EP3422821B1 - Lighting device and method in connection with a lighting device - Google Patents

Lighting device and method in connection with a lighting device Download PDF

Info

Publication number: EP3422821B1
Authority: EP; European Patent Office
Prior art keywords: light; lighting device; light sources; reflected; determined
Prior art date: 2017-06-29
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Active

Application number

EP18178517.1A

Other languages

German (de)

English (en)

French (fr)

Other versions

EP3422821A1 (en

Inventor

Jari Tabell

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Teknoware Oy

Original Assignee

Teknoware Oy

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

2017-06-29

Filing date

2018-06-19

Publication date

2021-10-27

2018-06-19 Application filed by Teknoware Oy filed Critical Teknoware Oy

2019-01-02 Publication of EP3422821A1 publication Critical patent/EP3422821A1/en

2021-10-27 Application granted granted Critical

2021-10-27 Publication of EP3422821B1 publication Critical patent/EP3422821B1/en

Status Active legal-status Critical Current

2038-06-19 Anticipated expiration legal-status Critical

Images

Classifications

- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/20—Responsive to malfunctions or to light source life; for protection
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
- H05B45/12—Controlling the intensity of the light using optical feedback
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source

Definitions

the invention relates to lighting devices, and specifically to exit and emergency lights.
Exit and emergency lights are lighting devices used in facilities for safety of the facility especially in emergencies.
the purpose of exit lights is to indicate an emergency exit for people in the facility in order to guide them out of the facility in case of emergency.
exit lights are provided with a symbol including an indicator arrow attached to a cover of the lighting device or the like, to indicate the emergency exit from the facility.
Emergency lights are lighting devices ensuring sufficient illumination in a facility in case of emergency.
the exit as well as emergency lights must meet the criteria imposed on them in terms of operational reliability and lighting capacity. These criteria include, for example, operation in case of a power outage, sufficient surface brightness of the exit light, and sufficiently high illuminance output by the emergency light.
exit lights and emergency lights different elements have been used for producing the lighting, as they are purposed for different uses.
Emergency lights are required to illuminate the environment, whereas the purpose of exit lights is to illuminate the indicator symbol of the lighting device.
the same light output refers to a light output apparatus, such as an LED board, outputting an equal luminous flux from the light source.
the luminous flux from the light source is sufficient to provide appropriate illumination for the exit light, the luminous flux of this light source will be too low in connection with the emergency light.
a prior art document US 2015/359067 A1 discloses a light source apparatus in which a partition wall is provided to surround each of a plurality of light source. An optical sensor is disposed between adjacent light sources.
a prior art document US 2016/0341655 A1 discloses exterior lighting devices for an aircraft.
a photo detector is used to detect a portion of emitted light reflected by the optical elements of the lighting device. The reflected light is used to evaluate the state of wear of the light source.
the object of the invention is to provide a lighting device and a method in connection with a lighting device so as to be able to solve the above mentioned problem.
the object of the invention is achieved with a lighting device and a method characterized by the features of the independent claims.
the preferred embodiments of the invention are presented in the dependent claims.
the invention is based on a light output apparatus arranged to automatically recognize the type of the lighting device, and based on the recognition, to adjust the luminous flux being output so as to be suitable for the recognized lighting device.
a lighting pattern output by the lighting device may also be controlled based on the recognition.
the recognition is based on the amount of light reflected back from a cover of the lighting device towards the light output apparatus.
exit lights it is known that a picture is used in connection with the cover of the lighting device, and this picture reflects significantly more light back to the interior of the lighting device than the cover in connection with an emergency light, which is for example clear.
the luminous flux is set to a value that is required for this particular lighting device.
the advantage of the lighting device and the method for a lighting device according to the invention is that the light output apparatus may be used in an exit light as well as in an emergency light, and so the number of parts that need to be stored can be reduced. Further, installing the lighting device according to the invention and setting it up for operation is simple, because separate procedures are not required for configuring the light output apparatus during the installation.
Fig. 1 is a cross-sectional view of an implementation of one embodiment of the invention in connection with an exit light.
the lighting device comprises one or more light sources 1, such as LED light sources, and a structural element 3 configured to transmit light.
the structural element configured to transmit light such as a cover of the lighting device, is disposed at least partly in front of the light source.
the cover is attached to a lighting device body 5 or the like, the light source being entirely enclosed by the cover and the body.
the lighting device shown by Fig. 1 further comprises a light sensor 2 arranged in the lighting device to receive light of the one or more light sources that is reflected from the structural element 3 configured to transmit light.
Fig. 1 schematically shows how some of the light output by the light source 1 reflects back to the interior of the lighting device and hits the light sensor 2.
a light sensor refers to a component or a device having electrical properties that change by the effect of the light focused thereon. Such components may be for example photodiodes or phototransistors.
the light sensor 2 may also be a component that is adapted to receive a specific wavelength or wavelength band to avoid incorrect recognition. In this case the light sensor receives the light wavelength or wavelength band that is output with the light source in the lighting device.
the lighting device comprises control electronics connected to said one or more light sources and to the light sensor.
the control electronics are configured to determine the light output by said one or more light sources that is reflected to the light sensor from the structural element configured to transmit light.
the light sensor is thus electrically part of the control electronics for determining the amount of reflected light.
the control electronics together with the light sensor form an electric circuit that outputs a signal within said circuit as a function of the amount of light, which signal may be further utilized in the control electronics.
control electronics are further configured to control the operation of said one or more light sources in response to the determined light.
Fig. 1 shows that the structural element 3 configured to transmit light comprises a pictogram 4, whereby the lighting device is formed as an exit light.
the pictogram is disposed in the interior of the cover 3 of the lighting device.
the pictogram may also be provided on the exterior of the cover as a separate film, or it may be formed as part of the cover.
the pictogram represents, for example, an exit.
the cover may also have pre-installed holders on which the pictogram may be secured.
Fig. 2 corresponds to the example of Fig. 1 , except that the pictogram is not provided in connection with the structural element 3 configured to transmit light.
the cover 3 is a substantially clear cover, the lighting device of Fig. 2 thus being for example an emergency light for the purpose of lighting its surroundings.
the pictogram of Fig. 1 forms an obstruction for part of the light output by the light source, whereby more light is reflected towards the light sensor than in the example of Fig. 2 where there is no pictogram arranged in connection with the cover.
the control electronics may recognize the type of the lighting device based on the light reflected from the structural element configured to transmit light.
the light sensor detects together with the electronics it is connected to that the amount of reflected light is greater than a specific limit, it may be concluded that the lighting device is provided with the pictogram, the lighting device thus being an exit light. However, if the amount of reflected light is smaller than a specific limit, it may be concluded that the lighting device is an emergency light in which the structural element configured to transmit light does not have the pictogram.
control electronics are configured to control the operation of said one or more light sources in response to the determined light.
control electronics are configured to increase the luminous flux output by the one or more light sources when the amount of the determined reflected light is smaller than a specific limit.
the lighting device is an emergency light for the purpose of providing lighting in its surroundings.
control electronics are configured to decrease the luminous flux output by the one or more light sources when the amount of the determined reflected light is greater than a specific limit.
the type of the lighting device may be concluded to be an exit light.
An exit light need not provide lighting in its surroundings, but it only needs to output sufficient surface brightness for the exit sign.
the amount of reflected light is determined in connection with switching-on of the lighting device.
the lighting device when the lighting device is switched on it is determined based on the reflected light whether it is an exit light or an emergency light.
the lighting device is controlled so as to provide lighting according to the type of the lighting device, and then the lighting device is left on to provide such lighting.
the light sensor is not necessarily used during the time of providing the lighting. However, it is also possible to use the light sensor during the operating time of the lighting device, and the amount of reflected light measured by this light sensor may be used for adjustment or control purposes.
the control electronics are configured to pulse the light output by said one or more light sources, to determine the pulsed reflected light, and to control the operation of said one or more light sources in response to the determined light.
the lighting device By means of the lighting device according to the embodiment, an incorrect recognition of the operating mode caused by an external light source may be avoided.
the reflected light When light output by the light sources is pulsed, the reflected light must be pulsed correspondingly.
One possible way to implement the pulsing is presented in document FI116356 , wherein the effect of external light on measurement may be eliminated by calculating a difference between illuminations output at two different intensities, whereby the external light does not have an effect on the difference variable.
pulsing ensures that the determined light originates from one or more light sources of the same lighting device.
the light sources of the lighting device are switched on at a known light output, so that the comparison of the reflected light with the preset limit value may be carried out.
the light sources may also be switched on, for example, at full luminous flux, whereby on the basis of the amount of reflected light, lighting is turned down when it is detected that the lighting device is an exit light. When it is detected on the basis of the reflected light that the lighting device is an emergency light, lighting is allowed to remain at the original value.
the known light output of the light sources may also be, for example, 50% of the maximum light output or luminous flux of the light sources.
a suitable limit value for carrying out the recognition of the type of the light source may be determined, for example, by experiments.
Adjusting of the luminous flux of the light sources may be done by means of an electronic circuit providing a voltage or current supplying the one or more light sources, the level of which voltage or current may be adjusted.
the luminous flux may be varied by varying the current flowing through the LED components.
the luminous flux output by LED components is almost directly proportional to the current flowing through the component.
the control electronics in the lighting device either include as such a connection for controlling the LED components, or control such connection on the basis of the reflected light indicated by the sensor.
the amount of reflected light output by the light source is preferably determined in connection with switching-on of the lighting device, i.e. as soon as the lighting device is connected for operation.
the control electronics of the lighting device include, for example, a timer circuit, under the control of which, initially, the amount of reflected light is determined. After a determined time the electronic circuit performs the comparison with the preset limit and switches to a continuous operating mode using lighting selected on the basis of the comparison.
the control electronics of the lighting device when it has been detected that the lighting device is an emergency light, also switch alternative light sources on in order to provide a lighting pattern optimized for use in emergency lighting.
all of the light sources in the lighting device are not necessarily switched on; instead they are switched on only if it is detected that the lighting device is an emergency light.
Such additional light sources to be switched on may be provided, for example, with application specific optics.
the lighting device includes, for example, a housing, a cover and an LED board as a light source.
An LED board refers to a circuit board or the like comprising one or more LED light sources and electronic circuits connected thereto.
the LED board is disposed in the interior of the cover, and it also includes a light sensor directed towards the cover.
a place is arranged for example for a pictogram formed by a plastic film.
the lighting device is provided with the pictogram, whereas for use as an emergency light, the pictogram is not included.
Fig. 1 and 2 illustrate that the LED light source and the light sensor are disposed on the same circuit board.
the flow chart of Fig. 3 represents a method according to one embodiment of the invention in connection with a lighting device.
light is output 31 by one or more light sources, and light of said one or more light sources that is reflected from a structural element configured to transmit light is received 32 by a light sensor.
the light output by said one or more light sources that is reflected from the structural element configured to transmit light is determined 33, and the operation of said one or more light sources is controlled 34 in response to the determined light.
the method may be carried out with the lighting device according to the invention, and the method carried out with the lighting device and some of its embodiments have been described above in connection with the lighting device.
the information obtained from the light sensor may be used to automatically set the lighting device to operate continuously or non-continuously.
exit lights operate continuously, i.e. they are continuously on.
Emergency lights may operate non-continuously, such that they are only switched on in a battery-backed mode, also when power supply from the grid is lost.
the invention has been described above particularly with reference to an embodiment where the one or more light sources used are LED components. However, it is obvious that the light source used is freely selectable without affecting the implementation of the invention.
the features related to control of the light sources have not been described in detail in connection with the invention. In the field of lighting devices it is known per se that the luminous flux output by light sources may be adjusted.
the control electronics in the lighting device have also been described on a general level. The purpose of the control electronics in the invention is to carry out the determination of the reflected light together with the light sensor, and to control the luminous flux output by the light sources of the lighting device as appropriate, considering the type of the lighting device detected based on the amount of reflected light as described above.
Fig. 1 and 2 presenting the structures that illustrate the invention. It is obvious for a person skilled in the art that the structure of the lighting device may vary.

Landscapes

Circuit Arrangement For Electric Light Sources In General (AREA)
Photometry And Measurement Of Optical Pulse Characteristics (AREA)

EP18178517.1A 2017-06-29 2018-06-19 Lighting device and method in connection with a lighting device Active EP3422821B1 (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
FI20175625A FI127633B (fi)	2017-06-29	2017-06-29	Valaisin ja menetelmä valaisimen yhteydessä

Publications (2)

Publication Number	Publication Date
EP3422821A1 EP3422821A1 (en)	2019-01-02
EP3422821B1 true EP3422821B1 (en)	2021-10-27

Family

ID=62748740

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP18178517.1A Active EP3422821B1 (en)	2017-06-29	2018-06-19	Lighting device and method in connection with a lighting device

Country Status (2)

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EP (1)	EP3422821B1 (fi)
FI (1)	FI127633B (fi)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
CN115419843B (zh) *	2022-08-30	2024-10-11	傲雷科技集团股份有限公司	一种头部组件及其移动照明设备

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
JP2015090394A (ja) *	2013-11-05	2015-05-11	キヤノン株式会社	画像表示装置、画像表示装置の制御方法、光源装置、光源装置の制御方法、及び、プログラム
JP6141347B2 (ja) *	2014-06-05	2017-06-07	キヤノン株式会社	光源装置及び表示装置
EP3095709B1 (en) *	2015-05-20	2018-01-10	Goodrich Lighting Systems GmbH	Exterior aircraft lighting device
DE102015113339A1 (de) *	2015-08-13	2017-02-16	Karl Leibinger Medizintechnik Gmbh & Co. Kg	Operationsleuchte mit Helligkeitsregulierung

2017
- 2017-06-29 FI FI20175625A patent/FI127633B/fi active IP Right Grant
2018
- 2018-06-19 EP EP18178517.1A patent/EP3422821B1/en active Active

Also Published As

Publication number	Publication date
FI20175625A1 (fi)	2018-10-31
FI127633B (fi)	2018-10-31
EP3422821A1 (en)	2019-01-02

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US10244607B1 (en)	2019-03-26	Daylight harvesting light fixture and control system for same
US11889602B2 (en)	2024-01-30	Control device having an integral reflecting structure for a sensing circuit
RU2560121C2 (ru)	2015-08-20	Пользовательский интерфейс с круговым световодным кольцом с адаптивным внешним представлением в зависимости от функции
GB2444527A (en)	2008-06-11	Dimmer switch with occupancy sensor
DK3039335T3 (en)	2018-08-20	LIGHTING CONTROL
US20080007394A1 (en)	2008-01-10	Integrated sensor and light level adjustment apparatus for "daylight harvesting"
EP3422821B1 (en)	2021-10-27	Lighting device and method in connection with a lighting device
JP2020113518A (ja)	2020-07-27	照明装置
CN114258176A (zh)	2022-03-29	灯具及灯具控制方法
JP2010033853A (ja)	2010-02-12	照明装置及び照明器具
SE533554C2 (sv)	2010-10-26	Anordning och metod för beröringsfri styrning av ljuskälla

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