EP1255908A2 - Venetian blind-type sun protection device - Google Patents
Venetian blind-type sun protection deviceInfo
- Publication number
- EP1255908A2 EP1255908A2 EP00944137A EP00944137A EP1255908A2 EP 1255908 A2 EP1255908 A2 EP 1255908A2 EP 00944137 A EP00944137 A EP 00944137A EP 00944137 A EP00944137 A EP 00944137A EP 1255908 A2 EP1255908 A2 EP 1255908A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- sun protection
- slats
- protection device
- top surface
- light
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
- E06B9/24—Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blinds
- E06B9/26—Lamellar or like blinds, e.g. venetian blinds
- E06B9/38—Other details
- E06B9/386—Details of lamellae
Definitions
- This invention relates to a sun protection device of the Venetian blind type, comprising a number of spaced apart slats, of which slats the respective longitudinal axes are located substantially in one plane and extend substantially parallel to each other, and which slats are provided with a top surface and a bottom surface and are of reflective design at least at their top surface.
- Such a sun protection device is known from EP 0 303 107.
- the slats are concavely curved in upward direction.
- the top surface of each of the slats is designed as a mirror. What is achieved with such a construction is that a considerable part of incident solar radiation is reflected, so that undesired heat concentration at the sun protection device is prevented.
- a disadvantage of the known construction is that it may entail nuisance to those living in the neighborhood due to the uncontrollable reflection from the mirror surfaces of the slats.
- the system may also entail a drawback for the users of the sun protection device, in that its use in a window may involve the slat-reflected light being in turn reflected from the pane in the window, which light, thus reflected twice, may have a disturbing effect in the space screened by the sun protection device.
- light reflected directly from the top surface may also be highly objectionable in the inner space. Due to these phenomena, it is not properly possi le to adjust the slats to any random angle.
- TO 2 574469 describes a sun protection device similar to EP 0 303 107, in which the top surface of the slats is designed as a flat or convex mirror surface.
- This sun protection device has the same disadvantages as the sun protection device according to EP 0 303 107.
- US 5 204 777 discloses a sun protection device according to the preamble of claim 1, in which the slats, at the top surface thereof, consist of mirror facets extending in longitudinal direction, with adjacent mirror faces of adjacent mirror facets including an angle of approximately 90° and having a stepped configuration viewed in cross section of the slat. With such a construction, light incident on the top surface is reflected back in a plane through the longitudinal axis of the mirror facet and the direction of incidence, regardless of the adjustment angle of the slats.
- a disadvantage of this construction is that though the incident light is reflected back in one longitudinal plane defined by the longitudinal axis and the direction of incidence, the direction in which this light exits in this plane, leaving aside the direction of the normal, deviates from the direction in which the light enters. Only when the direction of incidence in the longitudinal plane formed by the direction of incidence and the longitudinal axis corresponds with the normal to the local slat surface is the direction of incidence equal to the direction of exit. As a consequence, in the construction according to US 5 204 777 too, the light reflected back can also entail a nuisance to those living in the neighborhood.
- DE 197 00 111 describes a similar sun protection device to US 5 204 777, in which the mirror elements extending in the longitudinal direction, in cross section of the slat, have a sawtooth configuration.
- this sun protection device too light incident at an angle with respect to a normal plane extending in transverse direction of the slat exits mirrorwise with respect to the transverse normal plane.
- the direction in which the light exits in the longitudinal plane defined by the longitudinal axis and the direction of incidence, leaving aside the direction of the normal deviates from the direction in which the light enters. The light reflected back can therefore entail a nuisance to those living in the neighborhood in a similar manner as in US 5 204 777.
- the invention contemplates a sun protection device of the type mentioned in the preamble, in which, while maintaining the advantages, the disadvantages mentioned are avoided.
- each of the slats is of retroreflective design, such that, for every angle of incidence, light incident on the top surface is reflected back in the direction of incidence, is that incident light, regardless of the direction of incidence, is reflected back to the source, so that any nuisance to the environment is avoided-
- the direction in which the light enters the longitudinal plane defined by the longitudinal axis and the direction of incidence is equal to the direction in which the light exits in the plane, also when it deviates from the perpendicular direction.
- the slats can have an upright, horizontal or oblique orientation, but preferably have their longitudinal axes extend virtually horizontally.
- the plane in which the longitudinal axes of the slats are located can be at least partly curved, such as, for instance, a tunnel-shaped plane having a U-shaped cross section.
- the plane in which the longitudinal axes are located can also be substantially flat, for instance vertical, horizontal or oblique.
- the slats have their longitudinal axes located in a substantially vertical plane.
- the heat load by solar irradiation is reduced to a still greater extent than in slats having a mirror surface.
- a large part of the "upper hemispheric" incident light (sun, blue sky, luminqus clouds) is reflected directly in the direction of incidence. As a consequence, fewer multiple reflections are obtained, which could otherwise give rise to heat generation.
- the sun protection device according to the invention enables a relatively strong daylight entrance in a non-disturbing manner. The light is transmitted in a selective and metered manne_r.
- the top surface of the slats is of retroreflective design through a layer or coating applied thereto, which contains transparent glass or plastic beads.
- retroreflective material is, for instance, the material ScotchJite High Intensity Grade carried by the firm 3M.
- the top surface of the slats is of retroreflective design by a layer or coating applied thereto which contains total-reflection prisms.
- retroreflective material is, for instance, the material Scotchlite Diamond Grade VIP carried by the firm 3M.
- the layer or coating is in the form of a self- adhesive film or self-adhesive tape.
- retroreflective material on slats of a sun protection device is known per se from the above-mentioned European patent 0 303 107.
- the underside of the slats is retroreflective. The purpose of that is to screen the workplace from possibly blinding radiation coming from the ground outside the building, without having to take recourse to blackening the underside of the slats.
- the setting means are adapted for progressively modifying the setting angle of each of the slates in upward direction. This makes it possible to further optimize screening and light entrance.
- the adjusting means can be computer-controlled means which are adapted for automatically controlling the setting angle of each of the slats based on a function of time and/or of the measured luminance.
- the sun protection device according to the invention with the retroreflective top surfaces of the slats can suitably form part of a sun protection system for an (accommodation) space in a building, in which one or more sun protection devices according to the invention are arranged in a window or windows of the space in question and wherein there is provided an array of directed or d rectable reflectors mounted on or near the ceiling of the space on the side of the sun protection device(s) to direct light transmitted by the sun protection device(s) to the location of the array of reflectors, to a place in the space which it is desired to light additionally.
- a metered quantity of the "directed sunlight” can be sent to a site of choice, for instance a workplace or to a wall which it is desired to illuminate additionally.
- the preferred site for such a directed reflective optical system is close to the window in front of which the sun protection device according to the invention is located, since at that point virtually throughout the year, a reasonable amount of light becomes available.
- the optical system can be integrated with the artificial lighting in the space in question, including a control system for metering the necessary amount of supplemental artificial light.
- the invention is elucidated with reference to the drawing, in which the single figure is a schematic representation of a sun protection device according to the invention included in a sun protection system.
- a sun protection device 1 of the Venetian blind type is represented in cross section.
- the sun protection device 1 comprises a number of elongate slats 2.
- the longitudinal axes of the spaced apart slats 2 extend in horizontal direction, are parallel to each other and are located in a vertical plane.
- the sun protection device 1 comprises the conventional means (not shown) for varying the setting angle of the slats 2.
- the sun protection device 1 is arranged along a pane 3 of a window in a space to be screened.
- those slats 2, at least on the top surface or window side, are retroreflective in that those slats 2 on that side consist of retroreflective material. That material can be provided on the slats 2 as a layer.
- a layer is in the form of a self-adhesive film or a self-adhesive band or tape.
- Retroreflective material is material that reflects incident light, regardless of the angle of incidence, for the most part back to the light source.
- Such material can be a material based on transparent glass or plastic beads, for instance as marketed by 3M under the name of Scotchlite High Intensity Grade.
- Such material can also be a material based on total- reflection prisms, for instance as marketed by 3M under the name of Scotchlite Diamond Grade VIP.
- Such genuine retroreflective material when applied to the top surface of the slats 2, has the advantage that the surroundings are not hindered by reflected light from, for instance, the sun, since the sunlight is exclusively reflected back in the direction of the sun.
- the sun protection device affords the possibility of a relatively strong daylight admission in a non-disturbing manner.
- the light is transmitted in a selective and metered manner. This proceeds in different ways, as follows.
- a large part of the low-luminance lower hemispheric light coming from the ground 4 of the space outside the space to be screened is transmitted directly by the sun protection device 1, in that it can pass between the slats 2, as indicated by arrows 5 and 6 enclosing an angle ⁇ .
- the luminance of ground or lawn can actually be more than 5,000 cd m 2 .
- the transmitted light is diffuse light ending up substantially on the ceiling 7 in the vicinity of the window 3.
- Direct solar radiation is reflected by the slats 2 in the direction of the sun, as indicated by the double-headed arrow 8. A part of the reflected light will in turn be reflected from the window 3 in the direction of the ceiling 7. This is indicated by the arrow 9.
- This directed component of the direct solar radiation reflected from the pane glass towards the ceiling can account for 5 to 8% of the total solar radiation. The higher the sun is in the sky, the steeper the angle at which this directed component enters the space to be screened and the closer to the window 3 the ceiling 7 is illuminated thereby.
- the light travels as a homogeneous parallel beam and thus causes a homogeneous luminance of the ceiling 7 over the entire irradiated surface.
- the additional optical system can, if desired, be integrated with the artificial lighting of the space to be screened and be coupled with a control system to meter the needed amount of supplemental artificial light- Diffuse light coming from the blue or cloudy sky (having a luminance of sometimes more than 10,000 cd m 2 ) is reflected, for each small area of the sky, in the same way as the sunlight, albeit that, obviously, a smaller amount of light is involved.
- this diffuse light after retro-reflection from the slats 2, is likewise reflected by the window 3 and, after passing between the slats 2, reaches approximately the same position on the ceiling as the "transmitted ground light".
- the retroreflective surface on the slats can be alternated with a non-retroreflective or less strongly retroreflective surface, so that a pattern, such as a logo, can be formed. Such a pattern can be visible at night when, for instance, lights of oncoming traffic shine upon the sun protection.
- a pattern may also be formed by setting the slats of some sun protection devices of a building in a non-reflecting position, by means of a control, while other sun protection devices are set in a reflecting position, for instance by angular displacement and or raising or lowering the slats.
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Blinds (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Specific Sealing Or Ventilating Devices For Doors And Windows (AREA)
- Time-Division Multiplex Systems (AREA)
- Door And Window Frames Mounted To Openings (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL1012238 | 1999-06-04 | ||
NL1012238A NL1012238C2 (en) | 1999-06-04 | 1999-06-04 | Blinds of the blind type. |
PCT/IB2000/000939 WO2001002687A2 (en) | 1999-06-04 | 2000-06-05 | Venetian blind-type sun protection device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1255908A2 true EP1255908A2 (en) | 2002-11-13 |
EP1255908B1 EP1255908B1 (en) | 2004-01-14 |
Family
ID=19769312
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00944137A Revoked EP1255908B1 (en) | 1999-06-04 | 2000-06-05 | Venetian blind-type sun protection device |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1255908B1 (en) |
AT (1) | ATE257900T1 (en) |
AU (2) | AU5837000A (en) |
DE (1) | DE60007780T2 (en) |
NL (1) | NL1012238C2 (en) |
WO (2) | WO2001002687A2 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL1016790C2 (en) * | 2000-12-04 | 2002-06-05 | Etap Nv | Sun blind system for rooms in buildings, uses slats with reflective upper sides in combination with reflective surface on ceiling |
DE20209365U1 (en) * | 2002-06-15 | 2003-10-23 | Hüppe Form Sonnenschutzsysteme GmbH, 26133 Oldenburg | Slatted blinds and slats for slatted blinds |
DE202005000415U1 (en) | 2005-01-07 | 2005-05-04 | Deutsche Post Ag | shade |
FR2922938B1 (en) * | 2007-10-31 | 2009-12-11 | Somfy Sas | METHOD FOR AUTOMATICALLY CONTROLLING A SOLAR PROTECTION SCREEN INSTALLATION COMPRISING RETRO-REFLECTIVE BLADES. |
EP2221442A1 (en) * | 2009-02-20 | 2010-08-25 | Kvadrat A/S | Sun shield |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2574469A1 (en) * | 1984-12-11 | 1986-06-13 | Promovence Sarl | Device for solar protection of glazed volumes |
CH675015A5 (en) * | 1986-09-15 | 1990-08-15 | Peter A Balla | |
AT394882B (en) | 1987-08-10 | 1992-07-10 | Bartenbach Christian | GLARE PROTECTION DEVICE |
US5204777A (en) * | 1992-01-23 | 1993-04-20 | Sea Corporation | Energy efficient skylight and blind |
DE4215968A1 (en) * | 1992-05-18 | 1993-12-02 | Zumtobel Licht | Light guiding structure for illuminating at least part of room with daylight - utilises daylight entering room through window assisted by elements located on wall or ceiling to reflect the light |
DE19632684A1 (en) * | 1996-08-14 | 1998-02-19 | Idl Ind Und Licht Design Gmbh | Lamella louvre blind |
DE19700111C2 (en) * | 1997-01-03 | 2003-02-06 | Fraunhofer Ges Forschung | Sun protection device in the manner of a blind |
-
1999
- 1999-06-04 NL NL1012238A patent/NL1012238C2/en not_active IP Right Cessation
-
2000
- 2000-06-05 EP EP00944137A patent/EP1255908B1/en not_active Revoked
- 2000-06-05 AU AU58370/00A patent/AU5837000A/en not_active Abandoned
- 2000-06-05 WO PCT/IB2000/000939 patent/WO2001002687A2/en active IP Right Grant
- 2000-06-05 AT AT00944137T patent/ATE257900T1/en not_active IP Right Cessation
- 2000-06-05 DE DE60007780T patent/DE60007780T2/en not_active Expired - Fee Related
- 2000-06-05 AU AU58371/00A patent/AU5837100A/en not_active Abandoned
- 2000-06-05 WO PCT/IB2000/000938 patent/WO2000077337A2/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO0102687A3 * |
Also Published As
Publication number | Publication date |
---|---|
DE60007780T2 (en) | 2004-11-11 |
AU5837000A (en) | 2001-01-02 |
ATE257900T1 (en) | 2004-01-15 |
NL1012238C2 (en) | 2000-12-06 |
WO2000077337A2 (en) | 2000-12-21 |
DE60007780D1 (en) | 2004-02-19 |
WO2000077337A3 (en) | 2002-10-17 |
EP1255908B1 (en) | 2004-01-14 |
WO2001002687A3 (en) | 2002-09-06 |
WO2001002687A2 (en) | 2001-01-11 |
AU5837100A (en) | 2001-01-22 |
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