JP3301121B2 - 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 has at least
A card-type case including an upper cover having electrical properties, a circuit board housed in the case, and configuring a plurality of circuit units in separate regions, and the case being electrically connected to the circuit board, and And a connector arranged along one of the sides.

In the above case, a shield structure made of a conductive material is arranged in addition to the circuit board described above. This shield assembly is formed by integrating an inner cover that covers at least one circuit portion, an inner frame that extends along the inner periphery of the case, and a shield plate that partitions at least one of the circuit portions from another circuit portion. It is. Soshi
After adjusting the circuit, cover the inner cover with the upper cover.
Adjustment holes are provided.

[0011]

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.

Further, the inner cover provided on the shield structure includes:
Since the holes for adjustment are provided therein, it is possible to adjust the circuit section in a state where the shield structure and the circuit board are combined. In addition, the inner frame and shield plate provided in the shield structure block unnecessary electromagnetic interference between a plurality of circuit parts formed on the circuit board, and also act as a high-frequency ground, thereby improving the performance of high-frequency equipment. Performs the function of maintaining stability.

[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.

Further, the shield structure having the above-mentioned function has a relatively high rigidity since the inner cover, the inner frame, and the shield plate are integrated, which leads to a reduction in the number of parts, and thus the card is not required. Assembling of high-frequency type equipment becomes easy. Also, there is a hole for adjustment in the inner cover of the shield structure, such a hole,
Finally, the case can be covered by, for example, an upper cover. Therefore, a preferable structure can be provided in terms of aesthetic appearance and dust prevention. In addition, it is possible to adopt a procedure in which a specific circuit portion is covered with the inner cover and the circuit portion is adjusted, and then, for example, the upper cover is attached. When the adjustment is performed as it is, when the upper cover is attached, it is possible to prevent the occurrence of the adjustment deviation due to the electromagnetic interference by the upper cover.

[0016]

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

FIG. 1 is a perspective view showing an appearance of a card-type electronic tuner 1 according to an embodiment of the present invention. FIG.
FIG. 2 is an enlarged sectional view taken along line II-II in FIG. 1. FIG.
FIG. 2 is a block diagram showing an electric circuit provided in the card-type electronic tuner 1.

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 increased rigidity such as, for example, polyphenylene sulfide, polyethylene terephthalate, polycarbonate, or polyamide 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 preferably made of a conductive material such as a metal plate in order to exhibit a shielding property.

In such a case 2, a circuit board is housed. The circuit board comprises a printed circuit board 6 in this embodiment. On the printed circuit board 6, for example,
A double-sided wiring type made of a glass epoxy substrate having a thickness of 0.5 mm is used. On the upper surface of the printed circuit board 6, required electronic components 7a to 7i,... And a connector 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.
Although not shown, the lower surface of the printed circuit board 6 is covered with an insulating film except for a ground connection with the lower cover 5.

The material of the printed circuit board 6 may be ceramic, for example, or may have a multilayer structure. The outer surfaces of the lower cover 5 and the upper cover 4 can be used as appropriate 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, for example, along the short side of the case 2.

The printed circuit board 6 on which the required electronic components 7a to 7i,... And the connector 8 are mounted is positioned mainly in the case 2 by the frame 3.
For fixing the upper cover 4 and the lower cover 5 to the frame 3,
For example, it is performed by a method such as screwing, bonding, welding or the like.

Various circuits are formed on the printed circuit board 6 as represented by the electronic components 7a to 7i shown in FIG. A circuit formed on the printed circuit board 6 is shown in FIG.

Referring to FIG. 3, the circuits formed on printed circuit board 6 are roughly divided into 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 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 provided in FIG.
, The first area 40 and the second area 4 partitioned by broken lines
The first and third regions 42 are arranged. First area 40
VHF circuit section 12 included in tuner circuit section 9 in FIG.
And the positional relationship between the UHF circuit unit 13 can be arbitrarily changed.

In the case 2, in addition to the above-described printed circuit board 6, a shield structure 43 made of a metal plate is arranged. The shield structure 43 is shown alone in FIG. Also, the frame 3 alone is shown in FIG.

As shown in FIG. 4, the shield structure 43 has an inner cover 44, an inner frame 45, and a plurality of shield plates 46, 47, 48 integrally formed. The inner cover 44 extends so as to cover the first area 40 shown in FIG. 1, that is, the tuner circuit section 9. The inner frame 45 extends along the inner circumference of the frame 3 shown in FIG. As shown in FIG. 1, the shield plates 46, 47, and 48 are provided with a tuner circuit section 9, a channel control circuit section 10, and a demodulation circuit section 11, which are disposed in the first, second, and third regions 40, 41, 42, respectively. Are separated from each other. As shown in FIG.
9, 50 and 51 are provided, and the shield plates 46 and 4 are provided.
7, 48 extend along partition walls 49, 50, 51, respectively.

The frame 3 shown in FIG. 5 shows a step 52 for fitting the above-described upper cover 4 and a recess 53 for positioning the connector 8.

The shield structure 43 is positioned by the frame 3. A plurality of engagement holes 54 are provided at appropriate locations on the inner frame 45 and the shield plates 46 and 48 of the shield structure 43. On the other hand, a plurality of engagement projections 55 corresponding to the engagement holes 54 are provided on the frame 3 side. Therefore, by fitting these engagement projections 55 into the engagement holes 54, respectively, the shield structure 4 is formed.
3 is fixed to the frame 3. Shield structure 43
Slit 56 provided in the vicinity of the specific engagement hole 54
The notch 57 is for making the shield structure 43 more easily elastically deform when the above-mentioned engagement protrusion 55 is fitted to the engagement hole 54.

The inner cover 44 is provided with a plurality of adjustment holes 58 for components which need to be adjusted and which are included in the tuner circuit section 9. FIG. 2 shows specific adjustment holes 58a, 58b, 58c, and 58d among these.
These adjustment holes 58a to 58d are provided corresponding to the positions of electronic components 7a to 7d such as coils included in the tuner circuit unit 9, respectively.

The shield structure 43 is provided with a plurality of contact pieces 59 that come into contact with the earth lands provided on the printed circuit board 6. Further, the shield structure 43 is provided with a plurality of contact pieces 60 that come into contact with the upper cover 4. The inner cover 44 also contacts the upper cover 4.

The fixing of the shield structure 43 to the frame 3 may be performed by, for example, screwing, bonding, or the like, in addition to the fitting of the engaging hole 54 and the engaging projection 55 described above. Further, with respect to the fixing of the shield structure 43 to the frame 3, an embodiment shown in FIGS.

The inner cover 44 is provided with the tuner circuit section 9.
In addition, if necessary, the channel control circuit unit 10
And the demodulation circuit unit 11 may also be provided. Further, shield plates 46 and 4 formed on the shield structure 43 are provided.
7, 48 can be appropriately increased or decreased according to the situation.

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

FIG. 6 is a sectional view showing a card-type electronic tuner 1a according to another embodiment of the present invention. FIG. 7 is a perspective view showing the shield structure 43a and the frame 3a included in the card-type electronic tuner 1a shown in FIG. 6 separately from each other. In these drawings, elements corresponding to the elements shown in FIGS. 1 to 5 described above are denoted by the same reference numerals, and redundant description will be omitted.

In this embodiment, as shown in FIG. 7, the shield structure 43a has attachment pieces 61 formed at, for example, four corners thereof. These mounting pieces 61
It is provided with a part of the metal plate constituting the shield structure 43a, and has a length exceeding the thickness of the frame 3a. Each of the mounting pieces 61 is provided with a screw hole 62. When the shield structure 43a is combined with the frame 3a, the mounting piece 61 is bent as shown by a two-dot chain line in FIG.

On the other hand, the frame 3a is
1 is formed with a slot-shaped mounting hole 63 for receiving each of them. In order to form these mounting holes 63, the frame 3a
Is formed with a seat portion 64 projecting from the inner periphery thereof. Further, the frame 3a is provided with a screw hole 65 corresponding to the screw hole 62 of the mounting piece 61 bent as described above.

In assembling such a shield structure 43a with the frame 3a, the mounting pieces 61 are inserted into the corresponding mounting holes 63 in the posture shown in FIG. Thereafter, the mounting piece 61 is bent. Note that the attachment piece 61 may be bent before such insertion, but in order to facilitate insertion, as described above, the attachment piece 6
Preferably, 1 is bent. Next, as shown in FIG.
The printed circuit board 6 and the lower cover 5 are
The screw 66 is screwed into the screw holes 62 and 65 after penetrating the lower cover 5. by this,
The frame 3a, the shield structure 43a, the printed circuit board 6, and the lower cover 5 are mechanically fixed to each other. In order to prevent the head of the screw 66 from projecting as shown in FIG.
7 are formed, and a recess 68 is preferably formed in the lower cover 5.

In the structure shown in FIG. 6, if an earth land is provided around the hole 67 of the printed circuit board 6, each of the lower cover 5, the shield assembly 43a, the printed circuit board 6 and the upper cover 4 can be grounded. It is connected so as to constitute a circuit, and a shield net can be realized more effectively.

In the above-described embodiment, the mounting piece 61 is provided with the screw hole 62, and the screw 66 is formed to penetrate the screw hole. However, the mounting piece 61 may be simply printed with the frame 3a. It may be merely sandwiched between the circuit board 6.

The number, shape and the like of the mounting pieces 61 are arbitrary. For example, a mounting piece corresponding to such a mounting piece 61 may be further provided at the center of the shield structure 43a.

As described above, according to the embodiment shown in FIGS. 6 and 7, the fixing of the shield structure 43a to the frame 3a is reliably achieved, so that the card-type electronic tuner 1
a The rigidity of the whole can be increased.

In each of the embodiments described above, the shield structure 43 or 43a is made of a metal plate. However, the present invention is not limited to this. A resin plate having a conductive film formed thereon, a composite plate having a conductive layer , Etc.
In short, it may be made of a material having conductivity in some form.

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

[Brief description of the 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 sectional view taken along 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 shield structure 43 shown in FIG. 2 alone;

FIG. 5 is a perspective view showing the frame 3 shown in FIGS. 1 and 2 alone;

FIG. 6 is a sectional view of a card-type electronic tuner 1a according to another embodiment of the present invention.

FIG. 7 is a perspective view showing a shield structure 43a and a frame 3a included in the card-type electronic tuner 1a shown in FIG. 6 separately from each other.

[Explanation of symbols]

 1, 1a Card-type electronic tuner 2 Case 3, 3a Frame 4 Upper cover 5 Lower cover 6 Printed circuit board 7a to 7i Electronic components 8 Connector 9 Tuner circuit unit 10 Channel control circuit unit 11 Demodulation circuit unit 12 VHF circuit unit 13 UHF circuit Part 43, 43a Shield structure 44 Inner cover 45 Inner frame 46, 47, 48 Shield plate 58, 58a to 58d Adjustment hole 59, 60 Contact piece 61 Mounting piece 63 Mounting hole 66 Screw

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-198588 (JP, A) JP-A-60-52098 (JP, A) Fully open Showa 64-37087 (JP, U) Really open Showa 59- 121703 (JP, U) Japanese Utility Model Hei 1-176995 (JP, U) Special Table Hei 2-501650 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04B 1/08

Claims (1)

(57) [Claims] (1) At least a conductive upper cover is included.
A card-type case, a circuit board housed in the case, and constituting a plurality of circuit parts in separate areas, electrically connected to the circuit board, and along one side of the case. And a connector to be disposed, wherein, in the case, an inner cover that covers at least one of the circuit units, an inner frame extending along an inner periphery of the case, and at least one of the circuit units to another circuit unit. the shield plate are integrally formed to partition against the shield structure composed of a conductive material is disposed, by the upper cover after the adjustment of the circuit portion in said cover
Card-type high-frequency device provided with an adjustment hole to be covered .