JP2001177424A - Tuner unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a tuner unit at a lower cost. SOLUTION: The tuner unit is provided with a printed circuit board 10 on the one side of which tuner circuit components 13, 14, 15, 16 are mounted and on the other side of which a ground pattern 18 is formed and a case frame 11 made of a metal, having 1st, 2nd and 3rd partition areas 12a, 12b, and 12c and a prescribed leg 11c and smaller than the printed circuit board 10. The leg 11c of the case frame 11 is inserted to a hole placed at a prescribed position of the printed circuit board 10 from the one side of this printed circuit board 10 and electrically connected to the ground pattern 18 of the other side, and the tuner circuit components 13, 14, and 15 on the one side are respectively placed to the 1st, 2nd and 3rd partition areas 12a, 12b, and 12c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tuner unit suitable for use in a digital tuner for receiving digital broadcasting such as satellite digital broadcasting and terrestrial digital broadcasting.

[0002]

2. Description of the Related Art As shown in FIG. 3, a tuner unit generally comprises a printed circuit board 1 and a tuner case 2 mounted so as to cover the printed circuit board 1.

The printed circuit board 1 has a predetermined tuner circuit printed and wired. The printed circuit board 1 has a plurality of electronic components 1a, 1a # mounted at predetermined positions and an external connector. Has been implemented.

The tuner case 2 is for electromagnetically shielding the printed circuit board 1 and is made of, for example, a thin iron plate, and is provided with a case frame 2a surrounding the printed circuit board 1 and a case frame 2a. Upper and lower case covers 2b made of, for example, thin iron plates that cover the upper and lower openings of
And 2c and has a box shape. In FIG. 3, 2d is a partition plate, and 3 is a high frequency signal input terminal.

[0005]

In such a conventional tuner unit, the printed circuit board 1 and the tuner case 2 are dedicated components corresponding to the respective designed tuner units. For example, in the case 2 for a tuner, each time a tuner is designed, the layout and location of the partition plate 1d necessary for the electromagnetic shield, and furthermore, the component arrangement and the size of the printed circuit board 1 differ according to the characteristics thereof. Each time a tuner is designed, it is necessary to renew the mold required for manufacturing the tuner case 2, and the production of this mold is expensive and the management cost of this production increases. There is a disadvantage that this tuner unit becomes expensive.

[0006] In view of the above, an object of the present invention is to enable a tuner unit to be manufactured at lower cost.

[0007]

A tuner unit according to the present invention comprises a printed circuit board having a tuner circuit component mounted on one surface and a ground pattern formed on the other surface, and a first, second and third printed circuit board. Having a predetermined leg and a case frame smaller than the printed circuit board. The leg of the case frame is provided at a predetermined position on the printed circuit board from one surface of the printed circuit board. And electrically connected to the ground pattern on the other surface, and the predetermined one-side tuner circuit component is located in each of the first, second and third partition areas. .

According to the present invention, the leg of the case frame is inserted from one surface of the printed circuit board into a hole provided at a predetermined position on the printed circuit board, and is electrically connected to the ground pattern on the other surface. Since the predetermined one-side tuner circuit component is located in each of the first, second and third partition areas, even if the size of the printed circuit board is different depending on the tuner design, the size of the case frame The case frame does not need to be changed, and this case frame can be used in common, so that it can be manufactured at a lower cost.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a tuner unit according to the present invention will be described below with reference to FIGS. 1 and 2 are examples in which the present invention is applied to a digital tuner for receiving digital broadcasting.

In this embodiment, as shown in FIGS. 1 and 2, a printed circuit board 10 is provided with a tuner circuit component on a portion surrounded by a case frame 11 smaller than the printed circuit board 10 and on the outside of the case frame 11. A mounting part is provided.

A predetermined circuit is printed and wired on one surface of the printed circuit board 10, and a plurality of electronic components are mounted at predetermined positions on one surface of the printed circuit board 10. in this case,
In this example, circuit components 13, 13 # of an input circuit requiring an electromagnetic shield of a digital tuner are mounted on a portion of the printed circuit board 10 corresponding to a first partition region 12a of a case frame 11, which will be described later. , This case frame 1
The circuit components 14, 14 # of the filter circuit requiring the electromagnetic shield of the digital tuner are mounted on the portion corresponding to the second partition region 12b of the first frame region 11, and the third partition region 12c of the case frame 11 is mounted. The circuit components 15 and 15 # of the direct conversion circuit requiring an electromagnetic shield are mounted on portions corresponding to the above.

Further, the circuit components 16, 16 # of the digital circuit, which do not need to be electromagnetically shielded, are mounted outside the case frame 11 on one side of the printed circuit board 10. In the figure, reference numeral 17 denotes a connector.

In the present embodiment, most of the printed circuit board 10 on the other side except for the necessary portion corresponding to the portion surrounded by the case frame 11 is formed as a ground pattern 18 by, for example, copper foil. Like so. An insulating film is formed on the ground pattern 18 except for a necessary part.

The case frame 11 forms a metal case for electromagnetic shielding. The case frame 11 is made of a metal plate, for example, a thin iron plate, and is relatively thin as a whole. Smaller,
The lower part is opened to exhibit a box shape.

In this embodiment, the case frame 11
A partition plate 11a made of two metal plates, for example, a thin iron plate
And the case frame 11 and the partition plate 11a.
And the first partition area 12 of the printed circuit board 10
a, a portion surrounded by the case frame 11 and the partition plates 11a and 11b corresponds to the second partition region 12b of the printed circuit board 10, and is surrounded by the partition plate 11b and the case frame 11. The portion corresponds to the third partition area 12c of the printed circuit board 10.

The case frame 11, the partition plate 11a
And 11b are provided with leg portions 11c, 11c # penetrating a predetermined number of printed circuit boards 10 at predetermined positions, and the case frame 11, partition plates 11a and 11 of the printed circuit board 10 are provided.
An insertion hole is formed in a portion corresponding to the leg 11c, 11c # of b. In FIGS. 1 and 2, 3a and 3b are high frequency signal input terminals.

In this embodiment, the case frame 11, the legs 11c, 11c # of the partition plates 11a and 11b are inserted into the insertion holes from one side of the printed circuit board 10, and the other side of the printed circuit board 10 is inserted. By soldering the leg 11c and the ground pattern 18, the ground pattern 1
8 and the case frame 11, the partition plates 11a and 11b are electrically connected, and the case frame 11, the partition plate 11a
And 11b are fixed to the printed circuit board 10.

In this embodiment, as described above, the ground pattern 18 is provided on the other surface side of the printed circuit board 10, and the case frame 11, the legs 11c of the partition plates 11a and 11b are electrically connected to the ground pattern 18. The circuit components 13, 13 # of the input circuit provided in the first partition area 12a of the printed circuit board 10 of the digital tuner, and the second partition area 12b
, And the circuit components 15, 15 # of the direct conversion circuit provided in the third partition region 12c can be electromagnetically shielded.

According to the present embodiment, the case frame 11, the partition plate 1
The leg portions 11a of the printed circuit board 10 are inserted into holes provided at predetermined positions of the printed circuit board 10 from one surface side of the printed circuit board 10, and are electrically connected to the ground pattern 18 on the other surface side. First partition area 1 within
2a, the circuit components 13, 13 # of the input circuit, and the second partition area 12b, the circuit components 14, 14 # of the filter circuit.
And the circuit components 15, 15 # of the direct conversion circuit are located in the third partition area 12c. Therefore, even if the size of the printed board 10 is different depending on the design of the digital tuner, this case frame It is not necessary to change the size of the case frame 11, and the case frame 11 can be used in common, and this case frame 11 can be used every time the tuner is designed.
The tuner unit does not need to be renewed, and the tuner unit can be manufactured at a lower cost.

Further, the use of the common case frame 11 reduces the number of types of the case frame 11 and facilitates production management.

In the above-described embodiment, an example in which a printed circuit board 10 for a tuner is used has been described. However, the printed circuit board of the tuner portion is included in a part of the control printed circuit board (set-side board) of the apparatus main body. Of course, the present invention can be applied to a so-called on-board system.

Further, the present invention is not limited to the above-described example, and may adopt various other configurations without departing from the gist of the present invention.

[0023]

According to the present invention, the leg of the case frame is inserted from one surface of the printed circuit board into a hole provided at a predetermined position of the printed circuit board, and is electrically connected to the ground pattern on the other surface. In addition, predetermined tuner circuit components are located in the first, second, and third partition areas, respectively. Therefore, even if the size of the printed circuit board differs depending on the tuner design, this case frame It is not necessary to change the size of this case frame, and this case frame can be used in common.There is no need to renew the mold of this case frame every time the tuner is designed, and this tuner unit can be manufactured at a lower cost. There are benefits that can be.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of an embodiment of a tuner unit of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a cross-sectional view illustrating an example of a conventional tuner unit.

[Explanation of symbols]

3a, 3b {high-frequency signal input terminal, 10} printed circuit board, 11} case frame, 11a, 11b {partition plate, 11c} leg, 12a {first partition region, 12
b ‥‥ second partition area, 12c ‥‥ third partition area, 1
3 circuit components for input circuit, 14 circuit components for filter circuit, 15 circuit components for direct conversion circuit, 16 circuit components for digital circuit, 18 ground pattern

Continued on the front page F term (reference) 5C025 AA26 BA30 DA01 DA04 5K016 AA14 BA18 BA19 DA03 EA03 EA09 EA10 GA02 HA05 HA09 5K061 AA16 BB06 JJ25

Claims (2)

[Claims] 1. A printed circuit board on which a tuner circuit component is mounted on at least one surface and a ground pattern is formed on the other surface, and a first leg, a second leg, and a third leg which are made of metal and have predetermined legs. Having a case frame body smaller than the printed circuit board, and inserting a leg of the case frame body into a hole provided at a predetermined position of the printed circuit board from one surface of the printed circuit board to form the other side of the printed circuit board. A tuner unit electrically connected to a ground pattern, and wherein the predetermined one-sided tuner circuit component is located in each of the first, second and third partition areas. 2. The tuner unit according to claim 1, wherein a component of an input circuit is provided in a first partition area of the case frame, a component of a filter circuit is provided in the second partition area, and the third component.
A tuner unit, wherein components of a direct conversion circuit are arranged in a partition area of the digital camera and digital circuit components are arranged outside the case frame.