JP2908967B2 - Tuner unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a terrestrial TV with BS,
The present invention relates to a shield structure of a tuner unit integrating a VHF / UHF / DBS tuner used for a VTR or the like.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIGS. 7A to 7C are a front view, a left side view, and a back view of a DBS tuner unit according to a conventional example, respectively, and FIGS. 8A to 8E are diagrams illustrating a VHF / UHF tuner unit according to a conventional example, respectively. Front view, left side view, right side view, top view and back view, and FIGS. 9 (a) to 9 (c) respectively show VHF / UHF / DB according to a conventional example.
It is the front view, left side view, and back view of the S integrated tuner unit.

As shown in FIGS. 7 and 8, a conventional DBS tuner built-in TV, VTR and the like have a chassis in which a DBS tuner circuit section (FIG. 7) and a VHF / UHF tuner circuit section (FIG. 8) are independent from each other. It was a unit configuration housed in

In FIG. 7, a DBS tuner unit 2
Reference numeral 0 denotes a configuration in which a circuit board (not shown) is covered by a front cover 21 and a back cover 22 from the front and back. In the figure, 23 is an input terminal,
24 is an external connection terminal.

[0005] Also in FIG. 8, the VHF / UHF tuner unit 25 covers a circuit board (not shown) from the front and back with a front cover 26 and a back cover 27, similarly to FIG. 7.
In the figure, 28 is an input terminal, and 29 is an external connection terminal.

[0006] In the conventional example shown in FIGS.
Whereas the S tuner and the VHF / UHF tuner are configured as independent separate chassis, the conventional example of FIG. 9 is such that both tuners are integrated. V according to the conventional example of FIG.
In the HF / UHF / DBS integrated tuner unit 30, the VHF / UHF tuner section and the DBS tuner section are formed on a single printed circuit board, and the printed circuit board is housed in one chassis. In the figure, 31 and 32 are front and rear shield lids, and 33 and 34.
Is a VHF / UHF tuner input terminal and a DBS tuner input terminal, and 35 is a terminal for external connection.

[0007]

As shown in FIGS. 7 and 8, the VHF / UHF tuner section and the D
When the BS tuner section and the BS tuner section are housed in independent chassis, interference due to mutual interference hardly occurs, but since there are two units, TV and V
At the time of mounting on a TR or the like, there is a problem that a large space is taken and the miniaturization of the set is hindered.

On the other hand, VHF / UHF / DBS shown in FIG.
In the case of an integrated tuner unit, both tuners are housed in one unit, so that the overall size is compact, which can contribute to downsizing of a set. Interference occurs between the power supply and the DBS tuner. Normally, a shield wall vertically formed on a printed circuit board is provided between the two tuners. However, this is not sufficient, so that VHF / UH
There is a problem that the F tuner unit and the DBS tuner unit cannot be operated independently (simultaneously).

An object of the present invention is to provide a tuner unit which can prevent mutual interference between the two tuners and can simultaneously operate both tuners in a VHF / UHF / DBS integrated tuner unit which can contribute to downsizing of the set. It is in.

[0010]

In order to achieve the above-mentioned object, the present invention provides a substantially rectangular printed circuit board on a single printed circuit board.
A VHF / UHF tuner circuit section arranged in the shape area , and a substantially long section in which the VHF / UHF tuner circuit section is arranged
A substantially L-shaped area located on the outer periphery of two sides of the rectangular area
Spaced apart a DBS tuner circuit portion disposed band, the chassis angle provided in the vertical direction before the front and back of Kipu lint substrate, spaced portions of the formation of a substantially L-shaped
And each of the two circuit portions is separated from each other so as to separate each of the two circuit portions, and each of the two circuit portions surrounded by the chassis angle is covered by a separate shield lid corresponding to the two circuit portions on the front and back of the printed circuit board. Ri greens and the VHF / UHF tuner circuit portion arrangement
The two sides of the outer peripheral short side of the substantially rectangular area
Arrange the input terminals for each tuner connected to the circuit section,
Substantially rectangular in which the VHF / UHF tuner circuit is arranged
Connected to the two circuit portions on the side surface on the long side of the outer periphery of the shape region.
And a plurality of input / output terminals for external connection .

[0011]

The chassis angle surrounding the VHF / UHF tuner circuit section and the chassis angle surrounding the DBS tuner circuit section are made independent, and the lids covering the tuner sections are made independent from each other. However, mutual interference can be suppressed to a very small level, and the problem that both tuners cannot be operated at the same time as in the related art can be solved.

Also, since the printed circuit board is a single plate and the chassis is one for the single substrate, the overall size can be made compact and the assembly can be simplified. Furthermore, since the shape of the printed circuit board is a simple rectangle, the number of boards to be formed at the time of producing the printed circuit board can be effectively taken.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows VHF / UH according to the present embodiment.
FIGS. 2 to 6 show the front view, the left side view, the right side view, the top view, and the back view of the F / DBS integrated tuner unit before the lid is attached, and FIGS. .

The feature of this embodiment is that the circuits of the VHF / UHF tuner section and the DBS tuner section are formed on a single printed circuit board, and these two circuits are respectively covered by independent chassis angles and shield lids. is there.

A description will be given below with reference to the drawings. As shown in FIG. 1, the tuner unit according to the present embodiment has no VHF / UHF tuner unit 2, DBS tuner unit 3, and components between the two tuner units mounted on a single printed circuit board 1. A separation section 4 is provided.
The outer periphery of the printed circuit board 1 is surrounded by a main chassis angle 5. The VHF / UHF tuner unit 2 and the separation unit 4 and the DBS tuner unit and the separation unit 4 are separated by chassis angles 6 and 7 erected in the printed circuit board 1 in a vertical direction.

Further, the separating portion 4 has a chassis angle 6,
A plurality of other short chassis angles 8 are provided in order to improve the integration and mechanical strength of the chassis 7, and the chassis angles 8 are connected to the ground.

Further, the two tuner units 2 and 3 are divided into a plurality of parts by different chassis angles 9 and 10, respectively. These chassis angles 9 and 10 are for electrically separating each circuit portion of each tuner section. In the figure, reference numerals 11 and 12 denote input terminals for a VHF / UHF tuner, input terminals for a DBS tuner , and 13 an input / output terminal for external connection.

Next, as shown in FIGS. 2 to 6, a shield lid is attached to the tuner unit. At this time, the VHF / UHF tuner unit 2 and the DBS tuner unit 3 are each separated by a separate shield lid. Cover. That is, the VHF / UHF tuner unit 2 is covered by the front shield cover 14 and the back shield cover 15, and the DBS tuner unit 3 is covered by the front shield cover 16 and the back shield cover 17.

Here, FIG. 2 shows the shield lid viewed from one side, but the same applies to the shape viewed from the other side. In addition, the substrate surface of the printed circuit board 1 is exposed as it is without being covered by the shield lid with respect to the separation portion 4.

As described above, in this embodiment, VH
Since the angle surrounding the F / UHF tuner section 2 and the angle surrounding the DBS tuner section 3 are separate, and the shield lids covering the respective tuner sections are separate from each other, the two tuner sections are separated via the separation section 4. Are independent of each other. As described above, the present embodiment does not shield with a single shield wall erected alone on a printed circuit board as in the related art, but can reliably ensure isolation between the two, and each tuner section Are operated at the same time, mutual interference can be suppressed to a very small level, and the problem that both tuners cannot be operated at the same time as in the related art can be solved.

Further, since the printed board is a single board, and the chassis angle can be integrated with the single board, the overall size can be made compact and the assembly can be simplified. Furthermore, since the shape of the printed circuit board is a simple rectangle, the number of boards to be formed at the time of producing the printed circuit board can be effectively taken.

[0022]

As described above, according to the present invention, the VHF / UHF / D which can be compactly arranged as a whole.
In the BS integrated tuner unit, VHF / UHF
Mutual interference between the tuner section and the DBS tuner section can be kept extremely small, and both tuner sections can be operated simultaneously.

[Brief description of the drawings]

FIG. 1 shows a VHF / UHF / DB according to an embodiment of the present invention.
FIG. 4 is a front view of the S-integrated tuner unit before a shield lid is attached.

FIG. 2 shows VHF / UHF / DB according to an embodiment of the present invention.
It is a front view after attaching a shield lid of an S integrated tuner unit.

FIG. 3 shows VHF / UHF / DB according to an embodiment of the present invention.
FIG. 5 is a left side view of the S-integrated tuner unit after the shield lid is attached.

FIG. 4 shows VHF / UHF / DB according to an embodiment of the present invention.
FIG. 4 is a right side view of the S-integrated tuner unit after a shield lid is attached.

FIG. 5 shows VHF / UHF / DB according to an embodiment of the present invention.
FIG. 6 is a top view of the S-integrated tuner unit after the shield lid is attached.

FIG. 6 shows VHF / UHF / DB according to an embodiment of the present invention.
FIG. 7 is a rear view of the S-integrated tuner unit after the shield lid is attached.

FIGS. 7A to 7C each show a D according to a conventional example.
It is the front view, left side view, and top view of a BS tuner unit.

8 (a) to 8 (e) respectively show V in the conventional example.
It is a front view, a left side view, a right side view, a top view, and a back view of the HF / UHF tuner unit.

FIGS. 9 (a) to 9 (c) each show a conventional V
It is the front view, left side view, and top view of the HF / UHF / DBS integrated tuner unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printed circuit board 2 VHF / UHF tuner circuit part 3 DBS tuner circuit part 4 Separation part 5, 6, 7 Chassis angle 14, 16 Front shield lid 15, 17 Back shield lid

Claims (1)

(57) [Claims] 1. A substantially long printed circuit board on a single board
A VHF / UHF tuner circuit section arranged in a rectangular area and a substantially long section in which the VHF / UHF tuner circuit section is arranged
A substantially L-shaped area located on the outer periphery of two sides of the rectangular area
Spaced apart a DBS tuner circuit portion disposed band, before the chassis angle provided in the vertical direction on the front and back of the Kipu lint substrate, spaced portions of the substantially L-shaped is formed
While enclosing each of the two circuit portions separately, covering each of the two circuit portions surrounded by the chassis angle with a separate shield lid corresponding to the two circuit portions on the front and back of the printed circuit board. <br/>-than, substantially rectangular to the VHF / UHF tuner circuit portion is arranged
Connected to the two circuit parts on the side of the outer peripheral short side of the shape area
Input terminals for each tuner are arranged, and the VHF / UHF tuner circuit section is disposed in a substantially rectangular shape.
Connected to the two circuit portions on the side of the outer peripheral long side of the shape area
Multiple input / output terminals for external connection
Tuner unit, characterized in that that.