JPH06188759A - Card type electronic equipment - Google Patents

Abstract

PURPOSE:To prevent a general user from removing a screw carelessly and decomposing a case by hiding a screw stopping part behind a shield material. CONSTITUTION:A case 2 of the card type electronic tuner 1 consists of the case main body consisting of an upper cover 4 and a frame 3, and a lower cover 5 fixed to the case main body with the screw. The lower cover 5 has a recessed part 57 in an area including the screw stopping part and the shield material is formed in the recessed part 57.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a card type electronic device, and more particularly to improvement of the structure of a card type case.

[0002]

2. Description of the Related Art A card type electronic device such as an IC memory card is usually a card type case, a circuit board housed in the case, and one side of the case electrically connected to the circuit board. And a connector arranged along the line. In the card-type electronic device as described above, at least one main surface of the case is provided by a cover separate from the case body in order to facilitate the incorporation of the circuit board in the case. After assembling the circuit board into the body, it is fixed to the case body.

As a means for fixing the above-mentioned cover to the case main body, there is a method using an adhesive tape or an adhesive agent. In this method, a defect was found inside after assembling the card type electronic device. At this time, it is difficult to separate the cover from the case body, and of course, the repair thereof is extremely difficult.

Therefore, in an electronic device of the kind in which the final performance can be obtained only after the elements to be adjusted are mounted on the internal circuit board and the assembled state is reached, the cover is cased in consideration of the ease of disassembly and repair. A screwing method is often used as a means for fixing to the main body.

[0005]

However, in the case of the screw-fastening method, not only the disassembly by a specialist but also the general consumer becomes easy. If the card-type electronic device is disassembled and the internal parts are touched by general consumers, the performance may deteriorate, the function may be impaired, or a fatal failure may occur. It is necessary to take measures.

[0006] Therefore, an object of the present invention is to provide a structure of a card type electronic device which can prevent the above-mentioned inadvertent disassembly by general consumers.

[0007]

According to the present invention, a card type case, a circuit board housed in the case, and an electrical connection to the circuit board and arranged along one side of the case. The connector is provided with a connector, and the case includes an upper cover part extending parallel to the upper main surface of the circuit board and a frame part for positioning the periphery of the circuit board, and a case body for receiving the circuit board from below, and a lower main part of the circuit board. A lower cover that extends parallel to the surface and is screwed to the case body, and is directed to a card-type electronic device,
In order to solve the above-mentioned technical problem, the lower cover is provided with a recess at least in a region including the screwed portion, and a shielding material is formed in the recess.

In this specification, with respect to the case and the circuit board, the expressions "upper" and "lower" are used to indicate the respective directions or positions, but these are relatively determined and are intended to be limited. It is pointed out that it is not.

[0009]

In the present invention, the concave portion serves to make the presence of the shielding material invisible, and the shielding material serves to hide the presence of the screw in the screwed portion.

[0010]

As described above, according to the present invention, the possibility of disassembling cannot be recognized from the outside of the card-type electronic device, so that it is possible to prevent general consumers from feeling conscious of disassembling. Therefore, it is possible to prevent the internal parts from being touched due to careless disassembly, resulting in deterioration of performance, loss of function, or fatal failure.

Further, the presence of the shielding material can prevent undesired loosening of the screw. In the case of this type of card-type electronic device, the connector provided therein and the connector paired with the connector are frequently attached and detached, but the screw is loosened by the repeated attachment and detachment, and further, the screw is not attached. Detaching in a loosened state may result in a situation where desorption is difficult or mechanical damage may occur. However, according to the present invention, as described above, it is possible to prevent the loosening of the screw, so that it is possible to eliminate these problems.

Further, the shielding material of the present invention can be made to function as an area for decoration by printing or the like, and the appearance of this type of card type electronic device can be improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments in which the present invention is applied to a card type electronic tuner will be described below. A product called a card-type electronic tuner has not been marketed yet, but it was developed under the following background.

A television receiver requires 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. At present, as a device having a video display function which is generally used, there are a video device such as a personal computer having a display, an information device, and the like, in addition to the above-mentioned television receiver. 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.

Under such a background, there has been proposed a card type electronic tuner having a form suitable for mounting on a desired device as needed.

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.

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 electronic tuner or RF modulator is mounted may be accommodated in a card-type case. it can. Input / output of signals can be performed via the connector.

Therefore, a card type high frequency device such as an IC memory card as a whole is
It is easy to store and carry, and is suitable for handling as an optional accessory for various video equipment or information equipment. 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 device on a video device or an information device, a slot is provided in the body of such a device, for example, a card type high frequency device can be mounted, and the slot is provided. In connection with the above, a connector that makes a pair 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.

FIG. 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
3 is an enlarged cross-sectional view taken along the line II-II in FIG.
FIG. 3 is an enlarged sectional view taken along the line III-III in FIG. 1.
FIG. 4 is an exploded perspective view showing elements included in the card-type electronic tuner 1 shown in FIG. FIG. 5 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, polycarbonate and polyamide. 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.

Since the upper cover 4 and the lower cover 5 exhibit a shielding property, they are preferably made of a conductive material such as a metal plate.

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 except for the ground connection portion with the lower cover 5.

The printed circuit board 6 may be made of ceramic, for example, or may have a multi-layered structure.

As described above, the connector 8 surface-mounted on the printed circuit board 6 is of the 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 and the upper cover 4 is provided.
And extends in parallel with each of the lower covers 5.

The electronic component 7 shown in FIGS. 2, 3 and 4.
Various circuits are formed on the printed circuit board 6 as represented by. The circuit configured on this printed circuit board 6 is shown in FIG.

Referring to FIG. 5, 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 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.

Case 2 which is a feature of this embodiment will be described below.
The assembling structure will be described mainly with reference to FIGS.

The upper cover 4 has mounting pieces 43 integrally formed, for example, at its four corners. These mounting pieces 43 are provided with a part of a metal plate or the like that constitutes the upper cover 4,
It has a length exceeding the thickness of the frame 3. Mounting piece 4
Each of the 3 is provided with a screw hole 44. In addition, as shown in FIG. 2, the attachment piece 43 is bent when the upper cover 4 is combined with the frame 3.

On the other hand, the frame 3 has the above-mentioned mounting piece 43.
A slot-shaped mounting hole 45 for receiving each of the above is formed. Further, the frame 3 has screw holes 46 (FIG. 2) corresponding to the screw holes 44 of the mounting piece 43 bent as described above.
Is provided. Further, the frame 3 is provided with a step portion 47 into which the outer peripheral portion of the upper cover 4 is fitted.

The lower cover 5 is provided with screw holes 48 corresponding to the screw holes 44 and 46 described above. A dish 50 is formed around each of the screw holes 48 so that the head of a screw 49 inserted therein does not protrude.

A shield wall 51 that stands up is formed around the lower cover 5, and convex portions 52 that further project are formed at a plurality of locations on the shield wall 51. The frame 3 is provided with a penetrating portion 53 that receives these convex portions 52. The shield wall 51 not only fulfills the shield function, but also ensures the alignment between the lower cover 5 and the frame 3 and enhances the rigidity of the lower cover 5. Regarding the shield property, the shield property may be exhibited by providing conductivity to at least the surface of the frame 3 without providing the shield wall 51.

The printed circuit board 6 is provided with a through hole 54 corresponding to the above-mentioned screw hole 48 to receive the dish-shaped portion 50. The connector 8 mounted on the printed circuit board 6 is located in the recess 55 provided in the frame 3 and is in contact with the projection 56 formed in the lower cover 5.

The lower cover 5 is further provided with a recess 57 so as to include the region in which the above-mentioned screw hole 48 is provided.

When the printed circuit board 6 is assembled and the case 2 is assembled in the case 2 composed of the frame 3, the upper cover 4 and the lower cover 5 as described above, the mounting piece 43 of the upper cover 4 corresponds to the mounting of the frame 3. It is inserted into the hole 45. Then, the attachment piece 43 is bent as shown in FIG. Next, the printed circuit board 6 on which the connector 8 is mounted is received from below the frame 3, and then the lower cover 5 is assembled into the frame 3 from below. At this time, the shield wall 51 of the lower cover 5 is fitted to the inner circumference of the frame 3, and the convex portion 52 is received in the through portion 53. The screw 49 is then inserted through the screw hole 48 and screwed into the screw holes 44 and 46. At this stage, it is preferable to inspect whether the card-type electronic tuner 1 to be obtained is a good product. After it is confirmed that it is a good product, the shielding material 5 is placed in the recess 57 of the lower cover 5 described above.
8 is formed. As a result, the screw 49 can be covered by the shield 58 to hide its presence. As the shielding member 58, for example, a sheet or a thin plate is used, which may be attached to the lower cover 5 or may be formed by pouring a resin used as an adhesive or a filler. Such a shielding material 58 is preferably one that does not easily come off, and is preferably opaque.

Incidentally, the concave portion 57 in which the shielding material 58 is formed
Need not be provided over a wide area of the lower cover 5 as in the illustrated embodiment, but may be independently provided only in the peripheral portion of the screw hole 48.

Further, in the above-mentioned embodiment, the upper cover 4 cannot be removed from the frame 3 unless the screw 49 is loosened to separate the lower cover 5 from the frame 3. However, such a structure is not essential, and for example, the upper cover 4 and the frame 3 may be provided by an integral case body. Further, the upper cover 4 also has a structure to be attached to the frame by screws like the lower cover 5, and these screws are also
A concealing structure with a shielding material similar to that of the lower cover 5 may be adopted.

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

The present invention is not limited to the electronic tuner as described above, but can be applied to other high-frequency equipment such as an RF modulator, and can also be applied to electronic equipment other than the high-frequency equipment. .

[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 an enlarged sectional view taken along the line III-III in FIG.

4 is an exploded perspective view showing elements included in the card-type electronic tuner 1 shown in FIG. 1. FIG.

5 is a block diagram showing an electric circuit included in the card type electronic tuner 1 shown in FIG. 1. 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 component 8 connector 9 tuner circuit section 10 channel control circuit section 11 demodulation circuit section 12 VHF circuit section 13 UHF circuit section 43 mounting piece 44, 46, 48 Screw hole 45 Mounting hole 49 Screw 50 Plate-shaped portion 57 Recessed portion 58 Shielding material

Claims (1)

[Claims] 1. A card-type case, a circuit board accommodated in the case, and a connector electrically connected to the circuit board and arranged along one side of the case, The case includes an upper cover portion extending parallel to the upper main surface of the circuit board and a frame portion for positioning the periphery of the circuit board, and a case body that receives the circuit board from below, and a lower main surface of the circuit board. A lower cover that extends in parallel with and is screwed to the case body, wherein the lower cover is provided with a recess in a region including at least the screwed portion, and the recess is provided with a shielding material. , Card type electronic devices.