JP2002173338A - Front glass for illumination - Google Patents

Front glass for illumination

Info

Publication number
JP2002173338A
JP2002173338A JP2000366506A JP2000366506A JP2002173338A JP 2002173338 A JP2002173338 A JP 2002173338A JP 2000366506 A JP2000366506 A JP 2000366506A JP 2000366506 A JP2000366506 A JP 2000366506A JP 2002173338 A JP2002173338 A JP 2002173338A
Authority
JP
Japan
Prior art keywords
glass
front glass
temperature
lighting
grain size
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.)
Abandoned
Application number
JP2000366506A
Other languages
Japanese (ja)
Inventor
Hiroshi Yamamoto
浩史 山本
Takaharu Toda
貴治 戸田
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.)
AGC Techno Glass Co Ltd
Original Assignee
Asahi Techno Glass Corp
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 Asahi Techno Glass Corp filed Critical Asahi Techno Glass Corp
Priority to JP2000366506A priority Critical patent/JP2002173338A/en
Publication of JP2002173338A publication Critical patent/JP2002173338A/en
Abandoned legal-status Critical Current

Links

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
    • C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
    • C03C10/0036—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing SiO2, Al2O3 and a divalent metal oxide as main constituents
    • C03C10/0045—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing SiO2, Al2O3 and a divalent metal oxide as main constituents containing SiO2, Al2O3 and MgO as main constituents

Abstract

PROBLEM TO BE SOLVED: To provide front glass for illumination which is used for an illuminator and has excellent thermal impact resistance to prevent damage of a light source and splashing of glass splinters to the outside of lighting fixtures in case of the failure of the light source and to facilitate forming of the front glass for illumination. SOLUTION: This front lens for illumination is transparent crystallized glass which contains, by mass per cent, 58 to 70% SiO2, 18 to 25% Al2O3, 0.5 to 5% Li2O, 0 to 2% Na2O, 0 to 2% K2O, 1 to 5% MgO, 0 to 0.3% CaO, 0.1 to 2% BaO, 0.1 to 7% ZnO, 0.1 to 7% TiO2, 0.5 to 7% ZrO2 and 0.1 to 2.5% Sb2O3 and in which a β-quartz solid solution is deposited as a main crystal.

Description

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

【０００１】[0001]

【発明の属する技術分野】 本発明は赤外線を利用する
照明器具に使用される前面ガラスに関するものである。
本明細書で使用する単なる『％』表示は質量％を表すも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front glass used for a lighting device utilizing infrared rays.
As used herein, the mere "%" designation indicates% by mass.

【０００２】[0002]

【従来技術】従来、赤外線を利用する照明器具は医療
用、乾燥用、保温用などに使用され、赤外線を照射する
手段としては、光源である白熱電球または高輝度放電ラ
ンプ（以下、ランプとする。）のガラス球内面にアルミ
反射膜等を被覆したものや、光源とともに使用されるリ
フレクターの内面にアルミ反射膜等の赤外線反射膜を被
覆したものであった。そして、乾燥用や保温用などに使
用されるリフレクターを備える照明器具で、直接人体に
使用されないものでは照射される赤外線を効率よく使用
するために、その前面には前面ガラスが使用されていな
かった。2. Description of the Related Art Conventionally, a lighting apparatus using infrared rays has been used for medical treatment, drying, heat retention, and the like. ), The inner surface of a glass sphere was coated with an aluminum reflective film or the like, or the inner surface of a reflector used with a light source was coated with an infrared reflective film such as an aluminum reflective film. And in the case of lighting fixtures equipped with reflectors used for drying and warming, those that are not directly used for the human body do not use a front glass on the front in order to efficiently use the irradiated infrared rays. .

【０００３】しかし、照明器具を使用したときランプ自
身も非常に高温となるため、ランプの外表面に何らかの
原因により水滴等が付着するとヒートショックによりラ
ンプが破損する恐れがあった。[0003] However, the lamp itself becomes extremely hot when the lighting equipment is used, and if water droplets or the like adhere to the outer surface of the lamp for some reason, the lamp may be damaged by heat shock.

【０００４】[0004]

【発明が解決しようとする課題】これに対して、リフレ
クターの前面を覆う前面ガラスを備えるものが考えられ
たが、耐熱性の優れるホウケイ酸ガラスでも前面ガラス
のリフレクター側の温度で５５０℃以下でしか使用する
ことができず、耐熱衝撃性による試験でも温度差２５０
℃が限界であるため、前面ガラスの使用が控えられてい
た。また、結晶化ガラスはホウケイ酸ガラスよりも耐熱
性および耐熱衝撃性について優れているが、ガラス内部
に形成されている結晶により赤外線が散乱され、前面ガ
ラス自体に熱が蓄積されやすく、効率的に赤外線を使用
できなかった。また、照明用前面ガラスの構成元素には
耐熱性を向上させるために、ＳｉＯ2、Ａｌ2Ｏ3を多く
含む場合、ガラスが“冷めやすく”成形時に粘度が高く
なるので成形が困難でもあった。On the other hand, it has been proposed to provide a front glass that covers the front of the reflector. However, even a borosilicate glass having excellent heat resistance has a temperature of 550 ° C. or less at the temperature of the front glass on the reflector side. Can be used, and a temperature difference of 250
Due to the limit of ° C., the use of front glass was refrained. In addition, crystallized glass has better heat resistance and thermal shock resistance than borosilicate glass, but the crystals formed inside the glass scatter infrared rays, heat is easily accumulated in the front glass itself, and efficient Infrared light could not be used. In addition, when a large amount of SiO 2 or Al 2 O 3 is included in the constituent elements of the front glass for lighting in order to improve heat resistance, the glass is “easy to cool” and the viscosity increases during the molding, so that molding was also difficult. .

【０００５】そこで、本発明は照明器具に使用される前
面ガラスにおいて、光源の破損および破損した場合のガ
ラス片の照明器具外への飛散を防止する耐熱衝撃性に優
れた照明用前面ガラスを提供することを目的とする。さ
らに、照明用前面ガラスの成形を容易にすることも目的
とする。Accordingly, the present invention provides a front glass for lighting which is excellent in thermal shock resistance and which prevents breakage of a light source and scattering of glass pieces out of the lighting fixture when the light source is broken. The purpose is to do. It is another object of the present invention to facilitate molding of a front glass for lighting.

【０００６】[0006]

【課題を解決するための手段】上記課題を解決するため
に、請求項１に対応する発明は、照明用前面ガラスにお
いて、質量百分率で、ＳｉＯ2 ５８〜７０％、Ａｌ2Ｏ
3 １８〜２５％、Ｌｉ2Ｏ ０．５〜５％、Ｎａ2Ｏ
０〜２％、Ｋ2Ｏ ０〜２％、ＭｇＯ １〜５％、Ｃａ
Ｏ ０〜０．３％、ＢａＯ ０．１〜２％、ＺｎＯ
０．１〜７％、ＴｉＯ2 ０．１〜７％、ＺｒＯ2 ０．
５〜７％およびＳｂ2Ｏ3 ０．１〜２．５％を含有し、
主結晶としてβ−石英固溶体を析出させた透明結晶化ガ
ラスとした。前面ガラスを透明結晶化ガラスとしたこと
により、ランプから照射される赤外線を直線的に効率良
く前方へ透過させることができる。ここで、本発明でい
う『透明結晶化ガラス』とは、必ずしも可視光全域を透
過する必要はなく、少なくとも近赤外線（７６０ｎｍ〜
２５００ｎｍ）を効率良く透過できるものをいう。すな
わち、結晶を析出する前のガラスが着色ガラスであろう
となかろうと、結晶を析出させた後のガラスが少なくと
も近赤外線を効率良く透過できれば良いのである。In order to solve the above-mentioned problems, the invention according to claim 1 is a method for manufacturing a front glass for lighting, in which, in terms of mass percentage, SiO 2 is 58 to 70% and Al 2 O
3 18~25%, Li 2 O 0.5~5 %, Na 2 O
0~2%, K 2 O 0~2% , MgO 1~5%, Ca
O 0-0.3%, BaO 0.1-2%, ZnO
0.1~7%, TiO 2 0.1~7%, ZrO 2 0.
Containing 5-7% and Sb 2 O 3 0.1~2.5%,
A transparent crystallized glass in which a β-quartz solid solution was precipitated as a main crystal was used. By using a transparent crystallized glass for the front glass, infrared rays emitted from the lamp can be transmitted linearly and efficiently forward. Here, the “transparent crystallized glass” in the present invention does not necessarily need to transmit the entire visible light range, and at least a near infrared ray (760 nm to 760 nm).
2500 nm). That is, regardless of whether the glass before crystal deposition is a colored glass or not, it is only necessary that the glass after crystal deposition can efficiently transmit at least near infrared rays.

【０００７】請求項２に対応する発明は、請求項１記載
の透明結晶化ガラスの組成に、０．０１〜３質量％のフ
ッ素（Ｆ）を含有するものとした。According to a second aspect of the present invention, the composition of the transparent crystallized glass according to the first aspect contains 0.01 to 3% by mass of fluorine (F).

【０００８】請求項３に対応する発明は、請求項１また
は２記載の透明結晶化ガラスの組成に、０〜３質量％の
Ｐ2Ｏ5を含有するものとした。According to a third aspect of the present invention, the composition of the transparent crystallized glass according to the first or second aspect contains 0 to 3% by mass of P 2 O 5 .

【０００９】請求項４に対応する発明は、請求項４また
は５記載の透明結晶化ガラスの組成に、０〜３質量％の
Ｂ2Ｏ3を含有するものとした。According to a fourth aspect of the present invention, the composition of the transparent crystallized glass according to the fourth or fifth aspect contains 0 to 3% by mass of B 2 O 3 .

【００１０】ここで、透明結晶化ガラス組成の限定理由
を以下に述べる。ＳｉＯ2はガラスを形成する主成分で
あるが、含有量が５８％未満では熱膨脹係数が大きくな
り耐熱性が低下し、かつ得られる結晶化ガラスの結晶粒
径が粗大化し、透明な結晶化ガラスが得られにくくなる
からである。また、含有量が７０％を越えてしまうと、
ガラスの溶融性が悪化し、生成する結晶粒径の均質化が
困難となってしまう。好ましくは、６０〜６４％であ
る。Here, the reasons for limiting the composition of the transparent crystallized glass will be described below. SiO 2 is a main component forming glass, but if the content is less than 58%, the thermal expansion coefficient increases, the heat resistance decreases, and the crystal grain size of the crystallized glass obtained becomes coarse, and the transparent crystallized glass is formed. Is difficult to obtain. If the content exceeds 70%,
The melting property of the glass deteriorates, and it becomes difficult to homogenize the crystal grain size. Preferably, it is 60 to 64%.

【００１１】Ａｌ2Ｏ3の含有量が１８％未満では分相傾
向が強くなってガラスが失透しやすくなり、かつ結晶の
析出が困難となってしまう。また、含有量が２５％を越
えてしまうと、溶融温度を高くしなければガラスの溶融
が困難となってしまう（溶融温度が低い場合ガラス中に
脈理が生じやすくなる）。好ましくは、２０〜２３％で
ある。When the content of Al 2 O 3 is less than 18%, the tendency of phase separation becomes strong, the glass tends to be devitrified, and the precipitation of crystals becomes difficult. On the other hand, if the content exceeds 25%, it becomes difficult to melt the glass unless the melting temperature is increased (striae tend to be formed in the glass when the melting temperature is low). Preferably, it is 20 to 23%.

【００１２】Ｌｉ2Ｏの含有量が０．５％未満ではガラ
スの溶融性が悪く、結晶の析出が困難となり、含有量が
５％を越えると析出する結晶粒径が粗大化し、所望とす
る結晶を得ることができなくなる。好ましくは、１〜
２．５％である。If the content of Li 2 O is less than 0.5%, the melting property of the glass is poor, and the precipitation of crystals becomes difficult. If the content exceeds 5%, the crystal grain size to be precipitated becomes coarse, which is desirable. Crystals cannot be obtained. Preferably, 1 to
2.5%.

【００１３】ＭｇＯ、ＣａＯ、ＢａＯおよびＺｎＯは、
必須成分については含有量が下限値未満であると結晶の
析出が困難となり、それぞれの含有量が上限値を越える
と失透傾向が強くなり、得られる結晶化ガラスの結晶粒
径が粗大化してしまう。好ましくは、ＭｇＯで１．５〜
４％であり、ＣａＯで０．１〜０．２％であり、ＢａＯ
で０．４〜１．５％である。[0013] MgO, CaO, BaO and ZnO are
For essential components, if the content is less than the lower limit, precipitation of crystals becomes difficult, and if the content of each exceeds the upper limit, the devitrification tendency becomes strong, and the crystal grain size of the obtained crystallized glass becomes coarse. I will. Preferably, MgO is 1.5 to
4%, 0.1-0.2% with CaO, BaO
Is 0.4 to 1.5%.

【００１４】ＴｉＯ2およびＺｒＯ2は結晶核形成剤とし
て作用する成分であり、それぞれの含有量が、下限値未
満では結晶核が少なくなりすぎてしまい結晶の析出が困
難になり、上限値を越えると結晶核が多くなりすぎて結
晶核の成長速度にバラツキが生じてしまい、析出する結
晶中に粗大化した結晶が含まれるようになり、結晶化ガ
ラスに失透が生じてしまう。好ましくは、ＴｉＯ2で
１．５〜５％であり、ＺｒＯ2で１〜４％である。TiO 2 and ZrO 2 are components that act as crystal nucleating agents. If the content of each is less than the lower limit, the number of crystal nuclei becomes too small, so that precipitation of crystals becomes difficult, and the content exceeds the upper limit. In such a case, the crystal nuclei become too large, and the growth rate of the crystal nuclei varies, so that the precipitated crystals include coarse crystals and devitrification occurs in the crystallized glass. Preferred are 1.5 to 5% for TiO 2, 1 to 4% for ZrO 2.

【００１５】Ｎａ2ＯおよびＫ2Ｏはガラスの溶融性を向
上させるものであるが、それぞれの含有量が、上限値を
越えると結晶粒径が粗大化し、失透しやすくなる。[0015] Na 2 O and K 2 O improve the melting property of the glass. However, if the content of each exceeds the upper limit, the crystal grain size becomes coarse and the glass tends to be devitrified.

【００１６】Ｓｂ2Ｏ3は清澄剤として使用されるが、そ
の含有量が０．１％未満であると、清澄作用が得られ
ず、含有量が２．５％を越えてしまうと発泡の原因とな
ってしまう。好ましくは、０．５〜２％である。Sb 2 O 3 is used as a fining agent, but if its content is less than 0.1%, no fining action can be obtained, and if its content exceeds 2.5%, foaming will occur. Cause it. Preferably, it is 0.5 to 2%.

【００１７】フッ素（Ｆ）はガラスの粘性を低下させる
ために含有させるが、含有量が３％を越えると、結晶粒
径が粗大化し、失透しやすくなり、０．０１未満である
と成形性を改善することができなくなる。好ましくは、
０．０３〜１．５％である。Fluorine (F) is contained in order to reduce the viscosity of the glass. If the content exceeds 3%, the crystal grain size becomes coarse and the glass tends to be devitrified. The performance cannot be improved. Preferably,
0.03 to 1.5%.

【００１８】Ｐ2Ｏ5およびＢ2Ｏ3はガラスの粘性を低下
させるために含有させてもよいが、それぞれの含有量が
上限値を越えると、結晶粒径が粗大化し、失透しやすく
なる。好ましくは、Ｐ2Ｏ5で０．３〜１％であり、Ｂ2
Ｏ3で０．３〜１．５％である。P 2 O 5 and B 2 O 3 may be added to reduce the viscosity of the glass. However, if the content of each exceeds the upper limit, the crystal grain size becomes coarse and the glass tends to be devitrified. Become. Preferably, P 2 O 5 is 0.3 to 1%, and B 2
O 3 in the 0.3 to 1.5%.

【００１９】請求項５に対応する発明は、請求項１ない
し４いずれか記載の照明用前面ガラスにおいて、前面ガ
ラスの平行透過率が７６０〜２５００ｎｍの波長範囲に
渡って７５％以上の透過率を有するものとした。このよ
うに、近赤外線域の平行透過率の最低値を７５％以上と
したことにより、前面ガラスに蓄積される熱を減少させ
ることができる。したがって、高出力の光源を使用する
ことが可能となる。ここで、本発明でいう『平行透過
率』とは、赤外分光法によって測定されたものあって、
測定の際に前面ガラスによって散乱された光を積分球な
どを用いて集光させるなどの手段を行わずに測定した透
過率のことである。According to a fifth aspect of the present invention, in the front glass for lighting according to any one of the first to fourth aspects, the parallel transmittance of the front glass is 75% or more over a wavelength range of 760 to 2500 nm. It had it. By setting the minimum value of the parallel transmittance in the near infrared region to 75% or more, heat accumulated in the front glass can be reduced. Therefore, it is possible to use a high-output light source. Here, the “parallel transmittance” in the present invention is a value measured by infrared spectroscopy,
This is a transmittance measured without performing any means such as condensing light scattered by the front glass at the time of measurement using an integrating sphere or the like.

【００２０】請求項６に対応する発明は、請求項１ない
し５に記載された透明結晶化ガラスの結晶粒径を４００
ｎｍ以下とした。結晶粒径が結晶化ガラスの透明性に影
響を大きく関与しているため、結晶粒径を４００ｎｍ以
下としたことにより、結晶化ガラスを透明とすることが
でき、かつランプから照射される赤外線を直線的に効率
良く前面ガラスの前方へ透過させることができる。結晶
粒径の好ましい大きさは３００ｎｍ以下であり、さらに
好ましくは１００ｎｍ以下である。According to a sixth aspect of the present invention, the transparent crystallized glass according to the first to fifth aspects has a crystal grain size of 400.
nm or less. Since the crystal grain size greatly affects the transparency of the crystallized glass, by setting the crystal grain size to 400 nm or less, the crystallized glass can be made transparent, and infrared rays emitted from a lamp can be reduced. The light can be transmitted linearly and efficiently to the front of the front glass. The preferred size of the crystal grain size is 300 nm or less, more preferably 100 nm or less.

【００２１】[0021]

【発明の実施の形態】（実施の形態１）この実施の形態
の前面ガラスは、酸化物組成でＳｉＯ2 ５８〜７０
％、Ａｌ2Ｏ3 １８〜２５％、Ｌｉ2Ｏ ０．５〜５
％、Ｎａ2Ｏ ０〜２％、Ｋ2Ｏ ０〜２％、ＭｇＯ １
〜５％、ＣａＯ ０〜０．３％、ＢａＯ０．１〜２％、
ＺｎＯ ０．１〜７％、ＴｉＯ2 ０．１〜７％、Ｚｒ
Ｏ2 ０．５〜７％およびＳｂ2Ｏ3 ０．１〜２．５％
を含有したものを原ガラスとする、または、この組成の
他にＰ2Ｏ5 ０〜３質量％もしくはＢ2Ｏ3 ０〜３質量
％を加えたものを原ガラスとする。そして、この原ガラ
スを溶融しプレス成形などで前面ガラスに成形し徐冷
後、１次熱処理し結晶核生成を行う。次いで、結晶核生
成温度より高い温度で２次熱処理し、主結晶として結晶
粒径４００ｎｍ以下のβ−石英固溶体を析出させる。こ
の結晶の析出により原ガラスの状態では、３５〜５５×
１０-7／℃であった熱膨張係数が１０〜２５×１０-7／
℃という低い熱膨張係数を有する耐熱性に優れた透明結
晶化ガラスの前面ガラスとなる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) The front glass of this embodiment has an oxide composition of SiO 2 58-70.
%, Al 2 O 3 18~25% , Li 2 O 0.5~5
%, Na 2 O 0~2%, K 2 O 0~2%, MgO 1
~ 5%, CaO 0 ~ 0.3%, BaO 0.1 ~ 2%,
ZnO 0.1~7%, TiO 2 0.1~7% , Zr
O 2 0.5 to 7% and Sb 2 O 3 0.1~2.5%
And raw glass that contains, or is a plus P 2 O 5 0 to 3 wt% or B 2 O 3 0 to 3 wt% in addition to the composition as the base glass. Then, the raw glass is melted, formed into a front glass by press molding or the like, gradually cooled, and then subjected to primary heat treatment to generate crystal nuclei. Next, a second heat treatment is performed at a temperature higher than the crystal nucleation temperature to precipitate a β-quartz solid solution having a crystal grain size of 400 nm or less as a main crystal. In the state of the original glass due to the precipitation of the crystals, 35 to 55 ×
The coefficient of thermal expansion of 10 −7 / ° C. was 10 to 25 × 10 −7 /
It becomes a front glass of a transparent crystallized glass having a low coefficient of thermal expansion of as low as ° C. and excellent in heat resistance.

【００２２】（実施の形態２）この実施の形態の前面ガ
ラスは、酸化物換算でＳｉＯ2 ５８〜７０％、Ａｌ2Ｏ
3 １８〜２５％、Ｌｉ2Ｏ ０．５〜５％、Ｎａ2Ｏ
０〜２％、Ｋ2Ｏ ０〜２％、ＭｇＯ １〜５％、Ｃａ
Ｏ ０〜０．３％、ＢａＯ０．１〜２％、ＺｎＯ ０．
１〜７％、ＴｉＯ2 ０．１〜７％、ＺｒＯ2 ０．５〜
７％、Ｓｂ2Ｏ3 ０．１〜２．５％を含有し、かつフッ
素（Ｆ）を０．０１〜３％を含有したものを原ガラスと
する、または、この組成の他にＰ2Ｏ5 ０〜３質量％も
しくはＢ2Ｏ3 ０〜３質量％を加えたものを原ガラスと
する。そして、この原ガラスを上記実施の形態１と同様
に溶融し、結晶粒径４００ｎｍ以下のβ−石英固溶体を
析出させる。この結晶の析出により原ガラスの状態で
は、３５〜５５×１０-7／℃であった熱膨張係数が１０
〜２５×１０-7／℃という低い熱膨張係数を有する耐熱
性に優れた透明結晶化ガラスの前面ガラスとなる。(Embodiment 2) The front glass according to this embodiment has an oxide equivalent of 58 to 70% of SiO 2 and Al 2 O
3 18~25%, Li 2 O 0.5~5 %, Na 2 O
0~2%, K 2 O 0~2% , MgO 1~5%, Ca
O 0-0.3%, BaO 0.1-2%, ZnO 0.
1~7%, TiO 2 0.1~7%, ZrO 2 0.5~
7%, contain Sb 2 O 3 0.1 to 2.5% and to those fluorine (F) containing 0.01% to 3% and the base glass, or, P 2 in addition to the composition O 5 0 to 3 wt% or B 2 O 3 0-3% by weight of the base glass plus. Then, the raw glass is melted in the same manner as in the first embodiment to precipitate a β-quartz solid solution having a crystal grain size of 400 nm or less. Due to the precipitation of the crystals, the coefficient of thermal expansion of 35 to 55 × 10 −7 / ° C. in the state of the original glass becomes 10
It becomes a front glass of a transparent crystallized glass having a low coefficient of thermal expansion of about 25 × 10 −7 / ° C. and excellent in heat resistance.

【００２３】上記したそれぞれの実施の形態の前面ガラ
スの７６０〜２５００ｎｍの赤外域の平行透過率は、７
５％以上であり前面ガラスの温度上昇を招く赤外線を効
率よく透過させることができる。The parallel transmittance of the front glass of each of the above embodiments in the infrared region of 760 to 2500 nm is 7
It is 5% or more, and it is possible to efficiently transmit infrared rays that cause the temperature of the front glass to rise.

【００２４】本発明にかかる透明結晶化ガラスは作業点
が低く、成形性に優れるため、金型設計に忠実な成形精
度が得られ、成形後の加工を含めた生産性向上が可能で
ある。The transparent crystallized glass according to the present invention has a low work point and is excellent in moldability, so that molding accuracy faithful to mold design can be obtained, and productivity including processing after molding can be improved.

【００２５】[0025]

【実施例】本発明の実施例を表１に示す。EXAMPLES Examples of the present invention are shown in Table 1.

【表１】 [Table 1]

【００２６】（実施例１）前面ガラスの酸化物組成をＳ
ｉＯ2 ６０．７％、Ａｌ2Ｏ3 ２０．６％、Ｌｉ2Ｏ
２％、ＭｇＯ ２．９％、ＺｎＯ １．５％、ＴｉＯ2
３．４％、ＺｒＯ2 ２．４％、ＢａＯ １％、Ｎａ2
Ｏ ０．５％、Ｋ2Ｏ ０．５％、ＣａＯ ０．１％、
Ｓｂ2Ｏ3 １．５％およびＰ2Ｏ5 ２．９％を含む原ガ
ラスとなるように原料を調合する。そして、調合した原
料を１５００℃で溶融しガラス化させた後に、プレス成
型により前面ガラスを形成し徐冷する。そして、この前
面ガラスを常温から毎分１０℃の昇温速度で７５０℃ま
で昇温し、７５０℃で２時間保持する１次熱処理で結晶
核の生成を行う。その後、毎分１０℃の昇温速度で８５
０℃まで昇温し、８５０℃で２時間保持する２次熱処理
で結晶を析出させ、毎分２℃の降温速度で冷却し、得ら
れた前面ガラスは透明であった。また、このガラスは構
成成分のＳｉＯ2とＡｌ2Ｏ3とを合量で８１．３％含む
ため、１２４８℃で１０3.0Ｐａ・ｓ、１６５９℃で１
０1.0Ｐａ・ｓとなるので、作業点が１０５０℃近傍と
なり、ガラスが冷めやすくなる傾向がある。しかし、保
温対策等をすることにより、タンク炉での連続プレス成
形が可能となる。Example 1 The oxide composition of the front glass was changed to S
iO 2 60.7%, Al 2 O 3 20.6%, Li 2 O
2%, MgO 2.9%, ZnO 1.5%, TiO 2
3.4%, ZrO 2 2.4%, BaO 1%, Na 2
O 0.5%, K 2 O 0.5%, CaO 0.1%,
The raw materials are prepared so as to become a raw glass containing 1.5% of Sb 2 O 3 and 2.9% of P 2 O 5 . Then, after the prepared raw material is melted and vitrified at 1500 ° C., a front glass is formed by press molding, and is gradually cooled. Then, the front glass is heated from normal temperature to 750 ° C. at a rate of 10 ° C./minute, and crystal nuclei are generated by a first heat treatment maintained at 750 ° C. for 2 hours. Then, at a rate of 10 ° C./min.
The temperature was raised to 0 ° C., crystals were precipitated by a second heat treatment maintained at 850 ° C. for 2 hours, and cooled at a rate of 2 ° C./min, and the obtained front glass was transparent. Also, in this order glass containing 81.3% of the SiO 2 and Al 2 O 3 components in total, 10 3.0 Pa · s, 1659 ℃ at 1248 ° C. 1
Since it is 0 1.0 Pa · s, the working point is near 1050 ° C., and the glass tends to be easily cooled. However, continuous press molding in a tank furnace becomes possible by taking measures such as heat retention.

【００２７】この前面ガラスをＸ線回折装置により分析
したところ回折パターンから、β−石英固溶体が主結晶
として析出されていた。また、β−石英固溶体の結晶粒
径を走査型電子顕微鏡により観察したところ、最大の結
晶粒径のものでも１００ｎｍを越えるものは見られなか
った。熱膨脹係数（５０−２５０℃）は、結晶化前４１
×１０-7／℃であったものが、結晶化後２０×１０-7／
℃となり、耐熱衝撃性は６００℃以上を示した。When this front glass was analyzed by an X-ray diffractometer, a β-quartz solid solution was precipitated as a main crystal from the diffraction pattern. Further, when the crystal grain size of the β-quartz solid solution was observed by a scanning electron microscope, it was found that the largest crystal grain size did not exceed 100 nm. The coefficient of thermal expansion (50-250 ° C) is 41 before crystallization.
× 10 -7 / those was ℃ is crystallized after 20 × 10 -7 /
° C, and the thermal shock resistance was 600 ° C or higher.

【００２８】なお、耐熱衝撃性の評価は電気炉で１時間
所定温度加熱した後、３０℃以下の水中に投入、急冷し
た際に破損、クラックが生じたか否かを判断することで
行った。本実施例では電気炉の温度を６００℃としても
前面ガラスに破損およびクラックが発生しなかったもの
である。The thermal shock resistance was evaluated by heating at a predetermined temperature in an electric furnace for 1 hour, throwing it into water at 30 ° C. or lower, and judging whether or not breakage or cracking occurred upon rapid cooling. In this embodiment, no damage or cracks occurred in the front glass even when the temperature of the electric furnace was set to 600 ° C.

【００２９】また、前面ガラスを１ｍｍ厚にスライス、
研磨した後、分光光度計を用いて平行透過率を測定した
ところ、７６０〜２５００ｎｍの波長範囲で８５％以上
の透過率を有していた（図１参照）。Further, the front glass is sliced to a thickness of 1 mm,
After polishing, the parallel transmittance was measured using a spectrophotometer. As a result, the transmittance was 85% or more in the wavelength range of 760 to 2500 nm (see FIG. 1).

【００３０】（実施例２）前面ガラスの酸化物組成をＳ
ｉＯ2 ６５．７％、Ａｌ2Ｏ3 １９．６％、Ｌｉ2Ｏ
２．９％、ＭｇＯ ２％、ＺｎＯ １％、ＴｉＯ2
２．５％、ＺｒＯ2 １．５％、ＢａＯ ０．５％、Ｎ
ａ2Ｏ ０．２％、Ｋ2Ｏ ０．２％、ＣａＯ ０．１
％、Ｂ2Ｏ3 ２．９％およびＳｂ2Ｏ3 １％を含む原ガ
ラスとなるように原料を調合する。そして、調合した原
料を１５５０℃で溶融しガラス化させた後に、プレス成
型により前面ガラスを形成し徐冷する。そして、この前
面ガラスを常温から毎分２０℃の昇温速度で７００℃ま
で昇温し、７００℃で１時間保持する１次熱処理で結晶
核の生成を行う。その後、毎分２０℃の昇温速度で８０
０℃まで昇温し、８００℃で１時間保持する２次熱処理
で結晶を析出させ、毎分２℃の降温速度で冷却し、得ら
れた前面ガラスは透明であった。また、このガラスは構
成成分のＳｉＯ2とＡｌ2Ｏ3とを合量で８５．３％含む
ため、１２３９℃で１０3.0Ｐａ・ｓ、１６４８℃で１
０1.0Ｐａ・ｓとなるので、作業点が１０５０℃近傍と
なり、ガラスが冷めやすくなる傾向がある。しかし、保
温対策等ををすることにより、タンク炉での連続プレス
成形が可能となる。Example 2 The oxide composition of the front glass was S
iO 2 65.7%, Al 2 O 3 19.6%, Li 2 O
2.9%, MgO 2%, ZnO 1%, TiO 2
2.5%, ZrO 2 1.5%, BaO 0.5%, N
a 2 O 0.2%, K 2 O 0.2%, CaO 0.1
%, To formulate raw material such that the raw glass containing 2 O 3 2.9% and Sb 2 O 3 1% B. Then, the prepared raw material is melted and vitrified at 1550 ° C., and then front glass is formed by press molding and gradually cooled. Then, the temperature of the front glass is raised from normal temperature to 700 ° C. at a rate of 20 ° C./minute, and crystal nuclei are generated by a first heat treatment maintained at 700 ° C. for 1 hour. Then, at a heating rate of 20 ° C./min.
The temperature was raised to 0 ° C., and a crystal was precipitated by a second heat treatment maintained at 800 ° C. for 1 hour, and cooled at a rate of 2 ° C./min., And the obtained front glass was transparent. Also, in this order glass containing 85.3% of the SiO 2 and Al 2 O 3 components in total, 10 3.0 Pa · s, 1648 ℃ at 1239 ° C. 1
Since it is 0 1.0 Pa · s, the working point is near 1050 ° C., and the glass tends to be easily cooled. However, continuous press molding in a tank furnace becomes possible by taking measures such as heat retention.

【００３１】この前面ガラスをＸ線回折装置により分析
したところ回折パターンから、β−石英固溶体が主結晶
として析出されていた。また、β−石英固溶体の結晶粒
径を走査型電子顕微鏡により観察したところ、最大の結
晶粒径のものでも１００ｎｍを越えるものは見られなか
った。熱膨脹係数（５０−２５０℃）は、結晶化前３７
×１０-7／℃であったものが、結晶化後１８×１０-7／
℃となり、耐熱衝撃性は６００℃以上を示した。When the front glass was analyzed by an X-ray diffractometer, a β-quartz solid solution was precipitated as a main crystal from the diffraction pattern. Further, when the crystal grain size of the β-quartz solid solution was observed by a scanning electron microscope, it was found that the largest crystal grain size did not exceed 100 nm. The coefficient of thermal expansion (50-250 ° C) is 37 before crystallization.
× 10 -7 / those was ℃ is crystallized after 18 × 10 -7 /
° C, and the thermal shock resistance was 600 ° C or higher.

【００３２】なお、耐熱衝撃性の評価は電気炉で１時間
所定温度加熱した後、３０℃以下の水中に投入、急冷し
た際に破損、クラックが生じたか否かを判断することで
行った。本実施例では電気炉の温度を６００℃としても
前面ガラスに破損およびクラックが発生しなかったもの
である。The thermal shock resistance was evaluated by heating at a predetermined temperature in an electric furnace for 1 hour, then throwing into water at 30 ° C. or lower, and judging whether or not breakage or cracks occurred upon rapid cooling. In this embodiment, no damage or cracks occurred in the front glass even when the temperature of the electric furnace was set to 600 ° C.

【００３３】また、前面ガラスを１ｍｍ厚にスライス、
研磨した後、分光光度計を用いて平行透過率を測定した
ところ、７６０〜２５００ｎｍの波長範囲で８０％以上
の透過率を有していた。Further, the front glass is sliced to a thickness of 1 mm,
After polishing, the parallel transmittance was measured using a spectrophotometer. As a result, the transmittance was 80% or more in the wavelength range of 760 to 2500 nm.

【００３４】（実施例３）前面ガラスの組成が酸化物換
算でＳｉＯ2 ６２％、Ａｌ2Ｏ3２１．５％、Ｌｉ2Ｏ
２．５％、ＭｇＯ ３．５％、ＺｎＯ ２％、ＴｉＯ2
３％、ＺｒＯ2 ０．４％、ＢａＯ １％、Ｎａ2Ｏ １
％、Ｋ2Ｏ ０．５％、ＣａＯ ０．１％、Ｓｂ2Ｏ3
０．５％、Ｐ2Ｏ5 １％、Ｂ2Ｏ3 １％を含有し、かつ
フッ素（Ｆ）０．０３％を含む原ガラスとなるように原
料を調合する。そして、調合した原料を１５５０℃で溶
融しガラス化させた後に、プレス成型により前面ガラス
を形成し徐冷する。そして、この前面ガラスを常温から
毎分１０℃の昇温速度で６５０℃まで昇温し、６５０℃
で２時間保持する１次熱処理で結晶核の生成を行う。そ
の後、毎分１０℃の昇温速度で７５０℃まで昇温し、７
５０℃で２時間保持する２次熱処理で結晶を析出させ、
毎分２℃の降温速度で冷却し、得られた前面ガラスは透
明であった。また、このガラスは構成元素のＳｉＯ2と
Ａｌ2Ｏ3とを合量で８３．５％含むが、フッ素（Ｆ）を
含有させているため、１２４８℃で１０3.0Ｐａ・ｓ、
１５５０℃で１０1.0Ｐａ・ｓとなるので、作業点が１
０００℃近傍となり、ガラスが冷めることなくプレス成
形を行うことができ、プレス金型への負担が軽くタンク
炉での連続成形が可能である。したがって、生産性の向
上を図ることができる。Example 3 The composition of the front glass was 62% SiO 2 , 21.5% Al 2 O 3 and Li 2 O in terms of oxide.
2.5%, MgO 3.5%, ZnO 2%, TiO 2
3%, ZrO 2 0.4%, BaO 1%, Na 2 O 1
%, K 2 O 0.5%, CaO 0.1%, Sb 2 O 3
Raw materials are prepared so as to be a raw glass containing 0.5%, 1% of P 2 O 5 and 1% of B 2 O 3 and containing 0.03% of fluorine (F). Then, the prepared raw material is melted and vitrified at 1550 ° C., and then front glass is formed by press molding and gradually cooled. Then, the temperature of the front glass is raised from ordinary temperature to 650 ° C. at a rate of 10 ° C./min.
A crystal nucleus is generated by primary heat treatment held for 2 hours. Thereafter, the temperature was raised to 750 ° C. at a rate of 10 ° C./min.
Crystals are precipitated by secondary heat treatment maintained at 50 ° C. for 2 hours,
Cooling was performed at a cooling rate of 2 ° C. per minute, and the obtained front glass was transparent. Although the glass comprises 83.5% of the SiO 2 and Al 2 O 3 constituent elements in total, since by containing fluorine (F), 1248 ° C. at 10 3.0 Pa · s,
At 1550 ° C, the working point is 10 1.0 Pa · s.
Since the temperature is around 000 ° C., press molding can be performed without cooling the glass, and the load on the press mold is light, and continuous molding in a tank furnace is possible. Therefore, productivity can be improved.

【００３５】この前面ガラスをＸ線回折装置により分析
したところ回折パターンから、β−石英固溶体が主結晶
として析出されていた。また、β−石英固溶体の結晶粒
径を走査型電子顕微鏡により観察したところ、最大の結
晶粒径のものでも１００ｎｍを越えるものは見られなか
った。熱膨脹係数（５０−２５０℃）は、結晶化前４１
×１０-7／℃であったものが、結晶化後２０×１０-7／
℃となり、耐熱衝撃性は６００℃以上を示した。When this front glass was analyzed by an X-ray diffractometer, a β-quartz solid solution was precipitated as a main crystal from the diffraction pattern. Further, when the crystal grain size of the β-quartz solid solution was observed by a scanning electron microscope, it was found that the largest crystal grain size did not exceed 100 nm. The coefficient of thermal expansion (50-250 ° C) is 41 before crystallization.
× 10 -7 / those was ℃ is crystallized after 20 × 10 -7 /
° C, and the thermal shock resistance was 600 ° C or higher.

【００３６】なお、耐熱衝撃性の評価は電気炉で１時間
所定温度加熱した後、３０℃以下の水中に投入、急冷し
た際に破損、クラックが生じたか否かを判断することで
行った。本実施例では電気炉の温度を６００℃としても
前面ガラスに破損およびクラックが発生しなかったもの
である。The thermal shock resistance was evaluated by heating at a predetermined temperature in an electric furnace for 1 hour, then throwing into water at 30 ° C. or lower, and judging whether or not breakage or cracks occurred upon rapid cooling. In this embodiment, no damage or cracks occurred in the front glass even when the temperature of the electric furnace was set to 600 ° C.

【００３７】また、前面ガラスを１ｍｍ厚にスライス、
研磨した後、分光光度計を用いて平行透過率を測定した
ところ、７６０〜２５００ｎｍの波長範囲で８２％以上
の透過率を有していた（図２参照）。Further, the front glass is sliced to a thickness of 1 mm,
After polishing, the parallel transmittance was measured using a spectrophotometer. As a result, the transmittance was 82% or more in the wavelength range of 760 to 2500 nm (see FIG. 2).

【００３８】（実施例４）前面ガラスの組成が酸化物換
算でＳｉＯ2 ６４．１％、Ａｌ2Ｏ 3 ２１．２％、Ｌ
ｉ2Ｏ ３％、ＭｇＯ ２％、ＺｎＯ １％、ＴｉＯ2
２．５％、ＺｒＯ2 １．５％、ＢａＯ ０．５％、Ｎ
ａ2Ｏ ０．１％、ＣａＯ ０．１％、Ｓｂ2Ｏ3 １．
５％、Ｐ2Ｏ5 ２％、Ｂ2Ｏ3 ０．５％を含有し、かつ
フッ素（Ｆ）０．５％を含む原ガラスとなるように原料
を調合する。そして、調合した原料を１５５０℃で溶融
しガラス化させた後に、プレス成型により前面ガラスを
形成し徐冷する。そして、この前面ガラスを常温から毎
分２０℃の昇温速度で７００℃まで昇温し、７００℃で
１時間保持する１次熱処理で結晶核の生成を行う。その
後、毎分２０℃の昇温速度で８００℃まで昇温し、８０
０℃で１時間保持する２次熱処理で結晶を析出させ、毎
分２℃の降温速度で冷却し、得られた前面ガラスは透明
であった。また、このガラスは構成元素のＳｉＯ2とＡ
ｌ2Ｏ 3とを合量で８５．３％含むが、フッ素（Ｆ）を含
有させているため、１２３２℃で１０3.0Ｐａ・ｓ、１
５８９℃で１０1.0Ｐａ・ｓとなるので、作業点が１０
００℃近傍となり、ガラスが冷めることなくプレス成形
を行うことができ、プレス金型への負担が軽くタンク炉
での連続成形が可能である。したがって、生産性の向上
を図ることができる。Example 4 The composition of the front glass was changed to oxide.
By calculation SiOTwo 64.1%, AlTwoO Three 21.2%, L
iTwoO 3%, MgO 2%, ZnO 1%, TiOTwo 
2.5%, ZrOTwo 1.5%, BaO 0.5%, N
aTwoO 0.1%, CaO 0.1%, SbTwoOThree 1.
5%, PTwoOFive 2%, BTwoOThree Contains 0.5%, and
Raw materials to become raw glass containing 0.5% fluorine (F)
To mix. And melt the blended material at 1550 ° C
After the vitrification, the front glass is
Form and cool slowly. Then, remove this front glass from normal temperature
The temperature is raised to 700 ° C at a heating rate of 20 ° C for
Crystal nuclei are generated by primary heat treatment for one hour. That
Thereafter, the temperature was raised to 800 ° C. at a rate of 20 ° C. per minute,
Crystals are precipitated by a second heat treatment maintained at 0 ° C. for 1 hour.
Cooled at a cooling rate of 2 ° C per minute, the resulting front glass is transparent
Met. This glass is composed of SiO 2 as a constituent element.TwoAnd A
lTwoO ThreeAnd 85.3% in total, but containing fluorine (F).
1032 at 1232 ° C3.0Pa · s, 1
10 at 589 ° C1.0The working point is 10
It is around 00 ° C and press forming without cooling the glass
Can be carried out, the burden on the press mold is light and the tank furnace
Continuous molding is possible. Therefore, increased productivity
Can be achieved.

【００３９】この前面ガラスをＸ線回折装置により分析
したところ回折パターンから、β−石英固溶体が主結晶
として析出されていた。また、β−石英固溶体の結晶粒
径を走査型電子顕微鏡により観察したところ、最大の結
晶粒径のものでも１００ｎｍを越えるものは見られなか
った。熱膨脹係数（５０−２５０℃）は、結晶化前３７
×１０-7／℃であったものが、結晶化後１６×１０-7／
℃となり、耐熱衝撃性は６００℃以上を示した。When this front glass was analyzed by an X-ray diffractometer, a β-quartz solid solution was precipitated as a main crystal from the diffraction pattern. Further, when the crystal grain size of the β-quartz solid solution was observed by a scanning electron microscope, it was found that the largest crystal grain size did not exceed 100 nm. The coefficient of thermal expansion (50-250 ° C) is 37 before crystallization.
× 10 -7 / what was ℃ is crystallized after 16 × 10 -7 /
° C, and the thermal shock resistance was 600 ° C or higher.

【００４０】なお、耐熱衝撃性の評価は電気炉で１時間
所定温度加熱した後、３０℃以下の水中に投入、急冷し
た際に破損、クラックが生じたか否かを判断することで
行った。本実施例では電気炉の温度を６００℃としても
前面ガラスに破損およびクラックが発生しなかったもの
である。The thermal shock resistance was evaluated by heating at a predetermined temperature in an electric furnace for 1 hour, then throwing into water at 30 ° C. or lower, and judging whether or not breakage or cracks occurred upon rapid cooling. In this embodiment, no damage or cracks occurred in the front glass even when the temperature of the electric furnace was set to 600 ° C.

【００４１】また、前面ガラスを１ｍｍ厚にスライス、
研磨した後、分光光度計を用いて平行透過率を測定した
ところ、７６０〜２５００ｎｍの波長範囲で７８％以上
の透過率を有していた。Further, the front glass is sliced to a thickness of 1 mm,
After polishing, the parallel transmittance was measured using a spectrophotometer. As a result, the transmittance was 78% or more in the wavelength range of 760 to 2500 nm.

【００４２】さらに、フッ素（Ｆ）をガラス中に１％、
２％含有したものを実施例５および６として表１中に示
した。これら実施例は上記した実施例４と同様な条件
で、ガラスを溶融し、結晶を析出させたものであり、構
成元素にＳｉＯ2とＡｌ2Ｏ3とを合量で８３．４％、８
４％含有しているが、フッ素（Ｆ）を１％、２％含有し
ているので、成形性は良好であった。また、結晶化後の
熱膨張係数が１８×１０ -7／℃、２２×１０-7／℃とな
り、耐熱衝撃性は６００℃以上を示した。Further, 1% of fluorine (F) is contained in the glass,
Those containing 2% are shown in Table 1 as Examples 5 and 6.
did. These embodiments have the same conditions as those of the above-described fourth embodiment.
In this, the glass is melted to precipitate crystals,
SiO as a constituent elementTwoAnd AlTwoOThree83.4% in total, 8
Contains 4%, but contains 1% and 2% of fluorine (F)
Therefore, the moldability was good. Also, after crystallization
Thermal expansion coefficient is 18 × 10 -7/ ° C, 22 × 10-7/ ℃
The thermal shock resistance was 600 ° C. or higher.

【００４３】（比較例１）前面ガラスの酸化物組成をＳ
ｉＯ2 ５３％、Ａｌ2Ｏ3 ２１％、Ｌｉ2Ｏ ２％、Ｍ
ｇＯ ５％、ＺｎＯ ４％、ＴｉＯ2 ４％、ＺｒＯ2
４％、ＢａＯ ３％、Ｎａ2Ｏ ２％、Ｋ2Ｏ １％、Ｃ
ａＯ ０．１％およびＳｂ 2Ｏ3 １．５％を含む原ガラ
スとなるように原料を調合する。そして、調合した原料
を１５５０℃で溶融しガラス化させた後に、プレス成型
により前面ガラスを形成し徐冷する。そして、この前面
ガラスを常温から毎分１５℃の昇温速度で７５０℃まで
昇温し、７５０℃で１時間保持する１次熱処理で結晶核
の生成を行う。その後、毎分１５℃の昇温速度で８５０
℃まで昇温し、８５０℃で１時間保持する２次熱処理で
結晶を析出させ、毎分２℃の降温速度で冷却し、得られ
た前面ガラスは乳白色であった。(Comparative Example 1) The oxide composition of the front glass was S
iOTwo 53%, AlTwoOThree 21%, LiTwoO 2%, M
gO 5%, ZnO 4%, TiOTwo 4%, ZrOTwo 
4%, BaO 3%, NaTwoO 2%, KTwoO 1%, C
aO 0.1% and Sb TwoOThree Original gala containing 1.5%
Mix the raw materials so that And the prepared ingredients
After being melted and vitrified at 1550 ° C, press molding
To form a front glass and cool slowly. And this front
Glass from normal temperature to 750 ° C at a rate of 15 ° C / min
Crystal nuclei by primary heat treatment of raising temperature and holding at 750 ° C for 1 hour
Is generated. Thereafter, the temperature was raised to 850 at a rate of 15 ° C.
Temperature to 850 ° C and hold at 850 ° C for 1 hour
Crystals are precipitated and cooled at a rate of 2 ° C./min.
The front glass was milky white.

【００４４】この前面ガラスをＸ線回折装置により分析
したところ回折パターンから、β−石英固溶体が主結晶
として析出されていたが、この結晶粒径を走査型電子顕
微鏡により観察したところ、結晶粒径のほとんどが４０
０ｎｍを越えていた。熱膨脹係数（５０−２５０℃）
は、結晶化前３８×１０-7／℃であったものが、結晶化
後２６×１０-7／℃となり、耐熱衝撃性は５００℃以上
を示した。When the front glass was analyzed by an X-ray diffractometer, a β-quartz solid solution was precipitated as a main crystal from the diffraction pattern. The crystal grain size was observed by a scanning electron microscope. Most of the 40
It exceeded 0 nm. Thermal expansion coefficient (50-250 ° C)
Was 38 × 10 −7 / ° C. before crystallization, but became 26 × 10 −7 / ° C. after crystallization, and showed a thermal shock resistance of 500 ° C. or more.

【００４５】また、前面ガラスを１ｍｍ厚にスライス、
研磨した後、分光光度計を用いて平行透過率を測定した
ところ、７６０〜２５００ｎｍの波長範囲で透過率が７
５％以上を示したのは、約１９８０〜約２１５０ｎｍの
範囲と、約２２３０〜約２４５０ｎｍの範囲だけであっ
た（図３参照）。Further, the front glass is sliced to a thickness of 1 mm,
After polishing, the parallel transmittance was measured using a spectrophotometer. As a result, the transmittance was 7 in the wavelength range of 760 to 2500 nm.
Only the range from about 1980 to about 2150 nm and the range from about 2230 to about 2450 nm showed 5% or more (see FIG. 3).

【００４６】（比較例２）前面ガラスの組成が酸化物換
算でＳｉＯ2 ７０．５％、Ａｌ2Ｏ 3 ２３％、Ｌｉ2Ｏ
１．５％、ＭｇＯ ２％、ＺｎＯ ０．５％、ＴｉＯ
2１％、Ｎａ2Ｏ ０．５％、ＣａＯ ０．１％、Ｓｂ2
Ｏ3 ０．５％、Ｐ2Ｏ5０．２％およびＢ2Ｏ3 ０．２
％を含む原ガラスとなるように原料を調合する。そし
て、調合した原料を１６５０℃で溶融しガラス化させた
後に、プレス成型により前面ガラスを形成し徐冷する。
そして、この前面ガラスを常温から毎分１５℃の昇温速
度で７５０℃まで昇温し、７５０℃で１時間保持する１
次熱処理で結晶核の生成を行う。その後、毎分１５℃の
昇温速度で８５０℃まで昇温し、８５０℃で１時間保持
する２次熱処理で結晶を析出させ、毎分２℃の降温速度
で冷却し、得られた前面ガラスは透明であった。さら
に、このガラスは構成元素のＳｉＯ2とＡｌ2Ｏ3とを合
量で９３．５％含むため、１４５５℃で１０3.0Ｐａ・
ｓとなり、１７００℃で１０1.0Ｐａ・ｓとなるので、
作業点が１２５０℃近傍となり、保温対策等を行っても
プレス成形時の成形性が悪くなり、仮に、タンク炉での
連続成形を行った場合でも、プレス金型に供給するガラ
スの温度が高くなるためプレス金型の寿命が短くなり生
産性も低下してしまう恐れがある。(Comparative Example 2) The composition of the front glass was changed to oxide.
By calculation SiOTwo 70.5%, AlTwoO Three 23%, LiTwoO
 1.5%, MgO 2%, ZnO 0.5%, TiO
Two1%, NaTwoO 0.5%, CaO 0.1%, SbTwo
OThree 0.5%, PTwoOFive0.2% and BTwoOThree 0.2
The raw materials are prepared so as to be raw glass containing%. Soshi
Then, the prepared raw material was melted at 1650 ° C. and vitrified.
After that, the front glass is formed by press molding and cooled slowly.
Then, the front glass is heated at a rate of 15 ° C./min.
Temperature to 750 ° C and hold at 750 ° C for 1 hour 1
Crystal nuclei are generated by the next heat treatment. Then at 15 ° C per minute
The temperature is increased to 850 ° C at the rate of temperature increase and maintained at 850 ° C for 1 hour.
The crystals are precipitated by the secondary heat treatment, and the temperature is reduced at a rate of 2 ° C. per minute
And the obtained front glass was transparent. Further
In addition, this glass is composed of SiO 2TwoAnd AlTwoOThreeAnd
103.5 at 1455 ° C to contain 93.5% by volume.3.0Pa ・
s and 10 at 1700 ° C1.0Pa · s,
The working point is around 1250 ° C, so even if you take measures to keep warm
Moldability during press molding deteriorates, and if the
Even if continuous molding is performed, the glass supplied to the press die
The service life of the press die is shortened due to the
Productivity may also be reduced.

【００４７】以上で説明した実施例のガラスは、図１及
び２からもわかるように、可視域の光も良好にとうかす
るので、赤外線のみを利用する照明器具に限らず、一般
の照明器具にも利用することが可能である。また、前面
ガラスの内面又は外面に赤外線のみを透過するＴｉＯ2
−ＳｉＯ2多層膜を形成すれば、光源を赤外線のみを照
射する特殊なランプを使用しなくても良くなる。なお、
本発明の前面ガラスは赤外線を効率よく透過するので、
前面ガラスに被覆された多層膜に赤外線による熱負荷が
小さくなるので、膜剥れなどの現象は発生しにくくなっ
ている。As can be seen from FIGS. 1 and 2, the glass of the embodiment described above also favorably emits light in the visible range, so it is not limited to lighting fixtures using only infrared rays, but also general lighting fixtures. It is also possible to use it. In addition, TiO 2 that transmits only infrared rays is provided on the inner or outer surface of the front glass.
By forming the -SiO 2 multilayer film, the light source even better without using a special lamp for irradiating only the infrared rays. In addition,
Since the front glass of the present invention efficiently transmits infrared rays,
Since the thermal load due to infrared rays on the multilayer film coated on the front glass is reduced, phenomena such as film peeling are less likely to occur.

【００４８】[0048]

【発明の効果】 本発明の前面ガラスは透明結晶化ガラ
スを使用しているため、ランプから照射される赤外線を
効率良く透過でき、耐熱衝撃性にも優れているため、赤
外線を利用する照明器具の照明用前面ガラスに好適であ
る。また、光源に用いられるランプの高輝度化、高効率
化に対応できる。EFFECT OF THE INVENTION Since the front glass of the present invention uses transparent crystallized glass, it can efficiently transmit infrared rays emitted from a lamp and has excellent thermal shock resistance. It is suitable for the front glass for lighting. Further, it is possible to cope with higher luminance and higher efficiency of a lamp used as a light source.

【図面の簡単な説明】[Brief description of the drawings]

【図１】 本発明の実施例１の反射基板の透過率曲線で
ある。FIG. 1 is a transmittance curve of a reflective substrate according to Example 1 of the present invention.

【図２】 本発明の実施例３の反射基板の透過率曲線で
ある。FIG. 2 is a transmittance curve of a reflective substrate according to a third embodiment of the present invention.

【図３】 比較例１の反射基板の透過率曲線である。FIG. 3 is a transmittance curve of a reflective substrate of Comparative Example 1.

フロントページの続き Ｆターム(参考） 4G062 AA03 AA11 BB01 BB06 DA06 DB04 DC01 DC02 DC03 DD01 DD02 DD03 DE02 DE03 DF01 EA02 EA03 EB01 EB02 EB03 EC01 EC02 EC03 ED03 EE01 EE02 EF01 EG02 EG03 FA01 FB02 FB03 FC02 FC03 FD01 FE01 FF01 FG01 FH01 FJ01 FK01 FL01 GA01 GB01 GC01 GD01 GE02 GE03 HH01 HH03 HH05 HH07 HH09 HH11 HH13 HH15 HH17 HH20 JJ01 JJ03 JJ04 JJ05 JJ07 JJ10 KK01 KK03 KK05 KK07 KK10 MM24 NN01 NN15 NN29 QQ02 Continued on front page F-term (reference) 4G062 AA03 AA11 BB01 BB06 DA06 DB04 DC01 DC02 DC03 DD01 DD02 DD03 DE02 DE03 DF01 EA02 EA03 EB01 EB02 EB03 EC01 EC02 EC03 ED03 EE01 EE02 EF01 EG02 EG01 FA01 FB02 FB01 FC01 FK01 FL01 GA01 GB01 GC01 GD01 GE02 GE03 HH01 HH03 HH05 HH07 HH09 HH11 HH13 HH15 HH17 HH20 JJ01 JJ03 JJ04 JJ05 JJ07 JJ10 KK01 KK03 KK05 KK07 KK10 MM24 NN01 NN15 NN29 QQ02

Claims (6)

【特許請求の範囲】[Claims] 【請求項１】 質量百分率で、ＳｉＯ2 ５８〜７０
％、Ａｌ2Ｏ3 １８〜２５％、Ｌｉ2Ｏ ０．５〜５
％、Ｎａ2Ｏ ０〜２％、Ｋ2Ｏ ０〜２％、ＭｇＯ１〜
５％、ＣａＯ ０〜０．３％、ＢａＯ ０．１〜２％、
ＺｎＯ ０．１〜７％、ＴｉＯ2 ０．１〜７％、Ｚｒ
Ｏ2 ０．５〜７％およびＳｂ2Ｏ3 ０．１〜２．５％
を含有し、主結晶としてβ−石英固溶体が析出された透
明結晶化ガラスであることを特徴とする照明用前面ガラ
ス。1. The composition according to claim 1, wherein the mass percentage of SiO 2 is 58-70.
%, Al 2 O 3 18~25% , Li 2 O 0.5~5
%, Na 2 O 0~2%, K 2 O 0~2%, MgO1~
5%, CaO 0-0.3%, BaO 0.1-2%,
ZnO 0.1~7%, TiO 2 0.1~7% , Zr
O 2 0.5 to 7% and Sb 2 O 3 0.1~2.5%
And a transparent crystallized glass in which β-quartz solid solution is precipitated as a main crystal. 【請求項２】 ０．０１〜３質量％のフッ素（Ｆ）を含
有することを特徴とする請求項１記載の照明用前面ガラ
ス。2. The front glass for lighting according to claim 1, further comprising 0.01 to 3% by mass of fluorine (F). 【請求項３】 ０〜３質量％のＰ2Ｏ5を含有することを
特徴とする請求項１または２記載の照明用前面ガラス。3. The front glass for lighting according to claim 1, which contains 0 to 3% by mass of P 2 O 5 . 【請求項４】 ０〜３質量％のＢ2Ｏ3を含有することを
特徴とする請求項１または２記載の照明用前面ガラス。4. The front glass for lighting according to claim 1, comprising 0 to 3% by mass of B 2 O 3 . 【請求項５】 前記透明結晶化ガラスの平行透過率が７
６０〜２５００ｎｍの波長範囲に渡って７５％以上の透
過率を有することを特徴とする請求項１ないし４のいず
れか記載の照明用前面ガラス。5. A transparent crystallized glass having a parallel transmittance of 7
The lighting front glass according to any one of claims 1 to 4, having a transmittance of 75% or more over a wavelength range of 60 to 2500 nm. 【請求項６】 前記透明結晶化ガラスの結晶粒径を４０
０ｎｍ以下としたことを特徴とする請求項１ないし５の
いずれか記載の照明用前面ガラス。6. The transparent crystallized glass having a crystal grain size of 40
The lighting front glass according to any one of claims 1 to 5, wherein the thickness is set to 0 nm or less.
JP2000366506A 2000-12-01 2000-12-01 Front glass for illumination Abandoned JP2002173338A (en)

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JP2009500282A (en) * 2005-06-30 2009-01-08 ユーロケラ Preparation of β-quartz and / or β-spodumene glass ceramics, preparation of articles made from such glass ceramics, glass ceramics, glass ceramics thereof and precursor glasses
JP2007197310A (en) * 2005-12-28 2007-08-09 Nippon Electric Glass Co Ltd Crystallized glass, reflection mirror base material and reflection mirror using the same
JP2013532622A (en) * 2010-07-23 2013-08-19 ショット アクチエンゲゼルシャフト Transparent or transparent colored lithium aluminum silicate glass-ceramic material having a suitable coefficient of thermal expansion and use thereof
CN106573825A (en) * 2014-04-29 2017-04-19 尤罗科拉公司 Partially crystallised glass plate
JP2017518947A (en) * 2014-04-29 2017-07-13 ユーロケラ ソシエテ オン ノーム コレクティフ Partially crystalline glass plate
CN106573825B (en) * 2014-04-29 2020-08-21 尤罗科拉公司 Partially crystallized glass sheet
EP3137427B1 (en) 2014-04-29 2021-03-10 Eurokera S.N.C. Partially crystallised glass plate
JP7458388B2 (en) 2018-11-09 2024-03-29 ユーロケラ Transparent β-quartz glass ceramic with low lithium content

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