| 摘要 |
PURPOSE: A light bulb using an LED light source is provided to increase the quantity of light without an additional spectrum lens or reflector by arranging an LED device properly. CONSTITUTION: A light bulb(100) includes a body(10) and a pair of substrates(20). The body includes an electric connection unit(11), a DC converter(12), and a bulb cap(13). The bulb cap is made of the transparent material. The substrate is electrically connected to the DC converter of the body. A plurality of LED devices(L) are mounted on the substrate. A linear combination groove is formed on the substrate from the edge to the center. A pair of substrates are combined in a cross shape to form a first light irradiation part(30) and a second light irradiation part(40).
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