CN214014809U

CN214014809U - Electrical device

Info

Publication number: CN214014809U
Application number: CN202021625655.5U
Authority: CN
Inventors: 里科·维蒂格
Original assignee: Junlian Zhixing Co ltd
Current assignee: Junlian Zhixing Co ltd; Joynext GmbH
Priority date: 2019-08-09
Filing date: 2020-08-07
Publication date: 2021-08-20
Anticipated expiration: 2030-08-07
Also published as: DE102019005639A1

Abstract

The utility model relates to an electrical equipment (100), it has: a conductive housing (101) having a conductive contact dome (102) with a standoff (103); and a circuit board (105) arranged in the housing (101) and having an opening (109) with an electrically conductive plated through hole (106), wherein the circuit board (105) is placed on the support (103) such that the contact dome (102) protrudes through the opening (109), fills the opening (109) and presses against the plated through hole (106).

Description

Electrical device

Technical Field

The present invention relates to an electrical device with a contact dome and a circuit board and a method for mounting the device.

Background

Known electrical or electronic devices have circuit boards with high-frequency critical electrical or electronic circuits. The device is, for example, a receiving facility, an amplifying facility or a distributing facility used in media technology and/or in telecommunications technology. Alternatively, the device may be an infotainment device or a radio navigation device for use within or outside the vehicle.

In order to protect the circuit from electric and/or magnetic fields in the surroundings of the device, the device can have an electrically conductive housing which is electrically connected to a reference potential of the circuit.

The connection may be achieved by screwing the conductive contact surface of the circuit board to the conductive support of the housing using screws. Thereby, in addition to the electrical connection, there is also a mechanical connection of the circuit board to the housing.

Alternatively, the conductive contact springs fixed to the housing may be pressed against the conductive contact surfaces of the circuit board, or the conductive connection lines may be soldered to the housing and the circuit board. In both cases, an additional mechanical fixing of the circuit board to the housing is required.

The above-described type of connection of the housing to the circuit board requires additional components (e.g. screws, contact springs, connecting wires) and a complicated workflow which increases the cost of the device.

SUMMERY OF THE UTILITY MODEL

The object of the invention is to provide a stable mechanical and electrical connection between a circuit board of an apparatus and a housing of the apparatus at a particularly low cost.

This task is solved with an electrical device according to the invention.

The electrical device has an electrically conductive housing with an electrically conductive contact dome with a stand. The device also has a circuit board disposed in the housing and having an opening with a conductive plated through hole. The circuit board is placed on the support with the contact domes protruding through the openings, filling the openings and pressing against the plated through holes.

Since the contact dome fills the opening and presses against the plated-through hole, the contact dome is connected with the circuit board in a force-fitting manner. Thereby, there is a stable mechanical and electrical connection of the circuit board to the housing.

In addition, additional components, such as screws, contact springs or connecting wires, can be omitted. Furthermore, the connection is established in a particularly simple manner, for example by riveting the contact dome to the circuit board or pressing the contact dome into the circuit board. The connection of the housing to the circuit board is thus established at particularly low cost.

An opening is through the circuit board so that the contact dome may protrude through the opening. Thus, the opening is a hole. The opening is preferably circular in shape, and the region of the contact dome protruding through the opening is cylindrical in shape. Here, it may be a solid cylinder or a hollow cylinder. The diameter of the region is sized so that the region fits through the opening.

The longitudinal axis of the contact dome extends generally perpendicular to the plane of the circuit board. However, the longitudinal axis may also extend obliquely to the plane of the circuit board.

It should also be noted that the plated through holes may be electrically connected to a reference potential of circuitry disposed on the circuit board to achieve the desired circuit shielding. The circuit may have a plurality of electronic components, such as integrated circuits.

Alternatively, the circuit has a plug connector arranged on the circuit board, by means of which the electrical device can be connected to another electrical device. A recess may be provided in the housing for the plug connector.

In one embodiment of the device, the housing is formed integrally with the contact dome. This has the advantage that: the housing with the contact domes can be manufactured in one working step and there is no need to mount the contact domes on the housing. The housing is preferably designed as a die-cast housing.

Alternatively, the body of the housing may be made of a non-conductive material, wherein the body is covered by a conductive shielding material, e.g. a sheet metal material.

In a further embodiment of the device, the contact dome is formed wider on the side of the circuit board opposite the carrier than in the opening. For this purpose, the contact dome can have, for example, a rivet head projecting from the opening. Thereby, in addition to the force-locking connection, there is also a form-locking connection of the contact dome to the circuit board. Therefore, the mechanical connection between the circuit board and the shell is more stable. In particular, the connection cannot be released without loss thereby.

In a further embodiment of the device, the more widely formed region of the contact dome exerts a pressure on the circuit board. Thereby, there is another force-locking connection of the contact dome to the circuit board. The mechanical connection of the circuit board to the housing is thereby more stable, so that the circuit board is particularly firmly fixed to the housing.

In a further embodiment of the device, the pressure is applied to an electrically conductive contact element of the circuit board, which is arranged on the opposite side of the circuit board from the carrier. Thereby, there is an additional electrical connection of the contact dome to the circuit board. The contact elements can be designed in particular as conductor tracks surrounding the opening.

In a further embodiment of the device, the contact element is designed in the form of a ring. Whereby the stability of the additional electrical connection of the contact dome to the circuit board can be improved.

In a further embodiment of the device, the through-hole has an electrically conductive sleeve arranged in the opening, which sleeve surrounds the contact dome. This makes the electrical connection of the circuit board to the housing more reliable.

Alternatively, in addition to the contact domes, other fastening means can be provided, for example rivets, fastening pins, clamps, latching hooks, snap hooks or screws, by means of which the circuit board is fixed on the housing.

The above task can also be solved with a method for installing an electrical device according to the present invention.

In the method, the circuit board is placed on the support with the contact domes guided through the openings. Furthermore, the contact dome is widened or widened in the opening such that the contact dome fills the opening and presses against the plated through hole. For this purpose, the contact dome is pressed in the direction of the circuit board along the longitudinal axis of the contact dome. In this way, the circuit board can be riveted to the housing.

In the case of this riveting, a particularly simple and rapidly implementable process is used which requires only a simple force/displacement monitoring as process monitoring. This process can be carried out more quickly than screwing or welding, in particular. The standoff that contacts the dome serves as a base for the staking process.

In order to be able to guide the contact dome through the opening, the contact dome must be correspondingly designed or dimensioned. For example, the contact dome may have a tapered region adapted to pass through the opening. The tapered region is connected to a wider region of the shell side of the contact dome along the longitudinal axis of the contact dome, with the standoff located on the boundary between the two regions. The tapering region can be configured in particular in a cylindrical manner, wherein the diameter of the tapering region is smaller than the diameter of the opening.

In case of widening the contact dome, the contact dome is permanently deformed. In particular, the contact dome is widened or squashed. Thereby, a possible gap between the contact dome and the circuit board is closed. In this way, a gas-tight electrical connection of the circuit board to the housing is formed.

In one embodiment of the method, the circuit board is pressed onto the carrier with the contact dome widened by means of a pressing device. In other words, the circuit board is pressed against the carrier. Thereby preventing the circuit board from being removed from the support and secured in a position spaced from the support.

The above task is also solved with a method for installing an electrical device according to the present invention.

In the method, the circuit board is placed on the support by pressing the contact domes into the openings so that the contact domes fill the openings and press against the plated through holes. In this way, a gas-tight electrical connection between the circuit board and the housing is also formed.

Drawings

The invention is explained in more detail below with reference to the drawings.

Fig. 1 shows a schematic view of an electrical device according to an embodiment of the present invention.

Fig. 2 shows a cross-section through plane a: a of fig. 1.

Fig. 3 shows one of the contact domes of the electrical device of fig. 1.

Wherein: 100 electrical devices; 101 a conductive housing; 102 a conductive contact dome; 103, a support; 104 a rivet head; 105 a circuit board; 106 plating through holes; 107 plug connectors; 108 a conductive contact element; 109 are open.

Detailed Description

Referring now to fig. 1, fig. 1 shows a schematic view of an electrical device 100 according to an embodiment of the present invention. Additionally, referring to fig. 2, fig. 2 shows a cross-section through plane a: a of fig. 1.

The electrical device 100 has an electrically conductive housing 101, which is designed as a diecast housing. Wherein zinc alloy can be used as the material of the housing 101. The housing 101 is open upward, but may be closed with a housing cover (not shown).

Three conductive contact domes 102 are arranged in the housing 101, which protrude vertically upwards from the housing bottom of the housing 101. The housing 101 is formed in one piece with the contact dome 102. Alternatively, the contact dome may be constructed separately and then mounted on the bottom of the housing.

Each contact dome 102 has a lower (bottom side of the housing) wider region above which a tapered region is connected along the longitudinal axis of the contact dome 102. The transition between the wider region and the tapered region is configured as a seat.

In the housing 101, i.e. in the cavity enclosed by the housing 101, a circuit board 105 is arranged, the plane of which circuit board 105 extends parallel to the plane of the housing bottom. Three circular openings 109 are provided in the circuit board 105, which correspond to the contact domes 102 and each have an electrically conductive plated-through hole (not shown).

Additionally, the circuit board 105 has an electronic circuit (not shown) with a plurality of electronic components. Furthermore, two electrical plug connectors 107 are arranged on the circuit board 105, which are electrically connected to the electrical circuit and are used for connecting further electrical devices.

The circuit board 105 is placed on the support of the contact domes 102, wherein the tapered region of each contact dome 102 protrudes through one of the openings 109. In particular, each contact dome 102 is topped by a rivet head 104, which projects out of the associated opening 109 and is already formed when the circuit board 105 is riveted to the housing 101.

The respective rivet head 104 fills the associated opening 109 and presses in the opening 109 against the plated-through hole. Thus, there is an air-tight force-fit connection of the contact dome 102 to the circuit board 105. Furthermore, the diameter of the rivet head 104 increases towards the top, so that the contact dome 102 is formed wider above the circuit board 105 (i.e. on the side of the circuit board 105 opposite the carrier) than in the opening 109. Thus, in addition to the force-locking connection, there is also a form-locking connection of the contact dome 102 to the circuit board 105.

Referring now additionally to fig. 3, fig. 3 illustrates any one of the contact domes 102 of the electrical device of fig. 1. In particular, a rivet head 104 and a carrier 103 of the contact dome 102 are shown, wherein the carrier 103 is designed as a flange and serves as a base for placing a circuit board 105. For clarity, the circuit board 105 itself is not shown in fig. 3.

Furthermore, fig. 3 shows a plated through hole 106, which is arranged in an opening 109 of the circuit board 105, through which opening 109 the contact dome 102 protrudes. The plated through hole 106 is configured as a sleeve that surrounds the contact dome 102. The widened or widened rivet head 104 presses against the plated-through hole 106, so that a form-locking, electrically conductive connection exists between the housing 101 and the circuit board 105.

At the upper edge of the plated through hole 106, a conductive contact element 108 is connected to the plated through hole 106. The contact element 108 is annular and is arranged on the upper side of the circuit board 105, namely on the opposite side of the circuit board 105 to the carrier 103.

In the present case, the plated-through hole 106 is formed integrally with the contact element 108. Alternatively, the plated through holes 106 and the contact elements 108 may be configured independently of each other. The contact elements 108 may be, in particular, components of the electrical conductor tracks surrounding the opening 109.

A method for installing the electrical apparatus of fig. 1 is described below.

In a first method step, the circuit board 105 is inserted into the housing 101 such that it rests on the support 103 of each contact dome 102. For this purpose, the contact dome 102 is guided through an associated opening 109 of the circuit board 105.

In a first method step, the rivet head 104 of the contact dome 102 is not yet formed. Instead, the tapered region of the contact dome 102 has a cylindrical shape, wherein the cylindrical shape is a solid cylinder. Alternatively, the tapering region can be configured in the form of a hollow cylinder. The cylinder axis of the solid cylinder or the hollow cylinder coincides with the longitudinal axis of the contact dome 102.

In a second method step, each contact dome 102 is widened in the associated opening 109, so that the contact dome 102 fills the opening 109 and presses against the plated-through hole 106. For this purpose, a predetermined pressure is applied to the contact dome 102 along the longitudinal axis of the contact dome 102.

This pressure is applied by a riveting tool so that the circuit board 105 is riveted to the housing 101. This pressure causes a deformation of the contact dome 102, wherein the rivet head 104 is configured and the contact dome 102 is shortened along its longitudinal axis. In particular, the tapered region of the contact dome 102 is squeezed or widened. The riveting tool may have a punch for widening the contact dome 102.

In this way, both a force-locking connection of the circuit board 105 to the housing 101 and a form-locking connection of the circuit board 105 to the housing 101 are established, so that a particularly stable mechanical and electrical connection of the circuit board 105 to the housing 101 is present.

Alternatively, in a second method step, the circuit board 105 is pressed with a predetermined force onto the carrier 103 by means of a pressing device. Thereby preventing the circuit board 105 from being removed from the support 103 and fixed in a position spaced apart from the support 103.

Another method for mounting an electrical device according to the invention is described below. The electrical device may correspond, for example, to the device shown in fig. 1 and 2, but wherein the contact dome 102 does not have a rivet head 104.

In the method, the circuit board is inserted into the housing, wherein each contact dome is pressed with a predefined force into a corresponding opening of the circuit board. This results in: the contact dome fills the opening and presses against a plated through hole disposed in the opening. In this way, a force-locking connection of the circuit board to the housing is established in a particularly simple manner, which connection is a stable mechanical and electrical connection.

Optionally, the circuit board is additionally riveted to the housing by applying a predefined pressure to each contact dome along its longitudinal axis, wherein the rivet head of the contact dome is formed. In this way, in addition to the force-locking connection, a form-locking connection of the circuit board to the housing is also established, so that a particularly stable mechanical and electrical connection of the circuit board to the housing is provided.

Claims

1. An electrical device (100) having:

a conductive housing (101) having a conductive contact dome (102) with a standoff (103); and

a circuit board (105) arranged in the housing (101) and having an opening (109) with an electrically conductive plated-through hole (106),

characterized in that the circuit board (105) is placed on the support (103) such that the contact domes (102) protrude through the openings (109), fill the openings (109) and press against the plated through holes (106).

2. Electrical device (100) according to claim 1, characterised in that the housing (101) is constructed in one piece with the contact dome (102).

3. Electrical device (100) according to claim 1 or 2, characterised in that the contact dome (102) on the side of the circuit board (105) opposite the carrier (103) is configured wider than in the opening (109).

4. The electrical device (100) according to claim 3, wherein the wider configured area of the contact dome (102) exerts a pressure on the circuit board (105).

5. An electrical device (100) according to claim 4, characterized in that the pressure is applied to an electrically conductive contact element (108) of the circuit board (105), which is arranged on the opposite side of the circuit board (105) to the support (103).

6. The electrical device (100) according to claim 5, wherein the contact element (108) is configured in a ring shape.

7. The electrical device (100) according to claim 5, characterised in that the plated-through hole (106) is integrally formed with the contact element (108).

8. The electrical device (100) according to claim 1 or 2, wherein the plated through hole (106) has an electrically conductive sleeve arranged in the opening (109), the electrically conductive sleeve surrounding the contact dome (102).

9. An electrical appliance (100) as claimed in claim 1, characterized in that an electrical plug connector (107) is arranged on the circuit board (105) for connecting to another electrical appliance.

10. The electrical device (100) of claim 1, wherein the contact dome (102) has a rivet head (104) protruding from the opening (109), the rivet head (104) filling the opening (109) and pressing against the plated through hole (106).