WO2005124227A1 - Method used to modify the photometrics of a prismatic transparent diffuser - Google Patents

Method used to modify the photometrics of a prismatic transparent diffuser Download PDF

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Publication number
WO2005124227A1
WO2005124227A1 PCT/IT2004/000363 IT2004000363W WO2005124227A1 WO 2005124227 A1 WO2005124227 A1 WO 2005124227A1 IT 2004000363 W IT2004000363 W IT 2004000363W WO 2005124227 A1 WO2005124227 A1 WO 2005124227A1
Authority
WO
WIPO (PCT)
Prior art keywords
diffuser
paint
sphere
prisms
prismatic
Prior art date
Application number
PCT/IT2004/000363
Other languages
French (fr)
Inventor
Alberto Guzzini
Cherubino Guzzini
Original Assignee
Acrilux S.P.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Acrilux S.P.A. filed Critical Acrilux S.P.A.
Priority to PCT/IT2004/000363 priority Critical patent/WO2005124227A1/en
Publication of WO2005124227A1 publication Critical patent/WO2005124227A1/en

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G02B5/045—Prism arrays
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V3/00—Globes; Bowls; Cover glasses
    • F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/0091—Reflectors for light sources using total internal reflection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
    • F21V7/28—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0231—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having microprismatic or micropyramidal shape
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0284—Diffusing elements; Afocal elements characterized by the use used in reflection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/002—Processes for applying liquids or other fluent materials the substrate being rotated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/32—Processes for applying liquids or other fluent materials using means for protecting parts of a surface not to be coated, e.g. using stencils, resists
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • B05D5/061—Special surface effect
    • B05D5/063—Reflective effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • B05D5/067—Metallic effect
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/02—Refractors for light sources of prismatic shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/40—Lighting for industrial, commercial, recreational or military use
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/40—Lighting for industrial, commercial, recreational or military use
    • F21W2131/402—Lighting for industrial, commercial, recreational or military use for working places

Definitions

  • the present patent application refers to a method used to modify the photometries of a prismatic transparent diffuser in order to meet lighting standards or specifications. It is understood that patent protection is also extended to the diffuser produced according to the method of the invention.
  • the diffuser of the invention is a diffuser normally available on the market, of the type consisting in a polycarbonate or polymethylmethacrylate sphere with external smooth wall and internal surface characterised by the presence of a dense continuous series of longitudinal prisms, basically consisting in grooves with V-shaped cross-section, which extend from the top to the base of the sphere in alternation with corresponding grooves.
  • the presence of the internal prisms gives the diffuser refracting and reflecting properties that change according to the number, size and shape of the prisms, as well as the shape of the diffuser, which is technically defined as refractor-reflector due to the aforementioned properties.
  • the present invention refers to a method used to modify the photometries of this type of diffusers, in order to meet the following characteristics that are today universally recognised as indispensable to obtain a spatial distribution of light with a satisfactory illumination level on the work surface and at the same time excellent visual comfort in the working setting, both in commercial and industrial fields:
  • the first technique consists in applying a screen inside the diffuser, made of a sheet of aluminium or other suitable material with total absolute reflection properties. Although characterised by simplicity and low construction costs, this method does not guarantee satisfactory results. According to this technique, the luminous flow is directed downwards, with the risk of determining strong illumination contrasts that impair visual comfort for those who work in environments illuminated in this manner.
  • a more advanced and more sophisticated method that is capable to achieve the established objectives completely consists in coating the diffuser either internally or externally with a very thin screening layer of metal particles, usually aluminium particles, deposited on the surface to be treated with vacuum metallization process.
  • This known technology consists in low pressure sublimation and condensation of a metal in order to deposit a thin metal film on the surface to be treated. Low pressure permits metal molecules to achieve the condensation surface and being deposited starting from the sublimation source without encountering obstacles, such as air or other gaseous fluids.
  • the surface to be metallized must be levelled with the application of a special product, having insulating and gripping properties with respect to metal molecules.
  • a thin protection film must be applied onto the metallized surface in order to protect the thin metal film layer from oxidative degradation and mechanical abrasion, as well as from chemical aggression from perfumes, essences, etc. Apart from the good results that can be achieved, this method is impaired by complexity and difficult actuation that considerably affect final production costs of the diffuser.
  • the purpose of the present invention is to devise a new method used to modify the photometries of a prismatic transparent diffuser, characterised by low actuation costs and satisfactory results with respect to the established objectives.
  • the method of the invention consists in a painting process for the diffuser internal surface, characterised by the fact that the layer of metallized paint is used to cover only the two faces of each prism, leaving uncovered a very narrow longitudinal band on the bottom corner where the walls of each parallel pair of prisms converge.
  • This allows to increase the reflecting properties of the prismatic diffuser, which maintains its original refracting capabilities only in the very narrow unpainted band where the desired effect of semi-transparency is created.
  • This painting process is implemented by means of traditional spraying paint installations, using high-metallizing paints of the type available on the market.
  • the painting process of the invention includes the following operating stages, in case of application on a prismatic diffuser shaped as a sphere with parabolic curve: - positioning of paint spraying nozzles inside the sphere to direct the paint spray in orthogonal direction to the first of the two faces of the prisms located on the internal wall of the diffuser;
  • each painting stage changes according to the capacity of the spraying nozzles and rotation speed of the diffuser; in any case the painting stage must continue for the period of time that is necessary to cover the faces of the prisms with a paint layer of very few microns, leaving uncovered a very narrow longitudinal band, with width equal at least to two tenths of millimetre, on the bottom corner where the walls of each parallel pair of prisms converge. If paint with high resistance to weather and chemical agents, as well as high temperature is used, it will not be necessary to apply a protection film of transparent product over the layer of metallized paint.
  • the enclosed drawings which are intended for purposes of illustration only and not in a limiting sense, whereby:
  • - Fig. 1 is a perspective view of the internal surface of a prismatic diffuser shaped as a sphere with parabolic curvature.
  • - Fig. 2 is a perspective view of the external surface of a prismatic diffuser shaped as a sphere with parabolic curvature.
  • - Fig. 3 is a cross-section with a transversal plane to the prisms of a portion of diffuser obtained with the method of the invention.
  • Fig. 4 shows the photometric diagram of a prismatic diffuser obtained with the method of the invention.
  • the diffuser (1) has a smooth external surface (1a) and an internal wall (1b) with a dense longitudinal series of prisms (1c), basically consisting in grooves with V-shaped cross-section, which extend from the top to base of the sphere in alternation with corresponding grooves. Both faces of the prisms (1c) are covered with a very thin layer (2), of about 1-3 microns, of metallized paint, except for a very narrow longitudinal band (3) on the bottom corner where the walls of each parallel pair of prisms
  • Fig. 3 also shows the direction of a ray of light (A) reflected by the painted surface of the prisms (1c) and a ray of light (B) refracted by the unpainted band (3).
  • the diagram of Fig. 4 refers to a diffuser obtained with the method of the invention using an aluminium based paint, especially produced for this purpose, having the following characteristics:
  • the diffuser obtained with the method of the invention has the following characteristics:

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Manufacturing & Machinery (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

The present invention refers to a method used to modify the photometrics of a prismatic transparent diffuser (1) having an internal wall with a dense longitudinal series of prisms (1c), whose faces are painted according to the method of the invention with a thin layer (2) of highly-reflecting paint, leaving unpainted a very narrow longitudinal band on the bottom corner where the walls of each parallel pair of prisms converge. This prismatic transparent diffuser obtained by the method is also claimed.

Description

Description
Method used to modify the photometries of a prismatic transparent diffuser
The present patent application refers to a method used to modify the photometries of a prismatic transparent diffuser in order to meet lighting standards or specifications. It is understood that patent protection is also extended to the diffuser produced according to the method of the invention. The diffuser of the invention is a diffuser normally available on the market, of the type consisting in a polycarbonate or polymethylmethacrylate sphere with external smooth wall and internal surface characterised by the presence of a dense continuous series of longitudinal prisms, basically consisting in grooves with V-shaped cross-section, which extend from the top to the base of the sphere in alternation with corresponding grooves. The presence of the internal prisms gives the diffuser refracting and reflecting properties that change according to the number, size and shape of the prisms, as well as the shape of the diffuser, which is technically defined as refractor-reflector due to the aforementioned properties. The present invention refers to a method used to modify the photometries of this type of diffusers, in order to meet the following characteristics that are today universally recognised as indispensable to obtain a spatial distribution of light with a satisfactory illumination level on the work surface and at the same time excellent visual comfort in the working setting, both in commercial and industrial fields:
- low luminance levels in the visual field and consequently cut-off angles usually not lower than 30 degrees (UN1 10380);
- high vertical illumination; - indirect light able to avoid the creation of excessive illumination contrasts characterised by evident demarcation lines between illuminated areas and shaded areas. Two methods are currently used to modify the photometries of a prismatic transparent diffuser in order to meet the aforementioned characteristics. The first technique consists in applying a screen inside the diffuser, made of a sheet of aluminium or other suitable material with total absolute reflection properties. Although characterised by simplicity and low construction costs, this method does not guarantee satisfactory results. According to this technique, the luminous flow is directed downwards, with the risk of determining strong illumination contrasts that impair visual comfort for those who work in environments illuminated in this manner. A more advanced and more sophisticated method that is capable to achieve the established objectives completely consists in coating the diffuser either internally or externally with a very thin screening layer of metal particles, usually aluminium particles, deposited on the surface to be treated with vacuum metallization process. This known technology consists in low pressure sublimation and condensation of a metal in order to deposit a thin metal film on the surface to be treated. Low pressure permits metal molecules to achieve the condensation surface and being deposited starting from the sublimation source without encountering obstacles, such as air or other gaseous fluids. Before being treated, the surface to be metallized must be levelled with the application of a special product, having insulating and gripping properties with respect to metal molecules. A thin protection film must be applied onto the metallized surface in order to protect the thin metal film layer from oxidative degradation and mechanical abrasion, as well as from chemical aggression from perfumes, essences, etc. Apart from the good results that can be achieved, this method is impaired by complexity and difficult actuation that considerably affect final production costs of the diffuser. The purpose of the present invention is to devise a new method used to modify the photometries of a prismatic transparent diffuser, characterised by low actuation costs and satisfactory results with respect to the established objectives. The method of the invention consists in a painting process for the diffuser internal surface, characterised by the fact that the layer of metallized paint is used to cover only the two faces of each prism, leaving uncovered a very narrow longitudinal band on the bottom corner where the walls of each parallel pair of prisms converge. This allows to increase the reflecting properties of the prismatic diffuser, which maintains its original refracting capabilities only in the very narrow unpainted band where the desired effect of semi-transparency is created. This painting process is implemented by means of traditional spraying paint installations, using high-metallizing paints of the type available on the market. The painting process of the invention includes the following operating stages, in case of application on a prismatic diffuser shaped as a sphere with parabolic curve: - positioning of paint spraying nozzles inside the sphere to direct the paint spray in orthogonal direction to the first of the two faces of the prisms located on the internal wall of the diffuser;
- rotation of diffuser in clockwise direction and start of first painting stage of the internal surface; - stop of diffuser rotation and painting.
- overturning of paint spraying nozzles inside the sphere to direct the paint spray in orthogonal direction to the second of the two faces of the prisms located on the internal wall of the diffuser;
- rotation of diffuser in anticlockwise direction and start of second painting stage of the internal surface;
- drying of the paint layer applied on the internal face of the sphere. The duration of each painting stage changes according to the capacity of the spraying nozzles and rotation speed of the diffuser; in any case the painting stage must continue for the period of time that is necessary to cover the faces of the prisms with a paint layer of very few microns, leaving uncovered a very narrow longitudinal band, with width equal at least to two tenths of millimetre, on the bottom corner where the walls of each parallel pair of prisms converge. If paint with high resistance to weather and chemical agents, as well as high temperature is used, it will not be necessary to apply a protection film of transparent product over the layer of metallized paint. For major clarity the description of the method according to the invention continues with reference to the enclosed drawings, which are intended for purposes of illustration only and not in a limiting sense, whereby:
- Fig. 1 is a perspective view of the internal surface of a prismatic diffuser shaped as a sphere with parabolic curvature. - Fig. 2 is a perspective view of the external surface of a prismatic diffuser shaped as a sphere with parabolic curvature.
- Fig. 3 is a cross-section with a transversal plane to the prisms of a portion of diffuser obtained with the method of the invention.
- Fig. 4 shows the photometric diagram of a prismatic diffuser obtained with the method of the invention.
- Fig. 5 shows the photometric diagram of the same diffuser before being treated with the painting process of the invention. With reference to Figs. 1, 2 and 3, the diffuser (1) has a smooth external surface (1a) and an internal wall (1b) with a dense longitudinal series of prisms (1c), basically consisting in grooves with V-shaped cross-section, which extend from the top to base of the sphere in alternation with corresponding grooves. Both faces of the prisms (1c) are covered with a very thin layer (2), of about 1-3 microns, of metallized paint, except for a very narrow longitudinal band (3) on the bottom corner where the walls of each parallel pair of prisms
(1c) converge.
Fig. 3 also shows the direction of a ray of light (A) reflected by the painted surface of the prisms (1c) and a ray of light (B) refracted by the unpainted band (3). The diagram of Fig. 4 refers to a diffuser obtained with the method of the invention using an aluminium based paint, especially produced for this purpose, having the following characteristics:
- average granulometry of aluminium particles: 12-15 microns (ISO/DIN 13320-1)
- Final viscosity (D2/25°C): 40-55 (DIN53211)
- Final specific gravity (Kg./I): 0.870-0.910 (UNI 8910) - Dry weight (%): 3.2 -3.3 (UNI EN ISO 3251)
- Dry volume (%): 2.3-2.4 (UNI 8911) As shown in the diagram of Fig. 4, the diffuser obtained with the method of the invention has the following characteristics:
- reflection below 90° of most of the luminous flow emitted by the light source (DLOR ranging from 80 to 90%)
- cut-off angle not lower than 30°
- emission of a sufficient quantity of indirect light to eliminate excessive illumination contrast (ULOR ranging from 10 to 20%).

Claims

Claims
1) Method used to modify the photometries of a prismatic transparent diffuser, of the type composed of a sphere with a smooth external surface (1a) and an internal wall (1b) with a dense longitudinal series of prisms (1c), basically consisting in grooves with V-shaped cross-section, which extend from the top to base of the sphere in alternation to corresponding grooves, characterised in that the internal surface of the diffuser is painted with a thin layer of paint (2) with high reflecting properties, leaving unpainted a very narrow longitudinal band (3) on the bottom corner where the walls of each parallel pair of prisms (1c) converge.
2) Method as defined in the preceding claim, characterised in that the band (3) has a width not lower than two tenths of millimetre. 3) Method as defined in one or more of the preceding claims, characterised in that the layer of metallized paint (2) is obtained with traditional spraying paint installations.
4) Method as defined in one or more of the preceding claims, characterised in that it consists in a painting process that includes the following operating stages, in case of application on a prismatic diffuser shaped as a sphere with parabolic curvature:
- positioning of paint spraying nozzles inside the sphere to direct the paint spray in orthogonal direction to the first of the two faces of the prisms (1c) located on the internal wall of the diffuser (1);
- rotation of diffuser (1) in clockwise direction and start of first painting stage of the internal surface (1b); - stop of rotation of diffuser (1) and painting.
- overturning of paint spraying nozzles inside the sphere to direct the paint spray in orthogonal direction to the second of the two faces of the prisms (1c) located on the internal wall of the diffuser (1);
- rotation of diffuser (1) in anticlockwise direction and start of second painting stage of the internal surface; - drying of metallized paint layer (2) applied on the internal face of the sphere. 5) Method as defined in one or more of the preceding claims, characterised in that it uses an aluminium-based paint with the following characteristics:
- average granulometry of aluminium particles: 12-15 microns (ISO/DIN 13320-1)
- Final viscosity (D2/25°C): 40-55 (DIN53211) - Final specific gravity (KgJI): 0.870-0.910 (UNI 8910)
- Dry weight (%): 3.2 -3.3 (UNI EN ISO 3251)
- Dry volume (%): 2.3-2.4 (UNI 8911)
6) Prismatic transparent diffuser obtained with the method of the invention according to any one or more of the preceding claims.
7) Prismatic diffuser as defined in claim 6, characterised in that it is made of polycarbonate or polymethylmethacrylate or glass.
8) Prismatic diffuser as defined in claims 6 and/or 7, characterised in that it has a spherical, truncated-conical or truncated-pyramidal shape.
PCT/IT2004/000363 2004-06-22 2004-06-22 Method used to modify the photometrics of a prismatic transparent diffuser WO2005124227A1 (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
PCT/IT2004/000363 WO2005124227A1 (en) 2004-06-22 2004-06-22 Method used to modify the photometrics of a prismatic transparent diffuser

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012084482A3 (en) * 2010-12-21 2013-01-17 Osram Ag Illumination arrangement
WO2021094916A1 (en) * 2019-11-13 2021-05-20 Iguzzini Illuminazione S.P.A. Built-in lighting apparatus

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1956637A (en) * 1931-01-28 1934-05-01 Hygrade Sylvania Corp Spraying apparatus
US2523394A (en) * 1944-07-25 1950-09-26 Holophane Co Inc Direct lighting luminaire
FR1560421A (en) * 1967-06-28 1969-03-21
FR2005393A1 (en) * 1968-04-02 1969-12-12 Westfaelische Metall Industrie
US3654455A (en) * 1969-08-20 1972-04-04 Holophane Co Inc Luminaire
US6575601B1 (en) * 2002-03-15 2003-06-10 Lexalite International Corporation Lighting fixture optical assembly including relector/refractor and shroud

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1956637A (en) * 1931-01-28 1934-05-01 Hygrade Sylvania Corp Spraying apparatus
US2523394A (en) * 1944-07-25 1950-09-26 Holophane Co Inc Direct lighting luminaire
FR1560421A (en) * 1967-06-28 1969-03-21
FR2005393A1 (en) * 1968-04-02 1969-12-12 Westfaelische Metall Industrie
US3654455A (en) * 1969-08-20 1972-04-04 Holophane Co Inc Luminaire
US6575601B1 (en) * 2002-03-15 2003-06-10 Lexalite International Corporation Lighting fixture optical assembly including relector/refractor and shroud

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012084482A3 (en) * 2010-12-21 2013-01-17 Osram Ag Illumination arrangement
US9291333B2 (en) 2010-12-21 2016-03-22 Osram Gmbh Illumination arrangement
WO2021094916A1 (en) * 2019-11-13 2021-05-20 Iguzzini Illuminazione S.P.A. Built-in lighting apparatus
CN114729732A (en) * 2019-11-13 2022-07-08 伊古齐尼照明有限公司 Built-in lighting equipment

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