JP4304801B2 - High frequency equipment case - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a case of a high-frequency device such as a tuner unit including, for example, an input circuit of a television receiver, a high-frequency amplifier circuit, and a frequency conversion circuit.
[0002]
[Prior art]
In general, a high-frequency device of a tuner unit including an input circuit, a high-frequency amplifier circuit, and a frequency conversion circuit of a television receiver is covered with a metal case made of, for example, a tin plate for electromagnetic shielding.
[0003]
As shown in FIGS. 4 and 5, this conventional tuner metal case has a rectangular box-like frame 2 surrounding a wiring board 1 on which high-frequency components of an input circuit, a high-frequency amplifier circuit and a frequency conversion circuit are mounted. The upper and lower case covers 2a and 2b, for example, a tin plate, which cover the upper and lower openings of the frame 2 are formed.
[0004]
As shown in FIG. 5, a partition plate 3 made of a predetermined metal plate such as a tin plate is provided in the frame 2 of the metal case, and a predetermined number of contact portions 3a are provided at predetermined positions of the partition plate 3, and the upper case cover A claw 4 having a slender tip formed as a free end is formed by cutting at a position corresponding to the contact portion 3a of the partition plate 3 at 2a. The tip of the claw 4 is formed at the contact portion 3a of the partition plate 3. In order to obtain a predetermined high-frequency characteristic (shielding effect), the contact is made electrically and mechanically.
[0005]
[Problems to be solved by the invention]
However, in recent years, the density of high-frequency components mounted on the wiring board 1 has increased, and when a high-frequency component requiring space is used, there is no space for arranging the partition plate 3 as necessary. There is a problem that the claws 4 of the covers 2a and 2b cannot be brought into contact with each other, and stable high frequency characteristics (shielding effect) cannot be obtained.
[0006]
The present invention has been made in view of these points, and an object thereof is to obtain higher high-frequency characteristics (shielding effect).
[0007]
The case of the high frequency device of the present invention includes a case cover having a helical claw provided at a position corresponding to the adjustment coil in the case of the high frequency device in which the wiring board on which the high frequency component is mounted is disposed in the metal case. The claws are brought into contact with the exterior , which is the grounding point of the adjustment coil mounted on the wiring board, and the adjustment coil can be adjusted from the outside .
[0008]
According to the present invention, since the claws of the case cover are brought into contact with the exterior , which is the grounding point of the adjustment coil , higher frequency characteristics (shielding effect) can be obtained.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, examples of embodiments of the case of the high-frequency device of the present invention will be described with reference to FIGS. In this example, the present invention is applied to a case of a high-frequency device of a tuner unit composed of an input circuit of a television receiver, a high-frequency amplifier circuit, and a frequency conversion circuit.
[0010]
In this example, as shown in FIGS. 1 to 3, a rectangular plate made of a metal plate such as a tin plate surrounding the wiring board 10 on which the high frequency components 10a, 10b,... The box-shaped frame 11 and upper and lower case covers 11a and 11b made of, for example, a tin plate covering the upper and lower openings of the rectangular box-shaped frame 11 are formed.
[0011]
The frame 11 is a rectangular box-shaped frame having a width of 49 mm, a length of 127 mm, and a thickness of 9 mm, for example. As shown in FIG. 3, a partition plate made of a predetermined metal plate such as a tin plate is provided in the frame 11. 12 and a predetermined number of contact portions 12a are provided at predetermined positions of the partition plate 12, and a long and slender tip is formed as a free end by cutting into a position corresponding to the contact portion 12a of the partition plate 12 of the upper case cover 11a. The nail | claw 13 is formed, the front-end | tip of this nail | claw 13 is contact | abutted to the contact part 12a of this partition plate 12, and it connects electrically and mechanically so that a high frequency characteristic (shielding effect) will be acquired.
[0012]
Further, the upper and lower case covers 11a and 11b are configured to sandwich and contact the frame body 11 by their outer peripheral portions to ensure high frequency characteristics (shielding effect).
[0013]
The area 12b partitioned by the partition plate 12 in FIG. 3 has a high density of the high-frequency components 10a and 10b to be mounted, and the high-frequency components 10a and the like that require space are arranged, and a partition plate is required. There is no space to just arrange.
[0014]
Therefore, in this example, the upper case cover 11a is cut by 2 as shown in FIG. 2B at a position corresponding to the high-frequency component mounted on the wiring board 10, for example, directly above the adjustment coil 10a whose exterior is the ground point. Helical claws 14a and 14b having two free ends are formed, and the tips of the helical claws 14a and 14b are brought into contact with the exterior of the adjustment coil 10a as shown in FIG. To make a connection.
[0015]
In this case, a cut is made so that a circular hole is formed at the center of the free ends of the two helical claws 14a and 14b as shown in FIG. The adjustment coil 10a can be adjusted. Others are configured in the same manner as in the prior art.
[0016]
In this example, since the claws 14a and 14b of the upper case cover 11a are in direct contact with the exterior of the adjustment coil 10a, which is the grounding point of the high frequency component, as described above, higher frequency characteristics (shielding effect) can be obtained. .
[0017]
In this example, the claws 14a and 14b are formed in a spiral shape, so that the strokes of the claws 14a and 14b can be lengthened and an appropriate spring pressure can be ensured, for example, the influence on the mounted high-frequency components can be reduced. . For example, when the helical claws 14a and 14b are brought into contact with the exterior of the adjustment coil 10a having a height of 7 mm, the spring pressure applied to the adjustment coil 10a is 50 g with respect to the 1 mm deflection of the claws 14a and 14b. It was about.
[0018]
In the above example, the spiral claws 14a and 14b provided on the upper case cover 11a are brought into contact with the exterior of the adjustment coil 10a, which is the grounding point of the high-frequency component, but the claws 14a and 14b are connected to the wiring board 10. You may make it contact | abut directly on a point. In this case, it can be easily understood that the same effect as the above-described example can be obtained.
[0019]
Further, the present invention is not limited to the above-described examples, and various other configurations can be adopted without departing from the gist of the present invention.
[0020]
【The invention's effect】
According to the present invention, since the nail of the case cover is brought into contact with the ground point of the high frequency component or the wiring board, higher frequency characteristics (shielding effect) can be obtained.
[0021]
In the present invention, when the shape of the claw is a spiral shape, the stroke of the claw can be lengthened and an appropriate spring pressure can be secured.
[0022]
Further, in the present invention, when the claw is formed in two spiral shapes and the tip of the claw is brought into contact with the exterior of the adjustment coil or the like, the adjustment coil or the like can be adjusted while keeping the case cover from the outside. it can.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of an embodiment of a case of a high-frequency device according to the present invention.
2 is an enlarged view of a main part of the example of FIG. 1, wherein A is a cross-sectional view and B is a plan view.
3 is a plan view showing a state where the upper case cover is removed from the example of FIG. 1; FIG.
FIG. 4 is a perspective view showing an example of a case of a conventional high-frequency device.
5 is a perspective view showing a state where the upper case cover of FIG. 4 is removed. FIG.
[Explanation of symbols]
10. Wiring board, 10a ... Adjustment coil, 10b ... High frequency component, 11 ... Frame, 11a ... Upper case cover, 11b ... Lower case cover, 12 ... Partition plate, 12a ... Contact part, 13 ... nail, 14a, 14b ... spiral nail

Claims (2)

In the case of a high-frequency device in which a wiring board on which high-frequency components are mounted is placed in a metal case,
A case cover having a helical claw provided at a position corresponding to the adjustment coil ;
A case of a high-frequency device, characterized in that the adjustment coil is adjustable from the outside while the claw is brought into contact with an exterior which is a ground point of the adjustment coil mounted on the wiring board . In the case of the high frequency device according to claim 1,
The case cover has a plurality of the claws ,
Case of the high-frequency device characterized by causing contact a plurality of the claws on the exterior is a ground point of the adjustment coil.

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