Lighting fixture with controlled photometric light emission

• US 8,757,850 B2
• Filed: 02/16/2012
• Issued: 06/24/2014
• Est. Priority Date: 03/02/2011
• Status: Expired due to Fees

• Current Assignee: Beghelli S.P.A.
• Original Assignee: Beghelli S.P.A.
• Inventors: Beghelli, Gian Pietro
• Primary Examiner(s): CARIASO, ALAN B
• Application Number:
  US13/398,536
• Publication Number:
  US 20120224369A1
• Time in Patent Office: 859 Days
• Field of Search: 362/294, 362/335, 362/336, 362/311.02, 362/311.06, 362/311.1, 362/368, 362/373, 362/375, 362/455
• US Class Current: 362/335
• CPC Class Codes: F21S 8/02 of recess-mounted type, e.g. downlighters specially adapted for vehicle exteriors F21S41/00-F21S45/00
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

Lighting fixture (10) with controlled photometric light emission, comprising a LED light source (21), whose operation is ensured by an electronic printed circuit board (20) which is properly sized and designed, and a housing (30) for containing the LED light source (21) and the electronic printed circuit board (20), able to obtain a heat dissipation; in particular, different type of lenses (25, 26, 27) having different surface geometry can be placed over the LED light source (21), said lenses (25, 26, 27) being able to direct the light beam emitted from the LED light source (21), in order to obtain uniform illumination on surfaces having variable geometry.

Claims

1. Lighting fixture (10) having a selected light distribution pattern comprising at least one LED light source (21), whose operation is ensured by a properly sized and designed electronic printed circuit board (20), and at least one housing (30) for containing said LED light source (21) and said electronic printed circuit board (20) and able to obtain a heat dissipation, wherein a lens (25, 26, 27) is placed over said LED light source (21), said lens (25, 26, 27) being selected from the group consisting of three different lenses (25, 26, 27), each of said three different lenses having different surface geometry that achieves a desired light distribution pattern said three lenses (25, 26, 27) being able to direct the light beam emitted from said LED light source (21), in order to obtain uniform illumination on surfaces to provide an illuminated area having a fixed geometry characterized in that:

a first lens (27) is placed inside a cover body (23) made of polycarbonate, with a protective film (29) placed between said cover body (23) and said printed circuit board (20), said first lens (27) being positioned in a lighting fixture (10) fixed to a ceiling at 7 meters from the floor to generate an illuminated area on the floor with a square shape, or

a second lens (25) is placed inside a cover body (23) made of polycarbonate, with a protective film (29) placed between said cover body (23) and said printed circuit board (20), said second lens (25) being positioned in a lighting fixture (10) fixed to a ceiling at 3 meters from the floor to generate an illuminated area on the floor with a rectangular shape, or

a third lens (26) is placed inside a cover body (23) made of polycarbonate, with a protective film (29) placed between said cover body (23) and said printed circuit board (20), said third lens (26 being positioned in a lighting fixture (10) fixed to a ceiling at three meters from the floor to generate an illuminated area on the floor with a square shape.

2. Lighting fixture (10) as claimed in claim 1, characterized in that said fixture (10) is fixed at a certain height by means of a bracket (24).

3. Lighting fixture (10) as claimed in claim 1, characterized in that said first lens (27) and said third lens (26) have equal and symmetrical sections on a plane (H, K) at 0°

and on a plane at 90° and

a different section on a plane (J, L) at 45°

, said sections being able to identify on a plane a plurality of circle arcs, which form the geometrical shape of said first and third lenses (27, 26), with rays having different lengths at least every 15°

of the section plane and with offset centers.

4. Lighting fixture (10) as claimed in claim 1, characterized in that said second lens (25) has different sections on planes (M, N, P) at 0°

, at 45° and

at 90°

, said sections being able to identify on a plane a plurality of circle arcs, which form the geometrical shape of said second lens (25), with rays having different lengths at least every 15°

of the section plane and with offset centers.