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Illumination light source
| Details |
Inventors: Shimizu, Masanori; Shimomura, Yoko; Nagai, Hideo; Tamura, Tetsushi; Matsui, Nobuyuki;
Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP)
Primary Examiner: Ward; John Anthony
Assistant Examiner: Zeade; Bertrand
Attorney, Agent or Firm: Harness, Dickey & Pierce, P.L.C.
An illumination light source includes four different types of LEDs, namely a blue light-emitting diode 11 emitting blue light, a blue-green light-emitting diode 12 emitting blue-green light, an orange light-emitting diode 13 emitting orange light and a red light-emitting diode 14 emitting red light. Thus, an illumination light source having high efficiency and high color rendering performance is provided. |
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DETAILED DESCRIPTION Therefore, with the foregoing in mind, it is a main object of the present invention to provide an LED illumination light source having high efficiency and high color rendering performance.
An illumination light source according to the present invention includes four types of light-emitting diodes, wherein the four types of light-emitting diodes are a blue light-emitting diode emitting blue light, a blue-green light-emitting diode emitting blue-green light, an orange light-emitting diode emitting orange light and a red light-emitting diode emitting red light.
In an embodiment, the blue light-emitting diode has an emission wavelength peak at 420 to 470 nm, the blue-green light-emitting diode has an emission wavelength peak at 500 to 550 nm, the orange light-emitting diode has an emission wavelength peak at 570 to 600 nm, and the red light-emitting diode has an emission wavelength peak at 610 to 660 nm.
In a preferred embodiment, the blue light-emitting diode has an emission wavelength peak at 450 to 470 nm, the blue-green light-emitting diode has an emission wavelength peak at 510 to 540 nm, the orange light-emitting diode has an emission wavelength peak at 580 to 600 nm, and the red light-emitting diode has an emission wavelength peak at 625 to 650 nm.
In another embodiment, the emission wavelength peaks of the four types of light-emitting diodes are different from corresponding hypothetical emission wavelength peaks that are calculated based on results of a theoretical simulation.
It is preferable that the illumination light source has a general color rendering index of at least 90.
It is preferable that when the illumination light source has a correlated color temperature of less than 5000 K and when a color rendering performance of the illumination light source is evaluated using a blackbody source as a standard source, the illumination light source has a spectral distribution in which the luminous intensities of the blue light-emitting diode, the blue-green light-emitting diode, the orange light-emitting diode and the red light-emitting diode increase in this order
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