JPH0314834Y2 - - Google Patents

Description

[Detailed Description of the Invention] Field of the Invention The present invention consists of capacitor elements inserted into a signal path and a ground path between an antenna output stage and a tuner input stage of a television receiver, respectively, housed in a metal case. Regarding antenna shield boxes.

2. Description of the Related Art As shown in FIG. 1, a conventional antenna shield box is a disk-shaped antenna shield box in which one end of a metal case 1 having a rectangular parallelepiped shape is drawn into a circular shape, and a through hole is formed in the drawn part 1a. One electrode 2a of the capacitor 2 is soldered, a metallic cylindrical through terminal 3 inserted into the through hole of the capacitor 2 is soldered to the other electrode 2b of the capacitor 2, and an insulating layer is placed around the capacitor 2. While filling the resin 4, the inner insulator 5b at the other end of the coaxial cable 5, one end of which is connected to a tuner of a television receiver (not shown), is inserted into the through terminal 3, and the braided wire of this coaxial cable 5 is inserted. The shaped outer conductor 5c is connected to the through terminal 3, while the composite component is connected between the core wire shaped inner conductor 5a covered by the inner insulator 5b and the inner terminal 6a of the antenna plug 6 attached to the metal case 1. 7 connected together is generally known.

The antenna shield box described above is shown in FIG. 2 from a circuit perspective. That is, the composite component 7 is composed of a capacitor C ₀ , a resistor R ₀ , and a discharge gap 8. The external terminal 6b of the antenna plug 6 is electrically connected to the metal case 1, and the external conductor 5c of the coaxial cable 5 is connected to the external terminal 6b of the antenna plug 6. and the metal case 1, there is a capacitance _C1 of the capacitor 2 and a capacitor 2 which is not shown in FIG.
A resistor R ₁ integrally formed with is connected.

By the way, in this conventional antenna shield box, due to its structure, the process of soldering one electrode 2a of the capacitor 2 to the metal case 1,
Internal conductor 5a of coaxial cable 5 and antenna connector 6
A process of connecting the composite component 7 to the internal terminal 6a of the device is required, and it has been difficult to automate this process with a machine. Therefore, these steps are performed one by one by hand, resulting in a problem of high cost per item.

Purpose of the invention This invention was made in order to solve the above problems, and the purpose was to provide an antenna shield box with a structure that requires fewer steps than the conventional one and can be easily manufactured automatically by a machine. be.

Summary of the invention To summarize this invention, a coaxial cable connected to a tuner is attached to one metal case member 13 of a metal case 20 formed by combining two metal case members 13 and 14 that are electrically insulated from each other. The outer conductor 5 of the coaxial cable 5 is arranged such that the inner conductor 5a is guided inward of the metal case 20.
c is electrically connected to the other metal case member 1
4, the external terminal 6b of the antenna plug is electrically connected so that the internal terminal 6a of the antenna plug is guided inward of the metal case 20, and a single insulator is provided inside the metal case 20. At least two capacitor elements each having electrodes on both sides are embedded in a plastic resin 12 so that each electrode is exposed on both sides, and one electrode of at least one capacitor element is connected to the tuner. The other electrode is electrically connected to the inner conductor 5a of the coaxial cable to the inner terminal 6a of the antenna plug 6 provided on the other metal case member 14, and one electrode of at least one capacitor element is electrically connected to the inner conductor 5a of the coaxial cable. The other electrode is electrically connected to the one metal case member 13 and the other metal case member 14, and at least one of the capacitor elements has a resistor on the side of the capacitor element. This is the antenna shield box, which is a CR composite part installed.

DESCRIPTION OF EMBODIMENTS An embodiment of this invention will be described below with reference to the drawings. Parts that are the same as those in the prior art are given the same numbers, and their explanations will be omitted.

Figures 3A and B are used for this example.
An example of CR composite part 9 is shown. Reference numeral 9a is a disc-shaped dielectric, and electrodes 10a and 10b are provided on both upper and lower main surfaces thereof, respectively. 11 is a resistor, and an electrode 10a is provided along the side surface of the dielectric 9a.
A resistive paste is formed between the electrode 10b and the electrode 10b using a roller method. In order to prevent the resistor 11 from being damaged at the edge 9b of the dielectric 9a, the edge 9b is chamfered in advance by barrel polishing or the like.

Figure 4 A and B show the 1 inserted into the signal path.
CR composite parts 19 are placed in the center, and two CR composite parts 29 inserted into the ground path are placed in the CR composite part 1.
9, electrodes 10a and 10b are exposed on both sides and embedded in a single insulating resin 12. This method of burying CR composite parts 19 and 29 with insulating resin 1
2 is fixed in a mold having the external shape of 2, and molten resin is poured into this mold and cooled and solidified to form the insulating resin 12. A method may be adopted in which holes are provided and the CR composite parts 19 and 29 are press-fitted and welded therein.

5A and 5B show an insulating resin 12 in which CR composite parts 19 and 29 are embedded in a metal case 20 consisting of two metal case members 13 and 14.
It shows the state before and after being accommodated.

A braided external conductor 5c at the other end of the coaxial cable 5, one end of which is connected to a tuner of a television receiver (not shown), is connected to the metal case member 13. The inner conductor 5b of the coaxial cable 5 is inserted through the hole.
Also, in the metal case member 13, one electrode 10a of the CR composite component 29 embedded in the insulating resin 12 is provided.
Two convex terminals 13a are provided for contacting with. This convex terminal 13a is connected to the metal case member 1.
It is thinner than the other parts of 3 and has elasticity, and a notch is provided in the thin part. On the other hand, the coaxial cable 5 covered with the internal insulator 5b
The core wire-shaped internal conductor 5a is inserted into the hole of the elastic insulating terminal 15 and then bent, so as to come into contact with one electrode 10a of the CR composite component 19 embedded in the insulating resin 12. There is.

The metal case member 14 is fitted into the insulating case 16 to maintain insulation from the metal case member 13, and has a convex portion for contacting the other electrode 10b of the CR composite component 29 embedded in the insulating resin 12. Two shaped terminals 14a are provided. This convex terminal 14a is thinner than other parts of the metal case member 14 and has elasticity, and a cut is provided in the thin part. In addition, metal case member 1
4 and an insulating case 16 into which it is fitted, an antenna plug 6 is attached, and a metal case member 14
and the external terminal 6b of the antenna plug 6 are electrically connected. A metal terminal 17 for contacting the other electrode 10b of the CR composite component 19 embedded in the insulating resin 12 is connected and fixed to the internal terminal 6a of the antenna plug 6. The metal terminal 17 and the internal terminal 6a of the antenna plug 6 may be formed integrally.

FIG. 5B shows metal case members 13 and 14.
2 shows a state in which the insulating resin 12 in which the CR composite parts 19 and 29 are embedded is housed. Insulating resin 1
2 is sandwiched between the metal case members 13 and 14, and the end 13b of the metal case member 13 is inserted into the insulating case 16.
When crimped to the bottom of the convex terminals 13a and 14
a. Due to the elasticity of the insulating terminal 15 and the metal terminal 17, the insulating resin 12 is pressed and held. As a result, the inner conductor 5a of the coaxial cable 5 is connected to one electrode 10a of the CR composite component 19, and the metal terminal 17 is connected to the other electrode 10a of the CR composite component 19.
It is electrically connected to the other electrode 10b of the CR composite component 19, and the convex terminal 13a is connected to the CR composite component 2.
One electrode 10a of 9 and the convex terminal 14a are CR
It is electrically connected to the other electrode 10b of the composite component 29.

In one embodiment of the present invention configured in this way, as shown in FIG. Capacity of C ₂
and resistance _R2 are inserted, and the capacitance _C3 ,
C ₄ and resistors R ₃ and R ₄ are inserted.

The above is one embodiment of the antenna shield box of the present invention, and it goes without saying that the design can be changed within the scope of the invention. For example, in this embodiment, all of the capacitor elements inserted into the signal path and the capacitor elements inserted into the ground path are CR composite components 19 and 29, but it is not necessary that all of them are CR composite components. . That is, as shown in FIG. 7A, one of the two CR composite components 29 inserted into the ground path is a non-CR composite capacitor element.
Can be replaced with _C5 . Furthermore, as shown in FIG. 7B, if coils L ₁ and L ₂ are inserted between the signal path and the ground path on the antenna connector 6 side, the CR composite component 19 inserted in the signal path
can be replaced with a non-CR composite capacitor element _C6 . This is achieved by the coils L ₁ and L ₂ and the coil L ₃ inserted between the signal path and the ground path inside the tuner 18.
Resistance R ₂ min of CR composite part 29 Resistance R ₃ and R ₄
This is because it can be used for both purposes. Conversely, the composite component 29 inserted into the ground path can be replaced with a non-CR composite capacitor element. If the modified examples shown in FIGS. 7A and 7B are combined, there will be one CR composite part as shown in FIG. 7C.

In addition, the CR composite parts used in this invention are
The shape is not limited to the shape shown by reference numeral 9 in FIGS. 3A and 3B.

Furthermore, the number of capacitor elements inserted in the signal path and the ground path, and the series,
It can be inserted in any parallel direction. 8th
Figure A shows a CR composite component 19 inserted into the signal path,
and CR composite part 29 inserted into the earth path
An example is shown in which two of each are buried in series in the insulating resin 12. Figure 8B shows CR in the ground path.
Gap 18 inserted in parallel with composite part 29
An example in which is added and buried in the insulating resin 12 is shown. In this case, metal case members 13 and 14,
Convex terminals 13a and 14a are added for contacting gap 18. It is also possible to insert a gap in the signal path. An antenna shield box using these insulating resins 12 also belongs to the present invention.

Effects of the invention As is clear from the above explanation, the antenna shield box of this invention embeds the capacitor element inserted into the signal path and the capacitor element inserted into the ground path in a single insulating resin. Since this is housed in a metal case, the number of steps is fewer than that of conventional antenna shield boxes, and automatic manufacturing using a machine is easy. Furthermore, since at least one of the capacitor elements inserted into the signal path and the ground path is a CR composite component, there is no need to insert a separate resistor.

Therefore, according to the antenna shield box of this invention, the cost per unit can be significantly reduced.

[Brief explanation of drawings]

Figure 1 is a side sectional view showing a conventional antenna shield box, Figure 2 is its equivalent circuit diagram, and Figure 3A.
is a plan view showing an example of CR composite parts used in an embodiment of the antenna shield box of this invention,
Fig. 3B is a side view of the same, Fig. 4A is a perspective view showing an example of an insulating resin used in an embodiment of this invention, Fig. 4B is a side sectional view of the same, and Fig. 5A is this FIG. 5B is a side sectional view thereof, FIG. 6 is an equivalent circuit diagram thereof, FIGS. 7A to C are equivalent circuit diagrams showing other embodiments, and FIG. 8A is a perspective view showing one embodiment of the invention. and B are side sectional views showing other examples of insulating resin. 5...Coaxial cable, 6...Antenna connector,
9,19,29...CR composite part, 12...Insulating resin, 13,14...Metal case member, 16...
...Insulating case, 20...Metal case.

Claims (1)

[Claims for Utility Model Registration] Metal case 20 formed by combining two metal case members 13 and 14 that are electrically insulated from each other
The outer conductor 5c of the coaxial cable 5 is electrically connected to one metal case member 13 so that the inner conductor 5a of the coaxial cable connected to the tuner is led out inside the metal case 20,
The external terminal 6b of the antenna plug is electrically connected to the other metal case member 14 so that the internal terminal 6a of the antenna plug is led out into the metal case 20, and , single insulating resin 1
at least two capacitor elements each having electrodes on both sides embedded in a coaxial cable such that each electrode is exposed on both sides, and one electrode of the at least one capacitor element is connected to the tuner. The other electrode is electrically connected to the internal terminal 6a of the antenna plug 6 provided on the other metal case member 14, and one electrode of at least one capacitor element is electrically connected to the internal conductor 5a of the other metal case member 14. the other electrode is electrically connected to the other metal case member 14, and at least one of the capacitor elements has a resistor provided on the side of the capacitor element. Antenna shield box is a CR composite part.