Patent ID: 9293662
Filing Date: 2016-03-22
CPC Classification: F21K,F21V,F21Y,H01L

Claim Text:
1. A light emitting device comprising: a chip-on-board type package substrate on which a plurality of light emitting diode (LED) elements are directly mounted; a circuit pattern formed on the package substrate, the circuit pattern including: a plurality of mounting parts, on which the plurality of LED elements are electrically connected; a plurality of series of connecting parts to arrange the plurality of LED elements in series connection; a parallel connecting part to connect both ends of each series connecting parts with a pair of an anode electrode and a cathode electrode which supply current to the plurality of LED elements, wherein each LED element electrically connected to the circuit pattern includes plural kinds of LED elements which are different from one another in light emission wavelength and in temperature characteristics, wherein by using the temperature characteristics of the plural kinds of LED elements, an average color rendering index (Ra) as a whole device is configured to become within a range of 95 to 98 at an operating temperature of 80° C. than the Ra in a range of 78 to 82 at an ordinary temperature of 20° C., wherein a ratio of light emission intensity in a peak wavelength of a blue LED element and of a red LED element of the plural kinds of LED elements is in a range from 1:4 to 1:6 at an ordinary temperature and is in a range from 1:2.5 to 1:3.5 at an operating temperature, and wherein the plural kinds of LED elements include the blue LED element, a green LED element and the red LED element.