GB623588A - Manufacture of moulds for optical screens and reflecting signs - Google Patents

Manufacture of moulds for optical screens and reflecting signs

Info

Publication number
GB623588A
GB623588A GB38069/46A GB3806946A GB623588A GB 623588 A GB623588 A GB 623588A GB 38069/46 A GB38069/46 A GB 38069/46A GB 3806946 A GB3806946 A GB 3806946A GB 623588 A GB623588 A GB 623588A
Authority
GB
United Kingdom
Prior art keywords
moulds
cavities
manufacture
reflecting signs
group xxii
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
GB38069/46A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB623588A publication Critical patent/GB623588A/en
Expired 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/20—Making tools by operations not covered by a single other subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/00278—Lenticular sheets

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Ophthalmology & Optometry (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Abstract

623,588. Moulds. LUCE, R. W. Dec. 30, 1946, No. 38059. Convention date, March 6, 1945. [Class .87 (ii)] [Also in Group XXII] Moulds for casting television screens, reflecting signs &c. from thermoplastics or vitreous materials, have a plurality of cavities 30 therein, each cavity having a curved smooth surface made by impressing into a metal piate an implement having the desired curvature and surface characteristics (see Group XXII). Balls of one thirty-second of an inch diameter or less are used to form cavities constituting a 90 degree sector of a sphere and spaced for example at a distance of 0.005 of an inch apart. In a modification the cavities are elongated in the horizontal direction by spacing the holes a greater distance in one direction than in the other.
GB38069/46A 1945-03-06 1946-12-30 Manufacture of moulds for optical screens and reflecting signs Expired GB623588A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US623588XA 1945-03-06 1945-03-06

Publications (1)

Publication Number Publication Date
GB623588A true GB623588A (en) 1949-05-19

Family

ID=22041944

Family Applications (1)

Application Number Title Priority Date Filing Date
GB38069/46A Expired GB623588A (en) 1945-03-06 1946-12-30 Manufacture of moulds for optical screens and reflecting signs

Country Status (3)

Country Link
CH (1) CH261701A (en)
DE (1) DE847545C (en)
GB (1) GB623588A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2347379A (en) * 1999-01-22 2000-09-06 Sony Corp Moulding an optical element
GB2365815A (en) * 1999-01-22 2002-02-27 Sony Corp Optical element and its manufacture
US6552863B1 (en) 1999-01-22 2003-04-22 Sony Corporation Optical element, its manufacturing method and optical element manufacture metal die

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3709022A (en) * 1970-10-22 1973-01-09 Polaroid Corp Method and apparatus for fabricating imaging means

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2347379A (en) * 1999-01-22 2000-09-06 Sony Corp Moulding an optical element
SG81348A1 (en) * 1999-01-22 2001-06-19 Sony Corp Optical element, its manufacturing method and optical element manufacturing metal die
GB2365815A (en) * 1999-01-22 2002-02-27 Sony Corp Optical element and its manufacture
GB2347379B (en) * 1999-01-22 2002-10-30 Sony Corp Optical element and its manufacture
GB2365815B (en) * 1999-01-22 2002-10-30 Sony Corp Manufacture of optical elements
US6552863B1 (en) 1999-01-22 2003-04-22 Sony Corporation Optical element, its manufacturing method and optical element manufacture metal die
US6721097B2 (en) 1999-01-22 2004-04-13 Sony Corporation Optical element, its manufacturing method and optical element manufacturing metal die

Also Published As

Publication number Publication date
DE847545C (en) 1952-08-25
CH261701A (en) 1949-05-31

Similar Documents

Publication Publication Date Title
CH306004A (en) Manufacturing process of engraved glass objects.
IT1035227B (en) PROCESS FOR THE PRODUCTION OF OPTALMIC GLASS LENSES COATED WITH AN IMPACT RESISTANT GLASS FLAP AND OBTAINED PRODUCT
GB623588A (en) Manufacture of moulds for optical screens and reflecting signs
GB624772A (en) Improvements in projection screen
FR1113146A (en) Improvements in the manufacture of flat glass in ribbon form
CH313673A (en) Device with deflection controlled electron beam
CH289620A (en) Process for the manufacture of molded colored glass objects and stirring equipment for its implementation.
FR1042166A (en) Process for manufacturing objects with Braille characters, and objects made using this process
CA472441A (en) Primed hardboard and processes of producing the same
CH300506A (en) Process for manufacturing parts made of agglomerated materials, in particular based on binders and fibers.
CH284754A (en) Machine for the manufacture of hollow glass objects.
FR1062350A (en) Products based on glass fibers incorporated in hydraulic binders, cements and various aggregates. processes for obtaining said products and high-throughput machines intended for their manufacture
BE796845A (en) Glass microspheres - made by melting particles with a laser beam and solidifying them in free fall
AU163190B2 (en) Method for improving the tilth of surface soils, copolymeric compositions for such purpose, and method of producing copolymers for such purpose
AU164809B2 (en) Improvements in or relating tothe manufacture of fibre forming grafted acrylonitrile polymers
FR1158234A (en) Process for producing products formed from fibers, having good strength and elongation characteristics, high surface hardness and, at the edges, good elasticity and compressibility
CA457696A (en) Elastic polymer and method of producing the same
FAHMY et al. Semi-conduction and electron hopping in vitreous systems- Magnetic properties, micro-structure, and ultra-structure of partially crystallised B 2 O 3-BaO-Fe 2 O 3 glass Annual technical report, 1 Jan. 1970- 1 Jan. 1971(Magnetic properties, microstructure, and physical properties of partially crystallized glass)
CA752311A (en) Method of producing smooth, precision formed surfaces on bodies of vitreous material
AU962552A (en) Method for improving the tilth of surface soils, copolymeric compositions for such purpose, and method of producing copolymers for such purpose
AU757652A (en) Improvements in or relating tothe manufacture of fibre forming grafted acrylonitrile polymers
AU1169852A (en) Glass filaments coated with resinous material and process for producing thesame
FR1065474A (en) Improvements in the production of streptokinase and streptodornase by fermentation
FR899914A (en) Process for the mechanical manufacture of ampoules having a narrowed neck and an adjoining funnel-shaped enlargement
AU3619250A (en) 3,4-dimethyl-5-phenyl-2-iminothiazolidine, its optically active isomeres and process of producing the same