Color temperature-regulable led light

• US 20040264193A1
• Filed: 08/16/2004
• Published: 12/30/2004
• Est. Priority Date: 08/23/2001
• Status: Abandoned Application

• Current Assignee: Yukiyasu Okumura
• Original Assignee: Yukiyasu Okumura
• Inventors: Okumura, Yukiyasu
• Application Number:
  US10/487,528
• Publication Number:
  US 20040264193A1
• Time in Patent Office: Days
• US Class Current: 362/276
• CPC Class Codes: A61B 2090/308 Lamp handles
• CPC Class Codes: A61B 2090/309 using white LEDs
• CPC Class Codes: A61B 90/30 Devices for illuminating a surgical field, the devices having an interrelation with other surgical devices or with a surgical procedure
• CPC Class Codes: A61B 90/36 Image-producing devices or illumination devices not otherwise provided for
• CPC Class Codes: F21S 10/02 changing colors F21S10/002 - F21S10/007, F21S10/04 take precedence
• CPC Class Codes: F21V 21/403 for operation or dentist lamps
• CPC Class Codes: F21V 23/0435 activated by remote control means
• CPC Class Codes: F21W 2131/205 for operating theatres
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/30 Driver circuits

Abstract

A currently-available white LED can be modified to freely set a color temperature as well as to improve a color rendering property. A correction-color LED or LEDs having a peak wavelength in a specific wavelength region in association with a white LED are provided to make a color temperature-regulable LED which permit the correction of not only a color temperature but also a color rendering property by means of color-mixture of the correction-color LED and the white LED considering the color temperature and a spectrum distribution of the white LED. The color temperature-regulable LED is especially useful as an shadowless operating light, a living room light and a decorative light.

Claims

1. A LED lighting device comprising (1) a white LED light source a color temperature of a light emitted from which is adjusted to a midpoint color temperature X between a predetermined minimum color temperature Xmin (K) and a predetermined maximum color temperature (K) on a black body radiation line, (2) a first correction LED light source having an emission spectrum a peak wavelength of which is positioned on or around a cross-point L1 (nm) defined by an intersection of an extension of a line segment between the minimum color temperature Xmin and the midpoint color temperature X with a longer wavelength side circumference of a chromaticity diagram, and (3) a second correction LED light source having an emission spectrum a peak wavelength of which is positioned on or around a cross-point S1 (nm) defined by an intersection of an extension of a line segment between the maximum color temperature Xmax and the midpoint color temperature X with a shorter wavelength side circumference of the chromaticity diagram, wherein a resultant color temperature from a combination of the white LED light source with the first or the second correction LED light source can be adjusted depending on a mixing ratio of spectra intensities of the two sources in such a manner as to get a color approaching the minimum color temperature or the maximum color temperature.

18. A LED lighting device according to claim 1, which comprises (1) a main light source LED which is composed in combination of a LED an emission peak wavelength of which is adjusted to a blue region of 430 to 470 nm and a fluorescent substance which is excited by the LED and a fluorescent peak wavelength of which is adjusted to a yellow region of 530 to 570 nm,

(2) an auxiliary light source LED comprising a blue LED an emission peak wavelength of which is adjusted to an orange region of 430 to 470 nm and an orange LED a peak wavelength of which is adjusted to an orange region of 590 to 630 nm, and wherein a resultant color temperature from either of the main light source LED and the auxiliary light source LED or a combination of both the LEDs can be adjusted within a range of 3000 to 8000°

K as a whole.

19. A LED lighting device as set forth in claim 18, wherein the main light source LED has a ratio between an intensity of its Garnet fluorescent layer transmitting spectrum and an intensity of its Garnet fluorescent layer emitting spectrum set to 2:

1 to 1;

4.

20. A LED lighting device as set forth in claim 1, wherein further comprising a mouth-piece to be connected to an AC power source, a transformer for transforming the AC power source, and a light regulator to be connected to the transformer and to set and supply a predetermined DC voltage to the main light source LED and the auxiliary LED respectively.

21. A LED lighting device as set forth in claim 1, wherein further comprising a mouth-piece to be connected to a DC power source for a shadowless lighting device, a transformer, and a light regulator to be connected to the transformer and to set and supply a predetermined DC voltage to the main light source LED and the auxiliary LED respectively.

22. A LED lighting device as set forth in claim 1, wherein a base board to which the main light source LED and the auxiliary light source LED are attached is provided in its front with a spherical reflective mirror to obtain a white light without color unevenness by color mixture of the reflected lights.

23. A LED lighting device as set forth in claim 1, wherein further comprising a system for adjusting an quantity of light from the auxiliary light source with respect to the main light source by manipulating a switch or a remote control for that adjustment.

24. A LED lighting device as set forth in claim 1, wherein further comprising a system for adjusting an quantity of light from the auxiliary light source with respect to the main light source by manipulating a switch or a remote control for that adjustment so as to select an optimal color temperature for an operation area.

25. A LED lighting device as set forth in claim 1, wherein further comprising a system for adjusting an quantity of light from the auxiliary light source with respect to the main light source by manipulating a switch or a remote control for that adjustment so as to select a color temperature for a desired area.

26. A LED lighting device as set forth in claim 1, wherein further comprising a system for adjusting an quantity of light from the auxiliary light source with respect to the main light source by manipulating a switch or a remote control for that adjustment so as to select a desired atmospheric color temperature.

2. A LED lighting device comprising (1) a white LED light source which is adjusted to a predetermined minimum color temperature Xlow (K) on a black body radiation line, and (2) a third correction LED source having an emission spectrum a peak wavelength of which is positioned on or around a cross-point S2 (nm) defined by an intersection of an extension of a line segment between the minimum color temperature Xlow and at least one of the color temperatures X selected on a black body radiation line on the a higher temperature side with a shorter wavelength side circumference of the chromaticity diagram, and wherein a resultant color temperature from a combination of the white LED light source with the third correction LED light source can be adjusted depending on a mixing ratio of spectral intensities of the two sources in such a manner as to get a color approaching the maximum color temperature.

27. A LED lighting device according to claim 2, which comprises (1) a main light source LED which is composed in combination of a LED an emission peak wavelength of which is adjusted to a blue region of 430 to 470 nm and a fluorescent substance which is excited by the LED and a fluorescent peak wavelength of which is adjusted to a yellow region of 530 to 570 nm,

(2) an auxiliary light source LED comprising a blue LED an emission peak wavelength of which is adjusted to an orange region of 430 to 470 nm and an orange LED a peak wavelength of which is adjusted to an orange region of 590 to 630 nm, and wherein a resultant color temperature from either of the main light source LED and the auxiliary light source LED or a combination of both the LEDs can be adjusted within a range of 3000 to 8000°

K as a whole.

28. A LED lighting device as set forth in claim 27, wherein the main light source LED has a ratio between an intensity of its Garnet fluorescent layer transmitting spectrum and an intensity of its Garnet fluorescent layer emitting spectrum set to 2:

1 to 1;

4.

29. A LED lighting device as set forth in claim 2, wherein further comprising a mouth-piece to be connected to an AC power source, a transformer for transforming the AC power source, and a light regulator to be connected to the transformer and to set and supply a predetermined DC voltage to the main light source LED and the auxiliary LED respectively.

30. A LED lighting device as set forth in claim 2, wherein further comprising a mouth-piece to be connected to a DC power source for a shadowless lighting device, a transformer, and a light regulator to be connected to the transformer and to set and supply a predetermined DC voltage to the main light source LED and the auxiliary LED respectively.

31. A LED lighting device as set forth in claim 2, wherein a base board to which the main light source LED and the auxiliary light source LED are attached is provided in its front with a spherical reflective mirror to obtain a white light without color unevenness by color mixture of the reflected lights.

32. A LED lighting device as set forth in claim 2, wherein further comprising a system for adjusting an quantity of light from the auxiliary light source with respect to the main light source by manipulating a switch or a remote control for that adjustment.

33. A LED lighting device as set forth in claim 2, wherein further comprising a system for adjusting an quantity of light from the auxiliary light source with respect to the main light source by manipulating a switch or a remote control for that adjustment so as to select an optimal color temperature for an operation area.

34. A LED lighting device as set forth in claim 2, wherein further comprising a system for adjusting an quantity of light from the auxiliary light source with respect to the main light source by manipulating a switch or a remote control for that adjustment so as to select a color temperature for a desired area.

35. A LED lighting device as set forth in claim 2, wherein further comprising a system for adjusting an quantity of light from the auxiliary light source with respect to the main light source by manipulating a switch or a remote control for that adjustment so as to select a desired atmospheric color temperature.

3. A LED lighting device comprising (1) a white LED light source which is adjusted to a predetermined maximum color temperature Xhigh (K) on a black body radiation line, and (2) a fourth correction LED source having an emission spectrum a peak wavelength of which is positioned on or around a cross-point S2 (nm) defined by an intersection of an extension of a line segment between the maximum color temperature Xhigh and at least one of the color temperatures X selected on a black body radiation line on the a higher temperature side with a longer wavelength side circumference of the chromaticity diagram, and wherein a resultant color temperature from a combination of the white LED light source with the fourth correction LED light source can be adjusted depending on a mixing ratio of spectral intensities of the two sources in such a manner as to get a color approaching the minimum color temperature.

36. A LED lighting device according to claim 3, which comprises (1) a main light source LED which is composed in combination of a LED an emission peak wavelength of which is adjusted to a blue region of 430 to 470 nm and a fluorescent substance which is excited by the LED and a fluorescent peak wavelength of which is adjusted to a yellow region of 530 to 570 nm,

(2) an auxiliary light source LED comprising a blue LED an emission peak wavelength of which is adjusted to an orange region of 430 to 470 nm and an orange LED a peak wavelength of which is adjusted to an orange region of 590 to 630 nm, and wherein a resultant color temperature from either of the main light source LED and the auxiliary light source LED or a combination of both the LEDs can be adjusted within a range of 3000 to 8000°

K as a whole.

37. A LED lighting device as set forth in claim 36, wherein the main light source LED has a ratio between an intensity of its Garnet fluorescent layer transmitting spectrum and an intensity of its Garnet fluorescent layer emitting spectrum set to 2:

1 to 1;

4.

38. A LED lighting device as set forth in claim 3, wherein further comprising a mouth-piece to be connected to an AC power source, a transformer for transforming the AC power source, and a light regulator to be connected to the transformer and to set and supply a predetermined DC voltage to the main light source LED and the auxiliary LED respectively.

39. A LED lighting device as set forth in claim 3, wherein further comprising a mouth-piece to be connected to a DC power source for a shadowless lighting device, a transformer, and a light regulator to be connected to the transformer and to set and supply a predetermined DC voltage to the main light source LED and the auxiliary LED respectively.

40. A LED lighting device as set forth in claim 3, wherein a base board to which the main light source LED and the auxiliary light source LED are attached is provided in its front with a spherical reflective mirror to obtain a white light without color unevenness by color mixture of the reflected lights.

41. A LED lighting device as set forth in claim 3, wherein further comprising a system for adjusting an quantity of light from the auxiliary light source with respect to the main light source by manipulating a switch or a remote control for that adjustment.

42. A LED lighting device as set forth in claim 3, wherein further comprising a system for adjusting an quantity of light from the auxiliary light source with respect to the main light source by manipulating a switch or a remote control for that adjustment so as to select an optimal color temperature for an operation area.

43. A LED lighting device as set forth in claim 3, wherein further comprising a system for adjusting an quantity of light from the auxiliary light source with respect to the main light source by manipulating a switch or a remote control for that adjustment so as to select a color temperature for a desired area.

44. A LED lighting device as set forth in claim 3, wherein further comprising a system for adjusting an quantity of light from the auxiliary light source with respect to the main light source by manipulating a switch or a remote control for that adjustment so as to select a desired atmospheric color temperature.

4-17. -17:

canceled

45. A LED lighting device comprising (1) a first blue LED an emission peak wavelength of which is adjusted to a blue region of 430 to 470 nm,

(2) a second LED a peak wavelength of which is adjusted to a yellow region of 530 to 670 nm, and

(3) a third LED a peak wavelength of which is adjusted to an orange region of 590 to 630 nm, and wherein the first and the third LEDs are dispersed in a group of the second LEDs formed as a main portion, and

a resultant color temperature from a combination of the LEDs can be adjusted within a range of 3000 to 8000°

K as a whole by adjusting a relative emission intensity of the first LED or the third LED with respect to the second LED.

46. A LED lighting device as set forth in claim 45, wherein the first and the third LEDs are dispersed in the group of the second LEDs so as to have a ratio of 1±

1;

3;

2±

1 as a whole.

47. A LED lighting device comprising (1) a main light source LED which is composed in combination of a LED an emission peak wavelength of which is adjusted to a blue region of 430 to 470 nm and a YAG fluorescent substance which is excited by the LED and a fluorescent peak wavelength of which is adjusted to a yellow region of 530 to 570 nm,

(2) one kind of or two and more kinds of auxiliary light source LEDs which are suitably dispersed in a group of the main light source LEDs and peak wavelengths of which are adjusted to an invisible region, and wherein a fluorescent substance which emits a fluorescence adapted to be excited by the auxiliary LED and having its peak wavelength in a blue region of 430 to 490 nm or a fluorescence having a peak wavelength in an orange to red region of 590 nm to 700 nm is contained in a filter which covers the LEDs, and a resultant color temperature of a filter transmitting wavelength can be adjusted within a range of 3000 to 8000°

K by mixing an emission spectrum from the main light source LED with a fluorescent spectrum from the filter.

48. A LED lighting device comprising (1) a main light source LED which is composed in combination of a LED an emission peak wavelength of which is adjusted to a blue region of 430 to 470 nm and a YAG fluorescent substance which is excited by the LED and a fluorescent peak wavelength of which is adjusted to a yellow region of 530 to 570 nm,

(2) a color temperature converting filter which covers the LED, and wherein a resultant color temperature of an emission wavelength from the LED can be adjusted within a range of 3000 to 8000°

K by the filter.

49. A LED lighting device comprising (1) a main light source LED which is composed in combination of a LED an emission peak wavelength of which is adjusted to a blue region of 430 to 470 nm and auxiliary LEDs which are suitably dispersed in a group of of the main light source LEDs and an emission peak wavelength of which is adjusted to an invisible region, and wherein a YAG fluorescent substance which is excited by the main light source to emit a fluorescence having its peak wavelength in a yellow region of 530 to 570 nm, a fluorescent substance which is excited by the auxiliary light to emit a fluorescence having its peak wavelength in a blue region of 430 to 490 nm and a fluorescent substance which has its peak wavelength in an orange to red region of 590 nm to 700 nm are contained in a filter which covers the LEDs, and a resultant color temperature of a filter transmitting wavelength can be adjusted within a range of 3000 to 8000°

K by adjusting an intensity of an emission spectrum from the main light source LED and an intensity of an emission spectrum from the auxiliary LED.