JP3254774B2 - 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.

The above-mentioned circuit board comprises the frame and the lower part.
Are sandwiched by the cover, also on the surface facing the lower cover of the circuit board, the grounding land is formed, while the surface facing the ground lands of the lower cover, the front
By slightly bending the circuit board, a projection is formed which elastically contacts the earth land.

[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. In addition, as in the above configuration,
Elastic contact between the protrusion and the earth land by slightly bending the plate
To ensure that these contacts are maintained.
It works. Furthermore, this card-type high-frequency device
For example, the frame is positioned on the frame at a position facing the protrusion.
It is preferable to provide notches that allow the circuit board to bend.
Good. Thereby, the ground of the circuit board facing the projection is provided.
When a part of the frame is located at the point,
The notch allows the circuit board to bend.
Become like

[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. That is, first, the upper cover and the lower cover made of a conductive material are provided, and the lower cover is in contact with the ground land of the circuit board via the protrusion, and as a result, sufficient shielding properties can be provided. . For this reason, it is possible to prevent inconveniences such as radio interference and reception interference from occurring in such high-frequency devices.

The projections formed on the lower cover allow the lower cover to reliably contact the ground land of the circuit board. More specifically, when there are a plurality of ground points on the circuit board to be brought into contact with the lower cover, a plurality of projections are formed on the lower cover correspondingly. At this time, even if the positions of the ground points in the thickness direction of the circuit board may be shifted from each other due to a manufacturing error, each projection may partially bend the circuit board slightly and move to the corresponding ground point. Enables reliable contact.

In this type of card-type high-frequency device, since an extremely thin circuit board is used, the circuit board may bend under the influence of external vibration or the like. However, the presence of the protrusion slightly deforms the circuit board and keeps the protrusion and the earth land in an elastic contact state at all times. Therefore, even if the circuit board is bent by the influence of vibration or the like, the contact between the protrusion and the earth land may occur. State can be maintained. Therefore, it is possible to stabilize the shielding performance.

[0018]

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 the 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 product made of a synthetic resin having an 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. The lower cover 5 has a double structure, and includes a cover outer surface member 42 and a cover inner surface member 43. In FIG. 1, the entire outer cover member 42 is illustrated, but only the contact piece 44 that is a part of the inner cover member 43 is illustrated. FIG. 3 shows the frame 3, the printed circuit board 6, and the cover inner surface material 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. The lower surface of the printed circuit board 6 is provided with required wiring and ground lands that are electrically connected to the wiring on the upper surface via through holes. The lower surface of the printed circuit board 6, except for the ground point with the lower cover 5,
As described later, it is covered with an insulating film.

The printed circuit board 6 may be made of ceramic, 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 cover inner surface material 43.

As shown in FIG. 3, the cover inner surface member 43 is obtained by sheet metal working a single metal plate. The cover inner surface member 43 includes a shield wall 45 rising at the periphery thereof and a plurality of shield walls 46 rising 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. Further, a convex portion 47 is formed along one edge of the cover inner surface material 43. The protrusion 47 is connected to the connector 8.
Functions to support and support the lower surface of the Also,
A plurality of screw holes 48 are provided in the main surface of the cover inner surface material 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 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 cover inner surface material 43 are superimposed 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 is
Through the slot 49. Furthermore, the contact piece 44 passes through the slot 54 of the frame 3. These contact pieces 44
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 material 43 are mechanically integrated with each other.

Next, the upper cover 4 is attached to the frame 3 and
The outer cover member 42 is fixed to the inner cover member 43 with an adhesive or a pressure-sensitive 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. Also, the cover outer surface 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 shield performance from deteriorating and performing the function of improving the appearance.

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.

FIG. 5 is a schematic sectional view of the card-type electronic tuner 1. FIG. 6 is a partially enlarged view of FIG.

Although not shown in FIG. 3, the printed circuit board 6 is provided on the inner cover 43 of the lower cover 5.
A plurality of protrusions 57 are formed so as to protrude in the direction toward.
Further, as shown in FIG. 6, the printed circuit board 6 is formed with several conductor layers 58 and 59 and the like in order to provide required wiring and ground lands. These conductor layers 5
Of the layers 8 and 59, the conductor layer 59 formed on the surface facing the lower cover 5 side of the printed circuit board 6 functions as an earth land. The conductor layer 59 serving as an earth land
Except for the above, insulating films 60 and 61 are formed on both surfaces of the printed circuit board 6 so as to cover the conductor layer 58 and the like.
These insulating films 60 and 61 are for preventing undesired adhesion of solder and electrical short circuit. In addition, a plating layer 62 may be formed on the conductor layer 59 serving as an earth land. The plating layer 62 and the conductor layer 59 provide an earth point.

As shown in FIG. 5, the projection 57 formed on the inner surface material 43 of the cover is provided with the plating layer 6 serving as an earth point.
2, while trying to lift the printed circuit board 6 slightly upward. Since the printed circuit board 6 is positioned by the frame 3 as described above,
It is not lifted as a whole, and causes a slight bending at the contact portion with the projection 57. As a result, when the tip of the projection 57 is in a front chain shape, the tip bites into the plating layer 62, and at the same time, the elastic contact state is always maintained between the projection 57 and the plating layer 62.

The above-mentioned protrusions 57 may be provided at any number of places according to the number of required earth points, or a plurality of protrusions may be provided for the same earth point. In addition, the size and shape of the projection are appropriately selected, and are not particularly limited. Further, projections having different sizes or shapes may be combined. In FIG. 3, some electronic components 7 are typically shown on a printed circuit board 6. 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 roughly includes a tuner circuit section 9, a channel control circuit section 10, and a 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 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 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, 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 cover inner surface material 43 shown in FIG. 3 is positioned 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. It is designed to prevent electromagnetic interference.

FIG. 7 shows another embodiment of the present invention. In FIG. 7, elements corresponding to the elements shown in FIGS. 1 to 6 described above are denoted by the same reference numerals, and redundant description will be omitted.

In this embodiment, a notch 63 is provided in a part of the frame 3 so that the printed circuit board 6 can be bent at a portion lifted by the projection 57. This embodiment is advantageously applied when a part of the frame 3 is located at the position of the earth point where the projection 57 is to be brought into contact.

FIGS. 8 and 9 show still another embodiment of the present invention. In FIGS. 8 and 9, elements corresponding to the elements shown in FIGS. 1 to 6 described above are denoted by the same reference numerals, and redundant description will be omitted.

In this embodiment, a slit 6 extending in, for example, an arc shape or a U shape is formed in a part of the printed circuit board 6.
4 are provided. The slit 64 makes it possible to partially deflect the printed circuit board 6 only at a portion where the projection 57 contacts. According to this embodiment,
For example, the printed circuit board 6 can be bent flexibly by the contact of the protrusion 57 even in a region that is not easily bent near the frame 3. Further, even if the bending is very small, such a slit 64 can be advantageously provided in a place where it is not desired to transmit the stress generated by the bending to a nearby electronic component. The shape of the slit 64 is arbitrary.

In the above-described embodiment, for example, as shown in FIG.
However, such a plating layer 62 is not always necessary. That is, the protrusion 57 may be brought into direct contact with the conductor layer 59. However, the presence of the plating layer 62 can prevent the conductor layer 59 made of, for example, copper foil from being oxidized.

In the above-described embodiment, the lower cover 5
Although the cover has a double structure of the cover outer surface member 42 and the cover inner surface member 43, the cover outer surface member 42 and the cover inner surface member 43 may be simply formed of a single plate made of a conductive material such as a metal plate.

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 can be applied not only to the electronic tuner but also to other high-frequency devices such as an RF modulator.

[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 a state where a cover inner surface member 43 is disassembled.

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

FIG. 5 is a cross-sectional view schematically showing the card-type electronic tuner 1 shown in FIG.

FIG. 6 is an enlarged cross-sectional view showing a part of FIG. 5;

FIG. 7 shows a frame 3 included in another embodiment of the present invention;
FIG. 4 is a cross-sectional view showing a printed circuit board 6 and a cover inner surface material 43.

FIG. 8 is a plan view showing a printed circuit board 6 and a cover inner surface member 43 included in still another embodiment of the present invention.

FIG. 9 is a sectional view taken along lines IX-IX in FIG. 8;

[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 Cover inner surface material 57 Projection 59 Conductor layer serving as earth land

Continuation of the front page (56) References JP-A-57-198588 (JP, A) JP-A-2-87833 (JP, A) JP-A 64-37087 (JP, U) JP-A-59-121703 (JP , U) Tokiohei 2-501650 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04B 1/08

Claims (2)

(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, wherein the circuit board is formed by the frame and the lower cover.
An earth land is formed on the surface of the circuit board facing the lower cover, while the circuit board is slightly bent on the surface of the lower cover facing the earth land .
A card-type high-frequency device, wherein a projection is formed to elastically contact the earth land. 2. The frame at a position facing the projection.
A notch that allows the circuit board to bend,
The card-type high-frequency device according to claim 1.