JPS5812206A - Bottom open type lighting apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a fluorescent lamp that emits light with a low color temperature in the downward direction of the lamp and emits light with a high color temperature in the upward direction of the lamp;
By lighting the lamp in combination with a white reflector that reflects downward the light with a high color temperature emitted upward from the lamp, the whiteness, cleanliness, and gentleness of the reflector are emphasized.

Moreover, the present invention relates to an open-bottom lighting fixture characterized by obtaining light with a low color temperature as illumination light.

Fluorescent lamps conventionally used in open-bottom appliances for general illumination are those in which the entire inner cylindrical portion of the fluorescent tube is coated with a homogeneous phosphor layer. A lamp with a low color temperature, such as a warm white fluorescent lamp, is used as this lamp, and when this lamp is turned on, the white fixture reflector will be illuminated with light with a low color temperature, making the fixture reflector look yellowed and old-fashioned. There were some noticeable flaws. An example of a facility where fluorescent lamps with a low color temperature are often used is a store space. One of the reasons for using fluorescent lamps with a low color temperature in such spaces is to use artificial lighting to recreate the feeling of being illuminated by warm sunlight rather than a clear blue sky. In such facilities, when fluorescent lamps are lit using open-bottom fixtures with white reflectors, the fixture reflectors have the role of properly reflecting the light emitted from the lamps downwards and Its role is to create a ceiling surface as a background surface. When a lamp with a low color temperature, in which the entire inner cylindrical part of the fluorescent tube is coated with the same type of phosphor, is used as this pump,
The instrument reflector has a yellowish tint, which is far removed from the impression of a clear blue sky produced by the surface of the reflector.

The present invention provides a lighting fixture that can solve this problem.

The present invention will be explained below based on the drawings showing one embodiment.

In the figure, an open-bottom device 2 having a white-painted reflector 1 has a phosphor layer coated with a phosphor having a property of emitting light with a color temperature of 6500 on the inner upper half-cylinder of the phosphor tube. 3, and a phosphor layer 4 in which a phosphor having a property of emitting light with a color temperature of 2500 is coated on the remaining inner lower half cylinder of the fluorescent tube. It mainly consists of

The fixture reflection &1 is mainly illuminated with high color temperature light emitted from the phosphor layer 3, producing the effect of emphasizing the whiteness of the reflector. On the other hand, the light emitted downward from the device 2 is transmitted through the phosphor layer 3.
This is a mixture of light emitted from the phosphor layer 4, reflected by the reflector 1, and light radiated directly downward from the phosphor layer 4. Here, the ratio of the amount of light reflected by the white reflector (luminous flux) from the inner upper half cylinder of the fluorescent lamp to the amount of light emitted directly from the inner lower half cylinder (luminous flux) is 1. :2, 1:3, the color temperature of the illumination light emitted from the lighting fixture is approximately 3200K and approximately 3000K, respectively. therefore,
A warm white illumination light is obtained on the illuminated visual work surface.The color temperature of the illumination light can be changed by changing the color temperature of the upper and lower halves of the fluorescent lamp. It can also be realized by changing the area ratio of the fluorescent film formed on the inner surface of the bulb.Furthermore, it can be realized by changing the geometrical structure and reflection characteristics of the white reflector.

As described above in detail, by using the lighting equipment of the present invention, it is possible to increase the whiteness of the equipment reflector, emphasize the cleanliness and suppleness of the reflector, and provide warm illumination light with a low color temperature. The color of the light gives a calming feeling. Therefore, by applying the lighting equipment of the present invention to the field of lighting such as stores, it is possible to create a space with high visual effects.

[Brief explanation of the drawing]

The figure shows the configuration of a two-lamp lighting fixture as an embodiment of the present invention. 1...White reflective plate, 2...Bottom open type device main body, 3...phosphor layer (coated with a phosphor that emits light with a high color temperature) film), 4...phosphor layer (film coated with a phosphor that emits light with a low color temperature),
5...Fluorescent lamp.

Claims (1)

[Claims] A fluorescent lamp having a property that the color temperature of the light emitted from the inner upper semi-cylindrical part of the glass pulp is higher than the color temperature of the light emitted from the inner lower semi-cylindrical part, and the light emitted from the upper semi-cylindrical part. An open-bottom lighting fixture equipped with a white reflector that reflects light downward.