Patent number 8616717 is assigned to
The following quote was obtained by the news editors from the background information supplied by the inventors: "The present disclosure relates to an illuminating apparatus with reduced glare.
"A Light emitting device (LED) is a semiconductor device that produces light of various colors by forming a light emitting source through a P-N junction of compound semiconductors. Recently, a blue LED and an ultraviolet LED formed using a nitride exhibiting superior physical and chemical characteristics have been introduced. Also, as a white light or other monochromatic light is created using a blue or ultraviolet LED and a fluorescent material, an application range of a LED increases.
"The LED has long life span, may be made compact and light, and may be driven at a low voltage due to its strong directivity of light. Also, the LED is strong against shocks and vibrations, does not need preheat time and complicated driving process, and may be packaged in a variety of forms, and thus, the LED may be used for many purposes.
"The LED is widely used as a general light source for illumination and an interest in comfort of illumination has increased. Factors affecting the comfort of illumination may include an illumination method, a type of a light source, intensity of illumination, brightness of a light source, and peripheral. The comfort of illumination is evaluated by a process of checking existence of glare based on the factors. Although it is difficult to quantify an amount of discomfort glare of various illuminating systems sensed by a human being, there are continuously been a demand to quantify discomfort glare to be used as a ground for objective determination. Recently, a unified glare rating (UGR) system suggested by the
In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventor's summary information for this patent: "Provided is an illuminating apparatus using an LED package that provides illumination with reduced glare.
"Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments.
"According to an aspect of the present disclosure, an illuminating apparatus includes a light source unit including a plurality of LED packages, a first prism plate arranged on the plurality of LED packages and having a prism pattern formed thereon, and a second prism plate provided on the first prism plate, and arranged such that a lengthwise direction of a prism pattern formed on the second prism plate crosses a lengthwise direction of the prism pattern of the first prism plate, wherein a triangular shape in a cross-section of the prism pattern of each of the first and second prism plates is an isosceles triangle, and a height H and a bottom side length L of the isosceles triangle satisfy the following conditions that 0.1L.ltoreq.H.ltoreq.0.2L.
"The bottom side L may be equal to or less than 0.5 mm.
"The light source unit may include a wiring substrate on which the plurality of LED packages are mounted, and a cover member that covers the wiring substrate and has a reflection surface reflecting light output from the plurality of LED packages in a direction toward the first prism plate.
"At least one of the first and second prism plates may be formed of a light transmitting material containing a diffusion agent.
"Both of UGR values according to two viewing directions that are perpendicular to each other may be equal to or less than 19. A directivity angle may be equal to or greater than 100.degree..
"According to another aspect of the present disclosure, an illuminating apparatus includes a light source unit comprising a plurality of LED packages, an optical member arranged on the light source unit and changing distribution of light emitted from the light source unit, wherein a luminous intensity distribution curve of illumination light passing through the optical member is formed within a range of about -70.degree. to about 70.degree..
"The optical member includes a first prism plate, and a second prism plate provided on the first prism plate, and arranged such that a lengthwise direction of a prism pattern formed on the second prism plate crosses a lengthwise direction of the prism pattern of the first prism plate.
"A directivity angle may be equal to or greater than 100.degree.. Both of UGR values according to two viewing directions that are perpendicular to each other may be equal to or less than 19."
URL and more information on this patent, see: Yun, Hyeong-won. Illuminating Apparatus with Reduced Glare. U.S. Patent Number 8616717, filed
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