| 摘要 |
A lighting fixture is provided to achieve uniform illumination intensity distribution by determining location of a facet segment with a radial undercut. A lighting fixture(10) comprises a curved reflector(21) of a cup shape. The reflector is centered on a longitudinal axis. A light source is positioned inside the reflector. A plurality of facet segments(14a~14n) are arranged in the inner surface(30) of the reflector. A part of facet segments has the surface which is radially inward curved. A part of facet segments is formed with a undercut(HL,HM,HN) radially extended. Each facet segment has a cylinder, a spherical or a non-spherical shape. A plurality of facet segments are arranged between a free edge(R) and an apex(S) of the reflector. |
