JPH0138908Y2 - - Google Patents

Description

[Detailed description of the invention] This invention prevents the tuner's DC voltage and commercial power supply voltage from leaking to the antenna side, and
The present invention relates to an antenna signal supply device that can also prevent local oscillation signals from leaking to the antenna side, which adversely affect a television public viewing system or the like.

Conventionally, there has been a device of this type as shown in FIG. In FIG. 1, one end of the outer shell conductor 1a constituting the coaxial terminal 1 is formed into a tip shape,
This outer shell conductor 1a includes a dielectric 4a, electrodes 4b, 4
The cylindrical body 3 is covered with a cylindrical body 3 whose end is closed by a capacitor 4 made of C and has a flange 3a that can be attached to a side wall of a television or the like. Thus, the outer shell conductor 1a, the cylindrical body 3, and the electrodes 4b, 4c constitute a shield case.

In this case, a hole is bored in the center of the capacitor 4, and the end of the coaxial cable 5 is passed through this hole, and its outer conductor 5a is soldered to the electrode 4c, while the electrode 4b is connected to the cylindrical body 3. is soldered to. Furthermore, an insulating bush 6 is fitted between the insulating sheath 5c and the outer conductor 5a of the coaxial cable, and an adhesive 7 is fitted on the electrode 4b side.
However, the adhesive 8 is thickly applied to the electrode 4c side, and the adhesive 7 is applied to the cylindrical body 3, the capacitor 4, and the coaxial cable 5, and the adhesive 8 is applied to the cylindrical body 3, the capacitor 4, and the bushing 6. Fixed.

On the other hand, an insulator 2 that holds an electronic component 9 at approximately the center thereof is embedded inside the outer shell conductor 1a constituting the coaxial terminal 1, and one end of this electronic component 9 is located at the center of the coaxial terminal 1. The other end is connected to the conductor 1b, and the other end is connected to the center conductor 5b of the coaxial cable 5.

As a result, the outer shell conductor 1a of the coaxial terminal 1 and the outer conductor 5a of the coaxial cable 5 are connected to the capacitor 4.
is connected in an alternating current manner via a coaxial cable 5.
Even if an extremely low frequency commercial power supply voltage is applied to the outer conductor 5a of the coaxial terminal 1, this voltage will not appear on the outer shell conductor 1a of the coaxial terminal 1.

Also, the electronic circuit component 9 may be a single capacitor or
Alternatively, it is a composite body consisting of a capacitor and a low-frequency blocking filter, and the capacitor blocks direct current voltage on the tuner side, and the low-frequency blocking filter prevents the local oscillation signal of the tuner from leaking to the antenna side.

In this case, since the electronic circuit component 9 is inside the shield case, it is not affected by external electromagnetic fields, and thus a low-noise antenna signal can be supplied to the tuner side.

By the way, since the electronic circuit component 9 is required to have a relatively high withstand voltage, its shape is inevitably large, while there is an extremely strong demand for miniaturization of the antenna signal supply device. .

Therefore, the external shape of the shield case is made as small as possible, but in the case of conventional devices, the insulator 2 is embedded so that the electronic circuit component 9 is located approximately in the center of the shield case. As a result, the lead wires 9a and 9b led out from the side ends of the electronic circuit components are attached at eccentric positions, and the distance from the shield case is not necessarily sufficient, and furthermore, the relative distance between the lead wires 9a and 9b is not determined. First, there was a risk that these would come close to each other and cause dielectric breakdown.

The present invention was developed to eliminate the above-mentioned drawbacks, and even when the shape of the shield case is made smaller, the antenna can maintain sufficient distance between the lead wires of electronic circuit components and the shield case, as well as the mutual distance between the lead wires. The purpose is to provide a signal supply device.

The present invention will be described below based on one embodiment with reference to the accompanying drawings.

FIG. 2 is a longitudinal cross-sectional view showing the structure of the antenna signal supply device according to the present invention, in particular when a capacitor 11 for DC voltage blocking is installed as an electronic circuit component. It is held by another holder 10 that engages with the holder 13, and the lead wires 11a and 11b are held at approximately the center of the shield case, that is, at an eccentric position.

FIGS. 3a and 3b are a sectional view and a back view showing the detailed structure of this holder 13. Compared to the insulator used in conventional devices, the space 13e for mounting electronic circuit components is made into an oval shape and expanded. Periphery 13
Cut out one side of d to make it easier to connect the lead wire,
Three grooves 13a, 13b, and 13c for joining with the holder 10 are provided on the remaining peripheral edge at positions separated by 90 degrees from each other.

Next, FIGS. 4a and 4b are a side view and a plan view showing the detailed configuration of the holder 10, in which an edge 10d is provided on the bottom plate 10g, which is a partially cut out square, to form a space 10e for storing the capacitor 11. Furthermore, a groove 13 of the holder 13 is provided on the outer periphery of the bottom plate 10g.
Protrusions 10a, 10b, and 10c are formed to be fitted into the holes a, 13b, and 13c, respectively. In this case, the protrusion 10a is the protrusion 10b, 10c.
If the protrusions 10a, 10b, 10c are fitted into the grooves 13a, 13b, 13c of the holder 13, respectively, the holder 10 will be longer than the axis of the holder 13, as shown by the broken line in FIG. It can be mounted in an eccentric position. On the other hand, the capacitor 11 has a protrusion 10a and a protrusion 10b as shown by broken lines in FIG.
The bases of the lead wires 11a and 11b are placed on an imaginary straight line connecting the
is located on the extension line of the protrusion 10b. In other words, when the capacitor 11 is mounted on the holder 10 and assembled into the holder 13, the base of the lead wire 10a is positioned approximately at the axial center of the holder 13. As a result, the center conductor 1b of the coaxial terminal 1 is bent with the lead wire 11a bent at an almost right angle from its root.
connected to. Further, a groove 10f is provided in the edge 10d of the holding body 10, and a lead wire 11b is passed through the groove 10f. As a result, the position of the capacitor 11 is determined accurately, and it can also be easily connected to the center conductor 5b of the coaxial cable 5 by bending the lead wire 11b in the opposite direction to the lead wire 11a.

Thus, one lead 1 of the capacitor 11
Since the lead wire 1a is arranged approximately on the axis of the shield case, and the other lead wire 11b is also arranged at a position relatively close to the axis, the distance from the shield case becomes large, and furthermore, the situation where the lead wires approach each other is avoided. It can be prevented.

Next, Fig. 5 is a vertical cross-sectional view showing the configuration of another embodiment of the antenna signal supply device according to the present invention, in particular, a capacitor for blocking DC voltage and preventing local oscillation signals from leaking to the antenna side. In the figure, the same reference numerals as in Figure 2 indicate the same elements,
In addition to these, 20 is another holder that engages with the holder 13, and 12 is a filter. While the holder 10 shown in FIG. 2 only holds the capacitor 11, the holder 20 shown in FIG. At the same time, these lead wires are formed so that they can be placed in the center of the shield case.

6a, b, and c are rear views, cross-sectional views, and plan views showing the detailed structure of this holder 20, and the bottom of the casing has an oval-shaped edge 20d inscribed in the edge 13d of the holder 13. Partially hollow out this edge 20
On the outer periphery of d, projections 20a, 20b, and 20c are fitted into the grooves of the holder 13, respectively.A support plate 20e is provided on the inner bottom of the casing, and a support plate 20f is provided on the outside of the casing. There is.

In this case, the protrusions 20a and 20c are at the edge 20d.
However, the protrusion 20b protrudes toward the outer circumference of the edge 20d, and also protrudes in a direction perpendicular to the bottom of the casing. Also, the protrusion 20
a and 20c are arranged on an imaginary straight line passing through the axis of the holding body 13, and support plates 20a and 20c
f is provided parallel to and near this virtual straight line.

Thus, the capacitor 11 is installed inside the casing surrounded by the edge 20d and the support plate 20e, and the lead wires 11a, 11 are connected to the groove 20h of the support plate 20e.
When the capacitor 11 is passed through the capacitor 11, its position will not change even if the lead wires 11a and 11b are bent to connect to other wires. Furthermore, the filter 12 is placed between the protrusion 20b protruding from the outer bottom of the housing and the support plate 20f.
Attach the lead wire 1 to the groove 20g of the support plate 20f.
2a, 12b, 12c, this filter 1
2 is also correctly positioned, and from now on lead wire 12
Even if a, 12b, and 12c are bent to connect to other parts, their positions do not change.

Thus, as shown in FIG. 5, the lead wire 11a of the capacitor 11 is connected to the center conductor 5b of the coaxial cable.
, the lead wire 11b of the capacitor 11 is connected to the lead wire 12a of the filter 12, the lead wire 12b of the filter 12 is connected to the outer shell conductor 1a of the coaxial terminal, and the lead wire 12c of the filter 12 is connected to the center conductor 1 of the coaxial terminal 1.
Even if they are respectively connected to the lead wires b, they can be separated by a sufficient distance from the shield case, and furthermore, the lead wires will not come close to each other.

As is clear from the above explanation, the antenna signal supply device of the present invention reliably holds the electronic circuit components installed in the shield case, maintains insulation between the lead wire and the shield case, and Lead wires of circuit components no longer come close to each other. Furthermore, simply by mounting electronic circuit components on a set of molded holders, their positions can be determined accurately, thereby significantly improving soldering and assembly operations.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view showing the configuration of a conventional antenna signal supply device, and FIG. 2 is a vertical sectional view showing the configuration of a first embodiment of the antenna signal supply device according to the present invention.
FIGS. 3a and 3b are cross-sectional views and rear views showing a holder that fits into the coaxial terminal of the same embodiment, and FIGS. 4a and 4b are side views showing another holder that engages with the holder, FIG. 5 is a vertical cross-sectional view showing the configuration of the second embodiment of the antenna signal supply device according to the present invention;
b and c are a rear view, a sectional view, and a plan view showing details of the constituent elements of the same embodiment. 1... Coaxial terminal, 1a... Outer shell conductor, 1b...
Center conductor, 10, 13, 20... Holder, 3...
Cylindrical body, 4, 11... Capacitor (electronic circuit component), 5... Coaxial cable, 5a... Outer conductor,
5b...center conductor, 12...filter (electronic circuit component).

Claims (1)

[Claims for Utility Model Registration] (1) A part of the shield case is formed by the outer shell conductor of a coaxial terminal and a capacitor having a through hole, and the end of the coaxial cable is attached to the through hole of the capacitor. By coupling the outer conductor of the coaxial cable to one electrode of the capacitor, the outer shell conductor of the coaxial terminal and the outer conductor of the coaxial cable are joined via the capacitor, and the coaxial terminal and the coaxial In an antenna signal supply device in which an electronic circuit component that blocks at least one of a DC component and a low frequency component is connected between a center conductor of a cable, a set of holders that retain the electronic circuit component within the shield case are provided. An antenna signal supply device characterized in that: (2) The antenna signal supply device according to claim 1, wherein the holding body is formed so that an appropriate distance can be maintained between the inner wall of the shield case and the lead wire of the electronic circuit component. (3) The antenna signal supply device according to claim 1, wherein the holding body has a groove formed therein so as to maintain an appropriate distance between the lead wires of the electronic circuit component.