CROSS REFERENCE TO RELATED APPLICATIONS

This application is a U.S. nationalization under 35 U.S.C. § 371 of International Application No. PCT/EP2019/060172, filed 18 Apr. 2019, which claims priority to German Patent Application No. 10 2018 109 656.9, filed 23 Apr. 2018 and German Patent Application No. 10 2018 118 000.4, filed 25 Jul. 2018. The disclosures set forth in the referenced applications are incorporated herein by reference in their entireties.

The invention relates to a luminaire, an arrangement with a luminaire, particularly a door contact switch, a circuit board with LED illuminants and the use of a luminaire.

A luminaire of the initially mentioned type is known from EP 2 941 096 A2, for example, and is designed with regard to the problem that replaceable LED-based illuminant units can be used in lighting arrangements. The currents supplied to the LEDs are specially adapted to ensure uniform and even light output.

The known luminaire has a control gear for this purpose, which provides a supply current depending on an identification circuit. The identification circuit is part of a circuit arrangement with several electrical resistors, of which at least a part can be optionally added to the identification circuit. A switching element is assigned to each of the resistors, wherein the illuminants interact with the respective switching elements. The switching elements can be activated contactless by reed contacts. In the above-mentioned, known resistor network the reed contact is essentially used statically.

The invention is based on the object of providing a luminaire which can be used in a system with several movement partners which are movable relative to each other. Depending on the position of the movement partners relative to each other, a certain function of the luminaire is to be triggerable. The invention is further based on the object of providing an arrangement, particularly a door contact switch, a circuit board and a use of the luminaire.

According to the invention, the object is solved with regard to the luminaire by the subject matter of claim1. With regard to the arrangement, the circuit board and the use, the object is solved in each case by the subject matter of claims6,9and10.

Specifically, the object is solved by a luminaire having a circuit board with at least one LED illuminant, particularly having several LED illuminants, which are arranged on the circuit board. The circuit board is arranged in a luminaire housing with a translucent housing section. The circuit board has a switching device for switching the LED illuminant(s) on and off. The switching device comprises a reed switch located on the circuit board between at least one power connection and the LED illuminant(s). The reed switch is magnetically switchable to disconnect or connect a central power supply for the LED illuminant(s).

The invention comprises both a circuit board with a single LED illuminant and a circuit board with several LED illuminants. The following statements in connection with several LED illuminants also apply to a variant with a single LED illuminant.

In contrast to the known luminaire, in which the reed contacts are part of a resistor circuit and are used to adjust the supply current on some LED illuminants, the reed switch within the scope of the invention forms part of the switching device for switching the LED illuminants on and off. For this purpose, the reed switch is arranged between the at least one power supply and the LED illuminants and is magnetically switchable to disconnect or connect the central power supply for the LED illuminants. There are different variations: On the one hand, the reed switch can be designed and/or arranged to disconnect the circuit of the LED illuminant itself. On the other hand, the reed switch can be designed and/or arranged in such a way as to disconnect the circuit of the LED illuminant by means of a switching device. In this case, the switching device, e.g. a transistor, is controlled by the reed switch, which is preferably arranged in the circuit of the LED illuminant and then disconnects it to switch off the LED illuminant. This has the advantage that the reed switch, in comparison to the first variation, can work with smaller currents and can therefore be designed smaller, more sensitive and cheaper.

The luminaire according to the invention can therefore be used to connect a mechanical relative movement between movement partners, for example the opening or closing of a door, with a desired function, namely the switching on or off of the LED illuminant. The invention creates a solution that enables the switching on or off of the LED illuminants without contact. This allows maximum flexibility in the mechanical arrangement of the LED illuminants for switching on or off. The invention also represents a significant improvement in terms of design, because the conventional mechanical actuation, for example by moving the pin of a mechanical switch, and the associated design restrictions are eliminated. The luminaire has a simple design because the usual wiring is eliminated or at least simplified. According to the invention, an arrangement comprising a circuit board according to the invention or a luminaire according to the invention is further disclosed and claimed. The arrangement further comprises a means for generating a magnetic field, wherein the means for generating a magnetic field is arranged mechanically free from the circuit board or mechanically free from the luminaire. To actuate the reed switch, the means for generating a magnetic field on the one hand and the circuit board or the luminaire on the other hand are movable relative to each other.

Specifically, a door contact switch is disclosed, which implements the aforementioned arrangement according to the invention. The door contact switch thus comprises a printed circuit board or luminaire according to the invention and a means for generating a magnetic field which is arranged mechanically free from the printed circuit board or mechanically free from the luminaire. To actuate the reed switch, the means for generating the magnetic field on the one hand and the circuit board or luminaire on the other hand are movable relative to each other.

The door contact switch can be used in any environment. There are no restrictions here. The door contact switch according to the invention is especially preferred for use in electrical switch cabinets.

The means for generating a magnetic field can be, for example, a permanent magnet or a magnetic coil. The mechanically free arrangement of the means for generating a magnetic field in relation to the circuit board or the luminaire means that the means for generating a magnetic field can be added essentially freely.

The invention also discloses and claims the circuit board as such, i.e. independently of the luminaire.

Preferred embodiments of the invention are indicated in the subclaims.

Preferably, the entire electronics of the luminaire, including the circuit board, are completely encapsulated in the luminaire housing. This is made possible by the magnetic switchability of the luminaire according to the invention and thus the contactless interaction capability between a mechanical movement (e.g. a door with magnet) and the electronics of the luminaire. An advantage that arises from this is the high IP protection class that is achieved in this area. Openings in the luminaire housing, which would connect the electronics with the environment, are completely avoided. The electronics are thus ideally protected from the effects of weather and dust.

Due to the interaction of reed switch and magnet, the luminaire can be used in a potentially explosive region where a potentially explosive atmosphere occurs, because possible sparks (from the contact) and gas containing environment are safely separated.

Therefore, the invention also claims the use of the luminaire in a potentially explosive region in which a potentially explosive atmosphere can or does occur.

In a preferred embodiment, the reed switch bridges a recess in the circuit board, which is located between the power connector(s) and the LED illuminants. The recess in the circuit board has the advantage that the same circuit board can be used for different types of switches. For example, the circuit board can be used according to the invention as a switch in connection with the reed switch or in connection with known types of switches such as a toggle switch or a motion sensor.

The reed switch preferably comprises a tube in which ferromagnetic contact reeds are arranged which can be moved by applying a magnetic field. The reed switch can be designed as a normally open contact, in which the contact reeds are spaced apart in the rest state. Alternatively, the reed switch can be designed as an opener, in which the contact reeds touch each other in the rest state.

In connection with the arrangement according to the invention, one embodiment is provided in that the luminaire on the one hand and the means for generating a magnetic field on the other hand form movement partners which have at least one common stationary movement end region. The movement partners interact in the stationary movement end region to actuate the reed switch. This embodiment is realized, for example, in the case of the door contact switch according to the invention, if the luminaire is attached to one of the movement partners, e.g. the door frame, and the means provided for generating a magnetic field, e.g. a magnet, is attached to the other movement partner, e.g. the door.

The invention is described in more detail by means of an exemplary embodiment with reference to the attached schematic drawings.

