To provide a lighting system capable of alleviating optical loss and restraining degradation of light distribution characteristics and equipped with a plurality of lenses coupled for irradiating light incident from light-emitting elements.
The system is provided with a plurality of bulk-type lens bodies 31 each equipped with an incident face 311, an irradiating face 313 having a ring-shaped lead-out lens 303 formed along an outer edge part, and an outer periphery part 312 connecting the incident face 311 and the irradiating face 313, and a coupling part 32 for coupling the plurality of lens main bodies 31 with a first main face 321 in contact with the outer periphery part 312 at a first contact point 401 under an outer end part of the lead-out lens 303 and with a second main face 322 in contact with the outer periphery part 312 at a second contact point 402 further below the first contact point 401. The first contact point 401 is to be at a more outside along the first main face 321 than a crossing point P where an extended part Lp of a light beam of the irradiation light incident from the incident face 311 and irradiated on the second contact face 402 crosses an extended part of the first main face 321, as seen from the center of the lens body 31.
Iwa Saki Kokuni
Masakazu Ito
Shunichi Takahashi
Toshio Takamatsu