JP3049870B2 - Card type electronic tuner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic tuner, and more particularly to an improvement in the form of such an electronic tuner.

[0002]

2. Description of the Related Art A television receiver requires a tuner, and as such a tuner, an electronic tuner has recently been widely used. An electronic tuner is often provided with a tuner circuit section and a channel control circuit section for selectively tuning both UHF and VHF signals.

[0003] Such an electronic tuner is built in the main body of a television receiver.

[0004]

At present, in addition to the above-mentioned television receivers, for example, a personal computer having a display, such as a so-called 8-mm video device, is commonly used as a device having a video display function. And information equipment. As a matter of course,
Since these video and information devices do not have a built-in tuner, they cannot receive television broadcasts and output their video and audio.

[0005] However, these video and information devices often already have sufficient functions to be used as a television receiver if they have a tuner. Therefore, if these video equipment or information equipment can be used as a television receiver if necessary, the use of these equipment can be expanded, and as a result, the commercial value can be increased. it can.

Accordingly, the present invention seeks to satisfy the above-mentioned needs by improving the structure of the electronic tuner.

[0007]

According to the present invention, a card-type electronic tuner is provided to solve the above-mentioned technical problems.

This card type electronic tuner has a card type case, a tuner circuit section housed in the case,
A circuit board forming a channel control circuit section and a demodulation circuit section; and a plurality of connector conductors electrically connected to the circuit board and arranged along one side of the case.

The above-mentioned case has a frame made of resin for positioning the circuit board, and the above-mentioned plurality of connector conductors are directly held by this frame.

[0010]

According to the present invention, the circuits necessary for the electronic tuner, including the peripheral circuits required for reception, are housed in a card-type case, and the input / output of signals is performed via the connector conductor. it can.

[0011]

Therefore, according to the present invention, a card-type electronic tuner such as an IC memory card can be obtained. Such a card-type electronic tuner is easy to store and carry, and is suitable for handling as an optional accessory for various video or information devices. For this reason, it is not necessary to store functions that are not always used, such as a function as a television receiver in a video device or an information device, in the main body of these devices, so that the size and weight of such devices are increased. Can be prevented.

Further, the card-type electronic tuner according to the present invention includes all necessary circuits for the tuner, including peripheral circuits necessary for reception, and enables input / output of signals via the connector conductor. Thus, when necessary, they can be made to function as a television receiver by, for example, attaching them to the main body of a video device or information device. In this case, the card-type electronic tuner can be mounted on the main body of the video device or the information device, for example, a slot is provided, and a connector paired with a connector conductor provided in the card-type electronic tuner in relation to this slot. A conductor may be provided. If such a slot can be shared with another function card, it becomes easy to provide a plurality of optional functions to one device by, for example, switching with a switch.

[0013] Further, since the connector conductor is directly held by the frame, the position of the connector conductor does not shift with respect to the frame and thus to the card type case. Therefore, as described above, when the card-type electronic tuner is inserted into the slot provided in the main body of the video device or the information device, the connector conductor on the electronic tuner side is
Electrical connection to the connector conductor on the slot side can be ensured.

[0014]

FIG. 1 is a perspective view showing an external appearance of a card-type electronic tuner 1 according to an embodiment of the present invention. FIG.
FIG. 2 is an enlarged sectional view taken along line II-II in FIG. 1. FIG.
FIG. 2 is a block diagram showing an electric circuit provided in the card-type electronic tuner 1.

The card type electronic tuner 1 has a card type case 2. Case 2 is frame 3, frame 3
An upper cover 4 for closing the upper opening of the frame 3 and a lower cover 5 for closing the lower opening of the frame 3 are provided. Such a case 2 is preferably made substantially the same size as a commonly used IC memory card.

The frame 3 is formed of a molded product made of a synthetic resin having increased rigidity, such as glass fiber reinforced polyphenylene sulfide, polyethylene terephthalate, and polycarbonate. Such a frame 3 may be provided with metal plating, conductive coating, or the like on necessary portions for the purpose of improving the shielding properties.

The upper cover 4 and the lower cover 5 are made of a conductive material such as a metal plate in order to exhibit a shielding property.

In such a case 2, a circuit board is housed. The circuit board comprises a printed circuit board 6 in this embodiment. On the printed circuit board 6, for example,
A double-sided wiring type made of a glass epoxy substrate having a thickness of 0.5 mm is used. On the upper surface of the printed circuit board 6, required electronic components 7 are surface-mounted. On the lower surface of the printed circuit board 6, required wiring and ground wiring are provided, which are electrically connected to the wiring on the upper surface via through holes. Although not shown, the lower surface of the printed circuit board 6 is covered with an insulating film.

The printed circuit board 6 may be made of a ceramic material, for example, or may have a multilayer structure. The outer surfaces of the lower cover 5 and the upper cover 4 can be used as appropriate for printing or the like.

A plurality of connector conductors 8 are arranged, for example, along the short side of case 2. Although details of these connector conductors 8 will be described later with reference to FIG. 4, these connector conductors 8 are electrically connected to predetermined conductive lands on the printed circuit board 6.

The printed circuit board 6 on which the required electronic components 7 are mounted is positioned mainly in the case 2 by the frame 3. The upper cover 4 and the lower cover 5 are fixed to the frame 3 by, for example, screwing, bonding, welding, or the like.

Various circuits are formed on the printed circuit board 6 as represented by the electronic components 7 shown in FIG. A circuit formed on the printed circuit board 6 is shown in FIG.

Referring to FIG. 3, circuits formed on printed circuit board 6 are roughly divided into a tuner circuit section 9, a channel control circuit section 10, and a demodulation circuit section 11.
Further, the tuner circuit section 9 includes a VHF circuit section 12 and a UHF circuit section.
An HF circuit unit 13 is provided.

U input from the U / V signal input terminal 14
The HF / VHF signal is distributed by the distributor 15 and input to the corresponding circuit unit 12 or 13. These circuit units 12 and 13 are respectively provided with bandpass filters 16
And 17, amplifiers 18 and 19, and bandpass filters 20 and 21.

The channel control circuit section 10 has a channel control circuit 22, and the output of the channel control circuit 22 is input to local oscillation circuits 23 and 24. The local oscillation signal output from one local oscillation circuit 24 is mixed with the high-frequency signal output from the band-pass filter 21 of the UHF circuit unit 13 in the mixing circuit 25, and then amplified in the mixing / amplification circuit 26. You. On the other hand,
The local oscillation signal output from the local oscillation circuit 23 is mixed in the mixing / amplification circuit 26 with the high-frequency signal output from the bandpass filter 20 of the VHF circuit unit 12.

The intermediate frequency signal output from the mixing / amplifying circuit 26 is input to an amplifier 28 provided in the demodulation circuit section 11 through a band pass filter 27. The signal amplified by the amplifier 28 is input to the demodulation circuit 30 via the surface acoustic wave filter 29. In the demodulation circuit 30, the video signal is subjected to AM detection and the audio signal is subjected to FM detection, whereby the video signal and the audio signal are demodulated to be supplied to the video signal output terminal 31 and the audio signal output terminal 32, respectively. Also, from the demodulation circuit 30,
The synchronization signal is supplied to the synchronization signal output terminal 33.

Further, the above-mentioned printed circuit board 6 has a power supply voltage terminal 34 for supplying a power supply voltage to the entire circuit formed thereon, and a channel control circuit section 10.
A tuning voltage terminal 35 for supplying a tuning voltage to the
A clock terminal 36 for supplying a data signal and an enable signal, a data terminal 37 and an enable terminal 35, and a ground terminal 39 are formed.

The terminals 14, 31 to 39 thus formed on the printed circuit board 6 are electrically connected to the corresponding connector conductors 8, respectively.

The above-described tuner circuit section 9, channel control circuit section 10 and demodulation circuit section 11 are respectively shown in FIG.
, The first area 40 and the second area 4 partitioned by broken lines
The first and third regions 42 are arranged. First area 40
VHF circuit section 12 included in tuner circuit section 9 in FIG.
And the positional relationship between the UHF circuit unit 13 can be arbitrarily changed. In the case 2, a shield plate for separating the tuner circuit section 9, the channel control circuit section 10, and the demodulation circuit section 11 from each other is arranged. Such a shield plate is electrically connected to the upper cover 4 and the lower cover 5 and the ground land on the printed circuit board 6,
The overall shielding performance is ensured. FIG. 2 shows a shield plate 43 which is one of the shield plates described above. The shield plate 43 is attached along a partition wall 44 provided so as to cross the main surface of the printed circuit board 6 in the frame 3.

FIG. 4 is an enlarged view of the left end where the connector conductor 8 of the card-type electronic tuner 1 shown in FIG. 2 is arranged.

The connector conductor 8 is in the form of a pin, and is held by the frame 3 such that the end surface 46 of the head 45 having a relatively large diameter is exposed from the case 2. The end surface 46 preferably defines a spherical concave portion, so that the reliability of electrical contact between the connector conductor 8 and the mating connector conductor is enhanced.

The connector conductor 8 is held by the frame 3 by inserting the connector conductor 8 into a predetermined position of the frame 3 after obtaining the frame 3 by, for example, resin molding. The frame 3 is provided with various shapes for positioning the connector conductor 8 thus inserted. For example, the frame 3 includes a connector conductor 8
An inner peripheral surface 47 that contacts the outer peripheral surface of the head 45, a wall 48 that contacts the head 45 so as to define the end of insertion of the connector conductor 8, and a wall 4 that prevents the connector conductor 8 from floating.
9, etc. are formed. The connector conductor 8 has
A retaining groove 50 is provided, and a retaining projection 51 that fits into the retaining groove 50 is provided on the frame 3.

As described above, the connector conductor 8 is connected to the frame 3
After the printed circuit board 6 is positioned at
Incorporated in. At this time, the electrical connection between the connector conductor 8 and a predetermined conductive land on the printed circuit board 6 is achieved by the anisotropic conductive rubber 52. As the anisotropic conductive rubber 52, a large number of fibrous conductors are arranged in the sheet thickness direction, exhibit properties as a conductor in a direction perpendicular to the sheet surface, and as an insulator in a parallel direction. What shows the property of is used. The anisotropic conductive rubber 52 is arranged in a compressed state between the connector conductor 8, whose floating is prevented by the wall 49, and the printed circuit board 6, and is disposed between the connector conductor 8 and the printed circuit board 6. Has achieved stable electrical continuity. As described above, when the anisotropic conductive rubber 52 is used, it is only necessary to properly perform the alignment between the plurality of connector conductors 8 and the printed circuit board 6. This can be achieved without performing attachment or the like.

FIG. 4 shows that the upper cover 4 is
a and the outer cover portion 4b are shown as a double structure. In this way, with the double structure, even if a hole for adjusting the tuner circuit portion 9 (FIG. 3) is provided in the inner cover portion 4a, such a hole can be covered by the outer cover portion 4b. .

FIG. 4 shows a double-sided adhesive sheet 53 between the printed circuit board 6 and the lower cover 5. Therefore, in this embodiment, the double-sided adhesive sheet 53
Thereby, the printed circuit board 6 and the lower cover 5 are fixed to each other, and the lower cover 5 is fixed to the frame 3.

FIG. 5 shows another embodiment of the present invention. In FIG. 5, elements corresponding to the elements shown in FIG. 4 are denoted by the same reference numerals, and redundant description will be omitted.

In the embodiment shown in FIG. 5, the connector conductor 8
The position of the retaining groove 50a provided in the base member is selected so as to contact the anisotropic conductive rubber 52. Therefore, the retaining projection 51 a is also provided on the wall 49. According to this embodiment, the anisotropic conductive rubber 52 is provided with the retaining groove 50.
a, the connector conductor 8 is less likely to come off from the frame 3.

FIG. 6 shows still another embodiment of the present invention. In FIG. 6 as well, elements corresponding to the elements shown in FIG. 4 are denoted by the same reference numerals, and redundant description will be omitted.

In the embodiment shown in FIG. 6, a retaining projection 54 is provided on the connector conductor 8 instead of the retaining groove. On the other hand, a retaining groove 55 for receiving the retaining projection 54 is provided on the frame 3 side. Therefore, according to this embodiment, the connector conductor 8 is prevented from coming off by fitting the retaining protrusion 54 into the retaining groove 55. Further, also in this embodiment, since the retaining projection 54 acts to press the anisotropic conductive rubber 52, the connector conductor 8 is prevented from coming off also by the anisotropic conductive rubber 52. The wall 4 provided on the frame 3
The hole 56 defined by 8 is sized to allow passage of the retaining projection 54.

FIG. 7 shows still another embodiment of the present invention. In FIG. 7 as well, elements corresponding to the elements shown in FIG. 4 are denoted by the same reference numerals, and redundant description will be omitted.

In the embodiment shown in FIG. 7, the connector conductor 8
The electrical connection between the substrate and predetermined conductive lands on the printed circuit board 6 is achieved by the solder 57. In order to enable such application of the solder 57, the frame 3 is provided with an opening 58. The opening 58 can be covered with the outer cover portion 4b by changing the shape of the outer cover portion 4b included in the upper cover 4. In addition,
When the connector conductor 8 is electrically connected to the printed circuit board 6 by the solder 57 as in this embodiment, some of the elements for positioning the connector conductor 8 provided on the frame 3 are omitted. Can be.

FIGS. 8 and 9 show still another embodiment of the present invention. Also in these drawings, elements corresponding to the elements shown in FIG. 4 are denoted by the same reference numerals, and redundant description will be omitted.

In the embodiment shown in FIGS. 8 and 9, a clip-shaped terminal 59 is used for electrical connection between the connector conductor 8 and the printed circuit board 6. The clip-shaped terminal 59 is preferably made of a copper alloy material having excellent spring properties, conductivity, solderability, and the like. Clip-shaped terminal 59
May be plated. Such a clip-shaped terminal 59 is fixed on the printed circuit board 6 in advance by soldering or the like, like the other electronic components 7 (FIG. 2).

After the connector conductors 8 are held by the frame 3, the printed circuit board 6 to which the clip-like terminals 59 are attached is assembled in the direction indicated by the arrow 60 in FIG. As a result, the connector conductor 8 is received in the clip-shaped terminal 59, and the clip-shaped terminal 59 is
The connector conductor 8 is elastically held. Thereby, an electrical connection between the connector conductor 8 and the printed circuit board 6 is achieved.

In the embodiment shown in FIGS. 8 and 9, after the printed circuit board 6 is assembled in the frame 3,
The connector conductor 8 may be mounted on the frame 3.

FIGS. 10 to 12 show still another embodiment of the present invention. Also in these drawings, elements corresponding to the elements shown in FIG. 4 are denoted by the same reference numerals, and redundant description will be omitted.

In the embodiment shown in FIGS. 10 to 12,
A modification of the clip-like terminal 59 in the embodiment shown in FIGS. 8 and 9 is used. In this embodiment, a clip-shaped terminal 61 made of a metal plate bent in an L-shape as a whole is used. Other points of the clip-shaped terminal 61 are substantially the same as those of the clip-shaped terminal 59 described above.

Referring to FIG. 12, a plurality of connector conductors 8
Are close to each other, so that the clip-like terminals 6
(1) If there is a possibility of undesired contact with each other, the position of the clip-shaped terminal 61 is changed between adjacent ones.
May be displaced in the axial direction.

As described above, the connector conductor 8 included in the present invention
Various embodiments have been described in connection with the above, but other modifications are possible within the scope of the present invention.

For example, the connector conductor 8 has a circular cross section, but may have other cross sectional shapes.

Although the connector conductor 8 is in the form of a pin, it may be in the form of a socket for receiving a connector conductor paired with such a connector conductor.

Although not shown in the illustrated embodiment, a receiving antenna may be externally or internally provided in such a card-type electronic tuner.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an external appearance of a card-type electronic tuner 1 according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II in FIG.

FIG. 3 is a block diagram showing an electric circuit formed on the printed circuit board 6 shown in FIG.

4 is an enlarged cross-sectional view showing a left end portion of the card-type electronic tuner 1 shown in FIG.

FIG. 5 is a sectional view corresponding to FIG. 4, showing another embodiment of the present invention.

FIG. 6 is a cross-sectional view corresponding to FIG. 4, showing still another embodiment of the present invention.

FIG. 7 is a cross-sectional view corresponding to FIG. 4, showing still another embodiment of the present invention.

FIG. 8 is a cross-sectional view corresponding to FIG. 4, showing still another embodiment of the present invention.

FIG. 9 is a sectional view taken along lines IX-IX in FIG. 8;

FIG. 10 is a cross-sectional view corresponding to a part of FIG. 4, showing still another embodiment of the present invention.

FIG. 11 is a sectional view taken along lines XI-XI in FIG. 10;

12 is a plan view showing a preferred arrangement of the clip-shaped terminals 61 shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Card-type electronic tuner 2 Case 3 Frame 6 Printed circuit board 7 Electronic component 8 Connector conductor 9 Tuner circuit unit 10 Channel control circuit unit 11 Demodulation circuit unit 12 VHF circuit unit 13 UHF circuit unit 45 Head 47 Inner peripheral surface 48, 49 Wall portion 50, 50a, 55 Retaining groove 51, 51a, 54 Retaining projection 52 Anisotropic conductive rubber 57 Solder 59, 61 Clip-shaped terminal

Continuation of front page (56) References JP-A-5-22165 (JP, A) JP-A-5-22167 (JP, A) JP-A-5-22166 (JP, A) JP-A-57-198588 (JP) , A) Fully open 1988-26468 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04B 1/06-1/08 H03J 5/00

Claims (1)

(57) [Claims] A card-type case, a circuit board housed in the case, the tuner circuit section, a channel control circuit section, and a demodulation circuit section; and a circuit board electrically connected to the circuit board; Case 1
A plurality of connector conductors arranged along one side, the case includes a frame made of resin, which positions the circuit board, and the plurality of connector conductors are directly held by the frame. Card type electronic tuner.