EP2685786A2 - Dispositif dýéclairage - Google Patents

Dispositif dýéclairage Download PDF

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Publication number
EP2685786A2
EP2685786A2 EP13173318.0A EP13173318A EP2685786A2 EP 2685786 A2 EP2685786 A2 EP 2685786A2 EP 13173318 A EP13173318 A EP 13173318A EP 2685786 A2 EP2685786 A2 EP 2685786A2
Authority
EP
European Patent Office
Prior art keywords
unit
output
light
wavelength band
long wavelength
Prior art date
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.)
Granted
Application number
EP13173318.0A
Other languages
German (de)
English (en)
Other versions
EP2685786B1 (fr
EP2685786A3 (fr
Inventor
Sayaka Nishi
Takashi Saito
Hiroki Noguchi
Naohiro Toda
Ayako Tsukitani
Kensuke Yamazoe
Toshihide Mori
Hiroshi Hamano
Kouichi Wada
Yoshinori Karasawa
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.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Corp
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.)
Filing date
Publication date
Priority claimed from JP2012157686A external-priority patent/JP2013058469A/ja
Application filed by Panasonic Corp filed Critical Panasonic Corp
Publication of EP2685786A2 publication Critical patent/EP2685786A2/fr
Publication of EP2685786A3 publication Critical patent/EP2685786A3/fr
Application granted granted Critical
Publication of EP2685786B1 publication Critical patent/EP2685786B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light
    • H05B45/24—Controlling the colour of the light using electrical feedback from LEDs or from LED modules

Definitions

  • the present invention relates to a lighting device.
  • Japanese Utility Model No. 3159820 describes an example of a lighting device including a main power supply and a backup power supply. When the supply of power from the main power supply to a light source is interrupted, the light source is supplied with power from the backup power supply.
  • the lighting device of Japanese Utility Model No. 3159820 further includes a main light source and a backup light source.
  • the backup light source is formed by an LED.
  • the low power consumption backup (LED) light source is used so that the backup power supply, which is a rechargeable battery (battery cell), may be used for a relatively long time.
  • Japanese Laid-Open Patent Publication No. 2005-11812 discloses a lighting device that uses three LED light sources having different wavelengths and executes spectral control to generate light in accordance with a mesopic vision environment. Further, the lighting device of Japanese Laid-Open Patent Publication No. 2005-11812 uses LED light sources, and thus, consumes less power than fluorescent lamps and incandescent light bulbs.
  • Such a lighting device uses three types of LED light sources having different wavelengths to improve visibility under a mesopic vision environment.
  • the LED light sources increase the number of components.
  • One aspect of the present invention is a lighting device provided with an illumination unit including two or less LED light sources.
  • the illumination unit uses the two or less LED light sources to emit light of a short wavelength band and light of a long wavelength band.
  • An output varying unit functions to vary an output of at least the long wavelength band light.
  • the output varying unit receives a varying signal, the output varying unit functions to decrease the output of at least the long wavelength band light.
  • a lighting device 10 according to one embodiment of the present invention will now be described with reference to the drawings.
  • the lighting device 10 of the present embodiment includes an illumination unit 11 and an activation circuit 12.
  • the illumination unit 11 externally emits light, and the activation circuit 12 controls the activation of the illumination unit 11.
  • the illumination unit 11 includes two LED light sources 21 and 22 and a fluorescent body 23.
  • the LED light sources 21 and 22 emit different types of blue light.
  • the fluorescent body 23 covers a light emitting surface of the LED light source 22. Further, the fluorescent body 23 emits yellow light when excited upon absorption of light from the LED light source 22.
  • the LED light source 21 emits a short wavelength light
  • the fluorescent body 23 and the LED light source 22 emit a long wavelength light.
  • the activation circuit 12 of the lighting device 10 includes a main activation circuit unit 31, a backup activation circuit unit 32, a switch circuit unit 33, an activation detection unit 34, a charge unit 35, a power unit 36, a switch 37, an output varying unit 38, and a time control unit 39.
  • the main activation circuit unit 31 is electrically connected to an AC power supply D.
  • the switch circuit unit 33 electrically connects the main activation circuit unit 31 to the two LED light sources 21 and 22 of the illumination unit 11.
  • the two LED light sources 21 and 22 are supplied with power from the AC power supply D through the main activation circuit unit 31 and the switch circuit unit 33. This allows for activation of the two LED light sources 21 and 22.
  • the main activation circuit unit 31 and the AC power supply D form a main power supply unit.
  • the backup activation circuit unit 32 is electrically connected to the charge unit 35.
  • the output varying unit 38 and the switch circuit unit 33 connect the backup activation circuit unit 32 to the LED light source 21 of the illumination unit 11.
  • the charge unit 35 is electrically connected to the power unit 36.
  • the switch 37 which may be turned on and off, electrically connects the power unit 36 to the AC power supply D. When the switch 37 is turned on, the charge unit 35 accumulates power supplied from the AC power supply D through the power unit 36.
  • the LED light source 22 is supplied with power from the charge unit 35 through the backup activation circuit unit 32. This allows for activation of the LED light source 22.
  • the backup activation circuit unit 32 and the charge unit 35 form a backup power supply unit.
  • the activation detection unit 34 detects whether or not power is supplied from the AC power supply D to the main activation circuit unit 31. When the activation detection unit 34 determines that the LED light source 21 is not activated (deactivated) the activation detection unit 34 provides the output varying unit 38 with a varying signal. Upon receipt of the varying signal, the output varying unit 38 controls the switch circuit unit 33 to switch to a power line extending through the backup activation circuit unit 32. More specifically, upon receipt of the varying signal, the output varying unit 38 functions to supply the power from the backup activation circuit unit 32 to the LED light source 21 through the output varying unit 38 and the switch circuit unit 33.
  • the main activation circuit unit 31 controls the activation of the two LED light sources 21 and 22. For example, when an activation operation is performed with an operation switch (not shown), the LED light sources 21 and 22 are activated, and the illumination unit 11 emits white light (refer to Fig. 3A ). When the switch 37 is ON, power from the AC power supply D is accumulated in the charge unit 35 through the power unit 36.
  • the activation detection unit 34 When the supply of power from the AC power supply D is interrupted (abnormal situation) by a wire breakage or the like, the activation detection unit 34 provides the output varying unit 38 with a varying signal. Upon receipt of the varying signal, the output varying unit 38 controls the switch circuit unit 33 to switch to the power line extending through the backup activation circuit unit 32. Thus, the backup activation circuit unit 32 is supplied with power from the charge unit 35 instead of the AC power supply D. Then, for example, when an activation operation is performed with an operation switch (not shown), the LED light source 21 is activated, and the illumination unit 11 emits blue light (refer to Fig. 3B ). In this case, the LED light source 22 covered by the yellow fluorescent body 23 is deactivated. This decreases the long wavelength band light output from the LED light source 22 to zero.
  • the human retina has photoreceptor cells including rods, which function under a mesopic vision situation or a scotopic vision situation.
  • the activation of the LED light source 21 that emits short wavelength band light e.g., blue light
  • the lighting device 10 of the present embodiment has the advantages described below.
  • the lighting device 10 includes the illumination unit 11, which includes the two LED light sources 21 and 22, and emit short wavelength band light and long wavelength band light, and the output varying unit 38, which is capable of varying the long wavelength band light output from the illumination unit 11.
  • the output varying unit 38 decreases the output of the LED light source 22 to zero.
  • the LED light source 22 is covered by the fluorescent body 23 that emits the long wavelength band light of the illumination unit 11.
  • the output varying unit 38 activates only the LED light source 21 that emits short wavelength band light. Rods function under a mesopic vision situation or a scotopic vision situation. Thus, the activation of the LED light source 21 that emits short wavelength band light (e.g., blue light) improves visibility.
  • short wavelength band light e.g., blue light
  • the use of the two LED light sources 21 and 22 as a light source reduces power consumption of the lighting device 10. Further, the number of the LED light sources 21 and 22 is reduced in comparison with the prior art. This, in turn, reduces the number of components of the lighting device 10.
  • the activation detection unit 34 provides the output varying unit 38 with a varying signal. Upon receipt of the varying signal, the output varying unit 38 controls the switch circuit unit 33 to decrease the output of long wavelength band light. In this manner, changing the power supply source allows for the output varying unit 38 to decrease the output of long wavelength band light.
  • the output varying unit 38 may be configured to gradually decrease the long wavelength band light. This allows for gradual shifting to only the short wavelength band light, and allows for reduction in the time used chromatic adaptation. Thus, a person would not feel discomfort with such a configuration.
  • the activation circuit 12 includes the time control unit 39 electrically connected to the output varying unit 38.
  • the time control unit 39 measures the elapsed time from when the output varying unit 38 receives the varying signal.
  • the output varying unit 38 controls the switching of the switch circuit unit 33 after the predetermined time elapses based on the measured elapsed time.
  • the illumination unit 11 includes the two LED light sources 21 and 22 of substantially the same color (same wavelength band), and the LED light source 22 is covered by the fluorescent body 23 to emit white light.
  • an LED light source 41 that emits blue light and an LED light source 42 that emits light in the long wavelength band such as orange color may be used to emit white light by combining long wavelength band light, such as the blue light and the orange light.
  • the two LED light sources 21 and 22 are activated during a normal operation.
  • the illumination unit 11 may include an LED light source 43 that emits white light and an LED light source 44 that emits blue light.
  • the LED light source 43 may be activated to emit white light.
  • the LED light source 44 may be activated to emit blue light.
  • the illumination unit 11 may include an LED light source 45 that emits blue light and a fluorescent body 46 that emits blue light and a fluorescent body 46 that emits yellow (orange) light when excited by the light of the LED light source 45. Further, the illumination unit 11 includes an output varying unit 47 that decreases the output of long wavelength band light by cutting or moving the fluorescent body 46 during a backup operation. In this configuration, under a backup operation, the light (blue light) may be emitted from only the LED light source 45. Further, the number of LED light sources 45 may be reduced.
  • the illumination unit 11 may include an LED light source 51 that emits white light, a liquid crystal filter 52 arranged opposing an emission surface of the LED light source 51, and a liquid crystal control unit 53 that controls the liquid crystal filter 52. This allows the liquid crystal control unit 53 to control the liquid crystal filter 52 and emit light having a short wavelength during a backup situation.
  • the illumination unit 11 may include a light flux measurement unit 56 that measures the light flux of the two LED light sources 21 and 22.
  • the output varying unit 38 decreases the output of the long wavelength band light.
  • Fig. 8 does not show the backup activation circuit unit 32 and the charge unit 35 that are used during a backup operation.
  • the LED light source 22 emits long wavelength band light
  • the fluorescent body 23 and the LED light source 21 emit short wavelength band light
  • the illumination unit 11 may include a short wavelength light source unit and a long wavelength light source unit that emits, to the short wavelength light source, short wavelength band light having a relatively small output (spectral intensity) and long wavelength band light having a relatively large output.
  • the short wavelength light source unit includes, for example, an LED light source and a fluorescent body excited by the light of the LED light source.
  • the short wavelength light source unit includes, for example, a first peak wavelength P1 in the proximity of approximately 450 nm and a second peak wavelength P2 in the proximity of approximately 550 nm.
  • the short wavelength LED light source is configured so that the light output at the second peak wavelength P2 is approximately 0.3.
  • the short wavelength light source unit is configured so that the correlated color temperature is 10000 K, the average color rendering index Ra is 73, and the S/P ratio is 2.28.
  • the S/P ratio is the ratio of scotopic vision brightness Ls, which is calculated by integrating the spectral luminous efficiency V' ( ⁇ ) under scotopic vision and the spectral characteristics of a lamp, and the photopic vision brightness Lp, which is calculated by the spectral luminous efficiency V ( ⁇ ) under photopic vision and the spectral characteristics of a lamp.
  • the long wavelength light source unit includes, for example, an LED light source and a fluorescent body excited by the light of the LED light source.
  • the long wavelength light source unit emits light of a short wavelength band having a relatively small light output and light of a long wavelength band having a relatively large light output to the short wavelength light source unit.
  • the long wavelength light source unit emits light including spectrum A, shown by the solid line in Fig. 10 , and spectrum B, shown by the broken line in Fig. 10 .
  • the spectrum A of the long wavelength light source unit has a first peak wavelength P1 in the proximity of approximately 455 nm, a second peak wavelength P2 in the proximity of approximately 490 nm, and a third peak wavelength P3 in the proximity of approximately 600 nm.
  • the long wavelength light source unit that emits the spectrum A is configured so that the light output at the second peak wavelength P2 is approximately 0.9 and the light output at the third peak wavelength P3 is approximately 0.53. Further, the long wavelength light source unit that emits the spectrum A is configured so that the correlated color temperature is 6800 K, the average color rendering index Ra is 85, and the S/P ratio is 2.79.
  • spectrum X shown by the solid line indicates the spectrum of synthesized light when activating the short wavelength light source unit and the long wavelength light source emitting the spectrum A.
  • the synthesized light has a correlated color temperature of 8000 K, an average color rendering index Ra of 95, and an S/P ratio of 2.62.
  • the long wavelength light source unit that emits the spectrum B shown by the broken line in Fig. 10 , has a first peak wavelength P1 in the proximity of approximately 440 nm and a second peak wavelength P2 in the proximity of approximately 550 nm.
  • the long wavelength light source unit that emits the spectrum B is configured so that the light output at the second peak wavelength P2 is approximately 0.43.
  • the long wavelength light source unit that emits the spectrum B is configured so that the correlated color temperature is 7100 K, the average color rendering index Ra is 70, and the S/P ratio is 2.04.
  • spectrum Y shown by the broken line indicates the spectrum of synthesized light when activating the short wavelength light source unit and the long wavelength light source emitting the spectrum B.
  • the synthesized light has a correlated color temperature of 8100 K, an average color rendering index Ra of 71, and an S/P ratio of 2.14.
  • the activation detection unit 34 detects whether or not the main activation circuit unit 31 is supplied with power from the AC power supply D.
  • the main activation circuit unit 31 controls the activation of the short and long wavelength light source units in the illumination unit 11. For example, when an activation operation is performed with an operation switch (not shown), the short and long wavelength light source units are activated so that the illumination unit 11 emits white light (refer to Fig. 11 ).
  • the activation detection unit 34 When the supply of power from the AC power supply D is interrupted due to a wire breakage or the like, the activation detection unit 34 provides the output varying unit 38 with a varying signal. Upon receipt of the varying signal, the output varying unit 38 controls the switch circuit unit 33 to switch to the power line extending through the backup activation circuit unit 32. This supplies the backup activation circuit unit 32 with power from the charge unit 35 instead of the AC power supply D. Then, for example, when an activation operation is performed with an operation switch (not shown), only the short wavelength light source unit is activated, and the illumination unit 11 emits light having a correlated color temperature of 10000 K (refer to Fig. 9 ).
  • Light having a correlated color temperature of 10000 K is in a correlated color temperature range (2500 K to 10000 K) used as an LED module for emitting white light as specified in JIS C8155:2010 "General Lighting LED Module, Capacity Requirements".
  • white light may be emitted during a backup operation.
  • the long wavelength light source unit is deactivated, only the short wavelength light source unit having a relatively high color temperature is activated.
  • the S/P ratio during the backup operation is higher than that during a normal operation.
  • the light from the short wavelength light source unit, as a single body has an average color rendering index Ra of 70 or greater. Thus, sufficiently high color rendering may be maintained.
  • the short wavelength light source unit and the long wavelength light source unit of the above modified examples are activated with the same light flux during normal operation. However, the light flux ratio may be varied. Further, in the above modified examples, the long wavelength light source unit is activated. Instead, the long wavelength light source unit may be dimmed. In this manner, the long wavelength light source unit may be activated or dimmed so that in the light output of the light emitted from the illumination unit 11, the light output of the long wavelength band is greater than the light output of the short wavelength band.
  • the short wavelength light source unit does not have to have the characteristics shown in Fig. 9 and may have the characteristics shown by the solid line or broken line in Fig. 12 .
  • the output varying unit 38 when receiving the varying signal, supplies power from the backup activation circuit unit 32 to the LED light source 21 through the output varying unit 38 and the switch circuit unit 33.
  • the output varying unit 38 may supply power from the backup activation circuit unit 32 through only the switch circuit unit 33.
  • the activation detection unit 34 may provide the varying signal to the switch circuit unit 33 so that the switch circuit unit 33 switches to a power line extending through the backup activation circuit unit 32.

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  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP13173318.0A 2012-07-13 2013-06-24 Dispositif d'éclairage Active EP2685786B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2012157686A JP2013058469A (ja) 2011-08-18 2012-07-13 照明装置

Publications (3)

Publication Number Publication Date
EP2685786A2 true EP2685786A2 (fr) 2014-01-15
EP2685786A3 EP2685786A3 (fr) 2014-08-27
EP2685786B1 EP2685786B1 (fr) 2017-09-13

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ID=48670431

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EP13173318.0A Active EP2685786B1 (fr) 2012-07-13 2013-06-24 Dispositif d'éclairage

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EP (1) EP2685786B1 (fr)
CN (1) CN103542283B (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03159820A (ja) 1989-11-16 1991-07-09 Daihatsu Motor Co Ltd 自動車用パワーユニット装置
JP2005011812A (ja) 2003-06-18 2005-01-13 General Electric Co <Ge> 薄明視照明条件下で視覚認知を改善するための光源

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6577073B2 (en) * 2000-05-31 2003-06-10 Matsushita Electric Industrial Co., Ltd. Led lamp
JP4458804B2 (ja) * 2003-10-17 2010-04-28 シチズン電子株式会社 白色ｌｅｄ
JP3977364B2 (ja) * 2004-09-03 2007-09-19 キヤノン株式会社 露光装置およびデバイス製造方法
CN201221693Y (zh) * 2008-06-11 2009-04-15 朱志明 Led球泡灯
CN201242128Y (zh) * 2008-06-27 2009-05-20 中海阳(北京)新能源电力工程有限公司 一种led球泡灯
TWI374996B (en) * 2009-04-15 2012-10-21 Semi Photonics Co Ltd Light emitting device with high cri and high luminescence efficiency
US8264155B2 (en) * 2009-10-06 2012-09-11 Cree, Inc. Solid state lighting devices providing visible alert signals in general illumination applications and related methods of operation
JP3159820U (ja) * 2010-03-16 2010-06-03 彰男 糠谷 点灯装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03159820A (ja) 1989-11-16 1991-07-09 Daihatsu Motor Co Ltd 自動車用パワーユニット装置
JP2005011812A (ja) 2003-06-18 2005-01-13 General Electric Co <Ge> 薄明視照明条件下で視覚認知を改善するための光源

Also Published As

Publication number Publication date
CN103542283B (zh) 2016-03-16
CN103542283A (zh) 2014-01-29
EP2685786B1 (fr) 2017-09-13
EP2685786A3 (fr) 2014-08-27

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