JPH0317483Y2 - - Google Patents

Description

[Detailed description of the invention] Field of the invention This invention is an antenna shield in which electronic components inserted into the signal path and ground path between the antenna output stage and the tuner input stage of a television receiver are housed in a metal case. Regarding BOTS.

BACKGROUND ART As a conventional antenna shield box, the one shown in FIG. 1 is generally known.

Reference numeral 1 denotes a rectangular metal case, and the opening at one end is drawn into a circular shape. 2 is a disk-shaped capacitor having a through hole, and one electrode 2a is soldered to a drawn portion of the metal case 1. Further, a cylindrical metal terminal 3 inserted into a through hole of the capacitor 2 is soldered to the other electrode 2b. 4 is an insulating resin, and capacitor 2
is filled around the .

An inner insulator 5b of a coaxial cable 5, one end of which is connected to a tuner of a television receiver (not shown), is inserted into the cylindrical metal terminal 3, and a braided outer conductor 5c of the coaxial cable 5 is inserted into the cylindrical metal terminal 3. It is connected. Further, a core-shaped internal conductor 5 covered with an internal insulator 5b of the coaxial cable 5
a and the internal terminal 6a of the antenna plug 6 attached to the metal case 1, there is a composite electronic component 7.
is connected.

The antenna shield box described above is shown in FIG. 2 from a circuit perspective. That is, the composite electronic component 7 is composed of a capacitor C ₀ , a resistor R ₀ , and a discharge gap 8, and between the outer conductor 5c of the coaxial cable 5 and the metal case 1, the capacitor C ₁ of the capacitor 2, and Although not shown in FIG. 1, a resistor _R1 integrally formed with the capacitor 2 is connected. Note that the external terminal 6b of the antenna plug 6 and the metal case 1 are electrically connected.

By the way, this conventional antenna shield box has one electrode 2 of the capacitor 2 due to its structure.
a to the metal case 1, a process of soldering the cylindrical metal terminal 3 to the other electrode 2b of the capacitor 2, and an internal conductor 5 of the coaxial cable 5.
Since the process of connecting the composite electronic component 7 between the internal terminal 6a of the antenna plug 6 and the internal terminal 6a of the antenna plug 6 is complicated, it is difficult to automatically assemble it by a machine, and even if it is assembled by hand, it requires advanced manufacturing technology. . Therefore, there was a problem in that the manufacturing cost increased.

Purpose of the invention The present invention was devised to solve the above-mentioned problems.The purpose of this invention is to reduce the number of manufacturing steps than the conventional one, to make it easier to assemble, and to provide a signal path and a ground path on the antenna output stage side. By inserting a coil or resistor between
To provide an antenna shield box in which the discharge function of a resistor inserted into either the signal path or the ground path can be used for both the signal path and the ground path.

Summary of the invention To summarize this invention, a coaxial cable connected to a tuner is attached to one metal case member 14 of a metal case 20 formed by combining two metal case members 14 and 15 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
5, the external terminal 6b of the antenna plug is electrically connected such 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 capacitors each having electrodes on both sides are buried in a flexible resin 11 so that each electrode is exposed on both sides, and one electrode of the at least one capacitor is connected to the tuner. an antenna connector 6 whose other electrode is provided on the other metal case member 15;
, and one electrode of at least one capacitor is electrically connected to the one metal case member 14 and the other electrode is electrically connected to the other metal case member 15. A shield box, in which a resistor is connected in parallel to either one of the capacitors, and a coil or resistor is connected between the internal conductor of the antenna connector and the other metal case member on the side closer to the antenna connector than the capacitor and the resistor. This antenna shield box is characterized in that it is electrically connected to the antenna shield box.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The same parts as the conventional technology are given the same numbers,
The explanation will be omitted.

3A and 3B show a state in which a capacitor 9 inserted into a signal path and a capacitor 10 inserted into a ground path are embedded in a single insulating resin 11. Electrodes 9a and 9b are provided on both upper and lower main surfaces of capacitor 9, and electrodes 10a and 10b are provided on both upper and lower main surfaces of capacitor 10, respectively.

The method of embedding the capacitors 9 and 10 in the insulating resin 11 is to fix the capacitors 9 and 10 in a mold having the external shape of the insulating resin 11, pour molten resin into the mold, and then bury the capacitors 9 and 10 in the insulating resin 11. An injection method in which the insulating resin 11 is formed by cooling and solidifying it, or a method in which holes are provided in the already solidified insulating resin 11 and the capacitors 9 and 10 are press-fitted and welded therein can be employed.

In this embodiment, one capacitor 9 to be inserted into the signal path is buried in the center of the insulating resin 11, and two capacitors 10 to be inserted in parallel to the ground path are buried on both sides of the capacitor 9. ing.

FIG. 4A shows an insulating resin 11 in which capacitors 9 and 10 are embedded in a coil 12 inserted between the signal path and the ground path on the antenna output stage side of the capacitors 9 and 10, and grounded in parallel with the capacitor 10. The resistor 13 inserted into the path is shown before and after being housed in a metal case 20 made up of two metal case members 14 and 15.

A cylindrical portion 14a having an opening on the top surface is provided on the top surface of the metal case member 14. 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 cylindrical portion 14a, and an internal insulating conductor 5c of the coaxial cable 5 is connected to the opening. The body 5b is inserted. Further, the metal case member 14 is provided with two convex terminals 14b for contacting one electrode 10a of the capacitor 10 embedded in the insulating resin 11. The convex terminal 14b is provided by drawing, is thinner than other parts of the metal case member 14, has elasticity, and has a linear cut in the thin part.
On the other hand, the core-shaped internal conductor 5a of the coaxial cable 5 covered with the internal insulator 5b is inserted into the hole of the elastic insulating terminal 16 and then bent, and the capacitor embedded in the insulating resin 11 is 9
It is adapted to come into contact with one electrode 9a of the.

The metal case member 15 is fitted into an insulating case 17 to maintain insulation from the metal case member 14, and has a convex terminal for contacting the other electrode 10b of the capacitor 10 embedded in the insulating resin 11. Two 15a are provided. This convex terminal 15a is provided in the same manner as the convex terminal 14b. Further, the antenna plug 6 is attached to the metal case member 15 and the insulating case 17 into which it is fitted, and the metal case member 15 and the external terminal 6b of the antenna plug 6 are electrically connected. A metal terminal 18 for contacting the other electrode 9b of the capacitor 9 embedded in the insulating resin 11 is fixed to the internal terminal 6a of the antenna plug 6. The metal terminal 18 is housed in a recess provided in the metal case member 15. This metal terminal 18 and the internal terminal 6a of the antenna plug 6 may be formed integrally.

A coil 12 is inserted between the signal path and the ground path on the antenna output stage side of the capacitors 9 and 10, and one end is connected to the metal terminal 18, the other end is connected to the metal case member 15, and the metal case A metal terminal 18 is inserted into the recess provided in the member 15.
It is housed with.

A resistor 13 is inserted in the ground path in parallel with the capacitor 10 (see FIG. 4B), and is housed between the metal case member 15 and the insulating case 17. One terminal 13a of the resistor 13 is connected to the metal case member 15, and the other terminal 13b is led out from the insulating case 17 through a hole provided in the insulating case 17, and the insulating resin 11 is connected to the metal case member 15 as described later. After being accommodated between 14 and 15, it is connected to the metal case member 14 by soldering or the like.

As shown in FIG. 4B, the insulating resin 11 in which the capacitors 9 and 10 are embedded is sandwiched between the metal case members 14 and 15, and the end 1 of the metal case member 14 is
When 4c is caulked to the end of the insulating case 17, the insulating resin 11 is pressed and held by the elasticity of the convex terminals 14b and 15a, the insulating terminal 16, and the metal terminal 18. As a result, the internal conductor 5a of the coaxial cable 5 is electrically connected to one electrode 9a of the capacitor 9, the metal terminal 18 is electrically connected to the other electrode 9b of the capacitor 9, and the convex terminal 14b is electrically connected to one electrode 9b of the capacitor 10. The electrode 10a and the convex terminal 15a are electrically connected to the other electrode 10b of the capacitor 10.

As shown in FIG. 5, one embodiment of the present invention configured as described above has a capacitance C of a capacitor 9 between the signal path, that is, the internal terminal 6a of the antenna plug 6 and the internal conductor 5a of the coaxial cable 5. ₂ is connected to the ground path, that is, the external terminal 6b of the antenna connector 6.
and the outer conductor 5c of the coaxial cable 5, the capacitances C ₃ and C ₄ of the two capacitors 10 and the resistance of the resistor 13 are connected.
R ₂ is connected in parallel, and furthermore, a component L ₁ of the coil 12 is connected between the signal path and the ground path on the antenna output stage side from the capacitors 9 and 10 and the resistor 13.
enters. This antenna shield box is installed inside with a coil between the signal path and the ground path.
9 (component L ₂ ) inserted, the discharging function of the resistor 13 can be used as both the signal path and the ground path by the action of the coils 12 and 19.

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, the resistor 13 is inserted in the ground path in parallel with the capacitor 10, but instead of being inserted in the ground path, a resistor may be inserted in the signal path in parallel with the capacitor 9. Further, even if a resistor is inserted between the signal path and the ground path instead of the coil 12, the discharge function of the resistor 13 can be used for both the signal path and the ground path, and this case is also included in the present invention. . Also, one capacitor 9 is inserted in the signal path and two capacitors 10 are inserted in parallel in the ground path, but the number of capacitors inserted in the signal path and the ground path is arbitrary. It is not limited to. Further, if necessary, a discharge gap can be inserted into the signal path or the ground path.

Furthermore, if a CR composite component is used in place of the capacitor 10, the resistor 13 can be omitted. Further, the coil 12 inserted between the signal path and the ground path can also be embedded in the insulating resin 11. FIG. 6A shows an insulating resin 23 in which a CR composite component 21 is embedded in place of the capacitor 10, and an air-core coil 22 is also embedded therein.
Electrodes 21a,
21b are provided respectively. One end of the air-core coil 22 is connected to the electrode 9b of the capacitor 9, and the other end is connected to the electrode 2 of one CR composite component 21.
1b. FIG. 6B shows an insulating resin 25 in which a planar coil 24 is embedded instead of the air-core coil 22 in FIG. 6A. As shown in FIG. 7, this planar coil 24 has a conductive film 24b provided on a flexible insulating substrate 24a by printing or the like, and one end is connected to the electrode 9 of the capacitor 9.
b, and the other end is connected to electrode 2 of CR composite component 21.
1b. These insulating resins 23
Alternatively, if 25 is used, the coil 12 and resistor 13 as individual components can be omitted.

Effects of the Invention As is clear from the above explanation, according to the present invention, it is possible to obtain an antenna shield box that requires fewer manufacturing steps than the conventional one and is easier to assemble.

In addition, a resistor is inserted in parallel with the capacitor inserted in the signal path or the capacitor inserted in the ground path, and further between the signal path and the ground path on the antenna output stage side from the capacitor inserted in the signal path and the ground path. Since a coil or resistor is inserted in the capacitor, the discharge function of the resistor inserted in parallel with the capacitor can be shared between the signal path and the ground path.

[Brief explanation of the drawing]

Figure 1 is a side sectional view showing a conventional antenna shield box, Figure 2 is its equivalent circuit diagram, and Figure 3A.
3 is a perspective view showing an example of an insulating resin used in an embodiment of the antenna shield hook of the present invention.
Figure B is a side sectional view, Figure 4A is a perspective view showing an embodiment of the present invention, Figure 4B is a side sectional view, and Figure 5 is a side sectional view.
The figure is its equivalent circuit diagram, Figures 6A and B are side cross-sectional views showing other examples of insulating resin used in the present invention, and Figure 7 is used for the insulating resin shown in Figure 6B. FIG. 3 is a plan view showing a planar coil. 5...Coaxial cable, 6...Antenna connector,
9, 10... Capacitor, 11, 23, 25...
Insulating resin, 14, 15...Metal case member, 1
7...Insulation case.

Claims (1)

[Claims for Utility Model Registration] Metal case 20 formed by combining two metal case members 14 and 15 that are electrically insulated from each other
The outer conductor 5c of the coaxial cable 5 is electrically connected to one metal case member 14 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 15 so that the internal terminal 6a of the antenna plug is guided inside the metal case 20, and , single insulating resin 1
at least two capacitors each having electrodes on both sides embedded in a coaxial cable such that each electrode is exposed on both sides; one electrode of the at least one capacitor is connected to the tuner; An internal terminal 6 of an antenna plug 6, the other electrode of which is provided on the conductor 5a, is provided on the other metal case member 15.
an antenna shield box, in which one electrode of at least one capacitor is electrically connected to the one metal case member 14 and the other electrode is electrically connected to the other metal case member 15; A resistor is connected in parallel to either one of the capacitors, and a coil or a resistor is electrically connected between the internal conductor of the antenna connector and the other metal case member on the side closer to the antenna connector than the capacitor and the resistor. Antenna shield box characterized by being connected to.