GB2258953A

GB2258953A - Circuit board and shielding housing

Info

Publication number: GB2258953A
Application number: GB9118060A
Authority: GB
Inventors: Kun-Nan Lo
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-05-08
Filing date: 1991-08-21
Publication date: 1993-02-24
Also published as: DE4115153A1; GB9118060D0; FR2677211B1; FR2677211A1; DE4115153C2

Description

2 2-)8? 31 --I-- CIRCUIT BOARD AND SHIE'LDING HOUSItiC The invention

relates to a housing and a circuit board, more particularly to the construction method of- a housing on a circuit board for example for shielding a transformer and associated parts, also mounted on the circuit board.

As it is well known a circuit board of a computej comprises a plurality of electronic subassemblies, a transformer and other associated parts. The transformer is generally isolated from all the electronic subassemblies by an aluminum housing. The purpose of the aluminum housing is to prevent heat dissipation and magnetic flux of the transformer from affecting the functioning of the electronic subassemblies. It has been found that a lot of work has to be done to mount said aluminum housing on said circuit board because the housing is first mounted on the circuit board and later secured by means of screws. Occasionally, when it its desired to disassemble the housing from the circuit board, each of the screws must be loosened and only then can the housing be removed from the circuit board. This is very inconvenient.

Therefore, the main object of the present invention is to provide a i __1housing having means to mount it on a circuil board of for example a computer easily and more conveniently than prior models.

0- According to one aspect of the invention there is provided a circuit board having a housing mounted thereon, said housing having a plurality of bores, said circuit board having plurality of holes aligned with said bores, and there being a plurality of pins extending through said aligned holes and bores wherein said housing is secured to the circuit board so as to be held in place during normal use and the application of a predetermined force causes the housing to be separated from the circuit board.

According to a second aspect of the invention, there is provided a circuit board having-a shielding housing mounted thereon, characterised by:

said housing having at least one side wall generally perpendicularly mounted on said circuit board, the or each said side wall having at least one elongated projection extending substantially perpendicular to said circuit board, the or each said elongated projection having a through bore formed along its length; said circuit board having a plurality of mounting holes therein; and a plurality of pins each of which has one end fixed to said circuit board and the other end passing through one of said mounting holes of said circuit board and inserted into one of said through bores of said elongated projections.

-3 In one embodiment, an aluminum housing mounted on a circuit board of a computer for shielding a transformer includes an top open end, an bottom open end and four side walls interconnecting the top open end and the bottom open end. Each wall has at least one elongated projection extending from the top open end towards the bottom open end, perpendicular to the circuit board. Each of the elongated projections has a through bored along its length. The circuit board a plurality of mounting holes therein. Each of a plurality of pins, has a first end fixed in the circuit board and a second end passing through the mounting hole of the circuit board and inserted into the through bore of one of the elongated projections.

other features and advantages of the present invention will become more apparent in the following detailed description, including drawings, all of which show an exemplifying embodiment of the present invention, and of which:

Figure 1 is a schematic, perspective view of an aluminium housing.

Figure 2 is a perspective view of thealuminum housing of Figure 11 mounted on a circuit board- Figure 3 illustrates how the housingi!is mounted on a circuit board.

Referring to Figure 1, an aluminum housing 20 1-- - i t. is shown to comprise a top open end, a bottom open end and four side walls interconnecting the top open end to the bottom open end. Each of the four side walls has a plurality of elongated projections 22 extending from the top open end towards the bottom open end. Each of the elongated projections 22 has a through bore 222 along its length.

The circuit board 101 1,has a plurality of mounting holes 11 therein. The housing 20 is placed on the circuit board 10 in a such manner that the elongated projections 22 are disposed perpendicular to the circuit board 10. Each of a plurality of pins 301 has a first end 302 fixed in the circuit board 10 and a second end passing through one of the mounting holes of the circuit board 10 and inserted into the through bore 222 of one of the elongated projections 22, as shown in Figure 3. Then, the pins 30 are soldered by a known related art. It is to be understood that the soldering attaches the housing 20 to the circuit board 10 strongly enough to resist undeliberate displacement, but not strongly enough to withstand a deliberate pull by an ordinary man. So, that when it is desired to remove the aluminum housing, one only has to impart a little force, thus can save a lot of work and precious time.

The four side walls of the housing 20 define a space for enclosing a transformer (not shown) also 5- provided on the circuit board 10. The aluminiun housing 20 can prevent heat and magnetic flux produced and caused by the transformer from affecting the electronic subassemblies located around the housing 20. The housing 20 further has a plurality of holes 21 in the walls which are provided to facilitate electrical connections.

GP ' 56691.705

Claims

1. A circuit board having a housing mounted thereon, said housing having a plurality of bores, said circuit board having plurality of holes aligned with said bores, and there being a plurality of pins extending through said aligned holes and bores wherein said housing is secured to the circuit board so as to be held in place during normal use and the application of a predetermined force causes the housing to be separated from the circuit board.

2. A circuit board as claimed in claim 1, wherein said housing is for shielding a transformer.

3. A circuit board as claimed in claim 1 or 2 wherein said housing comprises aluminium.

4. A circuit board as claimed in any preceding claim wherein the housing is attached to said circuit board by soldering.

5. A circuit board having a shielding housing mounted thereon, characterised by: said housing having at least one side wall generally perpendicularly mounted on said circuit board, the or each said side wall having at least one elongated projection extending substantially perpendicular to said circuit board, the or each said elongated projection having a through bore formed along its length; said circuit board having a plurality of mounting holes therein; and a plurality of pins each of which has one end fixed to said circuit board and the other end passing through one of said mounting holes of said circuit board and inserted into one of said through bores of said elongated projections.

6. A circuit board as claimed in claim 5, wherein each of said elongated projections has an axial slit extending along the same.

7. A circuit board as claimed in claim 5 or 6 wherein said housing comprises aluminium.

8. A housing substantially as described heretobefor with reference to Figures 1 to 3.