JP2577794B2 - Optical glass for precision press - Google Patents
Optical glass for precision pressInfo
- Publication number
- JP2577794B2 JP2577794B2 JP1014915A JP1491589A JP2577794B2 JP 2577794 B2 JP2577794 B2 JP 2577794B2 JP 1014915 A JP1014915 A JP 1014915A JP 1491589 A JP1491589 A JP 1491589A JP 2577794 B2 JP2577794 B2 JP 2577794B2
- Authority
- JP
- Japan
- Prior art keywords
- glass
- temperature
- optical
- optical glass
- precision press
- 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 - Fee Related
Links
- 239000005304 optical glass Substances 0.000 title claims description 16
- 230000003287 optical effect Effects 0.000 claims description 10
- 229910018068 Li 2 O Inorganic materials 0.000 claims description 4
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 3
- 229910007541 Zn O Inorganic materials 0.000 claims 1
- 239000011521 glass Substances 0.000 description 20
- 239000000203 mixture Substances 0.000 description 12
- 238000004031 devitrification Methods 0.000 description 8
- 229910000464 lead oxide Inorganic materials 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 238000000465 moulding Methods 0.000 description 8
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 5
- 229910052731 fluorine Inorganic materials 0.000 description 5
- 239000011737 fluorine Substances 0.000 description 5
- 230000002411 adverse Effects 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000005303 fluorophosphate glass Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000005365 phosphate glass Substances 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229910021193 La 2 O 3 Inorganic materials 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000007496 glass forming Methods 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000004017 vitrification Methods 0.000 description 1
- 239000003039 volatile agent Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL 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
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/062—Glass compositions containing silica with less than 40% silica by weight
- C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
- C03C3/066—Glass compositions containing silica with less than 40% silica by weight containing boron containing zinc
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、比較的低温でプレス成形でき、プレス後研
削及び研磨を必要としない精密プレスに最適な光学ガラ
スに関するものである。本発明の精密プレス用光学ガラ
スは、カメラあるいは光ピックアップ用レンズ等の光学
部品に有用である。Description: TECHNICAL FIELD The present invention relates to an optical glass which can be press-molded at a relatively low temperature and is most suitable for a precision press which does not require post-press grinding and polishing. The optical glass for precision press of the present invention is useful for an optical component such as a camera or a lens for an optical pickup.
［従来の技術］ 近年、コンパクトディスクやカメラに非球面に加工さ
れたレンズが、性能向上や軽量化のために搭載されてき
ている。このようなことに関連して、非球面の加工技術
が従来の研削、研磨から、それらを必要としない精密プ
レス成形技術が開発され、それに伴いより低温でプレス
成形可能なガラスに対する要求が大きくなっている。し
かし従来よりある光学ガラスでは650℃以上という高温
でしかプレス成形できないものや、比較的低い温度でプ
レスできるものには型材に悪影響を及ぼす酸化鉛を含む
ものがほとんどであった。[Related Art] In recent years, lenses processed into an aspherical surface on compact discs and cameras have been mounted for improving performance and reducing weight. In connection with this, precision press molding technology that does not require aspheric surface processing technology has been developed from conventional grinding and polishing, and accordingly the demand for glass that can be pressed at lower temperature has increased. ing. However, conventional optical glasses that can be pressed only at a high temperature of 650 ° C. or higher, and those that can be pressed at a relatively low temperature mostly contain lead oxide that adversely affects the mold material.
従来同じような光学恒数を持つ光学ガラスとして、Ba
SFタイプが存在する。また精密プレス成形用のガラスと
して燐酸塩系ガラス（特開昭58−79839号公報、特開昭6
0−122749号公報、欧州特許第19342号明細書参照）、フ
ツホウ酸塩系ガラス（特開昭59−146952号公報参照）、
フルオロ燐酸塩系ガラス（特開昭56−59641号公報、特
開昭56−149343号公報、特開昭58−217451号公報参照）
が知られている。Conventionally, as an optical glass with the same optical constant, Ba
SF type exists. As a glass for precision press molding, phosphate glass (Japanese Patent Application Laid-Open No. 58-79839,
0-122,749, European Patent No. 19342), a fluoroborate-based glass (see JP-A-59-146952),
Fluorophosphate glass (see JP-A-56-59641, JP-A-56-149343, JP-A-58-217451)
It has been known.
［発明が解決しようとする課題］ しかし従来よりあるBaSFタイプの光学ガラスは、型材
に悪影響を及ぼす酸化鉛を含むものや、屈伏温度（At）
が600℃以上であり、そのプレス温度が650℃を超え型材
の寿命に悪影響を及ぼすものしか存在しなかった。精密
プレス成形における公知の型材等では、その成形温度が
高温になると型材の酸化等が生じ、型材の寿命の短縮化
や、面精度の保持が難しくなり、量産には適さない。ま
た、酸化鉛を含むガラス組成では、プレス成形中に酸化
鉛の揮発が生じ、揮発物が型材の表面に付着し、面精度
の保持が難しくなり型材のメンテナンスが多くなり、型
材の寿命が縮めることになりかねない。そのため精密プ
レスされるガラスは可能な限り低い温度で成形されるの
が望ましい。また、ガラス組成からは、酸化鉛を含まな
いものが望ましい。これらの問題を解決するために上記
プレス成形用ガラスの公開公報では、ガラス形成酸化物
に低温度化に有効な燐酸、及びホウ酸を選んでいる。し
かし、前記の燐酸塩系ガラス（特開昭58−79839号公
報、特開昭60−122749号公報、欧州特許第19342号明細
書）等では、低軟化点のガラス組成が示されているが、
本発明の光学恒数を有するガラス組成が見当たらず、ま
た酸化鉛を含んでいるガラス組成も上記公開公報中に見
られるが、型材へ悪影響を及ぼし、面精度の保持等問題
が生じる。さらに化学的耐久性の点で不十分なものもあ
る。また、フツホウ酸塩系ガラス（特開昭59−146952号
公報）、フルオロ燐酸塩系ガラス（特開昭56−59641号
公報、特開昭58−217451号公報）等では、ガラス組成に
フッ素を含んでいるが、フッ素の導入は低温度化及び低
分散化には有利であるが、ガラス溶融時における安定性
に欠けやすく、フッ素の揮発を伴うため均質なガラスが
得られにくい。またプレス成形時にフッ素の揮発による
環境への影響、成形装置への影響等問題が生じやすい。
さらに、上記公開公報の組成中に酸化鉛を含むものも認
められるが、前述の通りプレス成形用ガラスとしては適
当ではない。[Problems to be Solved by the Invention] However, the conventional BaSF type optical glass includes lead oxide which has an adverse effect on a mold material and a yield temperature (At).
Was 600 ° C. or higher, and only those having a pressing temperature exceeding 650 ° C. and adversely affecting the life of the mold material existed. In the case of a known mold material in precision press molding, when the molding temperature is high, oxidation of the mold material occurs, which makes it difficult to shorten the life of the mold material and maintain the surface accuracy, and is not suitable for mass production. In addition, in a glass composition containing lead oxide, volatilization of lead oxide occurs during press molding, and the volatiles adhere to the surface of the mold, making it difficult to maintain surface accuracy, increasing the maintenance of the mold, and shortening the life of the mold. It could be. Therefore, it is desirable that the glass to be precision pressed be formed at the lowest possible temperature. Further, from the viewpoint of the glass composition, it is desirable that the composition does not contain lead oxide. In order to solve these problems, in the above publication of press forming glass, phosphoric acid and boric acid, which are effective for lowering the temperature, are selected for the glass forming oxide. However, in the above-mentioned phosphate glass (Japanese Patent Application Laid-Open No. 58-79839, Japanese Patent Application Laid-Open No. 60-1222749, and European Patent No. 19342), a glass composition having a low softening point is shown. ,
Although the glass composition having an optical constant of the present invention is not found, and a glass composition containing lead oxide is also found in the above-mentioned publication, it adversely affects the mold material and causes problems such as maintenance of surface accuracy. Further, some of them are insufficient in terms of chemical durability. Further, in the case of fluoroborate glass (Japanese Patent Application Laid-Open No. 59-144692) and fluorophosphate glass (Japanese Patent Application Laid-Open No. 56-59641, Japanese Patent Application Laid-Open No. 58-217451), fluorine is added to the glass composition. Although the introduction of fluorine is advantageous for lowering the temperature and lowering the dispersion of fluorine, it is difficult to obtain a homogeneous glass because the stability during melting of the glass is liable to be lacking and the volatilization of fluorine is involved. In addition, problems such as the influence on the environment due to the volatilization of fluorine during press molding and the influence on the molding apparatus are likely to occur.
Further, although a composition containing lead oxide is also recognized in the composition of the above-mentioned publication, it is not suitable as a press-molding glass as described above.
従って本発明の第１の目的は、酸化鉛を含まず精密プ
レス用として最適である光学ガラスを提供することにあ
る。第２の目的は、屈折率（nd）が1.69〜1.74、アッベ
数（νｄ）が35〜40という光学恒数を有する、屈伏温度
（At）が550℃以下の光学ガラスを提供することにあ
る。Accordingly, a first object of the present invention is to provide an optical glass which does not contain lead oxide and is optimal for precision press. A second object is to provide an optical glass having a refractive index (nd) of 1.69 to 1.74, an Abbe number (νd) of 35 to 40, and an optical constant of 550 ° C. or lower, having a yield temperature (At) of 550 ° C. or less. .
［課題を解決する手段］ 上記のような点を考慮して、本発明者らはB2O3−SiO2
−Nb2O5−Na2O−ZnOを基本とする系において、BaSFタイ
プの光学ガラスとほぼ同等の光学恒数を有し、600℃以
下の温度で安定に精密プレスが実施され、型材への影響
もほとんどなく、さらに上記特許公開公報の精密プレス
用の光学ガラスよりも安定性、化学的耐久性、耐候性、
溶融性に優れ、従来の光学ガラスと同等に扱え、精密プ
レス用光学ガラスとして最適であるところのガラス組成
を見いだし、本発明に到達したものである。[Means for Solving the Problems] In view of the above points, the present inventors consider that B 2 O 3 —SiO 2
In a system based on -Nb 2 O 5 -Na 2 O-ZnO, the optical constants are almost the same as those of BaSF type optical glass. There is almost no effect, more stability than the optical glass for precision press of the above patent publication, chemical durability, weather resistance,
The present inventors have found a glass composition which is excellent in melting property, can be treated similarly to conventional optical glass, and is optimal as an optical glass for precision press, and has reached the present invention.
すなわち、本発明を重量％（以下％で表す）で示すと
B2O3が19.0〜30.0％、SiO2が0.5〜10.5％、Nb2O5が9.0
〜19.0％、Na2Oが1.5〜8.0％、ZnOが44.0〜60.0％、TiO
2が０〜4.0％、Al2O3が０〜5.0％、Li2Oが０〜3.0％、K
2Oが０〜4.0％、MgOが０〜5.0％、CaOが０〜5.0％、SrO
が０〜5.0％及びBaOが０〜5.0％から成る組成を有して
いる。That is, the present invention is expressed in terms of% by weight (hereinafter expressed in%).
B 2 O 3 is 19.0 to 30.0%, SiO 2 is 0.5~10.5%, Nb 2 O 5 is 9.0
~ 19.0%, Na 2 O is 1.5 ~ 8.0%, ZnO is 44.0 ~ 60.0%, TiO
2 is 0 to 4.0%, Al 2 O 3 is 0 to 5.0%, Li 2 O is 0 to 3.0%, K
2 O is 0 to 4.0%, MgO is 0 to 5.0%, CaO is 0 to 5.0%, SrO
Has a composition of 0 to 5.0% and BaO of 0 to 5.0%.
本発明にかかる精密プレス用光学ガラスの各成分範囲
を、上記のように限定した理由は次の通りである。The reasons for limiting the component ranges of the optical glass for precision press according to the present invention as described above are as follows.
B2O3は、本発明の必須配合成分であり、ガラスの網目
を構成する主成分であるが、30.0％を超えると目的とす
る屈折率が得られず、19.0％より少ないと失透傾向が増
大する。B 2 O 3 is an essential component of the present invention, and is a main component constituting a glass network. However, if it exceeds 30.0%, a desired refractive index cannot be obtained, and if it is less than 19.0%, devitrification tends to occur. Increase.
SiO2は、必須配合成分でありB2O3と同様ガラスの網目
を構成するが、10.5％を超えるとプレス温度の上昇を招
き、0.5％より少ないと失透傾向が増大する。SiO 2 is an essential component and forms a glass network like B 2 O 3. However, if it exceeds 10.5%, the press temperature will increase, and if it is less than 0.5%, the devitrification tendency will increase.
Nb2O5は、必須配合成分であり屈折率を上げる効果を
持つが、9.0％より少ないと目的とする屈折率が得られ
ず、19.0％より多いとプレス温度の上昇をもたらし、ま
た失透傾向も増大する。Nb 2 O 5 is an essential component and has the effect of raising the refractive index, but if it is less than 9.0%, the desired refractive index cannot be obtained, and if it is more than 19.0%, the press temperature will increase, and devitrification will occur. The tendency also increases.
Na2Oは、必須配合成分でありプレス温度を下げる効果
を持つが、8.0％より多いと失透傾向が増大し、1.5％よ
り少ないと上記効果が少なく、プレス温度の上昇を招
く。Na 2 O is an essential component and has an effect of lowering the press temperature. However, if it is more than 8.0%, the tendency to devitrify increases, and if it is less than 1.5%, the above effect is small and the press temperature rises.
ZnOは、必須配合成分でありZnOを大量に使用すること
によりBaSFタイプの光学恒数を得ることができた。しか
し、60.0％より多いと失透傾向が増大し、44.0％より少
ないと目的とする屈折率が得られない。ZnO is an essential component, and by using ZnO in a large amount, a BaSF type optical constant could be obtained. However, if it is more than 60.0%, the tendency of devitrification increases, and if it is less than 44.0%, a desired refractive index cannot be obtained.
TiO2は、任意配合成分であり屈折率の調整を目的に加
えられるが、4.0％より多いと失透傾向が増大する。TiO 2 is an optional component and can be added for the purpose of adjusting the refractive index. However, if it is more than 4.0%, the tendency of devitrification increases.
Al2O3は、任意配合成分であり屈折率の調整、化学的
耐久性の向上を目的に加えられるが、5.0％より多いと
失透傾向が増大し、プレス温度の上昇をもたらす。Al 2 O 3 is an optional component and is added for the purpose of adjusting the refractive index and improving the chemical durability. However, if it is more than 5.0%, the tendency of devitrification increases, and the press temperature increases.
Li2Oは、任意配合成分であり適量の配合はプレス温度
を低下させる働きを有するが、3.0％より多いと失透傾
向が増大し、化学的耐久性も悪化する。Li 2 O is an optional compounding component, and an appropriate amount of compounding has a function of lowering the pressing temperature. However, if it is more than 3.0%, the tendency of devitrification increases, and the chemical durability also deteriorates.
K2Oは、任意配合成分でありLi2Oと同様な働きを示す
が、4.0％より多いと失透傾向が増大する。K 2 O is an optional component and exhibits the same function as Li 2 O, but if it is more than 4.0%, the tendency to devitrify increases.
MgO、CaO、SrO及びBaOは任意配合成分でありガラス化
領域の拡大、及び屈折率の調整に使用されるが、5.0％
より多いと失透傾向が増大する。MgO, CaO, SrO and BaO are optional components and are used for expanding the vitrification area and adjusting the refractive index.
If it is larger, the tendency to devitrify increases.
本発明の光学ガラスには、上記成分のほかに光学恒数
の調整、溶融性の改善、ガラス化領域の拡大などのため
に、本発明の目的から外れないかぎりCs2O、ZrO2、La2O
3、Y2O3、Ta2O5、Yb2O3などを含有させることができ
る。The optical glass of the present invention, in addition to the adjustment of the optical constants of the components, improving the melting property, such as for expansion of the glass region, Cs 2 O unless beyond the scope of the present invention, ZrO 2, La 2 O
3 , Y 2 O 3 , Ta 2 O 5 , Yb 2 O 3 and the like.
［実施例］ 次に本発明に係わる実施例の組成（単位は重量％）、
屈折率（nd）、アッベ数（νｄ）、屈伏温度（At）を第
１表に示す。[Example] Next, the composition of the example according to the present invention (unit is% by weight),
Table 1 shows the refractive index (nd), Abbe number (νd), and yield temperature (At).
本発明の光学ガラスは、各成分の原料として、各々相
当する酸化物、水酸化物、炭酸塩、硝酸塩などを使用
し、所定の割合で秤量し、充分混合してガラス調合原料
として、白金製るつぼに投入し、電気炉中で1000〜1300
℃で溶融し、白金製攪拌棒にて攪拌し、清澄、均質化し
てから適当な温度に予熱した金型内に鋳込んだ後、徐冷
して作製された。The optical glass of the present invention uses, as raw materials of the respective components, oxides, hydroxides, carbonates, nitrates and the like corresponding thereto, weighs them at a predetermined ratio, mixes them well, and mixes them with platinum. Put in a crucible and 1000-1300 in an electric furnace
C., stirred with a platinum stirring rod, clarified and homogenized, cast into a mold preheated to an appropriate temperature, and then gradually cooled.
なおガラスの着色を防ぎ、脱泡のため少量のAs2O3を
加えること、または工業上良く知られている脱泡成分の
少量添加は、本発明の効果に影響を与えない。Incidentally prevent coloration of the glass, adding a small amount of a small amount of As 2 O 3 adding or industrial well-known defoaming component for defoaming does not affect the effects of the present invention.
［発明の効果］ 本発明によれば、屈折率（nd）が1.69〜1.74、アッベ
数（νｄ）が35〜40の光学恒数を持ち、屈伏温度（AT）
が550℃以下である、失透に対して安定であり、比較的
低い温度で精密プレスが可能であり、型材に影響を及ぼ
さないことを特徴とする精密プレス用光学ガラスが得ら
れる。According to the present invention, the refractive index (nd) has an optical constant of 1.69 to 1.74, the Abbe number (νd) is 35 to 40, and the breakdown temperature (AT).
Is 550 ° C. or less, is stable against devitrification, can be precision pressed at a relatively low temperature, and has no influence on a mold material.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭48−59116（ＪＰ，Ａ) 特開 平１−286934（ＪＰ，Ａ) 特開 昭61−146730（ＪＰ，Ａ) 特公 昭45−13955（ＪＰ，Ｂ１) ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-48-59116 (JP, A) JP-A-1-286934 (JP, A) JP-A-61-146730 (JP, A) JP-B-45 13955 (JP, B1)
Claims (1)
〜10.5％、Nb2O5が9.0〜19.0％、Na2Oが1.5〜8.0％、Zn
Oが44.0〜60.0％、TiO2が０〜4.0％、Al2O3が０〜5.0
％、Li2Oが０〜3.0％、K2Oが０〜4.0％、MgOが０〜5.0
％、CaOが０〜5.0％、SrOが０〜5.0％及びBaOが０〜5.0
％から成り、屈折率（nd）が1.69〜1.74、アッベ数（ν
ｄ）が35〜40の光学恒数を持ち、屈伏温度（AT）が550
℃以下であることを特徴とする精密プレス用光学ガラ
ス。1. A B 2 O 3 in weight percent from 19.0 to 30.0%, SiO 2 0.5
~10.5%, Nb 2 O 5 is 9.0~19.0%, Na 2 O is 1.5 to 8.0%, Zn
O is 44.0 to 60.0%, TiO 2 is 0~4.0%, Al 2 O 3 is from 0 to 5.0
%, Li 2 O is 0 to 3.0%, K 2 O is 0 to 4.0%, MgO is 0 to 5.0
%, 0 to 5.0% of CaO, 0 to 5.0% of SrO and 0 to 5.0 of BaO
%, Refractive index (nd) 1.69 to 1.74, Abbe number (ν
d) has an optical constant of 35 to 40 and yield temperature (AT) of 550
An optical glass for precision press, wherein the temperature is not higher than ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1014915A JP2577794B2 (en) | 1989-01-24 | 1989-01-24 | Optical glass for precision press |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1014915A JP2577794B2 (en) | 1989-01-24 | 1989-01-24 | Optical glass for precision press |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02263728A JPH02263728A (en) | 1990-10-26 |
| JP2577794B2 true JP2577794B2 (en) | 1997-02-05 |
Family
ID=11874262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1014915A Expired - Fee Related JP2577794B2 (en) | 1989-01-24 | 1989-01-24 | Optical glass for precision press |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2577794B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4394036B2 (en) * | 2004-09-09 | 2010-01-06 | 豊田合成株式会社 | Solid state device |
| DE102005042778A1 (en) | 2004-09-09 | 2006-04-13 | Toyoda Gosei Co., Ltd., Nishikasugai | Optical solid state device |
| JP5307364B2 (en) * | 2006-08-03 | 2013-10-02 | 豊田合成株式会社 | Method for producing phosphor-containing glass and method for producing solid-state device |
| JP5688887B2 (en) * | 2009-10-02 | 2015-03-25 | 株式会社住田光学ガラス | Optical glass |
| WO2018154961A1 (en) * | 2017-02-21 | 2018-08-30 | 株式会社 オハラ | Optical glass, preform, and optical element |
-
1989
- 1989-01-24 JP JP1014915A patent/JP2577794B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02263728A (en) | 1990-10-26 |
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