Panasonic Intellectual Property Management Co., Ltd.

Panasonic Corporation

Naoko Takei

Kouji Nishioka

Kohji Hiramatsu

Takashi Saito

Tomoya Iwahashi

Kenichiro Tanaka

Yoko Matsubayashi

Tomoyuki Nakajima

Keiichi Yamazaki

Tohru Himeno

Hiroko Koiwa

Sayaka Nishi

Sayaka Yamaguchi

A vehicle front lamp that emits light forward includes a first light emitter that emits first emission light having a correlated color temperature of at least 3000 K and at most 7000 K, and a second light emitter that emits second emission light having a correlated color temperature of at least 3000 K and at most 7000 K. The chroma value of the first emission light is lower than the chroma value of the second emission light. The chroma value of each of the first emission light and the second emission light is derived by using the calculation method stipulated in The CIE 1997 Interim Color Appearance Model (Simple Version). The second emission light is emitted far ahead and the first emission light is emitted onto a road surface ahead, when the vehicle front lamp is mounted on a vehicle.

Vehicle front lamp

An illumination light source emits white light resulting from mixing of light emitted from an LED chip and light emitted from a plurality of phosphors. A light emission spectrum of the white light has a peak in a wavelength range from 430 nm to 460 nm. In the light emission spectrum, a proportion of optical intensity at a wavelength of 510 nm relative to optical intensity at the peak is 0.45 or more, and a proportion of optical intensity at a wavelength of 580 nm relative to the optical intensity at the peak is 0.60 or more. Furthermore, in the light emission spectrum, a proportion of optical intensity at a wavelength of 650 nm relative to the optical intensity at the wavelength of 580 nm is 0.4 or less.

Illumination light source, illumination apparatus, outdoor illumination apparatus, and vehicle headlight

Provided is a vehicle front lamp for use in a vehicle, including: a first white light source that emits first white light; a second white light source that emits second white light having a feeling of contrast index different from that of the first white light by at least 10; and a controller that controls light intensity of the first white light and light intensity of the second white light, in which chromaticity of the first white light and chromaticity of the second white light are each within a 5-step MacAdam ellipse, the first white light source and the second white light source are disposed in the vehicle front lamp so that the first white light and the second white light overlap each other on a certain illuminated surface, and the controller temporally changes a light intensity ratio between the first white light and the second white light.

Lighting equipment is provided that enables illumination light having a stable FCI to be obtained, without influence from the lighting conditions. To this end, lighting equipmentperforms control of lighting a first light-emitting elementwhile substantially not lighting a second light-emitting elementwhen a red light-emitting elementis lit under first lighting conditions where a peak wavelength of light from the red light-emitting elementhas a first value, and of lighting the second light-emitting elementwhile substantially not lighting the first light-emitting elementwhen the red light-emitting elementis lit under second lighting conditions where the peak wavelength of the light from the red light-emitting elementhas a second value, the second value being greater than the first value.

Lighting equipment, lighting device, and light-emitting module

Lighting equipmentis provided that enables illumination light having a stable FCI to be obtained, without influence from the lighting conditions. To this end, a lighting circuitperforms control of lighting a first red light source Rand lighting a white light source W while not lighting or faintly lighting a second red light source Runder first lighting conditions in which the first red light source Ris expected to produce red light with a first peak wavelength, and of lighting the second red light source Rand lighting the white light source W while not lighting or faintly lighting the first red light source Runder second lighting conditions in which the first red light source Ris expected to produce the red light with a second peak wavelength that is shifted toward a longer wavelength relative to the first peak wavelength.

Lighting equipment, illumination device and light emitting module

A lighting device is provided with a lighting unit including a light emitting element and fluorescent bodies, which emit light of different wavelengths when excited by light from the light emitting element. When a peak output value of emitted light is 100% in a range of 440-465 nm, the lighting unit emits light having an output value at 500 nm that is 35%-55%, an output value at 550 nm that is 45%-80%, an output value at 600 nm that is 45%-75%, and an output value at 640 nm that is 50%-80%. The lighting unit emits light having a color temperature of 4500-5500 K and with the output value at 640 nm in a range of 100%-120% relative to the output value at 600 nm and in a range of 85%-130% relative to the output value at 550 nm.

Lighting device to produce preferable preception of skin color

A light emitting device includes multiple types of solid state light emitting elements having different peak wavelengths from each other; and a wavelength converter including phosphors that convert a wavelength of light emitted from each of the solid state light emitting elements. The phosphors include two or more of a first phosphor, a second phosphor, and a third phosphor. The first phosphor is excited by light emitted from a solid state light emitting element having a relatively long peak wavelength, and the second phosphor is excited by light emitted from a solid state light emitting element having a relatively short peak wavelength. The third phosphor is excited by light emitted from any of the solid state light emitting elements.

Light emitting device, and illumination apparatus and system using same

A light-emitting module including: a first light source including a first light-emitting element and a wavelength converter and emitting visible light having a chromaticity within rectangle range ABCD, the wavelength converter changing a wavelength of a portion of light emitted by the first light-emitting element; and a second light source including a second light-emitting element and emitting red light. The light-emitting module emits white light by mixing the visible light and the red light, and satisfies conditions 2.0&#x2266;(S&#x2212;S)/(F&#x2212;F)&#x2266;3.0 and 0.01&#x2266;((x&#x2212;x)+(y&#x2212;y))&#x2266;0.02.

Light-emitting module, lighting device, and lighting fixture

A light emitting device includes a first luminous body having a first light source and a long wavelength cut-off filter; and a second luminous body generating light of different color from that of the first luminous body, and having a second light source and a short wavelength cut-off filter. The first and the second light source emit light in a first wavelength range and a second wavelength range extending to a longer wavelength side than the first wavelength range while overlapping with the first wavelength range, respectively. The long and the short wavelength cut-off filter cut off light having a wavelength longer than a first set wavelength and shorter longer than a second set wavelength, respectively. Thus, light emitted from the first luminous body and light emitted from the second luminous body are mixed together, such that light in between the first set wavelength and the second set wavelength is reduced.

Light emitting device, and illumination apparatus and luminaire using same

An illumination device includes an irradiation unit having a light emitting element and fluorescent bodies excited by the light from the light emitting element to radiate light of different wavelengths. The irradiation unit irradiates composite light of blue, green and red lights having half value widths of 20-40 nm, 110-150 nm and 80-110 nm and peak wavelengths of 440-465 nm, 545-555 nm and 630-650 nm, respectively. If the output value of the light in a wavelength 435-465 nm is assumed to be 100%, the output values of the lights having wavelengths of 490, 530 and 639 nm fall within 46-56%, 59-77% and 75-93%, respectively. The ratio of the output value of the light of 630 nm to that of the light of 530 nm falls within 73-86%.

Illumination device having improved visual perception of a skin color

A light emitting device includes a plurality of solid-state light emitting elements mounted on a substrate; and a wavelength converting unit covering the solid-state light emitting elements, the wavelength converting unit containing fluorescent materials. The solid-state light emitting elements include inner solid-state light emitting elements arranged in a central position of the substrate and outer solid-state light emitting elements arranged outwardly of the inner solid-state light emitting elements, and the wavelength converting unit is configured such that a probability that light propagating through the wavelength converting unit is brought into contact with the fluorescent materials in a portion of the wavelength converting unit covering the outer solid-state light emitting elements is lower than a probability that light propagating through the wavelength converting unit is brought into contact with the fluorescent materials in other portions.

Light emitting device and illumination apparatus including same

A light emitting device () includes a LED chip () as well as a mounting substrate () on which the LED chip () is mounted. Further, the light emitting device () includes a cover member () and a color conversion layer (). The cover member () is formed to have a dome shape and is made of a translucency inorganic material. The color conversion layer () is formed to have a dome shape and is made of a translucency material (such as, a silicone resin) including a fluorescent material excited by light emitted from the LED chip () and emitting light longer in wavelength than the light emitted from the LED chip (). The cover member () is attached to the mounting substrate () such that there is an air layer () between the cover member () and the mounting substrate (). The color conversion layer () is superposed on a light-incoming surface or a light-outgoing surface of the cover member ().

Growing community of inventors

Osaka, Japan

Naoko Takei