JPH0432101A - Lighting device - Google Patents

Abstract

PURPOSE:To reduce dazzling feeling of elder people due to the light from a lighting device, and to give high illuminance by specifying the luminous intensity of the lighting device right downward, and the brightness in a peripheral direction. CONSTITUTION:Four general illuminations 1 are arranged in a square, while a partial illumination 2 is arranged in the center of the four general illuminations. The luminous intensity of the partial illumination 2 from a lighting apparatus to the right downward is increased by irradiating the direction in a concentrated manner. A louver 4 is provided for the general illumination in such a way that a light source 3 and a translucent opening on the lower surface of the light source are covered with the louver, and the light oriented from the light source part 3 to right downward is diffused thereby, and dazzling feeling is thus eliminated. A light inducing plate 5 made of transparent acrylic resin is mounted on the side surface of the light source 3. The average of the luminous intensity to the direction where a vertical angle theta=0-10 degrees, when the right downward of the lighting apparatus is 0 degree, is defined as 4,000cd, while the brightness of the lighting apparatus in the direction where a vertical angle theta=50-70 degrees is defined as 1,200-1,400cd/cm<2>.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a lighting device, and in particular to a lighting device used for general indoor lighting for elderly people, but also to conventional technology in general. The luminous intensity of the lighting equipment used in the direction of vertical angle θ = 0 degrees is approximately 400 cd, and the luminance of the lighting equipment in the direction of vertical angle θ = 50 to 70 degrees is approximately 600 cd.
0 to 7,000 cd/m" Problems that the invention aims to solve Even though the lighting characteristics of such lighting equipment are based on the visual characteristics of young people around 20 years old, it is difficult to use conventional lighting equipment for elderly people. When used, the following problems occur: (9) Elderly people have lower eyesight than younger people, so they need higher illuminance than younger people in order to be able to read the letters used in newspapers, etc. Traditional lighting equipment cannot provide sufficient illuminance for elderly people.In addition, elderly people are more susceptible to glare than younger people, so the brightness of lighting equipment must be lowered. When elderly people use conventional lighting equipment, they feel the light from the lighting equipment is dazzling.The present invention solves the above problems.Lighting device that provides necessary illuminance and prevents glare for elderly people. The lighting device ζ turtle of the present invention is such that among the luminous intensity on a vertical plane passing through the center of the lighting device, the vertical angle θ with the direction directly below the lighting device being 0 degrees is The average value of luminous intensity in the direction of θ = 0 to 10 degrees is 4
000 cd and the luminance of the lighting equipment in the direction of vertical angle θ = 50 to 70 degrees is 2000 cd/m" or less. It is well known that elderly people have lower visual acuity than younger people, so they need higher illuminance than younger people in order to be able to read the letters used in newspapers. In response, the inventors created a lighting environment in which various illuminance levels and irradiation ranges could be changed arbitrarily, and conducted visual tests.The results showed that elderly people could perceive letters similar to those used in newspapers. It became clear that about 1000 lx is required to read the newspaper easily, and that the irradiation range should be within a radius of 0.5 m that covers the spread newspaper. - Lighting equipment was installed on the ceiling of a residential building. In this case, the distance from the lighting equipment to the surface on which you read newspapers, etc. directly below the lighting equipment is approximately 2 meters. 4000 cd is required for each direction.Next, regarding glare, I conducted the following visual experiment.The glare caused by light from lighting equipment can be measured by standing or sitting at the doorway when entering a room and looking at the ceiling of the room. The sensation of glare is most felt when looking directly at the installed lighting equipment.Although the sensation of glare varies depending on the adaptation brightness of the eyes of the observer looking at the lighting equipment, in visual experiments it corresponds to the lower level of adaptation in the actual room. Adaptive brightness is 10cd
The maximum brightness of lighting equipment that can tolerate glare under the condition of 100 ft/m" was determined for each age group. The results are shown in Figure 1. The maximum allowable brightness of lighting equipment is 2000 cd/m
``It was found that the luminance of the lighting equipment is below 2000 cd/m when you enter the room and look directly at the lighting equipment installed on the ceiling of the room while standing or sitting in the doorway.'' The brightness of a lighting fixture when standing or sitting in a doorway and looking directly at a lighting fixture installed on the ceiling of a room is 1. Vertical angle θ=50~7
FIG. 2 is an external view of a lighting device for elderly people according to the present invention, in which four general lighting units 1 are arranged on a square as shown in FIG. By placing the partial lighting section 2 in the center of the four general lighting sections mentioned above, the partial lighting section 2 can increase the luminous intensity in that direction by concentrating the irradiation directly below the lighting equipment.General In the lighting section, a louver 4 is installed to cover the light source section 3 and the light-transmitting opening on its lower surface.This diffuses the light directed downward from the light source section 3 and prevents the feeling of glare.The side surface of the light source section 3 A light guide plate 5 made of transparent acrylic resin is attached to the plate 4. The light guide plate 5 is made of transparent acrylic resin with a diameter as shown in FIG. It has a diffusion part formed in white by silk printing in a striped pattern parallel to the light source part 3 whose width increases. Even though it is formed of an inclined surface that becomes thinner as it goes away, the light that enters the light guide plate 5 mainly from the side direction of the light source part 3 (the blade pattern that is repeatedly totally reflected inside the light guide plate 5 and guided to the side edge) During that time, the light that enters the diffuser part causes diffuse reflection, and most of the light exits from the light guide plate 5 and irradiates the downward direction. Since the light guide plate 5 is formed to have a substantially uniform brightness, the brightness of the lighting equipment can be lowered and glare can be prevented.
A 50 Watt halogen bulb is used for the partial lighting section 2.The average value of luminous intensity in the direction where the vertical angle θ is θ = 0 to 10 degrees, with the direction directly below the lighting fixture being 0 degrees. is 4000cd, and vertical angle θ=50~7
The luminance of the lighting equipment in the 0 degree direction is 1200-1400
Effects of the invention: cd/m'' According to the present invention, it is possible to reduce glare caused by light from lighting equipment and provide high illuminance to elderly people.

[Brief explanation of the drawing]

Figure 1 shows the relationship between age and brightness of a lighting device that can tolerate glare. This is a configuration diagram showing the relationship between the light source section and the light guide plate shown in the figure.
・Loupe 5・・Light guiding maple

Claims (1)

[Claims] Of the luminous intensity on the vertical plane passing through the center of the lighting fixture, the average value of the luminous intensity in the direction of vertical angle θ = 0 to 10 degrees with the direction directly below the lighting fixture as 0 degrees is 4000 cd, and the vertical angle θ
= 2000 brightness of lighting equipment in 50 to 70 degree direction
Lighting equipment with cd/m^2 or less