CN100422100C - Manufacturing method of glass former and optical component, melting glass outflow device and manufacturing device of glass former - Google Patents

Manufacturing method of glass former and optical component, melting glass outflow device and manufacturing device of glass former Download PDF

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CN100422100C
CN100422100C CNB200510127256XA CN200510127256A CN100422100C CN 100422100 C CN100422100 C CN 100422100C CN B200510127256X A CNB200510127256X A CN B200510127256XA CN 200510127256 A CN200510127256 A CN 200510127256A CN 100422100 C CN100422100 C CN 100422100C
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glass
aforementioned
pipe
heating
temperature
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CN1792902A (en
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村上明
坂和博幸
上崎敦司
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Hoya Corp
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Hoya Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

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Abstract

A method for preparing a glass shaped body from molten glass by flowing out of an outflow port arranged on the front end of a pipe; and shaping the glass shaped body formed by optical glass, a molten outflow device applied in the method, and a preparation device for the glass shaped body are provided. A method for preparing an optical element by heating a pre-shaped glass blank, and press molding is provided. A method for preparing an optical element by heating a pre-shaped glass blank, and carrying out precise press molding is provided. The invention provides a method for maintaining an appropriate temperature of the tube and preparing high-quality glass shaped body, a method for preparing an optical element from the glass shaped body obtained by above method, and a molten glass outflow device for preparing the glass shaped body and a device for preparing the glass shaped body.

Description

The manufacture method of glass shaping body and optical element, melten glass flow out the manufacturing installation of device and glass shaping body
Technical field
The present invention relates to a kind of press forming with the manufacture method of glass shaping bodies such as glass blank, make the method for optical element and the melten glass that can use flows out the manufacturing installation of device and glass shaping body in these methods by the glass shaping body that utilizes aforementioned manufacture method to obtain.
Background technology
Make glass from storage found, homogenizing the container of melten glass flow out, come the method for molding glass molding known via the pipe that is connected with container.At this moment, reduce and prevent the devitrification of effusive glass to utilize a heating arrangements will manage the whole method known (spy opens the 2004-203723 communique) that heats for the temperature of the pipe lower end that prevents glass flows outlet place.
Flow out from glass in order to make that to begin till finish the take-off rate of glass certain, the glass liquid level in the melten glass storage receptacle when wishing to make spout height with pipe to be benchmark changes less.For this reason, preferably container bottom is configured to compare enough height, and makes the length sufficiently long of pipe with managing spout.But, in such device, heat the temperature of mobile glass or the condition that viscosity is adjusted into hope in then being difficult to manage with a heating arrangements if will manage integral body.Again,, then can hinder stable glass to flow out, become the reason of the quality reduction of glass if in pipe, there is not heated position.
Usually, as heating means, known have induction heating, methods such as energising heating, indirect heating.For example,, must shed to the outside by the heat of electrodes transfer, so near the temperature that is difficult for guaranteeing managing the spout is suitable near the extraction electrode pipe spout switching under the situation of heating to managing integral body.Relative with it, if then can not produce the problems referred to above by induction heating.
On the other hand, for the temperature of keeping pipe is suitable, the pipe temperature when preferably with thermopair equitemperature transmitter melten glass being flowed out is monitored, and makes feedbacks such as pipe Heating temperature as required.But carrying out under the situation of induction heating managing integral body,, be difficult to the pipe temperature is carried out instrumentation exactly owing to make temperature sensor also be heated by induction heating.
Summary of the invention
Therefore, the object of the present invention is to provide a kind of temperature of holding tube suitable, and on large-duty basis, make the method for high-quality glass shaping body.
And then, the object of the present invention is to provide a kind of melten glass of making the method for optical element and being used to make above-mentioned glass shaping body by the glass shaping body that utilizes aforesaid method to obtain to flow out the manufacturing installation of device and glass shaping body.
Realize the means of above-mentioned purpose, according to the following stated.
[1] a kind of manufacture method of glass shaping body makes melten glass flow out from the spout that is arranged at the pipe front end, and the molding that is shaped and is formed by opticglass is characterized in that,
By the front end in aforementioned tubes rise upper section (hereinafter referred to as " bottom ") around dispose coil, make high-frequency current flow through this coil, to the pipe bottom carry out induction heating,
By connecting at least pair of electrodes on the top of more leaning on than aforementioned tubes bottom upper end and electric current being flow through between this electrode, to the heating of switching on of aforementioned top, and/or, aforementioned top is heated by around the top of more leaning on than aforementioned tubes bottom, disposing heating element, and
Temperature to aforementioned top is monitored, and based on aforementioned monitored results the temperature of pipe is controlled.
[2] a kind of manufacture method of glass shaping body makes melten glass flow out from the spout that is arranged at the pipe front end, and the molding that is shaped and is formed by opticglass is characterized in that,
By the front end in aforementioned tubes rise upper section (hereinafter referred to as " bottom ") around dispose coil, make high-frequency current flow through this coil, to the pipe bottom carry out induction heating,
On the aforementioned tubes bottom, connect at least one electrode,
Connect at least one electrode on the top of more leaning on than upper end, aforementioned tubes bottom,
By between former electrodes, flowing through electric current, the heating of switching on.
[3] as the manufacture method of [2] described glass shaping body, it is characterized in that, the part of the connection electrode of aforementioned tubes bottom be positioned at the aforementioned tubes bottom than central part by the upper part.
[4] as the manufacture method of [2] or [3] described glass shaping body, it is characterized in that, the temperature on aforementioned top is monitored, the temperature of pipe is controlled based on aforementioned monitored results.
[5] as the manufacture method of wantonly 1 the described glass shaping body in [1]～[3], it is characterized in that, isolate the fused glass block of certainweight from effusive melten glass, and the molding of the aforementioned weight that in aforementioned glass block refrigerative process, is shaped.
As the manufacture method of wantonly 1 the described glass shaping body in [1]～[3], it is characterized in that [6] aforementioned molding is the press forming glass blank.
As the manufacture method of [6] described glass shaping body, it is characterized in that [7] aforementioned press forming glass blank is the precise press molding preform.
[8] a kind of manufacture method of optical element, the glass-made performing base is heated and carries out press forming, it is characterized in that, pass through mechanical workout, the press forming that will utilize [6] described method to make is removed with the surface of glass blank, make preform, aforementioned preform is heated and carry out press forming.
[9] a kind of manufacture method of optical element heats and carries out precise press molding to the glass-made performing base,
It is characterized in that [7] the described method of utilization is made aforementioned preform.
[10] a kind of melten glass flows out device, has: the melt glass container of storage melten glass; Be connected, have the pipe of the spout that flows out melten glass at front end with aforementioned container; And the heating unit of heating aforementioned tubes,
It is characterized in that aforementioned heating unit has: the pipe front end is played the induction heater that upper section (hereinafter referred to as " bottom ") carries out induction heating; And be used to contrast aforementioned lower end portion upper end more by the switch on energising heating arrangements of heating of the pipe on top, and
Based on the output signal of temperature sensor, the temperature of aforementioned tubes is controlled from the temperature on the aforementioned top of monitoring.
[11] a kind of melten glass flows out device, has: the melt glass container of storage melten glass; Be connected, have the pipe of the spout that flows out melten glass at front end with aforementioned container; And the heating unit of heating aforementioned tubes,
It is characterized in that aforementioned heating unit has: the pipe front end is played the induction heater that upper section (hereinafter referred to as " bottom ") carries out induction heating; And be configured in than the heating element on every side that more leans on last top on the aforementioned lower end portion, and
Based on the output signal of temperature sensor, the temperature of aforementioned tubes is controlled from the temperature on the aforementioned top of monitoring.
[12] a kind of melten glass flows out device, has: the melt glass container of storage melten glass; Be connected, have the pipe of the spout that flows out melten glass at front end with aforementioned container; And the heating unit of heating aforementioned tubes,
It is characterized in that aforementioned heating unit has: the pipe front end is played the induction heater that upper section (hereinafter referred to as " bottom ") carries out induction heating; Be used for to pipe switch on the heating the energising heating arrangements; With pipe coupling and a plurality of electrodes of being connected with aforementioned energising heating arrangements,
In aforementioned a plurality of electrode, at least one electrode is connected with the aforementioned tubes bottom.
[13] flow out device as [12] described melten glass, it is characterized in that, in aforementioned a plurality of electrodes, the electrode of below be connected to the pipe bottom than central part by the upper part.
[14] flow out device as [12] or [13] described melten glass, it is characterized in that, based on from the upper end, ratio bottom of monitoring aforementioned tubes more by the output signal of the temperature sensor of the temperature on last top, the temperature of aforementioned tubes is controlled.
[15] flow out device as [10] or [11] described melten glass, it is characterized in that, the aforementioned temperature transmitter is the thermopair that disposes contiguously with pipe.
[16] flow out device as [14] described melten glass, it is characterized in that, the aforementioned temperature transmitter is the thermopair that disposes contiguously with pipe.
[17] a kind of manufacturing installation of glass shaping body from the glass shaping body that is shaped from the effusive melten glass of melten glass outflow device, is characterized in that,
Aforementioned melten glass outflow device is wantonly 1 the described device in [10]～[13].
According to the present invention, carry out induction heating by bottom to pipe, and contrast aforementioned lower end portion is more by the switch on heating or utilize the heating element heating or dual-purpose energising heating and utilize the heating of heating element of last top, while heating the outflow of carrying out melten glass, can prevent to manage the reduction of the temperature of front end, on one side and on one side the temperature of control tube integral body suitably makes the melten glass outflow.Its result can go out not have devitrification, high-quality glass shaping body by flowing out forming of glass.
Again, according to the present invention, not heated position can not appear between the part of the part of the energising of pipe heating and induction heating, preferably, the electrode that heats that is used to switch on is drawn from the position of leaving the pipe spout, so can prevent because the situation of coming the thermal conduction of self-electrode that the temperature of spout is reduced.Thus, Yi Bian on one side the temperature of control tube integral body suitably carry out the outflow of melten glass.Its result can go out not have devitrification, high-quality glass shaping body by flowing out forming of glass.
Description of drawings
Fig. 1 is the sketch chart that the melten glass of use among the embodiment 1 flows out device.
Fig. 2 is the sketch chart that the melten glass of use among the embodiment 1 flows out device.
Fig. 3 is the sketch chart that the melten glass of use among the embodiment 1 flows out device.
Fig. 4 is the explanatory view of the shape of the expression foot electrode 11 of drawing from the pipe bottom of Fig. 3.
Fig. 5 is the explanatory view of pipe bottom.
Embodiment
[manufacture method of glass shaping body]
The manufacture method of glass shaping body of the present invention comprises two kinds of schemes, any scheme all is that melten glass is flowed out and the manufacture method of the glass shaping body that formed by opticglass of being shaped from the spout that is arranged at the pipe front end, it is characterized in that, around the front end upper section (bottom) of aforementioned tubes, dispose coil, induction heating is carried out in the pipe bottom by making high-frequency current flow through this coil.
Induction heating is by disposing coil around conducting band, and crossing high-frequency current and produce the heating means that induced current adds heat conductor at this coil midstream.The high frequency of induction heating concentrates on the leading section of the conducting band that has disposed coil around easily.Flow out and under the situation of shaping glass shaping body, the temperature of spout periphery reduces the reason that becomes the glass devitrification at the spout that makes melten glass from the front end that is arranged at pipe.Thus, be suitable for managing the induction heating of heating of bottom front end because can prevent the devitrification of glass, so particularly useful.Therefore, in the present invention, around the pipe bottom, dispose coil and carry out induction heating.Thus, can prevent devitrification and make high-quality glass shaping body.
On the other hand, such as described above, if carry out induction heating, then temperature sensor also is heated and makes the monitoring of temperature become difficult.Therefore, in the present invention, induction heating and other heating means can be made up and the pipe temperature except that the part of induction heating is monitored.
In first manufacture method (hereinafter referred to as " method for making 1 of glass shaping body ") of glass shaping body of the present invention, the top that upper end, pipe bottom by heating with induction heating Billy is more leaned on connects at least pair of electrodes and flow through electric current between this electrode, to the heating of switching on of aforementioned top; And/or by around the top of more leaning on than upper end, aforementioned tubes bottom, disposing heating element, aforementioned top is heated, and the temperature on aforementioned top is monitored, based on aforementioned monitored results the temperature of pipe is controlled.Thus, can be by heating near the melten glass spout of induction heating to the pipe of the reason that becomes devitrification, and the temperature of pipe is monitored.
So-called energising heating is meant by pair of electrodes at least and is connected on the electrical conductor and electric current is flow through between this electrode, utilizes joule heating to make the heating means of above-mentioned conducting band heating.Again, what is called utilizes heating element to heat to be meant utilization for example by flowing through heating element that electric current generates heat the side of heating target thing to be encased, thus the method that heats.
Under the situation of shaping glass shaping body, as previously mentioned, near the temperature reduction the spout can become the reason of devitrification in that melten glass is flowed out from pipe.And then if there is not heated part on pipe, then only the temperature of this part reduces and causes the devitrification of glass, and also hinders the stable outflow of glass.
Therefore, in second manufacture method (hereinafter referred to as " method for making 2 of glass shaping body ") of glass shaping body of the present invention, by induction heating is being connected at least one electrode with coil configuration on pipe bottom on every side, connect at least one electrode on the top of more leaning on than upper end, aforementioned tubes bottom, between former electrodes, flow through electric current, thereby switch on heating.Thus,, melten glass is stably flowed out, make the glass shaping body that does not have devitrification owing to carry out local repetition of the part (below be also referred to as " induction heating portion ") of induction heating and the part of the heating of switching on (below be also referred to as " energising heating part ").
The sketch chart of the pipe bottom of the sensed heating of expression in Fig. 5.In the present invention, so-called pipe bottom is that the pipe front end plays the part of top, for example can be 1/100～1/10 length of the length of pipe, preferably can be 1/80～1/20 length.So-calledly more be meant than the part pipe bottom, that sensed heating is surrounded with coil upper end more by the part of top by last top than upper end, pipe bottom again.
In the method for making 2 of glass shaping body, the connection energising heating of pipe bottom is leaned on top (with reference to Fig. 5) with what the part of electrode was preferably located in the pipe bottom than central part.According to this formation, more than half the length that the electrode of drawing from the part of sensed heating and melten glass spout is equivalent to manage the bottom apart, thereby thereby can avoid heat because the problem of loosing and near the temperature the pipe spout being reduced from electrodes transfer to outside.Again, constitute according to this, the electrode that is connected with induction heating portion is because from being drawn by the radio-frequency coil area surrounded, so the also sensed heating of electrode self, it is lower than proper range also can to prevent to manage near the temperature of spout thus.Again, because induction heating portion repeats partly with the energising heating part, can heat managing whole zone nothing, pipe integral body can remain on proper temperature with omitting.In addition, wish that the electrode that is connected with induction heating portion is drawn out to the outside of aforementioned coil from the upper opening portion of the radio-frequency coil of heating tube bottom.
In the method for making 2 of glass shaping body, preferably with method for making 1 similarly, to monitoring, the temperature of pipe is controlled based on aforementioned monitored results than the temperature on the top more leaned on, pipe bottom, the top promptly more leaned on than induction heating portion.
In the method for making 1,2 of glass shaping body,, can enumerate the method that pipe is contacted with temperature sensor as the method that the temperature on the top of induction heating portion is monitored.In the present invention, for example can control the input of induction heaters such as high frequency induction heater based on the output signal of temperature sensor, the temperature that makes the pipe lower end is in proper range.For example, under the output signal of temperature sensor is shown as situation than the taller temperature of predefined benchmark value, the input to induction heater is reduced, make the temperature of pipe become suitable temperature thereby the temperature of pipe lower end is reduced; Be shown as than benchmark value under the cryogenic situation, the input to induction heater is increased, thereby making the temperature rising of pipe lower end make the temperature of pipe become suitable temperature.In addition, the temperature sensor that uses in the input control of induction heater is if be arranged at induction heating portion, then owing to by radio-frequency coil temperature sensor self also being heated, so be difficult to carry out temperature control accurately.Thus, in the present invention, temperature sensor is configured in the position by top than induction heating portion.The temperature sensor that is used for the input control of induction heater is arranged on than induction heating portion and leans on last top, preferably is arranged on the part near induction heating portion.Its reason is, can be by to monitoring, and induction heater is applied feedback with the temperature of the approaching part of the temperature of induction heating portion, come near the temperature the melten glass spout that can influence devitrification etc. is especially controlled.
Temperature sensor can be arranged at a plurality of positions accordingly with the length of pipe.In the present invention, for example can change and draw a plurality of electrodes to heavens by side from pipe top, and between this electrode, flow through electric current and the heating of switching on, or with the heating element of predetermined length surround pipe top around, and arrange such heating element along the length direction of pipe, thereby heat in the whole zone to pipe top, also can the above-mentioned energising heating of dual-purpose and the heating of heating element.In these cases, when the heating that will manage top is divided into a plurality of section, preferably at each section more than one temperature sensor is set at least.
The control of heating arrangements on pipe top is wished based on the temperature sensor on the position that is arranged at heated pipe or is arranged at the output signal of the temperature sensor at approaching position, aforementioned position to carry out.Heating about pipe top, also under the output signal of temperature sensor is shown as situation than the taller temperature of predefined benchmark value, input signal to energising heating arrangements or heating element is reduced, and the temperature that makes the position by temperature sensor monitors or approach the pipe at aforementioned position reduce; Be shown as than predefined benchmark value under the also cryogenic situation in aforementioned output signal, the input signal to energising heating arrangements or heating element is increased, and the temperature that makes the position by temperature sensor monitors or approach the pipe at aforementioned position rises.
In addition, owing to the temperature of pipe is promptly changed, can control at short notice in the unit time from managing the amount of effusive melten glass by the energising heating.In addition, the temperature of managing each one can be considered that the discharge of internal diameter, the melten glass of kind, the pipe of effusive glass waits and sets.Preferably be recommended in and produce before the glass shaping body, carry out pilot study and listing condition.
As the temperature sensor that uses in the present invention, be preferably the thermopair that response speed is very fast, can carry out temperature measuring exactly.Thermopair is disposed contiguously with pipe carry out the monitoring of temperature.
Again, in the present invention, use known induction heater, energising heating arrangements, heating element in the technical field that glass is made get final product.In the present invention, to the pipe of education and correction for juvenile offenders bottom use as electrical conductor.As such pipe, can use the pipe of metal (comprising alloy) system, preferably use the pipe of platinum alloy system or platinum system.
Energising heating wishes to spread all over that pipe is lateral draws entirely allly with electrode.Such as described above, because the heat of pipe seized by the outside, so, can prevent it only is that the specific lateral temperature of pipe reduces by electrode being made from the structure of the lateral complete all extraction electrodes that are positioned at certain altitude of pipe.In the method for making 2 of glass shaping body, also preferably adopt such scheme during from induction heating portion extraction electrode.At this moment, preferably, the shape of electrode makes and is equivalent to the lateral shape of circular cone, and the part that will be positioned at the summit of circular cone is installed on the pipe, and electrode extends upward from the installation site.Preferably, (position that is equivalent to the bottom surface periphery of circular cone) draws the distribution that is connected with AC power from electrode top.Thus, can not hinder radio-frequency coil and can easily draw the foot electrode from the pipe bottom.In addition, above-mentioned electrode is also preferably made by platinum alloy or platinum is made.
In addition, encase whole pipe side with lagging material, this is preferred on this point in the temperature with pipe remains on suitable scope.Passing through under the situation on heating element heating tube top, available lagging material encases with pipe from the outside with heating element.
As the method for making 1 of above-mentioned glass shaping body and a kind of scheme of method for making 2, following two kinds (being called shaping example 1, shaping example 2) such as manufacture method can be shown, shaping example 1 is for disposing mold below pipe, make from the continuous effusive molten glass flow of aforementioned tube and flow into mold, and the glass that flows at the mold internal shaping, is pulled out the glass shaping body that is shaped from aforementioned mold more continuously; Shaping example 2 is for carrying out the manufacture method of following operation repeatedly: a plurality of shaping dies are transported to the pipe below seriatim, accept isolating fused glass block with the shaping die that is positioned at the aforementioned tubes below, and on aforementioned shaping die, fused glass block is configured as glass shaping body from managing the spout outflow.
In shaping example 1, molten glass flow flows out and flow in the mold from pipe as Continuous Flow.Expanding the melten glass open in mold cools off and is configured as for example writing board shape owing to seized heat by mold.The lateral side opening of mold, on one side the glass that is shaped is pulled out with certain speed along continuous straight runs continuously from this peristome, be configured as the flat board that has certain thickness and width, forms by opticglass on one side.According to the present invention since glass can devitrification, flow in the mold with stable flow rate, so can make thickness even and high-quality, concerning plate glass is shaped the ideal glass shaping body.
In shaping example 2, the situation that becomes Continuous Flow is arranged and become the situation that melten glass drips from managing effusive melten glass.As the effusive situation of Continuous Flow, can be transported to pipe below and at the shaping die of this stop near the pipe lower end, the front end of effusive glass flows is supported with the recess that is arranged on the shaping die, after producing necking part at the front end of molten glass flow and between near the part of pipe, shaping die descended rapidly and make the molten glass flow front end from aforementioned necking section from (do not use and cut off sword), and accept on this recess, by gas the glass block after separating is applied blast, while make its come-up molding glass molding from the ejection of shaping die recess.In this method for making, can be by a plurality of shaping dies be moved molding glass molding seriatim successively as described above.
In the shaping example 2, the operation of carrying out under the situation that the melten glass that drips from pipe drips is identical with aforesaid method, promptly also a plurality of shaping dies is transplanted on successively pipe below and stop herein, accepts melten glass and drip on the stop place.Under the situation of dripping, melten glass drips melten glass by the periphery that is arranged at the shaping die recess and drips continuing surface and accept, in the mode of on aforementioned continuing surface, sliding or roll melten glass is dripped to recess and to guide, with above-mentioned the same, while apply blast and make its come-up be configured as glass shaping body by gas.In shaping example 2, the glass on the shaping die can solidify the back and take out from shaping die on shaping die.
Shaping example 1, shaping example 2 all can be annealed to the glass shaping body that is shaped and be reduced strain.
The method for making 1 of glass shaping body and method for making 2 are owing to can fully heat the bottom of outlet pipe, and the temperature of control tube each several part critically, so wish as following method: isolate the fused glass block of certainweight from effusive melten glass, and the glass shaping body of the aforementioned weight that in aforementioned glass block process of cooling, is shaped.
The method for making 1 of glass shaping body and method for making 2 are suitable for as the manufacture method of press forming with glass blank, preferably, are suitable for as press forming with preform, particularly as the manufacture method of precise press molding with preform.Making press forming with under the situation of glass blank according to above-mentioned shaping example 1, can the glass shaping body that will pull out from mold anneal reduce strain after, be divided into regulation shape and specified dimension and make a plurality of sheet glass, grinding, grinding are implemented in surface to these sheet glass, make the press forming glass blank of predetermined weight.
Making press forming with under the situation of glass blank according to above-mentioned shaping example 2, can directly use with glass blank from the glass shaping body that shaping die takes out as the press forming of predetermined weight, also can be and after reducing strain in the molding annealing that will take out, implement grinding, grinding, the press forming that makes predetermined weight uses with glass blank.Particularly preferably, in shaping example 2, isolate the fused glass block of certainweight, the molding of the aforementioned weight that in aforementioned glass block refrigerative process, is shaped from effusive melten glass.
In addition, so-called " press forming preform " be meant heating, soften voltage supply afterwards makes the glass shaping body that shape is used, and is formed by the glass with the corresponding required weight of weight of press forming product.
Again, so-called " precise press molding preform " is the forming of glass preform of the usefulness of confession under directions precise press molding.Precise press molding is also referred to as moulded optical (モ-Le De オ プ テ イ Network ス) moulding method, is widely known by the people in the technical field under the present invention.The light of optical element is seen through, the face of refraction, diffraction, reflection is called the optical function face.For example, as if being example with lens, then the lens faces such as sphere of the aspheric surface of non-spherical lens and spherical lens are equivalent to the optical function face.The precise press molding method be critically be transferred to by forming face compression forming mould on glass, the method for coming to form the optical function face with press forming.Promptly needn't carry out mechanical workouts such as grinding or grinding for precision work optical function face.
According to the manufacture method of glass shaping body of the present invention, owing to carry out temperature control to managing integral body, so can critically control the discharge of melten glass.Can be certain by the discharge that keeps time per unit exactly, and carry out from managing the separation of effusive melten glass with certain cycle, thereby the higher fused glass block of separable weight precision.This advantage is brought into play great effect in the following cases.
Critically be transferred to heating in forming face with compression forming mould, remollescent is on glass and carry out in the precise press molding of press forming of glass, grinding, the attrition process of press forming product is limited to inferior limit or do not carry out.Do not carrying out under the situation of above-mentioned grinding, attrition process, the weight of glass blank of usefulness that shape is made in voltage supply is consistent with the weight of the optical elements such as lens that obtain by press forming.Again, under the situation of carrying out above-mentioned grinding, attrition process, the excess weight of glass blank can cause when precise press molding glass to enter between the parts that constitute compression forming mould, thereby becomes the reason of shaping flash, hinders good press forming.The under weight of glass blank can become the reason of the lack of fill of the glass in the compression forming mould, and the forming accuracy of press forming product is worsened.Based on such reason, be benchmark with the target weight, require to supply to the weight precision of the glass blank (being called the precise press molding preform) in the precise press molding in tolerance+2%, preferably in ± 1%.The manufacture method of glass shaping body of the present invention is suitable for making the precise press molding preform of above-mentioned requirements higher weight precision.Moreover, because by precise press molding, precise press molding is become the lens face of lens etc. with the surface finishing of preform, so do not allow to exist defective such as devitrification.According to the present invention, owing to, can prevent the devitrification of glass, so can easily make the precise press molding preform of no devitrification by induction heating is carried out in the pipe bottom.
" melten glass flows out the manufacturing installation of device, glass shaping body "
In the manufacture method of glass shaping body of the present invention, can use from the manufacturing installation of the glass shaping body of the glass shaping body that is shaped from the effusive melten glass of melten glass outflow device.Melten glass as the method for making 1 that is used for aforementioned glass shaping body flows out device, and the melten glass that can enumerate following two kinds of schemes flows out device.
(1) a kind of melten glass flows out device (below be also referred to as " bleeder (1) "), has: the melt glass container of storage melten glass; Be connected, have the pipe of the spout that flows out melten glass at front end with aforementioned container; And the heating unit of heating aforementioned tubes,
It is characterized in that aforementioned heating unit has: the induction heater that the top (bottom) of pipe front end is carried out induction heating; Be used to contrast the energising heating arrangements that aforementioned lower end portion upper end more switches on and heats by the pipe on last top, and,
Based on the output signal of temperature sensor, the temperature of aforementioned tubes is controlled from the temperature on the aforementioned top of monitoring.
(2) a kind of melten glass flows out device (below be also referred to as " bleeder (2) "), has: the melt glass container of storage melten glass; Be connected, have the pipe of the spout that flows out melten glass at front end with aforementioned container; And the heating unit of heating aforementioned tubes,
It is characterized in that aforementioned heating unit has: the pipe front end is played the induction heater that upper section (bottom) carries out induction heating; Be configured in the heating element on every side that more leans on last top than the upper end, bottom of aforementioned tubes, and
Based on the output signal of temperature sensor, the temperature of aforementioned tubes is controlled from the temperature on the aforementioned top of monitoring.
Melten glass as the method for making 2 that is used for glass shaping body flows out device, can enumerate following
(3) a kind of melten glass flows out device (below be also referred to as " bleeder (3) "), has: the melt glass container of storage melten glass; Be connected, have the pipe of the spout that flows out melten glass at front end with aforementioned container; And the heating unit of heating aforementioned tubes,
It is characterized in that aforementioned heating unit has: the pipe front end is played the induction heater that upper section (bottom) carries out induction heating; Be used for to pipe switch on the heating the energising heating arrangements; With pipe coupling and a plurality of electrodes of being connected with aforementioned energising heating arrangements,
In aforementioned a plurality of electrodes, at least one electrode is connected with the aforementioned tubes bottom.
In bleeder (3), as the front about as described in the method for making 2 of glass shaping body, in aforementioned a plurality of electrodes, preferably nethermost electrode is connected to leaning on the top of pipe bottom than central part, preferably based on from the ratio bottom upper end of monitoring aforementioned tubes more by the output signal of the temperature sensor of the temperature on last top, the temperature of aforementioned tubes is controlled.
In any one of above-mentioned bleeder (1)～(3), the melt glass container of storage melten glass can use known container, for example can use the platinum alloy container made.The pipe, heating arrangements, monitoring temperature and the temperature that connect said vesse are controlled as previously mentioned.
Above-mentioned melten glass flows out device according to the temperature of pipe, the internal diameter of pipe etc., and can form molten glass flow flows out glass, also can form melten glass and drip the glass that drips from the pipe lower end.
In addition, in order to keep the take-off rate of melten glass certain, wish to make liquid level less with the above-mentioned liquid level change of managing the difference of height between the bottom front end (spout) with respect to aforementioned melten glass with respect to the variation of the liquid level of the melten glass in the melt container.From this point of view, preferably manage difference of height (length that is equivalent to pipe) between top front end and the bottom front end in the scope of 2.0～2.5m.Like this, stably carry out, be necessary to use long pipe, but,, can not make the glass devitrification, can make high-quality glass shaping body even such pipe also can be controlled and make that each temperature of pipe is suitable according to the present invention for the outflow that makes glass.
" manufacture method of optical element "
Then, the manufacture method to optical element of the present invention describes.
First scheme is in the manufacture method of the optical element that the glass-made performing base is heated and carries out press forming, pass through mechanical workout, the press forming that the method for making of utilizing aforementioned glass shaping body of the present invention obtains is removed with the surface of glass blank, make preform, aforementioned preform is heated and carries out the manufacture method of the optical element of press forming.
As the mechanical workout on the surface of removing glass shaping body, can exemplify ground finish, attrition process or grinding and attrition process.Specifically, barreling is comparatively suitable.
This programme is in atmosphere preform to be heated, softens, and uses the compression forming mould press forming to make and the proximate press forming glass blank of optical element.Then, can be after reducing strain in that press forming is annealed with glass blank, press forming is carried out mechanical workouts such as grinding, grinding with the surface of glass blank, use compression forming mould, the preform press forming that for example heats in non-oxidizing atmosphere is made optical element.Only also can make the optical element of hope by mechanical workout again.Method for press forming can use known method.
Alternative plan is characterised in that, in the manufacture method of the optical element that the glass-made performing base is heated and carries out precise press molding, utilizes the method for making of aforementioned glass shaping body of the present invention to make the precise press molding preform.
In this programme, in atmosphere, preform is heated, softens, and use the compression forming mould press forming to make and the proximate precise press molding glass blank of optical element.Then, can make optical element to the preform precise press molding that for example in non-oxidizing atmosphere, heats in that precise press molding after reducing strain, is used compression forming mould with glass blank annealing.Again, the precise press molding method can be used known method.
In the present invention, preferably preform is formed by opticglass.As optical element, the various elements such as prism of non-spherical lens, spherical lens, micro lens, prism, diffraction grating, band lens can routine be shown.
In addition, on the surface of above-mentioned optical element, also can form optical thin films such as antireflection film.
[embodiment]
Below, according to embodiment, the present invention is further specifically described, but the present invention is not limited to these embodiment.
(embodiment 1)
Fig. 1 is that the schematic figure that the melten glass that uses in the present embodiment flows out the device gained is observed in expression from positive side.In the present embodiment, in platinum alloy container made 1, deaeration, the melten glass 2 that has homogenized are keeping being stored under the pyritous state by not shown heating unit.Be connected with the pipe 3 of platinum alloy system in the bottom of container 1, become the melten glass mobile structure in pipe in the container.Length from the upper end (part that is connected with the bottom of container 1) of pipe to bottom front end (spout) is 2.3m, and the height of the molten glass level in from the bottom of container 1 to container is 0.3m.Pipe 3 is by the bottom 3-1 that has glass flows outlet, constitute with the pipe top 3-2 that is connected between bottom and the container 1.Pipe top is divided into 4 sections, is electrically connected from the two ends extraction electrode of each section and with AC power 4, comes managing each section 3-2 energising heating of top 3-2 by making each AC power 4 work.In addition, above-mentioned each electrode adopts platinum alloy system electrode or platinum system electrode to get final product.
On the other hand, the periphery at pipe bottom 3-1 disposes radio-frequency coil 6 in the mode of surrounding pipe.By making high frequency electric source 5 work that are electrically connected with radio-frequency coil 6, bottom 3-1 carries out ratio-frequency heating to pipe.
The mode that contacts with the periphery with each section of managing top 3-2 is provided with thermopair 7, and the pipe temperature of each section is monitored.Again, the mode that contacts with the part with the bottom that is close to pipe upper periphery face is provided with thermopair 7, comes the temperature variation of bottom 3-1 is monitored.Above-mentioned each thermopair is electrically connected with controller 8, controller is based on supervisory signal and the temperature condition that preestablishes each section of input from above-mentioned thermopair, control the output of each AC power 4, the output of high frequency electric source 5, the temperature at each position of pipe is kept suitably.
Be made as section 1, section 2, section 3, section 4 from the top if will manage 4 sections on top, then for example the design temperature of section 1 is made as 1020 ℃, the design temperature of section 2 is made as 1020 ℃, and the design temperature of section 3 is made as 970 ℃, and the design temperature of section 4 is made as 955 ℃.To be made as 955 ℃ with the design temperature of the part of monitoring near the thermopair 7 of the lowest end of managing top again.Under this condition, with the pipe each one temperature be controlled to be necessarily, melten glass 2 is flowed out continuously with certain flow velocity.
Be disposed at a plurality of shaping dies on the turntable by aforementioned the calibration rotation and be transported to seriatim pipe bottom 3-1 under (being called the foundry goods position), carry out following operation repeatedly, from the effusive melten glass glass shaping body that is shaped seriatim.For make stay in the foundry goods position shaping die on aforementioned location with the pipe lower end near making its rising, the lower end of effusive molten glass flow is by the recess supporting that is arranged on the aforementioned shaping die, make molten glass flow the lower end and and the pipe part of joining between produce necking part.After this, on the opportunity of regulation,, and accept on the above-mentioned recess with rapid decline of shaping die and from the molten glass flow (do not use and cut off sword) of aforementioned necking section from the below.Come isolating glass block is applied blast from shaping die recess ejection nitrogen, be shaped glass shaping body while it is floated.Glass on the shaping die is taken out from shaping die after curing.
In addition, the action of control shaping die makes and carries out with some cycles from the separation of managing effusive melten glass.
Like this, can mass production weight precision height, promptly, with respect to the weight of target glass molding weight tolerance ± 1% with interior glass shaping body.On these moldinies, do not observe defectives such as devitrification, brush line.In addition, in the present embodiment, use and contain SiO 2And B 2O 3Glass, contain B 2O 3And La 2O 3Glass, contain SiO 2And TiO 2Various opticglass such as glass, phosphoric acid glass.
Then, use melten glass shown in Figure 2 to flow out device, carry out the outflow of glass and the making of glass shaping body.Device shown in Figure 2 is substantially the same with the device of Fig. 1, but the heating arrangements of not switching on replaces and dispose heating element 9 on the periphery on pipe top.This device also will be managed top and will be divided into 4 sections, and will be the same with the device of Fig. 1, the supervisory signal of the thermopair that disposes contiguously based on pipe periphery with each section, and control supplies to the electric power of heating element.The supervisory signal of thermopair is the same with the device of Fig. 1 to be sent in the controller, and controller control is to the supply capability of the power supply 10 of heating element supply capability.Like this, make the temperature of each one of pipe top remain on design temperature.
The ratio-frequency heating, monitoring temperature of pipe bottom, the feedback control of carrying out to ratio-frequency heating based on supervisory signal are the same with the device of Fig. 1.Like this, same during with the device that uses Fig. 1, the glass shaping body of making high-quality, high weight precision, forming by various opticglass.
Then, use melten glass shown in Figure 3 to flow out device, carry out the outflow of glass and the making of glass shaping body.Device shown in Figure 3 is substantially the same with the device of Fig. 1, but the electrode of the heating that is used for switching on is positioned at the upper opening portion that the electrode 11 (being called the foot electrode) of below passes radio-frequency coil 6, from drawing of pipe bottom, and be connected with AC power 4 from last 1/4 position.The pipe bottom accepts high-frequency induction heating from last 1/4 part, and the heating of also switching on like this.Again, owing to draw the position of foot electrode 11 and about 3/4 of length that spout 3-1 manages the bottom apart, near the temperature of spout 3-1 can not fallen lowly excessively yet.
Fig. 4 is the figure that represents the shape of the foot electrode 11 of drawing from the pipe bottom of Fig. 3 particularly.Foot electrode 11 has the circular cone side is made the shape of summit towards the below, and its apex portion was installed on lateral full week of pipe.From electrode topmost wiring lead, be connected with AC power 4.
This device also will be managed top and will be divided into 4 sections, and will be the same with the device of Fig. 1, the supervisory signal of the thermopair that disposes contiguously based on pipe periphery with each section, and control supplies to the electric power of heating element.The supervisory signal of thermopair is the same with the device of Fig. 1 to be sent in the controller 8, the supply capability of controller 8 control AC power 4.Like this, make the temperature of each one of pipe top remain on design temperature.And foot electrode 11 is also by ratio-frequency heating.
The ratio-frequency heating, monitoring temperature of pipe bottom, the feedback control of carrying out to ratio-frequency heating based on supervisory signal are the same with the device of Fig. 1.Like this, same during with the device that uses Fig. 1, the glass shaping body of making high-quality, high weight precision, forming by various opticglass.
(embodiment 2)
Then, use device (this each device of the device of the device of Fig. 1, the device of Fig. 2, Fig. 3) similarly to Example 1 except that the interior less this point of external diameter of pipe, melten glass drips from the pipe spout, drip continuing surface and accept melten glass and drip with being located at melten glass around the shaping die recess that stays in the foundry goods position, in the mode of on aforementioned continuing surface, sliding or roll melten glass is dripped to recess and to guide, the same with embodiment 1, while apply blast and make its come-up be configured as glass shaping body by gas.
Like this, produce in batches weight precision height, promptly, with respect to the weight of target glass molding weight tolerance ± 1% with interior glass shaping body.On these moldinies, do not observe defectives such as devitrification, brush line.In addition, in the present embodiment, use and contain SiO 2And B 2O 3Glass, contain B 2O 3And La 2O 3Glass, contain SiO 2And TiO 2Various opticglass such as glass, phosphoric acid glass.
(embodiment 3)
Then, under the pipe lower end that is used for the melten glass outflow device of embodiment 1 (device this each device of the device of Fig. 1, the device of Fig. 2, Fig. 3), the mold of the box of an opening in upper surface and 4 sides disposed in the mode of bottom level and fixing, molten glass flow flow in the mold from pipe continuously with certain flow rate.The glass expansion that flows into is reached in the mold whole, and flows to the side surface direction of opening.Seizing hot forming of glass by mold like this is the plate glass that has by the width of the lateral interval determination of mold.The plate glass that is shaped is pulled out from the lateral peristome along continuous straight runs of mold with certain speed, on one side by being annealed on one side in the annealing furnace.
Keep certain owing to flow out the flow velocity of the effusive glass of device by melten glass, if the speed of pulling out of control plate glass makes the melten glass liquid level in the mold keep certain, then can be shaped to have certain thickness plate glass.
On the plate glass molding that is shaped like this, do not observe defectives such as devitrification and brush line.
In addition, in the present embodiment, also use and contain SiO 2And B 2O 3Glass, contain B 2O 3And La 2O 3Glass, contain SiO 2And TiO 2Various opticglass such as glass, phosphoric acid glass.
(embodiment 4)
As preform, heating in nitrogen atmosphere, softening and use compression forming mould to carry out precise press molding is made and is comprised non-spherical lens at interior various optical elements with the glass shaping body made in embodiment 1 and 2.In addition, the compression forming mould that is used for precise press molding uses known shaping die, and the press forming condition is also suitably adjusted in known scope.
Can make the optical element of defectives such as not having devitrification, high-quality, high form accuracy like this.
(embodiment 5)
Then, the glass shaping body of making is carried out barreling in embodiment 1, Powdered releasing agents such as boron nitride are coated on the whole surface equably, heating in atmosphere, softening and use the compression forming mould press forming to be lens shape.Then, in that grinding, grinding are carried out to the surface in press forming product annealing back, be finish-machined to spherical lens.
Can make the optical element of defectives such as not having devitrification, high-quality, high form accuracy like this.
In addition, use known barreling, compression forming mould to get final product, the press forming condition is also suitably adjusted in known scope and is got final product.
(embodiment 6)
Then, the glass shaping body that will make in embodiment 3 cuts into the size of regulation, makes the sheet glass of a plurality of cubics.This sheet glass is carried out barreling, Powdered releasing agents such as boron nitride are coated on the whole surface equably, heating in atmosphere, softening and use the compression forming mould press forming to be lens shape.Then, in that grinding, grinding are carried out to the surface in press forming product annealing back, be finish-machined to spherical lens.
Can make the optical element of defectives such as not having devitrification, high-quality, high form accuracy like this.
In addition, use known barreling, compression forming mould to get final product, the press forming condition is also suitably adjusted in known scope and is got final product.
(embodiment 7)
Then, the glass shaping body that will make in embodiment 3 cuts into the size of regulation, makes the sheet glass of a plurality of cubics.The surface of these sheet glass ground make preform, the various optical elements that comprise non-spherical lens are made in heating in nitrogen atmosphere, softening and use compression forming mould to carry out precise press molding.In addition, the compression forming mould that is used for precise press molding uses known shaping die, and the press forming condition is also suitably adjusted in known scope.
Can make the optical element of defectives such as not having devitrification, high-quality, high form accuracy like this.
(embodiment 8)
Present embodiment has been implemented change to the part of the melten glass outflow device of embodiment shown in Figure 11.Below, only the aspect different with the device of embodiment 1 described.For unaccounted aspect, the same with the manufacture method of the glass shaping body of the use of embodiment 1 device shown in Figure 1 and aforementioned means.
Pipe is made of the pipe top between the bottom that has the glass flows outlet and connection bottom and the container.The pipe bottom is by the charging crane on the following quadrate part that is arranged at pipe top, and loading and unloading are installed on the following quadrate part on pipe top freely.Will manage the bottom be installed to the pipe top following quadrate part on the time, make the endoporus on pipe top consistent exactly with the position of the endoporus of pipe bottom, and the upper surface of the lower surface on pipe top and pipe bottom is butt closely, makes that the mobile melten glass can not spill between pipe top and pipe bottom in pipe.For example, additional nut on the lower end periphery on pipe top, and on the upper periphery of pipe bottom, form thread groove, by above-mentioned nut is screwed in the aforementioned threads groove, carry out of the installation of the bottom of pipe to pipe top, by nut being unclamped and taking off, take off the pipe bottom from above-mentioned thread groove.
The same with embodiment 1, to each section heating of switching on pipe top.On the other hand, on the periphery of pipe bottom, surrounding the mode configuring high-frequency coil of pipe, by making the high frequency electric source work that is electrically connected with radio-frequency coil, and carry out ratio-frequency heating to managing the bottom.
The position of energising heating only limits to manage top, does not flow through to be used to the electric current of switching on and heating between pipe top and pipe bottom.In the device that can load and unload the pipe bottom like this,, then can produce spark discharge on the pipe top and the gap of managing between the bottom sometimes if flow through the electric current of the heating that is used to switch between the bottom with pipe on pipe top.Again, because the resistance between pipe top and the pipe bottom is according to the installation situation change of pipe bottom, so be difficult to make energising to add thermostabilization.
But, owing to as present embodiment, high-frequency induction heating is carried out in the pipe bottom, be used to the electric current of switching on and heating in the pipe bottom with managing not flow through between the top, so can stably heat to managing each position.In the pipe that has charging crane like this, can prepare the different multiple pipe bottom of external diameter or internal orifice dimension in advance, and select suitable pipe bottom to install with matching with the character of effusive glass, each condition such as discharge of glass.
In addition, be fused under the situation of pipe on the top will managing the bottom, though can not produce spark discharge between the two, but owing to change according to the resistance at the different weldings of the method for welding position, so preferably as present embodiment, to the pipe top heating of switching on, carry out high-frequency induction heating to managing the bottom.
Similarly to Example 1, the temperature of managing each position is controlled, melten glass is flowed out continuously with certain flow velocity.
Similarly to Example 1, with be disposed at a plurality of shaping dies on the turntable by aforementioned the calibration rotation and be transported to seriatim the pipe bottom under (being called the foundry goods position), carry out following operation afterwards repeatedly, from the melten glass glass shaping body that is shaped seriatim.For making the shaping die that stays in the foundry goods position on aforementioned location, make its rising near the pipe lower end, the lower end of effusive molten glass flow is by the recess supporting that is arranged on the aforementioned shaping die, the lower end of molten glass flow and and the pipe part of joining between produce necking part.After this, shaping die is descended rapidly and from the molten glass flow (do not use cut off sword) of aforementioned necking section below it on the opportunity of regulation, and accept on the above-mentioned recess.Come isolating glass block is applied blast from shaping die recess ejection nitrogen, Yi Bian make its come-up, Yi Bian the glass shaping body that is shaped.Glass on the shaping die takes out from shaping die after curing.
In addition, the action of control shaping die makes and carries out with certain cycle from the separation of managing effusive melten glass.
Like this, produce in batches weight precision height, promptly, with respect to the weight of target glass molding weight tolerance ± 1% with interior glass shaping body.On these moldinies, do not observe defectives such as devitrification, brush line.In addition, in the present embodiment, use and contain SiO 2And B 2O 3Glass, contain B 2O 3And La 2O 3Glass, contain SiO 2And TiO 2Various opticglass such as glass, phosphoric acid glass.
(embodiment 9)
Then, use melten glass shown in Figure 2 to flow out the device that device has carried out above-mentioned change (change of the charging crane of pipe bottom is set), carry out the outflow of glass embodiment 1.
Similarly to Example 1, be disposed at a plurality of shaping dies on the turntable by aforementioned the calibration rotation and be transported to seriatim the pipe bottom under (foundry goods position), carry out following operation afterwards repeatedly, from the melten glass glass shaping body that is shaped seriatim.For making the shaping die that stays in the foundry goods position on aforementioned location, make its rising near the pipe lower end, the lower end of effusive molten glass flow is by the recess supporting that is arranged on the aforementioned shaping die, the lower end of molten glass flow and and the pipe part of joining between produce necking part.After this, shaping die is descended rapidly and from the molten glass flow (do not use cut off sword) of aforementioned necking section below it on the opportunity of regulation, and accept on the above-mentioned recess.Come isolating glass block is applied blast from shaping die recess ejection nitrogen, Yi Bian make its come-up, Yi Bian the glass shaping body that is shaped.Glass on the shaping die takes out from shaping die after curing.
In addition, the action of control shaping die makes and carries out with certain cycle from the separation of managing effusive melten glass.
Like this, produce in batches weight precision height, promptly, with respect to the weight of target glass molding weight tolerance ± 1% with interior glass shaping body.On these moldinies, do not observe defectives such as devitrification, brush line.In addition, in the present embodiment, use and contain SiO 2And B 2O 3Glass, contain B 2O 3And La 2O 3Glass, contain SiO 2And TiO 2Various opticglass such as glass, phosphoric acid glass.
(embodiment 10)
Then, use melten glass shown in Figure 3 to flow out the glass bleeder that device has carried out change, carry out the outflow of glass and the making of glass shaping body embodiment 1.In the present embodiment, the pipe bottom is divided into two portions.First part is the part that is connected with pipe top, forms with pipe top.Second section is called nozzle, has the glass flows outlet.At the additional charging crane in the lower end of first part, make the upper end loading and unloading of nozzle be installed to the lower end of first part freely by this charging crane.When upper end of nozzle is installed to the lower end of first part, make the endoporus of first part consistent exactly with the position of the endoporus of nozzle, and make the lower surface of first part and upper end of nozzle face butt closely, make that the mobile melten glass can not spill in pipe between first part and nozzle.For example, the nut of the bottom of first part is set, and on the upper periphery of nozzle, forms thread groove, by above-mentioned nut is screwed in the aforementioned threads groove, carry out the installation of nozzle,, take off nozzle by nut being unclamped and taking off from above-mentioned thread groove to first part.
Electrode (being called the foot electrode) below the electrode of the energising heating that is used for pipe is positioned at passes the upper opening portion of radio-frequency coil, from the pipe bottom from last position of 1/4, promptly draw from the lower end of the first part of pipe bottom, and be connected with AC power.Like this, the first part of pipe bottom accepts high-frequency induction heating, and the heating of also switching on.Again, owing to draw the position and the distance of spout at a distance of about nozzle length of foot electrode, so near the temperature the spout can not fallen lowly excessively yet.
In addition, the shape of the foot electrode of drawing from the lower end of first part of pipe bottom is identical with Fig. 4.Other aspects are identical with the explanation of Fig. 3, Fig. 4 of embodiment 1.
And, similarly to Example 1, with be disposed at a plurality of shaping dies on the turntable by aforementioned the calibration rotation and be transported to seriatim the pipe bottom under (foundry goods position), carry out following operation afterwards repeatedly, from the melten glass glass shaping body that is shaped seriatim.For making the shaping die that stays in the foundry goods position on aforementioned location, make its rising near the pipe lower end, the lower end of effusive molten glass flow is by the recess supporting that is arranged on the aforementioned shaping die, the lower end of molten glass flow and and the pipe part of joining between produce necking part.After this, shaping die is descended rapidly and from the molten glass flow (do not use cut off sword) of aforementioned necking section below it on the opportunity of regulation, and accept on the above-mentioned recess.Come isolating glass block is applied blast from shaping die recess ejection nitrogen, Yi Bian make its come-up, Yi Bian the glass shaping body that is shaped.Glass on the shaping die takes out from shaping die after curing.
In addition, the action of control shaping die makes and carries out with certain cycle from the separation of managing effusive melten glass.
Like this, identical during with the device that uses Fig. 1, the glass shaping body of making high-quality, high weight precision, forming by various opticglass.
(embodiment 11)
Then, use except the less this point of external diameter in managing with in embodiment 8～10, use respectively install same device, melten glass drips from the pipe spout, drip continuing surface and accept melten glass and drip with being arranged at the melten glass that rests on around the locational shaping die recess of foundry goods, in the mode of on aforementioned continuing surface, sliding or roll melten glass is dripped to recess and to guide, with embodiment 8～10 similarly, while apply blast and make its come-up be configured as glass shaping body by gas.
Like this, produce in batches weight precision height, promptly, with respect to the weight of target glass molding weight tolerance ± 1% with interior glass shaping body.On these moldinies, do not observe defectives such as devitrification, brush line.In addition, in the present embodiment, use and contain SiO 2And B 2O 3Glass, contain B 2O 3And La 2O 3Glass, contain SiO 2And TiO 2Various opticglass such as glass, phosphoric acid glass.
(embodiment 12)
Then, device shown in each embodiment of use embodiment 8～10, similarly to Example 3, under pipe, the mold of the box of an opening in upper surface and 4 sides disposed in the mode of bottom level and fixing, molten glass flow flow in the mold from pipe continuously with certain flow rate.The glass that flows into expands in the whole mold, and flows to the side surface direction of opening.Like this, having seized hot forming of glass by mold is the plate glass that has by the width of the lateral interval determination of mold.The plate glass that is shaped is pulled out from the lateral peristome along continuous straight runs of mold with certain speed, while pass through to anneal in the annealing furnace.
Keep certain owing to flow out the flow velocity of the effusive glass of device by melten glass, if the speed of pulling out of control plate glass makes the melten glass liquid level in the mold keep certain, then can be shaped has the plate glass of certain thickness.
On the plate glass molding that is shaped like this, do not observe defectives such as devitrification and brush line.
In addition, in the present embodiment, also use and contain SiO 2And B 2O 3Glass, contain B 2O 3And La 2O 3Glass, contain SiO 2And TiO 2Various opticglass such as glass, phosphoric acid glass.
(embodiment 13)
As preform, the various optical elements that comprise non-spherical lens are made in heating in nitrogen atmosphere, softening and use compression forming mould to carry out precise press molding with the glass shaping body made among the embodiment 8～11.In addition, the compression forming mould that is used for precise press molding uses known shaping die, and the press forming condition is also suitably adjusted in known scope.
Can make the optical element of defectives such as not having devitrification, high-quality, high form accuracy like this.
(embodiment 14)
Then, the glass shaping body of making is carried out barreling in embodiment 8～10, Powdered releasing agents such as boron nitride are coated on the whole surface equably, heating in atmosphere, softening and use the compression forming mould press forming to be lens shape.Then, in that grinding, grinding are carried out to the surface in press forming product annealing back, be finish-machined to spherical lens.
Like this, can make the optical element of defectives such as not having devitrification, high-quality, high form accuracy.
In addition, use known barreling, compression forming mould to get final product, the press forming condition is also suitably adjusted in known scope and is got final product.
(embodiment 15)
Then, the glass shaping body that will make in embodiment 12 cuts into the size of regulation, makes the sheet glass of a plurality of cubics.This sheet glass is carried out barreling, Powdered releasing agents such as boron nitride are coated on the whole surface equably, heating in atmosphere, softening and use the compression forming mould press forming to be lens shape.Then, in that grinding, grinding are carried out to the surface in press forming product annealing back, be finish-machined to spherical lens.
Can make the optical element of defectives such as not having devitrification, high-quality, high form accuracy like this.
In addition, use known barreling, compression forming mould to get final product, the press forming condition is also suitably adjusted in known scope and is got final product.
(embodiment 16)
Then, the glass shaping body that will make in embodiment 12 cuts into the size of regulation, makes the sheet glass of a plurality of cubics.The surface of these sheet glass ground make preform, the various optical elements that comprise non-spherical lens are made in heating in nitrogen atmosphere, softening and use compression forming mould to carry out precise press molding.In addition, the compression forming mould that is used for precise press molding uses known shaping die, and the press forming condition is also suitably adjusted in known scope.
Like this, can make the optical element of defectives such as not having devitrification, high-quality, high form accuracy.
According to the present invention, can make the optical element of defectives such as not having devitrification, high-quality, high form accuracy.The optical element that obtains according to the present invention is suitable for the various elements such as prism as non-spherical lens, spherical lens, micro lens, prism, diffraction grating, band lens.

Claims (17)

1. the manufacture method of a glass shaping body makes melten glass flow out from the spout that is arranged at the pipe front end, and the molding that is shaped and is formed by opticglass is characterized in that,
By the front end in aforementioned tubes rise upper section around dispose coil, make high-frequency current flow through this coil, to the pipe bottom carry out induction heating,
By connecting at least pair of electrodes on the top of more leaning on than aforementioned tubes bottom upper end and electric current being flow through between this electrode, to the heating of switching on of aforementioned top, and/or, aforementioned top is heated by around the top of more leaning on than aforementioned tubes bottom, disposing heating element, and
Temperature to aforementioned top is monitored, and based on aforementioned monitored results the temperature of pipe is controlled.
2. the manufacture method of a glass shaping body makes melten glass flow out from the spout that is arranged at the pipe front end, and the molding that is shaped and is formed by opticglass is characterized in that,
By the front end in aforementioned tubes rise upper section around dispose coil, make high-frequency current flow through this coil, to the pipe bottom carry out induction heating,
On the aforementioned tubes bottom, connect at least one electrode,
Connect at least one electrode on the top of more leaning on than upper end, aforementioned tubes bottom,
By between former electrodes, flowing through electric current, the heating of switching on.
3. the manufacture method of glass shaping body as claimed in claim 2 is characterized in that, the part of the connection electrode of aforementioned tubes bottom be positioned at the aforementioned tubes bottom than central part by the upper part.
4. as the manufacture method of claim 2 or 3 described glass shaping bodies, it is characterized in that, the temperature on aforementioned top is monitored, the temperature of pipe is controlled based on aforementioned monitored results.
5. as the manufacture method of wantonly 1 the described glass shaping body in the claim 1～3, it is characterized in that, isolate the fused glass block of certainweight from effusive melten glass, and the molding of the aforementioned weight that in aforementioned glass block refrigerative process, is shaped.
6. as the manufacture method of wantonly 1 the described glass shaping body in the claim 1～3, it is characterized in that aforementioned molding is the press forming glass blank.
7. the manufacture method of glass shaping body as claimed in claim 6 is characterized in that, aforementioned press forming glass blank is the precise press molding preform.
8. the manufacture method of an optical element, the glass-made performing base is heated and carries out press forming, it is characterized in that, pass through mechanical workout, the press forming that utilizes the described method of claim 6 to make is removed with the surface of glass blank, make preform, aforementioned preform is heated and carry out press forming.
9. the manufacture method of an optical element heats and carries out precise press molding to the glass-made performing base,
It is characterized in that, utilize the described method of claim 7 to make aforementioned preform.
10. a melten glass flows out device, has: the melt glass container of storage melten glass; Be connected, have the pipe of the spout that flows out melten glass at front end with aforementioned container; And the heating unit of heating aforementioned tubes,
It is characterized in that aforementioned heating unit has: the pipe front end is played the induction heater that upper section carries out induction heating; And be used to contrast aforementioned lower end portion upper end more by the switch on energising heating arrangements of heating of the pipe on top, and
Based on the output signal of temperature sensor, the temperature of aforementioned tubes is controlled from the temperature on the aforementioned top of monitoring.
11. a melten glass flows out device, has: the melt glass container of storage melten glass; Be connected, have the pipe of the spout that flows out melten glass at front end with aforementioned container; And the heating unit of heating aforementioned tubes,
It is characterized in that aforementioned heating unit has: the pipe front end is played the induction heater that upper section carries out induction heating; And be configured in than the heating element on every side that more leans on last top on the aforementioned lower end portion, and
Based on the output signal of temperature sensor, the temperature of aforementioned tubes is controlled from the temperature on the aforementioned top of monitoring.
12. flow out device, it is characterized in that the aforementioned temperature transmitter is the thermopair that disposes contiguously with pipe as claim 10 or 11 described melten glass.
13. a melten glass flows out device, has: the melt glass container of storage melten glass; Be connected, have the pipe of the spout that flows out melten glass at front end with aforementioned container; And the heating unit of heating aforementioned tubes,
It is characterized in that aforementioned heating unit has: the pipe front end is played the induction heater that upper section carries out induction heating; Be used for to pipe switch on the heating the energising heating arrangements; With pipe coupling and a plurality of electrodes of being connected with aforementioned energising heating arrangements,
In aforementioned a plurality of electrode, at least one electrode is connected with the aforementioned tubes bottom.
14. melten glass as claimed in claim 13 flows out device, it is characterized in that, in aforementioned a plurality of electrodes, the electrode of below be connected to the pipe bottom than central part by the upper part.
15. flow out devices as claim 13 or 14 described melten glass, it is characterized in that, based on from the upper end, ratio bottom of monitoring aforementioned tubes more by the output signal of the temperature sensor of the temperature on last top, the temperature of aforementioned tubes is controlled.
16. melten glass as claimed in claim 14 flows out device, it is characterized in that, the aforementioned temperature transmitter is the thermopair that disposes contiguously with pipe.
17. the manufacturing installation of a glass shaping body from the glass shaping body that is shaped from the effusive melten glass of melten glass outflow device, is characterized in that,
Aforementioned melten glass outflow device is wantonly 1 the described device in the claim 10～13.
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