JP2003298272A - Shield case, shield case reel and high frequency circuit device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To improve the shielding effect of a shield case. SOLUTION: A substantially rectangular shield case base 2a for covering a circuit surface of a high-frequency circuit chip 1 and side walls integrally connected to four sides of the shield case base 2a and respectively bent at right angles to the high-frequency circuit chip 1 side. 2b, and claw portions 2c protruding from both ends in the longitudinal direction of each side wall portion 2b and being folded into adjacent side wall portions.
The side wall continuously covers the side surface so that the window is not formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield case, a shield case reel and a high frequency circuit device for shielding a high frequency circuit compatible with a wireless communication technology such as Bluetooth.

[0002]

2. Description of the Related Art In recent years, wireless communication technology such as Bluetooth has been adopted in many electronic devices. Bluetooth is short-range wireless communication that uses electric waves in the 2.4 GHz band standardized by Ericsson (Sweden). With Bluetooth, the maximum transfer rate is 1 Mbit / sec, and GFSK (Gaus
sian Frequency Shift Keying) modulation method is used. The maximum transmission distance is 10m (output: 1m
W) and 100 m (output: 100 mW), which can be selected according to the application.

In electronic equipment using 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, this high frequency circuit device includes a high frequency circuit chip 11 including a high frequency circuit, and a shield case 12 that covers a circuit surface of the high frequency circuit chip 11. The high frequency circuit chip 11 and the shield case 12 are soldered with the solder 13. A window portion 14 is formed on the side surface of the shield case 12 for the reason described below.

The shield case 12 is stored in a reel state as shown in FIG. In the shield case reel 15 shown in FIG. 5, a plurality of shield cases 12 are provided.
Are arranged in a matrix, and each shield case 12 is
It is connected to the frame body 17 of the shield case reel 15 via the connecting portion 16 in the middle of the side surface.

[0005]

Since the shield case reel 15 is formed by punching, the side surface of the shield case 12 must be secured in order to secure the connecting portion 16 for connecting the shield case 12 and the frame body 17. There is no choice but to use a part of the member corresponding to as the connecting portion 16. The shield case 12 is separated from the shield case reel 15 by cutting the connecting portion 16. Therefore, on the side surface of the shield case 12, as shown in FIG. 4, a part of the side wall is missing and the window portion 14 is formed. Such a window portion 14 is a factor that reduces the shielding effect of the shield case 12. Further, the shield case 12 has three connecting portions 16 as shown in FIG.
Is connected to the frame body 17 of the shield case reel 15 by such a structure.
There was also a problem that deformation such as rising of the corners is likely to occur.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a shield case, a shield case reel, and a high-frequency circuit device capable of improving the shield effect.

[0007]

In order to achieve the above object, a shield case according to the present invention is a shield case for covering a high frequency circuit chip, wherein the shield case has a substantially rectangular shape and covers a circuit surface of the high frequency circuit chip. A substrate,
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, respectively, and project from both longitudinal ends of each side wall, and are folded into the side walls adjacent to each other. And a claw portion. In this shield case, since the side wall portion continuously covers the side surface and the window portion is not formed, the shield effect is enhanced.

In order to achieve the above-mentioned object, 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. A rectangular shield case base, side walls integrally connected to the four sides of the shield case base and bent at right angles to the high-frequency circuit chip side, and projecting at both ends in the longitudinal direction of each side wall and adjacent to each other. The shield case base is connected to the frame body through each corner of the shield case base. Since the shield case is connected to the frame body of the shield case reel via each corner, deformation such as floating does not occur.

In order to achieve the above-mentioned object, a high frequency circuit device according to the present invention includes a high frequency circuit chip, a substantially rectangular shield case base covering a circuit surface of the high frequency circuit chip, and four sides of the shield case base. It is serially integrated with
A high-frequency circuit, comprising: a side wall part that is bent at a right angle to the high-frequency circuit chip side; and a shield case that includes claw parts that project from both ends of each side wall part in the longitudinal direction and that are folded into the adjacent side wall part side. The chip and the shield case are soldered at the corners formed by abutting the claws. By soldering the shield case and the high-frequency circuit chip at the four corners, a large component mounting area can be secured.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A shield case, a shield case reel, and a high-frequency circuit device according to the present invention will be described below in detail with reference to the drawings.

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,
FIG. 1B is a side view of the high frequency circuit device. As shown in FIG. 1, this high-frequency circuit device includes a high-frequency circuit chip 1 including a high-frequency circuit compatible with a high-frequency technology such as Bluetooth, and a shield case 2 that covers the 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.

FIG. 2 is a diagram showing the corner portion of the shield case 2 in detail. 2A is a development view of a 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 body 2a that covers the circuit surface of the high frequency circuit chip 1 and four sides of the shield case base body 2a. A side wall portion 2b bent at a right angle to
Each side wall portion is provided with a claw portion 2c protruding from both ends in the longitudinal direction and folded to the side wall portion 2b adjacent to each other. The claw portions 2c projecting from the adjacent side wall portions 2b are folded in this way so that the tips of the claw portions 2c abut each other.

In this shield case 2, the side wall portion 2b covers the side surface without interruption, and the conventional window portion is not formed on the side surface, so that the high frequency shielding effect can be enhanced. Further, 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.

The shield case 2 can be stored in a reel state as shown in FIG. 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 the frame body 6 via connecting portions 5 connected to four corner portions. Are linked to. In this way, the shield case 2 can be stored in a reel state, so that it is easy to manage.
Further, since each shield case 2 is connected to the frame body 6 via the connecting portions 5 at the four corner portions, deformation such as floating does not occur.

[0015]

As described above, the shield case according to the present invention is provided with a substantially rectangular shield case base that covers the circuit surface of the high-frequency circuit chip and the four sides of the shield case base that are integrally connected to each other. Since the side wall portion bent at a right angle to the circuit chip side and the claw portion protruding from both longitudinal ends of each side wall portion and folded into the adjacent side wall portion side are provided, a window portion is not formed, which is good. It is possible to realize a good shield effect.

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, wherein the shield case is provided through each corner of the shield case base. Since it is connected to the frame body, it is possible to provide a shield case reel that is easy to manage without causing deformation such as lifting.

The high-frequency circuit device according to the present invention includes a high-frequency circuit chip, a substantially rectangular shield case base that covers the circuit surface of the high-frequency circuit chip, and four sides of the shield case base that are integrally connected to each other. A high-frequency circuit chip, comprising: a side wall part bent at a right angle to the circuit chip side; and a shield case provided at both ends in the longitudinal direction of each side wall part and projecting from the side wall part, and a claw part folded into an adjacent side wall part side. Since the shield case is soldered at the corners formed by the butting of the claws, a large component mounting area can be secured.

[Brief description of 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 has been applied.

FIG. 3 is a plan view of a shield case reel to which the present invention has been 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] 1 High frequency circuit chip 2 shield case 2a Shield case base 2b Side wall 2c claw 3 Solder

Claims (3)

[Claims] 1. A shield case for covering a high-frequency circuit chip, wherein a substantially rectangular shield case base covering a circuit surface of the high-frequency circuit chip and four sides of the shield case base are integrally connected to each other, and each of the high-frequency circuits is connected to the shield case base. A shield case comprising side walls bent at a right angle to the chip side, and claws projecting from both ends of each side wall in the longitudinal direction and folded into adjacent side walls. 2. A shield case reel in which a plurality of shield cases are connected to a frame body and arranged in a matrix, wherein the shield case is integrally formed on a substantially rectangular shield case base and four sides of the shield case base. It is a series of
Each of the shield case base includes a side wall part bent at a right angle to the high-frequency circuit chip side, and claw parts protruding from both ends of each side wall part in the longitudinal direction and folded into adjacent side wall part sides. A shield case reel, characterized in that the reel is connected to the frame through each corner. 3. A high-frequency circuit chip, a substantially rectangular shield case base that covers the circuit surface of the high-frequency circuit chip, and four continuous sides of the shield case base that are integrally connected to each other at right angles to the high-frequency circuit chip side. A side wall portion that is bent, and a shield case that is provided at both ends of each side wall portion in the longitudinal direction so as to project, and a claw portion that is folded into the side wall portion adjacent to the side wall portion. A high-frequency circuit device, characterized in that the claws are soldered at the corners formed by butting.