JPH02146712A - Manufacture of inductance element and inductance element - Google Patents

Abstract

PURPOSE:To fix divided cores surely and make their electric characteristics stable by putting a roughly horizontal U-shaped stopper on a plate member having protrusions around both end parts on its upper face and inserting both ends of the divided cores between both legs of the stopper in a state that a drum part of the stopper is pressed between the protrusions and its both legs are extended outwards. CONSTITUTION:When an inductance element is manufactured in such a way that divided cores 38 are put between both legs of a stopper 30 which is formed into a roughly horizontal U-shaped stud, a plate member 18 having protrusions 22 around both end parts on its upper face and provided and the stopper 30 is put on the plate member 18 so that the lower face of a drum part 32 of the stopper 30 is put on the protrusions 22 of the plate member 18. Then both ends of the divided cores 38 are inserted between both leg parts 34 of the stopper 30 in a state that the drum part 32 of the stopper 30 is pressed between the protrusions 22 and both leg parts are extended outwards. For example, the foregoing plate member 18 is formed at a ceiling board of a casing 12 in a body as the base of a groove which is provided at a part of the ceiling board of the casing 12 and its casing 12 is equipped with a pressing part 28 to press the stopper 30.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing an inductance element and an inductance element, and more particularly to a method of manufacturing an inductance element and an inductance element in which a split core is sandwiched on both sides by, for example, fasteners.

[Prior art]

In this type of inductance element, in order to cover the split core with the stopper, for example, as shown in FIG. 3A,
A substantially U-shaped fastener 2 is placed on a split core 1 consisting of two U-shaped split cores, and both legs 3 of the fastener 2 are
and 4 respectively, and then both legs 3 and 4.
Alternatively, as shown in Fig. 3B, one leg 3 of the stopper 2 is hooked onto one end of the split core 1, and the other leg 4 is spread outward. There was a method of sandwiching it between the two.

[Problem to be solved by the invention]

However, in these conventional methods, the legs 3 and 4 may be unnecessarily widened to the extent that the elastic limit of the fastener 2 is exceeded. In this case, there is a problem in that the pressing force applied to the split core 1 becomes weak, and as a result, electrical characteristics such as inductance become unstable.

Therefore, the main object of the present invention is to provide a method for manufacturing an inductance element and an inductance element in which split cores are securely fixed and electrical characteristics are stable.

[Means for Solving the Problems] To put it simply, the first invention is a method for manufacturing an inductance element in which a split core is sandwiched from both ends by both legs of a substantially U-shaped fastener. Prepare a plate member with protrusions formed near both ends, place the fastener on the plate member so that the bottom surface of the body of the fastener rests on the protrusion of the plate member, and insert the fastener between the protrusions. This method of manufacturing an inductance element is characterized in that the torso of the clasp is held down, its legs are spread outward, and in this state, both ends of the split core are fitted between the legs of the fastener.

To put it simply, the second invention is an inductance element in which a split core is held between both legs of a substantially U-shaped stopper, in which projections are formed near both ends of the upper surface of the inductance element. The present invention is an inductance element characterized in that the split core is disposed on a flat plate member, and both ends of a split core are fitted between both legs of a fastener.

[Effect]

When the body of the fastener is pressed between the protrusions of the plate member, the body curves due to elastic deformation, and the legs formed by extending from both ends of the body extend outward by a certain width depending on the height of the protrusions. spread to In this state, both ends of the split core are placed between the legs of the fastener, and then the pressure on the body of the fastener is released. When this happens, the torso elastically restores itself and both legs try to return to their original state. The inward force of both legs at this time becomes a pressing force from both ends of the split core, and the split core is fixed integrally.

〔Effect of the invention〕

According to this invention, the spread width of both legs is uniquely determined by the height of the protrusion rather than the force pressing down on the torso, so it is possible to prevent the legs from spreading too much beyond the elastic limit of the fastener as in the conventional case. can. Therefore, the pressing force applied to the divided cores can be stably and reliably obtained, so that electrical characteristics such as inductance can be stabilized.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

〔Example〕

Referring to FIG. 1 and FIGS. 2A to 2D, an inductance element 10 of this embodiment is shown in a case 1 with an opening at the bottom.
Contains 2. The case 12 includes a rectangular ceiling plate 14 and four side walls 16, and in the longitudinal direction of the center of the ceiling plate 14 is a groove 18 having a width corresponding to the body portion 32 of a fastener 30, which will be described later.
is formed. Further, holes 20 are formed at both ends of the groove 18 through which the legs 34 of the stopper 30 can pass, and protrusions 22 are formed on the bottom surface of the groove 18 near both ends of the groove 18. In this way, the plate member 24 is formed integrally with the ceiling plate 14 of the case 12.

Note that the plate member 24 having such a protrusion is
2 may be formed separately.

In addition, each side wall 16 on both sides perpendicular to the extending direction of the groove 18 of the case 12 is shaded from a part of the ceiling plate 14.
A tab 26 is formed, thereby forming inwardly facing claw-like holding portions 28 near both ends of the groove 18, respectively. The holding part 28 prevents the stopper 30 placed on the groove 18 from coming off the groove 18.

On the groove 18 of the case 12 formed in this way, a second
As shown in Figure B, a substantially U-shaped fastener 30 is mounted. That is, the stopper 3 is placed on the protrusion 22 of the groove 18.
The stopper 30 is placed in the groove 18 so that the bottom surface of the body 32 of the
Two leg portions 34 are arranged at both ends of the groove 18 and extend downward from both ends of the body portion 32.
0 is inserted.

Thereafter, as shown in FIG. 2C, the body 32 of the fastener 30 is held between the protrusions 22, and the fastener 30 is held down using the protrusions 22 as a fulcrum.
Spread each leg 34 of 0 outward. That is, by pressing the trunk 32, it curves, and accordingly, the tips of the legs 34 extending from both ends of the trunk 32 are respectively displaced outward. At this time, the spread width of the leg portion 34 is uniquely determined by the height of the protrusion 22. That is,
Even if the pressing force on the body part 32 is too strong, the body part 32 will not fit into the groove 1.
8 and does not curve any further.

Therefore, it is reliably prevented that the leg portions 34 are spread too wide.

In this state, a split core 38 consisting of two U-shaped split cores each having a bobbin 36 wound with a coil (not shown), such as a common mode choke coil, is fitted into its legs, as shown in FIG. 2C.・Sea urchin, case 12
Insert inside. Then, both ends of the split core 38 are fitted between the legs 34 of the fastener 30 that has been opened first.

Thereafter, the pressing force on the body portion 32 of the stopper 30 is released. Then, the curvature of the trunk 32 is restored, and each leg 3
4 tries to return to its original state. At this time, the force acting inwardly on each leg 34 becomes a pressurizing force from both ends of the split core 38, and as a result, the split core 38 is compressed and securely integrated into one piece, as clearly seen in FIG. 2D. Fixed.

If the bobbin 36 is fixed within the case 12, the split core 38 will not come off the stopper 30.

Furthermore, in this embodiment, if an insulating material is used for the case 12, the distance between the coil (not shown) wound around the bobbin 36 and the stopper 30 can be shortened, which results in the miniaturization of the case I2 and the inductance element 10. Miniaturization can be achieved.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention. 2A to 2D are illustrative views sequentially showing the manufacturing method of this embodiment, FIG. 2A is an illustrative view showing the case, and FIG. 2B is an illustrative view showing the state in which the fastener is placed in the groove of the case. , FIG. 2C is an illustrative view showing a state in which the split core is fitted by pushing the body of the fastener, and FIG. 2D is an illustrative view showing a state in which the split core is sandwiched between the fasteners. FIGS. 3A and 3B are illustrative views showing the prior art. In the figure, 10 is an inductance element, 12 is a case, 14 is a ceiling plate, 18 is a groove, 20 is a hole, 22 is a protrusion, 2
4 is a plate member, 28 is a holding part, 30 is a fastener, 32 is a body part, 34 is a leg part, and 38 is a split core. Patent applicant Murata Manufacturing Co., Ltd. Representative Patent attorney Yama 1) Yoshito

Claims (1)

[Scope of Claims] 1. A method for manufacturing an inductance element in which a split core is sandwiched from both ends by both legs of a substantially U-shaped fastener, in which a plate member having protrusions formed near both ends of the upper surface of the inductance element is provided. Prepare the fastener, place the fastener on the plate member so that the lower surface of the body of the fastener rests on the protrusion of the plate member, and press the body of the fastener between the protrusions. Both legs are spread outward, and in that state, both ends of the split core are fitted between both legs of the fastener,
A method for manufacturing an inductance element. 2. In an inductance element in which a split core is sandwiched from both ends by both legs of a substantially U-shaped fastener, the fastener is arranged on a plate member having protrusions formed near both ends of the upper surface of the inductance element. . An inductance element, characterized in that both ends of a split core are fitted between both legs of the fastener. 3. The case further includes a case including a ceiling plate, wherein a groove having a width corresponding to the body of the fastener is formed in the ceiling plate of the case, and holes through which the legs can pass are formed at both ends of the groove. 3. The inductance element according to claim 2, wherein projections are formed near both ends of the bottom surface of the groove, so that the plate member is integrally formed with the ceiling plate of the case. 4. The inductance element according to claim 3, wherein the case includes presser portions formed near both ends of the groove and for pressing the stopper placed on the bottom surface of the groove.