JPH05175862A - Card type electronic tuner - Google Patents

Abstract

PURPOSE:To provide the external electronic tuner enabling reception while being mounted to a main body only when it is desired to receive the images and sounds of a television at an equipment such as a personal computer or 8mm video not to normally require any tuner. CONSTITUTION:A printed circuit board 6 constituting a tuner circuit part 9, channel control circuit part 10 and demodulation circuit part 11 is built in a card type case, and a connector 8 to input/output signals to the printed circuit board 6 is arranged along one side of the case. A connector case part 4 is connected between free terminals 3a and 3b of a frame 3 composed of metal constituting one part of such a case. Thus, the obtained card type electronic tuner 1 is provided with high rigidity and can be handled similarly to conventionally generally used IC memory cards.

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 improving the form of such an electronic tuner.

[0002]

2. Description of the Related Art Television receivers require a tuner, and as such a tuner, an electronic tuner has been widely used recently. Electronic tuners often include tuner circuitry and channel control circuitry for selectively tuning both UHF and VHF signals.

Such an electronic tuner is built in the main body of the television receiver.

[0004]

As a device having an image display function which is generally used at present, in addition to the above-mentioned television receiver, for example, a personal computer having a display, such as a so-called 8 mm video device. , Information equipment, etc. As a matter of course,
Since a tuner is not built in these video equipment or information equipment, it is not possible to receive a television broadcast and output its video and audio.

However, in many cases, these video equipment and information equipment already have sufficient functions to be used as a television receiver as long as they have a tuner. Therefore, if these video equipment or information equipment can be used as a television receiver as necessary, the applications of these equipment can be expanded, and as a result, the commercial value can be increased. it can.

Therefore, the present invention seeks to meet the above-mentioned needs by improving the structure of an electronic tuner.

[0007]

In order to solve the above-mentioned technical problems, the present invention provides a card type electronic tuner.

This card type electronic tuner includes a card type case, a tuner circuit section housed in the case,
A circuit board that constitutes the channel control circuit section and the demodulation circuit section, and a connector that is electrically connected to the circuit board and that is arranged along one side of the case are provided.

Further, the above-mentioned case is the case of the circuit board 3
A frame made of metal, which surrounds a side in a U shape, and a connector case portion that connects between two free ends of the frame and positions the connector are provided.

[0010]

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

[0011]

Therefore, according to the present invention, an electronic tuner of card type as a whole, 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 equipment or information equipment. Therefore, it is not necessary to store a function that is not always used in the main body of these devices, such as a function as a television receiver in a video device or an information device. It can be prevented.

Further, the card type electronic tuner according to the present invention is provided with all circuits necessary for the tuner including peripheral circuits necessary for reception, and enables signal input / output through the connector. Therefore, they can be made to function as a television receiver by mounting them on the main body of the video equipment or the information equipment when necessary. In this case, the main body of the video equipment or the information equipment is provided with, for example, a slot in which the card type electronic tuner can be mounted, and a connector paired with the connector provided in the card type electronic tuner is associated with this slot. It should be provided. If such a slot can be shared with other function cards, it becomes easy to give a plurality of optional functions to one device by switching with a switch, for example.

Further, since the case is provided with the frame made of metal, it is possible to provide sufficient rigidity even in the case of a card type, that is, a thin case.

Further, since the connector case is prepared separately from the metal frame, it is easy to give the connector case a relatively complicated shape for positioning the connector. Therefore, it is possible to easily manufacture the card-type electronic tuner.

Further, since the frame is made of metal, it does not need to be so thick in order to obtain a predetermined rigidity, so there is no restriction on the arrangement of parts on the circuit board. Since the thickness of the connector case portion can be increased without interfering with the parts on the circuit board, it can be obtained by die casting or resin molding of aluminum, for example, and the card is economical. The weight of the entire model electronic tuner can be reduced.

[0016]

1 is a perspective view showing the appearance of a card type electronic tuner 1 according to an embodiment of the present invention. Figure 1
Shows an exploded perspective view of main elements included in such a card-type electronic tuner 1. In addition, FIG.
It is an expanded sectional view which follows the line III-III of FIG.

As shown in particular in FIG. 2, the card type electronic tuner 1 includes a card type case 2.
Such a case 2 is preferably a general-purpose I
It has substantially the same size as the C memory card. The case 2 includes a frame 3 made of U-shaped metal as shown in FIG. 1, a connector case portion 4 connecting between the two free ends 3a and 3b of the frame 3, and a cover 5 shown in FIG.

A circuit board is housed in the case 2. The circuit board comprises a printed circuit board 6 in this example. On the printed circuit board 6, for example,
A double-sided wiring type of glass epoxy substrate having a thickness of 0.5 mm is used. Required electronic components 7 and connectors 8 are surface-mounted on the upper surface of the printed circuit board 6. The lower surface of the printed circuit board 6 is provided with required wiring and ground wiring which are electrically connected to the wiring on the upper surface through the 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, for example, a ceramic material, or may have a multi-layered structure.

As described above, the connector 8 surface-mounted on the printed circuit board 6 is of a socket type and is arranged along the short side of the case 2, for example.

The printed circuit board 6 on which the required electronic components 7 and the connector 8 are mounted is surrounded by the frame 3 in the case 2 on three sides in a U-shape and positioned by the frame 3. 1 and 3 show a stepped portion 3c provided on the frame 3 for positioning the printed circuit board 6.

The frame 3 is made of, for example, an aluminum material. Such materials are optimal in terms of weight and strength. The frame 3 is preferably formed by bending a square bar material having a desired cross-sectional shape into a U shape. At this time, the fillet may rise in the bent portion, which can be flattened by cutting or crushing.

The connector case portion 4 has a relatively complicated shape for positioning the connector 8. Therefore, the connector case portion 4 is preferably manufactured by die casting of aluminum or resin molding. The connector case portion 4 is fixed to the frame 3 by screws (not shown) passing through screwing holes 3d and 3e provided in the free ends 3a and 3b of the frame 3. In addition, in order to fix the connector case portion 4 to the frame 3, it is possible to use a method such as caulking, press-fitting, welding, bonding, etc., in addition to screwing.

The cover 5 has a box shape in which only the portion for receiving the frame 3 is opened. It is preferable that the cover 5 is made of a conductive material such as metal because it exhibits a shielding property. The cover 5 can be integrally formed by drawing such a metal,
It can also be formed by bending a metal plate. Such a cover 5 is screwed into a screwing hole 3f provided in the frame 3 shown in FIG.
By mounting the screws 5a shown in
Fixed against. The upper and lower main surfaces of the cover 5 are appropriately
It can be used as a surface for printing or the like.

Instead of the cover 5 described above, two metal plates may be used and these metal plates may be bonded to the upper surface and the lower surface of the frame 3 by adhesion or the like.

As represented by the electronic component 7 shown in FIG. 1, various circuits are formed on the printed circuit board 6. The circuit constructed on this printed circuit board 6 is shown in FIG.

Referring to FIG. 4, the circuit formed on the printed circuit board 6 is roughly divided into a tuner circuit section 9, a channel control circuit section 10 and a demodulation circuit section 11.
Further, the tuner circuit unit 9 includes the VHF circuit unit 12 and the U
The 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 a bandpass filter 16
And 17, amplifiers 18 and 19, and bandpass filters 20 and 21.

The channel control circuit unit 10 includes 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 bandpass filter 21 of the UHF circuit unit 13 in the mixing circuit 25, and then amplified in the mixing / amplifying circuit 26. It 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 the amplifier 28 provided in the demodulation circuit section 11 through the bandpass 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 AM-detected and the audio signal is FM-detected to be demodulated into a video signal and an audio signal, which are applied to the video signal output terminal 31 and the audio signal output terminal 32, respectively. From the demodulation circuit 30,
A sync signal is applied to the sync 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 the channel control circuit section 10.
A tuning voltage terminal 35 for supplying a tuning voltage to the channel control circuit section 10,
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 contacts provided on the connector 8.

The tuner circuit section 9, the channel control circuit section 10 and the demodulation circuit section 11 described above are respectively shown in FIG.
As shown in FIG.
0, the second region 41 and the third region 42. The positional relationship between the VHF circuit unit 12 and the UHF circuit unit 13 included in the tuner circuit unit 9 in the first region 40 can be arbitrarily changed.

In FIG. 1, a box-shaped shield member 43 is mounted on the printed circuit board 6 so as to cover the first region 40, that is, the region where the tuner circuit portion 9 is formed. Further, another shield member 44 is mounted on the printed circuit board 6 so as to surround the second region 41, that is, the region where the channel control circuit unit 10 is formed. These shield members 43 and 44 are soldered to the printed circuit board 6 like the other electronic components 7.
Fixed on top. At this time, the shield members 43 and 4
4 is electrically connected to an earth land (not shown) on the printed circuit board 6 via the solder 45. The shield members 43 and 44 are connected to the printed circuit board 6
The printed circuit board 6 may be provided with a slot or the like for receiving a part of each of the shield members 43 and 44 in order to position the shield member 43 and 44.

The shield member 43 has a plurality of adjustment holes 4
6 is provided. Although not shown, electronic components to be adjusted are located below these adjustment holes 46.

In the above-described embodiment, the shield members 43 and 44 are provided in association with the tuner circuit section 9 and the channel control circuit section 10, respectively, but further, the shield members are provided in association with the demodulation circuit section 11. May be In addition, such a shield member is especially necessary,
Only the circuit part that is easily affected by external noise,
Therefore, only the shield member 43 may be provided and the shield member 44 may be omitted.

FIG. 5 shows another embodiment of the present invention. In this embodiment, the connector case portion 48 is sandwiched between the two free ends 47 a and 47 b of the frame 47, and they are fixed by the screw 49.

FIG. 6 shows still another embodiment of the present invention. In this embodiment, the frame 50 is formed by bending a metal plate having a U-shaped cross section. On the other hand, the connector case portion 51 includes a connecting portion 5
2 and 53 are formed, and these connecting portions 52 and 53 are formed.
Are received in the U-shaped section of the two free ends 50a and 50b of the frame 50. These free ends 50
a and 50b, and the connecting portions 52 and 53,
Screw-fastening holes 54, 55, 56, 57 are provided, respectively, and the connector case portion 51 is made into the frame 50 by screws (not shown) passing through the screw-fastening holes 54 and 56 and the screw-fastening holes 55 and 57 respectively. Fixed against.

FIG. 7 shows still another embodiment of the present invention. The frame 58 shown in FIG. 7 is manufactured by molding a metal plate. In the frame 58,
At its periphery, similar to the frame 50 shown in FIG. 6, it is provided with a U-shaped cross section, whose two free ends 58a
And 58b are provided with screwing holes 59 and 60 for screwing a connector case portion (not shown).

The frame 58 is further integrally formed with a top wall 61, which allows adjustment of electronic components disposed on the printed circuit board and / or such. In order to prevent the height of the electronic components from interfering with the top wall 61, a plurality of windows 62, 63, 64 are provided.
And holes 65 and 66 are provided. In addition, by utilizing a part of the metal plate forming the upper surface wall 61, the shield plate 6
7 is formed.

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

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing main elements constituting a card type electronic tuner 1 according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an external appearance of the card-type electronic tuner 1 shown in FIG. 1 after being assembled.

3 is an enlarged sectional view taken along line III-III in FIG.

FIG. 4 is a block diagram showing an electric circuit configured on the printed circuit board 6 shown in FIG.

FIG. 5 is a frame 47 included in another embodiment of the present invention.
7 is a perspective view showing a connector case portion 48. FIG.

FIG. 6 is a perspective view showing a frame 50 and a connector case portion 51 included in still another embodiment of the present invention.

FIG. 7 is a perspective view showing a frame 58 included in still another embodiment of the present invention.

[Explanation of symbols]

1 Card Type Electronic Tuner 2 Case 3, 47, 50, 58 Frame 3a, 3b, 47a, 47b, 50a, 50b, 58
a, 58b Free end 4, 48, 51 Connector case part 5 Cover 6 Printed circuit board 7 Electronic component 8 Connector 9 Tuner circuit part 10 Channel control circuit part 11 Demodulation circuit part 12 VHF circuit part 13 UHF circuit part

Claims (1)

[Claims] 1. A card-type case, a circuit board that houses a tuner circuit section, a channel control circuit section, and a demodulation circuit section that is housed in the case, and is electrically connected to the circuit board. Case 1
A connector disposed along one side, the case includes a frame made of a metal that surrounds the three sides of the circuit board in a U shape, and the connector that connects between two free ends of the frame. A card-type electronic tuner having a connector case portion for positioning the.