FIBRE OPTICS LIGHTING SYSTEM

Abstract: A fibre optics lighting system (10) comprises a panel (12) for receiving tail end portions of optical fibres (30) in a predetermined configuration so that, when light is transmitted through the fibres (30), the configuration is indicated at the panel (12). The fibres (30) may be encapsulated in another panel (13) which may be united with the first panel (12).

Description: Fibre Optics Lighting System This invention relates to a fibre optics lighting system. It is known to use optical fibres for providing illuminated- displays. Generally, a frame is constructed for supporting tail end portions of the optical fibres in a predetermined configuration and a bush containing receptor end portions of the fibres is located on the frame adjacent a light source so that, when receptor ends of the fibres are exposed to the light source, light is transmitted through the fibres to tail ends thereof whereby the configuration is indicated by the illuminated tail ends of -the fibres. While such an arrangement may be satisfactory for special displays, the construction of a frame and assembly of the optical fibres on the frame is time consuming and is not suited to large scale production. According to the present invention, there is a provided a fibre optics lighting system which is characterized in that there is provided a panel adapted to receive tail end portions of optical fibres in a predetermined configuration so that, when light is transmitted through the fibres to the tail ends thereof, the configuration is indicated at the panel. In this manner, panels may be produced in large quantities each adapted to receive the tail end portions of optical fibres in a predetermined configuration and assembly of the system is effected merely by inserting the tail end portions of the fibres into the panel. A further problem associated with optical fibres is that, in use, the fibres are unsupported between the tail end portions and the receptor end portions thereof. The ■ invention is further characte ized in that the portions of the fibres intermediate the tail end portions and the receptor end portions thereof are encapsulated in a support. In this manner, the fibres are protected and supported between the tail end portions and the receptor end portions thereof. Following is a description, by way of example only and with reference to the accompanying drawings, of one method of carrying the invention into effect. In the drawings : - Figure 1 is an elevation of one embodiment of a fibre optics lighting system in accordance with the present invention, Figure 2 is a diagrammatic cross section on the line A-A of Figure 1 shown of enlarged depth from front to rear for illustrative purposes. Figure 3 is a diagrammatic representation of a stage during manufacture of a support of a fibre optics lighting system in accordance with the present invention. Figure 4 is a diagrammatic representation showing assembly of the support. Figure 5 is a diagrammatic cross section of another embodiment of a fibre optics lighting system in accordance with the present invention, Figure 6 is an underneath plan view of an array of complementary panels for use in the embodiment shown in Figure 5, each panel having a configura ion of apertures containing lenses. Figure 7 is a diagrammatic plan view of an array of prisms and associated optical fibres of the embodiment shown in Figure 5, Figure 8 is a diagrammatic cross section showing an alternative reflector for use in the embodiment shown in Figure 5 in substitution for the prisms. Figure 9 is an underneath plan view of an array of complementary panels for use in the embodiment shown in Figure 5, each panel having a configuration of apertures containing lenses which configuration is different fro the configuration of the apertures shown in Figure 5, Figure 10 is an underneath plan view of an array of complementary panels- for use in the embodiment shown in Figure 5, each panel having a configuration of apertures containing lenses which configuration is different from the configuration of apertures shown in Figures 5 and 9, and Figure 11 is an underneath plan view of an array of complementary panels for use in the embodiment shown in Figure 5, each panel having a configuration of apertures containing lenses which configuration is different from the configuration of apertures shown in Figures 5,9 and 10. Referring now to Figures 1 and 2 of the drawings, there is shown a rectangular sign 10 for ' installation at the rear of a commercial vehicle. The sign comprises a laminate of three panels 11,12 and 13 of rectangular plastics material of equal area, the panel 11 comprising a front panel of the sign, the panel 13 comprising a rear panel of the sign and the panel 12 0 being an intermediate panel sandwiched between the front panel 11 and the rear panel 13. A front surface 14 of the intermediate panel 12 is coloured red in a transversely extending band 15 5 defined by a plurality of spaced rectangles and the remaining diagonally opposed triangular areas 16,17 of the surface 14 are coloured yellow, the yellow pigment being spaced from the adjacent margins of the red band 15. ' The surface 14 is provided with a lacquer so as to 0 reflect light incident thereon and the lacquer and/or the red and yellow pigments have characteristics such that they are luminous. The intermediate.panel 12 is provided with a plurality of recesses 18 extending in a series longitudinally of a margin of the red band 15 25 and an adjacent the yellow triangular area 16, each recess 18 diverging outwardly from a base 19 towards the surface 14. The intermediate panel 12 is provided with a plurality of bores 20 each being in communication with a corresponding one of the recesses 3018 through the base 19 thereof. A rear surface 21 of the intermediate panel 12 is recessed, as shown at 22. The front panel 11 is of substantially less thickness than the intermediate panel 12 and is transparent to 35 light. A rear surface 23 of the front panel 11 is provided with a series of concave dimples forming lenses 24, each being located adjacent a corresponding one of the recesses 18. The rear panel 13 also is of less thickness than the intermediate panel 12 but is of greater thickness than the front panel 11. The rear panel 13 is provided with a front surface 25 which is stepped as shown at 26 and is of such dimension as to complement the recess 22 of the rear surface 21 of the intermediate panel 12. The rear panel 13 is provided with a plurality of channels 27 arranged such that, when the rear panel 13 is united with the intermediate panel 12, the channels 27 extend from cor espon ing recesses 18 to a common aperture 28 located in a side wall 29 of the rear panel 13. Prior to assembly with the intermediate panel 12, the channels 27 have threaded therethrough optical fibres 30 arranged such that tail end portions 31 thereof extend outwardly from the front surface 25 of the rear panel 13. Receptor end portions (not shown) of the fibres 30 are contained in a bush (not shown) which is located adjacent the aperture 28 of the side wall 29 of the rear panel 13. * The rear panel 13 then is located adjacent the intermediate panel 12 so that the tail end portions 31 of the optical fibres 30 are received in corresponding bores 20 of the intermediate panel 12. The rear panel 13 then is moved into abutment with the intermediate panel 12 so that the stepped portion 26 of the rear panel 13 is received in the recess 22 of the intermediate panel 12 and the rear panel 13 and intermediate panel 12 thereby are located with respect one to another. The front panel 11 then is united with the front surface 14 of the intermediate panel 12 by suitable means, such as a bonding solution. Final assembly of the sign 10 is completed when a housing 32 containing a light source 33, such as a helogen bulb, is secured to the side wall 29 of the rear panel 13 such that the light source 33 is adjacent the receptor end portions of the fibres 30. The sign 10 is secured to a rear of the vehicle and the lamp 33 is connected in circuit with an ignition system of the vehicle. In this manner, the lamp 33 will be illuminated while an engine of the vehicle is operating and, in consequence, each of the lenses 24 will be illuminated by corresponding optical fibres 30 thereby providing an illuminated array on the sign 10 extending longitudinally of a margin between the red band and an adjacent yellow triangular area 16. It will be appreciated that further lenses 24 and cor respond ing opt ical f ibres 30 may be prov ided adj acent the marg in between the red band 15 and the other yellow tr iangular area 17 or , indeed , in any other conf iguration, the receptor end portions of the fibres 30 being located adjacent the light source 30. It will also be appreciated that the rear panel 13 may be moulded to the intermed iate panel 12. Pr ior to mould ing , however , the tail end portions 31 of the opt ical fibres 30 w ill be inserted in correspond ing bor e s 20 o f the inte rmed iate pane l 12 a nd the intermediate panel 12 then would be placed in a mould. A there o-setting plastics mater ial then would be poured into the mould and would subsequently be cured to form a r igid rear panel 13 containing the optical fibres 30. The fibres 30 would thus be encapsulated in the panel 13. It will be appreciated that the optical fibres 30 may be encapsulated in the rear panel 13 as a separate unit. Such encapsulation would be achieved by arranging the optical fibres 30 in a predetermined configuration in a mould and pouring a ther o-setting plastics material into the mould and subsequenting curing the material to form a rigid rear panel 13 containing the optical fibres 30, the tail end portions 31 extending from the front surface 25 of the rear panel 13 and the receptor end portions of the optical fibres 30 extending from the side wall 29 of the rear panel 13. In Figure 3 of the drawings, there is shown,* in diagrammatic form, a process for encapsulating optical fibres 34. Encapsulation is carried out by means of a mould 35 comprising a base 36 and a peripheral wall 37 upstanding from the base 36. Extending throughout the length of the wall 37 adjacent the base 36 is a bead 38. The base 36 is provided with apertures 39 arranged in a predetermined configuration. The optical fibres 34 are located in the mould 35 and tail end portions of the fibres 34 are inserted through corresponding apertures 39, as indicted by the arrow B in Figure 3. Receptor end portions of the optical fibres 34 extend through an aperture (not shown) in the peripheral wall 37. A thermo-setting plastics material, such as polyurethane or other plastics foam material, is poured into the mould 35 and subsequently is cured to form a rigid panel 40 containing the optical fibres 34 encapsulated therein. Referring now to Figures 4 to 7, there is shown a plurality of ceiling panels 41 for co-operating one with another to form a suspended ceiling of a building. Each of the panels 41 is rectangular and has an arcuate cut-out portion 42 at one corner thereof. Each panel -41 also is provided with plurality of apertures 43 each being equi-distant from an adjacent aperture 43 so as to comprise rows and columns of apertures 43 extending parallel to side edges of the panels 41. The arcuate cut-outs 42 are arranged such that, when four panels 41 are located adjacent one another edge to edge such that surfaces thereof extending transverse to longitudinal bores of the apertures 43 are contained in common planes, the cut-out portions 42 combine to form an aperture 44. Each of the ^ apertures 43 has received therein a corresponding one of a plurality of lens holders 45 each having a cylindrical portion 46, a conical portion 47 extending axially and diverging outwardly from the cylindrical portion 46 and a circumferential flange 48 remote from the cylindrical portion 46. Each lens holder 45 has retained therein by means of the flange 48 a lens 49. The dimensions of the lens holders 45 are such that each lens holder 45 ma be inserted, with the cylindrical portion 46 leading, into a corresponding aperture 43 of a panel 41 and will be retained therein by interference fit, the flange 48 thereof engaging an outer surface of the panel 41, as shown in Figure 5. Associated with each of the panels 41 is a corresponding one of a plurality of prisms 50. Each prism 50 comprises an upper surface 51, a lower surface 52 extending substantially parallel to the surface 51, an inner downwardly sloping surface 53, sidewalls 54,55, a curved outer surface 56 and a protuberance 57 extending radially outwardly of the outer surface 56. The side walls 54,55 are contained in planes which converge radially inwardly of the outer surface 53. The protuberance 57 has a lower arcuate surface 58 5 which extends downwardly and inwardly towards the lower surface 52. Each prism 50 is provided with a substantially right-angled indentation 59 rearwardly of each corresponding side wall 54,55. Also, each prism 50 is provided with apertures 60 in each protuberance 10 57 whereby each prism 50 may be secured to a corresponding ceiling panel 41 by means of pins 61 inserted in corresponding apertures 60. Each of the protuberances 57 is provided with a recess 1562 for receiving a corresponding one of a plurality of bushes 63 of harnesses of optical fibres 64, receptor end portions of the optical fibres 64 being received in the corresponding bushes 63. Tail end portions 65 of the fibres 64 are inserted in cylindrical portions 46 20 of corresponding lens holders 45, as shown in Figure 5. The arrangement is such that a light source 66 having four depending legs 67 can be mounted on the prisms 50 of an array of four ceiling panels 41 by inserting 25 lower end portions of the legs 67 into recesses 68 formed by pairs of adjacent indentations 59 of the prisms 50, as shown in Figure 7, downward movement of the legs 67 being restricted by outwardlyy extending flanges 69 of the legs 67. 30 The arrangement is such that l ight d irected from a centr al por t ion o f the l ight source 66 pas se s downwardly through an aperture 44 formed by the inner s ur f aces 53 of the pr i sms 50 but l ight d ir ected 35 downwardly from the l ight source 66 on to the upper sur faces 51 of the pr i sms 50 will be reflected by the inner sur.faces 53 to the receptor ends of the optical fibres 64. Light received by the receptor ends of the fibres 64 will be transmitted therealong to the tail ends thereof and will be emitted through the lenses 49. In this manner, light directed downwardly from the light source 66 through an aperture 44 formed by the inner surfaces 53 of the prisms 50 will be augmented by light emitted from the optical fibres 64 through the lenses 49 provided at a plurality of locations on the panels 41. It will be appreciated that the optical fibres 64 may be encapsulated in a panel '70 (see Figure 4) which may also' incorporate the protuberances 57 of the prisms 50. The tail end portions 65 of the optical fibres 64 would project downwardly from the panel 70 and, during manufacture, would be inserted in the cylindrical portions 46 of corresponding lens holders 45, as shown in Figure 4. Each ceiling panel 41 would be provided with a stepped peripheral wall 71 which would be complementary to a stepped wall 72 of the panel 70. It will be appreciated that reflection of light from the light source 66 may be achieved by means other than the prisms 50. For example, four panels 41 may be united at adjacent cut-out portions 42 thereof by means of a conical reflecting surface 73 having a radially outwardly extending circumferential flange 74 for attachment to upper surface of the ceiling panels 41. It will also be appreciated that the ceiling panels 41 may be provided with the apertures 43 in a configuration different from that shown in Figure 6. Examples of alternative configurations are shown in Figures 9,10 and 11. Furthermore, it will be appreciated that the ceiling panels 41 need not necessarily be provided with corner cut-out portions 42. Instead, a configuration may be provided whereby receptor end portions of the optical fibres 64 are located below a light source at any location above the or each panel 41.

Claims: CLAIMS 1. A fibre optics lighting system comprising a plurality of optical fibres (30,64) each having a tail end portion and receptor end portion and means (13,70) for supporting the fibres (30,64) so that, when the receptor ends of the fibres (30,64) are exposed to a light source (33,66) light is transmitted through the fibres (30,64) to tail ends thereof characterized in that there is provided a panel (11, 41) adapted to receive the tail end portions of the fibres (30,64) in a predetermined configuration so that, when light is transmitted through the fibres (30,64) to the tail end portions thereof, the configuration is indicated at the panel (11,41). ' 2. A system as claimed in Claim 1 characterize in that the portions of the fibres (30,64) intermediate the tail end portions and the receptor end portions thereof are encapsulated in the support means (13,70). 3. A system as claimed in Claim 2 characterized in that the support means (13,70) comprises a sheet. 4. A system as claimed in Claim 3 characterized in that the sheet (13,70) and the panel (11,41) unite one with another. 5. A system as claimed in any one of the preceding claims characterized in that there is provided a plurality of lenses (49) each associated with a corresponding one of the tail end portions of the fibres (30,64). 6. A system as claimed in Claim 5 characterized in that there is provided a plurality of lens supports (45) each for supporting a corresponding one of the lenses (49) . 7. A system as claimed in Claim 5 characterized in that the lenses (24) are formed integrally in a lens panel (11). 0 8. A system as claimed in any one of the preceding claims characterized in that there is provided a light reflection surface (53,73) for reflecting light from the light source (33,66) to the receptor ends of the fibres (64). 5 9. A system as claimed in Claim 8 characterized in that the the surface (53) is contained in a prism (50). 20 10. A system as claimed in Claim 9 characterized in that the prism (50) is adapted to receive a receptor (63) containing receptor end portions of the fibres (64).

Inventors: BUTTS PETER RALPH, BUTTS, PETER, RALPH
Applicants: BUTTS PETER RALPH, BUTTS, PETER, RALPH
Application year: 1986
Main classification: G09F9
IPC codes: G02B6, G09F9