GB1081601A - Reflex reflecting sheets and articles - Google Patents

Reflex reflecting sheets and articles

Info

Publication number
GB1081601A
GB1081601A GB31856/64A GB3185664A GB1081601A GB 1081601 A GB1081601 A GB 1081601A GB 31856/64 A GB31856/64 A GB 31856/64A GB 3185664 A GB3185664 A GB 3185664A GB 1081601 A GB1081601 A GB 1081601A
Authority
GB
United Kingdom
Prior art keywords
beads
layer
refractive index
pressing operation
metal
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.)
Expired
Application number
GB31856/64A
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 Co
Original Assignee
Minnesota Mining and Manufacturing 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
Priority claimed from US300475A external-priority patent/US3292029A/en
Priority claimed from US381459A external-priority patent/US3413058A/en
Application filed by Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Publication of GB1081601A publication Critical patent/GB1081601A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/12—Reflex reflectors
    • G02B5/126—Reflex reflectors including curved refracting surface
    • G02B5/128—Reflex reflectors including curved refracting surface transparent spheres being embedded in matrix
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44F—SPECIAL DESIGNS OR PICTURES
    • B44F1/00—Designs or pictures characterised by special or unusual light effects
    • B44F1/02—Designs or pictures characterised by special or unusual light effects produced by reflected light, e.g. matt surfaces, lustrous surfaces
    • B44F1/04—Designs or pictures characterised by special or unusual light effects produced by reflected light, e.g. matt surfaces, lustrous surfaces after passage through surface layers, e.g. pictures with mirrors on the back
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24-F21S41/28

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Road Signs Or Road Markings (AREA)
  • Laminated Bodies (AREA)

Abstract

A reflex reflector comprises a monolayer of glass beads 11 of refractive index above 1.7 firmly partially embedded in at least one side of a layer of malleable and ductile metal 10 having a Knoop hardness less than the crushing stregth of the glass beads. The reflector is formed by <PICT:1081601/C1/1> <PICT:1081601/C1/2> pressing the beads into the metal under elevated temperature conditions. The beads are held in position on a second metal layer 13 by a temporary organic bonding material 12, the layer 13 being advanced towards the layer 10 to effect the pressing operation. The beaded surface produced is then washed free of the organic material 12. The layer 13 has a Knoop hardness greater than that of the layer 10 but less than the crushing strength of the glass beads so that it "grips" the beads during the pressing operation. The metal layer 10 is preferably aluminium but may be copper, lead, zinc, tin, gold, for example. Such metals as lead are made specularly reflecting by deposition thereon of a layer of aluminium. The soft metal layer 10 may be carried on an iron or steel sheet 14. Prior to the pressing operation a legend 15 of any desired shape may be coated on the reflecting face of the layer 10. The glass beads 11 will then trap the legend in position. In order to provide reflex reflection when the beads are exposed to either air or water, beads having a refractive index of 2.4 to 2.6 are mixed with beads having a refractive index of 1.8 to 2.0. In a further embodiment the exposed portions of the beads are covered with a layer of elastomer which is then cured at 150 DEG F. Also the beads may be initially coated with a silicate veneer.
GB31856/64A 1963-08-07 1964-08-05 Reflex reflecting sheets and articles Expired GB1081601A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US300475A US3292029A (en) 1963-08-07 1963-08-07 Sealed beam headlight with glassbeaded light reflecting shield
US381459A US3413058A (en) 1964-07-09 1964-07-09 Reflex-reflecting articles

Publications (1)

Publication Number Publication Date
GB1081601A true GB1081601A (en) 1967-08-31

Family

ID=26971804

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31856/64A Expired GB1081601A (en) 1963-08-07 1964-08-05 Reflex reflecting sheets and articles

Country Status (3)

Country Link
DE (1) DE1447072A1 (en)
DK (1) DK122870B (en)
GB (1) GB1081601A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0009253A1 (en) * 1978-09-21 1980-04-02 Alcan Research And Development Limited Retro-reflecting sheet material and method of manufacture

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19751012A1 (en) * 1997-11-18 1999-06-10 Fotoelektrik Pauly Gmbh Optical reflector with peripheral rim, light-permeable covering layer and reflector base

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0009253A1 (en) * 1978-09-21 1980-04-02 Alcan Research And Development Limited Retro-reflecting sheet material and method of manufacture
US4340273A (en) 1978-09-21 1982-07-20 Alcan Research & Development Limited Retro-reflecting sheet material

Also Published As

Publication number Publication date
DK122870B (en) 1972-04-24
DE1447072A1 (en) 1969-10-09

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