Title:
照明器具
Document Type and Number:
Japanese Patent JP4080543
Kind Code:
B2
Abstract:
The luminaire has a concave reflector (1) with an optical axis (3) in a plane of symmetry (2), suitable to receive an elongate light source transverse to said plane (2). The reflector (1) is composed of flat facets (10,10') which are bounded by first parallel planes (8) which are transverse to the plane of symmetry (2), and which facets (10,10') are arranged in rows (11,11') by second planes (9) which are parallel to the plane of symmetry (2). The first planes (8) are at an acute angle to a light emission window (5). The reflector (1) touches the window (5) at one side of the axis (3) and is extended by a light reflecting screen (7) up to said window (5) at the opposite side of the axis (3). The luminaire can be used to illuminate sports fields, the light emission window (5) being directed downwards, has a sharp cut-off angle and prevents stray light above the horizontal.
Inventors:
Wavenga Hendrick
Entrop Jean Jean
Entrop Jean Jean
Application Number:
JP52930498A
Publication Date:
April 23, 2008
Filing Date:
March 05, 1998
Export Citation:
Assignee:
Koninklijke Philips Electronics N.V.
International Classes:
F21V7/00; F21V7/06; F21S8/00; F21S10/00; F21V7/09
Domestic Patent References:
| JP7153302A |
Foreign References:
| US4293901 | ||||
| US4789923 |
Attorney, Agent or Firm:
Susumu Tsugaru