US 7,744,248 B2 · Lighting fixture

Abstract

A compact lighting fixture having various functions can be achieved at low cost. The lighting fixture can provide a high degree of freedom for space utilization, can provide a comfortable illumination space with designed light distribution, can be configured to require a smaller space for installation, and can have an appearance that is not so different from its surroundings. As a component constituting the illumination optical system, a polygonal frustum portion can be located at a center and can have tapered side reflecting portions. When assuming that three concentric imaginary circles have respective radii of R1, R2 and R3 (R1<R2<R3) and a center positioned at a center axis of the frustum portion, individual lens portions can be located at respective intersections where the imaginary circle having the radius of R1 and lines extending radially from the center at regular center angles of α intersect. Light-incident lenses can be located at respective intersections where the imaginary circle having the radius of R2 and bisectors of the center angles of α intersect. LEDs can be located at respective intersections where the imaginary circle having the radius of R3 and lines connecting the center and positions of the light-incident lenses intersect.

Claims19

Dependent claims

A lighting fixture comprising:

a light transmitting portion;
a reflecting portion facing towards the light transmitting portion and substantially in parallel with the light transmitting portion;
a frustum portion having a top surface arranged adjacent the light transmitting portion, a center axis being perpendicular to a surface of the light transmitting portion, and at least one continuous slanting reflection surface forming a side surface of the frustrum portion;
and
a plurality of individual lens portions, a plurality of light-incident lenses and a plurality of LEDs, which are arranged inside an area defined by the light transmitting portion, the reflecting portion, and the frustum portion, wherein
the individual lens portions are located closest to the center axis of the frustum portion, the light-incident lenses are located further from the center axis of the frustum portion relative to the individual lens portions, and the LEDs are located furthest from the center axis of the frustum portion relative to the individual lens portions and the light incident lenses.

3 more elements

A lighting fixture having a light emitting direction along an optical axis of the lighting fixture, comprising:

a light transmitting portion having an emission surface facing in the light emitting direction of the lighting fixture, the light transmitting portion including an outer-most peripheral edge located about the optical axis of the lighting fixture;
a reflecting portion facing towards the light transmitting portion and substantially in parallel with the light transmitting portion;
a frustum portion having a center axis extending in the light emitting direction of the lighting fixture and substantially perpendicular to the emission surface of the light transmitting portion, the frustrum portion having at least one angled reflection surface forming a side surface of the frustrum portion at an acute angle with respect to the center axis;
a plurality of lens portions located within the outer-most peripheral edge of the light transmitting portion when viewed from the light emitting direction and along the optical axis of the lighting fixture;
a plurality of light-incident lenses located within the outer-most peripheral edge of the light transmitting portion when viewed from the light emitting direction and along the optical axis of the lighting fixture;
and
a plurality of LEDs located adjacent the light transmitting portion, wherein
the individual lens portions are located closest to the center axis of the frustum portion, the light-incident lenses are located further from the center axis of the frustum portion relative to the individual lens portions, and the LEDs are located furthest from the center axis of the frustum portion relative to the individual lens portions and the light incident lenses.

5 more elements

Dependencies are inferred from the claim text.

Lighting fixture

Life of this patent

Lighting fixture

Life of this patent

Abstract

Claims19