JPH06197029A - Card type high frequency equipment - Google Patents

Abstract

PURPOSE:To provide an externally mounted electronic tuner which is loaded to a main body such as a personal computer not always requiring the tuner to receive a television video image and audio signal only when the signal is desired to be received. CONSTITUTION:A printed circuit board 6 forming a tuner circuit section, a channel control circuit section and a demodulation circuit section is built in a card type case 2, and a connector for inputting and outputting a signal to/from the printed circuit board is arranged along one side of the case 2. A frame 3 being the component of the case 2 is provided with a crosspiece 44 in contact with an upper cover 4 and the crosspiece 44 is provided with a strut 44a projecting downward so as to contact with the printed circuit board 6. Deformation of the upper cover 4 is prevented by the bridge 44 and deformation of a lower cover 5 and a printed circuit board 1 is prevented by the support 44a, then the entire stiffness of the card type electronic tuner is enhanced.

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 improvement of the form of such a high frequency device.

[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 case includes a frame for positioning the circuit board, an upper cover for closing the upper opening of the frame, and a lower cover for closing the lower opening of the frame and contacting the lower surface of the circuit board. Further, a crosspiece provided between the plurality of different positions of the frame is provided inside the frame so as to be in contact with the upper cover, and a post protruding downward is in contact with the upper surface of the circuit board on the crosspiece. Is provided as follows.

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

[0012]

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, for example, a slot in which the card type high frequency equipment can be mounted 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.

Further, according to the present invention, since the frame is provided with the crosspiece which is in contact with the upper cover, the dent due to the external force of the upper cover is prevented. In addition, the crosspiece is provided with a pillar that contacts the upper surface of the circuit board, and the lower cover contacts the lower surface of the circuit board, so that the lower cover and the circuit board can be prevented from being deformed by an external force. In this type of card-type high-frequency equipment, extremely thin ones are used as the circuit board and the upper and lower covers, respectively,
Even if external pressing force, impact force, vibration, etc. are applied,
The action of the crosspieces and columns of the frame described above can prevent the circuit board and the upper cover and the lower cover from being bent, deformed, or vibrated. Therefore, when the present invention is applied to the card type electronic tuner, the tuning state can be stably maintained. Further, when vibration occurs in the circuit board, stress is repeatedly generated between the pattern land formed on the circuit board and the electrode of the electronic component to be mounted, but the vibration of the circuit board is suppressed as described above. Since such stress is also reduced, the reliability of electrical connection is improved. Further, the presence of the crosspieces and columns provided on the frame can increase the rigidity of the entire card type high frequency device without significantly increasing the weight of the entire card type high frequency device.

[0015]

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

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
FIG. 2 is an enlarged sectional view taken along the line II-II in FIG. 1. Figure 3
FIG. 3 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 circuit board is housed in the case 2 with its lower surface in contact with the lower cover. The circuit board comprises a printed circuit board 6 in this example. 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. 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.

The printed circuit board 6 may be made of, for example, a ceramic material, or may have a multi-layered structure. Further, each outer surface of the lower cover 5 and the upper cover 4 can be appropriately used as a surface 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 along the short side of the case 2, for example.

As represented by the electronic component 7 shown in FIG. 2, various circuits are formed on the printed circuit board 6. The circuit constructed on this printed circuit board 6 is shown in FIG.

Referring to FIG. 3, 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.

As shown in FIG. 2, the upper cover 4 is arranged parallel to the printed circuit board 6. This top cover 4
Is shown alone in FIGS. 4 and 5. Top cover 4
Is made of a metal plate such as stainless steel and has a plurality of claws 43 formed on both side edges thereof. As shown in FIG. 5, the claws 43 have L-shapes facing in the same direction. Nail 43
Is formed, for example, by bending a part of the metal plate that constitutes the upper cover 4.

The frame 3 is shown alone in FIGS. 6 to 8. 6 is a plan view of the frame 4, FIG. 7 is a bottom view of the same, and FIG. 8 is a line VIII of FIG.
FIG. 8 is a cross-sectional view taken along line VIII.

The frame 3 is an integrally molded product obtained by die casting of aluminum, for example. As described above, when the frame 3 is made of a metal such as aluminum, the frame 3 can be provided with light weight, rigidity and conductivity. For the purpose of obtaining the same performance, the frame 3 may be made of fiber-reinforced plastic that is metal-plated or conductively coated. The purpose of imparting conductivity to the frame 3 is to improve the shielding property, and as described above, the upper cover 4 may be made of a metal plate.
It contributes to the improvement of the shield property. Therefore, the lower cover 5
Also, preferably, it is composed of a metal plate.

The frame 3 is provided with a crosspiece 44 which is provided inside the frame 3 between a plurality of different positions of the frame 3. As shown in FIG. 2, the crosspiece 44 is selected in its position, thickness and number so as to avoid the electronic parts 7 that require external adjustment and the tall ones. The crosspiece 44 reinforces the frame 3 itself and contacts the upper cover 4 as shown in FIG. 2 and FIG. 9 described later to prevent the upper cover 4 from denting inward.

A shield partition wall 46 is formed along a part of the crosspiece 44 as shown in FIG. The shield partition wall 46 includes the first area 40 and the second area shown in FIG. 1 in which the tuner circuit section 9, the channel control circuit section 10 and the demodulation circuit section 11 formed on the printed circuit board 6 are arranged. 41 and the third region 42 are divided to extend so as to make electrical contact with an earth land on the printed circuit board 6. As a result, the tuner circuit unit 9, the channel control circuit unit 10, and the demodulation circuit unit 11 are shielded from each other. In the shield partition wall 46, the above-mentioned notch 45a,
45b, 45c are formed, and these notches 45a,
45b and 45c allow passage of the tuner circuit section 9, the channel control circuit section 10, and the demodulation circuit section 11 while avoiding undesired electrical contact with a wiring pattern that extends between them.

The frame 3 serves to position the printed circuit board 6. Therefore, the frame 3 has a plurality of screw holes 4 for screwing the printed circuit board 6.
7a to 47e are provided. These screw holes 47a to 47
The number and position of e can be arbitrarily changed as needed. Screws (not shown) screwed into all or part of these screw holes 47 a to 47 e may be used to fix not only the printed circuit board 6 but also the lower cover 5 to the frame 3. The lower cover 5 may be fixed to the frame 3 by a method such as adhesion or adhesion instead of the above-described screwing.

As shown in FIG. 7, the crosspiece 44 of the frame 3 is provided with a plurality of columns 44a and 44b so as to respectively project downward. These struts 44
The a and 44b are in contact with the upper surface of the printed circuit board 6, as shown in FIG. Note that FIG. 9 shows the line IX-I in FIG.
The sectional view of the card type electronic tuner 1 along X is shown. The columns 44a and 44b advantageously suppress the printed circuit board 6 and the lower cover 5 in contact with the printed circuit board 6 from being bent or vibrated by an external force. These columns 44a
And 44b, which have a relatively small diameter and are provided in spots at positions where they do not interfere with the electronic component 7 on the printed circuit board 6, can sufficiently perform their functions. The numbers and positions of the columns 44a and 44b are
It can be changed as needed.

Around the frame 3, as shown in FIG. 7, a plurality of protrusions 4 abutting on the periphery of the printed circuit board 6 are provided.
8a to 48c are provided. These protrusions 48a to 48c
Also, the lower cover 5 and the printed circuit board 6 are bent by an external force received from below the lower cover 5 to prevent the printed circuit board 6 from being damaged.
The number and position of these protrusions 48a to 48c can be arbitrarily changed as necessary.

Further, the frame 3 is formed with a positioning recess 49 for positioning the above-mentioned connector 8.

Further, the frame 3 is formed with a plurality of fitting portions 50 for engaging the plurality of claws 43 of the upper cover 4 described above. Further, the frame 3 is formed with a recess 51 for accommodating the upper cover 4 within the range of the thickness of the frame 3.

The operation for attaching the upper cover 4 to the frame 3 is shown in FIG. First, FIG.
As shown in (a), the upper cover 4 is aligned with the frame 3 so that the claws 43 are located almost directly above the corresponding fitting portions 50. Then, as shown in FIG. 10B, the claws 43 are fitted in the direction perpendicular to the surface formed by the upper cover 4 so that each of the claws 43 can be received in the corresponding fitting part 50. Inserted inside. Then, FIG.
As shown in (c), the upper cover 4 is moved in the arrow 52 direction with respect to the frame 3. As a result, the nail 43 is
It moves in the direction parallel to the surface formed by the upper cover 4, and the engagement with the fitting portion 50 is completed.

FIG. 10B in the operation as described above.
From the stage shown in FIG. 10 to the stage shown in FIG. 10C, the terminal portion of the upper cover 4 rides on the end wall of the recess 51 and gently bends, as shown in FIG. 10B. It is in a state of being entangled. However, as shown in FIG. 10C, when the engagement of the claw 43 with the fitting portion 50 is completed, the end portion of the upper cover 4 is also accommodated in the recess 51 due to the elasticity of the upper cover 4. Therefore, movement of the upper cover 4 in the front-rear direction, the left-right direction, and the up-down direction is restricted with respect to the frame 3, and a stable mounting state can be realized.

As described above, the state in which the claw 43 is completely engaged with the fitting portion 50 is enlarged and shown in FIG. As shown in FIG. 11, a slope 53 is formed on the upper surface of the tip of the claw 43. Even if the distance between the tip portion of the claw 43 and the upper cover 4 does not have a large clearance with respect to the thickness of the fitting portion 50, the slope 53 is
The claw 43 can be smoothly engaged with the fitting portion 50. Further, the rounded portions 63 and 64 formed on the claw 43
Facilitates the receiving operation of the claw 43 into the fitting portion 50.

Incidentally, the fitting portion 50 of the claw 43 as described above.
The fixing of the upper cover 4 to the frame 3 by the engagement with is not essential to the present invention, and the upper cover 4 may be fixed to the frame 3 by, for example, screwing or adhesion.

Although not shown in the above embodiments, the receiving antenna may be provided externally or internally to 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 equipment such as an RF modulator.

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

FIG. 4 is a plan view showing an upper cover 4 alone.

5 is a diagram showing the upper cover 4 from the right side of FIG. 4. FIG.

FIG. 6 is a plan view showing the frame 3 alone.

FIG. 7 is a bottom view showing the frame 3 alone.

8 is a cross-sectional view taken along the line VIII-VIII in FIG.

9 is an enlarged cross-sectional view of the card-type electronic tuner 1 taken along the line IX-IX in FIG.

FIG. 10 is a partial cross-sectional front view showing a procedure for attaching the upper cover 4 to the frame 3.

11 is an enlarged sectional view showing a state in which a claw 43 is engaged with a fitting portion 50. 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 Components 8 Connector 9 Tuner Circuit Section 10 Channel Control Circuit Section 11 Demodulation Circuit Section 12 VHF Circuit Section 13 UHF Circuit Section 44 Crosspieces 44a, 44b Prop

Claims (1)

[Claims] 1. A card-type case, a circuit board housed in the case, and an electrical connection to the circuit board,
A connector arranged along one side, the case is a frame for positioning the circuit board,
An upper cover that closes an upper surface opening of the frame, and a lower cover that closes a lower surface opening of the frame and is in contact with a lower surface of the circuit board are provided. A card-type high-frequency device, wherein a crosspiece provided is provided so as to be in contact with the upper cover, and a post protruding downward is provided in the crosspiece so as to be in contact with an upper surface of the circuit board.