Patent EP0545474A1 successfully refreshed from Google Patents.
EP0545474A1
Expired / Lapsed
EP
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Lighting appliance, particularly for environments without natural light
Assignee: Iguzzini Illuminazione SRL
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Filing: 1992-11-26
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Granted: —
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Expires: 2012-11-26
Abstract
Abstract To allow environments to be lit with light having characteristics as close as possible to natural light, the appliance (1) comprises a frame (2) supporting pluralities of light sources (5, 6) the light from which is reflected to the outside of the appliance (1) by a reflecting screen (4) via a translucent screen (3). The light sources (5, 6) are of different colour temperatures in terms of illumination and are electrically powerable separately via a central control unit (24) in a such a manner as to enable them to provide a luminous flux of variable intensity.
Inventors
- 👤 Piera Scuri
- 👤 Douglas Skene
- 👤 Daniele Bedini
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 01:52
CPC Classifications
F; F21; F21S; F21S2/00; F21V; F21V9/00; F21V9/02; F21Y; F21Y2103/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
133 words
A lighting appliance (1) in particular for environments without natural light, characterised by comprising the following elements in combination: - a frame (2) totally surrounding a translucent screen (3); - a reflecting screen (4) side by side with said frame (2) and said translucent screen (3); - light sources (5, 6) positioned between said frame (2) and said reflecting screen (4) along the entire extension of said frame (2) so that the emitted light beams are mixedly reflected by the reflecting screen (4) and conveyed to the outside of the appliance (1) through the translucent screen (3), said light sources (5, 6) being of different colour temperatures in terms of illumination and being electrically powerable separately in a such a manner as to enable them to provide a luminous flux of variable intensity.
Claim 2
Dependent Claim
37 words
An appliance as claimed in claim 1, characterised in that said light sources (5, 6) are powered separately via a central control unit which varies their electrical quantities on the basis of the hour of the day.
Claim 3
Dependent Claim
31 words
An appliance as claimed in claim 1, characterised in that the frame (2) is rectangular in plan, the translucent screen (3) being concave with opposite concavity to the reflecting screen (4).
Claim 4
Dependent Claim
64 words
An appliance as claimed in claim 3, characterised in that the translucent screen (3) is formed from a plurality of screen elements of rectangular plan, the minor sides of which are supported by the frame (2) parallel to its major sides, and the major sides of which are supported by bars (23) of T cross-section parallel to the minor sides of the frame (2).
Claim 5
Dependent Claim
19 words
An appliance as claimed in claim 4, characterised in that the translucent screen (3) is constructed of acrylic material.
Claim 6
Dependent Claim
21 words
An appliance as claimed in claim 1, characterised in that the light sources comprise fluorescent lamps (5) and halogen lamps (6).
Claim 7
Dependent Claim
64 words
An appliance as claimed in claim 6, characterised in that the fluorescent lamps (5) are arranged in several rows with their major axis parallel to the sides of the frame (2) and have a colour temperature variable between 2700 and 6000°K, the halogen lamps (6) being arranged parallel thereto in the most outer row and having a colour temperature of up to about 2600°K.
Claim 8
Dependent Claim
67 words
An appliance as claimed in claim 1, characterised in that the reflecting screen (4) comprises for each side of the frame (2) a laminar element of parabolic cross-section with the axes through its foci (16, 20) substantially parallel to the axes along which the light sources (5, 6) lie, these latter being supported in planes (9, 10) incident with the plane in which the frame (2) lies.
Claim 9
Dependent Claim
38 words
An appliance as claimed in claim 8, characterised in that the angle (α) between the planes (9, 10) in which the light sources (5, 6) are supported and the plane in which the frame lies is indicatively 25°.
Claim 10
Dependent Claim
24 words
An appliance as claimed in claim 8, characterised in that the reflecting screen (4) is of the semi-diffusing type, ie has a semi-opaque surface.
Claim 11
Dependent Claim
17 words
An appliance as claimed in claim 10, characterised in that the semi-diffusing surface is white in colour.
Claim 12
Dependent Claim
23 words
An appliance as claimed in claim 3, characterised in that the length and width of the frame (2) are multiples of 60 cm.
Claim 13
Dependent Claim
22 words
An appliance as claimed in claim 1, characterised in that the frame (2) comprises gaskets (31) along the tubular elements (7, 8).
References Cited (Backward Citations)
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