PLANAR LIGHT-EMITTING DEVICE AND SHEET SWITCH MODULE, AND KEY SWITCH MODULE

摘要

PROBLEM TO BE SOLVED: To provide a planar light-emitting device by which loss of light is suppressed, and that is favorable for light extraction.

SOLUTION: A planar light-emitting device 1 includes: a sheet-like light guiding body 3 for guiding light from a light source 2 to the surface direction; a low refractive index layer 4 formed on a lower surface 3a of the light guiding body 3; and an adhesive layer 5 formed on a lower surface 4a of the low refractive index layer 4. The low refractive index layer 4 is made up of a plurality of belt-like portions 7 formed at intervals in the X direction to which the light is guided.

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