JP2005039058A - Capacitor stored in case - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a capacitor stored in a case by which the accuracy of a pitch between lead members can be improved and the lead members are prevented from being easily inclined. <P>SOLUTION: The capacitor stored in the case is obtained by storing a capacitor element 3 connecting its both end faces 1, 1 to lead members 2, 2 in a case 4 and filled with resin. A substrate 11 having projected parts 21, 21 in the vicinity of an aperture 10 is arranged in the case 4. Guiding through holes 20, 20 for drawing out the lead members 2, 2 of the capacitor element 3 to the outside are formed in the projected parts 21, 21. An engagement part K for engaging and supporting the substrate 11 is formed at the inner surface 18 of the case 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cased capacitor.

  Conventionally, as shown in FIG. 6, a cased capacitor is one in which a capacitor element 51 is housed in a case 52 and filled with resin. Note that both end faces 53, 53 of the capacitor element 51 are metallicon electrodes formed by thermal spraying a metallicon metal such as zinc. Further, lead members 54 and 54 made of lead wires, stranded wires, metal terminals, and the like are connected to both end faces 53 and 53 by spot welding or soldering.

  However, since the lead members 54 and 54 are fixed only at the connection portions with the end surfaces 53 and 53, when a single wire such as a CP wire (copper-clad steel wire) is used as the lead members 54 and 54, the lead member 54 is used. , 54 is difficult to set with high accuracy. Therefore, for example, a through hole is provided in the bottom wall of the case 52 and the lead members 54 and 54 are inserted into the through hole so that the pitch between the lead members 54 and 54 can be maintained with high accuracy. It was. However, even if such a through hole is used, the lead members 54 and 54 may be inclined.

  The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a cased capacitor that can improve the pitch accuracy between lead members and the lead members are difficult to tilt. is there.

  Accordingly, a cased capacitor according to claim 1 is a cased capacitor in which a capacitor element 3 having lead members 2 and 2 connected to both end faces 1 and 1 is housed in a case 4 and filled with resin. In addition, the substrate 11 having the protruding portions 21 and 21 is disposed in the vicinity of the opening 10, and the lead members 2 and 2 of the capacitor element 3 are pulled out of the case to the protruding portions 21 and 21. Guide through holes 20 and 20 are provided, and an engagement portion K for engaging and supporting the substrate 11 is provided on the inner surface 18 of the case.

  In the case-equipped capacitor according to the first aspect, the protruding portions 21 and 21 are provided on the substrate 11, and the protruding portions 21 and 21 have guide through-holes for drawing the lead members 2 and 2 of the capacitor element 3 out of the case. 20 and 20 are provided, the length of the guide through-holes 20 and 20 is longer than the thickness of the substrate (thickness of the portion not including the protruding portion). Can be stably pulled out of the case along the axial direction of the guide through holes 20 and 20. In addition, since the substrate 11 having the guide through holes 20 and 20 is disposed, the pitch accuracy between the lead members 2 and 2 can be improved. Further, since the engagement portion K for engaging and supporting the substrate 11 is provided on the inner surface of the case, the substrate 11 can be stably supported in the case 4.

  In the case-containing capacitor according to the second aspect, the concave portion 24 constituting the engaging portion K is provided on the case inner surface 18 facing the end surface 1 of the capacitor element 3, and the substrate 11 is engaged with the concave portion 24. It is characterized in that the joining piece portion 22 is formed.

  In the case-containing capacitor according to the second aspect, since the concave portion 24 constituting the engaging portion K is provided on the case inner surface 18 facing the end surface 1 of the capacitor element 3, the engaging piece of the substrate 11 is provided in the concave portion 24. By engaging the portion 22, the substrate 11 can be reliably supported in the case 4.

  In the case-containing capacitor according to claim 3, the connecting portion 37 of the lead member 2 to the end face 1 of the capacitor element 3 is provided on the case bottom side opposite to the opening side of the axis of the capacitor element 3. It is a feature.

  In the case-containing capacitor according to the third aspect, since the connecting portion 37 of the lead member 2 to the end face 1 of the capacitor element 3 is provided on the case bottom side opposite to the opening side of the axis of the capacitor element 3, This connecting portion 37 is relatively far away from the guide through hole 20.

  According to a fourth aspect of the present invention, there is provided a case-containing capacitor in which a pressing piece 16 for pressing the capacitor element 3 accommodated in the case 4 is formed on the substrate 11.

  In the case-containing capacitor according to the fourth aspect of the present invention, since the pressing piece portion 16 for pressing the capacitor element 3 accommodated in the case 4 is formed, the capacitor element 3 can be supported while being pressed by the substrate 11.

  The capacitor with a case of claim 5 is characterized in that the length of the guide through hole 20 is set to be equal to or larger than the outer diameter of the lead member 2.

  In the cased capacitor according to the fifth aspect of the invention, since the length of the guide through-hole 20 is set to be equal to or larger than the outer diameter of the lead member 2, the length of the guide through-hole 20 is increased. The member 2 can be pulled out stably and reliably along the axial direction of the guide through hole 20.

  According to the cased capacitor of the first aspect, the length dimension of the guide through hole is longer than the thickness dimension of the substrate (thickness dimension of the portion not including the protruding portion), and the lead member is used for this guide. It can be stably pulled out of the case along the axial direction of the through hole. This makes it difficult to form a bent portion in the lead member and prevents the lead member from being inclined. In addition, the pitch accuracy between the lead members can be improved, and the lead member can be connected to other members of the capacitor with high accuracy. Furthermore, since the engaging portion for engaging and supporting the substrate is provided on the inner surface of the case, the substrate can be stably supported in the case. As a result, the assembling workability of the capacitor can be improved.

  According to the case-containing capacitor of the second aspect, the lead member is stably pulled out from the case, so that it is possible to further improve the pitch accuracy and prevent the lead member from being inclined.

  According to the cased capacitor of the third aspect, the connection portion of the lead member to the end face of the capacitor element is relatively separated from the guide through hole, and it is possible to prevent a large external force from acting on the connection portion. it can. That is, if the lead is displaced by the same amount in the guide through hole, the force acting on the joint is separated if the connection portion is separated from the case close to the guide through hole. It is smaller than the case where it is near, and it can prevent that a big external force acts on a connection part. For this reason, the connection part is prevented from coming off from the end face of the lead member, and the quality of the product is improved.

  According to the case-containing capacitor according to the fourth aspect, the capacitor element can be supported while being pressed by the substrate, and the capacitor element does not rattle within the case, and a stable resin filling operation can be performed.

  According to the cased capacitor of the fifth aspect, the lead member can be stably and surely pulled out along the axial direction of the guide through-hole, and the lead member can be more reliably prevented from tilting.

  Next, specific embodiments of the cased capacitor of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an exploded perspective view of a cased capacitor. In this case-containing capacitor, a capacitor element 3 having lead members 2 and 2 connected to both end faces 1 and 1 as end electrodes is housed in a case 4 and filled with resin. Capacitor element 3 is formed by winding a metallized film around the outer periphery of core 3a (see FIG. 3). Metallicon metal is thermally sprayed on both end faces of the wound body so that end electrodes 1 and 1 are formed. Is formed.

  As shown in FIGS. 1 and 2 to 4, the case 4 includes a front wall 5, a rear wall 6, an arc-shaped bottom wall 7 that continuously connects the front wall 5 and the rear wall 6, and right and left , And has an opening (upper opening) 10. Then, the substrate 11 is further accommodated in the case 4 in a state where the capacitor element 3 is accommodated in the case 4 via the upper opening 10. The bottom wall 7 has an arc shape so as to follow the outer shape of the capacitor element 3 to be accommodated. That is, as shown in FIG. 4, the curvature radius of the bottom wall 7 is set to be substantially the same as the curvature radius of the outer shape of the capacitor element 3 or slightly larger than the curvature radius of the outer shape of the capacitor element 3.

  The substrate 11 includes a front side part 12, a rear side part 13, and connecting side parts 14 and 15 that connect the front side part 12 and the rear side part 13. One connecting side portion 14 includes a front inclined side portion 14a, a rear inclined side portion 14b, and a connecting portion 14c that connects the front inclined side portion 14a and the rear inclined side portion 14b, and the other connected side. The part 15 also includes a front inclined side part 15a, a rear inclined side part 15b, and a connecting part 15c that connects the front inclined side part 15a and the rear inclined side part 15b.

  In addition, a pair of pressing piece portions 16 and 16 are provided on the front side portion 12 and the rear side portion 13, respectively. Each of the presser pieces 16 is made up of a flat piece suspended from the front side portion 12 and the rear side portion 13, and is provided with a notch portion 17 that fits to the outer surface of the capacitor element 3, as shown in FIG. ing. That is, the radius of curvature of the notch surface 17 a of the notch 17 is set to be substantially the same as the radius of curvature of the outer surface of the capacitor element 3, and when the substrate 11 is attached to the case 4, the notch 17 becomes the outer surface of the capacitor element 3. Thus, the capacitor element 3 can be pressed.

  The connecting portions 14 c and 15 c of the connecting side portions 14 and 15 of the substrate 11 are provided with guide through holes 20 and 20 through which the lead members 2 and 2 of the capacitor element 3 are inserted. That is, the protruding portions 21 and 21 projecting upward are provided on the connecting portions 14c and 15c, and a hole is formed through the protruding portions 21 and 21 and the connecting portions 14c and 15c. The through-holes 20 and 20 can be formed. At this time, the length L (see FIG. 5) of the guide through hole 20 is preferably set to be equal to or larger than the diameter of the lead member 2, and more preferably set to be three times or more the diameter of the lead member 2. preferable. The length L of the guide through hole 20 is obtained by adding the height of the protruding portion 21 protruding from the substrate 11 to the thickness of the substrate 11 itself. Further, the inner diameter dimension D (see FIG. 5) of the guide through hole 20 is slightly larger than the diameter of the lead member 2 (for example, 1.1 to 1.3 times, preferably about 1.2 times). Dimension) is preferable.

  By the way, each of the connecting side portions 14 and 15 of the substrate 11 is provided with engaging piece portions 22 and 22 protruding outward, and the engaging piece portions 22 and 22 are provided on the case 4. , K is engaged, and the substrate 11 is accommodated in the case 4. The engaging portions K, K are recessed portions 24 provided on the case inner surfaces 18, 18 (in this case, the inner surfaces of the side walls 8, 9) facing the end surfaces 1, 1 of the capacitor element 3 housed in the case 4. 24. In this case, the recesses 24 and 24 are formed by projecting the center portions of the upper ends of the side walls 8 and 9 outward, respectively. For this reason, each recess 24, 24 has bottom surfaces 26, 26, front surfaces 27, 27, and rear surfaces 28, 28. And when engaging piece part 22 and 22 are engaged with each recessed part 24 and 24, while the lower surface of engaging piece part 22 and 22 is received by the bottom face 26 and 26 of each recessed part 24 and 24, The front end is in contact with the front surfaces 27, 27 of the recesses 24, 24, and the rear end is in contact with the rear surfaces 28, 28 of the recesses 24, 24. Thereby, the board | substrate 11 is accommodated in the case 4 without rattling. In the state of being housed in this way, as described above, the notch portions 17 of the pressing piece portions 16 can be fitted to the outer surface of the capacitor element 3 to hold the capacitor element 3. At this time, as shown in FIGS. 3 and 4, the protruding portions 21 and 21 have such a height that their upper ends 21 a and 21 a do not protrude from the opening edge 30 of the case 4.

  Further, locking projections 31, 31 are provided on the inner surfaces of the respective recesses 24, 24, and the locking projections 31 prevent the substrate 11 from coming off from the case 4. That is, as shown in FIG. 5, each of the locking projections 31, 31 has a triangular cross-section, and when the engaging pieces 22, 22 of the substrate 11 are engaged with the recesses 24, 24, 32, 32 and the bottom surfaces 26, 26 of the recesses 24, 24, respectively. For this reason, the dimension H between the lower surface 32 and the bottom surface 26 is set to be approximately the same as the thickness T of the substrate 11.

  Therefore, when the board 11 is housed in the case 4, the engagement pieces 22 and 22 of the board 11 are engaged with the recesses 24 and 24, respectively. The portions 22 and 22 are engaged with the side walls 8 and 9 of the case 4 with their upper ends elastically deformed outward while being guided by the inclined surfaces 33 and 33 of the locking projections 31 and 31, respectively. It will be. When the substrate 11 is engaged, the engagement pieces 22 and 22 are sandwiched between the locking projections 31 and 31 and the bottom surfaces 26 and 26 of the recesses 24 and 24, and the substrate 11 is in the case. 4 is stably housed.

  The capacitor element 3 is connected to both end faces 1 and 1 of a single lead member 2 or 2 such as a CP wire (copper-clad steel wire). In this case, the connecting portion 37 is shown in FIG. As shown, it is provided on the case bottom side on the side opposite to the opening of the case 4 with respect to the axis of the capacitor element 3. That is, the connecting portion 37 is disposed on the opposite side of the guide through hole 20 with respect to the axis of the capacitor element 3, and the lead member 2 is disposed in the case 4 along the vertical direction (vertical direction). For this reason, the connection part 37 is provided in the position away from the through-hole 20 for guides. The CP wire is obtained by plating mild steel (low carbon steel) with copper as the core material.

  As described above, if the capacitor element 3 and the substrate 11 are accommodated in the case 4, the resin is filled in the case 4. However, as shown in FIG. The gaps S1, S2, S3, S4, and S5 are formed in the resin, and the resin is filled through the gaps S1, S2, S3, S4, and S5. Further, the resin is filled up to the vicinity of the opening edge 30 of the case 4 of the substrate 11. By the way, since the bottom wall 7 of the case 4 has an arc shape, the case 4 is along the outer shape of the capacitor element 3, and the amount of resin filling is larger than that of the rectangular box type shown in FIG. Can be reduced. Further, since the bottom wall 7 has an arc shape, the case 4 is stably placed on the placement portion 35 during assembly (during resin molding), as shown by the phantom lines in FIG. The plurality of legs 36 are preferably provided on the outer surface of the bottom wall 7.

  In the cased capacitor configured as described above, the substrate 11 having the guide through holes 20 and 20 for drawing the lead members 2 and 2 of the capacitor element 3 out of the case is disposed in the case 4. The pitch accuracy between the lead members 2 and 2 can be improved. As a result, this capacitor can be stably connected to various devices. A guide through hole 20 is provided in the protruding portion 21 of the substrate 11, and the length L of the guide through hole 20 is set to be equal to or larger than the outer diameter of the lead member 2. For this reason, the lead member 2 can be pulled out of the case along the axial center direction of the guide through-hole 20, and it is difficult to form a bent portion, and the lead member 2 can be prevented from being inclined. Thereby, the connection work of the lead members 2 and 2 to other members of the capacitor can be performed with high accuracy. The improvement of the pitch accuracy and the effect of preventing the inclination of the lead member 2 are particularly noticeable when a single wire such as a CP wire is used for the lead member 2.

  Furthermore, since the engagement portions K, K for engaging and supporting the substrate 11 are provided on the case inner surface 18, the substrate 11 can be stably supported in the case 2. As a result, the assembling workability of the capacitor can be improved. Further, since the connecting portion 37 of the lead member 2 to the end face 2 of the capacitor element 3 is provided on the case bottom side opposite to the opening of the capacitor element 3, the connecting portion 37 has a guide through hole. Therefore, it is possible to prevent a large external force from acting on the connecting portion 37. That is, when comparing the case where the connecting portion 37 is away from the guide through-hole 20 with the case where it is close to the guide through-hole 20, if the lead member 2 is displaced by the same amount in the guide through-hole 20, it acts on the connecting portion 37. The force is smaller in the case of being away than in the case of being near, and a large external force can be prevented from acting on the connecting portion 37. For this reason, it is possible to prevent the lead member 2 from coming off from the end face 1 at the connecting portion 37, and the quality of the product is improved. Furthermore, since the holding piece 16 for holding the capacitor element 3 accommodated in the case 4 is formed on the substrate 11, the capacitor element 3 can be supported by the substrate 11, and a stable resin filling operation can be performed. it can. Moreover, since the bottom wall 7 of the case 4 has an arc shape, the case 4 follows the outer shape of the capacitor element 3, and the amount of resin filling can be reduced. As a result, the cost can be reduced.

  Although the specific embodiment of the cased capacitor of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. It is. For example, when the engagement portion K is formed, the recess 24 may not be formed. In other words, the engaging portion K can be configured on the case inner surface 18 by a receiving piece for receiving the substrate 11 and a pressing piece for pressing the substrate 11 received by the receiving piece from the opening side. Thus, when not providing the recessed part 24, the engagement piece part 22 of the board | substrate 11 is omissible. Also, the length L of the guide through-hole 20 varies depending on the outer diameter size and material of the lead member 2, but can be variously changed within the range of the length so that the lead member 2 does not tilt. Furthermore, although the protruding part 21 which comprises the principal part of the through-hole 20 for guides protruded to the opening part 10 side in the said embodiment, it may protrude on the opposite opening part side conversely. Further, the bottom wall 7 of the case 4 does not need to be formed in an arc shape. Further, when the presser piece 16 is provided, the number is not limited to four as in the above embodiment, Increase or decrease is free.

It is a disassembled perspective view of embodiment of the capacitor | condenser with a case of this invention. It is a top view of the said capacitor | condenser with a case. It is a section front view of the above-mentioned cased capacitor. It is a cross-sectional side view of the above-mentioned cased capacitor. It is a principal part expanded sectional view of the said capacitor | condenser with a case. It is sectional drawing of the conventional capacitor | condenser with a case.

Explanation of symbols

  1 .... End face 2 .... Lead member 3 .... Capacitor element 4 .... Case 10 .... Opening part 11 .... Board 16 ... Pressing piece part 18 .... Inner case surface 20 .... Guide Through hole, 22 .. engaging piece part, 24 .. recessed part, 37 .. connecting part, K .. engaging part

Claims (5)

  A capacitor containing a capacitor element (3) having lead members (2) and (2) connected to both end faces (1) and (1) in a case (4) and filled with resin. ), In the vicinity of the opening (10), the substrate (11) having the protruding portions (21) and (21) is disposed, and the capacitor element (3) is provided in the protruding portions (21) and (21). ) Lead members (2) and (2) for guiding out through holes (20) and (20) are provided, and the substrate (11) is engaged and supported on the case inner surface (18). A capacitor with a case, wherein an engaging portion (K) is provided.   The case inner surface (18) facing the end surface (1) of the capacitor element (3) is provided with a recess (24) constituting the engagement portion (K), and the substrate (11) is provided with the recess (24). The case-containing capacitor according to claim 1, wherein an engagement piece portion (22) that engages with the capacitor is formed.   The connection part (37) of the lead member (2) to the end face (1) of the capacitor element (3) is provided on the case bottom side opposite to the opening side of the axis of the capacitor element (3). The case-containing capacitor according to claim 1 or 2.   The case-containing capacitor according to any one of claims 1 to 3, wherein a pressing piece (16) for pressing the capacitor element (3) accommodated in the case (4) is formed on the substrate (11).   5. The case-containing capacitor according to claim 1, wherein a length of the guide through hole (20) is equal to or greater than an outer diameter of the lead member (2).

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