JP4016692B2 - Shield case, shield case reel and high frequency circuit device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shield case, a shield case reel, and a high-frequency circuit device that shield a high-frequency circuit corresponding to a wireless communication technology such as Bluetooth.
[0002]
[Prior art]
In recent years, wireless communication technology such as Bluetooth has been adopted in many electronic devices. Bluetooth is short-range wireless communication using a 2.4 GHz band radio wave standardized by Ericsson (Sweden). In Bluetooth, the maximum transfer rate is 1 Mbit / sec, and a GFSK (Gaussian Frequency Shift Keying) modulation method is used. The maximum transmission distance is 10 m (output: 1 mW) and 100 m (output: 100 mW), which can be selected depending on the application.
[0003]
In an electronic device employing Bluetooth, a high-frequency circuit is shielded by a shield case in order to suppress electromagnetic interference. Here, a conventional high-frequency circuit device is shown in FIG. FIG. 4A is a plan view of the high-frequency circuit device, and FIG. 4B is a side view of the high-frequency circuit device. As shown in FIG. 4, the high-frequency circuit device includes a high-frequency circuit chip 11 that includes a high-frequency circuit, and a shield case 12 that covers the circuit surface of the high-frequency circuit chip 11. The high-frequency circuit chip 11 and the shield case 12 are soldered with solder 13. A window portion 14 is formed on the side surface of the shield case 12 for the reason described later.
[0004]
As shown in FIG. 5, the shield case 12 is stored in a reel state. In the shield case reel 15 shown in FIG. 5, a plurality of shield cases 12 are arranged in a matrix, and each shield case 12 has a frame body of the shield case reel 15 via a connecting portion 16 in the middle part of the side surface. 17 is connected.
[0005]
[Problems to be solved by the invention]
Since the shield case reel 15 is formed by punching, in order to secure the connecting portion 16 that connects the shield case 12 and the frame body 17, a part of the member corresponding to the side surface of the shield case 12 is connected. It must be used as part 16. The shield case 12 is separated from the shield case reel 15 by cutting the connecting portion 16. For this reason, as shown in FIG. 4, a part of the side wall is missing on the side surface of the shield case 12, and the window portion 14 is formed. Such a window portion 14 is a factor that reduces the shielding effect of the shielding case 12. Further, as shown in FIG. 5, the shield case 12 is connected to the frame 17 of the shield case reel 15 by three connecting portions 16. In such a structure, the corner of the shield case 12 is lifted. There is also a problem that deformation such as the above is likely to occur.
[0006]
The present invention has been made in view of the above-described problems, and an object thereof is to provide a shield case, a shield case reel, and a high-frequency circuit device that can improve the shielding effect.
[0007]
[Means for Solving the Problems]
In order to achieve the above-described object, a shield case according to the present invention includes a shield case covering a high-frequency circuit chip, a rectangular-shaped shield case base covering the circuit surface of the high-frequency circuit chip, and four sides of the shield case base. Each side wall portion being bent at right angles to the high-frequency circuit chip side, and a claw portion protruding from both ends in the longitudinal direction of each side wall portion and folded into the adjacent side wall portion side. The claw portion is folded at the corner portion of the shield case base with the claw portion of the adjacent side wall portion being brought into contact with each other so as to form a soldering region with the upper surface of the high frequency circuit chip.
Further, a shield case according to the present invention is a shield case that covers a rectangular plate-shaped high-frequency circuit chip in a plan view, and is a rectangular-shaped shield case base that covers the circuit surface of the high-frequency circuit chip, and the shield case base Side walls that are integrally provided on the four sides and bent at right angles to the high-frequency circuit chip side, and claw portions that protrude from both longitudinal ends of the side walls and are folded into adjacent side walls. The claw portion is folded with the claw portions of the adjacent side wall portions and the tip portions of the side walls abutting each other, and when the high-frequency circuit chip is covered, the upper surface of the corner portion of the high-frequency circuit chip is exposed, It is formed so as to be soldered to the upper surface of the corner portion.
In these shield cases, the side wall portion continuously covers the side surface and the window portion is not formed, so that the shielding effect is enhanced. Further, since the soldering is performed at each corner with the high-frequency circuit chip, a large component mounting area can be secured.
[0008]
In order to achieve the above object, a shield case reel according to the present invention is a shield case reel in which a plurality of shield cases are connected to a frame and arranged in a matrix. A rectangular shield case base, a side wall portion integrally connected to the four sides of the shield case base, bent at right angles to the high-frequency circuit chip side, and protruded from both ends in the longitudinal direction of each side wall portion. And a claw portion folded on the side of the side wall portion, and is connected to the frame body via each corner portion of the shield case base. Since the shield case is connected to the frame of the shield case reel via each corner, deformation such as lifting does not occur.
[0009]
Further, in order to achieve the above object, the high-frequency circuit device according to the present invention is a high-frequency circuit device comprising: a high frequency circuit chip, and a shield case of the structure covering the circuit surface of the high frequency circuit chip. Therefore, a large mounting area can be secured by soldering the shield case and the high-frequency circuit chip at the four corners.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a shield case, a shield case reel, and a high-frequency circuit device according to the present invention will be described in detail with reference to the drawings.
[0011]
A high-frequency circuit device to which the present invention is applied is shown in FIG. FIG. 1A is a plan view of the high-frequency circuit device, and FIG. 1B is a side view of the high-frequency circuit device. As shown in FIG. 1, the high-frequency circuit device includes a high-frequency circuit chip 1 including a high-frequency circuit corresponding to a high-frequency technology such as Bluetooth, and a shield case 2 that covers a circuit surface of the high-frequency circuit chip 1. The high frequency circuit chip 1 and the shield case 2 are connected by solder 3 at four corners.
[0012]
FIG. 2 is a diagram showing in detail the corner portion of the shield case 2. FIG. 2A is a development view of the corner portion of the shield case 2, and FIG. 2B is an assembly view of the corner portion of the shield case 2. As shown in FIG. 2, the shield case 2 is integrally connected to a substantially rectangular shield case base 2a covering the circuit surface of the high-frequency circuit chip 1 and four sides of the shield case base 2a. Side wall portions 2b bent at right angles to each other, and claw portions 2c protruding from both ends in the longitudinal direction of the respective side wall portions and folded to the adjacent side wall portion 2b side. The claw portions 2c protruding from the adjacent side wall portions 2b are folded in this way, so that the tip portions of each other are abutted.
[0013]
In this shield case 2, since the side wall 2b covers the side without interruption, and the conventional window is not formed on the side, the high-frequency shielding effect can be enhanced. Moreover, since the shield case 2 and the high-frequency circuit chip 1 are soldered at each corner, a large component mounting area can be secured.
[0014]
As shown in FIG. 3, the shield case 2 can be stored in a reel state. In the shield case reel 4 shown in FIG. 3, a plurality of shield cases 2 are arranged in a matrix, and each shield case 2 is connected to a frame body 6 via a connecting portion 5 connected to four corner portions. It is connected to. Thus, since the shield case 2 can be stored in a reel state, it is easy to manage. Moreover, since each shield case 2 is connected to the frame body 6 via the connecting portion 5 at the four corner portions, deformation such as lifting does not occur.
[0015]
【The invention's effect】
As described above, the shield case according to the present invention is integrally provided on the four sides of the shield case base, which is rectangular in plan view, covering the circuit surface of the high-frequency circuit chip, and is respectively provided on the high-frequency circuit chip side. A side wall portion bent at a right angle, and a claw portion projecting at both ends in the longitudinal direction of each side wall portion and folded into the adjacent side wall portion side, and the claw portion is provided at a corner portion of the shield case base. Since the nail portions of the adjacent side wall portions are folded together with the tip portions thereof so as to form a soldering region with the upper surface of the high-frequency circuit chip, a window portion is not formed and a good shielding effect is realized. Can do. Further, since the soldering is performed at each corner with the high-frequency circuit chip, a large component mounting area can be secured.
[0016]
Further, the shield case reel according to the present invention is a shield case reel in which a plurality of shield cases are connected to a frame body and arranged in a matrix, and the shield case is connected to the frame body via each corner of the shield case base. Therefore, it is possible to provide a shield case reel that is easy to manage without causing deformation such as lifting.
[0017]
The high frequency circuit device according to the present invention, a high frequency circuit chip, than Ru and a shield case of the structure covering the circuit surface of the high frequency circuit chip, it is possible to secure a wide component mounting area.
[Brief description of the drawings]
FIG. 1 is a plan view and a side view of a high-frequency circuit device to which the present invention is applied.
FIG. 2 is an enlarged view of a corner portion of a shield case to which the present invention is applied.
FIG. 3 is a plan view of a shield case reel to which the present invention is applied.
FIG. 4 is a plan view and a side view of a conventional high-frequency circuit device.
FIG. 5 is a plan view of a conventional shield case reel.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 High frequency circuit chip 2 Shield case 2a Shield case base | substrate 2b Side wall part 2c Claw part 3 Solder

Claims (4)

In the shield case that covers the high-frequency circuit chip,
A shield case base having a rectangular shape in plan view covering the circuit surface of the high-frequency circuit chip;
Side walls that are integrally connected to the four sides of the shield case base and are bent at right angles to the high-frequency circuit chip side,
Projecting at both ends in the longitudinal direction of each of the side wall parts, and claw parts folded into adjacent side wall parts,
The claw portion is folded at the corner portion of the shield case base so that the claw portion of the adjacent side wall portion and the tip end portion are attached to each other so as to form a soldering region with the upper surface of the high-frequency circuit chip. Shield case. In a shield case that covers a rectangular plate-shaped high-frequency circuit chip in plan view,
A shield case base having a rectangular shape in plan view covering the circuit surface of the high-frequency circuit chip;
Side walls that are integrally connected to the four sides of the shield case base and are bent at right angles to the high-frequency circuit chip side,
Projecting at both ends in the longitudinal direction of each of the side wall parts, and claw parts folded into adjacent side wall parts,
The claw portion is folded so that the claw portions of the adjacent side wall portions and the tip portions of the side walls face each other, and when the high frequency circuit chip is covered, the corner portion upper surface of the high frequency circuit chip is exposed, and the corner portion A shield case formed so as to be soldered to an upper surface. In a shield case reel in which a plurality of shield cases are connected to a frame and arranged in a matrix,
The shield case has a rectangular shield case base in plan view, and
Side walls that are integrally connected to the four sides of the shield case base and are bent at right angles to the high-frequency circuit chip side,
Projecting at both ends in the longitudinal direction of each of the side wall parts, and claw parts folded into adjacent side wall parts,
A shield case reel connected to the frame body via each corner of the shield case base.   A high-frequency circuit device comprising: a high-frequency circuit chip; and the shield case according to claim 1 that covers a circuit surface of the high-frequency circuit chip.

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