JPH05175861A - Card type electronic tuner - Google Patents

Abstract

PURPOSE:To provide the external electronic tuner enabling reception while being mounted to a main body only when it is desired to receive the images and sounds of a television at an equipment such as a personal computer or 8mm video not to normally require any tuner. CONSTITUTION:A frame 3 is covered with a cover 4 composed of a metallic plate while positioning a printed circuit board 6, which constitutes a tuner circuit part, channel control circuit part and demodulation circuit part, and a connector 8 by the frame 3. Thus, the obtained card type electronic tuner 1 can be handled similarly to conventionally generally used IC memory cards. Further, it is covered with the cover 4 composed of the metallic plate, shielding performance can be improved and rigidity can be improved as well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic tuner, and more particularly to improving the form of such an electronic tuner.

[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]

As a device having an image display function which is generally used at present, in addition to the above-mentioned television receiver, for example, a personal computer having a display, such as a so-called 8 mm video device. , Information equipment, etc. As a matter of course,
Since a tuner is not built in these video equipment or information equipment, it is not possible to receive a television broadcast and output its 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 necessary, the applications of these equipment can be expanded, and as a result, the commercial value can be increased. it can.

Therefore, the present invention seeks to meet the above-mentioned needs by improving the structure of an electronic tuner.

[0007]

In order to solve the above-mentioned technical problems, the present invention provides a card type electronic tuner.

This card type electronic tuner includes a card type case, a tuner circuit section housed in the case,
A circuit board that constitutes the channel control circuit section and the demodulation circuit section, and a connector that is electrically connected to the circuit board and that is arranged along one side of the case are provided.

Further, the above-mentioned case includes a frame for positioning the circuit board and the connector, and a cover made of a metal plate for covering the frame while exposing the connector to the outside. The covers are opposed to each other.
It has a pair of main surface walls, a pair of opposing side wall surfaces and one end surface wall.

[0010]

According to the present invention, the circuits necessary for the electronic tuner, including the peripheral circuits necessary for reception, are housed in the card type case, and the input / output of signals can be performed via the connector. ..

Further, according to the present invention, almost the entire card type electronic tuner is covered with the metal plate except for the portion where the connector is arranged.

[0012]

Therefore, according to the present invention, an electronic tuner of card type as a whole, such as an IC memory card, can be obtained. Such a card-type electronic tuner is easy to store and carry, and is suitable for handling as an optional accessory for various video equipment or information equipment. Therefore, it is not necessary to store a function that is not always used in the main body of these devices, such as a function as a television receiver in a video device or an information device. It can be prevented.

Further, the card type electronic tuner according to the present invention is provided with all circuits necessary for the tuner including peripheral circuits necessary for reception, and enables signal input / output through the connector. Therefore, they can be made to function as a television receiver by mounting them on the main body of the video equipment or the information equipment when necessary. In this case, the main body of the video equipment or the information equipment is provided with, for example, a slot in which the card type electronic tuner can be mounted, and a connector paired with the connector provided in the card type electronic tuner is associated with this slot. It should 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, since the cover made of a metal plate covers almost all of the card type electronic tuner, it is possible to prevent radio waves from entering and unnecessary radiation, and to improve the shielding performance. Such a cover can also be used as a conductor for ground connection.

Further, the presence of the cover made of a metal plate enhances the rigidity of the case. This is particularly effective for a card type case where reinforcement is restricted.

Further, in order to integrate the case, when attaching the cover to the frame, for example, screwing can be applied to the side wall or the end wall of the cover. Therefore, it is possible to prevent such a screwed portion from interfering with the component layout space on the circuit board, and it is possible to effectively utilize the component layout space on the circuit board.

[0017]

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 a perspective view showing a state where the card type electronic tuner 1 shown in FIG. 1 is being assembled. 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. The case 2 includes a frame 3 and a cover 4. Such a case 2 is preferably sized substantially the same as a general-purpose IC memory card.

The frame 3 is formed of a molded product made of a synthetic resin having an increased rigidity such as glass fiber reinforced polyphenylene sulfide, polyethylene terephthalate, and polycarbonate. Such a frame 3 may be subjected to metal plating, conductive coating, or the like at a necessary portion for the purpose of improving the shield property.

The cover 4 is made of a metal plate and has a pair of main surface walls 4a and 4b facing each other, a pair of side surface walls 4c and 4d facing each other and one end surface wall 4e so as to cover the frame 3. Have. In this embodiment, the cover 4
Is formed by drawing so as to integrally form the main surface walls 4a and 4b, the side surface walls 4c and 4d, and the end surface wall 4e.

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 (not shown) and a connector 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 a material such as ceramic, or may have a multilayer structure. Further, the outer surface of the 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.

The circuit board 6 and the connector 8 are the case 2
Inside, it is mainly positioned by the frame 3. In this position, the cover 4 is fixed to the frame 3 by tightening the screw 5 toward each of the side walls 4c and 4d of the cover 4. As shown in FIG. 2, the side walls 4c and 4d of the cover 4 include
A screw insertion hole 7a for penetrating the screw 5 is provided, and a screw hole 7b into which the screw 5 is screwed is provided in the frame 3 at a position corresponding to the screw insertion hole 7a.

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 the VHF circuit unit 12 and the U
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, 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 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 35, 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.

In case 2, a shield plate (not shown) for partitioning tuner circuit section 9, channel control circuit section 10 and demodulation circuit section 11 described above is arranged. Such a shield plate includes the main surface walls 4 a and 4 of the cover 4.
b and the ground land on the printed circuit board 6 are electrically connected to ensure the overall shield performance. The shield plate is attached, for example, along a partition wall provided so as to cross the main surface of the printed circuit board 6 in the frame 3. A partition 43, which is one such partition, is shown in FIG.

With respect to the structure of the cover 4, another embodiment of the present invention will be described below. In these other embodiments, the three-dimensional cover 4 is obtained by bending the metal plate instead of drawing.

In the second embodiment shown in FIGS. 4 to 6, the cover 4 is constructed by bending a metal plate 44 having a developed shape as shown in FIG. Therefore, the pair of main surface walls 4a and 4b are connected by the end surface wall 4e, and the side surface walls 4c and 4d respectively have
It has a double structure. The side walls 4c and 4d are provided with screw insertion holes 7a, and as shown in FIG. 6, the portions 44a and 44b of the metal plates 44 superposed on each of the side walls 4c and 4d are provided. An engaging protrusion 45 for engaging with each other and an engaging hole 46 for receiving the engaging protrusion 45 are provided. The engagement protrusion 45 and the engagement hole 46 engage with each other to form the metal plate 44.
This is to prevent the metal plate 44 from having an open shape again due to the spring back. Although such an engagement has an advantage that the form of the cover 4 shown in FIG. 4 is temporarily held and the screw can be more easily screwed through the screw insertion hole 7a, It does not perform any special function when screwing is completed. Therefore, if such an advantage is not desired, the engagement protrusion 45 and the engagement hole 46 may not be provided. However, as described above, the engagement protrusion 45 and the engagement hole 46 are not used merely as a temporary fixing, but when the engagement state is firmly achieved, the end surface wall 4e side of the cover 4 is screwed. May be performed. Of course, the screwing may be performed at any position on the cover 4 and the number thereof is arbitrary.

As shown by an imaginary line in FIG. 4, the cover 4 may be extended to widen the area of the frame 3 covered thereby. According to the cover 4 in the form shown by the imaginary line, it is possible to cover the portion of the frame 3 below the portion where the connector 8 is located.

Although the screw insertion hole 7a, the engaging projection 45, the engaging hole 46 and the extension shown by the imaginary line which are adopted in the above-mentioned second embodiment are not shown, FIGS. It can also be adopted in each of the embodiments shown in FIG.

A third embodiment of the present invention is shown in FIGS. 7 and 8. The cover 4 shown in FIG. 7 is configured by bending a metal plate 47 having a developed shape as shown in FIG. In the cover 4, a pair of main surface walls 4a and 4b are connected via one side surface wall 4d, and the other side surface wall 4c and a part of the main surface wall 4a have a double structure.

FIG. 9 shows a fourth embodiment of the present invention. Similar to the cover 4 shown in FIG. 4, the cover 4 shown here has a pair of main surface walls 4a and 4b connected by an end surface wall 4e, and has a double structure on both side surface walls 4c and 4d. In this embodiment, a double structure is also provided in the vicinity of each of the side walls 4c and 4d of the one main surface wall 4a.

FIG. 10 shows a fifth embodiment of the present invention. The cover 4 in this embodiment, although only partially shown, connects the pair of principal surface walls 4a and 4b and the pair of side surface walls 4c and 4d by an end surface wall 4e (not shown). The vicinity of the side walls 4c and 4d in each of the principal surface walls 4a and 4b has a double structure.

FIG. 11 shows a sixth embodiment of the present invention. Although only a part of the cover 4 in this embodiment is shown, a pair of main surface walls 4a and 4b are connected via an end surface wall 4e (not shown), like the cover 4 shown in FIG. In this embodiment, a double structure is formed in the vicinity of each of the side walls 4c and 4d on the one main surface wall 4a.

Although various examples of the mode in which the metal plate is bent to form the cover 4 are illustrated, the cover 4 can be configured in a manner other than the illustrated modes.

12 and 13 show the seventh embodiment of the present invention.
Examples of are shown. In these drawings, elements corresponding to the elements shown in FIG. 1 and FIG. 2 described above are designated by the same reference numerals, and redundant description will be omitted.

In this embodiment, the cover 4 is the upper cover 4
8 and the lower cover 49. The upper cover 48 has a main surface wall 48a, a pair of side surface walls 48b and 48c, and an end surface wall 48d. On the other hand, the lower cover 49 includes a main surface wall 49a, a side surface wall 49b, a side surface wall (not shown) opposed thereto, and an end surface wall 4
9d is formed. When the upper cover 48 and the lower cover 49 are mounted on the frame 3, as shown in FIG. 13, the side wall 48b and the side wall 49b overlap each other, and the side wall 48c and a corresponding side wall (not shown) are formed. The end surface wall 48d and the end surface wall 49d overlap each other.

As described above, in order to fix the upper cover 48 and the lower cover 49 mounted on the frame 3 to the frame 3, the screw 50 penetrates the screw insertion holes 51 and 52 provided on the side walls 48b and 49b. , Is screwed into a screwing hole 53 provided in the frame 3. In addition, a plurality of screw holes 53 are distributed around the frame 3,
Accordingly, the side walls 48b, 48c, 49b, and
If necessary, screw insertion holes 51 and 52 are provided in the end surface walls 48d and 49d.

Although not shown in FIG. 12 and FIG. 2 described above, FIG. 13 shows some electronic components 54 mounted on the printed circuit board 6.

In FIG. 12, the wall thickness around the frame 3 is made uniform, but in order to make the screw 50 screwed state in FIG. 13 stronger, the frame is provided only in the vicinity where the screw holes 53 are provided. The circumference of 3 may be thick.

Further, as shown in FIG. 12, the upper cover 48
And the side wall 48 formed on each of the lower covers 49
b, 48c, 49b and the end face walls 48d, 49d are
Although it is formed so as to extend continuously, it may be formed partially with respect to the side wall and the end wall of either the upper cover 48 or the lower cover 49.

FIG. 14 is a view corresponding to FIG. 13 showing an eighth embodiment of the present invention. 14, elements corresponding to those shown in FIG. 13 are designated by the same reference numerals,
A duplicate description will be omitted.

In the embodiment shown in FIG. 14, the upper cover 48
Is fitted into the inside of the frame 3, and the screw 50 is screwed with the frame 3 sandwiched between the upper cover 48 and the lower cover 49. In this embodiment, the upper cover 4
Since the screw 50 can be screwed into the 8 side, the screwing hole 53 provided in the frame 3 may be one in which the screw 50 is simply inserted.

As a modification of the embodiment shown in FIG. 14, the positional relationship between the upper cover 48 and the lower cover 49 with respect to the frame 3 may be reversed.

In each of the illustrated embodiments, no receiving antenna is provided, but such a receiving antenna may be externally attached or built in the card type electronic tuner.

[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 a perspective view showing a state in which the card type electronic tuner 1 shown in FIG. 1 is being assembled.

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 a cover 4 included in a second embodiment of the present invention.

5 is a metal plate 44 for obtaining the cover 4 shown in FIG.
FIG.

6 is an enlarged sectional view taken along line VI-VI in FIG.

FIG. 7 is a perspective view showing a cover 4 included in a third embodiment of the present invention.

8 is a metal plate 47 for obtaining the cover 4 shown in FIG.
FIG.

FIG. 9 is a perspective view showing a cover 4 included in a fourth embodiment of the present invention.

FIG. 10 is a cover 4 included in a fifth embodiment of the present invention.
It is a perspective view which shows some.

FIG. 11 is a cover 4 included in a sixth embodiment of the present invention.
It is a perspective view which shows some.

FIG. 12 is an exploded perspective view of a card type electronic tuner according to a seventh embodiment of the present invention.

13 is a sectional view taken along the line XIII-XIII in FIG.

FIG. 14 is a view corresponding to FIG. 13 showing an eighth embodiment of the present invention.

[Explanation of symbols]

 1 Card Type Electronic Tuner 2 Case 3 Frame 4 Cover 4a, 4b, 48a, 49a Main Surface Wall 4c, 4d, 48b, 48c, 49b Side Wall 4e, 48d, 49d End Surface Wall 5,50 Screw 6 Printed Circuit Board 8 Connector 9 Tuner Circuit part 10 Channel control circuit part 11 Demodulation circuit part 12 VHF circuit part 13 UHF circuit part 44,47 Metal plate 48 Upper cover 49 Lower cover

Claims (1)

[Claims] 1. A card-type case, a circuit board that houses a tuner circuit section, a channel control circuit section, and a demodulation circuit section that is housed in the case, and is electrically connected to the circuit board. Case 1
A connector arranged along one side, the case includes a frame for positioning the circuit board and the connector, and a cover made of a metal plate that covers the frame while exposing the connector to the outside, The cover has a pair of main surface walls facing each other,
A card-type electronic tuner having a pair of side walls and one end wall.