JP3254723B2 - Card type high frequency equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[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]

As devices having a video display function which are generally used at present, in addition to the above-described television receiver, for example, video devices such as personal computers having a display, information devices and the like are available. is there. Naturally, these video or information devices do not have a built-in tuner, so 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.

[0006] The same is true for other high frequency equipment such as, for example, RF modulators. That is,
For example, when an image recorded by a video camera is to be reproduced on a separate monitor device or displayed in real time, the video camera and the monitor device are usually connected with an RF modulator interposed. Is being done. Regarding the use state of such an RF modulator, for example, if an RF modulator having a transmission function is built in a video camera, the above-described connection between the video camera and the monitor device becomes unnecessary. However, it is not preferable that the video camera has a built-in RF modulator because the portability of the video camera is reduced. Therefore, it is desired that the RF modulator can be attached to a video camera as needed.

It is, therefore, an object of the present invention to provide a high-frequency device such as an electronic tuner or an RF modulator having a form suitable for mounting on a desired device as required.

[0008]

According to the present invention, a card-type high-frequency device is provided to solve the above technical problems.

This card type high frequency device is a card type case, a circuit board housed in the case, electrically connected to the circuit board, and arranged along one side of the case. A connector.

The above-mentioned case comprises a frame for positioning the periphery of the circuit board, an upper cover made of a conductive material for closing the upper opening of the frame, and a lower cover made of a conductive material for closing the lower opening of the frame. Prepare.

A shield plate made of a metal plate is disposed between the frame and the lower cover. The shield plate is provided with a rising shield wall, and at the upper end of the shield wall, a contact piece that penetrates the frame is provided.
It is bent on the upper surface of the frame and electrically contacts the lower surface of the upper cover.

[0012]

According to such a card-type high-frequency device, for example, a circuit necessary for a desired high-frequency device such as an electronic tuner or an RF modulator and a necessary peripheral circuit not provided in a video device or an information device to which the device is mounted are provided. , Can be stored in a card-type case. Input and output of signals can be performed through a connector.

[0013]

Thus, according to the present invention, a card-type high-frequency device such as an IC memory card can be obtained as a whole. Such a card-type high-frequency device is easy to store and carry, and is suitable for handling as an optional accessory for various video devices 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.

In order for the card-type high-frequency device according to the present invention to be mountable on a video device or an information device, the main body of such a device is provided with, for example, a slot in which the card-type high-frequency device can be mounted. In connection with this slot, a connector paired with a connector provided in the card-type high-frequency device 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.

In the card-type high-frequency device according to the present invention, sufficient consideration is given to the shielding property. In other words, the upper and lower covers made of a conductive material and the shield plate made of a metal plate having a shield wall can provide sufficient shielding properties. For this reason, it is possible to prevent inconveniences such as radio interference and reception interference from occurring in such high-frequency devices.

The rigidity of the card-type high-frequency device can be increased not only by the frame but also by a shield plate having a shield wall. Therefore, according to the present invention, it is possible to provide sufficient rigidity to a card-type high-frequency device, which tends to have insufficient rigidity against bending due to its small thickness. Therefore, if the card-type high-frequency device is undesirably bent, the components included therein may be damaged or, for example, a gap may be formed between the upper cover or the lower cover and the frame. It is possible to prevent the deterioration and the intrusion of foreign matter to cause a functional failure. As a result, the reliability of the card-type high-frequency device can be improved.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to an electronic tuner will be described below.

FIG. 2 is a perspective view showing an appearance of a card-type electronic tuner 1 according to an embodiment of the present invention. FIG.
FIG. 3 is an exploded perspective view showing elements included in the card-type electronic tuner 1 shown in FIG. 2.

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 article made of a synthetic resin having increased rigidity, such as polyphenylene sulfide, polyethylene terephthalate, or 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. The outer surfaces of the upper cover 4 and the lower cover 5 can be appropriately used as surfaces for printing or the like.

In such a case 2, a circuit board is housed. The circuit board comprises a printed circuit board 6 in this embodiment. A shield plate 43 made of a metal plate is arranged between the frame 3 and the lower cover 5.
FIG. 1 shows only the contact piece 44 which is a part of the shield plate 43. FIG. 3 shows the frame 3, the printed circuit board 6, and the shield plate 43 separated from each other.

As the printed circuit board 6, for example, a double-sided wiring type made of a 0.5 mm thick glass epoxy board is used. On the upper surface of the printed circuit board 6, required electronic components 7 and connectors 8 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
, Except for the ground connection with the shield plate 43,
It is covered with an insulating film (not shown).

The printed circuit board 6 may be made of a ceramic material, for example, or may have a multilayer structure.

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

The periphery of the printed circuit board 6 on which the required electronic components 7 and connectors 8 are mounted is positioned mainly in the case 2 by the frame 3. Further, in this embodiment, as shown in FIG. 1, the positioning of the printed circuit board 6 is further ensured by the shield plate 43.

As shown in FIG. 3, the shield plate 43 is obtained by sheet metal working a single metal plate. The shield plate 43 includes a shield wall 45 that rises around the periphery thereof and a plurality of shield walls 46 that rise up at the center of the main surface. The above-mentioned contact piece 44 is provided at each upper end of the shield walls 45 and 46. Also, along one edge of the shield plate 43,
The projection 47 is formed. The protrusion 47 functions to contact and support the lower surface of the connector 8. A plurality of screw holes 48 are provided in the main surface of the shield plate 43.

The printed circuit board 6 has a plurality of slots 49 for receiving and penetrating the shield wall 46 described above.
Is provided. The printed circuit board 6 is provided with screw holes 50 at positions corresponding to the screw holes 48 described above. The printed circuit board 6 is located inside the shield wall 45 when combined with the shield plate 43.

The frame 3 has a U-shaped outer peripheral wall 51 for surrounding the shield wall 45. Outer wall 51
A concave portion 52 for receiving the connector 8 is formed on the open end side of the connector. A reinforcing bone 53 is provided in a region surrounded by the outer peripheral wall 51. In addition, a plurality of slots 54 through which the above-mentioned contact piece 44 penetrates are provided in such a frame 3.
Is provided. Further, a concave portion 55 for absorbing the thickness of the upper cover 4 shown in FIG.

The frame 3, the printed circuit board 6, and the shield plate 43 are overlaid in a positional relationship as shown in FIG. In this state, the shield wall 45 is located between the outer periphery of the printed circuit board 6 and the outer peripheral wall 51 of the frame 3, and the shield wall 46 passes through the slot 49 of the printed circuit board 6. Furthermore, the contact piece 44 passes through the slot 54 of the frame 3. These contact pieces 44 are bent on the upper surface of the frame 3 as shown in FIG. In this state, screws (not shown) are inserted into the screw holes 48 and 50 from below the shield plate 43 and screwed into the frame 3, and these frames 3, the printed circuit board 6 and the shield plate 43 are mechanically connected. Be integrated.

Next, the upper cover 4 is attached to the frame 3 and
The lower cover 5 is fixed to the shield plate 43 with an adhesive or an adhesive, respectively. At this time, in the upper cover 4 shown in FIG. 1, no adhesive or pressure-sensitive adhesive is applied to the area 56 shown by the broken line. These regions 56 are located corresponding to the contact pieces 44, so that the contact pieces 44 make electrical contact with the lower surface of the upper cover 4. Further, the lower cover 5 covers the opening formed in the shield plate 43 as a result of the formation of the shield wall 46 and the connecting piece 44 connected thereto, thereby preventing the deterioration of the shield property and improving the appearance. Fulfill.

Although not shown, it is preferable that a concave portion for absorbing the thickness of the contact piece 44 is provided on the upper surface of the frame 3 and below each of the bent contact pieces 44. Thereby, the adhesion of the upper cover 4 to the frame 3 can be improved.

As described above, the card-type electronic tuner 1 having the appearance as shown in FIG. 2 is obtained.

In FIG. 3, on a printed circuit board 6, some electronic components 7 are typically shown.
Various circuits are configured on such a printed circuit board 6. The circuit configured on the printed circuit board 6 is shown in FIG.

Referring to FIG. 4, the circuit formed on printed circuit board 6 is roughly divided into tuner circuit section 9, channel control circuit section 10, and 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 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 38 , and a ground terminal 39 are formed.

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

The above-described tuner circuit section 9, channel control circuit section 10 and demodulation circuit section 11 are respectively arranged in separate areas of the printed circuit board 6. The shield wall 46 of the shield plate 43 shown in FIG. 3 is located so as to separate the respective areas of the tuner circuit section 9, the channel control circuit section 10 and the demodulation circuit section 11 from each other, and electromagnetic interference between them. Has been tried to prevent. The shield plate 43 is electrically connected to an earth land on the printed circuit board 6.

FIGS. 5 to 7 show another embodiment of the present invention. The contact piece 44 formed on the shield plate includes:
As shown in FIG. 5, notches 57 are formed on both sides, and an engagement hole 58 is formed at the center in the width direction. On the other hand, as shown in FIGS. 6 and 7, near the slot 54 provided in the frame 3, an engagement protrusion 59 is provided.
Is provided.

According to this embodiment, the presence of the notch 57 makes it easy for the contact piece 44 to be bent at a predetermined position, and allows the engaging projection 59 to engage with the engaging hole 58. Thus, the shield plate 43 can be positioned more reliably with respect to the frame 3.

A recess 60 is formed on the upper surface of the frame 3 below the bent contact piece 44. The recess 60 is, as best shown in FIG.
By absorbing the thickness of the contact piece 44, the contact piece 44 can reliably contact the lower surface of the upper cover 4 in a resilient state in a state where the upper cover 4 is fixed to the frame 3.

In the above-described embodiment, the notch 57 is provided in order to make it easy for the contact piece 44 to be bent at a predetermined position. Alternatively, a notch may be formed.

FIG. 8 is a sectional view corresponding to FIG. 7 showing still another embodiment of the present invention. 8, elements corresponding to the elements shown in FIG. 7 are denoted by the same reference numerals,
Duplicate description will be omitted.

In FIG. 8, the top of the engagement projection 59 is melted and crushed to make the engagement with the engagement hole 58 more dense. In addition, a contact protrusion 61 is formed at the tip of the contact piece 44, and this is configured to contact the lower surface of the upper cover 4.

Although not shown in the embodiment relating to the card-type electronic tuner 1 described above, a receiving antenna may be externally or internally provided in such a card-type electronic tuner 1.

The present invention is not limited to electronic tuners, but can be applied to other high-frequency devices such as RF modulators.

[Brief description of the drawings]

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

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

FIG. 3 shows a frame 3 and a printed circuit board 6 shown in FIG.
FIG. 4 is a perspective view showing the shield plate 43 in an exploded state.

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

FIG. 5 is a front view showing a contact piece 44 included in another embodiment of the present invention.

FIG. 6 is a perspective view showing a bent state of the contact piece 44 shown in FIG. 5;

FIG. 7 is a sectional view taken along line VII-VII in FIG. 6;

FIG. 8 is a view corresponding to FIG. 7, showing still another embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Card-type electronic tuner (card-type high-frequency device) 2 Case 3 Frame 4 Upper cover 5 Lower cover 6 Printed circuit board 7 Electronic component 8 Connector 9 Tuner circuit unit 10 Channel control circuit unit 11 Demodulation circuit unit 12 VHF circuit unit 13 UHF circuit Part 43 shield plate 44 contact piece 45,46 shield wall 49,54 slot

Continuation of the front page (56) References JP-A-57-198588 (JP, A) JP-A 64-37087 (JP, U) JP-A-59-121703 (JP, U) JP-A 1-129898 (JP) , U) Japanese Utility Model Application Showa 60-82849 (JP, U) Table 2-2-1650 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04B 1/08

Claims (1)

(57) [Claims] 1. A card-shaped case, a circuit board housed in the case, and one of the cases electrically connected to the circuit board.
A connector arranged along two sides, the case includes a frame for positioning the periphery of the circuit board, an upper cover made of a conductive material for closing an upper surface opening of the frame, and a lower surface opening of the frame. A lower cover made of a conductive material to be closed, a shield plate made of a metal plate is disposed between the frame and the lower cover, and the shield plate is provided with a rising shield wall;
At the upper end of the shield wall, a contact piece penetrating the frame is provided, and the contact piece is bent on an upper surface of the frame and is in electrical contact with a lower surface of the upper cover. High frequency equipment.