JPH05122089A - Card type electronic tuner - Google Patents

Abstract

PURPOSE:To obtain an exterior electronic tuner mounted on a main body capable of reception only in the case of desiring the reception of the video and the sound of TV in a device such as personal computer or a home video camera, which constantly does not need a tuner. CONSTITUTION:In a card type case 2, a printed circuit board 6 constituting a tuner circuit part, a channel control circuit part and a demodulating circuit part is incorporated and a connector 8 inputting/outputting a signal to the printed circuit board is arranged along one of the side of the case 2. Electrical conductivity is given to the surface of a frame 3 provide on the case 2 by plating, etc., and a protrusion provided on the frame 3 electrically touches a top cover 4, a bottom cover 5 and the printed circuit board 6 to give them a satisfactory shielding efficiency. The card type electronic tuner obtained by it can be handled like 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 above case is a frame made of resin,
An upper cover made of a conductive material that closes the upper opening of the frame and a lower cover made of a conductive material that closes the lower opening of the frame are provided. Further, the frame is provided with a partition wall that crosses the main surface of the circuit board. Further, at least a part of the frame is provided with electrical conductivity at least on its surface, and the surface provided with the electrical conductivity is provided with projections respectively contacting the upper cover, the lower cover and the circuit board. .

[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. ..

Further, the conductivity given to the frame is caused by, for example, unnecessary electromagnetic interference between each of the tuner circuit section, the channel control circuit section and the demodulation circuit section formed on the circuit board, and from the outside. It not only acts as a shield that blocks signal spills and signal radiation from the inside, but also acts as a ground connection for the frame to the upper and lower covers and the circuit board, maintaining the overall performance of the tuner in a stable manner. There is. The protrusions on the electrically conductive surface of the frame allow the frame to make reliable electrical contact with the top and bottom covers and the circuit board.

[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, according to the present invention, the conductivity imparted to the frame can provide a necessary shielding effect, and the surface of the frame to which the conductivity is imparted is surely projected by the upper cover and the lower cover. In addition, since it is in electrical contact with the circuit board, a reliable and stable grounding effect can be obtained. Therefore, the performance of the entire tuner can be stably maintained. Further, since at least a part of the shield plate separately provided can be omitted, the cost burden related to the shield plate can be reduced.

[0015]

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. Case 2 is frame 3, frame 3
And 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. 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. For such a frame 3, metal plating, conductive coating, or the like is applied to necessary portions 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, for example, 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. To fix the upper cover 4 and the lower cover 5 to the frame 3, for example,
A double-sided adhesive sheet, screwing, snapping, adhesion, welding, etc. are used.

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 above-mentioned printed circuit board 6, 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.

FIG. 4 is a perspective view showing the frame 3 alone. In FIG. 4, the frame 3 is shown with the surface on which the lower cover 5 is attached facing upward.

Referring to FIG. 4, the frame 3 has a partition wall 44 provided so as to cross the main surface of the printed circuit board 6,
45 and 46 are provided. These partition walls 44, 45, 46
By the above-mentioned first, second and third regions 40,
Compartments for 41, 42 are provided. The partition walls 44 and 45 are provided with fitting protrusions 47, 48 and 49 that are received by the printed circuit board 6.

Further, in the frame 3 shown in FIG. 4, a step portion 50 into which the lower cover 5 is fitted and a concave portion 51 to position the connector 8 are shown. Further, each of the partition walls 44 and 45 is provided with a plurality of protrusions 52 distributed at a plurality of locations.

In the frame 3, as described above,
Metal plating or conductive coating is applied to give conductivity to the surface. The conductivity may be given to a part of the surface of the frame 3 in consideration of the shielding property. The conductivity may be given only to the surface of the frame 3, or may be given in the thickness direction by the frame 3 itself being made of a conductive material.

A part of the frame 3 thus provided with conductivity at least on its surface is shown in FIGS. In addition, although the partition wall 53 provided in the frame 3 is shown in these drawings, the partition wall 53 is not a specific one such as the partition walls 44 to 46 described above but is generalized.

As shown in FIGS. 5 and 6, projections 54 are provided on the upper surface of the partition wall 53, and projections 55 and 56 corresponding to the above-mentioned projections 52 are also provided on the lower surface. The projection 55 provided on the lower surface of the partition wall 53 is located on the fitting protrusion 57 corresponding to the fitting protrusions 47 to 49 described above. Further, slight recesses 58 and 59 are provided at the portions where the protrusions 54 and 56 are located, respectively.

The printed circuit board 6 is provided with a slit 60 for receiving the above-mentioned fitting convex portion 57. Also,
The upper cover 4 and the lower cover 5 have a double-sided adhesive sheet 61.
And 62 are in a stuck state.

As shown in FIG. 2, when the card type electronic tuner 1 is assembled, the upper cover 4 and the lower cover 5 are fixed to the frame 3 in which the printed circuit board 6 is incorporated. In such an assembling process, FIG.
The upper cover 4 and the lower cover 5 are pressed toward the partition wall 53 as shown by arrows 63 and 64, respectively, in the positional relationship shown in FIG. When the card type electronic tuner 1 is assembled, as shown in FIG. 7, the upper cover 4 is attached to the upper surface of the partition wall 53 via the double-sided adhesive sheet 61, while the lower cover 5 is interposed via the double-sided adhesive sheet 62. And is attached to the lower surface of the printed circuit board 6. Accordingly, the protrusion 54 electrically contacts the upper cover 4, the protrusion 55 electrically contacts the lower cover 5, and the protrusion 56 electrically contacts an earth land (not shown) on the printed circuit board 6. To do. Since each of the protrusions 54 to 56 has a conical shape, as shown in the enlarged view of the protrusion 54 in FIG. 8, the tip portion thereof is crushed and a more reliable electrical contact state can be achieved. it can.

The shapes of the projections 54 to 56 are not limited to the conical shape, and may be any shape as long as they can stably contact the surface to be contacted.

9 and 10 show a generalized partition wall used in another embodiment of the present invention.

In the partition wall 65 shown here, the projection 6
6, 67, 68 are provided on arms 69, 70, 71 extending from the partition wall 65, respectively. Arms 69-71
Is formed of resin integrally with the partition wall 65.

According to this embodiment, the protrusions 66 to 68 are
Since it is located on the arms 69 to 71, the arm 69
Due to the elasticity of ~ 71, the protrusions 66 to 68 can be stably brought into contact with the upper cover, the lower cover and the printed circuit board, respectively.

In each of the above-mentioned embodiments, the projections 54-
56 and 66-68 were provided in the bulkheads 53 and 65, but such protrusions are provided in the frame 3 as needed.
May be provided on the outer peripheral portion of the. In FIG. 9 and FIG. 10, the arms 6 are arranged so as to project to both sides of the partition wall 65.
Although 9 to 71 are provided, when such an arm is provided on the outer peripheral portion of the frame 3, the arm is provided so as to project only inside the outer peripheral portion of the frame 3.

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 frame 3 shown in FIG. 1 alone, and is shown in a posture upside down from the posture shown in FIG.

5 is a front view showing a part of a partition wall 53 provided on the frame 3, and is also shown in a state where an upper cover 4, a lower cover 5 and a printed circuit board 6 are separated from each other. FIG.

6 is a plan view showing a part of a partition wall 53 shown in FIG.

FIG. 7 is a front view showing a state where the elements shown in FIG. 5 are combined.

8 is an enlarged view of a portion VIII in FIG.

9 is a plan view showing another example of the partition wall 65 provided on the frame 3. FIG.

10 is a front view of the partition wall 65 shown in FIG.

[Explanation of symbols]

 1 Card Type Electronic Tuner 2 Case 3 Frame 4 Upper Cover 5 Lower Cover 6 Printed Circuit Board 7 Electronic Components 8 Connector 9 Tuner Circuit Section 10 Channel Control Circuit Section 11 Demodulation Circuit Section 12 VHF Circuit Section 13 UHF Circuit Section 44-46, 53 , 65 Partition walls 52, 54-56, 66-68 Protrusions

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
And a connector arranged along one side, wherein the case is made of a frame made of resin, an upper cover made of a conductive material closing an upper opening of the frame, and a conductive material closing a lower opening of the frame. A lower cover is provided, the frame is provided with a partition wall that crosses the main surface of the circuit board, and at least a part of the frame is provided with conductivity at least on its surface, and the surface provided with this conductivity. The card-type electronic tuner is provided with a protrusion that comes into contact with the upper cover, the lower cover, and the circuit board.