GB1591006A

GB1591006A - Electrical component plug termination

Info

Publication number: GB1591006A
Application number: GB1251078A
Authority: GB
Original assignee: Draloric Electronic GmbH
Current assignee: Draloric Electronic GmbH
Priority date: 1977-03-30
Filing date: 1978-03-30
Publication date: 1981-06-10
Also published as: DE2713972B2; DE2713972C3; DE2713972A1; AT369218B; ATA169878A; FR2386233A1; FR2386233B1

Description

(54) AN ELECTRICAL COMPONENT PLUG TERMINATION (71) We, DRALORIC ELECTRONIC GmbH, of Am Plärrer 27, 8500 Nurnberg, Federal Republic of Germany, a German body corporate, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: The invention relates to an electrical component with plug terminations having stops in order to limit the insertion depth of its plug termination. The termination is particularly suitable for applications where the component is to be provided with an electrically insulating dip casing.

With electrical components which are envisaged for incorporation in printed circuits for example, it is desirable to provide stops on the component body or on the connecting elements in order to limit the insertion depth of the termination or connections into the openings in the printed circuit. Thus the component should be protected from being heated to too large an extent during soldering in.

An electrical component is known from German GM 7 220 448 for incorporation in printed circuits which is provided with a casing which has at least one projection abutting the circuit board at the side facing the printed circuit. Furthermore, it is known to ensure the necessary spacings by appropriately bending the connecting wires or in flat connecting elements, as are used chiefly in integrated circuits and modules, to form appropriate extensions during stamping, the insertion depth being limited by these extensions.

A method of manufacturing stops for the purpose of limiting the insertion depth of plug connections of electrical components is known from German Offenlegungsschrift No.

2 346 340 in which the connections are dipped into a bath of tin and, by selecting the heat conductance and heat capacitance of the connections and attached members, the bath of tin solidified at its surface around the connections thereby forming a bead.

This bead has a round shape and only serves to limit the insertion depth of the com ppnents into a printed circuit. It does not serve to delimit the casing of the component which is previously encased with this known method.

The present invention seeks to provide an electrical component in which the dip casing extends up to a precisely defined region of the connecting elements and serves as a stop for the purpose of limiting the insertion depth of its plug connection therein.

According to one aspect of the invention, there is provided an electrical dip insulated component having a plurality of plug terminations in the form of wires each termination having a bead with a frusto conical surface, the beads acting to limit the insertion depth of its plug termination and delimiting the dip insulation.

Preferably the edge angle of the bead is smaller than a 1 3 right the angle and its outer diameter is 1.5 to 3 times the diameter of the plug termination.

According to another aspect of the invention there is provided a method of manufacturing an electrical component comprising the steps of attaching to the component at least one plug termination provided with a bead having a surface of frusto conical form and dipping the component into a coating medium up to the level of the bead.

Advantages which may be achieved by the invention are that in the case of dip-encased components the varnished or enamel coated beads (which look like trousers) on the connecting elements have precisely defined lengths and this is often not the case in known components and leads to faults in manufacture. A further advantage lies in that the coatings of the beads are not damaged when inserting the component into a printed circuit since they are protected by the beads themselves. With conventional components the varnished projections and whole pieces of the casing of the component with the varnished projections can be chipped off when inserting them into a printed circuit.

Similarly the solder connection on the opposite side of the printed circuit is protected by the bead since displacement of the conneotion is prevented by the bead. Moreover when dipping the components into the encapsulating or coating material it is not necessary to proceed particularly carefully with regard to the maximum permitted length of the varnished beads since the casing material only extends precisely up to the bead as a result of its consistency and surface tension is limited by it. Since the underside of the bead can be soldered these components can be used in circuit boards having two layers whereby a particularly safe solder connection is achieved.

In order that the invention and its various other preferred features may be understood more easily, embodiments thereof will now be described, by way of example only, with reference to the drawings in which : * Figure 1 is a side elevation partly cut away showing a wafer-shaped component constructed in accordance with the invention having two plug connections arranged at a defined grid spacing, Figure 2 is a side elevation partly cut away showing a second embodiment of the invention in the form of a component with twelve parallel plug connections adjacent each other and, Figure 3 is an enlarged portion of a plug connection of the embodiments of Figures 1 and 2 showing details of a bead.

Figure 1 shows a component 1 having a wafer-shaped component body 2 which is provided with a metal structure, for example in the form of capacitor coatings on both opposite main surfaces. Wire connecting elements 3, forming plug terminations, which are angled off at the ends are fixed to the coatings, in which connecting elements 3 beads 4 are squeezed and stamped or forged for example in the manner employed for screw or bolt heading. The beads are formed so as to extend all round the wire plug termination 3. A dip casing 5 covers the component body 2 completely and extends percisely up to the beads 4 so that the coated e.g. enamelled or varnished beads 6 (which look like trousers) have precisely defined lengths. The component 1 can be a wafer-shaped capacitor, a multi-layer capacitor, an electrical resistor, a piezo-electrical filter or other such component.

When dipping the component, the consistency of dip material is chosen as regards its rheological or flow characteristics and its surface tension to match the bead dimensions such that the material of the dip casing of the plug termination extends as far as the beads and stops there so that the casing is precisely delimited.

Figure 2 shows another component 1 in the form of a module equipped with twelve wire plug connections 3. Here too each plug connection 3 has a bead 4 which precisely delimits the casing 5 on the wire plug connections 3.

Figure 3 shows a bead 4 the outer diameter of which is 1.5 to 3 times greater than the diameter of the plug connection 3 and its edge angle a is an acute angle. The casing 5 extends up to the edge of the bead 4 and is limited by the bead 4.

The opening in the printed circuit has a smaller diameter than the outer diameter of the bead 4 so that the bead abuts the printed circuit and the material of the casing 5 does not come into contact directly with the printed circuit.

Various modifications may be made to the above described arrangements. While the beads of the plug terminations projecting on one side of the component may all lie at the same height relative to the component, they may, instead, lie at different heights.

WHAT WE CLAIM IS:- 1. An electrical dip insulated component having a plurality of plug terminations in the form of wires each termination having a bead with a frusto-conical surface, the beads acting to limit the insertion depth of its plug termination and delimiting the dip insulation.

2. An electrical component according to claim 1, wherein the edge angle of the bead is smaller than a right angle and the outer diameter of the bead is 1.5 to 3 times the diameter of the plug termination.

3. An electrical component according to claim 1, or 2 wherein the beads of the plug terminations projecting on one side of the component all lie at the same height relative to the component.

4. An electrical component according to claim 1, or 2 wherein, the beads of the plug terminations projecting on one side of the component do not all lie at the same height relative to the component.

5. An electrical component according to claim 1, or 2 wherein, two plug terminations run in parallel from the component member in the same direction adjacent each other at a certain spacing and ecah plug termination has a bead in the vicinity of the region provided for fixing to the component.

6. An electrical component according to claim 1, or 2 wherein, two plug terminations are provided at an axial spacing from the component body and each plug termination has a bead in the vicinity of the component body.

7. An electrical component according to any one of claims 1 to 6, wherein the consistency of the material of the dip casing as regards to rheological or flow characteristics and its surface tension and the dimensions of the beads are matched to each other such that the material of the dip casing of the plug terminations extends as far as the beads and stops there so that the casing is precisely delimited.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. when dipping the components into the encapsulating or coating material it is not necessary to proceed particularly carefully with regard to the maximum permitted length of the varnished beads since the casing material only extends precisely up to the bead as a result of its consistency and surface tension is limited by it. Since the underside of the bead can be soldered these components can be used in circuit boards having two layers whereby a particularly safe solder connection is achieved. In order that the invention and its various other preferred features may be understood more easily, embodiments thereof will now be described, by way of example only, with reference to the drawings in which : * Figure 1 is a side elevation partly cut away showing a wafer-shaped component constructed in accordance with the invention having two plug connections arranged at a defined grid spacing, Figure 2 is a side elevation partly cut away showing a second embodiment of the invention in the form of a component with twelve parallel plug connections adjacent each other and, Figure 3 is an enlarged portion of a plug connection of the embodiments of Figures 1 and 2 showing details of a bead. Figure 1 shows a component 1 having a wafer-shaped component body 2 which is provided with a metal structure, for example in the form of capacitor coatings on both opposite main surfaces. Wire connecting elements 3, forming plug terminations, which are angled off at the ends are fixed to the coatings, in which connecting elements 3 beads 4 are squeezed and stamped or forged for example in the manner employed for screw or bolt heading. The beads are formed so as to extend all round the wire plug termination 3. A dip casing 5 covers the component body 2 completely and extends percisely up to the beads 4 so that the coated e.g. enamelled or varnished beads 6 (which look like trousers) have precisely defined lengths. The component 1 can be a wafer-shaped capacitor, a multi-layer capacitor, an electrical resistor, a piezo-electrical filter or other such component. When dipping the component, the consistency of dip material is chosen as regards its rheological or flow characteristics and its surface tension to match the bead dimensions such that the material of the dip casing of the plug termination extends as far as the beads and stops there so that the casing is precisely delimited. Figure 2 shows another component 1 in the form of a module equipped with twelve wire plug connections 3. Here too each plug connection 3 has a bead 4 which precisely delimits the casing 5 on the wire plug connections 3. Figure 3 shows a bead 4 the outer diameter of which is 1.5 to 3 times greater than the diameter of the plug connection 3 and its edge angle a is an acute angle. The casing 5 extends up to the edge of the bead 4 and is limited by the bead 4. The opening in the printed circuit has a smaller diameter than the outer diameter of the bead 4 so that the bead abuts the printed circuit and the material of the casing 5 does not come into contact directly with the printed circuit. Various modifications may be made to the above described arrangements. While the beads of the plug terminations projecting on one side of the component may all lie at the same height relative to the component, they may, instead, lie at different heights. WHAT WE CLAIM IS:-

1. An electrical dip insulated component having a plurality of plug terminations in the form of wires each termination having a bead with a frusto-conical surface, the beads acting to limit the insertion depth of its plug termination and delimiting the dip insulation.

8. A method of manufacturing an elec

trical component comprising the steps of attaching to the component at least one plug termination provided with a bead having a surface of frusto conical form and dipping the component into a coating medium up to the level of the bead.

9. A method according to claim 2, wherein the bead is formed with an edge angle smaller than a right angle and with its outer diameter 1.5 to 3 times the diameter of the plug termination.

10. A method according to claim 8 or 9, wherein the plug terminations on one side of the component are attached to the component with the leads all lying at the same height relative to the component.

11. A method according to claim 8 or 9, wherein the plug terminations on one side of the component are attached to the component with the leads lying at different heights relative to the component.

12. A method according to claim 8 or 9 wherein two plug terminations are attached to the component.

13. An electrical component having a plurality of plug terminations and substantially as described herein with reference to the drawings.

14. A method of manufacturing an electrical component substantially as herein described with reference to the drawings.