EP1232363A1 - Entblendungstransparent für leuchtkörper - Google Patents
Entblendungstransparent für leuchtkörperInfo
- Publication number
- EP1232363A1 EP1232363A1 EP00993114A EP00993114A EP1232363A1 EP 1232363 A1 EP1232363 A1 EP 1232363A1 EP 00993114 A EP00993114 A EP 00993114A EP 00993114 A EP00993114 A EP 00993114A EP 1232363 A1 EP1232363 A1 EP 1232363A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- prism
- luminous element
- prisms
- glare
- prism sheet
- 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
-
- 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
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S8/00—Lighting devices intended for fixed installation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
Definitions
- glare banners which consist of translucent material and cover the filament over its length.
- a translucent lamp cover for glare control of lamps with elongated lamps and a reflector arranged above the lamp is known, which closes the reflector opening and has stretched prisms on the side facing away from the lamp, which are intended to scatter the light passing through.
- the elongated prisms lie approximately parallel to one another and run transversely to the longitudinal axis of the lamp, the radiation angle of the luminous element along the lamp axis being limited, taking into account the refractive index of the material of the glare-free transparency.
- the prism cross-section has the shape of an isosceles triangle, the shape of the prism cross-section must be selected so that total reflection is excluded so as to influence the light distribution of the luminaire transverse to the lamp axis as little as possible.
- the luminous element is imaged on the visible surface of the glare-free transparency, the extremely bright image of the luminous element often being perceived as disturbing.
- Perceived luminance levels of approximately 80% to 100% of the luminance of the light source occur, measured in the field of view of a viewer, in particular in a sitting position.
- the known arrangement does not aim to glare the luminous element in the transverse direction.
- a lamp with a rod-shaped, horizontally arranged light source is known, which for The purpose of the glare control is surrounded by a pns film.
- the prisms are arranged parallel to one another and run parallel to the longitudinal axis of the housing.
- the prisms are designed in the form of an isosceles triangle and arranged symmetrically on the film arranged concentrically to the rod light source, a transparent protective tube being placed around the cylindrical prism body.
- the light rays radiated radially from the flashlight and the immediate neighboring rays enter the respective prism approximately perpendicularly through the prism base and are reflected by the prism surfaces which reflect the legs of the right-angled prism cross-section. In this way, the radial rays, which are the most intense of all emitted light rays, are thrown back into the light source and absorbed there, so that with this known arrangement, glare control can only be achieved with enormous light losses.
- DE 197 45 844 AI discloses the use of prism foils in front of the light exit opening of a reflector.
- the reflector and prism foil surround the luminous element.
- the prism contour is essentially a lanar surface, on one side of which the ribs of the actual prism structure are arranged.
- the long axis of the prisms is attached perpendicular to the lamp axis.
- the reflector In order to obtain a wide-beam (vehicle interior light) or a directional (vehicle signal light) light distribution, the reflector must be dimensioned so that the reflector and the prismatic film form an integral unit.
- the present invention is based on the object of further developing the generic anti-glare transparency in such a way that a completely glare-free and for the room impression uniform room illumination with the highest possible light intensity.
- a uniform light emission from the anti-glare device is achieved by such an arrangement of the prisms relative to the luminous element that the light beams impinging on this prism surface are totally reflected on at least one of the prism surfaces.
- Part of the light rays entering the prisms penetrates the glare-free transparency, while the other part of the rays of light that have entered is reflected back by total reflection.
- the light beam radiated radially from the light source onto the prisms is scattered.
- the prisms are to be arranged according to their cross-sectional shape and the refractive index of the material relative to the luminous element in such a way that partial reflection of the incident light rays on a prism surface is prevented from directly passing through the transparency by total reflection.
- the side of the anti-glare transparency facing the luminous element is expediently formed from essentially flat base surfaces of the prisms, the total reflection taking place on one of the prism surfaces on the side of the transparency lying beyond the luminous element.
- the totally reflected light beams are emitted from the exit the prisms are held beyond the filament.
- the transparency consists of a prism sheet with a prismatic surface on one side, which is arranged so as to cover the luminous element. According to the cross-sectional shape of the prisms, i.e.
- the prismatic film is to be attached at such a distance from the luminous element that the desired total reflection occurs on the prism surfaces.
- the prisms can be brought into the intended position in a simple manner by suitable curvature of the prism foil around the luminous element.
- the prisms advantageously have a triangular cross section, the base surface of the prisms corresponding to the base side of the triangular cross section and facing the luminous element. The part that strikes one of the leg surfaces of the prism is totally reflected by the light bundle that enters through the base surface, while the light bundle that strikes the other leg surface of the triangular prism shines through the anti-glare transparency under deflection.
- the leg surfaces correspond to the triangular sides of the prism cross section, which are angled to the base side.
- the prisms were particularly advantageously in the form of an isosceles triangle, the beam angle of the anti-glare transparency being adjustable as required by arching the prism foil. It is seen as advantageous if the totally reflected light bundles are thrown back next to the axis of the filament.
- the prisms with the cross-sectional shape of an isosceles triangle can easily be brought into the intended position by suitable curvature in which one of the Total reflection results in catheter surfaces if the base surfaces of the individual prisms are each at an angle deviating from 90 ° to the light rays hitting the respective prism.
- FIG. 1 is a view of a lamp with a glare control according to the invention
- FIG. 2 shows a cross section of a lamp with a glare control according to the invention
- Beam paths on a single prism in different angular positions of the prism cross-section to the filament
- FIG. 9 u. 10 schematic representations for the formation of the transparent geometry in the case of a curved film
- Fig. 1 shows a perspective view of a lamp 7, which is preferably attached to the ceiling to illuminate the room.
- the lamp 7 comprises a housing 3 in which an elongated luminous element 2 is arranged.
- a prism sheet la, lb, 1c is arranged on the open side of the housing 3 facing the room to be illuminated, which covers the luminous element 2 over its entire length.
- the prism film is made of translucent material and has a prismatic surface on the visible side, that is to say the side facing away from the luminous element 2.
- the prismatic surface is formed by continuous prisms lying next to one another approximately parallel to the longitudinal direction of the luminous element 2 and scattering the light bundle entering the inner side of the film.
- the anti-glare effect of the pinch film is determined by the relative position of the respective prism cross sections, which can be varied by the curvature radius of the prism film la, lb, lc.
- the desired glare effect can be individually adapted to the spatial conditions of the room to be illuminated by the radius of curvature around the luminous element 2.
- the optical mode of operation of the prism film for glare control of the luminous element 2 is explained in more detail below. In Fig.
- a medial curvature of the prism foil 1b leads to a light distribution curve which does not emit any light between approximately 60 ° and 90 ° to the vertical.
- the luminance in the light distribution curve is minimal in the angular range between approximately 75 ° and 90 ° to the vertical.
- Fig. 2 shows a cross section of a lamp housing 3 with a prism sheet 1 for glare control of the elongated filament 2.
- the prism sheet 1 covers the radiation sector of the filament 2 in the room to be illuminated over approximately 180 °.
- the prism film 1 is surrounded by a housing base 18 which can be designed to be highly transparent or structured in order to achieve optical lighting effects.
- the side edges of the prism sheet 1 and the housing base 18 lying parallel to the longitudinal axis of the luminous element 2 are enclosed in a housing carrier 22.
- the housing support 22 comprises two profile rails, which run approximately parallel to one another on both sides of the luminous element 2 and accommodate the edges of the prism film 1.
- the prism sheet 1 is fixed with such a width in the housing supports 22 that there is a curved course of the prisms around the luminous element 2.
- the anti-glare effect of the curvature of the prism sheet 1 is explained in more detail below.
- the prism foil is expediently arranged approximately mirror-symmetrically to a diameter axis of the luminous element 2, which lies perpendicular to the transverse axis between the housing supports 22, as shown in the present example.
- the housing supports 22 are provided on the top, ie opposite the prism sheet 1, with spacer elements 20 which support a housing roof 17.
- the housing roof 17 is designed to be transparent.
- the housing roof 17, the housing support 22 and the housing base 18 with the prism foil 1 located therein are arranged with respect to one another such that an air gap 19 is formed between the housing roof 17 and the housing base 18.
- an air gap 19 there is an exchange of air between the interior of the housing and the surroundings of the lamp 7, the air being able to circulate without particles falling into the housing gap 19 from above.
- Several length elements 20 are provided over the length of the lamp 7, on which there are Housing roof 17 are each fastened with clamps 21 or the like.
- the right side of the drawing shows a section at the height of a spacer 20, while the left half shows a section on a transverse plane of the lamp 7 between two spacers 20, the air gap 19 becoming clear.
- Figures 3 to 6 show the refraction ratios of the light beams on the prisms using the example of a prism shown individually.
- the prismatic film is arranged such that the base surface 8 faces the base side of the triangular cross section of the luminous element 2.
- the leg surfaces 11, 12 of the isosceles triangular cross section of the prism lie at an angle of 45 ° to the base surface 8, taking into account the distance between the prism 10 and the luminous element 2 in a certain range of the angle of attack of the base surface 8 to the radii of the base surface 8 Luminous body 2, the desired total reflection occurs on one of the leg surfaces 11, 12.
- Each prism of the prism foil lies in such an angular position with respect to the luminous element 2 that the light rays ⁇
- the light bundle 16 striking the upper leg surface 12 on the leg surface 12 is broken when it emerges from the prism and emitted into the space to be illuminated.
- the portion of the light rays 13 radially radiated from the luminous element 2 that strikes the lower leg surface 11 is totally reflected when it strikes the leg surface 11, the reflected light bundle 14 emerging in approximately orthogonal directions to the radiation sector ⁇ while refraction from the second leg surface 12.
- the angle of attack of the pris a ⁇ 10 or its base surface 8 to the luminous element 2 is approximately 15 ° in the present case. It is evident that the invention of allowing the light beam located in the prism to partially exit under diffraction and partially reflecting it back on a prism surface by total reflection is also possible with other prism cross sections than the isosceles triangle. For example, a triangular cross-section with different leg angles could be selected, whereby an exactly orthogonal alignment of the base surface to the luminous element 2 would also be possible. Further prism cross sections are also conceivable, such as trapezoidal cross sections or the like, with total reflection occurring on a prism surface due to the prism structure and length.
- Fig. 4 shows a prism 10 of the same geometry as in Fig. 3 in a position with a larger angle of attack to the filament 2, in the present case about 30 °. It is clear that the light rays 16, which are refracted on the upper leg surface 12 and penetrate the leg surface 12, in approximately the same direction as in the lower angular position A ⁇
- the angular position of the prism 10 relative to the luminous element 2 can accordingly influence the direction of radiation of the totally reflected light beams 14, which impinge on the lower leg surface 11 in the primate 10, given the length of the prism base 8, taking into account the distance of the prism from the luminous element 2.
- the direction of emission of the totally reflected light beams 14 can be varied in a larger angular range than the diffraction range of the only refracted light beams 16 when the upper leg surface 12 passes through.
- An enlargement of the angle of the prism base 8 leads, up to a critical angle, to a proportionately greater influence on the angular range of the total reflection than that of the refraction.
- the radiation angle ⁇ of the light beam striking the base surface corresponds to the prism arrangement according to FIG. 4.
- the inclination of the base surface 8 to the vertical corresponds to the prism according to FIG. 4 and is approximately 30 °.
- the light rays refracted on the base surface 8 are refracted on the lower leg surface 11 and deflected when emerging from the prism 10.
- the part of the beam that strikes the upper leg surface 12 is totally reflected and then strikes the other leg surface 11.
- the curvature of the prism sheet to the luminous element 2 determines the position of the individual prisms relative to the luminous element 2, where ⁇ at how the beam paths of the prisms same cross ⁇ -section of Fig. 4 and 5, point obtained by the relative position of the prisms, the desired Entblendungs strictlyen can be.
- the influence of the angle of inclination provided for total reflection on ⁇ aptly light beams limb surface against ⁇ to the base surface will be explained below with reference to Fig. 6 nä ⁇ forth.
- the angle of the leg surface 11 with respect to the base surface 8 is denoted by, the angles ⁇ 1 ( ⁇ 2 , ⁇ 3 , ⁇ 4 , ⁇ 5 corresponding to different prism angles between the leg and the base. If the base surface 8 is arranged at an angle of inclination ⁇ to the light source , there is a total reflection on the prism surface 11 if the following inequality is satisfied:
- ⁇ ⁇ tg arccos [sin ( ⁇ ) / n ⁇ + cos ( ⁇ )]
- n ⁇ in (ottg) l.
- FIG. 6 shows the basic angular relationships of the incident light beams in the prism and the deflection angle on a prism with an isosceles and right-angled triangular cross section, the inclination of the prism base to the luminous element 2 being approximately 15 °.
- the radiation sector ⁇ covered by this prism is approximately 40 ° between the boundary light rays incident at the base surface tips in accordance with the boundary incidence angles ⁇ ⁇ and ⁇ 2 . broken down.
- the light is deflected in the angular range between g ⁇ and g2 of approximately 30 °.
- the rays impinging on the left leg surface 12 are totally reflected and subsequently additionally refracted on the right leg surface 11, the refraction taking place towards the base surface 8, ie towards the luminous element 2.
- a second total reflection of the light rays already reflected on the first leg surface can also occur, taking into account the geometry of the prism. Due to the double total reflection, the entire angular range of the intended for total reflection thrown back first leg surface in the direction of the luminous element 2.
- the base surface 8 lies here approximately horizontally for a better overview.
- the inclination of the leg surfaces 11 is plotted at an angle of inclination] _i p] _ to ⁇ ] _i p 5 from the vertical.
- the curvature of the foil is chosen such that the individual prisms are each inclined in such a way that the desired glare control or the desired light distribution curve of the illuminants is achieved by total reflection.
- the inclinations of the individual prisms can be different, but taking into account the prism length and the respective distance from the luminous element, the angles of incidence on the leg surfaces within the prisms lie in the angular range of the total reflection.
- the angle of inclination of the prisms ⁇ is increased in the circumferential direction of the prism film around the luminous element in each case compared to the preceding prism.
- the increase in the angle of inclination between the prisms can be approximately in the angular range from 1 ° to 2 °.
- FIG. 9 An advantageous curvature contour of the prism film, in which the refractive area of the prisms is optimal, is shown in FIG. 9.
- the prism foil 1 is composed in the circumferential direction around the luminous element 2 from circular segments 9 with several prisms, the radii of curvature of the circular sectors in each case leading to an optimal expansion of the beam area in which the incident light is refracted.
- the course of the prism foil geometry is formed by fitting the circular segments 9 together, a subsequent circular segment 9 following the previous circular segment by rotating about the axis of the luminous element 2 such that the outer boundary beam of the contiguous circular segment contour is as congruent as possible with the inner boundary beam of the preceding circular segment contour.
- the film 1 is formed by a combination of circular segments as described above for FIG. 9.
- the ratio of the distance a between the luminous elements 2 and the prism sheet 1 to the respective curvature radius W is the same in each area of the prism sheet 1.
- Optimal glare control of the luminous body 2 by blanking out individual beam bundles on the way of total reflection on one leg surface of the prisms takes place with such a curvature of the prism film 1 that in each area of the prism film 1 the distance a of the luminous body 2 is less than the curvature radius W of the prism sheet 1.
- the refracted rays in the radiation area of the luminous element 2 of ⁇ ⁇ bi ⁇ ⁇ are directed into the angular areas of the critical angles ⁇ g ⁇ and ⁇ g2 , in each case with reference to the horizontal.
- the emission range of the luminous element 2 of ⁇ 60 ° is deflected in an angular range of ⁇ 30 °.
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19955435A DE19955435C1 (de) | 1999-11-18 | 1999-11-18 | Entblendungselement für langgestreckte Leuchtkörper |
DE19955435 | 1999-11-18 | ||
PCT/EP2000/011345 WO2001036867A1 (de) | 1999-11-18 | 2000-11-16 | Entblendungstransparent für leuchtkörper |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1232363A1 true EP1232363A1 (de) | 2002-08-21 |
EP1232363B1 EP1232363B1 (de) | 2006-10-11 |
EP1232363B2 EP1232363B2 (de) | 2013-03-27 |
Family
ID=7929440
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00993114A Expired - Lifetime EP1232363B2 (de) | 1999-11-18 | 2000-11-16 | Entblendungstransparent für leuchtkörper |
Country Status (6)
Country | Link |
---|---|
US (1) | US6863420B1 (de) |
EP (1) | EP1232363B2 (de) |
JP (1) | JP4733891B2 (de) |
AT (1) | ATE342471T1 (de) |
DE (2) | DE19955435C1 (de) |
WO (1) | WO2001036867A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7950833B1 (en) | 2008-06-17 | 2011-05-31 | Genlyte Thomas Group Llc | Splay frame luminaire |
US10302275B2 (en) | 2013-06-19 | 2019-05-28 | Bright View Technologies Corporation | Microstructure-based diffusers for creating batwing lighting patterns |
US10072816B2 (en) | 2013-06-19 | 2018-09-11 | Bright View Technologies Corporation | Microstructure-based optical diffusers for creating batwing and other lighting patterns |
US9765949B2 (en) | 2013-07-26 | 2017-09-19 | Bright View Technologies Corporation | Shaped microstructure-based optical diffusers for creating batwing and other lighting patterns |
DE102014215481A1 (de) * | 2014-08-05 | 2016-02-11 | Dürr Systems GmbH | Leuchte für eine Arbeitsumgebung, insbesondere zum Prüfen der Oberfläche von Werkstücken |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1612804A (en) † | 1925-03-11 | 1927-01-04 | Holophane Glass Company | Luminary |
US1941079A (en) † | 1931-09-05 | 1933-12-26 | Holophane Co Inc | Lighting apparatus employing rectilinear light sources |
DE1935927A1 (de) † | 1968-07-31 | 1970-02-05 | Goytisolo Ignacio Taltavull | Beleuchtungseinrichtung |
DE29608354U1 (de) † | 1996-05-08 | 1996-06-27 | Trilux Lenze Gmbh & Co Kg | Arbeitsplatzleuchte |
DE19712157A1 (de) † | 1997-03-22 | 1998-09-24 | Werner Rode | Vorrichtung zur Montage und Demontage von abnehmbaren Dachmodulen rigider Ausgestaltung von Kraftfahrzeugen, nämlich Cabriolets |
US5880886A (en) † | 1993-05-04 | 1999-03-09 | Milner; Peter James | Optical component suitable for use in glazing |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2356654A (en) * | 1944-08-22 | Catadioptric lens | ||
US3278743A (en) * | 1963-12-16 | 1966-10-11 | Holophane Co Inc | Street light refractor |
BE787114A (fr) * | 1971-08-05 | 1973-02-05 | Emerson Electric Co | Lentille prismatique pour appareil d'eclairage |
US4660131A (en) * | 1979-06-08 | 1987-04-21 | Peerless Lighting Corporation | Method for indirect lighting |
US4450509A (en) * | 1982-08-17 | 1984-05-22 | Thorn Emi Plc | Lanterns for area lighting |
DE3420414C2 (de) | 1984-06-01 | 1994-04-14 | Willing Gmbh Dr Ing | Lichtdurchlässige Leuchtenabdeckung zur Entblendung von Leuchten mit langgestreckten Lampen |
CA1279783C (en) | 1985-11-21 | 1991-02-05 | Minnesota Mining And Manufacturing Company | Totally internally reflecting thin, flexible film |
DE3841518A1 (de) | 1988-12-09 | 1990-06-13 | Trilux Lenze Gmbh & Co Kg | Spiegelrasterleuchte |
JPH04242002A (ja) * | 1991-01-17 | 1992-08-28 | Jiro Sugimoto | 照明器付属装置および照明装置 |
DE4115836C2 (de) * | 1991-05-15 | 1999-11-25 | Jordan Reflektoren Gmbh & Co | Leuchte mit einer Reflektoranordnung und einem Abblendkörper |
DE19745844C2 (de) * | 1997-10-16 | 1999-12-16 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Elektrische Leuchte mit einem Reflektor und einem Refraktorelement |
KR100271672B1 (ko) * | 1998-05-20 | 2000-11-15 | 구본준 | 시이트 구조의 광학소자 및 그를 이용한 백라이트 유니트 |
-
1999
- 1999-11-18 DE DE19955435A patent/DE19955435C1/de not_active Expired - Lifetime
-
2000
- 2000-11-16 AT AT00993114T patent/ATE342471T1/de active
- 2000-11-16 JP JP2001538717A patent/JP4733891B2/ja not_active Expired - Fee Related
- 2000-11-16 US US10/130,630 patent/US6863420B1/en not_active Expired - Lifetime
- 2000-11-16 EP EP00993114A patent/EP1232363B2/de not_active Expired - Lifetime
- 2000-11-16 WO PCT/EP2000/011345 patent/WO2001036867A1/de active Search and Examination
- 2000-11-16 DE DE50013614T patent/DE50013614D1/de not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1612804A (en) † | 1925-03-11 | 1927-01-04 | Holophane Glass Company | Luminary |
US1941079A (en) † | 1931-09-05 | 1933-12-26 | Holophane Co Inc | Lighting apparatus employing rectilinear light sources |
DE1935927A1 (de) † | 1968-07-31 | 1970-02-05 | Goytisolo Ignacio Taltavull | Beleuchtungseinrichtung |
US5880886A (en) † | 1993-05-04 | 1999-03-09 | Milner; Peter James | Optical component suitable for use in glazing |
DE29608354U1 (de) † | 1996-05-08 | 1996-06-27 | Trilux Lenze Gmbh & Co Kg | Arbeitsplatzleuchte |
DE19712157A1 (de) † | 1997-03-22 | 1998-09-24 | Werner Rode | Vorrichtung zur Montage und Demontage von abnehmbaren Dachmodulen rigider Ausgestaltung von Kraftfahrzeugen, nämlich Cabriolets |
Non-Patent Citations (2)
Title |
---|
HANDBUCH FÜR BELEUCHTUNG Bd. 4, 1975, ESSEN, Seiten 98 - 110 † |
See also references of WO0136867A1 † |
Also Published As
Publication number | Publication date |
---|---|
ATE342471T1 (de) | 2006-11-15 |
EP1232363B2 (de) | 2013-03-27 |
DE19955435C1 (de) | 2001-08-09 |
JP2003515239A (ja) | 2003-04-22 |
DE50013614D1 (de) | 2006-11-23 |
EP1232363B1 (de) | 2006-10-11 |
WO2001036867A1 (de) | 2001-05-25 |
US6863420B1 (en) | 2005-03-08 |
JP4733891B2 (ja) | 2011-07-27 |
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