Abstract: Disclosed is an illuminating unit capable of effectively introducing light emitted from a light source into a light guide sheet to improve the brightness of light and emitting uniform color light. Light emitted from a light emitting diode of a light source unit is incident on a side surface of a light guide sheet. A spacer aligns the emission center of the light emitting diode with the center of the light guide sheet in the thickness direction thereof. The incident light travels in the light guide sheet and is then diffused in light emitting regions provided on the main surface of the light guide sheet. Then, the diffused light is emitted to the outside. In addition, light components emitted from a gap between the light emitting diode and the side surface of the light guide sheet or light components emitted from the upper surface of the light source unit to the outside are reflected to the light guide sheet by a cover member.

Abstract: A printed circuit board comprises an insulating substrate, a plurality of wiring members disposed on the insulating substrate, and a coating member that covers the wiring members and the insulating substrate between the wiring members. The wiring members include Ag, and the coating member is formed of an acrylic glass and a curing agent comprising hexamethylene diisocyanate.