WO2011064105A1

WO2011064105A1 - Method for contacting a printed circuit board with a ribbon cable and printed circuit board

Info

Publication number: WO2011064105A1
Application number: PCT/EP2010/067348
Authority: WO
Inventors: Thomas Donauer; David Dussault; Harald Stoyan
Original assignee: Osram Gesellschaft mit beschränkter Haftung
Priority date: 2009-11-26
Filing date: 2010-11-12
Publication date: 2011-06-03
Also published as: DE102009055857A1

Abstract

The invention relates to a method for contacting a printed circuit board (1) provided with contacts (8a-8d) with at least one ribbon cable (10a, 10b) having in each case at least one core (11), at least a part of the contacts (8a-8d) being directly connected to a core (11). The printed circuit board (1) is equipped with several contacts (8a-8d), at least one of the contacts (8a-8d) being electrically connected to at least one core (11) of a ribbon cable (10a, 10b), wherein the at least one contact (8a-8d) is further directly connected to a core (11).

Description

description

Method for contacting a printed circuit board with a ribbon cable and printed circuit board

The invention relates to a method for contacting a printed circuit board provided with contacts with a Flachbandka ^¬ bel with at least one core. The invention further relates to a printed circuit board with a plurality of electrical contacts, wherein at least one of the contacts is electrically connected to at least one core of a ribbon cable.

There are known circuit boards which are equipped on one side with at least ^¬ least one connection element, for example a socket to be contacted by means of a ribbon cable, for example egg ^¬ ner ribbon cable. The ribbon cable has for this purpose the complementary plug connection counter element, for example a ZIF plug or LIF plug. Thus, flexible, band-shaped and one-sided equipped with LEDs ^¬ te printed circuit boards (LED light strips) are known, which in each case have a ZIF socket on one side in a region of longitudinal ends of the circuit board. On the other, not equipped or printed side, the circuit board is equipped with a double-sided adhesive tape for mounting the LED light strip. Such LED light strips are known, for example, from the LINEARLight LMXX series from Osram. The LED light strips can be electrically contacted by attaching a one-sided contacted connector to the electrical contacts, for example, be connected to a power source or a wide ^¬ res LED light strip. Such a connector may be a ZIF (Zero Insertion Force) connector from the LM series of connectors from Osram, which fits on the LED light strips of the LINEARLight LMXX series.

However, these light strips have the disadvantage that the base and plug a not negligible height have, which may be particularly detrimental to a laying of light strips. Furthermore, a plug contact may fail in a curved laying of flexible printed circuit boards. In addition, use with rear-mountable printed circuit boards is practically impossible.

It is the object of the present invention at least partially to obviate the above mentioned drawbacks and in particular ^¬ sondere a possibility for a compact and distract under bending runanfälligen contacting of circuit boards, especially flexible and / or on both sides contacted, printed circuit boards provide.

This object is achieved according to the features of the independent claims. Preferred embodiments are insbesonde ^¬ re the dependent claims.

The object is achieved by a method for contacting a printed circuit board provided with (electrical) contacts with at least one ribbon cable, each having at least one (electrical) wire, wherein at least a portion of the contacts is connected directly to an associated wire. Under a direct connection, an electrical and mechanical connection means, in particular, which is produced without via an intermediate member such as a plug-in connection element ^(¬ post connectors, etc.) or an insulation displacement connector.

The direct connection bypassing the Zwischenele- ments a minimum height is achievable, since the contacts of the circuit board and the conductors of the ribbon cable in Wesent ^¬ union directly adjoin one another. The overall height is so low that even a rear attachment to a back-attachable, eg glued, PCB is possible without significant loss of liability. In addition, a flexible printed circuit board and the ribbon cable can now be laid safely ^curved . It is an embodiment that the circuit board is provided on both sides with contacts, wherein the contacts of the two sides are connected to at least one respective wire of a ribbon cable. As a result, the number of contacts limited by the width of the printed circuit board can be increased by inexpensive and störunanfällige ribbon cable. Also, a wiring layout can be simplified. The printed circuit board can have a wiring on both sides and / or be equipped on one or both sides with electronic components (such as LEDs). Alternatively, the circuit board can be contacted at its rear side and possibly be ^¬ Wire the tet and be provided with this back side for fastening, for example by providing a double-sided adhesive tape.

In this case, the contacts of the two sides can each be at least partially connected by means of at least one core of a same or a respective ribbon cable. In other words, the contacts on different sides of the circuit board can be connected to different ribbon cables. As a result, different connection points can be arranged geometrically versatile to each other. Alternatively or additionally, a ribbon cable may also contact contacts on both sides of the circuit board, e.g. by splitting the ribbon cable.

It is a further embodiment that the ribbon cable is a flat cable ('Fiat Flex Cable', FFC). The ribbon cable is a design that uses no strand, but on eg polyester applied metal tracks whose exposed ends are previously intended to be plugged directly to designated connector. The ribbon cable has the advantage that it is particularly thin and lightweight. It is a further embodiment that the printed circuit board is a flexible printed circuit board. The flexible printed circuit board and the ribbon cable can be routed safely curved. It is also an embodiment that the circuit board is a band-shaped circuit board. In this case, a ribbon cable can have an approximately equal form factor (in particular a same width) as the printed circuit board and can be routed at least as easily as curved.

It is an embodiment that the at least one ribbon cable is connected to contacts that are in Be ^¬ rich at least one longitudinal end of a band-shaped circuit board.

It is also an embodiment that at least one of the at least one contacts is connected to the at least one core by means of a surface mount technology (SMT).

It is an additional or alternative embodiment, that at least one of the at least one contacts of the circuit board by means of a bracket ^¬ soldering (also known as 'hot bar' brazing ^¬ be distinguished) with the at least one lead of the is connected to at least one ribbon cable. This is especially easy to do.

It is still an embodiment that located on unterschiedli ^¬ Chen sides, opposite contacts of the printed circuit board are connected simultaneously with corresponding wires. Thereby, the two sides can be connected by means of a common connection process.

The object is also achieved by a printed circuit board with a plurality of (electrical) contacts, wherein at least one of the contacts with at least one (electrical) wire of a Ribbon cable is electrically connected, wherein the mindes ^¬ least one contact is directly connected to a wire.

The printed circuit board may in particular be a flexible, in particular double-sided contactable, printed circuit board and the at least one ribbon cable comprise at least one Flachbandlei ^¬ tion, wherein at least one contact of the flexible printed circuit board and at least one wire of the ribbon cable are connected by means of a surface mounting connection or by means of a Bügellötverbindung in particular by different ribbon cables for contacts of the circuit board on different sides.

It is a development that the circuit board is provided on both sides with contacts, wherein the contacts of the two sides are connected to at least one respective vein of a ribbon cable.

It is still a development that the ribbon cable is a ribbon cable.

It is also a development that the circuit board is a flexible circuit board. It is also a development that the circuit board is a band-shaped circuit board. It is an embodiment that the at least one ribbon cable is connected to at least one longitudinal end of a band-shaped circuit board.

It is also a development that at least one of the at least one contact is connected by means of a surface mounting connection with the at least one core.

It is an additional or alternative embodiment that at least one of the at least one contacts by means of a Ironing connection is connected to the at least one core. This is especially easy to do.

It is generally possible for a simple and secure connection of the contacts and the wires possible configuration that at least ^¬ a group of contacts of the circuit board and a ribbon cable to be connected has the same seitli ^¬ chen distance between two adjacent electrical lines (cores and contacts) , Thus, multiple wires of the ribbon cable can be brought by a simple positioning process to the correspondingly spaced contacts of the circuit board.

The printed circuit board can generally be fitted on one or both sides, in particular with at least one light source, in particular at least one light-emitting diode. The circuit board can then be designed as a lighting device, in particular LED lighting device. In general, the contacts of a page can be contacted by means of one or more ribbon cables. The contacts ei ^¬ ner circuit board can be divided into a contact for gleicharti ^¬ ge groups of contacts or differently formed groups of contacts. Thus, at least two groups of contacts, which are each provided for contacting by means of a ribbon cable, kör ^¬ perlich be designed the same (eg with respect to a contact distance between two adjacent contacts) and thus contacted by means of the same ribbon cable. Alternatively or additionally, at least two groups of contacts may be physically different.

In the following figures, the invention will be described schematically with reference to exemplary embodiments. Identical or identically acting Ele ^¬ elements may be provided with the same reference numerals for clarity. Fig.l shows a sectional side view of a printed circuit board in a first connection configuration;

2 shows in a view along a Längserstre ^¬ ckung the printed circuit board on a longitudinal side end of the PCB.

Fig.l shows, as a sectional side view of a designed as a light band, stocked and flexible and band-shaped printed circuit board 1. A front face 2 of the board 1 is provided with LEDs 3 and possibly other electric ^¬ African components such as integrated components, resistors, capacitors, etc. equipped. For wiring the light-emitting diodes 3 and the other electronic components, the printed circuit board 1 is provided on its front side 2 with a wiring 4 (printed conductors, contact surfaces, etc.), in particular printed. In order to realize even more complex wiring patterns, the printed circuit board 1 is also provided on its rear side 5 with a wiring 6 (in particular conductor tracks), for example printed, but not equipped with components. The wiring 6 of the back 5 is electrically connected to the light-emitting diode ^¬ 3, with the components and / or wiring 4 of the front panel 2 through the circuit board 1 through, for example, by means of corresponding plated- through tierungen (o.Abb.).

For contacting the printed circuit board 1 for power supply and possibly also for data transmission, the wirings 4, 6 at the two longitudinal ends 7 of the printed circuit board 1 are designed as electrical contacts 8a-8d with respect to the front-side wiring 4 on the front side 2 as a first group of contacts 8a at one of the longitudinal ends 7 and as a second group of contacts 8b at the other of the longitudinal ends 7 and the back wiring 6 as a third group of contacts 8c at the one of the longitudinal ends 7 and as a fourth group of Contacts 8d at the other of the long-side ends 7. The contacts 8a and 8c are to Contacts 8b and 8d constructed and connected the same, ie, that the two longitudinal ends 7 in particular have a same ^¬ che Anschlußusscharakteristik. It is therefore irrelevant for an operation of the circuit board 1 or the light band, whether the contacts 8a or 8b or the contacts 8c or 8d are ^¬ closed.

For contacting the printed circuit board 1, a first ribbon cable in the form of a ribbon cable 10a is connected to the first group of contacts 8a at the longitudinal end 7 of the printed circuit board 1 shown here on the left, in particular by ironing or by surface mounting technology. Similarly, a second ribbon cable 10b is connected to the third group of contacts 8c. The contacts 8b and 8d of the right side end 7 shown on the right are not connected, but may be connected thereto if necessary, on one or both sides.

By this arrangement, there is the advantage that even a two-sided circuit board 1 with a limited width b (see Figure 2) for the arrangement of the contacts 8a-8d can be complex, since both the front 2 and the back 5 for contacting and in accordance with twice as many contacts 8a-8d can be used, even if the circuit board 1 can be fastened to the back 5. The groups of contacts 8a, 8b and 8c, 8d mounted on different sides 2, 5 can also be present on a via only for the purpose of having both groups of contacts 8a, 8b and 8c, 8d on one side 2, 5 to be omitted; This also simplifies a layout of the Ver ^¬ wiring 4, 6 and the circuit board 1. The ribbon cable and the direct connection to the circuit board 1 are so thin that the circuit board can be attached back without a significant high Standing its rear side 5 on the rear side, eg by means of a double-sided adhesive tape. The contacts 8a, 8b and 8c, 8d are the same structure and wired, so that it does not matter for the operation of the circuit board 1, to which of the ends 7 the Flachbandlei ^¬ lines 10a, 10b are contacted.

2 shows in a view along a longitudinal extent of the printed circuit board 1 on a longitudinal end 7 or on an end or front side surface 9, the circuit board 1 with the contacts 8a and 8c and 8b and 8d. The contacts 8a-8d are here equally spaced from each other with a Kon ^¬ pitch p arranged. With the contacts 8a and 8c respectively the corresponding wires 11 of the ribbon cable 10a, 10b are connected, wherein the wires 11 have the same contact distance p.

Alternatively, the ribbon cables 10a and 10b may also be attached to opposite ends 7, e.g. For example, the second ribbon cable 10b may be connected to the fourth group of contacts 8d, or one, three or each of the group of contacts 8a to 8d may be connected to a ribbon cable.

Of course, the present invention is not limited to the embodiments shown.

So the number of contacts, the groups of contacts, the ribbon cable and the number of wires of the ribbon cables is not limited.

LIST OF REFERENCE NUMBERS

1 circuit board

2 front of the circuit board

3 LED

4 front wiring

5 Back of the circuit board

6 back wiring

7 long-side end

8a Contacts of a first group of contacts

8b contacts a second group of contacts

8c contacts a third group of contacts

8d contacts a fourth group of contacts

9 front side surface of the circuit board

10a first ribbon cable

10b second ribbon cable

11 core

b Width of the circuit board

P contact distance

Claims

claims

1. A method for contacting a printed circuit board (8a-8d) provided with at least one ribbon ^¬ cable (10a, 10b), each having at least one core (11), characterized in that at least a portion of the Kon ^¬ clocks (8a-8d ) is directly connected to a wire (11).

2. The method of claim 1, wherein the circuit board (1) on both sides (2, 5) with contacts (8a-8d) is provided, wherein the contacts (8a-8d) of the two sides (2, 5) of the circuit board ( 1) with at least one respective core (11) of a ribbon cable (10 a, 10 b) are connected.

3. The method according to any one of the preceding claims, wherein the ribbon cable (10a, 10b) is a ribbon cable.

4. The method according to any one of the preceding claims, wherein the printed circuit board (1) is a flexible printed circuit board.

5. The method according to any one of the preceding claims, wherein the printed circuit board (1) is a band-shaped printed circuit board.

6. The method according to any one of the preceding claims, wherein the at least one of the contacts (8a-8d) is connected by ei ^¬ ner surface mounting technology with the at least one core (11).

7. The method according to any one of the preceding claims, wherein the at least one contact (8a-8d) is connected by means Bügellö ^¬ least with the at least one core (11).

8. The method according to any one of claims 2 to 7, in which located on different sides, opposite ing contacts (8a, 8c, 8b, 8d) of the circuit board at the same ^¬ time with corresponding wires (11) are connected.

9. printed circuit board (1) with a plurality of contacts (8a-8d), in particular ^¬ special with at least one light emitting diode (3) populated printed circuit board (1), wherein at least one of the contacts (8a-8d) with at least one core (11) of a ribbon ^¬ cable (10a, 10b) is electrically connected, characterized in that the at least one contact (8a-8d) is directly connected to a wire (11).

10. Printed circuit board (1) according to claim 9, characterized in that the printed circuit board (1) is a flexible ^{Leiterplat ¬} te and the ribbon cable (10a, 10b) is a ribbon ^¬ line, wherein at least one contact of the flexible printed circuit board (1) and at least one core (11) of the ribbon cable (10a, 10b) are connected by means of a surface mounting connection or by means of an ironing connection.