Circuit board and light emitting device including circuit board
地域：
Kyoto
摘要
A circuit board according to the present disclosure includes a substrate, a conductor layer arranged on the substrate, a reflective layer arranged on the conductor layer, and a silicone-resin layer arranged on the substrate. The silicone-resin layer is in contact with the conductor layer and the reflective layer. The silicone-resin layer contains equal to or more than 45% by mass of a plurality of fillers. A first filler whose aspect ratio is larger than 5 occupies equal to or more than 5% of 100% of a total number of the fillers.
說明書
As illustrated in Table 5, reflectance of samples No. 26 to 28 was equal to or more than 97.3%, and was higher than that of samples No. 25 and 29. From there results, it was found that a circuit board had a further higher reflectance when an average value of a circle equivalent diameter of the third filler was equal to or more than 0.3 μm to equal to or less than 2 μm.
Next, samples were fabricated whose height relation between surfaces of a silicone-resin layer and a reflective layer was different from one another to execute measurement of their reflectance.
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