Citizen Electronics Co., Ltd.

Hideyoshi Horie

It is an object of the present invention to improve light source efficiency of 'a light-emitting device capable of realizing a natural, vivid, highly visible and comfortable appearance of colors or an appearance of objects' already arrived at by adopting a spectral power distribution having a shape completely different from the shape of conventionally known spectral power distributions while maintaining favorable color appearance characteristics.

Illumination method using a light-emitting device

Described herein are light-emitting devices that incorporate at least one light-emitting element and that satisfy predetermined requirements, in which &#x3d5;(&#x3bb;) emitted from the light-emitting device satisfies predetermined conditions described herein.

Light-emitting device, method for designing light-emitting device, method for driving light-emitting device, illumination method, and method for manufacturing light-emitting device

To provide an illumination method and a light-emitting device which are capable of achieving, under an indoor illumination environment where illuminance is around 5000 lx or lower when performing detailed work and generally around 1500 lx or lower, a color appearance or an object appearance as perceived by a person, will be as natural, vivid, highly visible, and comfortable as though perceived outdoors in a high-illuminance environment, regardless of scores of various color rendition metric. Light emitted from the light-emitting device illuminates an object such that light measured at a position of the object satisfies specific requirements. A feature of the light-emitting device is that light emitted by the light-emitting device in a main radiant direction satisfies specific requirements.

Illumination method and light-emitting device

An object of the present invention is to provide a light-emitting device that can implement a natural, vivid, highly visible and comfortable appearance of colors and appearance of objects as if the objects are seen outdoors, and to provide a light-emitting device that can change the appearance of colors of the illuminated objects so as to satisfy the requirements for various illuminations, and a method for designing thereof. Another object of the present invention is to improve the appearance of colors of a light-emitting device which currently exists or is in use, and which includes a semiconductor light-emitting device of which appearance of colors is not very good. Moreover, another object of the present invention is to provide a method for driving the light-emitting device, an illumination method by the device, and a method for manufacturing the light-emitting device. These objects are achieved by the light-emitting device that incorporates light-emitting elements and satisfies predetermined requirements, in which &#x3d5;(&#x3bb;) emitted from the light-emitting device satisfies a predetermined condition.

An object of the present invention is to provide a light-emitting device that can implement a natural, vivid, highly visible and comfortable appearance of colors and appearance of objects as if the objects are seen outdoors, and to provide a light-emitting device that can change the appearance of colors of the illuminated objects so as to satisfy the requirements for various illuminations, and a method for designing thereof. Another object of the present invention is to improve the appearance of colors of a light-emitting device which currently exists or is in use, and which includes a semiconductor light-emitting device of which appearance of colors is not very good. Moreover, another object of the present invention is to provide a method for driving the light-emitting device, an illumination method by the device, and a method for manufacturing the light-emitting device. These objects are achieved by the light-emitting device that incorporates light-emitting elements and satisfies predetermined requirements, in which &#x3c6;(&#x3bb;) emitted from the light-emitting device satisfies a predetermined condition.

A light-emitting device that can implement a natural, vivid, highly visible and comfortable appearance of colors and appearance of objects as if the objects are seen outdoors is provided. The light-emitting device can change the appearance of colors of the illuminated objects so as to satisfy the requirements for various illuminations. Furthermore, the appearance of colors of the light-emitting device which currently exists or is in use, and which includes a semiconductor light-emitting device of which appearance of colors is not very good, is improved. A method for driving the light-emitting device, an illumination method by the device, and a method for manufacturing the light-emitting device are also provided. These features are achieved by the light-emitting device that incorporates light-emitting elements and satisfies predetermined requirements, in which &#x3c6;(&#x3bb;) emitted from the light-emitting device satisfies a predetermined condition.

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Odawara, Japan

Hideyoshi Horie