JPH0310645Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to the structure of a coil device used in electronic equipment such as televisions and radios.

2. Description of the Related Art A coil device is fixed to a printed circuit board through terminals fixed to the board. However, when an external shock is applied, the coil section fluctuates, its inductance value changes, and the tuning frequency often deviates.

Conventionally, various improvements as described above have been made. FIG. 4 is given as one of the conventional examples. The same figure is a cross-sectional view of the coil device 1, and 2 in the figure is a terminal 3, 4, 5.
6 is a hollow bobbin which has a thread groove 6a inside, a coil winding 7 is wound outside, and a collar 6b and is inserted and supported by the board 2; 8 is a pot core that covers the bobbin 6; 9 Case covering crucible core 8, 1
0 is a movable core that is screwed into the thread groove 6a of the bobbin 6. Then attach the pot core 8 to the case 9 with adhesive 11
It is fixed at.

Problems to be Solved by the Invention According to the above configuration, the pot core 8 constituting the coil part is securely fixed to the case 9, but the adhesive 11
There is also the problem that the number of bonding steps increases.

An object of the present invention is to provide a coil device that solves the above problems.

Means for Solving the Problems The present invention involves forming a taper by slanting the opposing inner surfaces of the case that covers the coil part, press-fitting the coil part between the tapers, and fixing the coil part to the case. The structure is as follows.

Function: This configuration prevents the inductance from shifting due to external impact, eliminates the need for an increase in parts and work for fixing the coil portion, and improves productivity.

Embodiment FIG. 1 is a sectional view showing a first embodiment of a coil device 21 according to the present invention. In the figure, reference numeral 22 indicates a through hole 22 for fixing takeout terminals 23 to 25 of the coil winding.
a, an insulating substrate with protrusions 23b and 23c having different shapes on the lower surface; 26, a screw groove 26 inside;
a, a collar 26b forming a winding part for winding the coil winding 27 on the outside, and a through hole 22 of the substrate 22 on the lower side;
28 is a hollow, cylindrical bobbin made of thermoplastic resin having a locking part 26c penetrating through a, and a stopper part 26d with which the board 22 comes into contact;
29 is a rectangular metal shield having an engaging protrusion 29a that engages with the substrate 22, an opening 29b on the ceiling, tapes 29c, 29d on the sides, and ground terminals 29e, 29f. The case 30 is a movable core made of a magnetic material that is screwed into the thread groove 26a of the bobbin 26 to adjust the inductance. The inner surface of the case 29 is inclined upward in the drawing, and the upper side is gradually narrower than the lower side. Therefore, when inserting the pot core 28 from the lower opening side of the case 28, a gap with the side surface of the case 29 is ensured to facilitate insertion, and after insertion, the pot core is held between the opposing tapers 29c and 29d. 28 is fixed to the case 29 and integrated. Note that the tapers 29c and 29d are the case 29.
It is formed by partially modifying the processing mold.

FIG. 2 is a sectional view showing a second embodiment of the coil device 31 according to the present invention. Portions corresponding to those in FIG. 1 are given the same reference numerals, and detailed explanations will be omitted. In this embodiment, the vase core 28 is held in a core holder 32 made of resin and having a flat square shape. This holder 32 is attached to the taper 29 of the case 29.
c and 29d and are held between them, and eventually the pot core 28 and holder 32 are integrated with the case 29. In the case of the first embodiment described above, a protrusion 26f is provided at the end of the collar 26e of the bobbin 26, and the protrusion 26f contacts the inner surface of the pot core 28 to fix the pot core 28. making it even stronger.

FIG. 3 is a sectional view showing a third embodiment of the coil device 41 according to the present invention. Parts corresponding to those in FIG. 1 are given the same reference numerals. In this embodiment, a bobbin 26 having a relatively large height is fixed to a case 29. Here again, the ends of the collar 26b of the bobbin 26 come into contact with the tapers 29c, 29d of the case 29 and are press-fitted, so that the bobbin 26 is integrated with the case 29.

As described above, according to the coil device of the present invention, the coil part such as the pot core, core holder, or bobbin is press-fitted into the taper formed on the inner surface of the case, and the case and the coil part are integrated, so that external shocks can be avoided. This prevents inductance deviation caused by
Further, there is an advantage that there is no increase in the number of parts and work steps for fixing the coil portion, and productivity is improved.

[Brief explanation of the drawing]

1 to 3 show a coil device according to the present invention. FIG. 1 is a sectional view of the first embodiment, FIG. 2 is a sectional view of the second embodiment, and FIG. 3 is a sectional view of the third embodiment. An example cross-sectional view, FIG. 4, is a cross-sectional view of a conventional coil device. 1, 21, 31, 41...Coil device, 2, 2
2...Substrate, 26...Bobbin, 28...Vase core, 29...Case, 29c, 29d...Taper, 32...Holder.

Claims (1)

[Claims for Utility Model Registration] (1) In a coil device comprising a coil section provided on a substrate and a case covering the coil section, opposing inner surfaces of the case are inclined to form a taper, and the taper A coil device characterized in that the coil part is fixed to the case by press-fitting the coil part between the cases. (2) In claim (1) for utility model registration, the coil portion is a pot core that covers a coil bobbin. (3) In claim (1) of the utility model registration, the coil portion is a holder that holds the vase core. (4) In claim (1) for utility model registration, the coil portion is a coil bobbin around which a coil winding is wound.