JP2005050659A - Television terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a television terminal capable of reducing loss with respect to even a high frequency signal. <P>SOLUTION: The television terminal is composed of a container 3 made of metal, an input terminal 1 and an output terminal arranged at the container 3 and to which a transmission wire transmitting signals for television broadcast are connected, respectively, and a conduction path 4 electrically connecting the input terminal 1 to the output terminal at the inside of the container 3. Protruded parts 31 are formed at both sides of the inner face of the container 3 pinching the conduction path 4, and the impedance of the input terminal 1 and the output terminal is made to match with that of the conduction path 4 by using stray capacitance generated between the protruded parts 31 and the conduction path 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a television terminal used for providing a terminal for connecting a transmission line connected to a television receiver on a construction surface.

  2. Description of the Related Art Conventionally, there has been provided a television terminal including an output terminal for connecting a transmission line connected to a television receiver and an input terminal for connecting a transmission line connected to an antenna or the like.

  An example of this type of television terminal is shown in FIG. 11 (see, for example, Patent Document 1). The television terminal includes a container body 3 formed by die casting, for example, and provided with an input terminal 1 and an output terminal 2. The input terminal 1 and the output terminal 2 are so-called F-type connectors to which coaxial cables as transmission lines for transmitting television broadcast signals are connected. As shown in FIG. The integrally formed tubular portions 11 and 21 and the core springs 13 that are held inside the tubular portions 11 and 21 via the insulators 12 and 22 and sandwich the core wire (not shown) of the coaxial cable. 23 and terminal core wires 14 and 24 that are electrically connected to the core springs 13 and 23 and project into the container 3. Inside the container 3, the terminal core wires 14 of the input terminal 1 and the terminals of the output terminal 2 are electrically and mechanically connected to the terminal core wires 14 and 24 of the input terminal 1 and the output terminal 2, for example, by soldering. A conductive path 4 that electrically connects the core wire 24 is provided. Here, since metal is used for the material of the container 3 in order to prevent noise from entering the conductive path 4, the conductive path 4 is arranged away from the inner surface of the container 3 in order to maintain insulation. .

The container 3 is held by the holding body H so that the input terminal 1 and the output terminal 2 are exposed, for example, as shown in FIG. The holding body H is disposed on the construction surface by using a mounting frame (not shown), and is a window of the mounting frame used in the construction of the embedded wiring apparatus referred to as a large angle continuous type in Japanese Industrial Standard (see JIS C8304). It is formed to a dimension that can be attached to three holes (so-called one module dimension).
Japanese Patent Laid-Open No. 11-54172 (page 4-6, FIG. 1)

  By the way, in recent years, the frequency of signals used for television broadcasting has increased. For example, a high frequency close to 2150 MHz is used in a service using right-handed circular polarization of 110 degree CS digital broadcasting, and a high frequency up to 2600 MHz is used in a service using left-handed circular polarization. When the signal becomes higher in frequency, impedance matching between the conductive path 4 of the television terminal and the input terminal 1 and the output terminal 2 is deteriorated. Therefore, in the conventional television terminal, between the input terminal 1 and the output terminal 2 and the conductive path 4. The loss due to reflection at the surface becomes so large that it cannot be ignored.

  The present invention has been made in view of the above reasons, and an object of the present invention is to provide a television terminal capable of reducing loss even for a high-frequency television broadcast signal.

  The invention of claim 1 includes a metal container, an input terminal and an output terminal provided on the container, to which transmission lines for transmitting television broadcast signals are respectively connected, and an input terminal inside the container. And an impedance matching means for matching the impedances of the input terminal, the output terminal, and the conductive path using a stray capacitance generated between the container and the conductive path. It is characterized by that.

  According to this configuration, impedance can be matched by the impedance matching means corresponding to the high frequency of the signal, and the input terminal, the output terminal, and the conductive path are also connected to the high frequency television broadcast signal. It is possible to reduce loss due to reflection at the surface.

  According to a second aspect of the present invention, in the first aspect of the present invention, the impedance matching means comprises a protrusion protruding from the inner surface of the vessel body.

  According to this configuration, since only the protrusion is provided on the container, the effect can be easily obtained with a slight change.

  According to a third aspect of the present invention, in the first aspect of the present invention, the impedance matching means comprises a plurality of protrusions arranged in parallel along the conductive path on the inner surface of the vessel body.

  According to this configuration, the impedance can be set with a higher degree of freedom than in the case where one protrusion is used, and therefore it is easier to match the impedance and reduce the loss.

  The invention of claim 4 is the invention of claim 2 or claim 3, wherein a holding portion for holding a printed wiring board for mounting a termination circuit or a current blocking circuit is provided on the protrusion. And

  According to this configuration, it is possible to share a container body between a case where a termination circuit and a current blocking circuit are necessary and a case where the circuit is not necessary.

  According to a fifth aspect of the present invention, in the second aspect of the present invention, the input terminal and the output terminal are each formed of an F-type connector into which a core wire of a coaxial cable as a transmission line is inserted, and the directions of the input terminal and the output terminal are The direction in which the core wire of the coaxial cable is inserted is in a direction intersecting each other, and a protrusion is provided at a position sandwiching the conductive path in the direction in which the core wire of the coaxial cable is inserted and removed from the input terminal.

  The invention of claim 6 is characterized in that, in the invention of claim 2, the projecting portion has a shape surrounding the entire circumference of the conductive path.

  According to this configuration, since the impedance of the conductive path can be set with a higher degree of freedom, it becomes easier to match the impedance and reduce the loss.

  According to a seventh aspect of the present invention, in the first aspect of the invention, the entire inner surface of the container is used as an impedance matching means, and impedance matching between the input terminal and the output terminal can be achieved by a stray capacitance between the conductive path and the container. The distance between the conductive path and the container is set.

  The invention of claim 8 is characterized in that, in the invention of claim 1, the impedance matching means comprises a wide portion having a larger width dimension than other portions provided in the conductive path.

  According to this configuration, since the body can be shared with the conventional television terminal, the cost for improvement can be reduced.

  According to a ninth aspect of the present invention, in the first aspect of the invention, the impedance matching means is provided in the conductive portion, and the cross-sectional area in a cross section orthogonal to the direction in which the input terminal and the output terminal are arranged is larger than that in other portions. It consists of a diameter part.

  According to this configuration, since the body can be shared with the conventional television terminal, the cost for improvement can be reduced.

  The invention of claim 10 is a metal container, an input terminal and an output terminal which are provided on the container and are connected to transmission lines for transmitting television broadcast signals, respectively, and the impedance is an input terminal and an output terminal. And an unbalanced transmission line that electrically connects the input terminal and the output terminal inside the container body.

  According to this configuration, since the impedances of the unbalanced transmission line, the input terminal, and the output terminal are matched in response to the higher frequency of the signal, the input terminal and the output terminal can be used for high-frequency television broadcasting signals. And loss due to reflection at the junction between the conductive path and the conductive path can be reduced. In addition, since the body can be shared with the conventional television terminal, the cost for improvement can be reduced.

  As described above, according to the present invention, the impedance of the input terminal, the output terminal, and the conductive path is matched using the stray capacitance generated between the container and the conductive path in response to the higher frequency of the signal. Since the input terminal and the output terminal are electrically connected via an unbalanced transmission line whose impedance is matched with that of the input terminal and the output terminal, the input terminal and the output terminal can be used for high-frequency television broadcasting signals. And loss due to reflection between the conductive path and the unbalanced transmission path can be reduced.

(Embodiment 1)
Since the basic configuration of this embodiment is the same as that of the conventional example, common portions are denoted by the same reference numerals, description thereof is omitted, and only different portions are described.

  In the present embodiment, as shown in FIG. 1, the insertion / removal direction (hereinafter referred to as “vertical direction”) of the inner surface of the container 3 to the input terminal 1 and the insertion / removal direction (hereinafter referred to as “front-rear direction”) of the output terminal 2. ”). The protrusions 31 having a rectangular cross section are provided on both sides of the conductive path 4 in a direction intersecting (hereinafter referred to as“ left-right direction ”). Other configurations are the same as in the conventional example.

  According to the above configuration, even for high-frequency television broadcasting signals, the conductive paths can be selected by appropriately selecting the distances X1 and X2 between the protrusions 31 and the conductive paths 4 and the width dimensions X3 and X4 of the protrusions 31. 4 and adjusting the stray capacitance between the body 3 and the impedance of the conductive path 4 and the input terminal 1 and the output terminal 2 are easily matched, and between the conductive path 4 and the input terminal 1 and the output terminal 2 Loss due to reflection can be reduced. In addition, since only the protrusion 31 is provided from the conventional one, the manufacturing is simple and the cost increase is suppressed.

  The shape of the protrusion 31 is not limited to the above shape, and may be a curved surface as shown in FIG. Further, the protrusions 31 may be provided above and below the conductive path 4 as shown in FIG.

(Embodiment 2)
Since the basic configuration of the present embodiment is the same as that of the first embodiment, common portions are denoted by the same reference numerals, description thereof is omitted, and only different portions are described.

  In this embodiment, as shown in FIG. 4A, two sets of protrusions 31 are provided along the conductive path 4 in the front-rear direction, and the upper surface of the protrusion 31 and the body 3 are provided as shown in FIG. A gap is provided between the inner surface of each of the two protrusions 31 and ribs 32 are provided on the upper surfaces of the two protrusions 31 located diagonally.

  According to the above configuration, as shown in FIG. 5, the printed wiring board 5 provided with the notches 51 can be held in the container 3 by engaging the ribs 32 in the notches 51. That is, the rib 32 is a holding part. In the example of FIG. 5, the input terminal 1 and the output terminal 2 are connected to the conductive pattern 52 provided on the printed wiring board 5 instead of the conductive path 4 and the DC blocking chip capacitor 53 mounted on the printed wiring board 5. And is electrically connected through.

  According to the above configuration, it is possible to reduce the manufacturing cost by sharing the container 3 between the television terminal having the DC blocking capacitor and the terminating resistor and the television terminal not having the resistor.

(Embodiment 3)
Since the basic configuration of the present embodiment is the same as that of the first embodiment, common portions are denoted by the same reference numerals, description thereof is omitted, and only different portions are described.

  The present embodiment is characterized in that the protrusions 31 are provided over the entire circumference of the conductive path 4 as shown in FIG. Specifically, as shown in FIG. 6 (b), the container 3 of the present embodiment has a recess formed on the right surface, a rib 31a projecting on the left inner surface, and the conductive path 4 accommodated therein. A main portion 3a, a U-shaped member 31b made of a conductive material and having an outer peripheral shape similar to the inner peripheral shape of the vessel body 3 and constituting the protrusion 31 together with the rib 31a; It consists of a lid 3b that closes 3a. Other configurations are the same as those of the first embodiment.

  According to the above configuration, since the impedance can be selected with a higher degree of freedom than in the first embodiment, it becomes easier to match the impedance.

  Note that the cross-sectional shape of the inner periphery of the protrusion 31 may be any shape, for example, a circular shape as shown in FIG.

(Embodiment 4)
Since the basic configuration of this embodiment is the same as that of the conventional example, common portions are denoted by the same reference numerals, description thereof is omitted, and only different portions are described.

  As shown in FIGS. 7A and 7B, the present embodiment reduces the distance between the inner wall of the vessel 3 and the conductive path 4 by increasing the overall thickness of the vessel 3, By increasing the stray capacitance between the inner wall of the body 3 and the conductive path 4, the impedances of the conductive path 4, the input terminal 1 and the output terminal 2 are matched. Other configurations are the same as in the conventional example.

  In addition, the cross-sectional shape of the space inside the vessel body 3 may be circular as shown in FIG.

(Embodiment 5)
In Embodiments 1 to 4, the shape of the vessel body 3 is different from the conventional example, and the vessel body 3 cannot be shared with the conventional example. Therefore, it is necessary to newly manufacture a mold or the like to provide the vessel body 3 There is. In this embodiment, the body 3 can be shared with the conventional example, and the cost required for improvement is reduced.

  Since the basic configuration of this embodiment is the same as that of the conventional example, common portions are denoted by the same reference numerals, description thereof is omitted, and only different portions are described.

  In this embodiment, as shown in FIG. 8A, the input terminal 1 and the output terminal 2 are electrically connected via the core wire 61 of the unbalanced transmission line 6 whose impedance is matched with that of the input terminal 1 and the output terminal 2. It is characterized by being connected. As shown in FIG. 8B, the unbalanced transmission line 6 includes a core wire 61, an insulator 62 that surrounds the entire circumference of the core wire 61, and a core wire 61 provided on the outer periphery of the insulator 62 by the insulator 62. And an insulated conductor 63 insulated. The outer conductor 63 is electrically connected to the container 3. Other configurations are the same as in the conventional example.

  According to the above configuration, by using the unbalanced transmission line 6 in which the impedance is matched with the input terminal 1 and the output terminal 2 corresponding to the high frequency of the signal, even for a high frequency television broadcast signal, Loss due to reflection between the unbalanced transmission line 6 and the input terminal 1 and output terminal 2 can be reduced. Moreover, the container 3 can be shared with the conventional television terminal, and the cost required for improvement can be reduced as compared with the first to fourth embodiments.

(Embodiment 6)
Since the basic configuration of this embodiment is the same as that of the conventional example, common portions are denoted by the same reference numerals, description thereof is omitted, and only different portions are described.

  As shown in FIG. 9A, the present embodiment is characterized in that the conductive path 4 is provided with a wide portion 41 whose vertical dimension is larger than that of other portions. Other configurations are the same as in the conventional example.

  According to the above configuration, the impedance of the conductive path 4 is matched with the input terminal 1 and the output terminal 2 using a stray capacitance between the wide portion 41 and the body 3 even for a signal for high-frequency television broadcasting. Thus, loss due to reflection between the conductive path 4 and the input terminal 1 and the output terminal 2 can be reduced. Moreover, the container 3 can be shared with the conventional television terminal, and the cost required for improvement can be reduced as compared with the first to fourth embodiments.

  In addition, as shown in FIG.9 (b), you may provide the wide part 41 in multiple places.

  Further, as shown in FIG. 10, an enlarged diameter portion 42 whose diameter is increased over the entire circumference of the conductive path 4 may be provided. Here, in FIG. 10B, the cross-sectional shape of the conductive path 4 is circular, but it may be any shape.

It is a figure which shows Embodiment 1 of this invention, (a) (b) is sectional drawing in a mutually different cross section. It is sectional drawing which shows another form same as the above. It is a figure which shows another form same as the above, (a) (b) is sectional drawing in a mutually different cross section. It is a figure which shows Embodiment 2 of this invention, (a) (b) is sectional drawing in a mutually different cross section. It is a figure which shows the state which added the printed wiring board to the same as the above, (a) (b) is sectional drawing in a mutually different cross section. It is a figure which shows Embodiment 3 of this invention, (a) is sectional drawing, (b) is sectional drawing which shows the state decomposed | disassembled, (c) is sectional drawing which shows another form. It is a figure which shows Embodiment 4 of this invention, (a) (b) is sectional drawing in a mutually different cross section, (c) is sectional drawing which shows another form. It is a figure which shows Embodiment 5 of this invention, (a) is sectional drawing which shows the whole, (b) is sectional drawing which shows an unbalanced transmission line. It is a figure which shows Embodiment 6 of this invention, (a) (b) is sectional drawing which shows a respectively different form. It is a figure which shows another form same as the above, (a) (b) is sectional drawing in a mutually different cross section. It is a figure which shows an example of the container of a television terminal, (a) is a front view, (b) is a top view. It is a prior art example, (a) is AA sectional drawing of Fig.11 (a), (b) is BB sectional drawing of FIG.11 (b), (c) is C of FIG.11 (b). It is explanatory drawing which shows the structure in -C cross section. It is a figure which shows the state which mounted | wore the support body same as the above, (a) is a right view, (b) is a front view, (c) is a rear view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Input terminal 2 Output terminal 3 Body 4 Conductive path 5 Printed wiring board 6 Unbalanced transmission line 31 Protrusion 32 Rib 41 Wide part 42 Expanded part

Claims (10)

  Electrically connect a metal container, input terminals and output terminals connected to transmission lines for transmitting television broadcast signals provided on the container, and input and output terminals inside the container. A television terminal comprising: a conductive path connected to the terminal; and impedance matching means for matching impedances of the input terminal, the output terminal, and the conductive path using a stray capacitance generated between the body and the conductive path .   2. The television terminal according to claim 1, wherein the impedance matching means comprises a protrusion protruding from the inner surface of the container.   2. The television terminal according to claim 1, wherein the impedance matching means comprises a plurality of protrusions arranged in parallel along the conductive path on the inner surface of the body.   4. The television terminal according to claim 2, wherein a holding portion for holding a printed wiring board for mounting a termination circuit or a current blocking circuit is provided on the protrusion.   Each of the input terminal and the output terminal is an F-type connector into which a coaxial cable core as a transmission line is inserted, and the direction of the input terminal and the output terminal intersects with the direction in which the coaxial cable core is inserted. 3. The television terminal according to claim 2, wherein a projection is provided at a position that sandwiches the conductive path in a direction that is a direction in which the core wire of the coaxial cable is inserted into and removed from the input terminal.   The television terminal according to claim 2, wherein the protrusion has a shape surrounding the entire circumference of the conductive path.   The entire inner surface of the container is used as impedance matching means, and the distance between the conductive path and the container is set so that impedance matching between the input terminal and output terminal can be achieved by the stray capacitance between the conductive path and the container. The television terminal according to claim 1.   2. The television terminal according to claim 1, wherein the impedance matching means includes a wide portion having a width dimension larger than that of other portions provided in the conductive path.   The impedance matching means is provided in the conductive portion, and includes a diameter-enlarged portion having a larger cross-sectional area in a cross-section orthogonal to the direction in which the input terminal and the output terminal are arranged than in other portions. TV terminal.   Metal housing, input and output terminals connected to transmission lines for transmitting television broadcasting signals provided on the housing, and impedance matched to the input and output terminals, and the interior of the housing A television terminal comprising: an unbalanced transmission line for electrically connecting the input terminal and the output terminal.

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