GB1011779A - Improvements in or relating the manufacture of optical elements - Google Patents

Improvements in or relating the manufacture of optical elements

Info

Publication number
GB1011779A
GB1011779A GB3636362A GB3636362A GB1011779A GB 1011779 A GB1011779 A GB 1011779A GB 3636362 A GB3636362 A GB 3636362A GB 3636362 A GB3636362 A GB 3636362A GB 1011779 A GB1011779 A GB 1011779A
Authority
GB
United Kingdom
Prior art keywords
mould
relating
manufacture
optical elements
pressure
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
GB3636362A
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 GB1011779A publication Critical patent/GB1011779A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
    • B01J3/06—Processes using ultra-high pressure, e.g. for the formation of diamonds; Apparatus therefor, e.g. moulds or dies
    • B01J3/062—Processes using ultra-high pressure, e.g. for the formation of diamonds; Apparatus therefor, e.g. moulds or dies characterised by the composition of the materials to be processed
    • 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

Abstract

An optical element is obtained by placing pure microcrystalline cadmium sulphide in a pressure mould, subjecting the material to 10,000-55,000 p.s.i. whilst maintaining its temperature at 510-800 DEG C. for such a period of time, normally 10-40 minutes, that a body being of at least 99% of the theoretical density of cadmium sulphide is formed, and thereafter releasing the pressure and cooling the mould. The process is preferably carried out in an inert atmosphere or a vacuum. A metallic mounting may be placed in the mould so that the element is formed in the mounting. The heating is preferably high-frequency heating. The product has a high refractive index and is a good transmitter of infra-red.
GB3636362A 1961-09-28 1962-09-25 Improvements in or relating the manufacture of optical elements Expired GB1011779A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US14142661A 1961-09-28 1961-09-28

Publications (1)

Publication Number Publication Date
GB1011779A true GB1011779A (en) 1965-12-01

Family

ID=22495637

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3636362A Expired GB1011779A (en) 1961-09-28 1962-09-25 Improvements in or relating the manufacture of optical elements

Country Status (4)

Country Link
CH (1) CH380888A (en)
DE (1) DE1467320B2 (en)
GB (1) GB1011779A (en)
SE (1) SE303387B (en)

Also Published As

Publication number Publication date
CH380888A (en) 1964-08-14
SE303387B (en) 1968-08-26
DE1467320A1 (en) 1969-11-06
DE1467320B2 (en) 1971-03-18

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