JPS583294Y2 - Feedthrough ceramic capacitor - Google Patents

Description

[Detailed Description of the Invention] This invention relates to the improvement of feed-through ceramic capacitors used for noise prevention in radios, stereos, motors, etc., and bypass circuits in FM, television tuners, etc.

Conventionally, through-type ceramic capacitors have used a tubular dielectric body with an inner thin-film terminal on the inner hole surface and an outer thin-film terminal on the outer circumferential surface of the capacitor. It is known that when attaching a lead wire to the head of the nail-shaped inner terminal and the tip on the opposite side, the lead wire is attached to the circular flat plate surface of the nail-shaped head and the round bar-shaped tip. It had the disadvantage that it could not be made strong and could easily break.

Furthermore, since the internal terminal has a large heat capacity, it takes time for the temperature to rise during soldering, resulting in an extension of the working time.

Furthermore, when a large number of nail-shaped internal terminals are used, the weight of the printed circuit board increases and its strength may be weakened.

. The purpose of this invention is to solve the above-mentioned conventional problems, and to replace the nail-shaped inner terminal with a lower strength, and to obtain another inner terminal that allows the lead wire to be firmly attached. It is.

Another purpose is to reduce the weight of the terminal to prevent the strength of the printed circuit board from deteriorating, and to shorten the soldering time and improve work efficiency.

This invention will be explained with reference to the accompanying drawings. An inner thin film terminal 1 is fitted into the inner thin film terminal 2b of a ceramic capacitor 3, which has an outer thin film terminal 2a1 on the outer surface of a tubular dielectric body and an inner thin film terminal 2b on the inner surface thereof, with good electrical contact. Further, a flange-shaped outer terminal 2 is provided on the outer thin film terminal 2a to constitute a through-type ceramic capacitor.

The internal terminals 1 are attached to both ends of a horizontal plate 6, which corresponds to the head of the T-shaped metal plate 5 shown in FIG. 6, which is cut out from a thin metal plate.
For example, by providing arc-shaped notches 1a, 1a and making a substantially circular hole 1b in the center, and then bending the horizontal plate 6 symmetrically so as to overlap at the center, as shown in FIGS. 2 and 3, form into something.

Therefore, the section marked by ■-■ in Fig. 2 has a roughly U-shaped gutter-like cross section as shown in Fig. 5, and when its head is viewed from the left side of Fig. 2, it becomes as shown in Fig. 4. .

Reference numeral 8 denotes a metal wall such as a casing to which a through-type ceramic capacitor is attached, to which a flange-shaped external terminal 2 can be soldered.

FIG. 7 shows a conventional through-type ceramic capacitor using a nail-shaped inner surface terminal 4 having a nail head 4a.

Since the present invention has the above-described structure, the radial recesses formed by the arc-shaped notches 1a, 1a provided on the head of the inner terminal 1 and the radial recesses formed by the curved hole 1b have free directions. By winding the lead wire extending from the inner surface perpendicularly to the inner surface terminal, inserting the lead wire into the curved hole 1b and winding it, or inserting the lead wire into the horizontal bottom part 1c and caulking it. An extremely strong lead wire mounting portion can be constructed, and by soldering it becomes even more solid, making it difficult for the lead wire to break.

Since the internal terminal of this invention is cut out from a thin metal plate and shaped into a gutter, there is no decrease in mechanical strength compared to nail-shaped terminals, and the heat capacity during soldering is small and the temperature rises quickly.
When conveying printed circuit boards on a conveyor, etc., time can be significantly reduced and work efficiency can be increased.Furthermore, since the shape of the inner terminal is linear, it is easy for the solder to enter the soldering part, making it strong. Can be soldered.

Furthermore, since it is light in weight, it is possible to prevent damage to the board to which a large number of through-type ceramic capacitors and through-type insulated terminals are attached, especially when used in vibrating equipment.

That is, the inner surface terminal of the present invention is not limited to a through-type ceramic capacitor, but can of course be applied to a through-type insulated terminal using an insulator mainly having insulating properties.

Further, since the T-shaped metal plate is processed to form the head into a square shape and then assembled into the condenser, there is no need to particularly process the head after assembly.

Therefore, there is no problem of damage to the capacitor due to processing after assembly.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an embodiment of the present invention, Fig. 2 is an enlarged plan view of a portion of Fig. 1, Fig. 3 is a side view of the same, Fig. 4 is a front view of the improvement, and Fig. 5 is an enlarged plan view of a portion of Fig. 1. A cross-sectional view of the V-■ line section in Figure 2,
FIG. 6 is a diagram of a T-shaped metal plate, and FIG. 7 is a sectional view of a conventional example. 1...Inner terminal, 1a...Notch, 1b
...hole, 3...porcelain capacitor, 5.
...Metal plate.

Claims (1)

[Scope of utility model registration request] In a through-type ceramic capacitor in which an inner surface terminal is fitted into the inner hole of a tubular ceramic capacitor 3, the inner surface terminal is formed of a substantially T-shaped metal plate, and the central part of the horizontal plate of the head of the T-shaped metal plate is A hole 1b is provided at both ends of the horizontal plate 6, and a notch 1a is provided at both ends of the horizontal plate 6.
. A through-type porcelain capacitor formed to a size that can fit into the inner hole of.