insulating material to wrap around the lower surface of the resistor by the step. Therefore, the effect of being able to dissipate heat uniformly to the insulating material without biasing the heat generated by the resistor can be obtained.

  In the invention according to claim 2 of the present invention, in particular, the lower surface of the folded portion of the resistor is brought into contact with the upper surface of the protruding portion. According to this configuration, the heat generated in the resistor is transferred to the protruding portion. Since the heat can be radiated to the case, the effect that the temperature of the resistor can be lowered is obtained.

  As described above, the metal plate resistor according to the present invention has a step between the lower portion of the notch portion provided on one side surface of the case and the bottom surface of the case, and a protrusion on the bottom surface of the case. Since the lower surface of the resistor is brought into contact with the upper surface of the part, and the height dimension of the protruding portion and the height dimension of the step are substantially the same, it is connected to the longitudinal direction of the case and both ends of the resistor. In addition, the pair of terminals drawn out of the case from the cutout portion of the case can be made parallel to each other, so that when mounted on the mounting board, reliable mounting can be performed, thereby preventing mounting defects. This is an excellent effect.

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

  1 is a perspective view of a metal plate resistor according to an embodiment of the present invention, FIG. 2 is a top view of the metal plate resistor, and FIG. 3 is a cross-sectional view taken along line AA of FIG. In FIG. 2, the insulating material is not shown and is omitted.

  As shown in FIGS. 1 to 3, the metal plate resistor according to one embodiment of the present invention includes a box-shaped case 11 having an upper surface 11 a that is open and a notch portion 12 in one side surface portion 11 b, and the case. 11, an insulating material 13 filled in the insulating material 13, a substantially U-shaped resistor 14 embedded in the insulating material 13 and having a folded portion 14 a, connected to both ends of the resistor 14, and the case 11 And a pair of terminals 15 drawn out of the case 11 from the notch 12.

  In the above configuration, the box-shaped case 11 is made of ceramic such as alumina, the upper surface 11a is opened, and two cutout portions 12 are provided on one side surface portion 11b. A protrusion 16 that protrudes upward is formed integrally with the case 11 on a part of the bottom surface 11 c of the case 11.

  Each of the two notches 12 is formed so as to penetrate the wall of the one side surface 11b of the case 11, and has a step 17 between the lower portion 12a and the bottom surface 11c of the case 11. . That is, the depth of the notch 12 is shallower than the depth of the case 11. Further, as shown in FIGS. 3 and 4, the height dimension t1 of the protrusion 16 and the height dimension t2 of the step 17 are made substantially the same.

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

  Further, the resistor 14 is formed in a band shape from a metal such as copper or copper nickel, and is embedded in the insulating material 13. And this resistor 14 has the folding | returning part 14a in the approximate center part, and, thereby, is comprised by the substantially U shape by the top view. The lower surface of the folded portion 14 a of the resistor 14 is in contact with the upper surface of the protruding portion 16. The resistor 14 may be formed with a slit for adjusting the resistance value.

  Furthermore, the pair of terminals 15 are made of a material having higher electrical conductivity than the resistor 14 and are linearly connected to both ends of the resistor 14. Further, the tip portion is drawn out of the case 11 from the notch 12 of the case 11. In addition, at least a pair of terminals 15 located outside the case 11 is divided into two in the vertical direction. Further, the pulling direction of the pair of terminals 15 is parallel to the side surface of the resistor 14. That is, the pair of terminals 15 and the resistor 14 are linear when viewed from the side.

  Further, the pair of terminals 15 are respectively placed on the lower portions 12a of the two notches 12, and thereby the resistor 14 and the pair of terminals 15 that are integrally connected to each other are connected to the protruding portion 16. And the lower part 12a of the two notches 12 are supported by a total of three points. In this case, since the insulating material 13 can be wound between the lower surface of the resistor 14 and the pair of terminals 15 that are not in contact with the protruding portion 16 in the case 11 and the bottom surface 11c of the case 11, the resistor 14 The heat generated by the heat is uniformly radiated to the insulating material 13 without being biased. Furthermore, since the lower surface of the folded portion 14a, which is the substantially central portion of the resistor 14 that generates the most heat, is brought into contact with the upper surface of the protruding portion 16, the heat generated in the folded portion 14a is thermally transmitted through the protruding portion 16. The good case 11 can be effectively dissipated. Because of the heat dissipation action, the temperature of the resistor 14 as a whole is lowered, so that the pair of terminals 15 can be lowered in temperature, thereby deteriorating the solder connecting the pair of terminals 15 and the mounting board. Therefore, the connection stability between the metal plate resistor and the mounting substrate can be improved.

  Next, the manufacturing method of the metal plate resistor in one embodiment of the present invention will be described with reference to the drawings.

  First, a box-shaped case 11 is prepared in which the upper surface 11a is opened and the two side portions 11b are provided with two notches 12 whose depth is shallower than the depth of the case 11. The case 11 has a protruding portion 16 protruding upward on a part of the bottom surface 11c, and a height t2 of a step 17 between the lower portion 12a of the notch 12 and the bottom surface 11c of the case 11, and The height t1 of the protrusion 16 is made substantially the same.

  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, a folded portion 14 a is formed at a substantially central portion of the resistor 14 to configure the resistor 14 in a substantially U 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 of the case 11 from the notch 12 provided on the one side surface 11 b of the case 11. . At this time, the lower surface of the folded portion 14 a of the resistor 14 is brought into contact with the upper surface of the protruding portion 16.

  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 metal plate resistor according to the embodiment of the present invention described above, the protruding portion 16 is formed on the bottom surface 11c of the case 11, and the lower surface of the resistor 14 is brought into contact with the upper surface of the protruding portion 16. Since the height dimension t1 of the projecting portion 16 and the height dimension t2 of the step 17 are substantially the same, the longitudinal direction of the case 11 and both ends of the resistor 14 are connected to each other and from the notch portion 12 of the case 11 The pair of terminals 15 drawn to the outside of the case 11 can be made parallel to each other, and therefore, when mounted on a mounting board, reliable mounting can be performed, so that an effect of preventing mounting defects can be obtained. It is.

  That is, when mounting the above-described metal plate resistor on the mounting board, only the case 11 is adsorbed by the nozzle and mounted on the mounting board with the pair of terminals 15 facing vertically downward. When the longitudinal direction of the case 2 and the pair of terminals 4 are not parallel as in the case of the above, since the angle between the pair of terminals 4 and the mounting substrate is not a right angle, a mounting defect occurs. In the metal plate resistor according to the embodiment, the projecting portion 16 is provided on the bottom surface 11c of the case 11, and the lower surface of the resistor 14 is brought into contact with the upper surface of the projecting portion 16, whereby the longitudinal direction of the case 11 Since the pair of terminals 15 connected to both ends of the resistor 14 are parallel to each other, reliable mounting is performed when mounted on a mounting board, thereby preventing mounting defects. What can be done A.

  In the metal plate resistor according to the present invention, a protrusion is provided on the bottom surface of the case, the lower surface of the resistor is brought into contact with the upper surface of the protrusion, and the height of the protrusion and the height of the step are substantially reduced. By having the same, it has the effect of preventing mounting defects, and is particularly useful for metal plate resistors used for detecting current values of various electronic devices such as digital devices, AV devices, and information communication terminals. It will be.

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

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Case 11a Case upper surface 11b Case one side surface 11c Case bottom face 12 Notch 12a Lower part of notch 13 Insulation material 14 Resistor 14a Resistor folded part 15 Pair of terminals 16 Protrusion 17 Step difference

Claims (2)

A case having an open top surface and a notch on one side surface; an insulating material filled in the case; and a substantially U-shaped resistor embedded in the insulating material and having a folded portion A pair of terminals connected to both ends of the resistor and drawn out of the case from the cutout portion of the case, and a step is provided between the lower portion of the cutout portion and the bottom surface of the case In addition, a metal is provided with a protrusion on the bottom surface of the case, the lower surface of the resistor is in contact with the upper surface of the protrusion, and the height of the protrusion is substantially the same as the height of the step. Plate resistor. The metal plate resistor according to claim 1, wherein the lower surface of the folded portion of the resistor is brought into contact with the upper surface of the protruding portion.

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