DE102008025182A1 - Lighting element i.e. office lamp, has protective layer made of electrically isolating material and applied on main side of carrier substrate, where protective layer covers all energized parts and cord grip - Google Patents

Abstract

The element has a carrier substrate (2) with a conductive power connection path. A high voltage LED (4) is arranged on a main side of the substrate, and is conductively connected with the path. A power cable (6) is conductively connected with the path, and has a cod grip at an end region (8) adjacent to the conductive connection with the path of the carrier substrate. A protective layer made of electrically isolating material e.g. silicon, is applied on the main side of the carrier substrate, where the protective layer covers all energized parts and the cord grip. An independent claim is also included for a method for manufacturing a lighting element.

Description

The The present invention relates to a luminous element for generating of light and in particular with it, like a lighting element with little Cost-effective components and can be efficiently manufactured to a versatile light-emitting element to preserve all the requirements for active and passive safety does justice.

lamps, or lighting or lighting elements are in great variety and variation offered on the market. In doing so, the individual, below As lighting elements called lighting devices a variety meet requirements. These are on the one hand economic, d. H. their production and operation should be possible as cheaply as possible. On the other hand, the lighting elements, as they naturally with electricity operated, a high security requirement, so that even at a possible Incorrect operation the risk of electric shock or electric shock preferably is low.

The Insertion of lighting elements in these surrounding housing is possibly desirable from a safety point of view, however, often undesirable for economic reasons. This can greatly increase production costs, making them even more as double the for the actual light-generating element costs incurred can. Furthermore, such solutions are often can only be used with less flexibility, since this is due to of the additional housing a larger volume and thus the installation or use options limited are.

It is therefore desirable To develop lighting elements that are produced inexpensively and efficiently and can be operated as well as the Requirements for operational safety are sufficient.

This Desire, or the fulfillment This desire underlying this task is a luminous element according to claim 1 and by a method for producing a luminous element according to claim 17 solved.

According to one embodiment The present invention is a the requirements Equivalent lighting element by a carrier substrate and a high-voltage LED (hereinafter also as LED). In this case, the carrier substrate has a conductive power connection path, which is electrically connected to the LED, which in turn on a main side of the carrier substrate is arranged. This can be, for example, the page with the largest geometric Extension. A power cable is conductively connected to the power connection path and indicates to the conductive one Connection to the power connection path of the carrier substrate adjacent end portion a strain relief on. In order to meet the requirements for operational safety, also with regard to leakage currents or electrical short circuits, To cope with, is on the main side of the carrier substrate, a protective layer made of electrically insulating material, wherein the protective layer all live Parts and the strain relief covered.

Thereby can be prevented that possibly by contacting the high-voltage LED with the power connection path exposed electric conductive components during operation touched or otherwise contacted can be so that a short circuit can be prevented.

at Use of a high-voltage LED is the lighting element not only cost-effective in production, but also in operation, since the light output at LEDs of conventional bulbs, such as light bulbs, far superior is. In alternative embodiments is not only the main page, but the entire carrier substrate encased by the protective layer. This can be beneficial in production have, since then the carrier substrate only has to be immersed in the material of the protective layer.

at Using a carrier substrate can over it In addition, the number of on the carrier substrate mounted LEDs approximately can be freely varied by, for example, another, second high-voltage LED adjacent to the first high voltage LED on the main side of the carrier substrate arranged and conductive is connected to the power connection path of the carrier substrate.

The Light element is easy and flexible to use, for example just one located on the other side of the power cord Plug inserted or the light element by means of a Lästerklemme or otherwise directly connected to the power grid can be.

Due to the strain relief is that the light element is not only protected against electrical short circuit, but also mechanically. In some embodiments, the tensile loading functionality can be effectively ensured by mechanically mechanically rigidly attaching the end of the power cable to the carrier substrate by also being covered by the protective layer and, for example, resting on the surface of the carrier substrate. In alternative embodiments, the strain relief can by additional gluing, screwing, riveting or other mechanical connection methods are ensured.

at some embodiments a high-voltage LED is used, for example, at a voltage from bigger or equal to 90 volts or with mains voltage of 110 volts or 220 or 230 volts can be operated directly.

This has the advantage over that Low-voltage LEDs an additional Transformer can be saved, the significant production costs or operating costs (caused by the transformation losses). When using a high-voltage LED so can the production efficiency and increase efficiency during operation, with when using a carrier substrate Covering protective layer, the live parts can be isolated, so that there is no impairment the electrical safety can come.

at further embodiments According to the invention, the lighting element further comprises an optical element on, which is geometrically rigid relative to the LED, and to can be used, the Lichtabstrahlcharakteristik the LED or of the luminous element to adjust or vary. In some embodiments will do it a cylindrical component over the LED on a carrier substrate inverted and with the carrier substrate firmly connected, so that stray light, which is parallel to the surface of the carrier substrate exits, is shaded and thus a directivity of the light emission can be achieved in a direction perpendicular to the surface of the carrier substrate can. This can be advantageous if a directed light emission is required, for example, in office lamps in which the so shielded stray light is not desired. The scattered light would u. a. can lead to the glare of the person using the lamp. In alternative embodiments Other optical elements, such as lenses, are used. So z. B. a lens mounted on the LED to go through the refractive properties of the lens, the light propagation to influence. It can on the one hand a focus, similar to the use the cylindrical component can be achieved, on the other hand can be aware a scattering lens can be used to minimize the light emission to enable homogeneous in every solid angle range.

at some embodiments is the optical element itself with respect to the carrier substrate or with respect to the LED fixed by means of the protective layer, which is a particularly efficient Allows production, there no additional Connection steps, structures or elements are applied have to.

at some embodiments becomes a transparent material as an electrically insulating material the protective layer used so as to allow, for example, labels or product specifications save space on the carrier substrate, for example, on the side opposite the main side of the carrier substrate, to install. Furthermore, this can have the advantage that the optical Properties only by the additionally applied optical Element determined, and not by a possibly opaque insulating Material of the protective layer to be dominated. Becomes transparent In addition, material used as insulating material may a certain tolerance with regard to the accuracy of the application the protective layer can be achieved. Even if the protective layer the optical element partially or completely covered, the optical Image properties or the optical properties of the luminous elements according to the invention only slightly changed.

at further embodiments is a switch for switching on and off of the lighting elements or of the luminous element either directly on the carrier substrate or in the power cable arranged so that these embodiments Light elements according to the invention are directly and directly applicable, for example, by these just have to be plugged into a power outlet.

at further embodiments is the carrier substrate Completely coated by the protective layer, which, for example, in the production a simple dipping of, when using a transparent material, even already equipped with LED carrier substrate allowed in the insulating material. In this way you can the complexity production are further reduced.

preferred embodiments The present invention will be described below with reference to FIG the enclosed figures, closer explained. It demonstrate:

1 : an embodiment of a luminous element according to the invention;

2 a further embodiment of a luminous element according to the invention;

3 Three sectional views of the embodiment of 2 ;

4a a further embodiment of a luminous element;

4b a three-dimensional view of the embodiment of 4a ;

4c FIG. 4: a detailed view of the optical element of the exemplary embodiments of FIG 4a and 4b ;

5 : An embodiment of a method for producing a luminous element.

1 shows an embodiment of the luminous element, which is a carrier substrate 2 , an LED 4 , and a power cable 6 includes. Within the carrier substrate 2 There is a power connection path, for example, from two etched tracks, which serves to electrical Kontak orientation of the LED 4 to enable. For clarity, this current termination path is in 1 not shown. It goes without saying that this on both the surface and in the interior of the carrier substrate, in alternative embodiments, also on the underside of the carrier substrate 2 can be located. On the main side of the carrier substrate 2 that is, on the side on which the LED 4 is disposed, there is also a current-carrying parts on the main side covering protective layer of electrically insulating material, which moreover the power cable 6 at its end region, which is connected to the carrier substrate, covered. As a result, it can be achieved that the power cable is also mechanically connected to the carrier substrate, so that a strain relief functionality is ensured. This can also be achieved in a very simple manner during production by the cable during the coating with insulating material 6 co-coated and thus mechanically connected to the carrier substrate.

Im in 1 The case shown is in the end region 8th of the cable in which this on the carrier substrate 2 rests, the cable further guided semicircular on the carrier substrate, so that there is an increased contact surface of the cable with the carrier substrate or the protective layer, which additionally improves the zugentlastenden properties.

The Type of application of the protective layer does not matter rather, all possible Procedure during production conceivable, such as potting, coating or referring. additionally or alternatively to generate the strain relief by coating Of course, the cable can also strain relief by other methods or methods be ensured, for example by gluing, Pressing, crimping, screws and the like.

It needs no further explanation, that in embodiments the invention further electronic components for the operation of High-voltage LED on the carrier substrate attached or integrated into the high-voltage LED. Such components can For example, rectifiers, voltage converters and the like include.

2 shows a further embodiment of a luminous element, in which on the carrier substrate 2 another, second LED 10 is arranged over the cable 6 and in the carrier substrate 2 Power supply path is powered or connected via these elements. In this way, a luminous element according to the invention can be substantially expanded or modified as desired, in that a plurality of LEDs can be combined in a simple manner. In this case, on the one hand the electrical power achieved can be arbitrarily adapted to the needs, on the other hand, the geometric appearance or the appearance of the lamp or the lighting element can be varied arbitrarily and in a simple manner. For example, if a light output of 8 watts is desired, two 4-watt LEDs can be combined to achieve the overall electrical output.

3 shows that in 2 shown embodiment again in a plan view, as well as in a two-dimensional projection along the projection directions 20 (A) and 22 (B).

The 4a to 4c show a further embodiment of a luminous element.

That in the 4a respectively. 4b shown luminous element is based on the luminous element of 2 respectively. 3 so that a renewed description of the components already described there is dispensed with. That in the 4a and 4b shown light element differs from that in the 2 and 3 shown luminous element in that an additional optical element 30 is used in the form of a cylindrical hollow body, which the LEDs 4 and 10 surrounds and has an opening which is perpendicular to the surface of the carrier substrate 2 has. The opaque cylindrical body 30 serves to the emission characteristics of the LEDs 4 and 10 to influence a directed radiation in a direction perpendicular to the surface of the carrier substrate 2 to reach. In the in the 4a and 4b the embodiment shown is the optical element 30 by means of the protective layer 32 attached, so relative to the LEDs 4 and 10 fixed.

Alternatively, the optical element 30 Of course, by an additional production step, for example by gluing, soldering, crimping or other mechanical connection steps either with the LEDs 4 or 10 directly or with the carrier substrate 2 get connected.

The optical element, for example, the described cylindrical hollow body, can also have the effect of obscuring the LED when applying or applying prevent the potting compound. Furthermore, it can be a mechanical Protection for the LED by pointing in the direction perpendicular to the main surface of the carrier substrate protrudes further than the LED.

Instead of the cylindrical optical components shown here by way of example are other optical components conceivable, for example, lenses, mirrors, birefringent prisms or the like.

Summarized have the above discussed or described embodiments Light elements according to the invention a bunch of big ones Advantages.

To the one can this, as will be described in more detail below, cost and be prepared with a few production steps, in particular few, inexpensive components can be used.

Further can the lighting elements with respect the shape and the light output approximately arbitrary to be adjusted about In addition, their low geometric expansion (in the absence of an additional case) causes that these are used in many different application scenarios can be.

The fact that luminous elements according to the invention can be produced in an extremely efficient manner will be described again briefly below with reference to the schematic in FIG 5 emphasizes the manufacturing process.

It is possible to fully functional, all safety requirements lighting elements with the few, in 5 shown to produce production steps.

In a deployment step 100 First, a carrier substrate is provided with a conductive power connection path.

In a placement step 102 For example, a high-voltage LED is conductively connected to the power connection path and disposed on a main side of the support substrate.

In a confectioning step 104 becomes a power cable ( 6 ) conductively connected to the power connection path, a strain relief at one of the conductive connection with the power connection path of the carrier substrate ( 2 ) adjacent end region ( 8th ) of the power cable. and

In a coating step 106 becomes a protective layer ( 32 ) made of electrically insulating material on the main side of the carrier substrate ( 2 ), so that the protective layer covers all live parts and the strain relief.

Claims (14)

Luminous element having the following features: a carrier substrate ( 2 ) with a conductive power connection path; one on a main side of the carrier substrate ( 2 ) arranged high-voltage LED ( 4 ) conductively connected to the power connection path; a power cable electrically connected to the power connection path ( 6 ) which is connected to the conductive connection to the current connection path of the carrier substrate (FIG. 2 ) adjacent end region ( 8th ) has a strain relief; and one on the main side of the carrier substrate ( 2 ) applied protective layer ( 32 ) of electrically insulating material, wherein the protective layer covers all live parts and the strain relief. Luminous element according to claim 1, wherein the power cable ( 6 ) in the end region ( 8th ) on the carrier substrate ( 2 ) and with the protective layer ( 32 ) is covered to reach the strain relief. Luminous element according to Claim 5, in which the high-voltage LED ( 4 ) is designed to be operated with voltages greater than or equal to 90 volts. Luminous element according to one of the preceding claims, with the following additional feature: one with the LED ( 4 ) optically coupled optical element to control the light emission of the LED ( 4 ) to influence; Illuminating element according to Claim 4, in which the optical element is mounted relative to the LED ( 4 ) by the electrically insulating material of the protective layer ( 32 ) is fixed. Luminous element according to Claim 4 or 5, in which the optical element has a contour of the LED ( 4 ) enclosing the hollow body with a pointing in a direction perpendicular to the main surface opening to scatter light of the LED ( 4 ) in a direction parallel to the main side of the carrier substrate ( 2 ) to reduce. Luminous element according to claim 4 or 5, wherein the optical element on the LED ( 4 ) on the opposite side of the main surface lens comprises. Luminous element according to one of vorherge claims in which the electrically insulating material of the protective layer ( 32 ) is optically transparent. Lighting element according to a of the preceding claims, wherein the insulating material is a silicone. Luminous element according to one of the preceding claims, with the following additional feature: one in the current connection path on the carrier substrate ( 2 ) to allow an optional interruption of the power connection path. Luminous element according to one of claims 1 to 10, with the following additional feature: one in the power cable ( 6 ) arranged in order to allow an optional interruption of the electrical conductivity of the power cable. Luminous element according to one of the following claims, with the following additional feature: a second on the main side of the carrier substrate ( 2 ) LED ( 4 ), which is conductively connected to the power connection path. Luminous element according to one of the preceding claims, in which the carrier substrate ( 2 ) completely from the protective layer ( 32 ) is sheathed. A method for producing a luminous element, comprising: providing a carrier substrate ( 2 ) with a conductive power connection path; conductive connect one on a main side of the carrier substrate ( 2 ) arranged high-voltage LED ( 4 ) with the power connection path; conductive connection of a power cable ( 6 ) with the power connection path and generating a strain relief at one of the conductive connection to the power connection path of the carrier substrate ( 2 ) adjacent end region ( 8th ) of the power cable; and applying a protective layer ( 32 ) of electrically insulating material, the main side of the carrier substrate ( 2 ) so that the protective layer covers all live parts and the strain relief.