KR20040098094A - Sash shield method of rf switch built-in type tuner - Google Patents

Abstract

PURPOSE: A chassis shielding method is provided to prevent interferences by shielding the gap formed between components through the use of a shield plate. CONSTITUTION: An RF switch built-in type tuner comprises a broadcast wave signal input terminal(11); a cable signal input terminal(12); an RF switch(13) for selectively outputting a broadcast wave signal and a cable signal; an amplifying terminal(14) for amplifying the signal input through the RF switch; a PCB(10) mounted with a plurality of electronic components including a modulation terminal(15) for modulating the signal output through the amplifying terminal; a chassis(100) where the PCB is coupled; and a top cover coupled to the top of the chassis. The chassis has a plurality of shield plates(110,120,130,140) arranged between electronic components on the PCB. Each of the shield plates is commonly grounded to the ground on the PCB and shielded.

Description

SASH SHIELD METHOD OF RF SWITCH BUILT-IN TYPE TUNER}

The present invention relates to an RF switch built-in tuner, and in detail, to install the shield plate in the chassis between the components that mutual interference occurs when combining the PCB of the tuner mounted on each component to block the occurrence of mutual interference. It relates to a chassis shield method of an RF switch built-in tuner.

In general, a tuner is a device that receives an RF signal (radio frequency signal) through an antenna, converts it into an IF signal (intermediate frequency signal), detects it, and separates it into a video signal and an audio signal to output it.

As digital broadcasting is being implemented, multi-channel services are provided. In order to satisfy such multi-channel services, digital tuners (HD and SD) are designed to receive both over-the-air signals and cable signals. The digital tuner has a built-in RF switch for selecting over-the-air signals and cable signals, and when a signal is induced through over-the-air or cable input terminals, a digital tuner selectively inputs a signal through a high-frequency relay inside the RF switch. This selected signal is input to the modulation stage through the amplifier stage and modulated.

However, these digital tuners allow unselected signals to flow through the chassis to other electronic components, even when the airwaves and cable signals are introduced through the RF switch, when the signal above the standard electric field is introduced. This interferes with the selected signal, which in turn degrades the performance of the tuner.

Accordingly, an object of the present invention is to solve the above problems, and to prevent mutual interference from occurring by shielding between components capable of mutual interference through a shield plate.

1 is a plan view showing the chassis configuration of the tuner built-in RF switch to which the present invention is applied

Figure 2 is a front view showing the configuration of the chassis shield plate of the RF switch built-in tuner to which the present invention is applied

<Description of the symbols for the main parts of the drawings>

10: PCB 11: air signal input terminal

12 cable input terminal 13 RF switch

14: amplification stage 15: modulation stage

100: chassis 110: first shield plate

111: step 113: coupling hole

120: second shield plate 130: third shield plate

140: fourth shield plate

Features of the present invention for achieving the above object,

An airwave signal input terminal for receiving an airwave signal, a cable signal input terminal for inputting a cable signal, an RF switch for selectively outputting an airwave signal and a cable signal, an amplifier stage for amplifying a signal input through the RF switch, and the amplifying stage In the RF switch-embedded tuner including a PCB mounted with a plurality of electronic components, such as a modulation stage for modulating the signal output through the, a chassis to which the PCB is coupled, a top cover coupled to the upper end of the chassis,

The chassis may be provided with a plurality of shield plates between each electronic component on the PCB capable of mutual interference, and the shield plates may be shielded by common grounding to the ground on the PCB.

Here, among the plurality of shield plates, the shield plate located between the RF signal input terminal and the cable signal input terminal on the PCB, and the RF switch,

When the top cover and the chassis are coupled to each other, the cable signal input terminal and the RF switch correspond to each other so that the step is in close contact with the top cover so that the space is completely shielded, and the step is formed higher.

Hereinafter, the configuration of the chassis of the RF switch built-in tuner according to an embodiment of the present invention will be described in detail with reference to FIGS.

1 is a plan view illustrating a chassis configuration of an RF switch built-in tuner to which the present invention is applied, and FIG. 2 is a front view illustrating a chassis shield plate of an RF switch built-in tuner to which the present invention is applied.

1 and 2, the chassis 100 of the RF switch built-in tuner according to the present invention includes a first shield plate 110, a second shield plate 120, a third shield plate 130, and a first shield plate. It consists of a four shield plate 140.

Prior to the description, as shown in FIG. 1, reference numeral 10 denotes a PCB on which each electronic component is designed and mounted, 11 denotes an airwave signal input terminal through which an airwave signal is input, and 12 denotes a cable signal input terminal through which a cable signal is input. 13 is an RF switch for selectively outputting over-the-air signals and cable signals, 14 is an amplifying stage for amplifying a signal input through the RF switch, and 15 is a modulating stage for modulating a signal output through the amplifying stage.

First, the first shield plate 110 is installed between the airwave signal input terminal 11 and the cable signal input terminal 12 and the RF switch 13 on the PCB 10. The first shield plate 110 is shielded by being grounded with the ground (not shown) of the PCB 10. Here, the first shield plate 110 is connected to the top cover (not shown) and the chassis 100 when the cable signal input terminal 12 and the RF switch 13 mutually close to the top cover to completely shield the space. The corresponding position is 0.5 to 1mm stepped 111 and formed higher, the coupling groove 113 is coupled to the chassis 100 is provided.

The second shield plate 120 is installed in the chassis 100 between the air signal input terminal 11 and the cable signal input terminal 12 on the PCB 10, and the chassis 100 and the first shield plate 110 are connected to each other. A coupling groove (not shown) capable of coupling is provided, one end of which is coupled to the chassis 100, and the other end of which is coupled to the first shield plate 110.

In addition, the third shield plate 130 is installed in the chassis 100 between the cable signal input terminal 12 and the RF switch 13 and the modulation stage 15 on the PCB 10, the chassis 100 and the first A coupling groove (not shown) capable of engaging with the shield plate 110 is provided, and a central portion thereof is coupled with the first shield plate 110.

In addition, the fourth shield plate 140 is installed between the amplifier stage 14 and the RF switch 13, the coupling groove (not shown) that can be coupled to the chassis 100 and the first shield plate 110 is provided, One end is coupled to the chassis 100 and the other end is coupled to the first shield plate 110.

Hereinafter, an operation of an RF switch built-in tuner according to the present invention will be described with reference to FIGS. 1 and 2.

First, the second shield plate 120, the third shield plate 130, and the fourth shield plate 140 are structurally coupled to the first shield plate 110 through coupling grooves, respectively, and the first shield plate ( Since 110 is grounded with the ground of the PCB 10, each plate becomes a common ground with the ground of the PCB 10 in a circuit.

In this state, since the first shield plate 110 is installed between the airwave signal input terminal 11 and the cable signal input terminal 12 and the RF switch 13 on the PCB 10, the airwave signal input terminal 11 or the cable signal. The signal of the input terminal 12 is passed through the chassis 100 to the RF switch 13 or the amplifier stage 14, or the signal of the RF switch 13 or the amplifier stage 14 is passed through the chassis 100 through the airwave signal input terminal 11. Or the cable signal input terminal 12 is blocked from entering each other and all the incoming signals are passed to the ground. Meanwhile, since the PCB 10 and the ground ground are made through the first shield plate 110, the RF switch 13 and the cable signal input terminal 12 are grounded to the same ground. Because of this, since the generation of the mutual interference signal may be greater, the top cover is completely in close contact with the protruding step 111 formed when coupled to the chassis 100 to completely block the space therebetween to completely exclude the mutual interference.

Since the second shield plate 120 is installed between the airwave signal input terminal 11 and the cable signal input terminal 12 on the PCB 10, the signal of the airwave signal input terminal 11 is connected to the cable signal input terminal through the chassis 100. 12 or the signals of the cable signal input terminal 12 are prevented from entering each other through the chassis 100 to the airwave signal input terminal 11 and all the incoming signals are passed to the ground.

In addition, since the third shield plate 130 is installed in the cable signal input terminal 12 and the RF switch 13 on the PCB 10 and the chassis 100 between the modulation stage 15, the cable signal input terminal 12 or Signal from RF switch 13 through chassis 100 to RF switch 13 or cable signal input 12, or signal from cable signal input 12 or RF switch 13 through chassis 100. Blocks the signal from the modulation stage 15 or the modulation stage 15 from entering each other through the chassis 100 to the RF switch 13 or the cable signal input terminal 12 and passes all the incoming signals to ground. .

In addition, since the fourth shield plate 140 is installed between the amplifier stage 14 and the RF switch 13, the signal of the amplifier stage 14 is transmitted to the RF switch 13 through the chassis, or the signal of the RF switch 13 The amplification stage 14 blocks the flow of each other and passes all the incoming signals to the ground.

Therefore, by shielding between electronic components that can cause mutual interference on the PCB by using a shield plate, it is possible to completely block the movement of signals that may cause mutual interference.

As described above, according to the chassis shield method of the tuner built-in RF switch according to the present invention, it is possible to prevent mutual interference from occurring by shielding between components capable of mutual interference through the shield plate.

Claims (2)

An airwave signal input terminal for receiving an airwave signal, a cable signal input terminal for inputting a cable signal, an RF switch for selectively outputting an airwave signal and a cable signal, an amplifier stage for amplifying a signal input through the RF switch, and the amplifying stage In the RF switch-embedded tuner including a PCB mounted with a plurality of electronic components, such as a modulation stage for modulating the signal output through the, a chassis to which the PCB is coupled, a top cover coupled to the upper end of the chassis, In the chassis, a plurality of shield plates are provided between the electronic components on the PCB that may generate mutual interference, and the shield plates are shielded by common ground to the ground on the PCB. Chassis Shield Method. The method of claim 1, Among the plurality of shield plates, a shield plate positioned between an air wave signal input terminal and a cable signal input terminal on the PCB and an RF switch, When the top cover and the chassis are coupled to each other, the step of the cable signal input terminal and the RF switch corresponding to each other is formed to have a step of 0.5 to 1 mm so that the step is in close contact with the top cover so as to completely shield the space. Chassis shield method of tuner built-in RF switch.