JP2006054829A - Tv receiver, recording and reproducing device and tuner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a TV broadcast tuner in which a countermeasure against a jamming wave is taken by a simple structure and cost for manufacturing and assembling structural components can be reduced, and to provide a TV receiver and a recording and reproducing device comprising the tuner. <P>SOLUTION: The TV receiver comprises a first tuner package 1, a second tuner package 2, and a distribution coaxial cable 3 for connecting the first tuner package 1 and the second tuner package 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a receiving tuner built in a recording / reproducing apparatus such as a TV receiver or VTR.

2. Description of the Related Art In recent years, with the increase in the number of functions of video equipment such as TV receivers and VTRs, a number of tuners having a plurality of tuner packages are increasing. The tuner package is connected to an antenna line that is a coaxial cable, and the antenna line is connected to an external antenna.

FIG. 4 shows a schematic perspective view of a conventional tuner. The tuner B shown in FIG. 4 includes a first tuner package 91, a second tuner package 92, a distribution coaxial cable 93, and a ground metal plate 94.

The upper surface 910 of the first tuner package 91 is provided with an internal antenna terminal 911 for connecting to the second tuner package 92. In addition, the front surface 912 of the first tuner package 91 is provided with an external antenna terminal 913 for connection to an antenna line connected to an external antenna (not shown).

The upper surface 920 of the second tuner package 92 has an internal antenna terminal 921 for connecting to the first tuner package 91. The internal antenna terminal 911 of the first tuner package 91 and the internal antenna terminal 921 of the second tuner package 92 are connected by a distribution coaxial cable 93.

The signal input from the external antenna terminal 913 of the first tuner package 91 is also sent to the second tuner package 92 via the distribution coaxial cable 93. And first
The received signal is demodulated by the tuner package 91 and the second tuner package 92. By providing two tuner packages, the first tuner package 91 and the second tuner package 92, different channels can be received and demodulated. ) Can be recorded. In addition, having two tuner packages has many advantages over a single tuner package.

The signal sent from the antenna line to the external antenna terminal 913 has a very high frequency of several tens to several hundreds of MHz, and is susceptible to interference from the surroundings. Therefore, a coaxial cable having a shield braid arranged on the outer periphery is adopted as the antenna line. The shield braid is grounded to protect external interference from affecting internal signals.

However, there is a case where an interference wave flows through the shield knitting wire and the interference wave is input to the first tuner package 91 from the external antenna terminal 913, and the disturbance of video and / or audio is caused by the input of the interference wave. appear. In order to reduce the disturbance of the video and / or audio due to the interference wave, it is necessary to reduce the impedance of the tuner B to escape the interference wave.
The first tuner package 91 and the second tuner package 92 are connected to the internal antenna terminal 9.
11 and 921 are connected by a distribution coaxial cable 93, but the external antenna terminal 91 is connected.
The effect of reducing impedance with respect to the interference wave input from 3 is small.

In order to reduce the influence of the interference wave, in other words, in order to reduce the impedance of the tuner B, a portion connected to the shield braid of the external antenna terminal 913 and a grounding portion (case) of the first tuner package 91 And the grounding part (case) of the second tuner package 92 may be connected. At this time, the connection portion should be in the vicinity of the external antenna terminal 913. A grounding metal plate 94 that is in contact with the external antenna terminal 913 is installed, and the tuner B
The impedance is reduced. The ground metal plate 94 includes an external antenna terminal 913, a front surface 912 of the first tuner package 91, and a front surface 922 of the second tuner package 92.
And are electrically connected.
Japanese Utility Model Publication No. 9-163270

However, in the conventional tuner B, when the grounding metal plate 94 for connecting the ground portion of the external antenna terminal 913 and the second tuner package 92 is used, the grounding metal plate 94 must be separately manufactured. The first tuner package 91 and the second tuner package
In accordance with the arrangement of the tuner package 92, the external antenna terminal 913 of the first tuner package 91 and the case of the second tuner package 92 must be arranged so as to be in electrical contact. Thus, the metal plate for grounding 94 is expensive to manufacture and install.

Therefore, the present invention provides a TV broadcast tuner, a TV receiver including the tuner, and a recording / reproducing apparatus capable of reducing the manufacturing and assembly costs of components, in which measures against interference waves are taken with a simple structure. The purpose is to provide.

In order to achieve the above object, the invention of claim 1 includes a first tuner package, a second tuner package, and a distribution coaxial cable, wherein the first tuner package and the second tuner package are provided. The tuner package incorporates an IF circuit for demodulating the received signal, the first tuner package has a case grounded, an external antenna terminal connected to an antenna provided outside, and the distribution coaxial cable. The second tuner package has a case grounded, and has a second internal antenna terminal that engages the distribution coaxial cable; The first internal antenna terminal of the first tuner package is provided in the vicinity of the external antenna terminal, and the first internal antenna terminal and the second internal antenna terminal A TV receiver having a tuner, wherein an antenna terminal is connected by the distribution coaxial cable, and the internal antenna terminal is arranged so that the length of the distribution coaxial cable is minimized. I will provide a.

According to this configuration, the number of parts is reduced as compared with the conventional tuner, the number of parts to be manufactured is small, and the cost and time required for manufacturing and assembling can be reduced. Accordingly, the manufacturing cost of the TV receiver can be reduced.

Further, since the structure is simple, it is possible to reduce the occurrence of malfunction due to poor contact or the like.

In order to achieve the above object, the invention of claim 2 comprises a first tuner package, a second tuner package, and a distribution coaxial cable, wherein the first tuner package and the second tuner package are provided. The tuner package incorporates an IF circuit for demodulating the received signal, the first tuner package has a case grounded, an external antenna terminal connected to an antenna provided outside, and the distribution coaxial cable. The second tuner package has a case grounded, and has a second internal antenna terminal that engages the distribution coaxial cable; The first internal antenna terminal of the first tuner package is provided in the vicinity of the external antenna terminal, and the first internal antenna terminal and the second internal antenna terminal A recording / reproducing apparatus provided with a tuner, wherein an antenna terminal is connected by the distribution coaxial cable, and the internal antenna terminal is arranged so that the length of the distribution coaxial cable is the shortest I will provide a.

According to this configuration, the number of parts is reduced as compared with the conventional tuner, the number of parts to be manufactured is small, and the cost and time required for manufacturing and assembling can be reduced. Accordingly, the manufacturing cost of the recording / reproducing apparatus can be reduced.

As a recording / reproducing apparatus, a device capable of recording / reproducing received signals, such as a video recorder, a DVD recorder, and a hard disk recorder, can be widely used.

In order to achieve the above object, a third aspect of the invention includes a first tuner package, a second tuner package, and a distribution coaxial cable, wherein the first tuner package and the second tuner package are provided. The tuner package incorporates an IF circuit for demodulating the received signal, the first tuner package has a case grounded, an external antenna terminal connected to an antenna provided outside, and the distribution coaxial cable. The second tuner package has a case grounded, and has a second internal antenna terminal that engages the distribution coaxial cable; The first internal antenna terminal of the first tuner package is provided in the vicinity of the external antenna terminal, and the first internal antenna terminal and the second internal antenna terminal And an antenna terminal are connected with the distribution coaxial cable, which provides a tuner, characterized in that the internal antenna terminal length of the dispensing coaxial cables are arranged such that the shortest.

According to this configuration, the number of parts is reduced as compared with the conventional tuner, and the number of parts to be manufactured can be reduced. Thus, the cost and time required for manufacture and assembly can be reduced.

In order to achieve the above object, the invention of claim 4 includes a plurality of tuner packages and a distribution coaxial cable, and the plurality of tuner packages incorporate an IF circuit for demodulating a received signal, Cases of the plurality of tuner packages are grounded, and each of the plurality of tuner packages has an internal antenna terminal for engaging the distribution coaxial cable, and one of the plurality of tuner packages has an external terminal. An external antenna terminal connected to the antenna provided in the antenna package, and an internal antenna terminal provided in the tuner package including the external antenna terminal is provided in the vicinity of the external antenna terminal, and is provided in each of the plurality of tuner packages. Connected to the internal antenna terminal by the coaxial cable for distribution, the internal antenna terminal The length of the distribution coaxial cable to provide a tuner, characterized by being arranged such that the shortest.

According to this configuration, the number of parts is reduced as compared with the conventional tuner, and the number of parts to be manufactured can be reduced. Thus, the cost and time required for manufacture and assembly can be reduced.

In order to achieve the above object, the invention of claim 5 has a plurality of tuner packages and a distribution coaxial cable, and the plurality of tuner packages have a built-in IF circuit for demodulating a received signal, Cases of the plurality of tuner packages are grounded, and each of the plurality of tuner packages has an internal antenna terminal for engaging the distribution coaxial cable, and one of the plurality of tuner packages has an external terminal. An external antenna terminal connected to the antenna provided in the antenna package, and an internal antenna terminal provided in the tuner package including the external antenna terminal is provided in the vicinity of the external antenna terminal, and is provided in each of the plurality of tuner packages. Connected to the internal antenna terminal by the coaxial cable for distribution, the internal antenna terminal The length of the distribution coaxial cable to provide a TV receiver which is characterized by being arranged such that the shortest.

According to this configuration, the number of parts is reduced as compared with the conventional tuner, and the number of parts to be manufactured can be reduced. Thus, the cost and time required for manufacture and assembly can be reduced.

In order to achieve the above object, the invention of claim 6 has a plurality of tuner packages and a distribution coaxial cable, and the plurality of tuner packages have a built-in IF circuit for demodulating a received signal, Cases of the plurality of tuner packages are grounded, and each of the plurality of tuner packages has an internal antenna terminal for engaging the distribution coaxial cable, and one of the plurality of tuner packages has an external terminal. An external antenna terminal connected to the antenna provided in the antenna package, and an internal antenna terminal provided in the tuner package including the external antenna terminal is provided in the vicinity of the external antenna terminal, and is provided in each of the plurality of tuner packages. Connected to the internal antenna terminal by the coaxial cable for distribution, the internal antenna terminal The length of the distribution coaxial cable to provide a recording and reproducing apparatus characterized by being arranged such that the shortest.

According to this configuration, the number of parts is reduced as compared with the conventional tuner, and the number of parts to be manufactured can be reduced. Thus, the cost and time required for manufacture and assembly can be reduced.

According to the present invention, there is provided a TV broadcast tuner, a TV receiver, and a recording / reproducing apparatus equipped with the tuner, which have countermeasures against interference waves with a simple structure and can reduce manufacturing and assembly costs of components. Can be provided.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a perspective view of an example of a tuner according to the present invention. The tuner A shown in FIG. 1 is not limited thereto, but here,
The first tuner package 1, the second tuner package 2, and the distribution coaxial cable 3 that connects the first tuner package 1 and the second tuner package 2 are arranged in the receiver. is doing.

Each of the first tuner package 1 and the second tuner package 2 has conductive cases 11 and 21, and the case 1 is mounted on a substrate (not shown).
1 and 21 are grounded.

The first tuner package 1 has an external antenna terminal 10 for engaging an antenna wire (coaxial cable) 4 connected to an antenna (not shown) provided on the outside, and a coaxial cable 3 for distribution. And a first internal antenna terminal 12. The second tuner package 2 has a second internal antenna terminal 22 for engaging the distribution coaxial cable 3.

Each of the first tuner package 1 and the second tuner package 2 includes an IF circuit that demodulates a reception signal received by an antenna and input via the antenna line 4.

FIG. 2 shows a front view of the tuner shown in FIG. As shown in FIG. 2, the first tuner package 1 has an external antenna terminal 10 above the front surface. The external antenna terminal 10 is exposed to the outside of the TV receiver. A first internal antenna terminal 12 is formed below the first internal antenna terminal 12.
The second tuner package 2 is arranged side by side at a predetermined distance from the first tuner package 1. On the front surface of the second tuner package 2, the second internal antenna terminal 22 is disposed at the same height as the height H of the first internal antenna terminal 12.

The first internal antenna terminal 12 and the second internal antenna terminal 22 are connected by a distribution coaxial cable 3. The first internal antenna terminal 12 is arranged as close to the external antenna terminal 10 as possible, and the second internal antenna terminal 22 is connected to the first internal antenna terminal 12 by the distribution coaxial cable 3. In addition, the distribution coaxial cable 3 is disposed at the shortest position.

The operation of tuner A will be described below. A reception signal received by the antenna is input to the tuner A through the antenna line 4. At this time, the received signal has a very high frequency such as several tens of Mhz to several hundreds of MHz, and is easily affected by an interference wave. Therefore, a coaxial cable provided with a shield braid for preventing an interference wave is employed for the antenna line 4.

FIG. 3 shows a cross-sectional view of the antenna wire. The antenna line 4 includes a core wire 41 that transmits a reception signal, and a shield braid 42 that prevents electrical disturbance (noise) from occurring in the reception signal transmitted through the core wire 41. A holding member 43 having an insulating property between the core wire 41 and the shield braided wire 42
Are arranged such that the intervals between the core wire 41 and the shield braided wire 42 are substantially equal. Further, the outer periphery of the shield braided wire 42 is covered with an insulating coating 44. The distribution coaxial cable 3 is substantially the same in structure.

The shield braid 42 is grounded to prevent an external electric field or magnetic field from affecting the transmission signal. However, an interference wave may be input to the shield knitting wire 42, and at this time, the influence of the interference wave is greatly received.

When an interference wave is input to the shield braid 42 of the antenna line 4, the interference wave is input from the external antenna terminal 10 together with the received signal. When the impedance of the tuner A is high, the disturbing wave cannot escape and the video and / or audio is disturbed by the influence of the disturbing wave. The antenna line 4 is connected to the first tuner package 1, and the interference wave is released from the case 11 of the first tuner package 1 to the ground point.

However, since the impedance is high just by grounding the case 11 of the first tuner package 1, the interference wave cannot be escaped.
This is passed through the shield knitting wire to the case 21 of the second tuner package 2 and also escapes from the case 21 of the second tuner package 2.

At this time, the installation position of the distribution coaxial cable 3 is preferably close to the place where the interference wave is input to the first tuner package 1, that is, in the vicinity of the external antenna terminal 10. As a result, the impedance of the portions formed by the cases 11 and 21 and the distribution coaxial cable 3 of the first tuner package 1 and the second tuner package 2 can be reduced, and more interference waves can be connected. You can miss it. By causing the interference wave to escape from the ground point, when the received signal is demodulated by the first tuner package 1 and / or the second tuner package 2, the occurrence of disturbance in the video and / or audio is reduced. be able to.

In the above-described embodiment, a description has been given of an example in which two tuner packages are provided as tuners. However, the present invention is not limited to this, and two or more tuner packages may be provided. In this case, the interference wave may be missed by each tuner package, or may be missed from the tuner package to which the received signal is input and the tuner package adjacent thereto.

It is a perspective view of an example of the tuner concerning the present invention. FIG. 2 is a front view of the tuner illustrated in FIG. 1. It is sectional drawing of an antenna wire. It is a schematic perspective view of the conventional tuner.

Explanation of symbols

A tuner 1 first tuner package 10 external antenna terminal 11 case 12 first antenna terminal 2 second tuner package 21 case 22 second antenna terminal 3 coaxial cable for distribution 4 antenna wire 41 core wire 42 shield braid 43 holding Member 44 Coating

Claims (6)

A first tuner package, a second tuner package, and a distribution coaxial cable;
The first tuner package and the second tuner package include an IF circuit that demodulates a received signal,
The first tuner package has a case grounded, and has an external antenna terminal connected to an antenna provided outside, and a first internal antenna terminal engaged with the distribution coaxial cable.
The second tuner package has a case grounded, and has a second internal antenna terminal for engaging the distribution coaxial cable;
The first internal antenna terminal of the first tuner package is provided in the vicinity of the external antenna terminal, and the first internal antenna terminal and the second internal antenna terminal are connected by the distribution coaxial cable. And
A TV receiver having a tuner, wherein the internal antenna terminals are arranged so that the length of the distribution coaxial cable is the shortest. A first tuner package, a second tuner package, and a distribution coaxial cable;
The first tuner package and the second tuner package include an IF circuit that demodulates a received signal,
The first tuner package has a case grounded, and has an external antenna terminal connected to an antenna provided outside, and a first internal antenna terminal engaged with the distribution coaxial cable.
The second tuner package has a case grounded, and has a second internal antenna terminal for engaging the distribution coaxial cable;
The first internal antenna terminal of the first tuner package is provided in the vicinity of the external antenna terminal, and the first internal antenna terminal and the second internal antenna terminal are connected by the distribution coaxial cable. And
A recording / reproducing apparatus having a tuner, wherein the internal antenna terminal is arranged so that the length of the distributing coaxial cable is shortest. A first tuner package, a second tuner package, and a distribution coaxial cable;
The first tuner package and the second tuner package include an IF circuit that demodulates a received signal,
The first tuner package has a case grounded, and has an external antenna terminal connected to an antenna provided outside, and a first internal antenna terminal engaged with the distribution coaxial cable.
The second tuner package has a case grounded, and has a second internal antenna terminal for engaging the distribution coaxial cable;
The first internal antenna terminal of the first tuner package is provided in the vicinity of the external antenna terminal, and the first internal antenna terminal and the second internal antenna terminal are connected by the distribution coaxial cable. And
The tuner characterized in that the internal antenna terminal is arranged so that the length of the distributing coaxial cable is the shortest. It has a plurality of tuner packages and a distribution coaxial cable.
The plurality of tuner packages have built-in IF circuits that demodulate received signals,
The plurality of tuner packages have a grounded case, and each of the plurality of tuner packages has an internal antenna terminal that engages the distribution coaxial cable.
One of the plurality of tuner packages includes an external antenna terminal connected to an antenna provided outside,
The internal antenna terminal provided in the tuner package having the external antenna terminal is provided in the vicinity of the external antenna terminal, and the internal antenna terminal provided in each of the plurality of tuner packages is connected by the distribution coaxial cable. And
The tuner characterized in that the internal antenna terminal is arranged so that the length of the distributing coaxial cable is the shortest. It has a plurality of tuner packages and a distribution coaxial cable.
The plurality of tuner packages have built-in IF circuits that demodulate received signals,
The plurality of tuner packages have a grounded case, and each of the plurality of tuner packages has an internal antenna terminal that engages the distribution coaxial cable.
One of the plurality of tuner packages includes an external antenna terminal connected to an antenna provided outside,
The internal antenna terminal provided in the tuner package having the external antenna terminal is provided in the vicinity of the external antenna terminal, and the internal antenna terminal provided in each of the plurality of tuner packages is connected by the distribution coaxial cable. And
The TV receiver, wherein the internal antenna terminal is arranged so that the length of the distribution coaxial cable is shortest. It has a plurality of tuner packages and a distribution coaxial cable.
The plurality of tuner packages have built-in IF circuits that demodulate received signals,
The plurality of tuner packages have a grounded case, and each of the plurality of tuner packages has an internal antenna terminal that engages the distribution coaxial cable.
One of the plurality of tuner packages includes an external antenna terminal connected to an antenna provided outside,
The internal antenna terminal provided in the tuner package having the external antenna terminal is provided in the vicinity of the external antenna terminal, and the internal antenna terminal provided in each of the plurality of tuner packages is connected by the distribution coaxial cable. And
The recording / reproducing apparatus, wherein the internal antenna terminal is arranged so that the length of the distributing coaxial cable is the shortest.

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