Ccs Corporation

Takashi Osawa

Takahiko Koyama

To provide a highly reliable lighting-emitting device that hardly causes defects in case a wiring board is bent, while realizing high brightness by increasing a mounting density of surface-mounted LEDs on a wiring board that is rounded into a truncated cone shape or a cylinder shape, the light-emitting device comprises: the wiring board, a plurality of sets of pads arranged in a line along a circumferential direction of the wiring board, and a plurality of surface-mounted LEDs respectively fixed to the pads. The device satisfies y&#x2264;&#x2212;1.04x+1.80, where (L) is a length of the circumference of the wiring board with the pads, (y) (y=s/L) is a ratio of a total sum (s) of the lengths in the circumferential direction of the pads relative to the circumferential length (L), and (x) is a curvature of the wiring board where the pads are arranged.

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Kyoto, Japan

Takashi Osawa