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    PHOTOSENSITIVE CRYSTALLIZED GLASS HAVING LOW EXPANSION COEFFICIENT
    3.
    发明专利
    PHOTOSENSITIVE CRYSTALLIZED GLASS HAVING LOW EXPANSION COEFFICIENT 失效

    公开(公告)号：JPS63166736A

    公开(公告)日：1988-07-09

    申请号：JP16450086

    申请日：1986-07-12

    Applicant: SUMITA OPTICAL GLASS

    Inventor： SAWANOBORI SHIGETO ,  YAMAUCHI JUNYA ,  NAGAHAMA SHINOBU

    IPC: C03C3/095 ,  C03C4/04 ,  C03C10/04

    Abstract: PURPOSE:To provide a crystallized glass composed of a specific glass composition, having high meltability of the glass and excellent chemical machinability, i.e. large crystallization temperature difference between a part irradiated with ultraviolet ray and a non-irradiated part and giving a crystallized final product having a specific thermal expansion coefficient. CONSTITUTION:The objective glass is composed of 55-70wt.% SiO2, 8-12% Li2O, 12-20% Al2O3, 0-3% Na2O, 2-5% K2O, 0-2% Cs2O, 1-3% BaO and 0-4% ZnO and containing 0.001-0.03% CeO2 and 0.05-0.1% Ag or 0.0005-0.02% Au as photosensitive components. The glass is sensitive to ultraviolet ray to effect the selective crystallization of the ultraviolet irradiated part by the heat-treatment at 500-600 deg.C. The crystallized product produced by the heat-treatment at 800-900 deg.C to precipitate fine crystals in the glass has a thermal expansion coefficient of 40-70X10 / deg.C.

    INFRARED RAY-TRANSMITTING GLASS
    4.
    发明专利
    INFRARED RAY-TRANSMITTING GLASS 失效

    公开(公告)号：JPH01294550A

    公开(公告)日：1989-11-28

    申请号：JP12537588

    申请日：1988-05-23

    Applicant: SUMITA OPTICAL GLASS

    Inventor： SAWANOBORI SHIGETO ,  YAMAUCHI JUNYA ,  BABA NOBUYOSHI ,  NAGAHAMA SHINOBU

    IPC: C03C3/32 ,  C03C4/10

    Abstract: PURPOSE:To provide the stable title glass capable of transmitting light from visible area to wide infrared ray area and having excellent infrared ray transmission by constituting a glass of ZrF4, BaCl2, LiF and NaF having a specific molar ratio. CONSTITUTION:The aimed infrared ray transmitting glass has a composition consisting of 35-65mol% ZrF4, 5-30mol% BaCl2, 5-30mol% LiF, 5-30mol% NaF and 10-60mol% total amount of LiF and NaF. Ionization tendency can be lessen by furthermore adding at least one kind selected from AlF3, GaF3, YF3, LaF3 and GdF3 to the above-mentioned composition at an amount of 1-15%. Stability can be further improved by moreover adding at least one kind selected from CaF2, SrF2 and BaF2 thereto at an amount of 3-30%. The resultant infrared ray-transmitting glass is useful as a lens, etc., used in infrared ray area.

    TRANSMISSION TYPE DIFFRACTION GRATING
    5.
    发明专利
    TRANSMISSION TYPE DIFFRACTION GRATING 失效

    公开(公告)号：JPH01173002A

    公开(公告)日：1989-07-07

    申请号：JP33378787

    申请日：1987-12-28

    Applicant: SUMITA OPTICAL GLASS

    Inventor： TAGAWA MASAFUMI ,  SAWANOBORI SHIGETO ,  YAMAUCHI JUNYA ,  MARUYAMA FUMIO

    IPC: G02B5/18 ,  C03C3/11 ,  C03C4/04

    Abstract: PURPOSE:To easily form a transmission type diffraction grating by placing alternately a transparent glass phase and an opaque crystal phase of a linear shape of a prescribed dimension in the inside of a photosensitive glass substrate. CONSTITUTION:A diffraction grating is manufactured by polishing the glass containing a photosensitive metal and in accordance with printing and developing processes of photosensitive glass, which are executed usually. That is, a mask pattern of prescribed line width and pitch interval consisting of a chrome vapor-deposited film is allowed to adhere closely to a photosensitive glass plate and ultraviolet rays are radiated by parallel rays using a high voltage mercury lamp. Thereafter, it is made parallel by polishing the deformation on the surface of glass, which has been generated by a heat treatment. As a result, a diffraction grating in which an opaque part 1 and a transparent part 2 which have been manufactured and crystallized in such a way are arrayed periodically is formed. Accordingly, the process which necessitates precision working scarcely exists, and said diffraction grating has an excellent productivity.

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