NL1039662C2 - LED MODULE. - Google Patents

Description

LED Module and lamp containing an LED module.

FIELD OF THE INVENTION

The invention relates to an LED module comprising a number of LEDs and a reflector for reflecting light emitted by the LEDs and a raised edge enclosing a central space.

State of the art.

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An LED module as described in the first paragraph is known from Dutch patent NL 1038327. The LED module comprises a number of LEDs and a reflector for reflecting light emitted by the LEDs. The LED module contains a ring of LEDs and a raised edge that encloses a central space.

15 LED Modules often form part of a larger unit such as, for example, a monitoring unit. That is why communication with the LED module is important.

It is an object of the invention to provide an LED module of the type mentioned in the first paragraph 20 which allows good communication with the LED module.

Summary of the invention

To this end, the LED module according to the invention is characterized in that the raised edge is provided with a cylindrical antenna for wireless communication from and to the LED module.

Because the communication takes place wirelessly, no connection wires are needed for the communication.

The mounting of a cylindrical antenna on the raised edge makes reliable wireless communication possible both between an LED module and another device and between LEDs themselves.

1039662 2

The circular antenna is preferably arranged in an annular slot in the raised edge.

The circular antenna is more preferably arranged on an outside of the raised edge. Still more preferably, the circular antenna comprises two or more sub-rings.

Preferably, a sensor is provided within the raised edge, for example an optical sensor. Optical sensors include cameras, PIR sensors, motion sensors, and some smoke sensors.

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Brief description of the drawings

The invention will be explained in more detail below with reference to exemplary embodiments of the LED module according to the invention shown in the drawings.

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It shows:

Figure 1 is a perspective view of an LED module according to the prior art; Figure 2 shows a more detailed perspective view of an LED module according to the invention;

Figures 3A and 3B show two examples of a reflector for an LED module according to the invention;

Figure 4 shows a cross section of a reflector for an LED module according to the invention. Figure 5 shows a foil with a closing antenna on top for winding around the raised edge.

The figures are exemplary figures, the same parts are generally designated by the same reference numerals.

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Detailed description of the drawings

Figure 1 shows in perspective view an embodiment of an LED module known from the Dutch patent NL1038327.

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The LED module contains a PCB 1 on which LEDs are mounted. A reflector 2 is provided for the PCB. To dissipate the heat, the PCB is mounted against a heat sink 3. In this example, a shielding glass 4 is provided for the reflector 2 in order to ensure that the inside of the reflector does not become dirty, so that the light output would be reduced. A diffuser 5 is placed in the reflector in this exemplary embodiment. This is an optional application depending on the extent to which you want to create a targeted bundle. The diffuser is preferably matte in color to optimally mix the light and preferably has a light loss of less than 15%.

Via a mains plug 6 for the mains mains of 230V and a power supply of 230V / 24V 7, a a secondary connection cable 8 power supply.

It is desirable to obtain the largest possible space in the LED module for inserting an electronic circuit. Sometimes the features require more than the usual 2 wires (+ and - wires) for the power supply. By moving part of the electronics from the power supply to the LED module, it is possible to continue working with only 2 wires. In this embodiment a female socket 11 is integrated in the rear side of the heatsink so that different cable diameters and cable qualities can be connected to it

Due to the ever-increasing miniaturization of electronic circuits, it will probably become possible in the future to have the 230V / 24V power supply terminated in the future and directly connect the module to 230V. An enlarged space for an electronic circuit by means of a second printed circuit board which is connected to the first printed circuit board via a plug also offers the possibility of an additional component (for example a sensor or camera 12) on the front of the lamp, shielded from the light. of the LEDs, so that this extra part can do its job well. The light from the LEDs in the ring does not enter the room, so this light cannot negatively influence the function of a part placed in the room. This is especially important for optical sensors, including cameras, P1R sensors and some smoke sensors.

However, in order to achieve rapid deployment of LED lamps in practice, it is important that the LED module is not appreciably larger than the existing halogen lamps.

The external dimensions of the existing halogen lamps are laid down in standards (“lamp outlines”) and it is therefore important to stay inside with the LED modules so that a quick exchange is possible without having to buy a new lighting device.

Figure 2 shows a LED module according to the invention in more detail.

LEDs 9 are mounted on the PCB 1. Electric circuit 10 is also arranged on the PCB and an additional feature 12, in this exemplary embodiment a PIR (Pyroelectric Infiared) sensor 12 is provided.

Figures 3A and 3B show two examples of a reflector for an LED module according to the invention. The reflector 2 comprises a number of cup-shaped reflector cups 13 At the bottom provided with an opening for an LED. The reflector also contains a 2nd common reflector space 14. A space is saved in the middle of the LED module. A part of the electronics that are normally in the power supply can be placed in this space. The vacant space can also be used to add an extra function to the LED module. The 2nd reflector chamber 14 also offers the possibility, in embodiments, to widen the light beam by placing the diffuser 5 on the transition from the reflector cups to the 2nd reflector space. Placing the diffuser in the communal area reduces the risk of being blinded when tilted towards the. When looking at the lamp, it is preferable to place the diffuser as deep as possible in the reflector. The diffuser can also, in preferred embodiments, be placed at the front of the lamp so that the light can first be mixed in the common reflector space and then further mixed by the diffuser 5. Preferably, the whole remains precisely within the outlines of the existing halogen lamp. It is easier to stay within the outlines by not choosing the standard high power LEDs (> 1 W), but rather by taking a slightly smaller middle power LEDs (0.3 W-0.7 W). Figures 3A and 3B show reflectors with a diameter of approximately 50 mm and approximately 100 mm, respectively. The number of reflector cups is approximately 12, for example 10 and 20 respectively. In order to be able to make different beam widths, it is advantageous to design the reflector cups in such a way that a small light beam (10-15 or 15-17 °) is made. The light beam can be made larger via diffuser 5.

In order to ensure that the user does not look into the annoying light, it is advantageous to place the ring of reflector cups as deep as possible without sticking out of the lamp outlines. The height of the 2nd mixing chamber is then approximately 6 to 10 mm.

In order to generate as much light as possible, it is advantageous to place many LEDs in the circle. An advantage of using more LEDs is that the heat can then be dissipated better and more evenly to the heat sink 3.

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The common annular reflector space 14 is provided with a raised edge with an outer wall 15a and an inner wall 15b. The inner wall 15b encloses a central space 16. The light from the LEDs does not enter into the central space 16 due to the shielding action of the inner wall 15b. In the central space 16 a part of the electronics, which is normally in the power supply, can be placed. The vacant space can also or also be used to add an extra function to the LED module, for example a sensor, speaker, camera.

The light from the LEDs does not enter this central space and cannot interfere with the components placed in the central space 16.

This is particularly advantageous if an optical sensor is placed in the recessed space. Optical sensors are, for example, a camera 12, FIR sensors, motion sensors, and some smoke sensors. The wall 15b shields the optical sensor 15 from the light of the LEDs, so that the optical sensor 12 is not affected by this. Especially when using sensors for surveillance, such as surveillance cameras and / or motion sensors, great advantages are provided: - no separate sensor is required, the sensor is integrated in the LED module - the object or person to be monitored is always well lit 20 - the presence of the sensor is, in use, not or very difficult to detect by people with the eye. To do this, one must look straight into the light. However, this blinds the eyes, so that persons who want to approach an object to be monitored with bad intention cannot see whether the module, or if there are several, which of the modules, is equipped with an optical sensor.

In embodiments, the LED module can be provided with both a motion sensor and a camera. It is also possible to use a system of LED modules, wherein at least one of the modules of the system is provided with a motion sensor and at least another with a camera. To prevent a fire hazard, it is also possible to use a system of LED modules, one of which is provided with a smoke detector and at least one with a camera. In the event of a fire, it is then immediately possible to see where the fire is.

Especially when using a sensor in the central room, it is important to be able to provide good communication with the LED module for connecting and disconnecting electrical signals. Electrical signals can be signals for switching on functions such as switching on the LEDs or the sensor or signals coming from a sensor 6, such as camera signals. To this end, the LED module according to the invention is characterized in that the raised edge is provided with a cylindrical antenna 17 for wireless communication from and to the LED module.

An antenna at this position offers a good signal without disturbing the function of the other 5 elements, such as electronics. A signal transmitted by the antenna is easy to receive in a wide range.

Because the communication takes place wirelessly, no connection wires are needed for the communication.

The provision of a cylindrical antenna on the raised edge makes reliable wireless communication possible both between an LED module and another device and between LEDs themselves.

The circular antenna is more preferably arranged on an outside of the raised edge. Still further preferably, the circular antenna comprises one or two parts.

Figure 4 is a sectional view of a reflector for an LED module according to the invention.

The dimensions are also shown schematically on this. I stands for the depth of the reflector, II for the size of the overlap and III for the height of the second reflector space.

The total depth (I + III) is preferably between 15 and 19 mm, preferably about 17 mm, with a margin of about 0.5 mm. The ratio between sizes I and III is preferably between 0.7 and 1.5. The ratio of the depth of the reflector cup to the depth of the two reflector space is then between 0.7 and 1.5. In this example I

approximately 9 mm and III approximately 8.3 mm. The reflector cups provide a focused beam, the common second reflector space ensures a mixing of the light. A very short second reflector space results in too little mixing, while a too long one has the disadvantage of being outside the lamp outlines. The ratio between the depth II of the overlap between reflector cups 13 and the depth I of the reflector cups is preferably between 0.2 and 0.4. In this example, II is approximately 2.6 mm. Too large an overlap gives a greater spread of light. Both proportions in depth are preferably met.

The common reflector space is preferably designed as a gutter, the width IV of the gutter being between 12 and 18 mm. The diameter V of the 7 reflector is preferably between 50 and 100 mm, depending on the type of LED module. These dimensions provide a good light image and sufficient space is saved in the middle of the LED module for electronics and / or extra features.

The LED module is provided with a cylindrical tube 18 in which there are 5 cylindrical antennas 17a and 17b, which together with an edge 17c form the antenna 17 on the upper side of the upright wall 15b. The antennas may be mounted partially on foil, the foil being mounted on the raised edge 15b. In this example, the antenna comprises two parts, the foil with the antenna parts 17a and 17b thereon and a conductive ring 17c on the top of the raised edge. The antenna 17 is, for example, connected by means of a coaxial cable Coax to, for example, a control unit 19. This control unit 19 receives signals from the antenna and can also arrange for the transmission of signals via the antenna 17. Between the parts 17a, 17b and 17c there are slots S. from the antenna. Signals received from the antenna can be used, for example, for switching on a sensor 12.

An LED module according to the invention can be part of a system LED

modules, wherein for example one of the LED modules contains a motion sensor in space 16. As soon as this sensor detects motion, this causes the transmission of a signal via antenna 17. Another LED unit of the system receives this signal and switches on a camera which is located in the space 16 of the relevant LED module.

In addition, the LED lamps can be activated.

The mechanical structure of the LED module is very compact and therefore a difficult environment to find an adequate high-frequency solution for an approximately omnidirectional antenna.

Figure 5 shows a foil F with parts 17a and 17b on it of the antenna 17 separated by a slot S. This is an example of a lock emitter.

This solution has been found by choosing a simulation approach followed by practical tests. The film F is bent around the raised edge 15b and applied such that the ring 17c approximately adjoins the raised edges of part 17a. Between

Parts 17b and 17c then form a further slot S

After various tests, it has been found that the application of the curved slot antenna on the outer wall (Figure 3.15b) of the upper reflector wall gives very good results.

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The chosen slot antenna (Fig. 5) in this example has an additional island (17b) in the middle. This has the advantage that the size of the total antenna can be reduced with respect to an antenna which only comprises parts 17a and 17c, as a result of which the antenna 17 can be better fitted into the LED module.

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The slot antenna (Fig. 5) is fed by a coaxial cable (Coax), with which also received signals can be fed. The inner core is connected to the middle antenna island (17b) and the outside is connected to the metal layer under the first slot (17a).

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In order to make the antenna slightly more broadband and optimally adjusted for the operating frequency, a capacitor, preferably an SMD capacitor (C housing 0402) is preferably mounted between the middle island (17b) and on the metal layer under the first slot (17a). As a result, an adjustment circuit on the print can be omitted.

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Around the pir sensor is a chrome part (fig. 5, 17c), which serves as the upper part of the antenna and also has an aesthetic purpose.

The circular shape of the antenna has the advantage that the sensitivity and the transmitting force of the antenna are approximately the same in all directions. This is advantageous because it is not known in advance where parts with which to communicate, such as control equipment or other LED modules, will be located in practice.

It will be clear that the invention is not limited to the embodiments of the invention given here.

The module can be provided with a temperature sensor, such as a thermistor. This can be used to keep the operating temperature below a certain temperature, for example, at the location of the sensor below 75 ° C, preferably below 70 ° C. A signal from the temperature sensor can be supplied to a control circuit for the sensor. In an exemplary embodiment, the thermistor is provided between the LEDs. The signal from the thermistor is an indication of the temperature. This signal is applied to a control circuit for the sensor, for example a microprocessor. For example: The sensor 12 is a motion sensor. A motion sensor gives a signal. In order to prevent any movement, including that of a small object such as a flying fly or moth or running mouse, being reacted, the signal from the motion sensor is compared with a calibration signal, or in English a "threshold". Only if the signal from the motion sensor is larger than the threshold is a movement recorded and can an action follow, such as turning on the lights and / or cameras or giving a signal to a monitoring center. The sensitivity of the motion sensor is temperature-dependent, wherein in one example a higher temperature gives a lower sensitivity, that is, the same movement of an object at a higher temperature gives a smaller signal from the motion sensor. The signal from the thermistor is applied to the control circuit, which sets the threshold as a function of the signal from the thermistor, that is, as a function of the temperature in the module, in which case the threshold is lowered as the temperature increases. This can be in hard-ware form, but also in the form of soft-ware.

In this example there is a motion sensor, but the same principle can be used for other sensors, such as smoke sensors or cameras.

1039662

Claims (5)

1 LED module comprising a number of LEDs and a reflector for reflecting light emitted by the LEDs and a raised edge (15b) enclosing a central space, characterized in that the raised edge is provided with a cylindrical antenna (17) for wireless communication from and to the LED module. LED module according to claim 1, characterized in that the circular antenna (17) is arranged on an outside of the raised edge (15b). LED module according to one of claims 1 or 2, characterized in that the antenna is a slot antenna LED module according to claim 3, characterized in that the slot antenna comprises a lower part (17a), a middle part (17b) and an upper part (17c) separated by slots (S). LED module according to claim 4, characterized in that a capacitor (c) is arranged between the lower and upper part. 1 0 39 6 6 2