EP1954980A1 - Dispositif retroreflechissant a eclairage interne - Google Patents

Dispositif retroreflechissant a eclairage interne

Info

Publication number
EP1954980A1
EP1954980A1 EP06838707A EP06838707A EP1954980A1 EP 1954980 A1 EP1954980 A1 EP 1954980A1 EP 06838707 A EP06838707 A EP 06838707A EP 06838707 A EP06838707 A EP 06838707A EP 1954980 A1 EP1954980 A1 EP 1954980A1
Authority
EP
European Patent Office
Prior art keywords
retroreflective
housing
internally illuminated
disc
retroreflective device
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.)
Withdrawn
Application number
EP06838707A
Other languages
German (de)
English (en)
Other versions
EP1954980A4 (fr
Inventor
Alan R. Parker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3M Innovative Properties Co
Original Assignee
3M Innovative Properties Co
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 3M Innovative Properties Co filed Critical 3M Innovative Properties Co
Publication of EP1954980A1 publication Critical patent/EP1954980A1/fr
Publication of EP1954980A4 publication Critical patent/EP1954980A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/16—Signs formed of or incorporating reflecting elements or surfaces, e.g. warning signs having triangular or other geometrical shape

Definitions

  • FIGS. Ia and Ib show a prior art pedestrian crossing commonly referred to as a
  • the Belisha Beacon 10 includes a colored plastic globe 12 housing a flashing interior light (not shown) housed within globe 12. The interior light is normally powered by a bulb on a flashing circuit. The flash commonly lasts one second in both the on and off states.
  • This type of beacon 10 is typically mounted on a black and white pole 16 or post positioned adjacent to either side of a pedestrian crossing 18.
  • the Belisha Beacon 10 provides motorists with additional visibility to pedestrian crossings, especially at night. Belisha Beacons are commonly used in the United Kingdom, Ireland, and in the former British crown colonies of Singapore and Hong Kong. However, this type of prior art beacon has some drawbacks.
  • the globe is illuminated by an internal light source and is intended to "glow in the dark," the globe is translucent and thus provides limited daytime visibility.
  • the colored globe is typically made of a non-colorfast plastic material, so that the beacon adds little daytime or even nighttime visibility as the beacon ages. As the color of the globe fades, the ability of a pedestrian or driver to differentiate the color of the beacon from other lights diminishes, especially at night.
  • the fuse or bulb of the internal light source burns out, the globe no longer functions at night, since visibility of the beacon at night without internal illumination is limited.
  • FIGS. 2a and 2b show a prior art pedestrian crossing beacon disc 30 including first and second opposed retroreflective surfaces 32 and 34 separated by a minimal disc thickness. Similar to the Belisha Beacon, discs 30 are typically mounted on a black and white pole or post 16 positioned adjacent to either side of a pedestrian crossing 18. While the pedestrian crossing beacon discs have many advantages over the prior art Belisha Beacons, these discs also have some drawbacks. First, these pedestrian crossing beacon discs provide limited nighttime visibility because the discs are only visible at night when the retroreflective material is within range of, and illuminated by, an external light source, such as by vehicle headlights. Second, the discs can become discolored by traffic grime and pollution, resulting in reduced effectiveness.
  • the internally illuminated retroreflective device can, for example, be used as a pedestrian crossing.
  • the internally illuminated retroreflective device has a wider field of use and that the present application is not limited to the described construction and uses and that the present applicant intends this disclosure to include all constructions and uses.
  • One embodiment of the present application is an internally illuminated retroreflective device that includes a cylinder having two generally parallel opposed ends separated by a cylindrical surface and a light source housed within the area formed by the cylindrical surface.
  • the device also includes at least one circular disc that is capable of attachment to at least one of the opposed ends of the cylinder.
  • Each circular disc includes an optically transmissive material affixed to a retroreflective material, and each disc may be attached to the cylinder such that the optically transmissive material is adjacent to the cylindrical surface.
  • an internally illuminated retroreflective device including a housing having an open end and a light source positioned within the housing.
  • the internally illuminated retroreflective device further includes at least one disc that is capable of attachment to the open end.
  • the disc includes a retroreflective material and may include an optically transmissive material.
  • an internally illuminated retroreflective device including (1) a primary light source that emits light and that is positioned within a housing; and (2) a retroreflective material positioned adjacent to the housing such that light emitted by the primary light source passes through the housing and the retroreflective material.
  • Another embodiment of the present application is a disc that includes an optically transmissive polymeric material affixed to a retroreflective material.
  • the disc is capable of attachment to an internally illuminated retroreflective device that includes (1) a housing and (2) a light source positioned within the housing.
  • FIGS. Ia and Ib are, respectively, a schematic diagram and a cross-sectional view of a prior art Belisha Beacon.
  • FIGS. 2a and 2b are schematic diagrams of a prior art pedestrian crossing beacon disc.
  • FIG. 3 is a front view of one embodiment of an internally illuminated retroreflective device.
  • FIG. 4 is a perspective view of the internally illuminated retroreflective device of FIG. 3.
  • FIG. 5 is a side view of the internally illuminated retroreflective device of FIG. 3.
  • FIG. 6 is an exploded view of the internally illuminated retroreflective device of FIG. 3.
  • FIG. 7 is a cross-sectional view of the internally illuminated retroreflective device of FIG. 3 from the side view of FIG. 5.
  • FIGS. 8a and 8b are respective perspective and rear views of one embodiment of an internally illuminated retroreflective device.
  • FIGS. 9a and 9b are respective perspective and rear side views of one embodiment of an internally illuminated retroreflective device.
  • FIGS. 10a and 10b are respective perspective and side views of one embodiment of an internally illuminated retroreflective device.
  • FIGS. 11a, l ib, and l ie are respective perspective, front, and side views of one embodiment of an internally illuminated device.
  • an internally illuminated retroreflective device optionally adapted to be attached to a support means, including a light source positioned within a housing. At least a portion of the housing comprises, has applied thereto, or has attached to it a retroreflective material.
  • the retroreflective material is positioned adjacent to the housing such that light emitted by the primary light source passes from the interior to the exterior of the housing through the retroreflective material.
  • at least a portion of the housing may be formed of an optically transmissive material that permits light to pass from the interior of the housing to the retroreflective material.
  • the internally illuminated retrorefiective device may, for example, be used as a pedestrian crossing beacon.
  • FIGS. 3-7 show various views of one exemplary embodiment of an internally illuminated retroreflective device 100 attached to a support means 102.
  • internally illuminated retroreflective device 100 is side-mounted to a substantially vertical support means 102 (shown as a hollow post or pole) via two u-clasps 103 that are removably attached to retroreflective device 100.
  • Retroreflective device 100 includes a housing 104, which is shown in FIGS. 3-7 as a substantially cylindrical housing having two circular open ends 106 and 108. Onto at least one of circular open ends 106 and 108 of housing 104 may be fitted or attached a disc 112 that includes a retroreflective material 114 adhered to an optically transmissive material 116.
  • disc 112 is affixed to housing 104 by (1) positioning disc 112 adjacent to one of open ends 106 and 108 such that optically transmissive material 116 is adjacent to the surface of housing 104; and (2) placing a circular rim 118 adjacent to retroreflective material 112 and attaching or affixing circular rim 118 to cylindrical housing 104 using a fastening mechanism 122, such as, for example, screws or nails.
  • a fastening mechanism 122 such as, for example, screws or nails.
  • circular rim may be screwed onto housing 104 and will not include a fastening mechanism.
  • discs 112 may be quickly and easily removed and replaced if or when retroreflective material 114 experiences optical degradation.
  • Fitted within housing 104 is a light source.
  • FIGS. 3-7 show an embodiment in which primary light source 124 includes two light bulbs 126. But any light source known to those of skill in the art may be employed in the internally illuminated retroreflective device of the present application.
  • housing 104 is substantially cylindrical and includes two circular open ends 106 and 108.
  • a preferred size of cylindrical housing 104 is approximately 500 mm in diameter and approximately 150 mm in depth, which is the size preferred or required when internally illuminated retroreflective device 100 is used as a Belisha Beacon for pedestrian crossings in New Zealand.
  • the size and shape of device 100 and of housing 104 may be configured to any desired specifications appropriate for the desired use of the internally illuminated retroreflective device.
  • FIGS. 8-11 show some exemplary alternative shapes of housing 104.
  • FIGS. 8a and 8b show triangular and rectangular internally illuminated retroreflective devices, respectively 150 and 152.
  • FIGS. 9a and 9b show a different type of cylindrical housing 154.
  • FIGS. 11a, l ib, and l ie show a polygonal retroreflective device 170. Each of these retroreflective devices will be discussed in greater detail below.
  • Housing 104 may be constructed from any material with sufficient durability appropriate to the desired use of the internally illuminated retroreflective device.
  • Exemplary materials include metal, wood, retroreflective or reflective material, plastic, and the like.
  • One exemplary preferred metal for use in constructing the housing is aluminum, and one exemplary preferred plastic is polycarbonate.
  • Exemplary methods by which the housing may be formed include, for example, extrusion, roll forming, molding, casting, boring, and other similar methods.
  • housing 104 preferably includes open portions, such as circular open ends 106 and 108 in the embodiment shown in FIGS. 3-7.
  • open portions such as circular open ends 106 and 108 in the embodiment shown in FIGS. 3-7.
  • a disc that includes an optically transmissive retroreflective material.
  • one exemplary embodiment of the disc includes only retroreflective material.
  • Another exemplary embodiment of the disc includes an optically transmissive material that is attached to or positioned adjacent to a retroreflective material.
  • housing 104 may or may not include open portions such as circular open ends 106 and 108.
  • housing 104 is formed of an optically transmissive material other than a retroreflective material
  • at least a portion of housing 104 preferably has a retroreflective material attached, applied, or adjacent to housing 104.
  • housing 104 is preferably formed of a clear, non-reflective material, and more preferably a clear, non-reflective, and colorless material.
  • housing 104 may or may not include open portions, such as circular open ends 106 and 108.
  • the retroreflective material preferably has sufficient durability for the desired use of the retroreflective device. Further, the retroreflective material preferably has sufficient flexibility to ensure its even and aesthetically pleasing application to housing 104.
  • housing 104 is formed of more than one material, preferably at least one of which is a material listed above.
  • Disc 112 may be positioned adjacent to, fitted into, or affixed to at least a portion of housing 104.
  • the use of disc 112 may be especially preferred in embodiments including at least one open end, such as the open ends 106 and 108 of FIGS. 3-7.
  • One embodiment of disc 112 includes an optically transmissive (e.g., translucent or transparent) material 116 onto or adjacent to which a retroreflective material 114 is applied, affixed, or positioned.
  • disc 112 may include only a sheet of retroreflective material, or may include additional layers, such as liners, protective films, colored films, enhancing films, and the like.
  • optically transmissive materials include plastics, glass, and other similar materials.
  • One exemplary plastic that is capable of use in the present application is polycarbonate.
  • optically transmissive material 116 is a clear, rigid material.
  • Optically transmissive material 116 may be colored or colorless.
  • disc 112 is removably attached, affixed, or positioned adjacent to housing 104.
  • the removability of disc 112 from housing 104 facilitates removal and/or replacement of retroreflective material 114 and/or optically transmissive material 116 from housing 104, due, for example, to wear, mechanical damage, or to a desire to change the color or other properties of the retroreflective or optically transmissive materials.
  • Disc 112 may be attached or affixed or held adjacent to housing 104 using any known fastening means suitable for the intended use of the internally illuminated retroreflective device. Some exemplary fastening means include bolts, screws, nails, adhesive, and screwable attachments, threaded attachments, and the like. Disc 112 may be threaded or screwed onto housing 104. Additionally, as is shown in FIGS. 3-7, disc 112 may include or be positioned adjacent to a rim 118 that is attached, affixed, or positioned adjacent to housing 104.
  • Rim may be formed of any material appropriate to the intended end use of internally illuminated retroreflective device 100, and one exemplary material includes black cast vinyl 3M ScotchalTM Graphic Film, such as 3650, 180, and 7725 manufactured by the assignee of the present application.
  • the entire edge of disc 112 is fully covered by rim 118 and thus weather protected.
  • One exemplary over cover is between approximately 0.3 mm and 3 mm, but this will vary based on the size and shape of housing 104 and the intended use of retroreflective device 100.
  • one preferred retroreflective material is a non-metalized microprismatic retroreflective material, such as, for example, Diamond GradeTM translucent microprismatic sheeting, such as 3990T and 4090T manufactured by 3M Company (the assignee of the present application).
  • the retroreflective material is preferably translucent to enable light to be transmitted from the side of the retroreflective material that is adjacent to or comprises the exterior of the housing to the outwardly facing side of the retroreflective material and/or the exterior of the housing.
  • One side of the retroreflective material may optionally comprise an adhesive material.
  • the adhesive material facilitates application and adherence of the retroreflective material to a portion of the external surface of the housing or to the optically transmissive material in the disc.
  • the adhesive material may include a protective liner that is removed when the retroreflective material is applied to the external surface of the housing or to the optically transmissive material in the disc.
  • the retroreflective material may optionally be colored, which may improve the daytime and/or nighttime visibility of the internally illuminated retroreflective device.
  • the retroreflective material has a fluorescent color, such as, for example, orange, yellow, or yellow-green.
  • the retroreflective material is removable from the housing or disc, which allows the retroreflective material to be removed or replaced, due, for example, to wear, or due to a desire to change the color or other properties of the retroreflective material.
  • the internally illuminated retroreflective device optionally includes a protective overlay film on the exterior side of each portion of retroreflective material.
  • the light source may be any light source capable of placement within housing 104.
  • the light source may be adapted to flash, which may serve to help the internally illuminated retroreflective device stand out from its surroundings or may be so designed to meet assigned specifications.
  • the device may optionally be attached to a support means, such as support means 102 of FIGS 3- 7.
  • the support means may be any structure that serves to elevate the internally illuminated retroreflective device above the level of the pedestrian crossing where the device is placed.
  • the support means preferably allows the internally illuminated retroreflective device to be visible to vehicles and pedestrians before they cross the pedestrian crossing.
  • the internally illuminated retroreflective device is preferably visible to the driver of the vehicle when the vehicle comes within a reasonable distance of the pedestrian crossing. This "reasonable distance" may be governed by local traffic rules or regulations.
  • Suitable support means include, for example, posts, poles, vertical or horizontal railings, and the like.
  • the internally illuminated retroreflective device may also be attached to stationary objects, such as, for example, frameworks or buildings. Where a support means is present, the internally illuminated retroreflective device may be attached to the support means in any way that does not substantially disadvantage the desired use of the internally illuminated retroreflective device.
  • One exemplary attachment means is shown in FIGS. 3-7, in which housing 104 is side-mounted to a post or pole via an external mounting bracket, specifically by two u-clasps 103.
  • any mechanical or chemical attachment device may be used, including, for example, screws, bolts, nails, adhesives, bands, clamps, and the like.
  • part of the curved surface forming the substantially cylindrical housing may be slightly flattened, so as to facilitate side-mounting attachment of housing 104 to support means 102 and/or to facilitate accommodation of the primary light source 124.
  • the cross-section of the cylindrical housing may thus be substantially circular, with a small segment of the circular cross-section removed.
  • a separate bracket may adapt the housing, such as, for example, a circular housing, for attachment or positioning adjacent to the profile of any support means.
  • the housing may be attached or placed adjacent to the top of a support means, such as, for example, a post.
  • FIGS. 8-11 show some exemplary alternative embodiments of the internally illuminated retroreflective device of the present application. FIGS.
  • FIGS. 8a and 8b are respective perspective and side views showing a support means 156 to which is attached or affixed a triangular-shaped internally illuminated retroreflective device 150 and two rectangular-shaped retroreflective devices 152. At least one of the devices 150 and 152 attached to support means 156 is an internally illuminated retroreflective device of the present application, and the other devices attached to support means 156 may be prior art devices. The mechanism by which triangular-shaped device 150 is attached to support means 156 may be used in connection with any of the internally illuminated retroreflective devices of the present application.
  • FIGS. 9a and 9b are respective perspective and side views showing a support means
  • Retroreflective device 154 is attached, affixed, or mounted to the top of support means 156. Consequently, some embodiments of retroreflective device 154 may not include open portions to which may be attached a disc. Instead, retroreflective device 154 may have a flexible retroreflective material attached, affixed, or positioned adjacent to the housing of retroreflective device 154. In an alternative embodiment of retroreflective device 154, a portion of the housing may include an open portion to which may be attached a disc. For example, the housing may include an open portion into which may be slid a panel that includes a retroreflective material.
  • FIGS. 10a and 10b show respective perspective and side views of another alternative embodiment of an internally illuminated retroreflective device of the present application.
  • Retroreflective device 160 includes two separate internally illuminated components, upper component 162 and lower component 164. Both components are substantially elliptical or oval-shaped and are connected to one another via a fastening means 166.
  • Upper component 162 includes text
  • lower component 164 includes pictorials or schematics. The text, pictorials, or schematics may, of course, differ from those shown in FIGS. 10a and 10b, which are merely exemplary.
  • Retroreflective device 160 may be top, bottom, or side-mounted, as is appropriate for its intended use.
  • FIGS. 11a, l ib, and l ie are respective perspective, front, and side views of an internally illuminated retroreflective device 170 that is bottom-mounted to a support means 172 via attachment mechanism 174.
  • Retroreflective device 170 is a polygon-shape, specifically, a hexagonal shape, and includes text on at least one side of retroreflective device 170.
  • the text on retroreflective device 170 may, of course, differ from that shown in FIGS. 11a, l ib, and l ie, which are merely exemplary.
  • retroreflective device 170 may include pictorials or schematics rather than or in addition to text.
  • implementations of this embodiment exist, including, for example, (1) implementations in which only the text or pictorial includes retroreflective material; (2) implementations in which the text or pictorial is printed on the top surface of a retroreflective sheeting; and (3) implementations in which the retroreflective device includes apertures (such as, for example, apertures that create the text or pictorials).
  • internally illuminated retroreflective device may include a auxiliary or subsidiary light source that is positioned to enable it to emit light waves that pass or are transmitted through an optional secondary portion of the housing that may or may not comprise retroreflective material or have retroreflective material applied thereto.
  • Secondary portion of the housing is preferably, but need not be, clear and non-reflective, which facilitates transmission of light from the primary and/or the auxiliary light source to the exterior of the housing.
  • a clear, non-reflective secondary portion of the housing may be in the form of a window formed of clear, non-reflective material.
  • the secondary portion of the housing may comprise one or more apertures in the housing.
  • the internally illuminated retroreflective device is attached, affixed, or positioned adjacent to a support means and erected or placed near a pedestrian crossing such that the retroreflective portions of the device are perpendicular to the direction of the pedestrian crossing.
  • This embodiment facilitates the direction of light waves emitted by the primary light source and transmitted through the retroreflective material toward vehicles approaching the intersection from one or more directions.
  • this embodiment may also facilitate illumination of the retroreflective material by the light waves emitted by the headlights of vehicles approaching the pedestrian crossing from one or more directions.
  • the installation and position of the internally illuminated retroreflective device as a pedestrian crossing beacon may also allow light from the primary and/or an auxiliary light source to shine directly onto the pedestrian crossing through a secondary clear, non-reflective portion of the housing.
  • Additional exemplary uses of the internally illuminated retroreflective device of the present application include use of the device in any other retroreflective road sign including, but not limited to, all internationally or nationally recognized signs, including keep left/right arrows, regulatory signs, street name signs, guide signs, railway crossing signs, and the like.

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  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Road Signs Or Road Markings (AREA)

Abstract

La présente invention concerne diverses formes de réalisation d'un dispositif rétroréfléchissant à éclairage interne qui peut, par exemple, être utilisé au niveau d'un passage pour piétons. Dans une forme de réalisation de la présente invention, un dispositif rétroréfléchissant à éclairage interne (100) comprend (1) une première source de lumière (124) qui émet une lumière et qui est positionnée dans un boîtier (104) et un matériau rétroréfléchissant (114) positionné adjacent au boîtier (104) de sorte que la lumière émise par la première source de lumière (124) traverse le boîtier (104) et la matériau rétroréfléchissant (114). Dans une autre forme de réalisation de la présente invention, on utilise un disque (112) comprenant un matériau polymère à transmission optique (116) fixé sur un matériau rétroréfléchissant (114). Le disque (112) peut être fixé à un dispositif rétroréfléchissant à éclairage interne qui comprend (1) un boîtier (104) et (2) une source de lumière (124) positionnée dans le boîtier (104).
EP06838707A 2005-12-02 2006-12-01 Dispositif retroreflechissant a eclairage interne Withdrawn EP1954980A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ54396305A NZ543963A (en) 2005-12-02 2005-12-02 Retroreflective device
PCT/US2006/045885 WO2007064817A1 (fr) 2005-12-02 2006-12-01 Dispositif retroreflechissant a eclairage interne

Publications (2)

Publication Number Publication Date
EP1954980A1 true EP1954980A1 (fr) 2008-08-13
EP1954980A4 EP1954980A4 (fr) 2008-12-03

Family

ID=38092584

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06838707A Withdrawn EP1954980A4 (fr) 2005-12-02 2006-12-01 Dispositif retroreflechissant a eclairage interne

Country Status (4)

Country Link
EP (1) EP1954980A4 (fr)
AU (1) AU2006320505A1 (fr)
NZ (1) NZ543963A (fr)
WO (1) WO2007064817A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0333502A2 (fr) * 1988-03-18 1989-09-20 Minnesota Mining And Manufacturing Company Signe rétro-réfléchissante illuminée à l'intérieur
EP1542197A1 (fr) * 2002-07-08 2005-06-15 Nippon Carbide Kogyo Kabushiki Kaisha Panneau indicateur a eclairage interieur
EP1550991A1 (fr) * 2002-10-08 2005-07-06 Nippon Carbide Kogyo Kabushiki Kaisha Dispositif d'affichage a reflexion recursive

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0333502A2 (fr) * 1988-03-18 1989-09-20 Minnesota Mining And Manufacturing Company Signe rétro-réfléchissante illuminée à l'intérieur
EP1542197A1 (fr) * 2002-07-08 2005-06-15 Nippon Carbide Kogyo Kabushiki Kaisha Panneau indicateur a eclairage interieur
EP1550991A1 (fr) * 2002-10-08 2005-07-06 Nippon Carbide Kogyo Kabushiki Kaisha Dispositif d'affichage a reflexion recursive

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2007064817A1 *

Also Published As

Publication number Publication date
EP1954980A4 (fr) 2008-12-03
AU2006320505A1 (en) 2007-06-07
NZ543963A (en) 2008-12-24
WO2007064817A1 (fr) 2007-06-07

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