Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
  • F21V7/00—Reflectors for light sources
  • F21V7/04—Optical design
  • F21V7/09—Optical design with a combination of different curvatures
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
  • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
  • F21V23/04—Arrangement of electric circuit elements in or on lighting devices the elements being switches
  • F21V23/0442—Arrangement of electric circuit elements in or on lighting devices the elements being switches activated by means of a sensor, e.g. motion or photodetectors
  • F21V23/0471—Arrangement of electric circuit elements in or on lighting devices the elements being switches activated by means of a sensor, e.g. motion or photodetectors the sensor detecting the proximity, the presence or the movement of an object or a person
  • F21V23/0478—Arrangement of electric circuit elements in or on lighting devices the elements being switches activated by means of a sensor, e.g. motion or photodetectors the sensor detecting the proximity, the presence or the movement of an object or a person by means of an image recording device, e.g. a camera
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
  • F21V33/00—Structural combinations of lighting devices with other articles, not otherwise provided for
  • F21V33/0004—Personal or domestic articles
  • F21V33/0052—Audio or video equipment, e.g. televisions, telephones, cameras or computers; Remote control devices therefor
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
  • F21V7/00—Reflectors for light sources
  • F21V7/0058—Reflectors for light sources adapted to cooperate with light sources of shapes different from point-like or linear, e.g. circular light sources
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
  • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
  • F21V29/50—Cooling arrangements
  • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
  • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
  • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
  • F21V29/763—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section the planes containing the fins or blades having the direction of the light emitting axis
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
  • F21V33/00—Structural combinations of lighting devices with other articles, not otherwise provided for
  • F21V33/0064—Health, life-saving or fire-fighting equipment
  • F21V33/0076—Safety or security signalisation, e.g. smoke or burglar alarms, earthquake detectors; Self-defence devices
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
  • F21Y2115/00—Light-generating elements of semiconductor light sources
  • F21Y2115/10—Light-emitting diodes [LED]

Definitions

• the invention concerns an LED module containing a number of LEDs and a reflector to reflect the light emitted by the LEDs.
• LED module as described in the first paragraph is known from the German patent application DE 10 2004011600.
• the reflector is shaped as a continuous ring with an internal and external reflector surface, the surfaces of which are paraboloid shaped.
• a ring fitted with LEDs has been placed in the reflector.
• LED is the standard term for a Light Emitting Diode.
• the LEDs emit light sideways, in the direction of the reflecting surfaces of the reflector.
• the light is reflected by the reflecting surfaces of the reflector.
• the ring-shaped reflector can have an opening in the centre behind which an LED can also be placed.
• Such a module can be used, for example, as the tail/rear lights of a vehicle.
• the rear of the ring can be given a different function, e.g.
• the light image consists of a central, bright part, and an outer ring of light separated by a dark band. Although this could be suitable for the tail/rear lights of a car, it is not suitable for existing LED lamps in light fixtures.
• the known lamp is not suitable for the ever-evolving miniaturisation of LED modules.
• the invention provides an LED module which contains a ring of LEDs, with the module containing a reflector cup for every LED and with a communal ring-shaped reflector compartment positioned in front of the set of reflector cups, and with the ring-shaped reflector compartment containing a raised edge enclosing a central compartment, screened off from the light of the LEDs.
• This configuration enables a targeted, more or less even bundle of light rays to be obtained where the LEDs and the reflectors need less space.
• a compartment has been left open in the centre of the LED module and some of the electronics which are normally contained in the power supply unit can be installed in this compartment.
• the space that has been made available can also be used to add an extra function to the LED module, e.g. a sensor, speaker, camera.
• the light of the LEDs does not enter this central compartment and cannot interfere with the functioning of the parts installed in the space that has been saved.
• optical sensors are cameras, FIR sensors, motion sensors, and some smoke sensors.
• the reflector cups preferably overlap each other. Having the reflector cups overlap results in a better light profile and enables the module to be made slightly smaller.
• the module preferably contains a diffuser between the reflector cups and the second reflector compartment.
• the module contains a diffuser at the front side of the communal reflector compartment.
• the LED module preferably contains a heat sink with a recess for a reflector cup.
• a reflector cup on the side directed towards the LED preferably has a longitudinal opening.
• LED modules containing a ring of LEDs are described in
• Figure 1 shows a perspective view of an LED module according to the invention with a power supply
• FIG. 2 is a more detailed perspective view of an LED module according to the invention.
• Figures 3 A and 3B show two examples of a reflector for an LED module according to the invention
• Figures 4A to 4C are views of a reflector for an LED module according to the invention.
• Figure 5 is a cross-sectional view of a reflector for an LED module according to the invention.
• FIG. 6 is another example of a module according to the invention.
• the figures are exemplary figures, wherein, as a rule, like numerals denote like elements.
• Figure 1 shows a perspective view of an embodiment of an LED module according to the invention with a power supply.
• the LED module contains a PCB 1 onto which LEDs have been fitted.
• a reflector 2 has been installed in front of the PCB.
• the PCB is attached to a heat sink 3 to dissipate heat.
• a screening glass 4 has been fitted in front of the reflector 2 to prevent the inside of the reflector from getting dirty, resulting in a decrease in light output.
• a diffuser 5 has been placed in the reflector in this example of embodiment. This is an optional application, depending on the extent to which one would want to target the bundle of light rays.
• the diffuser is preferably of a matt colour to optimally mix the light and it preferably has a light loss of less than 15%.
• Power is supplied via a secondary connection cable 8 and a mains plug 6 for the 230V power mains and a 230V/24V power supply unit 7.
• the intention is to achieve the greatest possible space internally in the LED module in order to integrate an electronic circuit.
• the features sometimes require more than the customary two current wires (+ and - wires) to the power supply unit. Relocating some of the electronic components from the power supply unit to the LED module enables the use of only two wires to be maintained.
• a female socket 11 has been integrated at the rear of the heat sink enabling different cable diameters and cable grades to be connected to it.
• An enlarged compartment for an electronic circuit by means of a second PCB that is connected to the first PCB by means of a plug also offers the opportunity of installing an extra component (e.g. a sensor or camera 12) at the front of the lamp, which is screened off from the light of the LEDs, enabling this extra component to work properly.
• an extra component e.g. a sensor or camera 12
• the LED module is not significantly larger than the existing halogen lamps.
• the invention provides an LED module that makes this possible.
• FIG. 2 shows an LED module according to the invention with more details.
• the PCB 1 has been fitted with LEDs 9.
• the PCB has also been fitted with electric circuit 10 and an extra feature 12, a PIR (Pyroelectric Infrared) sensor 12 in this example of embodiment.
• a PIR (Pyroelectric Infrared) sensor 12 in this example of embodiment.
• the wall of a reflector cup is constructed such that a bundle of light of 17° or less, e.g. 12° (narrow spot) is created.
• a diffuser enables the width of the bundle to be expanded from 17° or 12° to 25-30° (spot) or from 17° to 50-60° (flood). This broadening of the bundle is accompanied by a loss of light of less than 15%, and preferably less than 10%;
• the diffuser hides the reflector cups and LEDs from view and creates a calm and homogeneous circle of light.
• Figures 3 A and 3B show two examples of a reflector for an LED module according to the invention.
• the reflector 2 contains a number of cup-shaped reflector cups 13 that have an opening for an LED on their lower side.
• the reflector also contains a second communal reflector compartment 14. This configuration enables a targeted, more or less even bundle of light rays to be obtained, in situations where the LEDs and the reflector need less space.
• a compartment has been left open in the centre of the LED module. Some of the electronics which are normally contained in the power supply unit can be installed in this compartment. The available compartment can also be used to add an extra function to the LED module.
• the second reflector compartment 14 also offers the possibility, in embodiments, to broaden the bundle of light by placing the diffuser 5 at the transition of the reflector cups to the second reflector compartment. Placing the diffuser in the communal compartment reduces the risk of being blinded. When looking at the lamp from a diagonal angle the diffuser should preferably be placed as deeply as possible into the reflector. In preferred embodiments the diffuser can also be placed at the front of the lamp so that the light can first already be mixed in the communal reflector compartment and then it can be mixed further by the diffuser 5. The distance has been chosen such that the outlines of the existing halogen lamp are not exceeded.
• Figures 3 A and 3B show reflectors with diameters of approx. 50 mm and approx. 100 mm respectively.
• the number of reflector cups is approx. 12, e.g. 10 and 20 respectively.
• a diffuser can be used to enlarge the bundle of light.
• the height of the second mixing chamber then is at approx. 6 to 10 mm.
• Another advantage of the use of more LEDs is that the heat can be dissipated to the heat sink 3 better and more evenly.
• the communal ring-shaped reflector compartment 14 has an outer wall 15a and an inner wall 15b.
• the inner wall 15b encloses a central compartment 16. While in use, the light of the LEDs does not enter the central compartment 16 due to the screening action of the inner wall 15b.
• Some of the electronics which are normally contained in the power supply unit can be installed in the central compartment 16. The space that has been made available can also or additionally be used to add an extra function to the LED module, e.g. a sensor, speaker, camera.
• the light of the LEDs does not enter this central compartment and cannot interfere with the parts installed in the central compartment 16.
• optical sensors are a camera 12, FIR sensors, motion sensors, and some smoke sensors.
• the wall 15b screens off the optical sensor from the light of the LEDs so that this does not interfere with the operation of the optical sensor 12. This brings great benefits, especially when sensors are used for surveillance purposes, such as security cameras and/or motion sensors:
• the sensor is integrated into the LED module
• the LED module can be fitted with both a motion sensor and a camera.
• a set of LED modules can also be used, with at least one of the modules of the set being provided with a motion sensor and at least one other one with a camera.
• a set of LED modules can also be used, with one of the modules being provided with a smoke detector and at least one other one with a camera. The location of any fire that breaks out can then immediately be identified.
• Figures 4A to 4C are different views of a reflector for an LED module according to the invention.
• Figures 4B and 4C show that the reflector cups overlap in the overlap zone 17.
• the PCB is screwed down with a number of screws, e.g. 3.
• a longitudinal opening 18, see figure 4C, can be made on the lower side of every reflector cup to make the screw head fit neatly between all the reflector cups as desired.
• Figure 5 shows a cross-sectional view of a reflector for an LED module according to the invention.
• I represents the depth of the reflector
• II the size of the overlap
• III the height of the second reflector compartment.
• the total depth (I + III) is preferably between 15 and 19 mm, preferably approx. 17 mm, with a margin of approx. 0.5 mm.
• the ratio between the dimensions I and III is preferably between 0.7 and 1.5.
• the ratio between the depth of the reflector cup and the depth of the second reflector compartment is then between 0.7 and 1.5.
• I is approx. 9 mm and III approx. 8.3 mm.
• the reflector cups provide a targeted bundle of light, while the communal second reflector compartment ensures that the light is mixed. A very short second reflector compartment gives too little mixing, whereas the disadvantage of a compartment that is too long is that the lamp outlines are exceeded.
• 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 approx. 2.6 mm. Too large an overlap causes the light to spread more. Preferably both depth ratios are complied with.
• the communal reflector compartment is preferably constructed as a channel with the width IV of the channel being between 12 and 18 mm.
• the diameter V of the reflector is preferably between 50 and 100 mm, depending on the type of LED module. These dimensions yield a good light image and enable sufficient space to be saved in the centre of the LED module for electronics and/or extra features.
• Figure 6 is another example of an LED module according to the invention.
• This module is different from the module shown in figure 1 in that a wall of the heat sink serves as a part of the communal reflector compartment.
• the wall 15b is a part of the heat sink.
• the reflector compartment is formed by a wall of the heat sink and walls of reflector 2.
• reflector 2 does not have the outer wall 15a, but does have the inner wall 15a.
• the module can be provided with a temperature sensor, such as a thermistor which can be used to keep the operating temperature below a certain temperature, e.g. below 75 °C at the location of the sensor, and preferably below 70 °C.
• a signal from the temperature sensor can be supplied to a control circuit for the sensor.
• the thermistor is fitted between the LEDs.
• the thermistor signal is an indication of the temperature.
• This signal is supplied to a control circuit for the sensor, e.g. a microprocessor.
• Sensor 12 is a motion sensor.
• a motion sensor generates a signal.
• the signal of the motion sensor is compared to a "threshold". Only if the signal of the motion sensor is greater than the threshold will a movement be registered and an action follow, such as the light and/or cameras switching on or a signal being given to a security switchboard.
• the sensitivity of the motion sensor depends on temperature, with a higher temperature in one example yielding lower sensitivity, i.e. the same movement of an object at a higher temperature resulting in a smaller motion sensor signal.
• the thermistor signal is supplied to the control circuit which sets the threshold as a function of the thermistor signal, i.e. as a function of the temperature in the module, where in this case the threshold is decreased if the temperature increases. This can be configured in hardware or in software form.
• This example features a motion sensor, but the same principle can be used for other sensors, such as smoke sensors or cameras.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Multimedia (AREA)
• Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=42237311

Family Applications (1)

Country Status (3)

Families Citing this family (8)

Family Cites Families (5)

• 2009
  • 2009-10-25 NL NL1037416A patent/NL1037416C2/nl not_active IP Right Cessation
• 2010
  • 2010-10-24 WO PCT/NL2010/000152 patent/WO2011049435A1/en not_active Ceased
  • 2010-10-24 NL NL1038327A patent/NL1038327C2/nl not_active IP Right Cessation
  • 2010-10-24 EP EP10782425A patent/EP2491299A1/de not_active Withdrawn

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events