JP2016143601A - Illumination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illumination device capable of improving color reproducibility of a viewing object without reference to the way in which the viewing object is viewed.SOLUTION: An illumination device 10 comprises a light source unit 12 and a power supply unit 13. The light source unit 12 includes a blue light source B, a green light source G, and a first red light source R1 and a second red light source R2 having a different peak wavelength. The power supply unit 13 turns on the blue light source B and the green light source G, and switches the outputs of the first red light source R1 and the second red light source R2 to change color rendering properties.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to an illumination device that improves color reproducibility.

  Conventionally, an average color rendering index (Ra) is used as an evaluation index for the color rendering properties of a lighting device. It is known that the higher the average color rendering index (Ra), the higher the color reproducibility of the actual visual object when the visual object is viewed directly.

  However, even when a visual target is illuminated using a lighting device having a high average color rendering index (Ra), when the visual target is photographed and broadcast by a television camera and projected on a television screen that receives the broadcast, The color reproducibility of the visual object viewed through the TV screen may be poor.

JP 2007-294379 A

  The problem to be solved by the present invention is to provide an illuminating device capable of improving the color reproducibility of a visual target regardless of how the visual target is viewed.

  The illumination device of the embodiment includes a light source unit and a power source unit. The light source unit includes a blue light source, a green light source, and first and second red light sources having different peak wavelengths. The power supply unit turns on the blue light source and the green light source and switches the outputs of the first and second red light sources to change the color rendering.

  According to the present invention, it can be expected that the color rendering property is changed in accordance with the viewing method of the viewing object, and the color reproducibility of the viewing object is improved.

It is a block diagram of the illuminating device which shows one Embodiment. It is a perspective view of an illuminating device same as the above. It is a spectral distribution figure of each light source of an illuminating device same as the above. It is a spectral distribution figure of the mixed light which raised the average color rendering index (Ra) of the illumination device same as the above. It is the spectral distribution map of the mixed light which raised the color rendering evaluation index (Qa) for television illumination of the illumination device same as the above. It is a spectral distribution figure of the mixed light which made compatible the average color-rendering evaluation number (Ra) of a illuminating device same as the above, and the color-rendering evaluation index (Qa) for television illuminations.

  Hereinafter, an embodiment will be described with reference to FIGS. 1 to 6.

  FIG. 2 shows a perspective view of the illumination device 10.

  The illumination device 10 is a spotlight used in a studio, for example. The illuminating device 10 includes a casing 11 having a projection opening 11a on the front surface, a light source section 12 that emits light disposed in the casing 11, a power supply section 13 that supplies power to the light source 12, and a projection opening 11a And a lens 14 for projecting light emitted from the light source unit 12, a bander 15 for adjusting the light distribution, a hanging tool 16 for hanging and supporting the housing 11, and the like. The lighting device 10 is suspended and installed in the studio baton by the hanging tool 16.

  FIG. 1 is a block diagram of the lighting device 10.

  The light source unit 12 includes a blue light source B, a green light source G, and first and second red light sources R1 and R2 having different peak wavelengths. The blue light source B has a peak wavelength at 440 to 475 nm, the green light source G has a peak wavelength at 555 to 570 nm, the first red light source R1 at 615 to 635 nm, and the second red light source R2 at 635 to 650 nm. For each of the light sources B, G, R1, and R2, solid light emitting elements such as LEDs are used.

  The power supply unit 13 supplies power to the light sources B, G, R1, and R2, and turns on the light sources B, G, R1, and R2. The power supply unit 13 includes a control unit 18, and the control unit 18 performs dimming control on the light sources B, G, R1, and R2 individually.

  The power supply unit 13 changes the color rendering properties by switching the outputs (lighting outputs) of the first and second red light sources R1 and R2 in accordance with the viewing method of the viewing target. The viewing method of the viewing object includes a case where the viewing object is directly viewed and a case where the viewing object is photographed and broadcast by a television camera and a video displayed on a television receiving the broadcast is viewed. For switching the outputs of the first and second red light sources R1 and R2, when outputting only the first red light source R1, when outputting only the second red light source R2, the first and second red light sources are output. The case where both R1 and R2 are output is included. Then, the control unit 18 inputs a switching signal (dimming signal) corresponding to the viewing method of the object to be viewed from a control device such as a dimming console, and controls the light sources B, G, R1, and R2. To do.

  As an embodiment of the illumination device 10, FIG. 3 shows a spectral distribution diagram of each of the light sources B, G, R1, and R2. The blue light source B has a peak wavelength of 465 nm and a full width at half maximum of 90 nm, the green light source G has a peak wavelength of 555 nm and a full width at half maximum of 90 nm, the first red light source R1 has a peak wavelength of 620 nm and a full width at half maximum of 50 nm, and the second red light source R2 has a peak wavelength of 645 nm and The full width at half maximum is 70 nm, and each shows the radiant flux per lm.

  FIG. 4 is a spectral distribution diagram when light is mixed at a luminous flux ratio of blue light source B: green light source G: first red light source R1 = 40: 38: 22. At this time, the correlated color temperature was 5300 K (Δuv = 0.002), the average color rendering index (Ra) was 94, and the color rendering index (Qa) for television illumination was 83. Therefore, the pattern of spectral distribution with a high average color rendering index (Ra) was obtained.

  The average color rendering index (Ra) is an evaluation target of color rendering when the visual object is directly viewed. The higher the average color rendering index (Ra), the higher the color reproducibility of the actual visual object. The color rendering index for TV lighting (Qa) is an index for evaluating the color rendering when airing on TV (when shooting with a TV camera and viewing the display), and is a TLCI (Television recommended by the European Broadcasting Union (EBU). Lighting Consistency Index, abbreviated symbol Qa), and the higher the color rendering index (Qa) for television lighting, the higher the color reproducibility of the video displayed on the television.

  FIG. 5 is a spectral distribution diagram when light is mixed at a luminous flux ratio of blue light source B: green light source G: second red light source R2 = 36: 30: 34. At this time, the correlated color temperature was 5290 K (Δuv = −0.005), the average color rendering index (Ra) was 86, and the TV lighting color rendering index (Qa) was 94. Therefore, it became a pattern of a spectral distribution with a high color rendering index (Qa) for television illumination.

  FIG. 6 is a spectral distribution diagram when light is mixed at a luminous flux ratio of blue light source B: green light source G: first red light source R1: second red light source R2 = 42: 32: 20: 6. At this time, the correlated color temperature was 5370 K (Δuv = −0.006), the average color rendering index (Ra) was 90, and the color rendering index (Qa) for television illumination was 91. Therefore, the average color rendering index (Ra) and the television lighting color rendering index (Qa) both have a spectral distribution pattern that becomes higher on average.

  For example, in a cooking or dance class studio, when it is usually open to the general public, the lighting device 10 is turned on with a spectral distribution pattern having a high average color rendering index (Ra) as shown in FIG. It is possible to improve the color appearance when directly viewing the object to be viewed.

  Further, when used for television photography, the lighting device 10 is turned on with a spectral distribution pattern having a high color rendering index (Qa) for television illumination as shown in FIG. Can be improved.

  Furthermore, during television shooting in a place where general visitors enter, the illumination device 10 has a spectral distribution pattern in which the average color rendering index (Ra) and the television lighting color rendering index (Qa) as shown in FIG. By turning on, it is possible to make the color appearance both when viewed directly and when viewed through the television screen.

  As described above, according to the lighting device 10, it is expected that the color rendition is changed in accordance with the viewing method of the viewing object, and the color reproducibility of the viewing object is improved in any case.

  The lighting device is not limited to a spotlight used in a studio, but can be applied to other lighting devices used in a studio, and can also be applied to, for example, a projector in a stadium.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

10 Lighting equipment
12 Light source
13 Power source B Blue light source G Green light source R1 First red light source R2 Second red light source

Claims (2)

A light source unit having a blue light source, a green light source, and first and second red light sources having different peak wavelengths;
A power supply unit that turns on the blue light source and the green light source and switches the outputs of the first and second red light sources to change the color rendering property;
An illumination device comprising: 2. The illumination according to claim 1, wherein the blue light source has a peak wavelength of 440 to 475 nm, the green light source has a peak wavelength of 555 to 570 nm, the first red light source has a peak wavelength of 615 to 635 nm, and the second red light source has a peak wavelength of 635 to 650 nm. apparatus.

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