DE102009008095A1 - Ready-to-use light strip - Google Patents

Abstract

The light strip (7) has at least one strip-shaped unit printed circuit board (8), the unit printed circuit board (8) each having at least one semiconductor light source (4), in particular light emitting diode, equipped and at its two end portions each electrical contacts (9, 10) for electrical Supply, wherein the unit circuit board (8) has a with the at least one semiconductor light source (4) equipped luminous portion (11) and at least one of the luminous portion (11) adjoining, detachable contact portion (12), wherein the luminous portion (11) at its two End regions each having electrical contacts (10) to its electrical supply and wherein electrical contacts (9) of the at least one contact portion (12) and the electrical contacts (10) of the respective contact portion (12) adjacent end portion of the luminous portion (11) connected to each other are.

Description

The The invention relates to a tailorable light strip and method for assembling light strips.

It are known quasi-endless LED light strips, from a coherent one Sequence of band-shaped Unit boards or unit board sections exist and at specified intervals between two unit PCBs can be separated, z. B. every 200 mm. Such light bands are for example from the LINEARLight series of the FA. OSRAM known. A separation at other than the predetermined intervals between the unit printed circuit boards (ie a separation of a unit board) would be too an interruption of the circuit and thus to the destruction of the Lead LED bands. For some However, applications are required other than the fixed tape lengths, For example, to lay the LED tape accurately in a corner can. Another problem with the tailor-made assembly of LED strips is in that an extension a luminous band by mating two unit PCBs by means of a connector with an enlargement of the Distance between the LEDs arranged on both sides of the plug connected is; this in turn leads at an uneven distance between the light-emitting diodes.

It It is the object of the present invention to provide a simple to implement possibility to provide for more precise assembly of light bands.

These Task is by means of a light strip and method of assembly of light bands according to the respective independent claim solved. Advantageous embodiments are in particular the dependent claims.

The Luminous band has at least one band-shaped unit printed circuit board on, wherein the unit board each with at least one Semiconductor light source equipped is and at its two end portions each electrical contacts for electrical supply, wherein the unit board a with the at least one semiconductor light source equipped lighting section and at least one adjoining the luminous section, detachable contact portion, wherein the luminous portion on its two end regions each electrical contacts to his having electrical supply and wherein electrical contacts the at least one contact section and the electrical contacts of the at the respective contact portion adjacent end portion of the luminous portion connected to each other. The semiconductor light source can advantageously have a light emitting diode, but z. B. also a laser diode.

Thereby may be a unitary board (or equivalent unit board section) by separating the contact section simply by the length of the Contact section shortened be in bilateral presence also by the length of two contact sections. Since the contact sections not with the Semiconductor LEDs equipped can be a separation without loss of function for the light strip or the light section can be easily implemented. Especially can be a contact portion advantageously only Leiterbah NEN and contact surfaces have and no electrical or electronic components like integrated components. The separation can be done, for example, by cutting or scratches and breakages are accomplished. The circuit board can, inter alia, for laying the light strip on curved surfaces advantageously be flexible ('flexband').

to Achieving one as possible extensive length shortening can at least one unit board at both ends of the luminous portion each having a contact portion. However, the invention is not limited to and a unit board may also have a contact portion only on one side exhibit. Also like the unit PCB on one side or on both sides of several subsequent to the luminous section contact sections have, whereby a particularly fine packaging is possible.

advantageously, can be a length the at least one located between two light sections Contact section a distance between two connected via a plug Corresponding lighting sections. This can be an insertion of a plug length-related in the light strip or between two light sections be accomplished neutral by removing corresponding contact sections.

advantageously, can the contacts of the at least one contact section and the contacts of the adjacent to the respective contact portion end of the Light section over a back Wiring to be interconnected. Here 'back' means an arrangement on that side ('Back'), which with the the at least one semiconductor head light source equipped side ('front') facing away. This makes a position of front-side contacts better recognizable and thus a separation of the contact section to the Contacts of the light section easier.

The contacts of the at least one contact section and the contacts of the adjacent to the respective contact portion end portion of the luminous portion can be advantageously carried out but also as a continuous conductor track. This embodiment is particularly simple to manufacture and requires z. B. no vias.

The Contacts can be designed advantageously symmetrical, d. h., that she independently from the orientation of the plug. This will cause a reverse polarity prevented. In particular, you can the contacts advantageously mirror-symmetrical with respect to a longitudinal axis the circuit board objectively be arranged. The contacts can advantageously in terms of a longitudinal axis the printed circuit board also mirror-symmetrically occupied with a potential be.

advantageously, For example, the lighting section may include a control circuit and a plurality of the control circuit having in series downstream semiconductor light sources, wherein at least one of the semiconductor light sources associated with a set of bridging contacts is in their bridging a Circuit behind this semiconductor light source is closed. As a result, the respect the control circuit electrically behind the bridging contacts lying electrical or electronic components are no longer supplied with electricity. In particular, then the light section behind the bridging contacts be separated without destroying the light strip. Bridging the bypass contacts and disconnecting The behind the part of the light strip can easily on site carried out be, for. B. by an installation expert.

to particularly simple and trouble-free assembly can advantageously at least one set of bypass contacts SMD contacts exhibit. A bridging can then advantageously by a mounting of surface mount resistors (SMD ( "Surface Mounted Device ") - resistors) happen.

The Method for assembling such a luminous band has at least Take the following step: Separate at least one contact section from a luminous portion of a unit board. As a result, as stated above, a particularly fine packaging can be achieved.

advantageously, For example, the method may also include the step of connecting the luminous portion having a contact portion or a luminous portion another unit PCB. This can in particular a Length of a connecting element, z. B. a plug, at least partially offset.

advantageously, the process may have at least the following steps: Separating a contact portion from a luminous portion of a first unit circuit board; Separating a contact section from a luminous portion of a second unit printed circuit board and connecting the Leuchtab sections of the first unit board and the second Unit PCB, z. B. by means of a connecting element such as a plug. This also can in particular a length of a Connecting element, for. B. a plug, at least partially balanced become.

Especially for making up a luminous band at its end by dicing also the lighting section, the method can advantageously have at least the following steps: cutting one Luminous section behind a set of bridging contacts and bridging the bridging contacts by means of at least one resistor. In particular, the bridging a equip the associated bridging contacts by means of at least one SMD resistor include.

In The following figures illustrate the invention with reference to exemplary embodiments described in more detail schematically. It can for better clarity identical or equivalent elements with the same reference numerals be provided.

1 shows in plan view of a conventional light strip of two cohesively produced unit circuit boards;

2 shows the light strip 1 after separation of the unit boards and subsequent assembly by means of a plug;

3 shows in plan view a luminous band of two interconnected unitary circuit boards according to a first embodiment of the invention;

4 shows the light strip 3 after separation of the unit boards and subsequent assembly by means of a plug;

5 shows in plan view a light strip of two integrally produced unit circuit boards according to a second embodiment of the invention;

6 shows in the two subfigures 6A and 6B in each case a section of a terminal region of a contact section or of a luminous section of a unit printed circuit board according to the invention with differently loaded contacts th;

7 shows in plan view a unit printed circuit board according to a third embodiment of the invention; and

8th shows a possible circuit diagram of the unit board 7 ,

1 shows in supervision a conventional flexible light strip 1 for example, two contiguous identical unit boards 2 , Each of the unit boards 2 has a flexible substrate 3 made of polyimide, whose front visible here with four LEDs 4 is equipped. The light-emitting diodes 4 are with respect to a longitudinal direction of the unit board 2 evenly spaced (equidistant) positioned. At both end portions (seen in the longitudinal direction), each of the unitary circuit boards 2 electrical contacts 5 , here: two contacts each 5 , on.

In the production of the illuminated strip 1 become the unit boards 2 made integrally, the substrates 3 the unit circuit boards 2 as a single, one-piece quasi-endless substrate of the luminous band 1 available. Likewise, the adjacent contacts 5 two adjacent unit boards 2 as a single contact strip which extends over both unitary circuit boards 2 draws.

To separate the illuminated strip 1 This can, as indicated by the scissors symbolically, be separated along a dividing line T. So that a separation of the illuminated strip 1 not to a power interruption of all unit boards 2 leads, hang the unit boards 2 electrically parallel. In a separation, therefore, only those unit circuit boards 2 cut off from a power supply, which from a -. B. external - electrical supply source can be separated. However, a separation between light emitting diodes leads 4 a unitary board 2 to that all light-emitting diodes 4 this unit board 2 fail, as the light-emitting diodes 4 a unitary board 2 are electrically connected in series.

2 shows the light strip 1 out 1 after a separation of the unit boards 2 along the dividing line T and a subsequent assembly by means of a plug 6 , The plug 6 connects the opposite contacts 5 and causes, among other things, that the two unit PCBs 2 now one through the plug 6 have certain distance d to each other. As a result, the distance between the two is relative to the plug 6 opposite light emitting diodes 4a increased by d, so that the light-emitting diodes 4 of the luminous band 1 are no longer evenly spaced.

3 shows in supervision a light strip 7 from two cohesively produced unit circuit boards 8th according to a first embodiment of the invention. Unlike the in 1 and 2 shown conventional embodiment, each unit board 8th now at each end region two spaced apart in the longitudinal direction L, identical sets of contacts 9 respectively. 10 on. Here are the contacts 9 . 10 connected via rear electrical connections. The outer contacts 9 Thus, as an electrical extension of the inner contacts 10 be considered. The two unit PCBs 8th can be separated as before along a dividing line T from each other. However, in order additionally to compensate for the distance d, which occurs when connecting two unit circuit boards 8th by means of the plug 6 results, the unit boards can 8th also on the inner contacts 10 be separated along a dividing line S. This results in a structure of the unit circuit boards 8th which have a functional layout in each case a luminous section 11 and on both sides thereof each a contact section 12 equivalent. A contact section 12 can thus from the central illumination section 11 be separated along a dividing line S. While at the light section 11 all light-emitting diodes 4 and possible further electrical or electronic switching elements such as transistors and / or resistors are mounted, has a contact portion 12 only the outer contacts 8th as well as electrical connecting lines (not shown) to the inner contacts 8th on. A contact section 12 thus serves only to extend contacts. The unit board 8th with the light section 11 and the two contact sections 12 is the same length as the conventional unit board 1 and like this one is initially made in a quasi-endless process.

4 shows the light strip 7 out 3 after a separation of the unit boards 8th and following assembly by means of the plug 6 , In contrast to a separation along the dividing line T, the two contact sections now become 12 removed, in place of the plug 6 should occur. These are the unit PCBs 8th separated at their contiguous end respectively along the dividing line S and via their inner contacts 10 , the contacts of the light section 11 match, over the plug 6 connected with each other. In the example shown, a length of the contact sections 12 about d / 2, so that by removing two contact sections 12 the light strip 7 shortened by the length it passes through the plug 6 is extended. Overall, therefore, the length of the luminous band remains 7 constant and thus the distance between the LEDs 4 . 4a , For assembly, the light strip 7 continue between the unit boards 8th be divided along the dividing line T and then z. B. with of the plug 6 be extended by a length d, or the light strip 7 can between the unit boards 8th by a length d / 2 by means of a separation of only one contact section 12 by separating along a dividing line S and a dividing line T and then inserting the plug 6 be extended.

5 shows in supervision a light strip 13 from two cohesively produced unit circuit boards 14 according to a second embodiment of the invention. In contrast to the first embodiment of the invention 3 and 4 are the unit boards 14 now executed so that the (inner) contacts 10 and the (outer) contacts 9 two adjacent unit boards 14 as continuous conductive bands 9 . 10 are designed as shown. This allows a particularly simple production and a particularly variable length adjustment, since the contact sections 15 can be separated at any point between the two outermost dividing lines S and thus as contact sections 15 variable length can be considered.

6 shows in the two subfigures 6A and 6B in each case a section of a terminal region of a contact section or a luminous section of a unit circuit board according to the invention 16 with differently assigned contacts 17 a certain set of contacts. The contacts 17 are objective and with respect to their occupancy with an electric potential (indicated here by the symbols '+' and '-' indicated) to the longitudinal axis arranged symmetrically, so that a polarity reversal can be prevented when using a plug.

7 shows in supervision a unit board 18 according to a third embodiment of the invention. Unlike the unit board 8th The first embodiment of the invention is now in each case between two light-emitting diodes 4 of the light section 19 a pair of bridging contacts 20 arranged in the form of solder fields. Each of the pairs of bridging contacts 20 For example, it can be bridged by soldering on a surface-mountable resistor (not shown). By this arrangement can now also a luminous section 19 between two LEDs 4 be severed, for. B. along a dividing line U, more specifically between a pair of bridging contacts 20 and the electrically downstream, here: further right, arranged light emitting diode 4 ,

8th shows a possible circuit diagram of the unit board 18 out 7 , At one, here left end, is the luminous section 19 with a control circuit 21 equipped, which has two transistors Q1, Q2 and two resistors R1, R2. The control circuit 21 is about the contacts 9 and or 10 connected to an electrical supply (not shown). The control circuit 21 are the light-emitting diodes 4 electrically connected in series. Will the light section 19 without further action along the dividing lines U 7 cuts, the circuit of this light section 19 interrupted, causing all light-emitting diodes 4 would not light up anymore. By electrically bridging a pair of bridging contacts 20 by means of a respective bridging resistor R3, R4 and R5, the circuit before (with respect to the control circuit 21 ) the bridging contacts 20 be closed again, whereby the then closed again part of the circuit existing light-emitting diodes 4 can shine. Since power is to be dissipated via the bridging resistors R3, R4, R5, an advantageous size of at least 0603 (inch code, 1608 in the metric code), 0805 (inch code, 2012 in the metric code) or in particular for SMD resistors 1206 (inch code, 3216 in metric code) preferred. In a substantially resistanceless bridging would be on the still powered LEDs 4 too low a voltage drop occur.

Of course, the present invention is not limited to the embodiments shown. Thus, to prevent reverse polarity, a set of contacts may also have more than three contacts. Also, a contact portion may be provided only on one side of a luminous portion. In general, features of the various embodiments can also be used in other combinations, e.g. B. the configuration of the contacts of the second embodiment with the embodiment of the luminous portion of the third embodiment or in 6 shown embodiment of the contacts with the other unit circuit boards.

1

light strip

2

Unit board

3

substratum

4

led

5

Contact

6

plug

7

light strip

8th

Unit board

9

external contact

10

internal Contact

11

luminous portion

12

Contact section

13

light strip

14

Unit board

15

Contact section

16

Unit board

17

Contact

18

Unit board

19

luminous portion

20

bridging contact

21

control circuit

d

distance

L

longitudinal axis

Q

transistor

R

resistance

S

parting line

T

parting line

U

parting line

Claims (13)

Light strip ( 7 ; 13 ) with at least one band-shaped unit printed circuit board ( 8th ; 14 ; 16 ; 18 ), the unit board ( 8th ; 14 ; 16 ; 18 ) each having at least one semiconductor light source ( 4 ), in particular light-emitting diode, is equipped and at its two end regions in each case electrical contacts ( 9 . 10 ; 17 ), wherein the unit board ( 8th ; 14 ; 16 ; 18 ) one with the at least one semiconductor light source ( 4 ) equipped lighting section ( 11 ; 19 ) and at least one of the luminous portion ( 11 ; 19 ) subsequent detachable contact section ( 12 ; 15 ), wherein the luminous portion ( 11 ; 19 ) at its two end regions each electrical contacts ( 10 ) to its electrical supply and wherein electrical contacts ( 9 ) of the at least one contact section ( 12 ; 15 ) and the electrical contacts ( 10 ) to the respective contact section ( 12 ; 15 ) adjacent end portion of the luminous portion ( 11 ; 19 ) are interconnected. Light strip ( 7 ; 13 ) according to claim 1, wherein at least one unit board ( 8th ; 14 ; 16 ; 18 ) at both ends of the luminous section ( 11 ; 19 ) each have a contact section ( 12 ; 15 ) having. Light strip ( 7 ; 13 ) according to one of claims 1 or 2, wherein a length of the at least one between two light sections ( 11 ; 19 ) contact section ( 12 ; 15 ) a distance (d) of two via a connecting element, in particular plug ( 6 ), connected lighting sections ( 11 ; 19 ) corresponds. Light strip ( 7 ) according to one of the preceding claims, in which the contacts ( 9 ; 17 ) of the at least one contact section ( 12 ) and the contacts ( 10 ; 17 ) to the respective contact section ( 12 ; 15 ) adjacent end portion of the luminous portion ( 11 ) are connected to each other via a back wiring. Light strip ( 13 ) according to one of claims 1 to 3, in which the contacts ( 9 ; 17 ) of the at least one contact section ( 15 ) and the contacts ( 10 ; 17 ) to the respective contact section ( 15 ) adjacent end portion of the luminous portion ( 11 ) are designed as a continuous conductor track. Light strip ( 7 ; 13 ) according to one of the preceding claims, in which the contacts ( 17 ) are designed symmetrically. Light strip ( 7 ; 13 ) according to one of the preceding claims, in which the luminous portion ( 11 ; 19 ) a control circuit ( 21 ) and several of the control circuit ( 21 ) in series downstream semiconductor light sources ( 4 ), wherein at least one of the semiconductor light sources ( 4 ) a set of bridging contacts ( 20 ) is bridged, a circuit behind this semiconductor light source ( 4 ) is closed. Light strip ( 7 ; 13 ) according to claim 7, wherein at least one set of bridging contacts ( 20 ) Has SMD contacts. Method for assembling a light strip ( 7 ; 13 ) according to one of the preceding claims, which comprises at least the following step: - separating at least one contact section ( 12 ; 15 ) of a light section ( 11 ; 19 ) of a unitary board ( 8th ; 14 ; 16 ; 18 ). Method according to claim 9, comprising the following step: - connecting the luminous section ( 11 ; 19 ) with a contact section ( 12 ; 15 ) or a light section ( 11 ; 19 ) of another unit board ( 8th ; 14 ; 16 ; 18 ). Method according to Claim 10 for assembling a luminous band ( 7 ; 13 ) according to claim 2, comprising at least the following steps: - separating a contact section ( 12 ; 15 ) of a light section ( 11 ; 19 ) a first unit board ( 8th ; 14 ; 16 ; 18 ); - separating a contact section ( 12 ; 15 ) of a light section ( 11 ; 19 ) a second unit board ( 8th ; 14 ; 16 ; 18 ) and - connecting the luminous sections ( 11 ; 19 ) of the first unit PCB ( 8th ; 14 ; 16 ; 18 ) and the second unit board ( 8th ; 14 ; 16 ; 18 ). Method, in particular according to one of claims 10 or 11, for assembling a luminous band ( 7 ; 13 ) according to one of claims 7 or 8, comprising at least the following steps: - cutting through a luminous section ( 11 ; 19 ) behind a set of bridging contacts ( 20 ); and - bridging the bridging contacts ( 20 ) With at least one resistor (R3, R4, R5). The method of claim 12, wherein the bridging step comprises populating the bridging contacts ( 20 ) by means of at least one SMD resistor (R3, R4, R5).