GB2230990A - Hole plug and method of plugging holes - Google Patents
Hole plug and method of plugging holes Download PDFInfo
- Publication number
- GB2230990A GB2230990A GB8910383A GB8910383A GB2230990A GB 2230990 A GB2230990 A GB 2230990A GB 8910383 A GB8910383 A GB 8910383A GB 8910383 A GB8910383 A GB 8910383A GB 2230990 A GB2230990 A GB 2230990A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bores
- pcb
- plugs
- plug
- strip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 10
- 229910000679 solder Inorganic materials 0.000 claims abstract description 20
- 238000003780 insertion Methods 0.000 claims abstract description 8
- 230000037431 insertion Effects 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims description 5
- 239000004020 conductor Substances 0.000 claims description 2
- 230000000717 retained effect Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 6
- 238000007747 plating Methods 0.000 claims 2
- 239000006071 cream Substances 0.000 abstract description 2
- 238000009825 accumulation Methods 0.000 abstract 1
- WEJZHZJJXPXXMU-UHFFFAOYSA-N 2,4-dichloro-1-phenylbenzene Chemical compound ClC1=CC(Cl)=CC=C1C1=CC=CC=C1 WEJZHZJJXPXXMU-UHFFFAOYSA-N 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000012811 non-conductive material Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/0094—Filling or covering plated through-holes or blind plated vias, e.g. for masking or for mechanical reinforcement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass
- B23K37/06—Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass for positioning the molten material, e.g. confining it to a desired area
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/05—Patterning and lithography; Masks; Details of resist
- H05K2203/0548—Masks
- H05K2203/0557—Non-printed masks
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/3452—Solder masks
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
- Electric Connection Of Electric Components To Printed Circuits (AREA)
Abstract
A method of constructing an electronic circuit on a double sided printed circuit board (PCB) using surface-mount techniques includes inserting a plug 2 into each of the metal-plated bores in the PCB prior to the solder reflowing operation. The surface mount components are connected to their respective solder pads on the PCB using solder paste or cream. The presence of the plugs in the bores prevents the movement of the solder away from the joints and its accumulation in the bores during the solder reflowing operation. A PCB having its plated bores plugged and a strip of plugs arranged to facilitate automatic insertion into a bore are also disclosed. <IMAGE>
Description
Hole plug and method of plugging holes
This invention relates to a hole plug and a method of plugging holes in a printed circuit board.
Printed circuit boards (PCBs) are widely used in the construction of electronic circuits and in their double-sided form include "via holes" (bores which are metal plated) which provide connections between one side of the PCB and the other.
There is, however, a functional problem which arises in the construction of circuits using surface mount components on double-sided PCBs having via holes.
During construction solder cream or paste is applied to the PCB and the components which form the circuit are then "onserted". During subsequent solder re-flowing the solder already provided on the board is attracted towards, and flows into, the via holes, drawing solder away from the solder pads on which the components are mounted and causing "dry" joints between the components and the PCB. There is therefore a need for means of simply and rapidly plugging via holes so that the above disadvantage may be avoided.
According to the present invention there is provided a plurality of plugs detachably arranged in a continuous strip, each plug being substantially discshaped. Preferably each plug includes means for retaining the plug in a bore of a board substantially of the same shape as the plug.
The present invention further provides a method for constructing an electronic circuit on a double-sided printed circuit board (PCB), the PCB having a number of metal-plated bores extending between the two surfaces of the PCB, including:
inserting a plug into a bore, the plug having substantially the same shape as the bore.
Preferably the disc-shaped plugs are provided in a continuous flat strip and have a radius which is slightly smaller than that of the bore into which they are inserted.
The plugs may be provided with a coined edge to facilitate detachment of a single plug from a strip of plugs.
Retention of a plug in its respective hole may be effected by an interference fit of, for example, tabs or a serrated surface on the plugs with the walls of the bores.
The plugs may be inserted into the bores manually or, for example, by means of a CNC-operated positioning machine. The plugs may be formed from a conductive material (e.g. metal) or a non-conductive material such as high temperature plastic.
A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawings, in which:
Figure la shows a plan view of a strip of disc-shaped plugs with the portion of the strip cutaway, the plugs being provided with securing tabs;
Figure 1b illustrates a single plug of an alternative form with a serrated edge, the remainder of the strip being cut away;
Figure 2a shows in perspective a strip of plugs with a single plug positioned above the surface-of a PCB ready for insertion into its respective bore;
Figure 2b shows in perspective a single bore in a PCB into which a plug has been fitted.
Referring to Figure la, a strip 1 of plugs 2 is shown with the portion of the strip cut away.
Consecutive plugs 2 are attached to each other by means of bridge members 3 to form the strip 1.
The plugs 2 have tabs 4 which make an interference fit with the walls of the bores (not shown) into which they are inserted.
The tabs 4 have coined surfaces 5 at the junction with the bridge members 3 to facilitate detachment of the plug 2 from the strip 1.
In Figure 1b a single plug 2 of an alternative form is shown. The plug 2 has coined surfaces 5 as before but in place of tabs the plug 2 is provided with serrated surfaces 6 to effect an interference fit with the walls of the bore (not shown) into which it is inserted.
Referring to Figure 2a, a portion of a doublesided PCB 7 is shown with a strip of plugs positioned above the PCB 7. A single via hole (metal plated bore) 8 is illustrated, the metal on the walls 9 of the via hole 8 making electrical contact with solder strip 11 via solder pad 10.
The axis 12 of the plug 2 is aligned with that of the via hole 8 prior to insertion of plug 2 into the vial hole 8. To insert the plug 2 a force is applied along axis 12 in the direction of arrow 13, the force causing the plug 2 to detach from the strip 1 at the junction of tab 4 and bridge member 3 due to the coined surface 5.
Figure 2b shows the portion of this doublesided PCB 7 of Figure 2a after the plug 2 has been fitted into the via hole 8. The plug 2 is retained in the via hole 8 by means of an interference fit of the tabs 4 with the walls 9 (not shown) of the via hole 8.
After insertion of the-plug 2 the strip 1 may be paid out from its source to align the axis of the next plug 2 with the direction of the insertion force, and the strip 1 and the means for applying the insertion force moved to a position above the next via hole 8 to be plugged, as shown in Figure 2a.
The above arrangement ensures that when mounting surface mount components in the board, solder is not drawn away from the pads 10 into the via holes 8.
Claims (12)
1. A method of constructing an electronic circuit on a printed circuit board (PCB), including the steps of:
providing a PCB having a number of conductive pads on one or each surface thereof and having a number of bores extending between the surfaces;
applying solder material to pre-determined conductive pads on one or each surface of the PCB;
inserting into each bore a plug having substantially the same dimensions as the bores; and
causing the solder material to reflow;
wherein the plugs are inserted prior to the solder reflow operation and prevent the collection of the solder material in the bores during the reflow operation.
2, A method according to claim 1, further including the step of plating the bores with a conductive material; wherein the insertion of the plugs into the bores is performed after the plating step.
3. A method according to claims 1 or 2, wherein the insertion of a plug into a respective bore is performed by a CNC-operated positioning machine.
4. A printed circuit board (PCB) for surfacemount electronic components, the PCB having a number of conductive pads on one or each surface thereof and having a number of components mounted on, and attached to, pre-determined conductive pads by means of solder material, the solder material providing electrical connection therebetween, and having a number of bores extending between the surfaces thereof, wherein a plug is located substantially within each of the bores and prevents collection of solder material therein.
5. A printed circuit board according to claim 4, wherein each plug is retained within a respective bore by means of an interference fit with the walls of the bore.
6. A printed circuit board according to claims 4 or 5, wherein the bores comprise metal plated bores,.
7. A strip of plugs for plugging bores in a double sided printed circuit board (PCB), the strip comprising a plurality of substantially disc-shaped plugs detachably joined to the strip, wherein adjacent plugs are separated by a bridging member.
8. A strip according to claim 7, wherein the plugs are detachably joined to the bridging members at a coined surface.
9. A strip according to claims 7 or 8, wherein:
each plug is provided with interference means for providing an interference fit with the walls of a bore.
10. A method of constructing an electronic circuit on a printed circuit board (PCB) substantially as hereinbefore described with reference to Figures 1 and 2 of the accompanying#drawings.
11. A printed circuit board for surface mount electronic components substantially as hereinbefore described with reference to Figures 1 and 2 of the accompanying drawings.
12. A strip of plugs for bores in a PCB substantially as hereinbefore described with reference to Figures 1 and 2 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8910383A GB2230990A (en) | 1989-05-05 | 1989-05-05 | Hole plug and method of plugging holes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8910383A GB2230990A (en) | 1989-05-05 | 1989-05-05 | Hole plug and method of plugging holes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8910383D0 GB8910383D0 (en) | 1989-06-21 |
| GB2230990A true GB2230990A (en) | 1990-11-07 |
Family
ID=10656293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8910383A Withdrawn GB2230990A (en) | 1989-05-05 | 1989-05-05 | Hole plug and method of plugging holes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2230990A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117161833A (en) * | 2023-08-15 | 2023-12-05 | 江门市和美精艺电子有限公司 | Brushing and grinding method and device for substrate |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1474247A (en) * | 1974-01-08 | 1977-05-18 | Siemens Ag | Provision of solder-stop protection for conductor paths on circuit boards |
-
1989
- 1989-05-05 GB GB8910383A patent/GB2230990A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1474247A (en) * | 1974-01-08 | 1977-05-18 | Siemens Ag | Provision of solder-stop protection for conductor paths on circuit boards |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8910383D0 (en) | 1989-06-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |