JPH0427157Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a through-type ceramic capacitor that is soldered and attached to, for example, a chassis.

[Prior Art] A conventional example of a feed-through ceramic capacitor will be explained with reference to FIGS. 5 and 6. For example, the capacitor consists of a lead wire 16, a capacitor body 11, and beads 15. The lead wire 16 is provided with a collar 17 for positioning the capacitor body 11 and a protrusion 18 for preventing the bead 15 from coming off in the center.

The capacitor main body 11 has, for example, a disc-shaped dielectric element 12 provided with a through hole for inserting the lead wire 16, and one surface of the element (the upper surface in FIGS. 5 and 6). ) and near the outer periphery of the other surface, electrodes 1 are insulated from each other.
3 and 14 are formed respectively.

The beads 15 are generally made of insulating resin and are provided with through holes for inserting lead wires 16. In the feed-through type ceramic capacitor, the lead wire 16 is passed through the through hole of the capacitor body 11, the capacitor body 11 is placed between the collar 17 of the lead wire 16 and the protrusion 18, and the through hole of the bead 15 is inserted into the protrusion 18. Fit and press fit.

The bead 15 has the role of supporting the capacitor main body 11 by sandwiching it between the collar 17 of the lead wire, but the protrusion 18 for stopping the bead has conventionally not been very large, and the deformation during fitting causes the outer periphery of the bead to It wasn't even that big of a deal.

Such a feedthrough ceramic capacitor is, for example,
As shown in FIGS. 3 and 4, the bead 15 side is inserted into the through hole of the shear a, and the bead 15 is introduced into a reflow soldering tank while being kept in a horizontal state, and soldered.

[Problem to be solved by the invention] In the above-mentioned conventional technology, even if the feedthrough ceramic capacitor is mounted in the vertical direction as shown in FIGS. 3 and 4, the beads and chassis forming the feedthrough ceramic capacitor are Since the fitted state is loose, when the chassis a is tilted, the through-type ceramic capacitor tends to come off from the through hole as shown by the arrow in FIG. 4. For this reason, in the above soldering process, it is necessary to maintain the horizontal state and introduce the solder into the reflow soldering bath several times, or to solder it in a flat state at once and then bend it or assemble it and make it into a chassis, etc. I had no choice but to find a way.

However, these methods are extremely troublesome as they increase the number of man-hours, and are an obstacle to increasing productivity.

Therefore, in view of the above problems, the purpose of this invention is to
The object of the present invention is to provide a feedthrough ceramic capacitor that can solve these problems.

[Means for Solving the Problems] In order to achieve the above object, the present invention is provided with a collar 17 for positioning the capacitor body 11 and a protrusion 18 for preventing the bead 15 from coming off in the center. Electrodes 13 and 14 insulated from each other are formed on one surface and the other surface of a dielectric element 12 provided with a lead wire 16 and a through hole into which the lead wire 16 is inserted. The electrode 13 formed on the protrusion 1 of the collar 17 of the lead wire 16
The capacitor main body 11 is penetrated by the lead wire 16 so as to be in contact with the 8 side, and a through hole into which the lead wire 16 is inserted is provided, and the protrusion 18 of the lead wire 16 comes into contact with the inner peripheral surface of the through hole. A bead 1 is penetrated to fix the capacitor body 11 as shown in FIG.
5, a projection 1 provided on the lead wire 16 to prevent it from coming off;
8 provides a through-type ceramic capacitor characterized in that beads 15 are deformed so as to partially widen the outer diameter.

[Function] In the feedthrough ceramic capacitor according to the present invention,
The outer diameter of the bead 15 is enlarged and deformed by the protrusion 18 provided on the lead wire 16, and the outer diameter of the bead 15 is partially thickened. If you press fit into the through hole of the shear a which is slightly thicker than the diameter,
The expanded and deformed outer circumferential portion of the bead 15 acts as a stopper, making it difficult for the through-type ceramic capacitor to come off from the through hole of the sheath a.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2.

In FIGS. 1 and 2, the same parts as those in FIGS. 5 and 6 already described are given the same reference numbers. In the present invention, in such a feedthrough type ceramic capacitor, the bead 1 of the lead wire 16 is
The protrusion 18 for fixing the bead 5 is formed larger than that of a conventional lead wire as the outer diameter of the bead 15 changes. Then, the lead wire is passed through the capacitor main body in which electrodes are formed around the through hole on one main surface of the dielectric element on a disk provided with the through hole and on the outer periphery of the other main surface. Thereafter, the bead 15 is press-fitted until the protrusion 18 of the lead wire 16 reaches the middle part of the through hole of the bead 15, thereby fixing the capacitor body. Then, the beads 1 are removed by the protrusion 18.
Since an external force is applied from the inside of the through hole 5, the bead 15 is deformed so that the outer diameter of the middle portion of the bead 15 is expanded.

Although the illustrated projection 18 is formed by crushing a portion of the lead wire 16, it may be in the shape of a collar, for example.

Further, although the position of the protrusion 18 was at the center of the through hole of the bead 15 according to this embodiment, the position of the protrusion 18 is not limited to the center of the through hole, but may be closer to the end of the through hole of the bead 15. Similar effects can be obtained even if the protrusion 18 is located at that position.

Further, the shape of the dielectric element used in the capacitor body is not limited to a disk, but may be a cylinder with a long axis.

This through-type porcelain capacitor is made by temporarily fixing the chassis a into the through hole as described above, so that the vertical and horizontal pieces of the chassis a are bent into an L shape as shown in FIGS. 3 and 4, for example. Can be temporarily fixed. Then, the pieces can be introduced into a reflow soldering bath as they are, and the through-hole ceramic capacitors temporarily attached to each piece can be sequentially soldered.

Note that the object to which this through-type ceramic capacitor is mounted and soldered is not limited to the chassis as described above, but may also be a circuit wiring board.

[Effects of the Invention] As can be seen from the above description, according to the present invention, beads of a through-type ceramic capacitor can be easily prevented from coming off by simply press-fitting them into a through-hole of a chassis or the like. For this reason, the feed-through ceramic capacitor does not fall off from the chassis etc. even if it is oriented at any angle, so it is possible to achieve the effect that soldering to the chassis etc. can be done in one go, which can be done efficiently. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the feed-through ceramic capacitor according to the present invention, FIG. 2 is a sectional view showing an embodiment of the feed-through ceramic capacitor according to the present invention, and FIGS. 3 and 4 are vertical views. A perspective view and a cross-sectional view showing a through-type ceramic capacitor mounted on a chassis, which requires soldering in both directions, FIG. 5 is a perspective view showing a conventional example, and FIG. 6 is a cross-sectional view showing a conventional example. It is. 11... Capacitor body, 12... Dielectric element, 13, 14... Electrode, 15... Bead, 16
... Lead wire, 17 ... Lead wire tsuba, 18 ...
Protrusion of lead wire.

Claims (1)

[Scope of utility model registration request] One side of the dielectric body has a lead wire provided with a collar for positioning the capacitor body in the center and a protrusion to prevent beads from coming off, and a through hole into which the lead wire is inserted. A capacitor body having mutually insulated electrodes formed on one surface and the other surface and penetrated by the lead wire such that the electrode formed on one surface contacts the protruding side of the collar of the lead wire, and a lead wire. In a feed-through ceramic capacitor, the lead wire is provided with a through hole into which the lead wire is inserted, and a bead that is penetrated so that the protrusion of the lead wire comes into contact with the inner peripheral surface of the through hole to fix the capacitor body. A through-type porcelain capacitor characterized in that the outer diameter of a bead is deformed so as to partially widen by a protrusion to prevent the bead from coming off.