JPH06188755A - Card type high frequency equipment - Google Patents

Abstract

PURPOSE:To obtain a card type electronic tuner that is mounted on the main body of equipment such as a personal computer, which does not require a tuner at all times, similarly to an IC memory card and receives a video and audio of television only when necessary. CONSTITUTION:A printed circuit board 6 which constitutes a circuit necessary for the tuner is incorporated in a card type case and a connector for inputting and outputting signals to and from the printed circuit board 6 is arranged along one side of the case. The case is provided a frame, and an upper and a lower cover; and a cover internal surface material 43 which constitutes part of the lower cover 5, a conductor layer 58 as the earth land of the printed circuit board 6, and a plating layer 61 are fixed with a conductive adhesive 62.

Description

Detailed Description of the Invention

[0001]

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

[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]

At present, as a device having a video display function which is generally used, in addition to the above-mentioned television receiver, for example, a video device such as a personal computer having a display, an information device, and the like. is there. As a matter of course, since a tuner is not built in these video equipment or information equipment, it is impossible to receive the television broadcast and output the 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 needed, the applications of these equipment can be expanded, and as a result, the commercial value can be increased. it can.

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

[0007] Therefore, it is 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 needed.

[0008]

In order to solve the above-mentioned technical problems, the present invention provides a card type high frequency device.

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

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

Further, an earth land is formed on the surface of the circuit board facing the lower cover, and the surface of the lower cover facing the earth land and the earth land are fixed to each other by a conductive adhesive.

[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 high frequency device is mounted are provided. , It can be stored in a card type case. Input / output of signals can be performed via the connector.

[0013]

Therefore, according to the present invention, a high-frequency device, such as an IC memory card, which has a card type as a whole can be obtained. 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. Therefore, unlike the function as a television receiver in a video equipment or an information equipment, it is not necessary to store a function which is not always used in the main body of these equipments. Therefore, it is possible to increase the size and weight of such equipments. It can be prevented.

In order to mount the card type high frequency equipment according to the present invention on a video equipment or an information equipment, a main body of such equipment is provided with a slot for mounting the card type high frequency equipment, for example. In connection with this slot, a connector paired with the connector provided in the card type high frequency device may 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.

In the card type high frequency equipment according to the present invention, sufficient consideration is given to the shielding property. That is, first, the upper cover and the lower cover made of a conductive material are provided, and the lower cover is electrically connected to the earth land of the circuit board through the conductive adhesive, and as a result, a sufficient shield is provided. Can give sex. Therefore, it is possible to prevent inconveniences such as radio interference and reception interference from occurring in such high-frequency equipment.

The above-mentioned conductive adhesive makes it possible to reliably electrically connect the earth land and the lower cover regardless of the state of the earth land of the circuit board. More specifically, when there are a plurality of ground points on the circuit board to be electrically connected to the lower cover, the positions of the ground points in the thickness direction of the circuit board may shift due to manufacturing errors. However, the conductive adhesive is
It is possible to absorb such positional displacement of the plurality of earth points and achieve a highly reliable electrical connection between the earth land and the lower cover.

Further, in this type of card type high frequency equipment, since an extremely thin circuit board is used, the circuit board tends to bend due to the influence of external vibration.
However, in the present invention, the circuit board is mechanically fixed to the specific location by the conductive adhesive, so that the rigidity of the circuit board is supplemented by the lower cover, and the circuit board becomes difficult to bend, and Even if the board bends, the electrical connection between the earth land and the lower cover is maintained. Therefore, the shield performance can be stabilized.

[0018]

Embodiments Embodiments in which the present invention is applied to an electronic tuner will be described below.

FIG. 2 is a perspective view showing the appearance of the card type electronic tuner 1 according to the embodiment of the present invention. Figure 1
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 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. 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. The outer surfaces of the upper cover 4 and the lower cover 5 can be appropriately used as surfaces for printing or the like.

A circuit board is housed in the case 2. The circuit board comprises a printed circuit board 6 in this example. Further, the lower cover 5 has a double structure and is constituted by a cover outer surface member 42 and a cover inner surface member 43. In FIG. 1, the entire cover outer surface member 42 is illustrated, but only the contact 44 which is a part of the cover inner surface member 43 is illustrated. The frame 3, the printed circuit board 6, and the cover inner surface member 43 are shown in FIG. 3 in a state of being separated from each other.

As the printed circuit board 6, for example, a double-sided wiring type board made of a glass epoxy board 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. On the lower surface of the printed circuit board 6, required wirings and ground lands that are electrically connected to the wirings on the upper surface through through holes are provided. The lower surface of the printed circuit board 6, except for the ground point with the lower cover 5,
As will be described later, it is covered with an insulating film.

The printed circuit board 6 may be made of, for example, 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 periphery of 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. Further, in this embodiment, as shown in FIG. 1, the positioning of the printed circuit board 6 is made more reliable by the cover inner surface member 43.

The cover inner surface material 43 is obtained by sheet metal working of a single metal plate, as well shown in FIG. The cover inner surface member 43 is provided with a shield wall 45 that stands up at its periphery, and a plurality of shield walls 46 that stand up at the center of the main surface portion. The above-mentioned contact piece 44 is provided at the upper end of each of the shield walls 45 and 46. Further, a convex portion 47 is formed along one edge of the cover inner surface member 43. The convex portion 47 is the connector 8
It contacts the underside of and functions to support it. Also,
A plurality of screw holes 48 are provided in the main surface of the cover inner surface member 43.
Is provided.

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 cover inner surface material 43.

The frame 3 has a U-shaped outer peripheral wall 51 for surrounding the shield wall 45. Outer wall 51
A recess 52 for receiving the connector 8 is formed on the open end side of the. In addition, 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 pieces 44 are inserted are provided in the frame 3.
Is provided. Further, a recess 55 for absorbing the thickness of the upper cover 4 shown in FIG. 1 is provided on the upper surface of the frame 3.

The frame 3, the printed circuit board 6 and the cover inner surface member 43 are stacked in a positional relationship as shown in FIG. In this state, the shield wall 45 is positioned 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 is disposed on the printed circuit board 6.
Through the slot 49. Further, the contact piece 44 penetrates the slot 54 of the frame 3. These contact pieces 44 are
As shown in FIG. 1, it is folded on the upper surface of the frame 3. In this state, screws (not shown) are inserted into the screw holes 48 and 50 from below the cover inner surface material 43,
The frame 3, the printed circuit board 6, and the cover inner surface member 43 are mechanically integrated with each other by being screwed into the frame 3.

Next, the upper cover 4 is attached to the frame 3, and
The cover outer surface member 42 is fixed to the cover inner surface member 43 with an adhesive or a pressure sensitive adhesive, respectively. At this time, in the upper cover 4 shown in FIG. 1, the area 56 shown by the broken line is prevented from being applied with the adhesive or the adhesive.
These regions 56 are located corresponding to the contact pieces 44, so that the contact pieces 44 electrically contact the lower surface of the upper cover 4. In addition, the outer cover material 42
Covers the opening formed as a result of the formation of the shield wall 46 and the contact piece 44 connected to the shield wall 46 in the cover inner surface material 43, thereby preventing the deterioration of the shielding property and improving the appearance.

Although not shown, it is preferable that a recess for absorbing the thickness of the contact piece 44 is provided on the upper surface of the frame 3 and below each bent contact piece 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.

FIG. 5 is an enlarged sectional view showing a part of each of the printed circuit board 6 and the lower cover 5. Figure 6
In the figure, the printed circuit board 6 on which the connector 8 shown in FIG. 3 is mounted is shown alone.

As shown in FIG. 5, the printed circuit board 6 is formed with a number of conductor layers 57 and 58 to provide required wiring and ground lands. Among these conductor layers 57 and 58, the conductor layer 58 formed on the surface facing the lower cover 5 side of the printed circuit board 6 functions as an earth land. Insulating films 59 and 60 are formed on both surfaces of the printed circuit board 6 so as to cover the conductor layer 57 and the like except for the conductor layer 58 serving as an earth land. These insulating films 59 and 60 are for preventing unwanted adhesion of solder and electrical short circuit. In addition, the plating layer 6 is formed on the conductor layer 58 that becomes the earth land.
1 may be formed. The plating layer 61 and the conductor layer 58 provide a ground point.

Further, as shown in FIG. 5, the plating layer 61 serving as an earth land and the plating layer 61 of the cover inner surface material 43.
A conductive adhesive 62 is applied between the surface facing toward the front surface and the inner surface member 43 of the cover. The conductive adhesive 62 is used for the printed circuit board 6
And the cover inner surface member 43 are not only mechanically fixed to each other, but also the plating layer 61 and the conductor layer 5 that serve as earth lands.
8 and the cover inner surface member 43 are securely connected electrically. In this state, even if the printed circuit board 6 tries to bend, the cover inner surface material 43 and hence the lower cover 5 also bend following it, so that the above-mentioned electrical connection state is maintained. Further, the rigidity of the printed circuit board 6 is supplemented by the cover inner surface material 43 or the lower cover 5 by the mechanical adhesive effect of the conductive adhesive 62, and the above-described bending itself of the printed circuit board 6 is less likely to occur.

The fixed portions by the conductive adhesive 62 as described above are distributed in several places according to the number of earth points required. In FIG. 6, a region to which the conductive adhesive 62 is applied is indicated by a broken line. A conductive adhesive 62 is applied to the lower surface of the printed circuit board 6 according to FIG. 6 at several points. The conductive adhesive 62 applied to these areas is entirely the printed circuit board 6
However, some of them may not function to prevent the printed circuit board 6 from bending as described above. The conductive adhesive 62 is shown in FIG.
For example, a dispenser, screen printing, or the like is used for application as shown in FIG.

As shown in FIG. 5, a plating layer 61 is formed on the conductor layer 58 which serves as an earth land. Such a plating layer 61 is made of, for example, copper foil.
We are trying to prevent 8 oxidation. However, since the conductive adhesive 58 can also prevent the conductive layer 58 from being oxidized, it is not necessary to form the plated layer 62.

Further, in the above-mentioned embodiment, the lower cover 5
However, the cover outer surface material 42 and the cover inner surface material 43 have a double structure, but may be composed of a single plate made of a conductive material such as a metal plate.

In FIG. 3, several electronic components 7 are typically shown on the printed circuit board 6.
Various circuits are configured on such a printed circuit board 6. The circuit configured 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 a VHF circuit unit 12 and a U unit.
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 38, 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 arranged in different areas of the printed circuit board 6, respectively. The shield wall 46 of the cover inner surface member 43 shown in FIG. 3 is located so as to separate the tuner circuit section 9, the channel control circuit section 10 and the demodulation circuit section 11 from each other, and electromagnetic fields between them are separated. It is designed to prevent interference.

Although not shown in the drawings regarding the embodiment of the card type electronic tuner 1 described above, the receiving antenna may be externally attached or built in the card type electronic tuner 1.

The present invention can be applied not only to electronic tuners but also to other high-frequency equipment such as RF modulators. When the RF modulator has a transmitting function, the transmitting antenna may be attached externally or internally.

[Brief description of 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 a card-type electronic tuner shown in FIG. 1 in an assembled state.

FIG. 3 is a frame 3 and a printed circuit board 6 shown in FIG.
FIG. 6 is a perspective view showing the cover inner surface member 43 in a disassembled state.

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

5 is an enlarged cross-sectional view showing each part of a printed circuit board 6 and a lower cover 5 included in the card type electronic tuner 1. FIG.

6 is a perspective view showing the printed circuit board 6 alone on which the connector 8 shown in FIG. 3 is mounted.

[Explanation of symbols]

 1 Card type electronic tuner (card type high frequency equipment) 2 Case 3 Frame 4 Upper cover 5 Lower cover 6 Printed circuit board 7 Electronic parts 8 Connector 9 Tuner circuit section 10 Channel control circuit section 11 Demodulation circuit section 12 VHF circuit section 13 UHF circuit Part 43 Cover Inner Surface Material 58 Conductor Layer to Become Earth Land 61 Plating Layer 62 Conductive Adhesive

Claims (1)

[Claims] 1. A card-type case, a circuit board housed in the case, and an electrical connection to the circuit board,
And a connector arranged along one side, 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 opening of the frame, and a lower opening of the frame. A bottom cover made of a conductive material that closes is formed on a surface of the circuit board facing the bottom cover, and the ground land of the bottom cover and the ground land, A card-type high-frequency device that is fixed to each other with a conductive adhesive.