JPH05110458A - Card type electronic tuner - Google Patents

Abstract

PURPOSE:To obtain the externally adaptably electronic tuner to be mounted to a main body to receive a television video and audio signal in the device such as a personal computer or an 8mm video camera not requiring the tuner at all times. CONSTITUTION:A printed circuit board 6 forming a tuner circuit section, a channel control circuit section and a demodulation circuit section is built in a card type case 2 and a connector 8 inputting and outputting a signal to/from the printed circuit board 6 is arranged along one side of the case 2. An upper cover 4 provided to the case 2 is fixed to a frame 3 by engaging with engagement walls 47, 48 of engagement pieces 45, 46 together with a double side adhesion sheet, an adhesive. Thus, the card type electronic tuner obtained in this way is provided with a case with high reliability and handled similarly to a conventional IC memory card.

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.

The case described above includes a frame having at least one opening extending in the direction of the main surface thereof and a cover closing the opening. This cover is joined to the frame by a double-sided pressure-sensitive adhesive sheet, a pressure-sensitive adhesive or an adhesive, and is also engaged by mechanical engagement means.

[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. ..

A circuit board is housed inside the case,
After the necessary adjustments are completed, the opening of the frame provided in the case is closed by the cover. The cover is fixed to the frame by using an adhesive or an adhesive together with a mechanical engaging means.

[0012]

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, as described above, the cover is fixed to the frame by the combined use of the adhesive or the adhesive and the mechanical engaging means, so that the adhesive or the adhesive alone joins with the passage of time. The problem of the parts being deteriorated and peeling off is solved by the engagement by the mechanical engaging means, while the problem of rattling of the cover with respect to the frame by the mechanical engaging means alone is solved by the adhesive or the adhesive. Can be solved by.

It is to be noted that, for example, screwing is conceivable in order to securely fix the cover to the frame. However, such screwing may impair the aesthetics of the case, and an extremely thin card of this type. It may not be applicable to type cases. Further, in such a thin case, it is not possible to secure the fixing of the cover to the frame by applying only one of the joining by the adhesive or the adhesive or the engagement by the mechanical engaging means. Often difficult. Therefore, if the adhesive or the adhesive and the mechanical engagement means are used together as in the present invention, the defects of each other can be compensated and the cover can be securely fixed to the frame.

[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 2
FIG. 2 is an enlarged sectional view taken along the line II-II in FIG. 1. Figure 3
FIG. 2 is a block diagram showing an electric circuit provided in the card type electronic tuner 1.

The card type electronic tuner 1 includes a card type case 2. The case 2 includes a frame 3 having an upper surface opening and a lower surface opening extending in the main surface direction of the case 2, an upper cover 4 closing the upper surface opening of the frame 3, and a lower cover 5 closing the lower surface opening of the frame 3. Such a case 2 is preferably sized substantially the same as a general-purpose IC memory card.

The frame 3 is formed of a molded product made of a synthetic resin having an increased rigidity such as glass fiber reinforced polyphenylene sulfide, polyethylene terephthalate, and polycarbonate. Such a frame 3 may be subjected to metal plating, conductive coating, or the like at a necessary portion for the purpose of improving the shield property.

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.

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 a material such as ceramic, or may have a multilayer structure. Further, each outer surface of the lower cover 5 and the upper cover 4 can be appropriately used as a surface for printing or the like.

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 positioned in the case 2 mainly by the frame 3.

As represented by the electronic component 7 shown in FIG. 2, 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. 3, 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 section 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, on the printed circuit board 6 described above, 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.
The first area 40 and the second area 4 sectioned by the broken line in FIG.
It is arranged in the first and third regions 42. First area 40
VHF circuit section 12 included in the tuner circuit section 9
The positional relationship between the UHF circuit unit 13 and the UHF circuit unit 13 can be arbitrarily changed. In the case 2, a shield plate that separates the tuner circuit unit 9, the channel control circuit unit 10, and the demodulation circuit unit 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 earth land on the printed circuit board 6,
The overall shielding performance is ensured.

A shield plate 43, which is one of the shield plates described above, is shown in FIG. This shield plate 43 is
The frame 3 is attached along a partition wall 44 provided so as to cross the main surface of the printed circuit board 6.

In this card type electronic tuner 1, the surface on which the upper cover 4 is provided has a character as a cosmetic surface, and an aesthetic appearance is required. For this reason, when fixing the upper cover 4 to the frame 3, it is not possible to employ any means that impairs the appearance. On the other hand, the lower cover 5
On the side where is attached, aesthetics are not required so much. Therefore, since the lower cover 5 is fixed to the frame 3, in addition to adhesion, adhesion, welding, etc., it is a reliable fixing means.
Screwing, which is one of them, can be adopted without any problem.

From such a background, in this embodiment, ingenuity is particularly made in fixing the upper cover 4.

FIG. 4 is a perspective view showing the upper cover 4 alone. For example, two engaging pieces 45 and 46 are provided on each of two opposite sides of the upper cover 4. On the other hand, as shown in FIG. 2, the frame 3 is mechanically engaged with each of the engaging pieces 45 and 46 while being positioned inside the case 1. Engagement walls 47 and 48 are provided. In FIG. 5 and FIG. 6, a portion where one engagement piece 46 engages with the frame 3 is shown in an enlarged manner. Further, FIG. 7 shows a portion of the frame 3 shown in FIG. 6 before the upper cover 4 is attached.

As shown in FIGS. 5 to 7, the frame 3 is provided with a recess 49 below the engagement wall 48. The bottom surface of the recess 49 is closed by the lower cover 5.

When incorporating the upper cover 4 into the frame 3, first, for example, a double-sided adhesive sheet is attached to the lower surface of the upper cover 4. Then, one of the engagement pieces 45 and 46 of the upper cover 4 is connected to the corresponding engagement wall 47 or 48.
Then, the other of the engagement pieces 45 and 46 is engaged with the corresponding engagement wall 47 or 48 while the upper cover 4 is curved. Then, the upper cover 4
If the upper cover 4 is pressed against the frame 3 so as to be flat, the upper cover 4 is joined to the frame by the double-sided adhesive sheet.

Instead of the double-sided pressure-sensitive adhesive sheet described above, a pressure-sensitive adhesive may be directly applied to the lower surface of the upper cover 4, or an adhesive may be used instead of the pressure-sensitive adhesive.

Further, the engaging piece 45 provided on the upper cover 4
The number and position of and 46 are arbitrary.

The structure adopted for the upper cover 4 described above may be adopted for the lower cover 5 side.

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

[Brief description of 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 cross-sectional view taken along the 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.

FIG. 4 is a perspective view showing the upper cover 4 shown in FIGS. 1 and 2 alone.

5 is an engagement piece 46 and an engagement wall 48 at the right end of FIG.
It is an expanded sectional view which shows the engaging part with.

FIG. 6 is a plan view showing a right end portion of FIG.

7 is a plan view showing a state in which an upper cover 4 is removed from the frame 3 shown in FIG.

[Explanation of symbols]

 1 Card Type Electronic Tuner 2 Case 3 Frame 4 Upper Cover 6 Printed Circuit Board 7 Electronic Component 8 Connector 9 Tuner Circuit Section 10 Channel Control Circuit Section 11 Demodulation Circuit Section 12 VHF Circuit Section 13 UHF Circuit Section 45, 46 Engagement Piece 47, 48 engagement wall

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 having at least one opening extending in a main surface direction thereof, and a cover closing the opening, and the cover has a double-sided surface with respect to the frame. A card type electronic tuner which is joined by a pressure sensitive adhesive sheet, a pressure sensitive adhesive or an adhesive, and is engaged by a mechanical engaging means.