KR830000034Y1 - Shield case with capacitor - Google Patents

Abstract

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Description

Shield case with capacitor

1 is a portion of the shield case used with a conventional antenna terminal plate useful in the present invention.

2 is a schematic diagram showing electrical connection of various components included in the antenna terminal plate.

Figure 3a is a left side view of one example of a shield case used in the present invention.

3B is a front view of a partial cross section of the shield case of FIG. 3A.

3c is a right side view of the shield case of FIG. 3a.

3d is a bottom view of the shield case of FIG. 3a.

Figure 4a is a left side view of a through-type device including a donut shaped dielectric unit used in the present invention.

4b is a front cross-sectional view of the dielectric unit.

4c is a right side view of the dielectric unit.

5 is a schematic view of the through-type RC device of FIG.

6A is a front view of a partial cross section of an example of a through conductor used in the present invention.

FIG. 6B is a left side view of the through conductor of FIG. 6A. FIG.

FIG. 6C is a right side view of the through conductor of FIG. 6A. FIG.

7 is a capacitor assembled using the various components shown in FIGS. 3a, 3b, 3c, 4a, 4b, 4c, 6a, 6b, and 6c. Cross section of one example of an attached shield case.

8 is a left side view of another example of a through-type RC device used in the present invention.

FIG. 8B is a front sectional view of the donut type dielectric unit of the apparatus of FIG. 8A.

FIG. 8C is a right side view of the donut type dielectric unit of the apparatus of FIG. 8A.

9 is a front view of a partial cross section for another example of the through conductor used in the present invention.

10 is a cross-sectional view of another example of a shield case used in the present invention.

The present invention relates to a shield case to which a capacitor is attached. In particular, the present invention relates to a shield case with a capacitor attached for use with an antenna terminal plate of a television receiver.

In television receivers, for example, 75 kHz coaxial cable is used to connect the antenna and the tuner circuit. In order to connect such coaxial cable from the antenna to the tuner, an antenna terminal plate is used. Such antenna terminal boards are shielded for the purpose of preventing interference caused by electric waves and reflected waves entering a path other than the antenna.

1 is a partial view showing a part of a conventional antenna terminal plate constituting the background of the present invention. Referring to FIG. 1, for example, a 75 kHz coaxial cable connected from an antenna (not shown) is connected to a coaxial cable connector receptacle, while a coaxial cable connected by a tuner (not shown) is connected to a jack (16). Combined. The connector receptacle 4 is fixed to the hole of the insulating board 1 by a flange 5 provided on its outer surface.

The connector receptacle 4 consists of a terminal 6 for connecting to the center conductor of the coaxial cable and the outer conductor of the coaxial cable is connected to the connector receptacle 4. The through capacitor is filled by a nut 13, a deformed washer 12 and a spring washer 11 on top of the connector receptacle 4. The through capacitor is composed of an inner electrode connection 7, a capacitor unit 8 and an outer electrode connection 9. The capacitor unit 8 is formed of an inner electrode 81 on its upper surface and an outer electrode 82 on its lower surface. The electrode 81 and the connecting portion 7 are in contact with each other, and the connecting portion 9 of the electrode 82 is in contact with each other. Therefore, the capacitor unit 8 has a capacitance between the connecting portion 7 as the electrode 81 and the connecting portion 9 as the electrode 82. The through capacitor is also filled with resin material 10 between the two connections 7 and 9. That is, cast into resin. A shield case 2 is provided on the insulating substrate 1 to surround the connector receptacle and the through capacitor. The above-described jack 16 is installed on the side wall of the shield case 2. The shielding lid 3 is placed on the top opening of the shield case 2. The composite RC device 15 is connected between the terminal 17 of the jack 16 and the terminal 6 of the connector receptacle 4.

An individual resistor 14 is connected between the ear portion of the eared washer 12 and the shield case 2. 2 is a schematic diagram of the antenna terminal plate of FIG. As is well known, the composite RC device 15 is installed for the purpose of lightning protection and the composite RC device 15 is provided with a discharge gap 15G for that purpose. The capacitance C of the through capacitor and the resistance R of the resistor 14 are connected in parallel. This configuration of the antenna terminal plate is known to those skilled in this aspect, and its detailed description is omitted.

As shown in FIG. 1, the conventional antenna terminal plate is composed of a shield case 2 composed of a separate component from the outer electrode connection portion of the through capacitor, and the electrode connection portion 9 and the shield case 2 are separated from each other. When assembling it requires a step to connect by some process. Thus, special components and assembly steps are required, resulting in an increase in price. Moreover, since the desired connection is made by the spring washer 11, there has been a disadvantage in that the electrical contact tends to be poor. In addition, in the conventional one of FIG. 1, the resistor 14 is also prepared as a separate component and properly connected during assembly. Therefore, the number of discrete resistors has increased and thus the number of connection stages has increased.

The capacitor-attached shield case according to the present invention is basically a shield case made of an electrically conductive material having at least two openings, a capacitor fitted in the shield case and having a donut-type dielectric unit, a donut-type dielectric unit and a seal. And a shielding lid made of an electrically conductive material for covering the other opening of the shield case and the through conductor inserted into one of the openings of the hard case. The shield case is generally formed of a flat, nearly annular capacitor fixture in the vicinity of an opening, and a capacitor with a donut-shaped dielectric unit is placed therein and fixed. The through-conductor is formed at the end by a flange part and placed inside the case, so that a capacitor is inserted between the flange part and the fixing part.

In a preferred embodiment of the present invention, the capacitor is formed with one electrode on one major surface of the donut type dielectric unit and the other electrode on another major surface of the dielectric unit. The capacitor also has a lead electrode formed on another major surface around the hole of the dielectric unit, so that a resistance element is connected between the lead electrode and the other electrode.

One electrode and the through conductor are connected by the flange portion, while the lead electrode and the through conductor are connected.

According to a preferred embodiment of the present invention, the shield case to which the capacitor is attached is supplied to significantly reduce the number of components and thus reduce the number of assembly steps. Thus, such a shield case is supplied at a very low price compared to the price of a conventional shield case. The capacitor and the shield case containing the donut-type dielectric unit are electrically connected directly and mechanically fixed, thereby making reliable contact. Moreover, the impedance at high frequencies due to the stray capacitance is reduced, so that the shielding effect of the inherent function of the shield case is fully achieved.

In the embodiment of the present invention, since the resistor element is formed with a capacitor, there is no need for a separate resistor element, thus eliminating the need for an assembly step.

In an embodiment of the present invention, the fixing portion of the shield case, that is, the surface contacting the donut type dielectric unit is provided with a plurality of protrusions. As a result, a large amount of electrically conductive material, such as solder, enters between the unit and the capacitor and the shield case. The material sandwiched between the dielectric unit such as solder and the shield case is used to absorb the pressure generated by the difference in their expansion coefficients, thereby preventing the dielectric unit from cracking and the like.

Therefore, the main object of the present invention is to provide an improved capacitor attached shield case.

It is yet another object of the present invention to provide a shield case with a capacitor in which the number of component elements is reduced and the assembly step is reduced accordingly.

Another object is to provide a shielded case with a capacitor with improved and stable shielding effect, and a shield case with an improved capacitor, among others.

These objects and their aspects, features will become more apparent in connection with the accompanying drawings from the following detailed description of the invention. 3A, 3B, 3C, and 3D show a left side view, a front view, a right side view, and a bottom view, respectively, of a partial cross section of the shield case 200 used in the present invention. The seal case 200 is manufactured by drawing an iron plate. The case 200 has a rectangular cross section of the case portion and is formed with openings 201 and 203 at both ends. The case 200 is also structured such that the opening 201 is formed by the protruding corner 202 formed such that the edge of the case 200 is bent to the outside. The opening 203 is formed by the edge of the side 204 of the case 200.

The end edge of the opening 203 of the side surface 204 is formed with a rib 205 for fixing the shielding lid to be described later. The shield case 200 is also formed with a flat and annular capacitor housing 207 at the end of the case in which the opening 201 is formed. The capacitor accommodating part 207 is comprised by the part which arrange | positions a capacitor adjacently, including the donut type dielectric unit mentioned later, not shown in FIGS. 3A, 3B, and 3C. Receiving portion 207 is formed on the surface where a plurality of protrusions 207a are disposed adjacent to each other with the capacitor. The portion accommodating the capacitor receiving portion 207 and the side surface 204 is formed by a rounded curved portion 206 with a gentle curve to facilitate the drawing operation of the case 200. A fixing hole 208 is formed in one side 204 to fix the coaxial cable connector receptacle, which will be described later.

4A, 4B and 4C are left side, front and right side views, respectively, of a partial cross section of a through-type RC device containing a donut type dielectric unit used in the present invention. The flow-through RC device 300 is consistent with the RC parallel circuit shown in FIG. The dielectric unit 301 is made of, for example, a ceramic and is formed in a flat donut shape. The hole 302 of the unit 301 is used for insertion of the through conductor or the connecting portion to be described later. Dielectric unit 301 is separated on one major surface of unit 301 to form electrodes 303 and 304 with a concentrated bottom. The electrodes 303 and 304 used as the drawing electrodes are connected by the resistor 14 of FIG. 1 and the resistance member 305 corresponding to the resistor R of FIG. The resistance members 305 as well as the electrodes 303 and 304 may be formed by, for example, printing. The dielectric unit 301 may be formed with another electrode 306 on another major surface.

The electrode 306 is formed of the removal portion 307 that is separated as necessary to the extent that it does not affect the electrical performance. By forming the removal portion 307, it is possible to save the electrode material. As long as mechanical strength is acceptable, the removal portion of the electrode may be made large.

5 shows a schematic diagram of such a through-type RC device 300. In particular, the device 300 includes a capacitance C and a resistance formed by electrodes 303, 304 and 306 and a dielectric unit 301 sandwiching the electrodes between 303, 304 and 306. It consists of a resistor R formed by the member 305. As described below, the electrodes 304 and 306 are electrically connected by, for example, solder supplied through the inner wall of the hole 302 of the dielectric unit 301 to act as a single electrode.

6A, 6B and 6C show a front view, a left side view, and a right side view, respectively, for a partial cross section of an example of the through conductor used in the present invention. The through conductor 100 is structured in a cylinder to form a cylindrical portion. The conductor 100 has a flange portion 102 formed at one end of the cylindrical portion 101 in contact with the electrode 306 (FIG. 4) formed on the dielectric unit 301 described above. The flange portion 102 is also formed with raised portions 103 raised around it. The through-conductor 100 shown in FIG. 6A, 6B, and 6C is comprised in the following shape.

In particular, the flange portion 102 is formed on the upper surface of the flange 102 to which a plurality of protrusions 104 are to be contacted by the electrode 306 of the through-RC device 300. At the same time, a plurality of ribs 105 are formed in the area along the central hole of the dielectric unit 301 of the cylindrical portion 101. These ribs 105 are selected to be longer than the thickness of the minimum dielectric unit 301. The other end 106 of the cylindrical portion 101 is chosen to have a diameter smaller than the cylindrical portion 101 so that it is approximately equal to the outer diameter of the inner insulator of the coaxial cable, not shown, in which the other end 106 is inserted therein. .

7 is a cross-sectional view showing a part of an antenna terminal plate according to the embodiment of the present invention. As shown in FIG. 7, the illustrated shielded case with the capacitor is shown in FIGS. 3A, 3B, 3C, and 3D with the shield case 200 shown in FIGS. 3A, 4A, and 4B. And a through-type RC device shown in FIG. 4C and a through conductor 100 shown in FIGS. 6A, 6B, and 6C.

Initially, an annular solder (not shown) is placed in the capacitor housing 207 of the shield case 200 and then the through-RC device 300 is placed thereon so that the electrode 303 of the dielectric unit 301 is numbered. Towards payment 207. Thus, the electrode 306 of the through RC device 300 faces the shielding lid 210. Another unshown annular solder whose diameter is smaller than the diameter of the annular solder placed between the receiving portion 207 and the apparatus 300 described above is the flange portion of the through conductor 100 on the electrode 306 of the apparatus 300. It is placed in a position in contact with 102. The through conductor 100 is installed to be inserted through the hole 302 of the through-type RC device 300 and through the dielectric unit 301 and the opening 201 of the shield case 200.

In this case, the through conductor 100 is inserted into the center hole 302 of the dielectric unit 301 in the direction shown in FIG. The cylindrical portion 101 is then properly positioned with respect to the center hole 302. That is, the plurality of ribs formed on the cylindrical portion 101 of the through-conductor 100 is positioned in a straight line with the center line by the action of the 105.

Thus, the shield case 200, the annular solder (not shown), another annular solder not shown, and the through conductor 100 are positioned.

The assembly is then placed in an electric furnace where the temperature is raised to a temperature sufficient to melt the annular solder. Accordingly, the annular solder is melted, whereby the electrode 306 and the flange portion 102 are soldered by the soldering portion 701. At the same time, the housing portion 207 and the electrode 303 are also soldered by the soldering portion 702. The soldering portion 701 is then opposite from the electrode 306 of the device 300 through the gap formed by the rib 105 between the cylindrical portion 101 and the center hole 302, that is, the side of the electrode 304. Stretches.

Therefore, the soldering portion 701 is used to connect the electrodes 304 and 306 and to electrically and mechanically connect them to the cylindrical portion and the flange portion of the through conductor 100 in common.

At this time, between the inner surface of the central hole 302 and the outer surface of the cylindrical portion 101, the electrode 306 and 304 are commonly soldered to short-circuit the electrodes 304 and 306 so that the melted solder flows. By means of the ribs 105 that facilitate this, a gap is created. On the other hand, a gap is also made between the surface of the electrode 306 and the flange portion 402 by the action of the plurality of protrusions 104 formed on the flange portion 102. Therefore, air between the cylindrical portion 101 and the center hole 302 easily leaks, thereby facilitating the flow of molten solder.

In this way, a plurality of ribs 105 are formed on the cylindrical portion 101 of the through-conductor and a plurality of protrusions 104 are formed on the flange portion 102 to penetrate the electrodes of the through-type RC device 300. It ensures that the conductor is soldered. Accordingly, the soldered portion 701 is formed uniformly and prevents the formation of non-uniform inductance in such a portion.

As shown in FIG. 3, the shield case fixing part 207 is formed with a plurality of protrusions 207a. Therefore, the fixing portion 207 is formed a lot of space between the electrode 303 and the unit 301. Therefore, many solder portions 207 are formed there. Therefore, most of the solder portion 702 lying between the shield case 200 and the fixing portion 207 and the electrode 303 and the dielectric unit 301 performs the following functions.

In particular, the shield case 200 is made of metal, for example, while the dielectric unit 301 is made of ceramic, for example. Therefore, the coefficients of thermal expansion of these materials differ greatly. Therefore, when the shield casing is heated or cooled rapidly as in the case of thermal shock tests, the expansion or contraction of one material is significantly greater than the expansion or contraction of another material. Therefore, without a large amount of solder in the soldering portion 702 described above, the stress due to the difference in thermal expansion coefficient described above can be transferred directly to the dielectric unit 301, thereby causing the dielectric unit 301 to crack.

However, according to the embodiment shown, a large amount of solder is in the soldered portion 702. As is well known, the solder is soft compared to the shield case and the dielectric unit. Thus, the stresses applied to the two materials described above are completely absorbed by the solder, thereby preventing the aforementioned cracking from occurring.

In this way, the shield case 200, the penetration type RC device 300, and the penetration conductor 100 are electrically connected and mechanically fixed.

Thereafter, the resin layer 401 is formed at the portion defined by the side surface 204 of the inner side of the shield case 200 and the raised portion 103 of the device 300 and the through conductor 100. At the same time, the resin layer 402 is formed at the portion defined by the raised portion 206 of the shield case 200, the cylindrical portion 101 of the through conductor 100, and the device 300.

For example, a cap 600 made of resin is fixed to the flange portion 102 and the raised portion 103 of the through conductor 100. Cap 600 is composed of a small diameter portion 603 having an outer diameter approximately equal to the inner diameter of the raised portion of the through conductor 100 and a large diameter portion 601 having a larger diameter than the raised portion 103, the large diameter The portion 601 and the small diameter portion 603 are shaped to be connected by the connecting portion 602.

The cap 600 is also formed of a flat portion 604 extending from the end of a small diameter portion 603 having a center hole and a cylindrical portion 605 extending from the inner circumference of the center hole of the flat portion. The small diameter portion 603 of the cap 600 is inserted into the raised portion 103 of the through conductor 100 so that the upper edge of the raised portion 103 is in contact with the connecting portion 602. The flat portion 604 of the cap 600 is placed in contact with the flange portion 102 (FIG. 6) of the through conductor 100. The cylindrical portion 605 of the cap 600 is inserted into the cylindrical portion 101 of the through conductor 100. The internal insulation 502 of the coaxial cable to be described later is inserted through the cylindrical portion 605 of the cap as well as the cylindrical portion of the through conductor 100. The cap 600 solders the capped RC composite device 15 to the center conductor 501 of the coaxial cable, and the composite device 15 with the cap is attached to an unnecessary portion such as the raised portion 103 of the through conductor 100. Used to prevent attachment.

The inner insulation 502 of the coaxial cable is inserted into the cylindrical portion 101 of the through conductor 100 and the end of the center conductor 501 sealed with the inner conductor 502 is sent to the shield case 200. And soldered to the capped RC composite as described above. The outer conductor 503 of the coaxial cable is placed in contact with the outer surface of the cylindrical portion 101 and fastened therein by the fastening member 504.

Coaxial cable connector receptacle 160 is secured to hole 206 (see also 3D) of side 204 of shield case 200.

Coaxial cable, not shown, whose center conductor is electrically connected to terminal 170, is connected to coaxial cable connector receptacle 160.

Terminal 170 is connected to one of the capped RC composite devices 15 described above. The other opening of the shield case 200 is covered by the shielding lid 210. The shielding lid 210 is prevented from slipping off by the rib 205 (see also 3d) formed on the side surface 204.

The antenna terminal plate thus obtained is the inside of the coaxial cable to the tuner circuit of the television receiver while a 75 Ω coaxial cable connected from the antenna is connected to the connector receptacle 105 and the center conductor 501 and the outer conductor 503 are connected to the corresponding portion. The insulation 502 is installed to be inserted into the through conductor 100.

8a and 8b and 8c are left side, shear and right side views of another example of the through-type RC device 300 used in the present invention. The electrode 307 is formed on almost the entire surface of the main surface of the donut-type dielectric unit 301 except for the periphery of the through hole 302 and another electrode 307 is formed along the side of the unit 301. It extends to the end of the opposite major surface. Another electrode 308 is formed on the other main surface, separate from the electrode 307, and therein. The electrode 308 coincides with the inner electrode shown in FIG. 1 and the electrode 307 coincides with the outer electrode shown in FIG.

The printed resistance member 305 ′ is formed between the electrodes 307 and 308. Since the resistive element is thus printed on the dielectric unit 301, there is no need for a separate resistor.

9 is a side view of a partial cross section of another example of the through conductor 100 used in the present invention. In the illustrated example, the plurality of protrusions 104 and the plurality of ribs 105 shown in FIG. 6 are omitted. Therefore, there may be a non-uniformity of the soldered portion 701 shown in FIG. 7 as compared to the case shown in FIG.

In particular, since the through conductor 100 shown in FIG. 6 is formed of the ribs 105, a large amount of solder is formed on the inner surface of the through hole 302 and the through conductor 100 of the donut-type dielectric unit 301. It is filled between the outer surface of the cylindrical portion 101. However, without such ribs 105, it is possible to prevent a large amount of solder from filling, such as the soldering portion 701.

10 is a cross-sectional view of another example of a shield case used in the present invention. In the shield case of the illustrated embodiment, the protrusion 207a shown in FIG. 3 is omitted. Therefore, there is a fear that the soldered portion 702 shown in FIG. 7 is not flat or thinner than the case shown in FIG.

Although the present invention has been described and illustrated in detail, it should be clearly understood that such is only by way of illustration and example, and the spirit and scope of the present invention are necessarily limited only by the appended claims of utility model registration. This should be clearly understood.

Claims (1)

A shield case 200 having first and second openings 201 and 203 at both ends, the shield case including a flat housing portion 207 around the first opening 201, and a shield case. And a plurality of protrusions 207a contacting the capacitor unit formed in the accommodating portion and the capacitor unit 300 having a hole 302 disposed in the accommodating portion, whereby a gap is formed between the capacitor unit and the accommodating portion. And a through-conductor 100 formed through the hole 302 formed in the donut-type capacitor unit and the first opening 201 of the shield case, and a second opening of the shield case made of a conductive material. A shield case with a capacitor including a shield lid (210) covering the 203.