CA1145061A - Electronic shorting device - Google Patents
Electronic shorting deviceInfo
- Publication number
- CA1145061A CA1145061A CA000341424A CA341424A CA1145061A CA 1145061 A CA1145061 A CA 1145061A CA 000341424 A CA000341424 A CA 000341424A CA 341424 A CA341424 A CA 341424A CA 1145061 A CA1145061 A CA 1145061A
- Authority
- CA
- Canada
- Prior art keywords
- layer
- cylindrical
- shorting device
- metal
- plated
- 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.)
- Expired
Links
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
- H05K3/22—Secondary treatment of printed circuits
- H05K3/222—Completing of printed circuits by adding non-printed jumper connections
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/14—Non-insulated conductors or conductive bodies characterised by their form comprising conductive layers or films on insulating-supports
-
- 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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10227—Other objects, e.g. metallic pieces
- H05K2201/10363—Jumpers, i.e. non-printed cross-over connections
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Details Of Resistors (AREA)
- Printing Elements For Providing Electric Connections Between Printed Circuits (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An electronic shorting device such as a device designed for a leadless mounting on a printed circuit board is provided. The shorting device includes a cylindrical porcelain body which is plated with an electrically conducting metal.
Electrically conductive caps are fitted to each end of the plated body and a layer of non-conducting material is applied to the cylinder body between the two end caps. The use of a porcelain material for the body generates a shorting device having a heat capacity close to other leadless components, such as resistors.
An electronic shorting device such as a device designed for a leadless mounting on a printed circuit board is provided. The shorting device includes a cylindrical porcelain body which is plated with an electrically conducting metal.
Electrically conductive caps are fitted to each end of the plated body and a layer of non-conducting material is applied to the cylinder body between the two end caps. The use of a porcelain material for the body generates a shorting device having a heat capacity close to other leadless components, such as resistors.
Description
5~6~
BACKGROUND OF THE INVENTI~N
Field of the Invention The present invention relates to an electronic shorting device, and more particularly to a leadless electronic shorting device which has a low resistance and wherein the portions to be soldered may easily and q~ickly be heated to the solder melting point.
Description of the Prior Art A conventional lead-less electronic shorting device consists of a smaller cylindrical portion with larger cylindrical end-portions as electrodes, formed integrally with the smaller cylindrical portion at bo~h ends and made of conductive material.
The larger cylindrical portions are soldered to conductive patterns bridging a gap between separated patterns on a printed board, thus the conductive patterns are electrically connected to one another through the electronic shorting device. Such an electronic shorting device is generallycall~a "jumper part".
In order to attach the larger pvrtions of the jumper part to the conductive patterns, solder cream is applied to the larger portions, followed by the joint heating of them both. However, the time required to melt the solder cream applied to the larger portions of the jumper part is longer than the time re~uired to melt the solder cream applied to other leadless electronic parLs ~uch as resistors. This is primarily because the jumper part is a relatively massive device made of metal having a high thermal conductivity.
Typically, in manufacturing a jumper part, a metal rod is machined with a lathe. However, an undesira~le whisker-like projection or burr is formed on the larger portions. The cQntinuous flow of parts in a part feeder for an automatic mounting app~ratus is often disturbed by these whisker-like projections.
-1- ' .~
~S~6~
5UMMARY O~ THE INVENTION
~ he present lnvention has, accordingly, ~s an object, the provision of an electronic shorting device which overcomes the above-described defect of the conventional shorting apparatus.
Another object of this invention is to provide an electronic shorting device which has a low resistance.
A further object of this invention is to provide an electronic shorting part which may be easily manufactured.
The resolution of this objective is attained by ~nventively providing an electronic shorting apparatus which includes a cylindrical porcelain body which is plated with metal;
with conductive end caps fitted to both end portions of the cylindrical porcelain body.
More particularly, there is provided:
An electronic shorting device which comprises:
a cylindrical, porcelain body;
a layer of an electrically conducting metal coating said cylindrical, porcelain body; and a conductive end cap received by and carried upon each end portion of said cylindrical porcelain body, each end cap being in electrical contact with said layerO
There is also provided:
An electronic shorting device which compri es:
a cylindrical, porcelain body;
a layer of an electrically conducting metal plated to said cylindrical, porcelain body comprising:
a first layer of nonelectrolytically applied metal platinq said cylindrical porcelain body;
a second layer of electrolytically applied metal plat-0 ing the first layer of metal; anda conductive end cap received by and carried upon eash end portion of said cylindrical, porcelain body.
,-~
~ 2-Various other objects, features, and advantages of the present invention will become readily apparent from the ensuing detailed description and the novel features will be particularly pointed out in the appended claims.
BRIEF DESCRIPTION OF ~HE DRAWINGS
Fig. 1 is a perspective view of a conventional electronic shorting device arranged on a printed board;
Fig. ~ is a cross-sectional view of the conventional electronic shortin~device of the type as shown in Fig. l; and Fig. 3 is a cross-sectional view of an electronic shorting part according to one embodiment of the present invention.
DESCP~IPTION OF THE PREFERR~:D EMBODIMENTS
.
Before proceeding to a detailed description of the present invention, and in order to enhance the understanding thereof, a conventional electronic shorti~g devic~ will be described with reference to Figs. 1 and 2.
-2a-~ . , ~45~6~
A conventional leadless electronic shorting device which is a so-called "jumper part", is shown in Fig. 1. The electronic shorting device 1 consists of larger cylindrical portions 2 and 3, and a smaller cylindrical portion 4, made of conductive material. Referring to Fig. 1, conductive patterns 7 and 8 are formed at both sides of a conductive pattern 6 in a printed board 5. The patterns 6, 7 and 8 are separated from each other as shown in Fig. 1. The patterns 7 and 8 are electrically connected to each other through the electronic shorting device 1 arranged across the pattern 6.
For example, a rod of brass is machined by a lathe to form the larger cylindrical portions 2 and 3 and the smaller cylindrical portion 4 of predetermined dimensions. The entire surface of the produced electronic shorting device 1 is plated with nickel or 95% of tin and 5% of solder. However, an undesirable whisker-like projection 9 is often formed on the end surface of one of the larger cylindrical portions 2 or 3 during the completion of the lathe machining.
Generally, an automatic mounting apparatus is used for mounting various electronic parts onto a printed board. A part feeder is provided as a component of the automatic mounting apparatus ~nen the electronic shorting devices 1 are transported in the part feeder, they are often caught by internal projections and constructions of the part feeder because of the whisker-like projections or burrs 9. This of course results in a disturbance of the smooth flow of parts. Accordingly, a process to remove the whisker-like projections 9 is required, causing the manufacturin~
cost to increase.
1~45~6~
In the mounting process, the shorting devices 1 and other electronic parts are provisionally attached to predetermined conductive patterns with solder cream on a printed board, They are then heated within a gas furnace or by infrared rays to melt the solder cream which, after cooling~ firmly attaches other electronic parts to the predeterm;ned conductive patterns.
However, the time required to melt the solder cream applied to the larger cylindrical portions 2 and 3 of the jumper part 1 is longer than the time required to melt the solder cream applied to the electrode portions of the other electric parts. This is because the jumper part l is entirely made of metal having a high thermal conductivity, and therefore heat is rapidly transmitted away from the metal surface and to the internal portion of the jumper part 1.
The followin~ is a description of an electronic shorting device according to an embodiment of the present lnvention with reference to Fig. 3.
Referring to Fig r 3 ! a jumper part or de~ice 11 lncludes a cylindrical body 12 made of a ceramic such as porcelain. The circumferential surface of the cylindrical body 12 are tapered, for example~ by a barrel polishing method ! as indicated by reference numerals 12a and 12_. Due to the slants 12a and 12_~
the caps 14 and 15 can be easily fitted to the end portions of the cylindrical body 12.
The cylindrical body 12 is first plated with metal such as sil~er or copper by a nonelectrolytic plating method, to th.e depth of about 2~ ~. Then~ the thus obtained metal layer of the cylindrical body 12 is plated with,metal such as silver or copper by an electrolytic plating method, to the depth of about 50 to 60 ~ m. Thus~ the metal layer 13 as shown in Fig~ 3 is formed ~n the cylindrica.l body 12, In order to prevent oxidation, the ~etal layer 13 may be further plated with. nickel~
16~
The caps 14 and 15 are made of conductive metal such as brass or iron with a thickness of about 200 ~ m. They are also plated, using a tin material containing 5 to 10% of solder.
The caps 14 and 15 are fitted to the end portions of the cylindrical body 12 by a driving-fit or impacting method.
The contact resistance between the metal layer 13 and the caps 14 and lS is satisfactoriiy low.
The following example is for illustrative purposes and is not to be viewed as limiting the scope of the present invention.
Thermo-setting resin of an epoxy group or an ultraviolet-setting resin thereof may be used as the material for the insulating film 16. The insulatin~ material 16 is coated onto the metal layer 13 to a depth which is smaller than the thickness of the caps 14 and 15, for example about 200 /um. The obtained insulating layer 16 is ~uitar-shaped with bulges adjacent the caps 14 and 15. It is pre~erable that the height of the enlarged portions of the insulating film 16 at the edges of the caps 14 and 15 is smaller than 50 ~ m. Dimensions ~ andQ 2 as shown in Fig. 3 are as follows:
~ - 2.2~m or 2.5mm;
R 1 = 6mm or 8mm; and
BACKGROUND OF THE INVENTI~N
Field of the Invention The present invention relates to an electronic shorting device, and more particularly to a leadless electronic shorting device which has a low resistance and wherein the portions to be soldered may easily and q~ickly be heated to the solder melting point.
Description of the Prior Art A conventional lead-less electronic shorting device consists of a smaller cylindrical portion with larger cylindrical end-portions as electrodes, formed integrally with the smaller cylindrical portion at bo~h ends and made of conductive material.
The larger cylindrical portions are soldered to conductive patterns bridging a gap between separated patterns on a printed board, thus the conductive patterns are electrically connected to one another through the electronic shorting device. Such an electronic shorting device is generallycall~a "jumper part".
In order to attach the larger pvrtions of the jumper part to the conductive patterns, solder cream is applied to the larger portions, followed by the joint heating of them both. However, the time required to melt the solder cream applied to the larger portions of the jumper part is longer than the time re~uired to melt the solder cream applied to other leadless electronic parLs ~uch as resistors. This is primarily because the jumper part is a relatively massive device made of metal having a high thermal conductivity.
Typically, in manufacturing a jumper part, a metal rod is machined with a lathe. However, an undesira~le whisker-like projection or burr is formed on the larger portions. The cQntinuous flow of parts in a part feeder for an automatic mounting app~ratus is often disturbed by these whisker-like projections.
-1- ' .~
~S~6~
5UMMARY O~ THE INVENTION
~ he present lnvention has, accordingly, ~s an object, the provision of an electronic shorting device which overcomes the above-described defect of the conventional shorting apparatus.
Another object of this invention is to provide an electronic shorting device which has a low resistance.
A further object of this invention is to provide an electronic shorting part which may be easily manufactured.
The resolution of this objective is attained by ~nventively providing an electronic shorting apparatus which includes a cylindrical porcelain body which is plated with metal;
with conductive end caps fitted to both end portions of the cylindrical porcelain body.
More particularly, there is provided:
An electronic shorting device which comprises:
a cylindrical, porcelain body;
a layer of an electrically conducting metal coating said cylindrical, porcelain body; and a conductive end cap received by and carried upon each end portion of said cylindrical porcelain body, each end cap being in electrical contact with said layerO
There is also provided:
An electronic shorting device which compri es:
a cylindrical, porcelain body;
a layer of an electrically conducting metal plated to said cylindrical, porcelain body comprising:
a first layer of nonelectrolytically applied metal platinq said cylindrical porcelain body;
a second layer of electrolytically applied metal plat-0 ing the first layer of metal; anda conductive end cap received by and carried upon eash end portion of said cylindrical, porcelain body.
,-~
~ 2-Various other objects, features, and advantages of the present invention will become readily apparent from the ensuing detailed description and the novel features will be particularly pointed out in the appended claims.
BRIEF DESCRIPTION OF ~HE DRAWINGS
Fig. 1 is a perspective view of a conventional electronic shorting device arranged on a printed board;
Fig. ~ is a cross-sectional view of the conventional electronic shortin~device of the type as shown in Fig. l; and Fig. 3 is a cross-sectional view of an electronic shorting part according to one embodiment of the present invention.
DESCP~IPTION OF THE PREFERR~:D EMBODIMENTS
.
Before proceeding to a detailed description of the present invention, and in order to enhance the understanding thereof, a conventional electronic shorti~g devic~ will be described with reference to Figs. 1 and 2.
-2a-~ . , ~45~6~
A conventional leadless electronic shorting device which is a so-called "jumper part", is shown in Fig. 1. The electronic shorting device 1 consists of larger cylindrical portions 2 and 3, and a smaller cylindrical portion 4, made of conductive material. Referring to Fig. 1, conductive patterns 7 and 8 are formed at both sides of a conductive pattern 6 in a printed board 5. The patterns 6, 7 and 8 are separated from each other as shown in Fig. 1. The patterns 7 and 8 are electrically connected to each other through the electronic shorting device 1 arranged across the pattern 6.
For example, a rod of brass is machined by a lathe to form the larger cylindrical portions 2 and 3 and the smaller cylindrical portion 4 of predetermined dimensions. The entire surface of the produced electronic shorting device 1 is plated with nickel or 95% of tin and 5% of solder. However, an undesirable whisker-like projection 9 is often formed on the end surface of one of the larger cylindrical portions 2 or 3 during the completion of the lathe machining.
Generally, an automatic mounting apparatus is used for mounting various electronic parts onto a printed board. A part feeder is provided as a component of the automatic mounting apparatus ~nen the electronic shorting devices 1 are transported in the part feeder, they are often caught by internal projections and constructions of the part feeder because of the whisker-like projections or burrs 9. This of course results in a disturbance of the smooth flow of parts. Accordingly, a process to remove the whisker-like projections 9 is required, causing the manufacturin~
cost to increase.
1~45~6~
In the mounting process, the shorting devices 1 and other electronic parts are provisionally attached to predetermined conductive patterns with solder cream on a printed board, They are then heated within a gas furnace or by infrared rays to melt the solder cream which, after cooling~ firmly attaches other electronic parts to the predeterm;ned conductive patterns.
However, the time required to melt the solder cream applied to the larger cylindrical portions 2 and 3 of the jumper part 1 is longer than the time required to melt the solder cream applied to the electrode portions of the other electric parts. This is because the jumper part l is entirely made of metal having a high thermal conductivity, and therefore heat is rapidly transmitted away from the metal surface and to the internal portion of the jumper part 1.
The followin~ is a description of an electronic shorting device according to an embodiment of the present lnvention with reference to Fig. 3.
Referring to Fig r 3 ! a jumper part or de~ice 11 lncludes a cylindrical body 12 made of a ceramic such as porcelain. The circumferential surface of the cylindrical body 12 are tapered, for example~ by a barrel polishing method ! as indicated by reference numerals 12a and 12_. Due to the slants 12a and 12_~
the caps 14 and 15 can be easily fitted to the end portions of the cylindrical body 12.
The cylindrical body 12 is first plated with metal such as sil~er or copper by a nonelectrolytic plating method, to th.e depth of about 2~ ~. Then~ the thus obtained metal layer of the cylindrical body 12 is plated with,metal such as silver or copper by an electrolytic plating method, to the depth of about 50 to 60 ~ m. Thus~ the metal layer 13 as shown in Fig~ 3 is formed ~n the cylindrica.l body 12, In order to prevent oxidation, the ~etal layer 13 may be further plated with. nickel~
16~
The caps 14 and 15 are made of conductive metal such as brass or iron with a thickness of about 200 ~ m. They are also plated, using a tin material containing 5 to 10% of solder.
The caps 14 and 15 are fitted to the end portions of the cylindrical body 12 by a driving-fit or impacting method.
The contact resistance between the metal layer 13 and the caps 14 and lS is satisfactoriiy low.
The following example is for illustrative purposes and is not to be viewed as limiting the scope of the present invention.
Thermo-setting resin of an epoxy group or an ultraviolet-setting resin thereof may be used as the material for the insulating film 16. The insulatin~ material 16 is coated onto the metal layer 13 to a depth which is smaller than the thickness of the caps 14 and 15, for example about 200 /um. The obtained insulating layer 16 is ~uitar-shaped with bulges adjacent the caps 14 and 15. It is pre~erable that the height of the enlarged portions of the insulating film 16 at the edges of the caps 14 and 15 is smaller than 50 ~ m. Dimensions ~ andQ 2 as shown in Fig. 3 are as follows:
~ - 2.2~m or 2.5mm;
R 1 = 6mm or 8mm; and
2 = 1.5mm.
The internal resistance o the above-described jumper part 11~ namely the resistance between the caps 14 and 15, can be a$ low as 4 to 5mQ, Generallyr the internal resistance required ~or a ~umper part is lower than about lOmQ, The thermal conductiyity o~ the cylindrical body 12 made of ceramics such as porcelain is low. Accordingly~ the time required to mel~ the ~older c~eam applied to the caps 14 and 15 of the jumper part 11 is shortened in comparison with the 506~L
conventional jumper part 1, and it is comparable to the time required to melt the soldered cream applied to the electrode portions of the other electric parts.
A cylindrical body for a leadless carbon resistor may be used as the cylindrical body 12. The cylindrical bodies for the jumper part 11 and the leadless carbon resistor may be equal to each other in shape and size. Accordingly, a manufacturing apparatus for carbon resistor can be used for the jumper part 11, and so the jumper part 11 can be mass-produced in economical manner.
Ceramics such as porcelain are lighter than brass which is a typical material for the conventional jumper part 1.
Accordingly, the jumper part 11 when provisionally attached to the printed board, does not fall out as easily from the printed board when it is overturned as does the conventional jumper part 1 when it is provisionally attached to the same printed board.
~ hile we have disclosed an exemplary structure to illustrate the principles of the invention, it should be understood that we wish to embody within the scope of the patent warranted hereon all such modifications as reasonably and properly come within the scope of our contribution to the art.
The internal resistance o the above-described jumper part 11~ namely the resistance between the caps 14 and 15, can be a$ low as 4 to 5mQ, Generallyr the internal resistance required ~or a ~umper part is lower than about lOmQ, The thermal conductiyity o~ the cylindrical body 12 made of ceramics such as porcelain is low. Accordingly~ the time required to mel~ the ~older c~eam applied to the caps 14 and 15 of the jumper part 11 is shortened in comparison with the 506~L
conventional jumper part 1, and it is comparable to the time required to melt the soldered cream applied to the electrode portions of the other electric parts.
A cylindrical body for a leadless carbon resistor may be used as the cylindrical body 12. The cylindrical bodies for the jumper part 11 and the leadless carbon resistor may be equal to each other in shape and size. Accordingly, a manufacturing apparatus for carbon resistor can be used for the jumper part 11, and so the jumper part 11 can be mass-produced in economical manner.
Ceramics such as porcelain are lighter than brass which is a typical material for the conventional jumper part 1.
Accordingly, the jumper part 11 when provisionally attached to the printed board, does not fall out as easily from the printed board when it is overturned as does the conventional jumper part 1 when it is provisionally attached to the same printed board.
~ hile we have disclosed an exemplary structure to illustrate the principles of the invention, it should be understood that we wish to embody within the scope of the patent warranted hereon all such modifications as reasonably and properly come within the scope of our contribution to the art.
Claims (4)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An electronic shorting device which comprises:
a cylindrical, porcelain body;
a layer of an electrically conducting metal plated to said cylindrical, porcelain body comprising:
a first layer of nonelectrolytically applied metal plating said cylindrical porcelain body;
a second layer of electrolytically applied metal plat-ing the first layer of metal; and a conductive end cap received by and carried upon each end portion of said cylindrical, porcelain body.
a cylindrical, porcelain body;
a layer of an electrically conducting metal plated to said cylindrical, porcelain body comprising:
a first layer of nonelectrolytically applied metal plating said cylindrical porcelain body;
a second layer of electrolytically applied metal plat-ing the first layer of metal; and a conductive end cap received by and carried upon each end portion of said cylindrical, porcelain body.
2. An electronic shorting device as described in claim 1 and further comprising:
a circumferential layer of insulating material coating said cylindrical porcelain body, plated with conductive metal, between said conductive caps.
a circumferential layer of insulating material coating said cylindrical porcelain body, plated with conductive metal, between said conductive caps.
3. An electronic shorting device as described in claim 1 wherein the second layer of applied metal is thicker than the first layer of applied metal.
4. An electronic shorting device as described in claim 1 wherein the first layer of applied metal is nonelectro-lytically plated to a depth of about 2 µm and the second layer of applied metal is electrolytically plated to a depth of about 50 to 60 µm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17358578U JPS6138219Y2 (en) | 1978-12-15 | 1978-12-15 | |
| JP173585/78 | 1978-12-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1145061A true CA1145061A (en) | 1983-04-19 |
Family
ID=15963298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000341424A Expired CA1145061A (en) | 1978-12-15 | 1979-12-07 | Electronic shorting device |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS6138219Y2 (en) |
| CA (1) | CA1145061A (en) |
| GB (1) | GB2040110B (en) |
| NL (1) | NL7908987A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0249650Y2 (en) * | 1985-08-24 | 1990-12-27 |
-
1978
- 1978-12-15 JP JP17358578U patent/JPS6138219Y2/ja not_active Expired
-
1979
- 1979-12-07 CA CA000341424A patent/CA1145061A/en not_active Expired
- 1979-12-12 GB GB7942855A patent/GB2040110B/en not_active Expired
- 1979-12-13 NL NL7908987A patent/NL7908987A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| GB2040110B (en) | 1983-05-11 |
| NL7908987A (en) | 1980-06-17 |
| JPS5588273U (en) | 1980-06-18 |
| GB2040110A (en) | 1980-08-20 |
| JPS6138219Y2 (en) | 1986-11-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |