Matsushita Electric Industrial Co., Ltd.

Kenjiro Hashimoto

Tadashi Yano

Makoto Inohara

Masanori Shimizu

Yoshinori Tanabe

Kazuaki Ohkubo

Takeshi Arakawa

Yoko Shimomura

Yukio Akashi

Syouetsu Sakamoto

In an illumination control method of the present invention, illumination of an appreciation space is controlled in association with an image displayed on an image display device so that a realism of the image displayed on a screen of the image display device can be enhanced, where an appreciator appreciating the image is in the appreciation space. More specifically, one or more light sources provided in the appreciation space is controlled so that at least one parameter of a level, a light color, a luminous intensity distribution, and a direction of illumination to the appreciation space is made substantially coincident with a corresponding parameter of a virtual image space imaginarily created from the image displayed on the image display device.

Illumination control method and illumination device

A fluorescent lamp of the present invention includes: a first electrode section having a first filament; a second electrode section having a second filament; a fluorescent tube in which a fluorescent substance Is applied on an inner wall of the fluorescent tube; a first structure of a nonconductor provided in the fluorescent tube: and a second structure of a conductor provided in the fluorescent tube. The first structure and the second structure are provided between the first filament and the second filament.

Lamp having conductor structure and non-conductor structure provided between filaments

A fluorescent lamp which produces primary light using a green emission phosphor with a peak emission wavelength at 530 nm to 560 nm and a red emission phosphor with a peak emission wavelength at 600 nm to 630 nm, is characterized in that, under illumination by said fluorescent lamp, four test colors for special color rendering index calculation, No. 9, No. 10, No. 11, and No. 12, specified in the Commission Internationale de l'Eclairage CIE Publication No. 13.3, are perceivable as red, yellow, green, and purplish blue, respectively, in terms of Munsell hues.

High efficiency fluorescent lamp with low color rendering property

A warm white fluorescent lamp wherein the visual clarity index of said lamp is in a range from 121 to 145 inclusive, the correlated color temperature of its light color is in a range from 2700 K to 3150 K inclusive, and the chromaticity point of said light color is located within a chromaticity range where distance of chromaticity point from the Planckian locus on the CIE 1960 uv chromaticity diagram is not less than -0.005 and not greater than +0.005.

Warm white fluorescent lamp

A general-purpose discharge lamp of the present invention has a reciprocal correlated color temperature Mr and an index for feeling of contrast M, wherein the index for feeling of contrast M and the reciprocal correlated color temperature Mr satisfy the relationships:

General-purpose discharge lamp and general-purpose lighting apparatus

A discharge lamp and an illumination instrument for general illumination which is able to reproduce a preferable skin color of Japanese women by an illumination light, in relation to the skin test color of Japanese women, which is important for general illumination, and is characterized in that, when the color point of the skin test color No. 15 for calculating the color rendering index according to JIS Z 8726-1990 under the light of the discharge lamp is converted to the color point under the standard illuminant CIE D65 using the CIE chromatic adaptation equation, the color point is in the elliptical region of which the major axis is 0.0068, the minor axis is 0.0037 and the inclination from the u' axis is 40.degree., centering around (u',v')=(0.2425, 0.4895) on the CIE 1976 u'v' chromaticity diagram.

Discharge lamp and illumination instrument for general illumination

Provided is an illumination device in which natural light having a correlated color temperature equivalent to that of artificial light can be obtained so that there is no feeling of physical disorder against the artificial light when the natural light is used in combination with the artificial light for energy saving. In the illumination device, luminous flux of natural light in a visible light range (380 nm-780 nm) is detected by a color temperature sensor in a first light detector portion (8), the correlated color temperature of the natural light is obtained through operation by a first operation portion (9), artificial light is detected by a color temperature sensor in a second light detector portion (10), the correlated color temperature of the artificial light is obtained through operation by a second operation portion (11), and color temperature converting filters are switched by a filter operating portion (14) so that a difference between the correlated color temperature of the natural light and the correlated color temperature of the artificial light obtained through operation by a third operation portion is made equal to or smaller than 5.5 mired to thereby obtain mixed light giving no feeling of physical disorder.

Growing community of inventors

Osaka, Japan

Kenjiro Hashimoto