JPH04255609A - Lighting fixture - Google Patents

Abstract

PURPOSE:To obtain a lighting fixture having the capability of providing high illuminance at the top of a desk, and warm and comfortable illumination light at other area than the desk top and the peripheral area thereof, and reducing the glare of light by changing the correlated color temperature of a light source. CONSTITUTION:A fluorescent lamp 1 having correlated color temperature equal to or above 2800 K, illuminates the top of a desk immediately below as a main illumination direction, and directions other than the aforesaid main illumination direction is interrupted with a color temperature change filter 3 to change the correlated color temperature of a light source in the fluorescent lamp 1 to a level above or below 2800 K, thereby reducing the glare of light when viewed in a direction toward a lighting fixture enclosure 2, or reducing the glare of light emitted in other directions than the main illumination direction.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device, and more particularly to a lighting device that obtains high illuminance on a desk surface and reduces glare around the desk surface.

0002

[Background Art] In recent years, with the progress of an aging society, it has become necessary to consider the visual environment in the home, which is the main place of elderly people's lives, so that they can lead comfortable and enriching lives. Ta.

Conventionally, lighting devices for setting the visual environment have been designed by evaluating efficiency, color rendering, light color, etc., based on the visual characteristics and color vision characteristics of young people. However, as visual and color vision characteristics change with age, current lamp designs are not necessarily suitable for elderly people in terms of safety and visual workability.

0004

[Problems to be Solved by the Invention] In particular, elderly people tend to suffer from cataracts to some extent, and therefore have the characteristic that light entering the eyes is more likely to be scattered. As a result, people experience strong glare and discomfort from high-intensity lighting, and the light creates a light curtain inside the eyeballs, making it difficult to see. On the other hand, visual acuity deteriorates with age, and desk surface illuminance must be high to maintain visual workability. in this way,
There is an increasing demand for lighting equipment that reduces glare and provides high illuminance. However, there is currently no lighting equipment that takes into account the visual characteristics of elderly people and reduces glare. Therefore, it has not been possible to create a safe and comfortable visual environment for the elderly.

[0005] The present invention solves the above-mentioned conventional problems, and provides a lighting fixture that achieves high illuminance on a desk surface and reduces glare when looking at the lighting fixture. With the goal.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a light source with a correlated color temperature of 2800 K or more;
Cover areas other than the specific main irradiation direction with a color temperature conversion filter that converts the light emitted by the light source to a correlated color temperature of 2800 K or higher, or convert the light emitted by a light source with a correlated color temperature of 2800 K or higher to a correlated color temperature of 2800 K or higher. It is configured to include a reflector having a spectral reflectance necessary for conversion to color temperature.

[0007]

[Operation] With the above configuration, the present invention provides sufficient illuminance with a high color temperature in the main irradiation direction, that is, on a desk surface, etc., and when looking toward the lighting equipment or the surrounding area, the light irradiated is dazzling. This provides a lighting environment suitable for the light color of domestic lighting, which is a human living space.

[0008]

[Example] It is known that as we age, light scattering in the eye increases, especially for light in the short wavelength range (
For example, Vos, J. J. , CIE journal
l, Vol. 3 No. 2 (1984) P39). The greater this scattering, the more likely one is to feel glare from the light, so there is a close relationship between the correlated color temperature of the light source and glare.

Illumination light with a low correlated color temperature causes less glare to humans than illumination light with a high correlated color temperature. On the other hand, correlated color temperatures with a correlated color temperature of less than 2800 K are too orange, so even though it is indoor lighting, the light color becomes very similar to sunsets or tunnel lighting such as low-pressure sodium lamps. Therefore, it is not suitable for indoor lighting. An incandescent light bulb is a typical light with a low color temperature, and its correlated color temperature is 2800K. This light color has long been popular as a light that brings peace and abundance to humans, and is very suitable as a light color to be used as lighting in homes, which are human living spaces.

[0010] Therefore, the relationship between the correlated color temperature of the light source and glare was experimentally determined. In the experiment, the binocular septum method was used as a psychological method to match the glare between the reference light and the test light having six different correlated color temperatures. The observers were 5 males and 3 females aged 22 to 61 years old with normal color vision.

FIG. 2 shows the relationship between the correlated color temperature of the light source and the degree of glare obtained through experiments. In FIG. 2, the horizontal axis is the correlated color temperature of the light source, and the vertical axis is the relative value of the degree of glare.

[0012] The degree of glare is as follows: 1. The degree of glare is 1.
0, the larger the value, the less glare, and the smaller the value, the more glare.

From (FIG. 2), it was confirmed that the lower the correlated color temperature of the illumination light source, the less perceived glare.

From (Fig. 2), it is clear that in order to produce a lighting fixture that has high illumination on the desk surface and suppresses glare to give a comfortable, warm, and relaxing feeling, it is necessary to The relative color temperature of the light illuminated around the desk top surface can be adjusted to 2800 K of an incandescent light bulb, which is standard light with a low color temperature, by manipulating the spectral reflectance of the reflector of the lighting equipment. I understand.

[0015] As described above, it is possible to reduce glare without reducing the illuminance of the desk top surface. (Embodiment 1) Hereinafter, a lighting fixture for reducing glare according to Embodiment 1 of the present invention will be described based on (FIG. 1). In FIG. 1, 1 is a fluorescent lamp, 2 is a lighting equipment housing, and 3 is a color temperature conversion filter. The fluorescent lamp 1 is
For example, if the correlated color temperature is 5000 K, the desk surface located on the vertical line, which is the main irradiation direction in this case, will maintain high illuminance and good visibility, and the illumination other than the desk surface and around the desk surface will be Light is emitted from a fluorescent lamp 1,
By passing through the color temperature conversion filter 3, the correlated color temperature is converted to within 2800 K, thereby making it possible to obtain an open-bottom lighting fixture that provides warm and comfortable illumination light with reduced glare.

[0016] Here, the correlated color temperature is defined as 2800 K or less, but if it is less than 2800 K, the light color becomes strong orange as described above and is not suitable for indoor lighting. Also, as you can see from (Figure 2), if the color temperature is too high, the glare will increase, so the temperature should be set at 2700 K or JI.
The range is set at 3150 K, which is the upper limit of the S bulb color range and where the glare in (Figure 2) is about 10% greater. (Example 2) In order to convert the correlated color temperature to a lower color temperature, there are two methods: a method using a color temperature conversion filter and a method of changing the correlated color temperature of the reflected light of the illumination light by changing the spectral reflectance characteristics of the reflector. be. Example 1 showed an example of an open-bottom lighting fixture using a color temperature conversion filter, but Example 2
An example of an open-bottom lighting fixture using a color temperature conversion reflector in which the spectral reflectance characteristics of the reflector of a pendant of the lighting fixture are changed is shown below.

To explain based on the following (FIG. 3), 1
2 is a fluorescent lamp, 2 is a lighting equipment housing, and 4 is a color temperature conversion reflector. For example, the fluorescent lamp 1 has a correlated color temperature of 5
000 K, the desk surface located on the vertical line, which is the main irradiation direction, is maintained in a state of high illumination and good visibility,
Illumination light other than the desk surface and around the desk surface is emitted from the fluorescent lamp 1, and is reflected by the color temperature conversion reflector 4 to convert the correlated color temperature to around 2800 K, thereby reducing glare. , it can be an open-bottom lighting fixture that provides comfortable illumination light.

[0018] In the above embodiments, a straight tube type fluorescent lamp is used to illuminate vertically from above, but lighting equipment using a U-shaped or light bulb type fluorescent lamp and in the form of a table lamp or the like may also be used. Of course, it can also be applied to

[0019]

Effects of the Invention As is clear from the above embodiments, according to the present invention, high illuminance can be obtained on the desk surface, providing soft and warm illumination light to areas other than the desk surface or the periphery of the desk surface, and preventing glare. Accordingly, it is possible to provide an open-bottom lighting fixture with reduced thickness.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a lighting fixture according to Embodiment 1 of the present invention.

[Figure 2]
A diagram of the relationship between the correlated color temperature of the light source and the degree of glare, which is also the basic concept of this device.

[Fig. 3] A perspective view of the lighting fixture of Example 2.

[Explanation of symbols]

1 Fluorescent lamp 2. Lighting equipment housing 3 Color temperature conversion filter 4 Color temperature conversion reflector

Claims (2)

[Claims] 1. A light source with a correlated color temperature of 2800 K or more, and a color temperature conversion filter that converts the light emitted by the light source into a correlated color temperature of around 2800 K, the color temperature conversion filter A lighting fixture configured to reduce glare by covering areas other than a specific main illumination direction. 2. A light source having a correlated color temperature of 2800 K or more, and a color temperature conversion reflector having a spectral reflectance necessary to convert the light emitted by the light source to a correlated color temperature of around 2800 K, A lighting device configured to reduce glare by reflecting light reflected from the color temperature conversion reflector in a direction other than a specific main irradiation direction.