JPH0425199A - Case structure of radio device - Google Patents

Abstract

PURPOSE:To enable a required part to be shielded without soldering a shield case to a printed board and to improve an assembly operation in efficiency by a method wherein the required part of the printed board is electromagnetically shielded with the shield wall of a case. CONSTITUTION:A shield wall 7 is provided to a case 6 in one piece standing vertically from the base of the case 6, an earth pattern 8 formed on a printed board 5 through printing is provided surrounding a microstrip line 3, and the earth pattern 8 and the shield wall 7 provided to the case 6 are electrically connected together by fastening the printed board 5 and the case 6 to each other with screws which penetrate the printed board 5. By this setup, the microstrip line 3 is surely and electrically shielded from an input terminal la of a transmission filter 1 and an output terminal 2b of a receiving filter 2.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a housing structure of a wireless device.

[Conventional technology]

The housing structure of a conventional wireless device will be explained with reference to FIG.

A receiving filter input terminal 2a and a transmitting filter output terminal ]b of a transmitting/receiving duplexer (not shown) separated into a transmitting filter and a receiving filter are connected by a microstrip line 3 to form an antenna terminal 4. At this time, in the transmission filter, electromagnetic waves with a frequency twice or three times the transmission frequency jump from the input terminal 1a to the microstrip line 3.
This may worsen transmission spurious characteristics. Further, in the receiving filter, a transmission wave may enter the output terminal 2b from the microstrip line 3 and deteriorate the sensitivity characteristics during transmission.

Therefore, in the past, printed circuit boards were used for the purpose of electromagnetically shielding and electromagnetic sealing between the micros 1 to 3 printed on the printed circuit board 5-F and the input/output terminals of the transmitting and receiving filters. A shield case 9 is soldered to the earth pattern provided on the casing 15, and the printed circuit board 15 is fixed to the printer 1 by screwing the board 15 into a screw hole provided in a housing 16 and tightening it.

[Problem to be solved by the invention]

The housing structure of the conventional wireless device described above is Micros 1 to
Seal 1 for electromagnetically shielding lip lines, etc. (by soldering the case) - Due to the structure of attaching it to the board, if there are few soldering points, the shielding characteristics of the shield case will change depending on the number and position. . As a result, fluctuations occur in the sensitivity characteristics during transmission at the receiver and the transmission spurious characteristics at the transmitter. Furthermore, if soldering is performed in a large number of locations to improve these characteristics, and if it is attempted to solder widely and uniformly, there is a drawback that the installation time becomes longer and the cost becomes higher.

[A shortcut to solving problems]

A housing structure of a wireless device according to the present invention is a housing structure of a wireless device in which a printed circuit board 1 to a board having at least one of an assembled component or a circuit conductor provided on one surface are attached to a metal housing. One end surface contacts the inner bottom surface of the housing and partially surrounds this bottom surface, and the other end surface includes a metal barrier that contacts the one surface of the substrate to the printer 1.

Moreover, the housing structure of the wireless device of the present invention may be configured by providing a ground conductor on the one surface of the printed circuit board that comes into contact with the one end surface of the partition.

Furthermore, the housing structure of the wireless device of the present invention may be configured such that the partition is integrally molded with the housing.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is an exploded perspective view of a main part of an embodiment of the present invention, and FIG. 2 is a top view of the main part.

In FIGS. 1 and 2, 1 is a transmission filter, 2 is a reception filter, 3 is a micros 1 to a lip line, 4 is an antenna terminal, 5 is a print 1 to a board, 6 is a metal housing, 7
is a seal 1 integrally molded vertically from the bottom of the housing 6.
~It's a wall.

The transmit filter and the receive filter 2 are mounted on two sides of the printed circuit board 5. Microstrip line 3
is printed and formed on the lower surface of the printed circuit board 5, and connects the output terminal 1b of the transmitting filter and the output terminal 2a of the receiving filter 2. The antenna terminal 4 is provided on the upper surface of the printed circuit board 5 and is connected to the micro loop 1 and the lip line 3.

An earth pattern 8 is provided around the micros 1 helical line 3, which is printed on the print 1 to the substrate 5.

This earth pattern 8 and a shield wall 7 provided in the housing 6 are electrically connected by passing through the printed circuit board 5 and occupying the printed circuit board 1 to the circuit board 5 and the housing 6. With this electrical connection, the micros 1 to the lipline 3 can be reliably electrically shielded from the input terminal 1a of the transmission filter 1, the output terminal 2b of the reception filter 2, and others.

The embodiment described above is suitable for mass production because the shield wall 7 is formed in the same shape as the housing 6.

Incidentally, since a considerable shielding effect can be obtained only by the shield wall 7, substantially the same effect can be obtained even without providing the ground pattern 8 on the printed circuit board 5.

〔Effect of the invention〕

As explained above, the present invention electromagnetically shields the required portions of the printed circuit board with the shield wall of the casing, thereby making it possible to shield the required portions without soldering the shield case to the printed circuit board. It is highly efficient and can be manufactured at low cost.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of the main parts of an embodiment of the present invention, FIG. 2 is a top view of the main parts, and FIG. 3 is an exploded perspective view of the main parts of the housing structure of a conventional wireless device. 1. Transmission filter, 2. Reception filter, 3.. Micros 1 helical tube line, 4.. Antenna terminal, 5. Print 1 to board, 6.. Housing, 7.. Shield wall, 8..
Earth pattern, 1a...transmission filter input terminal, ]
1)...Transmission filter output terminal, 2a...Reception filter input terminal, 21]...Reception filter output terminal.

Claims (3)

[Claims] 1. In a wireless device housing structure in which a printed circuit board having at least one of the assembled components or a circuit conductor provided on one surface is attached to a metal housing, one end surface contacts the inner bottom surface of the housing. What is claimed is: 1. A housing structure for a wireless device, comprising: a metal barrier that partially surrounds the bottom surface and has the other end surface in contact with the one surface of the printed circuit board. 2. 2. The housing structure of a wireless device according to claim 1, further comprising a ground conductor provided on the one surface of the printed circuit board and in contact with the one end surface of the partition. 3. 2. The wireless device housing structure according to claim 1, wherein the partition is integrally formed with the housing.