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GB1139280A - Manufacture of optical elements - Google Patents

Manufacture of optical elements

Info

Publication number
GB1139280A
GB1139280A GB5264067A GB5264067A GB1139280A GB 1139280 A GB1139280 A GB 1139280A GB 5264067 A GB5264067 A GB 5264067A GB 5264067 A GB5264067 A GB 5264067A GB 1139280 A GB1139280 A GB 1139280A
Authority
GB
United Kingdom
Prior art keywords
powder
blanks
optical elements
pressing
moulding
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
GB5264067A
Inventor
Richard Edwin Clark
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak 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 Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of GB1139280A publication Critical patent/GB1139280A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B40/00—Preventing adhesion between glass and glass or between glass and the means used to shape it, hold it or support it
    • C03B40/02—Preventing adhesion between glass and glass or between glass and the means used to shape it, hold it or support it by lubrication; Use of materials as release or lubricating compositions
    • C03B40/033—Means for preventing adhesion between glass and glass
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/547—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on sulfides or selenides or tellurides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/64—Burning or sintering processes
    • C04B35/645—Pressure sintering
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/02—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of crystals, e.g. rock-salt, semi-conductors

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Structural Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Inorganic Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

1,139,280. Moulding optical elements. EASTMAN KODAK CO. 20 Nov., 1967 [22 Nov., 1966], No. 52640/67. Heading B5A. [Also in Division C1] A plurality of optical elements are made from a microcrystalline inorganic powder by forming the powder into a stack of loosely compacted blanks with a non-compatible separator between each blank and heating and pressing the blanks until the material has a density of at least 99% of theoretical. The blanks are preferably formed by cold pressing, and may be made outside the mould or by placing a layer of powder 17 in the mould cavity, pressing, placing a spacer 19 upon the powder, adding more powder and pressing to form the next blank, thereby building a stack of alternating blanks and spacers. The spacers may be discrete sheets, foils of metal inert under the reaction conditions or a layer of colloidal graphite formed on the blanks before insertion in the mould cavity. The moulding pressure is preferably at least 9,500 p.s.i. and the temperature at least 932‹ F., the moulding being carried out in vacuo, and cooling in the presence of a noble gas, preferably argon. The optical elements may be flat discs or domes. Suitable inorganic materials are fluorides of calcium, lithium, lanthanum or strontium, zinc sulphide, oxide or selenide, cadmium sulphide, selenide or telluride, magnesium oxide, titanium dioxide and calcium telluride.
GB5264067A 1966-11-22 1967-11-20 Manufacture of optical elements Expired GB1139280A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US59623066A 1966-11-22 1966-11-22

Publications (1)

Publication Number Publication Date
GB1139280A true GB1139280A (en) 1969-01-08

Family

ID=24386499

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5264067A Expired GB1139280A (en) 1966-11-22 1967-11-20 Manufacture of optical elements

Country Status (1)

Country Link
GB (1) GB1139280A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4944900A (en) * 1983-03-16 1990-07-31 Raytheon Company Polycrystalline zinc sulfide and zinc selenide articles having improved optical quality
US5126081A (en) * 1980-12-29 1992-06-30 Raytheon Company Polycrystalline zinc sulfide and zinc selenide articles having improved optical quality
WO2008075296A2 (en) * 2006-12-20 2008-06-26 Koninklijke Philips Electronics N.V. Hot axial pressing method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5126081A (en) * 1980-12-29 1992-06-30 Raytheon Company Polycrystalline zinc sulfide and zinc selenide articles having improved optical quality
US4944900A (en) * 1983-03-16 1990-07-31 Raytheon Company Polycrystalline zinc sulfide and zinc selenide articles having improved optical quality
WO2008075296A2 (en) * 2006-12-20 2008-06-26 Koninklijke Philips Electronics N.V. Hot axial pressing method
WO2008075296A3 (en) * 2006-12-20 2008-08-14 Koninkl Philips Electronics Nv Hot axial pressing method
US8221664B2 (en) 2006-12-20 2012-07-17 Koninklijke Philips Electronics N.V. Hot axial pressing method
CN101573309B (en) * 2006-12-20 2013-05-29 皇家飞利浦电子股份有限公司 Axial hot pressing method

Also Published As

Publication number Publication date
DE1596429B2 (en) 1972-06-29
DE1596429A1 (en) 1970-08-13

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