To provide a natural lighting device in which reduction in the natural lighting efficiency for the sunlight is suppressed to the minimum and a light stabilized in emitting direction can be obtained.
This device 10 is constituted by providing a natural lighting port 43 for taking sunlight L, a dome cover 12 provided at this natural lighting port 43, a light guiding path 44 or guiding the sunlight L into a room by surrounding it with a light guiding wall 45 forming a wall surface 45a as a light reflecting plane, emission port 47 for irradiating the inside of the room with the sunlight L, and a transmission diffusion plate 48 provided at this emission port 47. In this case, a prism for enlarging an apex angle gradually from the top to the peripheral edge part is formed on the dome cover 12, and the advancing direction of sunlight 1 taken by the dome cover 12 is curved wide gradually from the top to the peripheral edge part in the lengthwise direction of the light guiding path 44.
FUJIMOTO YOSHIOKI
MATSUE JUNJI
OKONOGI AKIRA
KATO SHOZO
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