JPH06305769A - Optical glass - Google Patents

Optical glass

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Publication number
JPH06305769A
JPH06305769A JP11913293A JP11913293A JPH06305769A JP H06305769 A JPH06305769 A JP H06305769A JP 11913293 A JP11913293 A JP 11913293A JP 11913293 A JP11913293 A JP 11913293A JP H06305769 A JPH06305769 A JP H06305769A
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Prior art keywords
glass
optical glass
optical
range
present invention
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JP11913293A
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Japanese (ja)
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JP2875709B2 (en )
Inventor
Hisao Hatta
Koji Omori
八田比佐雄
浩二 大森
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Ohara Inc
株式会社オハラ
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    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00Glass compositions
    • C03C3/04Glass compositions containing silica
    • C03C3/062Glass compositions containing silica with less than 40% silica by weight
    • C03C3/064Glass compositions containing silica with less than 40% silica by weight containing boron
    • C03C3/068Glass compositions containing silica with less than 40% silica by weight containing boron containing rare earths

Abstract

PURPOSE: To produce optical glass having such optical constants as about 1.75-1.85 refractive idnex (Nd) and about 35-50 Abbe's number (νd) and having excellent chemical durability while improving press moldability.
CONSTITUTION: This optical glass contains, by weight, 6-15% SiO2, 15-24% B2O3, 25-50% La2O3, 0.1-10% Ta2O, 6-25% ZnO and 0.5-5% Li2O as principal components.
COPYRIGHT: (C)1994,JPO

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【産業上の利用分野】本発明は、基本的にSiO 2 −B 2 BACKGROUND OF THE INVENTION This invention is, basically SiO 2 -B 2
3 −La 23 −Ta 25 −ZnO−Li 2 O系からなり、屈折率(Nd)が約1.75〜1.85、アッベ数(νd)が約35〜50の範囲の光学恒数を有し、かつ低転移温度特性を付与してモールドプレス成形性を改善しつつ、化学的耐久性に優れた新規な光学ガラスに関する。 O 3 -La 2 O 3 consists -Ta 2 O 5 -ZnO-Li 2 O system, the refractive index (Nd) of about 1.75 to 1.85, an Abbe's number ([nu] d) in the range of about 35 to 50 having optical constants, and while improving mold press formability by giving a low transition temperature characteristic, about excellent novel optical glass chemical durability.

【0002】 [0002]

【従来の技術】従来、前記光学恒数を示すガラスは、硼酸ランタン系組成のものが代表的であり、例えば特開昭50−14712号および特開昭55−116641号等の公報にみられるように種々のガラスが開示されている。 Conventionally, glass indicating the number of the optical constants is of a borate lanthanum composition is typically found in publications such as, for example, JP 50-14712 and No. JP 55-116641 various glasses are disclosed as. しかしこれらのガラスは一般に転移温度(以下Tg However, these glasses are generally transition temperature (hereinafter Tg
という)が高く600℃を越えるため、近年要望されている光学素子直接成形用のモールドプレス性に優れたガラスとしては不適である。 For exceeding 600 ° C. higher) that, as a glass excellent in press molding of the optical element directly molding are desired in recent years is not suitable. 一般にTgの値は、ガラス熱間成形性の難易度を左右する大きな要因となっているが、軟化ガラスをプレス成形する場合、プレス金型はそのガラスのTg近傍にさらされるため、ガラスのTgが高いほど金型表面が酸化したり、金属組織に変化を生じ急速に劣化して金型寿命が短くなりやすい。 The value of Tg generally has become a major factor affecting the degree of difficulty of the glass hot formability, when press molding the softened glass, since the press die is exposed to near Tg of the glass, the glass Tg or mold surface is oxidized higher, rapidly die life becomes short easily degraded result in a change in the metal structure. そこで前記光学恒数を維持させながら、低Tg特性を与える目的で種々のガラスが開発されている。 So while maintaining the optical constants, various glasses for the purpose of providing a low Tg properties have been developed. 例えば特開昭60−2 For example, JP-A-60-2
21338号公報には、B 23 −La 23 −Y 23 −L The 21338 JP, B 2 O 3 -La 2 O 3 -Y 2 O 3 -L
2 O−R″O(R″は2価のアルカリ土類酸化物及び/又は2価の金属酸化物)系ガラスが開示されているが、このガラスは、耐失透性は改善されているものの化学的耐久性が十分でない。 i 2 O-R "O ( R" is a divalent alkaline earth oxides and / or divalent metal oxides) but based glass is disclosed, the glass, the devitrification resistance is improved It is not sufficient chemical durability of those who are.

【0003】 [0003]

【発明が解決しようとする課題】本発明は、前記従来のガラスにみられる諸欠点を改善し、屈折率(Nd)約1.75〜1.85、アッベ数(νd)約35〜50の範囲の光学恒数とモールドプレスに適合する低Tg特性を維持させつつ、一段と優れた化学的耐久性を有する光学ガラスを提供することを目的とする。 [0008] The present invention improves various drawbacks found in the conventional glass, the refractive index (Nd) of about 1.75 to 1.85, an Abbe's number ([nu] d) of about 35 to 50 while maintaining the scope low Tg properties compatible with optical constants and the mold press, and an object thereof is to provide an optical glass having more excellent chemical durability.

【0004】 [0004]

【課題を解決するための手段】上記目的を達成するため、本発明者等は鋭意試験研究を重ねた結果、従来には具体的に開示されていない特定組成範囲のSiO 2 −B 2 To achieve the above object, according to an aspect of the present invention have found a result of extensive research, SiO 2 of a specific composition range that is not specifically disclosed in the prior -B 2
3 −La 23 −Ta 25 −ZnO−Li 2 O系ガラスにおいて、前記所定の光学恒数とモールドプレスに適した低Tg特性を維持しつつ、ガラスの化学的耐久性を一段と改善した所期のガラスが得られることをみいだし、本発明をなすに至った。 In O 3 -La 2 O 3 -Ta 2 O 5 -ZnO-Li 2 O -based glass, while maintaining a low Tg characteristics suitable for the desired optical constants and molding press, further the chemical durability of the glass It discovered that improved desired glass is obtained, leading to completion of the present invention.

【0005】本発明にかかる光学ガラスの特徴は、重量%で、SiO 2 6〜15%、B 2 [0005] Features of the optical glass according to the present invention, in weight%, SiO 2 6~15%, B 2 O 3 15〜24%、 3 from 15 to 24 percent,
ただしSiO 2 +B 23 21〜35%、La 23 However SiO 2 + B 2 O 3 21~35 %, La 2 O 3 2
5〜50%、Gd 23 0〜30%、ただしLa 23 5~50%, Gd 2 O 3 0~30 %, except La 2 O 3 +
Gd 23 27〜60%、Ta 25 0.1〜10%、 Gd 2 O 3 27~60%, Ta 2 O 5 0.1~10%,
ZnO 6〜25%、ZrO 2 0〜10%、Nb 25 ZnO 6~25%, ZrO 2 0~10% , Nb 2 O 5
0〜15%、WO 3 0〜5%、Li 2 O 0.5〜5 0~15%, WO 3 0~5%, Li 2 O 0.5~5
%、Al 23 0〜10%、TiO 2 0〜3%の範囲の各成分を含有し、かつ屈折率(Nd)約1.75〜 %, Al 2 O 3 0~10% , and containing each ingredient in the range of TiO 2 0 to 3%, and a refractive index (Nd) of about 1.75
1.85、アッベ数(νd)約35〜50の範囲の光学恒数と、580℃以下のTgを有するところにある。 1.85, and the Abbe number ([nu] d) optical constants of about 35-50 range, there is to have a 580 ° C. below Tg.

【0006】つぎに各成分の含有量を上記のとおり限定した理由について述べる。 [0006] Next described why the content of each component is limited as described above. すなわち、SiO 2成分は、 That, SiO 2 component,
その量が6%未満であるとガラスの化学的耐久性が低下し、またその量が15%を超えると低Tg特性を維持し得なくなる。 The amount the chemical durability of the glass is less than 6% decrease, also the amount can not give maintaining low Tg properties and more than 15%. 23成分はガラスに低Tgを与えるのに有利なガラス形成成分であるが、その量はガラスの耐失透性と化学的耐久性維持のため、15〜24%とすべきである。 While B 2 O 3 component is an advantageous glass-forming components to provide a low Tg in the glass, the amount is for maintaining devitrification resistance and chemical durability of the glass, it should be 15 to 24% . ただし、SiO 2とB 23成分の合計量は、ガラスの耐失透性と目標の光学恒数維持のため21〜35 However, the total amount of SiO 2 and B 2 O 3 component, since the optical constants maintenance of the devitrification resistance and the target glass 21-35
%、好ましくは21〜30%の範囲とする。 %, Preferably in the range of 21-30%.

【0007】La 23成分はガラスの屈折率を目標の値にするため25%以上含有させる必要があるが、その量が50%を超えるとガラスは失透しやすくなる。 [0007] La 2 O 3 component it is necessary to contain at least 25% to the value of the target refractive index of the glass, the glass tends to be devitrified if its amount exceeds 50%. Gd 2 Gd 2
3成分はLa 23成分と同様の光学特性をガラスに与えるので添加し得るが、その量が30%を超えるとガラスは失透しやすくなる。 O 3 component is be added because it gives the same optical characteristics as the La 2 O 3 component in the glass, the glass tends to be devitrified if its amount exceeds 30%. ただし、La 23とGd 23成分の合計量は、目標の光学恒数と耐失透性維持のため2 However, the total of La 2 O 3 and Gd 2 O 3 component, since the optical constants of the target and devitrification resistance maintained 2
7〜60%、好ましくは32〜60%の範囲とする。 7-60%, preferably in the range of 32-60%.

【0008】本発明において、Ta 25成分は後述のZ [0008] In the present invention, Ta 2 O 5 component is described below Z
nO成分とともにガラスに含有させることによって、所定のTgを維持させつつ大幅に化学的耐久性を改善させる効果がみいだされた重要成分である。 By incorporating a glass with nO components, it is important component is significantly effective to improve the chemical durability was found while maintaining a predetermined Tg. その量が0.1 The amount is 0.1
%未満ではその効果が十分でなく、またその量が10% Its effect is insufficient%, also the amount of 10%
を超えるとガラスは耐失透性が悪化する。 The glass devitrification resistance is deteriorated and when it is more than. 上記効果を得るためには0.5%以上含有させることが好ましい。 To obtain the above effects it is preferable to contain 0.5% or more.

【0009】ZnO成分はガラスの耐失透性、溶融性の改善の点で有利な重要な成分であり、上記のとおり、T [0009] ZnO component is devitrification resistance, advantageous important component in terms of improving the meltability of the glass, as described above, T
25成分と共に含有させて化学的耐久性向上を著しくするが、その量は6〜25%の範囲が有効である。 It is contained with a 2 O 5 component greatly chemical durability improved, but the amount is effective in the range 6 to 25%. ただし、Ta 25 /ZnOの比率を0.1〜0.7の範囲に限定すると、一段と化学的耐久性に優れたガラスが得られるので好ましい。 However, to limit the proportion of Ta 2 O 5 / ZnO in the range of 0.1 to 0.7, the glass more excellent in chemical durability can be obtained.

【0010】ZrO 2成分はガラスの光学恒数の調整、 [0010] ZrO 2 component is adjusted optical constants of the glass,
化学的耐久性の改善のため必要に応じて添加させ得るが10%までで十分である。 Although capable of optionally added to improve the chemical durability is sufficient up to 10%. Nb 25成分はガラスの屈折率を高め、化学的耐久性を改善するのに有効であるが、 Nb 2 O 5 component increases the refractive index of the glass, is effective for improving chemical durability,
15%を超えるとガラスは失透しやすくなる。 More than 15%, the glass tends to be devitrified. 上記効果を得るためには0.5%以上含有させることが好ましい。 To obtain the above effects it is preferable to contain 0.5% or more. WO 3成分はガラスの屈折率を高め失透傾向を抑制し、溶融ガラスの粘性を小さくする効果があるが、5% WO 3 ingredient suppresses devitrification tendency increases the refractive index of the glass, it is effective to reduce the viscosity of the molten glass, 5%
を超えるとガラスの着色傾向が増大する。 The coloring tendency of the glass increases and exceeds. 上記効果を得るためには、0.5%以上含有させることが好ましい。 To obtain the above effect, it is preferable to contain 0.5% or more.

【0011】Li 2 O成分はガラスに低Tg特性を与える効果が特に大きいので重要な成分であるが、ガラスの耐失透性を維持しつつその効果を発揮させるためには、 [0011] Although Li 2 O component is an important component because is particularly large effect of the low Tg properties to the glass, in order to exert their effects while maintaining devitrification resistance of the glass,
その量は0.5〜5%の範囲にすべきである。 The amount should be in the range of 0.5% to 5%. Al 23 Al 2 O 3
成分は化学的耐久性向上に有効な成分であるので、10 Since component is an effective ingredient in the chemical durability, 10
%まで含有させることができる。 % To be included. しかし、その量が多くなると溶融ガラスの粘性が大きくなり過ぎるので5%以下が好ましい。 However, less than 5% is preferable because the viscosity of the molten glass the amount is often too large.

【0012】TiO 2成分はガラスの化学的耐久性を向上させるのに有効であり、3%まで含有させることができる。 [0012] TiO 2 component is effective in improving chemical durability of the glass may be contained up to 3%. なお、本発明の光学ガラスに所望の特性を損なわない範囲で、Yb 23 10%まで、F 2 5%まで等の成分を添加し得る。 Incidentally, within a range not to impair the desired properties to the optical glass of the present invention, Yb 2 to O 3 10%, it may be added components such as up to F 2 5%. また脱泡清澄剤として、Sb 23 As defoaming fining agents, Sb 2 O 3,
As 23等の成分を適量添加し得る。 Components such as the as 2 O 3 may be added in an appropriate amount.

【0013】 [0013]

【実施例】つぎに、本発明の光学ガラスにかかる実施組成例(No.1〜No.10)および前記従来の光学ガラスの比較組成例(No.AおよびNo.B)をこれらのガラスの光学恒数(Nd、νd)および耐酸性(S EXAMPLES Next, Comparative Composition Example exemplary Composition Example (No.1~No.10) and the conventional optical glass according to the optical glass of the present invention (No. A and No.B) of these glasses optical constants (Nd, [nu] d) and acid-resistant (S
R)数値とともに表1に示した。 It is shown in Table 1 together with R) value. なお、上記SR値は、 It is to be noted that the SR value,
国際標準化機構ISO8424;1987(E)の測定方法に準拠し、測定して得た結果を表したものである。 International Standards Organization ISO8424; conforming to the measurement method of 1987 (E), illustrates a result obtained by measurement.
ここで、SR値は所定の酸処理液中におけるガラス試料が0.1μmの浸食を受けるのに要した時間(h)によって等級付けしたものである。 Here, SR value is obtained by graded by the time the glass sample took to receive the erosion of 0.1μm in a predetermined acid treated liquid (h). SR値=4および5の場合はPH0.3の硝酸溶液を用い、それぞれ0.1〜1 For SR value = 4 and 5 using a nitric acid solution of PH0.3, respectively 0.1-1
hおよび0.1h以下を要したことを示す。 Indicating that it took less than h and 0.1h. また、SR In addition, SR
値=5、51、52および53の場合はいずれもPH Both A value = 5,51,52 and 53 PH
4.6の酢酸緩衝液を用い、それぞれ10h以上、1〜 Acetic acid buffer 4.6, respectively 10h or more, 1
10h、0.1〜1hおよび0.1h以下を要したことを示している。 10h, indicating that it took less 0.1~1h and 0.1 h.

【0014】 [0014]

【表1】 [Table 1]

【表1】 [Table 1]

【表1】 [Table 1]

【0015】表1にみられるとおり、本発明の実施組成例のガラス、No. [0015] As seen in Table 1, the glass of the exemplary compositions of the present invention, No. 8およびNo. 8 and No. 5は、それぞれほぼ同等の光学恒数を有する比較組成例のガラス、No. 5, the glass of Comparative Composition Examples each having substantially the number equivalent optical constants, No. A
およびNo. And No. Bと比較するといずれもSR値が向上し、 Both Compared to B improves SR value,
一段と優れた化学的耐久性を示している。 It shows the more excellent chemical durability. 本発明の他の実施組成例のガラスも同様に優れたSR値を示している。 Glass of another embodiment the composition of the present invention also show similar excellent SR value. また、これらのガラスはいずれも耐失透性に優れ、 Also, excellent in these both glass devitrification resistance,
また均質化し易い。 The homogenized easy. このため、上記実施例のガラスは製造が容易であり、モールドプレスに適しているうえ、優れた化学的耐久性を有している。 Therefore, the glass of the above embodiment is easy to manufacture, after suitable for mold press, has excellent chemical durability. なお、本発明の上記実施組成例のガラスは、いずれも硝酸塩、炭酸塩、酸化物等の通常の光学ガラス原料を用いて秤量・混合し、これを白金坩堝を用いて約1100〜1350℃、約2〜5 The glass of the above-described composition of the present invention are all nitrates, carbonates, weighed and mixed with the ordinary optical glass raw materials such as oxides, from about 1100 to 1350 ° C. using a platinum crucible which, about 2-5
時間で溶融脱泡し、攪拌均質化した後、金型に鋳込み徐冷することにより得ることができる。 Time to melt degassing, the mixture was stirred homogenized, it can be obtained by slow cooling casting in a mold.

【0016】 [0016]

【発明の効果】以上に述べたとおり、本発明の光学ガラスは、SiO 2 −B 23 −La 23 −Ta 25 −ZnO As mentioned above, according to the present invention, the optical glass of the present invention, SiO 2 -B 2 O 3 -La 2 O 3 -Ta 2 O 5 -ZnO
−Li 2 O系成分系の特定組成を有するものであるから、屈折率(Nd)約1.75〜1.85、アッベ数約35〜50の範囲の光学恒数と580℃以下のTgとを有し、かつ化学的耐久性に一段と優れている。 Since those having a specific composition of -Li 2 O system component, a refractive index (Nd) of about 1.75 to 1.85, and the Abbe number of about 35 to 50 optical constants range between 580 ° C. or less of Tg It has, and is further excellent in chemical durability. また製造が容易であり均質化し易く、モールドプレスに適している。 Also easily be homogenized easily manufactured, it is suitable for mold pressing.

Claims (2)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 重量%で、SiO 2 6〜15%、B 2 1. A weight%, SiO 2 6~15%, B 2 O
    3 15〜24%、ただしSiO 2 +B 23 21〜35 3 15-24%, with the proviso that SiO 2 + B 2 O 3 21~35
    %、La 23 25〜50%、Gd 23 0〜30%、ただしLa 23 +Gd 23 27〜60%、Ta 25 %, La 2 O 3 25~50% , Gd 2 O 3 0~30%, provided that La 2 O 3 + Gd 2 O 3 27~60%, Ta 2 O 5
    0.1〜10%、ZnO 6〜25%、ZrO 2 0〜 0.1~10%, ZnO 6~25%, ZrO 2 0~
    10%、Nb 25 0〜15%、WO 3 0〜5%、L 10%, Nb 2 O 5 0~15 %, WO 3 0~5%, L
    2 O 0.5〜5%、Al 23 0〜10%、TiO 2 i 2 O 0.5~5%, Al 2 O 3 0~10%, TiO 2
    0〜3%の範囲の各成分を含有し、かつ屈折率(N Contains the ingredients of 0-3% range and a refractive index (N
    d)約1.75〜1.85、アッベ数(νd)約35〜 d) about 1.75 to 1.85, the Abbe number (νd) about 35 to
    50の範囲の光学恒数と、580℃以下の転移温度(T 50 range and optical constants of, 580 ° C. or less of the transition temperature (T
    g)を有することを特徴とする光学ガラス。 Optical glass characterized by having a g).
  2. 【請求項2】 重量%で、SiO 2 6〜15%、B 2 2. A weight%, SiO 2 6~15%, B 2 O
    3 15〜24%、ただしSiO 2 +B 23 21〜30 3 15-24%, with the proviso that SiO 2 + B 2 O 3 21~30
    %、La 23 25〜50%、Gd 23 0〜30%、ただしLa 23 +Gd 23 32〜60%、Ta 25 %, La 2 O 3 25~50% , Gd 2 O 3 0~30%, provided that La 2 O 3 + Gd 2 O 3 32~60%, Ta 2 O 5
    0.5〜10%、ZnO 6〜25%、ZrO 2 0〜 0.5~10%, ZnO 6~25%, ZrO 2 0~
    10%、Nb 25 0.5〜15%、WO 3 0.5〜 10%, Nb 2 O 5 0.5~15 %, WO 3 0.5~
    5%、Li 2 O 0.5〜5%、Al 23 0〜5%、 5%, Li 2 O 0.5~5% , Al 2 O 3 0~5%,
    TiO 2 0〜3%の範囲の各成分を含有し、かつ屈折率(Nd)約1.75〜1.85、アッベ数(νd)約35〜50の範囲の光学恒数と、580℃以下の転移温度(Tg)を有することを特徴とする、特許請求の範囲第1項に記載の光学ガラス。 It contains each ingredient in the range of TiO 2 0 to 3%, and a refractive index (Nd) of about 1.75 to 1.85, and the Abbe number ([nu] d) optical constants of about 35-50 range, 580 ° C. or less and having a transition temperature (Tg), the optical glass according to paragraph 1 the claims.
JP11913293A 1993-04-22 1993-04-22 Optical Glass Expired - Lifetime JP2875709B2 (en)

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JP2875709B2 JP2875709B2 (en) 1999-03-31

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Cited By (18)

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EP1533285A1 (en) * 2003-11-17 2005-05-25 Kabushiki Kaisha Ohara Optical glass
US6977232B2 (en) 2001-10-24 2005-12-20 Hoya Corporation Optical glass, preform for press molding and optical part
WO2006022438A1 (en) * 2004-08-27 2006-03-02 Kabushiki Kaisha Ohara Optical glass
JP2006117502A (en) * 2004-04-26 2006-05-11 Ohara Inc Optical glass
WO2006093062A1 (en) * 2005-02-28 2006-09-08 Kabushiki Kaisha Ohara Optical glass
WO2007043262A1 (en) * 2005-10-11 2007-04-19 Ohara Inc. Optical glass
US7232779B2 (en) 2002-08-20 2007-06-19 Hoya Corporation Optical glass, precision press molding preform and method of manufacturing the same, optical element and method of manufacturing the same
WO2007145173A1 (en) * 2006-06-13 2007-12-21 Asahi Glass Co., Ltd. Optical glass and lens using the same
US7501369B2 (en) 2000-05-31 2009-03-10 Hoya Corporation Optical glass and process for the production of optical products
JP2009208974A (en) * 2008-02-29 2009-09-17 Ohara Inc Optical glass, optical element and optical instrument
JP2010215503A (en) * 2002-12-27 2010-09-30 Hoya Corp Optical glass, press-molding glass gob and optical element
US7820576B2 (en) 2007-02-22 2010-10-26 Konica Minolta Opto, Inc. Optical glass and optical element
US7955998B2 (en) 2006-03-23 2011-06-07 Hoya Corporation Optical glass, precision press-molding and process for the production thereof, and optical element and process for the production thereof
JP2011246337A (en) * 2010-04-30 2011-12-08 Ohara Inc Optical glass, optical element and method for manufacturing molded glass article
JP2012041268A (en) * 2011-11-14 2012-03-01 Ohara Inc Optical glass
US8207075B2 (en) 2008-01-31 2012-06-26 Ohara Inc. Optical glass
JP2012250900A (en) * 2010-10-08 2012-12-20 Ohara Inc Optical glass, preform material and optical element
KR20160111842A (en) 2015-03-17 2016-09-27 호야 가부시키가이샤 Optical glass and an optical element

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JPS6021828A (en) * 1983-07-14 1985-02-04 Hoya Corp Glass for spectacle lens
JPS60221338A (en) * 1984-04-12 1985-11-06 Ohara Inc Optical glass

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JPS52103412A (en) * 1976-02-26 1977-08-30 Obara Optical Glass Optical glass
JPS58125636A (en) * 1982-01-18 1983-07-26 Jenaer Glaswerk Schott & Gen High-refractive index optical glass having refractive index of 1.84-1.87 and abbe number of 30-33
JPS6021828A (en) * 1983-07-14 1985-02-04 Hoya Corp Glass for spectacle lens
JPS60221338A (en) * 1984-04-12 1985-11-06 Ohara Inc Optical glass

Cited By (25)

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US7501369B2 (en) 2000-05-31 2009-03-10 Hoya Corporation Optical glass and process for the production of optical products
US6977232B2 (en) 2001-10-24 2005-12-20 Hoya Corporation Optical glass, preform for press molding and optical part
US7232779B2 (en) 2002-08-20 2007-06-19 Hoya Corporation Optical glass, precision press molding preform and method of manufacturing the same, optical element and method of manufacturing the same
JP2010215503A (en) * 2002-12-27 2010-09-30 Hoya Corp Optical glass, press-molding glass gob and optical element
EP1533285A1 (en) * 2003-11-17 2005-05-25 Kabushiki Kaisha Ohara Optical glass
US7368404B2 (en) 2003-11-17 2008-05-06 Kabushiki Kaisha Ohara Optical glass
JP2006117502A (en) * 2004-04-26 2006-05-11 Ohara Inc Optical glass
WO2006022438A1 (en) * 2004-08-27 2006-03-02 Kabushiki Kaisha Ohara Optical glass
JP2006240889A (en) * 2005-02-28 2006-09-14 Ohara Inc Optical glass
US8148280B2 (en) * 2005-02-28 2012-04-03 Kabushiki Kaisha Ohara Optical glass
WO2006093062A1 (en) * 2005-02-28 2006-09-08 Kabushiki Kaisha Ohara Optical glass
KR100890588B1 (en) * 2005-02-28 2009-03-25 가부시키가이샤 오하라 Optical glass
WO2007043262A1 (en) * 2005-10-11 2007-04-19 Ohara Inc. Optical glass
US8110515B2 (en) 2005-10-11 2012-02-07 Ohara, Inc. Optical glass
JP2007106611A (en) * 2005-10-11 2007-04-26 Ohara Inc Optical glass
US7955998B2 (en) 2006-03-23 2011-06-07 Hoya Corporation Optical glass, precision press-molding and process for the production thereof, and optical element and process for the production thereof
JPWO2007145173A1 (en) * 2006-06-13 2009-10-29 旭硝子株式会社 Optical glass and lens using it
WO2007145173A1 (en) * 2006-06-13 2007-12-21 Asahi Glass Co., Ltd. Optical glass and lens using the same
US7820576B2 (en) 2007-02-22 2010-10-26 Konica Minolta Opto, Inc. Optical glass and optical element
US8207075B2 (en) 2008-01-31 2012-06-26 Ohara Inc. Optical glass
JP2009208974A (en) * 2008-02-29 2009-09-17 Ohara Inc Optical glass, optical element and optical instrument
JP2011246337A (en) * 2010-04-30 2011-12-08 Ohara Inc Optical glass, optical element and method for manufacturing molded glass article
JP2012250900A (en) * 2010-10-08 2012-12-20 Ohara Inc Optical glass, preform material and optical element
JP2012041268A (en) * 2011-11-14 2012-03-01 Ohara Inc Optical glass
KR20160111842A (en) 2015-03-17 2016-09-27 호야 가부시키가이샤 Optical glass and an optical element

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