JP3134419B2 - 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 arranged along one side of the case.

Further, the above-mentioned case has a frame for positioning the circuit board. Further, the above-described connector conductor is electrically connected to the circuit board and is mechanically held, and has a distal end located at a predetermined gap from the circuit board. The frame is provided with a through-hole for receiving the distal end portions of these connector conductors.
It is Ru tapered surface provided for guiding the connector conductors.

[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.

Further, since the connector conductor is electrically connected to the circuit board and is mechanically held, the reliability of the electrical connection is high, and the work of assembling the connector conductor into the frame is facilitated. Further, the connector conductor can be easily mounted by an automatic machine similarly to other electronic components mounted on the circuit board, and can be soldered simultaneously with the other electronic components, for example, by a reflow method.

Further, since the distal end of the connector conductor is located at a predetermined gap from the circuit board, it does not hinder the positioning of the circuit board by the frame.

[0015]

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.

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 polyphenylene sulfide, polyethylene terephthalate, and polycarbonate reinforced with glass fibers. 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 (not shown) 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. Printed circuit board 6
Is covered with an insulating film (not shown).

The material of the printed circuit board 6 may be ceramic, 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.

The printed circuit board 6 on which required electronic components 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. FIG. 2 shows a double-sided adhesive sheet 7 for fixing the lower cover 5 to the frame 3 and the printed circuit board 6.

The circuit formed on the printed circuit board 6 is shown in FIG. Referring to FIG. 5, circuits formed on printed circuit board 6 are roughly classified into a tuner circuit section 9, a channel control circuit section 10, and a demodulation circuit section 1.
1 is provided. The tuner circuit section 9 includes a VHF circuit section 12 and a UHF circuit section 13.

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 includes a channel control circuit 22, and an 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 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 (not shown) that divides 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 includes an upper cover 4 and a lower cover 5,
In addition, it is electrically connected to an earth land on the printed circuit board 6 so that the entire shielding performance is ensured.

A plurality of connector conductors 8 are arranged, for example, along the short side of case 2. These connector conductors 8
Are electrically connected to predetermined conductive lands on the printed circuit board 6, thereby connecting the terminals 14, 3 shown in FIG.
An electrically conductive state with 1 to 39 is achieved.

FIG. 3 shows a portion of the printed circuit board 6 to which the connector conductor 8 is attached, and FIG. 4 shows a portion of the frame 3 for receiving the connector conductor 8.

Referring to FIGS. 2 to 4, connector conductor 8 is electrically connected to a predetermined conductive land on printed circuit board 6 via solder 43, and at the same time, is mechanically connected to printed circuit board 6. Will be retained. The solder 43 may be replaced with a conductive adhesive. The connector conductor 8
For example, it is obtained by punching a metal plate. The connector conductor 8 has a distal end 44 located at a predetermined gap from the printed circuit board 6.

The frame 3 is provided with a through hole 45 for receiving the distal end portion 44 of the connector conductor 8. Through hole 45
Is formed with a tapered surface 46 to facilitate receiving of the distal end 44.

The connector conductor 8 held on the printed circuit board 6 follows the path indicated by the arrow 47 in FIG. After this insertion, as shown in FIG.
The tip portion 44 is substantially exactly fitted in the through hole 45.

FIGS. 6 and 7 show another embodiment of the present invention. The connector conductor 8a shown in FIG. 6 is manufactured by a method such as cutting or forging, and has a circular cross section. Its tip 44a is relatively thin.

The connector conductor 8b shown in FIG. 7 is obtained by punching a metal plate and then forming it appropriately. The tip portion 44b has a substantially circular cross section by crushing a corner portion.

In FIGS. 6 and 7, elements corresponding to those shown in FIG. 3 described above are denoted by the same reference numerals, and redundant description will be omitted. These connector conductors 8
a and 8b are electrically connected to the circuit board 6 and are mechanically held in the same manner as the connector conductor 8 described above, and the tip portions 44a and 44b are located at a predetermined gap from the circuit board 6. are doing.

It should be noted that such connector conductors 8, 8a,
8b is made of, for example, a copper-based material, and may be plated as necessary.

Although the connector conductors 8, 8a and 8b are all in the form of pins, they may be in the form of a socket for receiving a connector conductor paired with such a connector conductor.

Although the illustrated embodiment does not include a receiving antenna, such a receiving antenna may be externally or internally provided in 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.

3A is a diagram corresponding to FIG. 2 and shows a configuration on the printed circuit board 6 side, and FIG. 3B is a line 3B-3B in FIG.
FIG.

FIG. 4 is a view corresponding to FIG. 2 showing a frame 3 shown in FIG. 2;

FIG. 5 is a block diagram showing an electric circuit formed on the printed circuit board 6.

6A and 6B show another embodiment of the present invention, and FIG.
It is a figure corresponding to (a), (b) is a line 6B-6 of (a).
It is sectional drawing which follows B.

7A and 7B show still another embodiment of the present invention, wherein FIG. 7A is a diagram corresponding to FIG. 3A, and FIG. 7B is a diagram corresponding to line 7B of FIG.
It is sectional drawing in alignment with -7B.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Card-type electronic tuner 2 Case 3 Frame 6 Printed circuit board 8, 8a, 8b Connector conductor 9 Tuner circuit section 10 Channel control circuit section 11 Demodulation circuit section 12 VHF circuit section 13 UHF circuit section 43 Solder 44, 44a, 44b Tip 45 Through hole

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-198588 (JP, A) JP-A-60-70679 (JP, A) JP-A 63-1774734 (JP, U) JP-A-2- 60347 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) H04B 1/08 H04B 1/16 H05K 5/02

Claims (1)

(57) [Claims] 1. A card type case, a circuit board housed in the case, the tuner circuit portion, the channel control circuit portion, and the demodulation circuit portion, and are arranged along one side of the case. A plurality of connector conductors, the case includes a frame for positioning the circuit board, and the connector conductor is electrically connected to the circuit board and mechanically held, and The frame has a leading end located at a predetermined gap, the frame is provided with a through hole for receiving the leading end of the connector conductor, and the through hole is provided with a tapered surface for guiding the connector conductor.
Kettled , card-type electronic tuner.