JPH0351931Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a chiyoke coil used in a noise filter circuit or a power supply smoothing circuit mounted on a wiring board of an electronic device.

Conventional technology A chiyoke coil in which a wire is wound around a ring-shaped magnetic core and subjected to insulation treatment generates heat due to the superimposed direct current, so the change in inductance value is saturated at a constant current value, and when the current value is large, the change in inductance value is saturated. It tends not to maintain a sufficient value up to the area. Therefore, in order to obtain a sufficient inductance value, a part of the annular magnetic core is cut out in the radial direction, and a gap is provided in a part of the magnetic circuit.A chi-yoke coil is used as a noise filter. It is also used in power supply smoothing circuits. Conventionally, when this type of chiyoke coil is fixedly mounted on a wiring board with its diametrical direction perpendicular to the wiring board, the outer periphery of the coil is fixed to the board with adhesive or silicone resin, and the lead wire from the winding is fixed to the board. The wire is connected to the wiring on the back side of the board through the through-hole of the board to fix the chiyoke coil on the board.

Problems that the invention aims to solve: Adhesive is used to fix these chiyoke coils to the board, so it takes time for the adhesive to harden. Since the position is not constant, there is a drawback that work efficiency is low and it requires a lot of man-hours, such as insertion into a through hole of a board. Furthermore, depending on the type of adhesive, there are drawbacks such as the need for safety measures such as providing ventilation equipment to prevent the generation of volatile gases.

Means for Solving the Problems The present invention solves the above drawbacks of the conventional method by cutting a coil in which a winding wire is wound around a C-shaped magnetic core that forms a gap in which a part of the annular magnetic core is cut out in the radial direction. A pair of elastic pieces extend outward from the upper end of a cubic base that supports the center hole of the magnetic core by holding the end faces, and an arrow-shaped curvature protrudes outward from the lower side of the protruding piece that protrudes from the lower end. A support member integrally molded from a flexible electrical insulating material, and a heat-resistant support member with a plurality of pin terminals protruding from the bottom surface and a through hole in the center into which the protruding piece of the support member is inserted. The projecting piece of the support member is inserted into the through hole of the terminal block, and the elastic piece of the support member is inserted into the terminal block.
This is a chiyoke coil for mounting on a board, which has a wire wound around a shaped magnetic core and is held in a hole in the center of the coil.

Function: The elastic contact piece on the base of the coil support member holds the central hole, and the protruding piece can be fitted into the through hole of the terminal block to combine and fix the coil and terminal block, especially when using adhesive. The terminal block and the coil are fixed without any twisting.

Embodiment As shown in FIGS. 1 and 2, the embodiment of the chiyoke coil of the present invention is such that a C-shaped magnetic core 2 having a notch 3 as a magnetic gap is coated with insulating paint, and then a central hole 4 is applied from above. The coil 1 is formed by winding the winding 5 through the coil. A pedestal part 7 that is cubic and has a width substantially the same as the gap between the notches 3 and is sufficiently higher than the radial dimension of the notch 3 and is fitted into the notch 3, and a flexible thin plate that opens laterally on the upper surface. Elastic piece 8
and an arrow-shaped curved part 10 that is a narrow prismatic piece that is formed toward the bottom of the base part 7 and protrudes in the width direction at both edges in the length direction of the lower end. A coil support member 6 is formed by integrally molding an electrically insulating material. The elastic pieces 8 are curved inwardly near the base, placed back to back, and curved outwardly at the top so that the free ends extend horizontally and outwardly at the required height dimension. The reason why they are formed back to back is to accommodate the fact that when the number of turns of the winding is large, the inner diameter of the center hole 4 of the coil 1 becomes smaller than the interval between the notches 3, so the distance between the free end surfaces is adjusted to the center hole of the magnetic core 2. Set it slightly larger than the inner diameter of section 4.

In addition, there are multiple pin terminals 12 on the bottom of the rectangular base plate.
A terminal block 11 is formed by molding a heat-resistant electrically insulating material such as phenolic resin with a rectangular through hole 13 inserted in the center of the upper surface to fit with the protruding piece 9 of the coil support member 6. Ru. A locking step portion 14 is provided in the middle of the inner wall surface of the through hole 13, which expands on both sides in a direction parallel to the long side.

Now, as shown in Figure 2, cutout 3 of coil 1
The coil 1 and the coil support member 6 are assembled by fitting the elastic piece 8 of the coil support member 6 into the center portion 4 while squeezing it upward in an arc shape. Next, the protruding piece 9 of the coil support member 6 is inserted into the through hole 13 of the terminal block 11, the warped part 10 is engaged with the locking step part 14, and the coil support member 6 and the terminal block 11 are combined. Furthermore, the end of the lead wire of the coil 1 is wound around the pin terminal 12, and the bottom of the terminal block 11 is immersed in a solder bath and connected by soldering, thereby assembling a chiyoke coil.

In another embodiment of the coil supporting member 6 used in the chiyoke coil of the present invention, as shown in FIG. is laid down horizontally and molded integrally on the stand 7. Therefore, this elastic piece 8
is fitted into the central hole 4 of the coil 1 while being compressed and reduced.

Effects of the invention As described above, according to the invention, the coil support member 6 is elastic, so even if the number of turns of the winding 5 of the coil 1 is different and the size and shape of the central hole 4 are different, By deforming and compressing the elastic piece and press-fitting it into the central hole 4, the coil 1, coil support member 6, and terminal block 11 can be easily assembled. In addition, since the terminal block 11 is made of a heat-resistant electrical insulating material, there is no problem even if it is immersed in a solder bath during soldering.
Since no adhesive is used, there is no harm to the environment such as generation of gas.

[Brief explanation of the drawing]

Fig. 1 is an exploded external perspective view of an embodiment of the Chi-yoke coil of the present invention, Fig. 2 is an external front view of the Chi-yoke coil of the present invention, and Fig. 3 is another embodiment of the coil support member used in the present invention. It is an external perspective view. In the figure, 1...coil, 2...magnetic core,
3... Notch, 4... Center hole, 5... Winding wire,
6... Coil support member, 7... Base, 8... Elastic piece, 9... Projecting piece, 11... Terminal block, 12... Pin terminal, 13... Through hole.

Claims (1)

[Scope of utility model registration request] A coil 1 in which a winding 5 is wound around a C-shaped magnetic core 2 in which a part of the annular magnetic core is cut out in the radial direction by a notch 3 is placed on a wiring board so that the diametrical direction of the annular magnetic core is perpendicular to the board. In a chiyoke coil that is mounted as a
A cubic protruding piece 9 that fits into the through hole 13 of a terminal block 11 made of a heat-resistant electrical insulating material with a rectangular through hole 13 formed in the center and a rectangular through hole 13 inserted therein. It is integrally molded from a flexible electrical insulating material, and a flexible elastic piece 8 made of a thin plate or an elastic piece 8 made of a cylindrical foam material is integrally provided on the upper surface of the platform 7. The coil supporting member 6 is used to hold the coil 1 by inserting the elastic piece 8 into the central hole 4 of the magnetic core 2.