GB679426A - Improvements in or relating to methods of manufacturing optical elements - Google Patents

Improvements in or relating to methods of manufacturing optical elements

Info

Publication number
GB679426A
GB679426A GB23102/50A GB2310250A GB679426A GB 679426 A GB679426 A GB 679426A GB 23102/50 A GB23102/50 A GB 23102/50A GB 2310250 A GB2310250 A GB 2310250A GB 679426 A GB679426 A GB 679426A
Authority
GB
United Kingdom
Prior art keywords
coating
mould
substratum
optical elements
sept
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
GB23102/50A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries Ltd
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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB679426A publication Critical patent/GB679426A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • B29D11/00019—Production of simple or compound lenses with non-spherical faces, e.g. toric faces

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Ophthalmology & Optometry (AREA)
  • Mechanical Engineering (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Surface Treatment Of Optical Elements (AREA)

Abstract

679,426. Optical elements. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Sept. 20, 1950 [Sept. 23, 1949], No. 23102/50. Class 97 (i). [Also in Group V] A method of manufacturing optical elements in which a coating of a material which is gelatinizable by reducing the' temperature is cast in a mould on a substratum substantially to prevent lateral contraction of the casting during manufacture, is gelatinized, removed from the mould and dried, the mould being profiled such that the free surface of the coating is aspherical, is characterized in that the cast coating consists of water-insoluble material dissolved in an organic liquid. Suitable materials are celluloseacetate-butyrate or cellulose-acetato-propionate dissolved in a mixture of toluene, xylene and isopropanol. Softening agents such as tricresyl phosphate may be added to change the refractive index of the coating. Fig. 3 shows a mould 3 shaped to produce an aspherical correcting plate for a Schmidt system, ducts 4 and 5 allowing heating or cooling liquid to be supplied and a duct 6 admitting the material 7 as described in Specifications 614,255 and 626,530. The substratum 2 may be of glass or transparent plastic and the final elements may consist of the dried coating and substratum or the coating may be used separately. In a mirror a metallic reflecting layer may be provided between the coating and the substratum.
GB23102/50A 1949-09-23 1950-09-20 Improvements in or relating to methods of manufacturing optical elements Expired GB679426A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL679426X 1949-09-23

Publications (1)

Publication Number Publication Date
GB679426A true GB679426A (en) 1952-09-17

Family

ID=19802387

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23102/50A Expired GB679426A (en) 1949-09-23 1950-09-20 Improvements in or relating to methods of manufacturing optical elements

Country Status (1)

Country Link
GB (1) GB679426A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1185394B (en) * 1962-08-10 1965-01-14 Albert Schacht Fa Short periscope

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1185394B (en) * 1962-08-10 1965-01-14 Albert Schacht Fa Short periscope

Similar Documents

Publication Publication Date Title
CH306004A (en) Manufacturing process of engraved glass objects.
GB1533622A (en) Fluid-cooled moulding devices
US2482698A (en) Optical lens means having a nonspherical refracting surface
MX9304682A (en) PROCEDURE FOR MANUFACTURING HYDROGEL LENSES CONTAINING SILICONE.
NO942691L (en) Method and apparatus for making molds as well as moldings made according to the method
IT1035227B (en) PROCESS FOR THE PRODUCTION OF OPTALMIC GLASS LENSES COATED WITH AN IMPACT RESISTANT GLASS FLAP AND OBTAINED PRODUCT
AU499877B2 (en) Production of glass articles with desired refractive index distribution
GB679426A (en) Improvements in or relating to methods of manufacturing optical elements
JPS5214600A (en) Process for the production of a thin film of silicon carbide
GB809879A (en) Method and apparatus for heating glass sheets
GB508295A (en) Improvements in and relating to methods of and apparatus for casting vitreous articles
GB550645A (en) Improvements in or relating to optical elements
GB1224365A (en) Surfacing unit.
GB805863A (en) A cooling system for a glass forming mould
GB577467A (en) Improved method of and apparatus for moulding articles, particularly lenses, from thermoplastic materials
JPS6461328A (en) Glass lens and device for forming thereof
GB675492A (en) Improvements in or relating to optical elements having a non-spherical refracting surface
GB604665A (en) Optical interference coatings
CA489228A (en) Mold for blowing glass and method therefor
GB583091A (en) Improvements in or relating to the manufacture of spectacle lenses from plastic materials such as polymerized methyl methacrylate or polystyrene
GB575098A (en) Process and devices for the manufacture of articles in fused silica
GB695297A (en) Improvements in microscope objectives
KR790000731B1 (en) Method of moulding and tempering glass articles
AU160489B2 (en) Glass filaments coated with resinous material and process for producing thesame
AU117354A (en) Glassware forming machine with block type or one-piece molds