CN1958487B - Glass-made performing piece set, manufacture method for the same, and production method for optical element - Google Patents
Glass-made performing piece set, manufacture method for the same, and production method for optical element Download PDFInfo
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- CN1958487B CN1958487B CN2006101523721A CN200610152372A CN1958487B CN 1958487 B CN1958487 B CN 1958487B CN 2006101523721 A CN2006101523721 A CN 2006101523721A CN 200610152372 A CN200610152372 A CN 200610152372A CN 1958487 B CN1958487 B CN 1958487B
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B7/00—Distributors for the molten glass; Means for taking-off charges of molten glass; Producing the gob, e.g. controlling the gob shape, weight or delivery tact
- C03B7/10—Cutting-off or severing the glass flow with the aid of knives or scissors or non-contacting cutting means, e.g. a gas jet; Construction of the blades used
- C03B7/12—Cutting-off or severing a free-hanging glass stream, e.g. by the combination of gravity and surface tension forces
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/095—Glass compositions containing silica with 40% to 90% silica, by weight containing rare earths
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2215/00—Press-moulding glass
- C03B2215/40—Product characteristics
- C03B2215/46—Lenses, e.g. bi-convex
- C03B2215/49—Complex forms not covered by groups C03B2215/47 or C03B2215/48
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- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Glass Compositions (AREA)
Abstract
The invention provides a glass preform lot, among which the volume variation can be controlled. The glass preform lot comprises a plurality of spherical glass preforms for optical elements accurate extrusion forming, which have each an average mass of <=30 mg and the ratio of mass tolerance to the mass within +-0.3%. The invention also provides a method for manufacturing the glass preforms by forming fused rock glass for accurate extrusion forming. The method of producing the preform comprises drooping a molten glass flowing out of a nozzle from the lower end thereof, dropping the drooping molten glass at a constant frequency in such a state that at least the circumference of the above drooping glass is covered by a cover to obtain a molten glass drop, and forming the drop into the preform in a cooling process. The glass preform lot is composed of a plurality of the above preforms. In addition, a method for manufacturing the optical element by heating and accurately forming the preform taken out from the glass preform lot is provided.
Description
Technical field
The present invention relates to gather a plurality of glass-made performing pieces and the batch manufacturing method of the glass-made performing piece group that constitutes, described performing member and the manufacture method of optical element, described glass-made performing piece uses when making glass optical element by precision moulded formation.
Background technology
Make the technology of glass optical elements such as non-spherical lens as high precision, known have a precision moulded formation method.This method is also referred to as die casting optical forming method, it is specific as follows: thus use model forming module to carry out the global shape of die forming shaping optical element through heated glass system performing member with forming face that precision sizing forms, and forming face is critically copied on glass, form the optical function face.For example open in the flat 10-316448 communique and disclose aforesaid method the Japanese documentation spy.
In addition, the glass performing member that is used for making above-mentioned optical element for example can be opened 2002-121032 communique disclosed method by the Japanese documentation spy and produce, in the method, fused glass is flowed out, and be separated into the fused glass block of desired qualities, make this glass block in the refrigerative process, be configured as performing member then.
In recent years, the demand for the bantam of the such built-in camera head of mobile telephone of image-tape photographic camera increases.The image pickup optical system that is assembled on this camera head is made of subminiature lens, in order critically to locate, fix each lens, the location reference plane is arranged preferably.For example, can use the planar portions on the periphery that is arranged on lens face to be used as being used for critically determining the location reference plane at lens interval to each other, and can be with the location reference plane of lens side as the optical axis alignment that makes each lens.Precision moulded formation not only can critically form the optical function face, and can critically form by duplicating position relation, the angle of each face that the section of mould molding surface that comprises the optical function face forms, if therefore also form the location reference plane, then can form optical function face and location reference plane simultaneously by the copy mold forming face.
If bring into play the speciality of precision moulded formation as described above fully, then can make subminiature optical element efficiently, but on the other hand,, following problems will occur if control the volume of performing member inexactly.
At first, when the volume of performing member during greater than formed spatial volume under state with the model forming module closure, this performing member can be between each mold component that constitutes model forming module, between for example mold and the mould or extrude between bed die and the mould and become the shaping burr, the sliding of this shaping burr meeting mold damage, stop thereby causing producing, perhaps make the model forming module breakage.
On the other hand, when the volume of performing member during less than formed spatial volume under state with the model forming module closure, glass is filled insufficiently in above-mentioned space, cause the surface accuracy of optical function face to descend thus, the part that perhaps should become the location reference plane of glass does not reach mold component, thereby can not form the location reference plane.
Therefore, be achieved in order to make the method that forms optical function face and location reference plane simultaneously, volume accuracy that is the high performing member of quality precision are used in expectation.
Method as the high manufacturing glass-made performing piece of productivity, above-mentioned method (the Japanese documentation spy opens the 2002-121032 communique) is arranged, this method makes fused glass flow out, be separated into the fused glass block of desired qualities, makes this glass block be configured as performing member then in the refrigerative process.If use this method to produce performing member, can begin just to produce above-mentioned optical element in batches from glass melting with high productivity.But, as mentioned above, need the volume of accurate control performing member, yet in the method for existing production glass-made performing piece, there is a little difference in the volume of performing member, therefore, for using above-mentioned die forming method, the volume control of performing member may not be abundant.
Summary of the invention
The present invention makes in order to address the above problem, its purpose is, glass-made performing piece group a kind of precision moulded formation that is suitable for compact optical element, that constitute by the performing member of gathering a plurality of lighter weight is provided, wherein, the volume difference between each performing member is very strictly controlled.Another object of the present invention provides a kind of method of producing the glass-made performing piece group that the volume difference between each performing member very strictly controlled from melten glass.In addition, a further object of the present invention provides the production method of the glass shaping body group that the volume difference between a kind of glass shaping body very strictly controlled, make the method for performing member from the glass shaping body of described glass shaping body group, and each performing member of described performing member group carried out the optical element manufacture method that precision moulded formation is made optical element, described glass shaping body group has been gathered a plurality of glass shaping bodies made from melten glass as the performing member mother metal.
The present invention who is used to address the above problem is as follows.
[1] a kind of glass-made performing piece group, be made of a plurality of glass-made performing pieces of confession in the precision moulded formation of optical element, wherein, this glass-made performing piece is spherical, its average quality is below the 30mg, quality tolerance with respect to the ratio of described quality in ± 0.3%.
[2] as [1] described glass-made performing piece group, wherein, described glass-made performing piece is used for the optical element that precision moulded formation has following surface, and this surface is made of the face and the free surface that form by the forming face of duplicating model forming module when the precision moulded formation.
[3] a kind of manufacture method of glass-made performing piece, the melten glass that is used to be shaped is made the glass-made performing piece that precision moulded formation is used, it is characterized in that, make from the effusive melten glass of nozzle and hang down in the nozzle lower end, and the melten glass that hangs down is fallen with the fixed cycle, thereby obtaining melten glass drips, described melten glass drops in the refrigerative process and is configured as performing member, and under the state on every side that is covered with the melten glass that hangs down in the nozzle lower end at least with lid described melten glass is fallen.
[4], wherein, make the face that receives the melten glass that falls and the fixed distance of nozzle lower end, and described melten glass is fallen with the fixed cycle as the manufacture method of [3] described glass-made performing piece.
[5] as the manufacture method of [3] or [4] described glass-made performing piece, wherein, constitute described lid with isolator, and high-frequency current is flow through be configured in lid around radio-frequency coil, thereby nozzle is carried out high-frequency induction heating.
[6] as the manufacture method of [3] or [4] described glass-made performing piece, wherein, be shaped by the performing member that constitutes with lower-glass, this glass comprises mass percent and surpasses 20% SiO
2
[7] as the manufacture method of [3] or [4] described glass-made performing piece, wherein, repeat the operation of molding glass system performing member, thereby produce the glass-made performing piece group that constitutes by a plurality of glass-made performing pieces.
[8] a kind of manufacture method of glass shaping body, the melten glass that is used to be shaped is made glass shaping body, it is characterized in that, make from the effusive melten glass of nozzle and hang down in the nozzle lower end, and the melten glass that hangs down is fallen with the fixed cycle, drip thereby obtain melten glass, described melten glass drops in the refrigerative process and is configured as glass shaping body, and under the state on every side that is covered with the melten glass that hangs down in the nozzle lower end at least with lid described melten glass is fallen.
[9] as the manufacture method of [8] described glass shaping body, wherein, repeat the operation of molding glass molding, thereby produce the glass shaping body group that constitutes by a plurality of glass shaping bodies.
[10] a kind of manufacture method of glass-made performing piece, it is characterized in that, comprise following process: use the described method of claim 8 to make glass shaping body, and the surface of described glass shaping body is ground, thereby obtain to supply in the glass-made performing piece of precision moulded formation.
[11], wherein, repeat operation that the surface of glass shaping body is ground, thereby produce the glass-made performing piece group that constitutes by a plurality of glass-made performing pieces as the manufacture method of [10] described glass-made performing piece.
[12] a kind of production method of optical element, Accessory Right require to take out performing member in the 1 or 2 described glass-made performing piece groups, and heat, precision moulded formation.
[13] as the production method of [12] described optical element, it is characterized in that, carry out following precision moulded formation: use model forming module in each forming face of duplicating mold, bed die, sleeve die on glass with mold, bed die, sleeve die (sleeve mold), and make by duplicate face that the mold forming face forms with by duplicating the rib that face became that the sleeve die forming face forms and/or by duplicating face that the bed die forming face forms and being free surface by duplicating the rib that face became that the sleeve die forming face forms.
[14] a kind of production method of optical element is taken out performing member from the performing member group of producing by [7] described manufacture method, and heat, precision moulded formation.
[15] as the production method of [14] described optical element, it is characterized in that, carry out following precision moulded formation: use model forming module in each forming face of duplicating mold, bed die, sleeve die on glass with mold, bed die, sleeve die, and make by duplicate face that the mold forming face forms with by duplicating the rib that face became that the sleeve die forming face forms and/or by duplicating face that the bed die forming face forms and being free surface by duplicating the rib that face became that the sleeve die forming face forms.
[16] a kind of production method of optical element is taken out performing member from the performing member group of producing by [11] described manufacture method, and heat, precision moulded formation.
[17] as the production method of [16] described optical element, it is characterized in that, carry out following precision moulded formation: use model forming module in each forming face of duplicating mold, bed die, sleeve die on glass with mold, bed die, sleeve die, and make by duplicate face that the mold forming face forms with by duplicating the rib that face became that the sleeve die forming face forms and/or by duplicating face that the bed die forming face forms and being free surface by duplicating the rib that face became that the sleeve die forming face forms.
The invention effect
According to the present invention, can provide the light weight and the little glass-made performing piece group of mass discrepancy that are suitable for making compact optical element by precision moulded formation.In addition, because mass discrepancy is little, volume in the model forming module when so the glass volume that can determine according to average quality and the specific gravity of glass by the performing member that constitutes group decides mold closing, thereby can be in described volume filling glass fully, and can prevent unnecessary glass from entering in the gap between the member that constitutes model forming module and become the shaping burr.
According to the present invention, can produce the light weight and the little glass-made performing piece group of mass discrepancy that are suitable for making compact optical element in batches by precision moulded formation.Particularly, when the nozzle lower end falls, can between nozzle and the glass that falls, produce the glass of the intermediate elongated part of wire, for example comprise mass percent even if use above 20% SiO at melten glass
2Glass, also can the little performing member of workmanship difference.
According to the present invention, can be provided for producing in batches the method for the little glass shaping body of mass discrepancy, this glass shaping body is processed to the glass-made performing piece that precision moulded formation is used by grinding.And,, can produce the little glass-made performing piece of mass discrepancy in batches by grinding described glass shaping body.
According to the present invention, can use the little performing member of above-mentioned mass discrepancy to make optical element expeditiously, particularly small-sized or small-sized and have an optical element of the location reference plane that constitutes by the mould duplicate surface.
Description of drawings
Fig. 1 is the explanatory view that drips the device of producing the glass performing member from melten glass;
Fig. 2 is the vertical cross-section diagram that is used for dripping from melten glass the shaping dies of producing the glass performing member;
Fig. 3 is the sectional view as the lens of an embodiment of optical element of the present invention.
Embodiment
As mentioned above, the compact optical element that is built-in with like that on the bantam of camera head of the mobile telephone that is assembled into the image-tape photographic camera preferably has by precision moulded formation optical function face and the location reference plane that forms together.As mentioned above, the volume of feed glass system performing member accurately when this optical element of precision moulded formation.
For the performing member of above-mentioned optical element shaping usefulness, quality is to be fit to below the 30mg.And, require to be used for by the performing member that precision moulded formation forms the optical function face of optical element and location reference plane together have ± 0.3% with interior quality tolerance.
Melten glass is flowed out and be separated into the method that the melten glass of aimed quality drips to obtain high productivity, therefore be suitable for making above-mentioned performing member.Specifically, make the melten glass that in nozzle, flows down drip and the method that the glass drop that obtains forms performing member is suitable for from the nozzle flow outlet.The quality of glass drop is by acting on the downward acceleration on glass that hangs down in the nozzle flow outlet, the external diameter of nozzle lower end, the decisions such as surface tension of melten glass.Therefore, if fix these conditions, the glass drop of the fixed mass that just can continue to drip.
But, want to reduce with respect to ratio as the quality tolerance of the performing member quality of target, be the difference that is difficult to suppress quality only by keeping the above-mentioned all conditions of fixed.When taking glass drop with high-speed camera from situation that the nozzle flow outlet is dripped, thin part in the middle of at first can and will producing between the effusive melten glass at the melten glass that hangs down from spout, then, the elongated gradually extension of part that this centre is thin, the bottom of glass descends gradually simultaneously.When the thin part in this centre was the constantly elongated extension of wire, glass can disconnect in linear parts, was positioned at glass on the gap owing to surface tension turns back near the nozzle flow outlet, and became the glass that hangs down in the nozzle flow outlet.On the other hand, the glass that is arranged under the gap enters into isolating glass drop.
If examine more, can find all can change in the position of glass drop disconnection of following time each time.When the position that disconnects uprised, the amount that enters glass drop in the linear parts increased, and a little increases the quality of glass drop, and when the step-down of the position of disconnection, the amount that enters glass drop in the linear parts reduces a little minimizing of the quality of glass drop.This variation of quality meeting makes quality tolerance become big as can be known.
Through further finding that if linear parts is long, then the position of Duan Kaiing changes easily behind the detailed analysis, big thereby the variation of quality of glass drop becomes easily, when disconnecting under the short state of linear parts, the variation of quality of glass drop is little.In addition, the length of also finding linear parts under the condition of devitrification when preventing that glass from flowing out is determined by glass.
From above result as can be known, if the position that linear parts is disconnected is all fixed at every turn, then can reduce the mass discrepancy of gained glass drop.The change of above-mentioned position mainly causes owing to atmosphere upsets.Owing to flow out the pyritous melten glass from nozzle, thus nozzle and import to nozzle melten glass conduit around atmosphere be heated, thereby can around conduit, cause the convection current of atmosphere.In addition, because the shaping dies that mobile successively shaping melten glass drips below nozzle, so the action of building mortion also can make the atmosphere disorder.The position that above-mentioned situation all can make linear parts disconnect produces deviation.
Alleviate the method that atmosphere upsets by at length investigating above-mentioned phenomenon and adopting, realized the present invention first.
Glass-made performing piece group of the present invention is made of a plurality of glass-made performing pieces of confession in the precision moulded formation of optical element, wherein, this performing member is spherical, and its average quality is below the 30mg, quality tolerance with respect to the ratio of described quality in ± 0.3%.
As mentioned above, the performing member that requires to be used for the built-in compact optical element of mobile equipment etc. has lighter quality and high quality precision.Compact optical element is harmonized, when being assembled in the image pickup optical system, for the optical axis that makes a plurality of compact optical elements accurately consistent and correctly guarantee between each element distance and and imaging apparatus between distance, use is used to locate, fix the fixer of each element, and assembling operation can become easy like this.If each element is inserted in the said fixing device, also can correctly not harmonized and assemble even then do not position adjustment.For this reason, wish on optical element, to form at least two location reference planes simultaneously with the optical function face by precision moulded formation.In such precision moulded formation, glass need be filled into neither too much nor too littlely in the space that is called die cavity that surrounds by model forming module.Even the volume of performing member has surplus slightly, glass also can enter into the clearance portion between the mold component that constitutes model forming module and become the shaping burr when die forming, thereby might cause the precision moulded formation operation to stop, the burr that perhaps is shaped damage molding or section of mould molding surface.Otherwise even the volume of performing member has deficiency slightly, the filling of glass in die cavity will be insufficient, thereby can not fully duplicate optical function face or location benchmark, can't realize the purpose of expecting.Optical element as target is more little, and described problem is just easy more to become obvious.
Therefore, the present invention has solved the problems referred to above by said structure.
Here, so-called performing member group is meant the shape and all set of consistent a plurality of performing members of quality that is made of glass of the same race.For example, when producing the optical element of regulation in batches, prepare the performing member group that the performing member by necessary amount constitutes, from described group, take out performing member, and use the model forming module of same shape to carry out precision moulded formation, can produce the optical element of same shape thus in batches.At this moment, both can use many group model forming modules, and also can use one group of model forming module and one by one performing member be carried out precision moulded formation.The performing member group also can be considered to constitute with a plurality of performing member groups.For example,, can consider to constitute, also can consider to constitute with 100 groups that constitute by 10 performing members with 10 groups that constitute by 100 performing members for the group that constitutes by 1000 performing members.The number of the performing member of formation group is preferably more than 1000 in optimal way of the present invention, is more preferably more than 2000, more preferably more than 5000.The upper limit of number can decide by the required number of optical element.
The quality tolerance that can verify the performing member that in certain performing member group, constitutes the performing member group by the performing member group that constitutes by 500 performing members with respect to the ratio of average quality whether in ± 0.3%.Under the situation that the performing member group is made of 500 performing members, quality tolerance, is more preferably at preferably in ± 0.26% with respect to the ratio of described average quality ± 0.25% in.In addition, even constituting the number of the performing member of performing member group is more than 500, quality tolerance with respect to the ratio of average quality also preferably in ± 0.3%, as mentioned above, even be preferably more than 1000, be more preferably more than 2000, more preferably more than 5000, quality tolerance with respect to the ratio of average quality also preferably in ± 0.3%.
Optimal way of the present invention is the glass-made performing piece group that is made of following performing member, this performing member is used for the optical element that precision moulded formation has following surface, and this surface is made of the face and the free surface that form by the forming face of duplicating model forming module when the precision moulded formation.
The optical element of making by performing member of the present invention also has the location reference plane except the optical function face.For example, the location reference plane of lens is the reference planes and the accurately consistent each other reference plane of optical axis that is used to make lens that are used to determine lens interval to each other.By these reference planes are connected on the fixer, each lens of can correctly harmonizing.When being example, forming flange shape (Ngok shape) par on every side that surrounds each lens face, and make two flange shape pars on lens two sides parallel to each other with lens.A described flange shape par is connected on the fixer as the location reference plane.On another flange shape par, apply the pressure that is used to keep above-mentioned butt state, thereby lens are fixed on the fixer.In such lens, wish that the distance (being called lateral margin (コ バ) thickness) between two flange shape pars lacks (making the lateral margin thin thickness) as much as possible in following ranges, described scope is meant that when being shaped lens can be not damaged and when to the fixer scope that lens also can breakage fixedly the time.In such lens, the side between two flange shape pars that is the part that is called as lateral margin as the second location reference plane.The second location reference plane is to be used to align the reference plane of lens axis.Therefore, with lateral margin as duplicating the face of die forming section of mould molding surface when the precision moulded formation.The model forming module member that duplicates to lateral margin is the member that is called as sleeve die or mould.The sleeve die of using during the shaping compact optical element has the elongated through hole of inserting inner mould up and down.The part of this through-hole inner surface becomes the forming face that is copied on the lateral margin.On section of mould molding surface up and down, be provided for improving the mold release film of the release property of glass, but, therefore on the part of duplicating, do not form mold release film to lateral margin owing to be difficult on the through-hole inner surface of sleeve die, be provided with the uniform mold release film of thickness.Thereby welding is on the sleeve die through-hole inner surface when the die forming in order not make glass, and the area that can make lateral margin is as much as possible little in glass can not damaged scope, and the contact area of glass and sleeve die is dropped on the required inferior limit.
For the above reasons, make the lateral margin thinner thickness.But, when the lens of precision moulded formation lateral margin thin thickness, begin filling glass from the part that becomes lens face, and extend to the sleeve die direction gradually.At this moment, because it is little to duplicate the mold forming face and the spatial volume between the bed die forming face of two the flange shape pars that are shaped, therefore, even if constitute a little surplus of amount of the glass of performing member, even glass also can be extruded from described space, produces the shaping burr, if a little deficiency of the amount of described glass, sleeve die can not be arrived even if carry out moulded glass, thereby lateral margin can not be formed as the location reference plane.
In other words, at the performing member of above-mentioned optical element that is used for being shaped, under the quality below the 30mg, superfluous or insufficient allowance is ± 0.3% with interior scope.
Therefore, in the present invention, the average quality that makes the performing member of formation group is below the 30mg, is preferably below the 28mg, is more preferably 1～26mg, makes quality tolerance in ± 0.3%, preferably in ± 0.28%, be more preferably at ± 0.26% in.
The present invention is suitable for the lower and SiO by specific refractory power
2Mass percent surpass performing member group or glass shaping body group and their manufacture method that 20% glass constitutes.Even if, its quality is made as below the 30mg for making such glass effective for optical element also especially little in compact optical element.Above-mentioned glass preferred index (nd) is 1.65 glass, and further preferred index (nd) is the glass below 1.60.
Here, average quality is meant the addition mean value (Mav) that calculates according to the quality of each performing member.In addition, quality tolerance is the quality (being called Mmin) according to the performing member of the quality (being called Mmax) of the performing member of the quality maximum in the performing member of formation group and quality minimum, by ± (Mmax-Mmin)/value that the such formula of 2Mav calculates.Under the many situations of the number of the performing member of formation group, also can from described group, extract the performing member of specified quantity at random out, and use the performing member of extracting out to obtain Mav, Mmax, Mmin.
Below, the manufacture method of glass-made performing piece is described.The manufacture method of the glass-made performing piece of the present invention melten glass that is used to be shaped is made the glass-made performing piece that precision moulded formation is used, it is characterized in that, make from the effusive melten glass of nozzle and hang down in the nozzle lower end, and the melten glass that hangs down is fallen with the fixed cycle, thereby obtaining melten glass drips
Described melten glass drops in the refrigerative process and is configured as performing member, and
Under the state on every side that is covered with the melten glass that hangs down in the nozzle lower end at least with lid, described melten glass is fallen.
At first, will heat frit, fusion, the melten glass clarifying, homogenize and obtain import in the nozzle of conduit lower end by conduit.Melten glass flows out from the outlet of the glass flows of nozzle lower end, the temperature of control conduit and nozzle so that the glass flows output of time per unit fix.
Exporting effusive melten glass from glass flows hangs down in the nozzle lower end owing to surface tension.When acting on the downward power on glass that hangs down when making melten glass rest on the power of nozzle lower end, melten glass falls from the nozzle lower end.Here, because the glass flows output of time per unit is fixed, so falling with the fixed cycle of melten glass carried out.The quality of the melten glass that falls is the value that multiply by the described cycle with the glass flows output of the time per unit of quality representation.
That supposes that falling of alleged melten glass comprise also that melten glass drips here, drips and described linear parts disconnects after the lower end of melten glass arrives the face of accepting of accepting melten glass situation.
And, under the state on every side that is covered with the melten glass that hangs down in the nozzle lower end with lid, described melten glass is fallen.Path when making lid not block described falling is not to hinder falling of melten glass.And, for the upstream that the convection current by above-mentioned that weakens the nozzle lower end causes, the top of closure cap.By such structure, can make the position stability of melten glass disconnection, thereby can reduce the mass discrepancy of glass drop.
Suppose so-called glass drop except the fused glass block that obtains by dripping, comprise that also the lower end of melten glass arrives behind the face of accepting accept melten glass because the fused glass block that the disconnection of described linear parts obtains.
But the principal element of the length of decision linear parts is the SiO in the glass
2Content, work as SiO
2Amount during greater than certain level linear parts elongated, a hour linear parts shortens.Therefore, SiO
2The big glass of content, just can obtain obvious effects more.
In the long glass of linear parts, the impact when accepting face by the lower end arrival of melten glass, linear parts disconnects.Therefore, preferably make the distance of the face of accepting the melten glass fall and lower end for fixing, so that described melten glass was fallen with the fixed cycle.By such structure, the moment that can make the length of the linear parts when at every turn falling and the isolating impact of linear parts is taken place is stable, thereby can reduce the mass discrepancy of glass drop.
The height of the lower end of lid is preferably from accepting face 0.2～0.8 times to the distance of nozzle lower end, more preferably 0.3～0.7 of above-mentioned distance times.
If the bore of lid is excessive, then operability can descend, thereby is difficult to stablize the atmosphere in the lid, if too small, then effusive melten glass perhaps contacts with nozzle or conduit etc. sometimes attached on the lid.In addition, described laterly the melten glass that hangs down in the nozzle lower end is applied blast make under the situation of its method that falls promoting adopting,, then be difficult to around nozzle, form stable air-flow if bore is too small.Therefore, can be under the situation of considering the premises, the bore of suitably setting lid is to reduce quality tolerance.
Described lid has the slack-off effect of speed of cooling of the melten glass that hangs down in the nozzle lower end that makes.That is the melten glass that hangs down is by lid and insulation, thereby the speed that glass viscosity rises is slack-off, and then the viscosity of linear parts can be remained on and be suitable in the isolating scope, and the viscosity of glass drop is remained in the scope that is suitable for the glass balling.
The preferred isolator that uses constitutes lid, and configuring high-frequency coil and make high-frequency current flow through this radio-frequency coil around lid carries out high-frequency induction heating to nozzle thus simultaneously.By such structure, can be under the situation of lid not being carried out induction heating carry out induction heating, thereby the temperature that can control nozzle and does not make the glass devitrification keeping the discharge of expectation to the nozzle that uses platinum or platinum alloy manufacturing.
Application of the present invention is not subjected to the qualification of glass types, but because there is especially effectively glass, so following this glass is described.Below, only otherwise specify that the content of glass ingredient is just represented with quality %.
As mentioned above, the length of the linear parts of melten glass is by the SiO in the glass
2Amount decision.Work as SiO
2It is elongated that amount surpasses 20% o'clock linear parts, thereby the separation point position can be easy to generate difference owing to the upset of atmosphere.Therefore, the manufacture method of glass-made performing piece of the present invention is for SiO
2Amount is effective especially above 20% glass.SiO
2Amount be preferably more than 21%, be more preferably more than 23%, more preferably more than 30%, more preferably more than 35%, be preferably more than 40% the most again.If SiO
2Amount is superfluous, and then glass will successfully separate.Therefore, state that can separation of glasses can be thought of as SiO
2The upper limit of amount preferably makes SiO
2Amount is more preferably below 60% in above-mentioned scope and less than 65%, more preferably below 55%.
As the glass among the present invention, can exemplify out and comprise 21～65% SiO
2, 0～40% B
2O
3, 0～12% Li
2O, 0～10% Na
2O, 0～10% K
2O, 0～10% MgO, 0～25% CaO, 0～25% SrO, 0～40% BaO, 0～30% ZnO, 0～20% La
2O
3, 0～10% Gd
2O
3, 0～10% Y
2O
3, 0～15% ZrO
2, 0～30% TiO
2, 0～10% Ta
2O
5, 0～8% Nb
2O
5Glass.
In addition, if SiO
2Amount be equal extent, then for the little glass of proportion, the more difficult generation of the separation of linear parts, therefore, effective especially for the shaping of the performing member that constitutes less than 3.3 glass by proportion.And then be that the shaping of the glass below 3.2 is more effective for proportion.
In the manufacture method of glass-made performing piece of the present invention, by the glass-made performing piece group that repeats the operation of molding glass system performing member, can produce to constitute by a plurality of glass-made performing pieces.In this glass-made performing piece group, to the greatest extent the average quality of conduit performing member is very light, and below 30mg, but quality tolerance still is that difference is very little in ± 0.3% with respect to the ratio of quality.
In addition, the shape that preferably will constitute each performing member of above-mentioned group is made glomeration.When the precision moulded formation compact optical element, under the situation of using the globular performing member,, then can stably settle performing member at the center of forming face if the bed die forming face is a concave shape.For SiO
2The glass of amount in above-mentioned scope, also because the volume of glass drop is little, it is higher than the viscosity that is suitable for balling that its viscosity can become, but according to the present invention, because the melten glass of insulation is fallen, the glass drop of the viscosity that is suitable for balling so can be shaped, thus the globular performing member can stably be made.
So far, manufacture method to performing member group of the present invention and performing member is illustrated, below to by the glass shaping body group that constitutes of a plurality of glass shaping bodies and the manufacture method of glass shaping body describe, described glass shaping body is used to be processed into in the glass-made performing piece of precision moulded formation.
The glass shaping body group is made of a plurality of glass shaping bodies, described glass shaping body is used to be processed into confession in the glass-made performing piece of precision moulded formation, in this glass shaping body group, described glass shaping body is spherical, its average quality is below the 30mg, quality tolerance with respect to the ratio of described quality in ± 0.3%.
The manufacture method of the glass shaping body of the present invention melten glass that is used to be shaped is made glass shaping body, it is characterized in that,
Make from the effusive melten glass of nozzle and hang down, and the melten glass that hangs down is fallen with the fixed cycle, drip thereby obtain melten glass in the nozzle lower end,
Described melten glass drops in the refrigerative process and is configured as glass shaping body, and
Under the state on every side that is covered with the melten glass that hangs down in the nozzle lower end at least with lid, described melten glass is fallen.
In the manufacture method of above-mentioned glass shaping body, by the glass shaping body group that repeats the operation of molding glass molding, can produce to constitute by a plurality of glass shaping bodies.
The glass shaping body group is the set of a plurality of glass shaping bodies.The notion of the group in notion and the above-mentioned performing member group of group is identical.Can obtain performing member by the surface of glass shaping body being carried out mechanical workout (for example grinding).In order to obtain the performing member group from the glass shaping body group, if the amount of removing when making the mechanical workout of each glass shaping body all equate, just can access the group that constitutes by the equal performing member of quality, be performing member group of the present invention.Specifically, make glass shaping body, and the surface of described glass shaping body is ground, supply in the glass-made performing piece of precision moulded formation thereby make by aforesaid method.
The operation on the surface by repeating to grind above-mentioned glass shaping body can be produced the glass-made performing piece group that is made of a plurality of glass-made performing pieces.
When the shaping glass shaping body, aforesaid phenomenon also takes place in the process that melten glass falls, therefore, the variation of quality elongated for linear parts, glass shaping body becomes big glass easily, that is for the SiO in the glass
2Amount is effective especially above 20% glass.Glass shaping body and performing member are made the performing member its manufacture method, glass ingredient and more identical with above-mentioned explanation than weight average except whether processing.
In the manufacture method of the manufacture method of above-mentioned performing member, glass, the outflow of melten glass, be shaped and adopt known method.In will being maintained the temperature province of devitrification not, simultaneously, it is flowed out from heat-resisting nozzle (for example nozzle of platinum or platinum alloy system) with the fixed flow by clarification, the melten glass that stirs.Move into shaping dies to the nozzle below with recess, accept the glass drop that drips from nozzle with the fixed cycle with the periphery of recess, and by making its rolling or slip import recess, gas by spraying up then from the gas vent that is arranged at recess bottom, glass drop is moved up and down in recess and be configured as spherically simultaneously, obtain performing member thus.In the batch process of performing member, prepare a plurality of shaping dies, successively it is moved into the nozzle below to accept glass drop, the shaping dies of having accepted glass drop is taken out of from the nozzle below, move into empty shaping dies to the nozzle below again.Move the shaping dies that is loaded with glass drop on one side, be performing member at the recess internal shaping on one side, after performing member is cooled to indeformable temperature province, take out performing member from shaping dies, then shaping dies is moved into the nozzle below once more as the shaping dies of sky.By being carried out such operation successively, each of a plurality of shaping dies produces performing member in batches.Here the performing member bulk article that obtains is equivalent to the performing member group.The manufacture method of glass shaping body too.
If scar, defective such as dirty are arranged on the performing member surface, then can cause the defective of optical element, therefore, wish to produce slick surface by glass shaping body is ground, make and do not leave the scar damage on the performing member surface.In addition, residual in order not make abrasive after grinding end, clean performing member so that its cleaning surfaces.
Below, the batch manufacturing method of optical element is described.The manufacture method of optical element of the present invention be take out the performing member bulk article of producing in batches from described each glass-made performing piece group or by described various manufacture method performing member and to this performing member heat, the batch manufacturing method of the optical element of precision moulded formation.
Because the performing member of described taking-up all is the globular performing members that have with the accurately consistent quality of aimed quality, so can stably make the compact optical element with following surface, this surface is made of the face and the free surface that form by the forming face of duplicating model forming module when the precision moulded formation.
Precision moulded formation is to use the model forming module that comprises mold, bed die, sleeve die, after heating performing member is carried out die forming, and the shape of the forming face of model forming module is correctly duplicated the method on glass that is formed into.The formation method of the processing of the moulding stock of model forming module and the material of moulding stock, the mold release film that forms the forming face of mold and bed die, mold release film and the atmosphere type etc. of carrying out precision moulded formation can be used technique known.
For example, produce identical shaped optical element in batches by carrying out following precision moulded formation, that is: use model forming module with mold, bed die, sleeve die, each forming face with mold, bed die, sleeve die copy on glass in, make by duplicate face that the mold forming face forms with by duplicating the rib that face became that the sleeve die forming face forms and/or by duplicating face that the bed die forming face forms and being free surface by duplicating the rib that face became that the sleeve die forming face forms.
It is an example of precision moulded formation method below: the center that spherical performing member is configured in the bed die forming face of the concave in the through hole that inserts sleeve die, and mold is inserted in the through hole of sleeve die, so that its forming face is relative with the bed die forming face.Under this state, heat performing member and model forming module simultaneously, and rise to expression 10 in the temperature of the glass that constitutes performing member
6During the temperature of the viscosity of dPas, performing member is pressurizeed with mold and bed die.Pressurized performing member extends in the space (being called die cavity) that is surrounded by mold, bed die, sleeve die.As mentioned above, by moulded glass system performing member glass is filled in the enclosed space that forms under the state of model forming module mold closing.
Accurately form relative position, the face normal angulation of each forming face of mold under the mold closing state, bed die, sleeve die.If use such model forming module to carry out above-mentioned shaping, then can form optical function face and location reference plane with high-precision mutual alignment relation, angle.
When with lens be configured as example the time, with the central part of mold forming face as the optical function face that duplicates molded lens, be the face of lens face, with periphery as the ring plain that duplicates the flange shape par that is shaped.For the bed die forming face, too with central part as the face that duplicates the shaping lens face, with periphery as the plane on the endless belt that duplicates the flange shape par that is shaped.Before die forming finishes, correctly keep mould up and down so that described mould up and down relative toward each other, and make the central shaft unanimity of mould up and down.
By glass being filled in the enclosed space that forms under the state of model forming module mold closing, the internal surface of sleeve die through hole is copied on glass.Accurately form in advance the angle of the central shaft and the described through-hole inner surface of sleeve die through hole, and keep the central shaft of described through hole and the mould central shaft is accurately consistent up and down finishes up to die forming, can correctly form the relative position of lateral margin of lens of the internal surface that is replicated two lens faces of shaping, two flange shape pars and sleeve die and face angulation each other thus.And, can be used as the reference plane of locating lateral margin with lateral margin with one in two flange shape pars, with one in the flange shape par as the reference plane of distance between positioning lens correctly, and with lateral margin as the accurately consistent reference plane of optical axis that makes between lens.
In addition, for internal surface and the beading that prevents sleeve die, even in the not damaged scope of lens, do lateral margin thickness thinner, also can be with respect to quality as the lens of target, correctly determine the quality of each performing member, therefore, the lateral margin of the effect of the location reference plane that can be shaped by the internal surface that duplicates the sleeve die through hole, and also can not produce the shaping burr and cause the batch process of optical element to stop.
Preferably form the crossing rib of lateral margin and flange shape par with free surface.If form lateral margin and flange shape par, the danger of positioning function then can not appear hindering, if but rib is very sharp keen, and when embedding fixer, the situation of rib breakage or rib scraping fixer will occur, thereby become the reason that produces dust.If dust is attached on the sensitive surface of imaging apparatus, then can cause picture quality to decline to a great extent, therefore in order to prevent such problem, the preferred shaping has the precision moulded formation product of the rib that is made of free surface.
In optical element, preferably form at least more than the two sides, specifically two sides or three s' location reference plane by precision moulded formation.Preferably the location reference plane with described two sides or three forms not parallel to each other.If use this mutually uneven two reference planes to locate optical element, then can determine accurately the optical element in the optical system the location and towards.The optical element that has rotational symmetry as lens only has two reference planes just passable.Under the situation of the optical element that as prism, does not have rotational symmetry, form three the location reference planes, thereby determine accurately in the optical system the location and this locational towards.
Also can on the optical element of making like this, form optical multilayers such as antireflection film as required.
[embodiment]
Embodiment is described.
(first embodiment)
At first, in order to obtain the SiO shown in the table 1
2Mass percent surpass 20% opticglass, weighing, blending frit are also fully stirred it, then it is imported in melt container heat, fusion, clarification, stirring, obtained uniform melten glass thus.Use device shown in Figure 1, drip from the melten glass of melten glass and produced the glass performing member.
Open the conduit that is connected the melt container bottom, melten glass is flowed out from the nozzle that is installed in the conduit lower end with the fixed flow.Respectively nozzle, conduit and melt container are carried out temperature control,, do not make its devitrification so that glass reaches the viscosity that can obtain to expect discharge.
As shown in Figure 1, be provided with gas passage formation with lid 3, in the gas passage forms with the space between lid and conduit and the nozzle, be provided with the gas passage 4 that is used to make gas communication in the lower end of conduit 1 and the periphery of nozzle 2.And formation is provided with peristome 3-1 with the lid lower end in the gas passage, and makes nozzle tip outstanding from described peristome.Preferably nozzle, gas passage are formed with lid and gas passage and form with lid opening portion respectively around the central shaft of nozzle and balanced configuration.In addition, also wish to center on above-mentioned central shaft and evenly mobile with lid opening portion expellant gas from gas passage formation.
In the present embodiment, fall with the fixed cycle, by adjusting internal diameter, the interior external diameter of nozzle and the temperature of conduit and nozzle of conduit, the discharge of coming feed glass in order to make the melten glass that hangs down in the nozzle lower end.Export effusive melten glass from glass flows and hang down, spray from gas passage formation to the melten glass that hangs down and use lid opening portion, thereby apply downward blast with the downward gas of ejection continuously of fixed flow in the nozzle lower end.
And, as shown in Figure 1, form with lid 5 is installed around the lid 3 around nozzle 2, gas passage.Lid 5 covers (lateral full week of path) around 1/3～1/2 spatial of nozzle one side in whole paths that the melten glass that hangs down the nozzle lower end and melten glass fall, and the top of lid 5 also is closed in addition.But the lower opening of lid 5 is not to block the path that melten glass falls.Reduce the interference that causes by outside atmosphere by lid 5, for example reduce nozzle upstream on every side, thereby in lid 5, create the atmosphere of steady state.In lid 5, form with invariable stable the flowing downward of the gas of lid opening portion ejection from the gas passage.
Dispose radio-frequency induction coil 6 in the outside of lid 5, and make high-frequency current flow through radio-frequency induction coil 6, thereby nozzle is carried out high-frequency induction heating.Make lid 5 with the thermotolerance isolator, so that its not sensed heating.Silica glasss etc. are suitable for use as the material of lid 5.If make lid 5, then can also observe the inside of lid 5 from the outside with this transparent thermotolerance isolator.
Gravity on acting on the melten glass that hangs down is when making melten glass rest on the power of nozzle lower end, and melten glass falls.But, in the method, can only obtain by making melten glass rest on the glass drop of quality of the power decision of nozzle lower end, and the lighter glass drop that can not drip.
But, according to present embodiment, because the melten glass that hangs down is subjected to the downward power that the blast by gas brings, so can correspondingly obtain lighter glass drop.If wait the pilot-gas flow so that gas flow is constant fixing by mass flow controller, then can make the steady quality of glass drop.
The melten glass that falls is accepted by the shaping dies of waiting for below nozzle.In order to make the steady quality of glass drop, make the distance of shaping dies keep waiting under the constant situation in the face of accepting of it being accepted the melten glass lower end and nozzle lower end, the lower end of the melten glass that acceptance falls, and the impact that arrives when accepting face by melten glass makes glass separate in linear parts.Fig. 2 shows the vertical cross-section of shaping dies 7.Use the glass drop of shaping dies to accept the glass drop that face 7-1 acceptance is dripped.Because accepting face 7-1, glass drop tilts, so glass drop slips into or rolls into the recess 7-2 from accepting face 7-1 to the direction that is arranged on the recess 7-2 above the shaping dies equally.
As shown in Figure 2, the cross section of recess 7-2 has and is extended to trumpet-shaped shape from bottom to top, is provided with a gas vent that upwards sprays gas in the recess bottom.The glass drop that imports recess rolls towards recess bottom one edge recess inwall and descends on one side, but because the internal diameter of recess reduces along with moving down, so glass drop descends, the suffered blast that makes progress is just more and more stronger.Its as a result glass drop in recess, rise, still, in case rise, the blast that makes progress will die down, therefore an edge recess inwall rolls and descends on one side.So, be subjected to intensive blast upwards once more, the motion that an edge recess inwall rolling then descends on one side thereby glass drop repeats to rise at short notice in recess.Because glass drop is at random along the direction that the recess inwall rolls, so while in repeating the process of above-mentioned motion glass drop form spherical the cooling, thereby be configured as spherical performing member.Being cooled to the indeformable temperature of performing member constantly, take out the performing member in the recess, and with glass disruptive speed cool to room temperature not.
By using a plurality of shaping dies to repeat above-mentioned operation, the spherical performing member of quality such as can mass-produce.Like this, just obtained the performing member group that is made of following performing member, this performing member is made of opticglass, has desired qualities, and quality tolerance is little, and is spherical.
(second embodiment)
Then, use is produced globular performing member mother metal in batches with the identical method of aforesaid method.Table 1 shows the number, average quality, quality tolerance of the glass of use, the mother metal that obtains ratio (quality tolerance/average quality) and the diameter with respect to average quality.The group that is made of these performing member mother metals is annealed,, then it is ground, thereby obtain having and the quality tolerance of the performing member mother metal shown in the table 1 performing member group with respect to the identical value of ratio of average quality to reduce strain.
(the 3rd embodiment)
Each performing member group that use obtains in first, second embodiment and the small aspherical lens that obtained having the cross-sectional shape that schematically illustrates at Fig. 3 by precision moulded formation.In any one lens, all find breakage, and have enough optical properties as lens.In addition, lateral margin 8, the flange shape par 9 of each lens are duplicated the die forming section of mould molding surface and are formed, and the rib that intersect lateral margin and flange shape par is round slowly free surface.And, confirmed not produce the shaping burr.
These non-spherical lenses can be as the lens of the image pickup optical system that constitutes camera head built-in in the portable phone.With the lens that obtain like this and except shape, make by identical method, have entirety of lens package as the lateral margin of location reference plane and flange shape par in lens fixture, and under the state that makes location reference plane and fixer butt, fix, each lens correctly can be arranged in the fixer thus.
[comparative example]
Then, the glass shown in the use table 1 also utilizes identical with Fig. 1 but does not have the device of lid 5 to make the performing member shown in the table 1, and the result has obtained that quality tolerance is big, uneven group of quality.
Use described performing member group and come precision moulded formation small aspherical lens by method same as described above, the whole lateral margin that lens have appearred in the result becomes free surface and do not play the location reference plane, thereby perhaps produced the problem that the shaping burr causes model forming module can not slide or the like.
[table 1]
Table 1
Claims (16)
1. a glass-made performing piece group is made of a plurality of glass-made performing pieces of confession in the precision moulded formation of optical element, it is characterized in that,
Described glass-made performing piece is spherical, and its average quality is below the 30mg, quality tolerance with respect to the ratio of described quality in ± 0.3%,
Wherein, the SiO in the described glass
2Content surpasses 20% and be below 65%.
2. glass-made performing piece group as claimed in claim 1, it is characterized in that, described glass-made performing piece is used for the optical element that precision moulded formation has following surface, and this surface is made of the face and the free surface that form by the forming face of duplicating model forming module when the precision moulded formation.
3. the manufacture method of a glass-made performing piece, the melten glass that is used to be shaped is made the glass-made performing piece that precision moulded formation is used, it is characterized in that,
Make from the effusive melten glass of nozzle and hang down, and the melten glass that hangs down is fallen with the fixed cycle, drip thereby obtain melten glass in the nozzle lower end,
Described melten glass drops in the refrigerative process and is configured as performing member, and
Be covered with lid at least the melten glass that hangs down in the nozzle lower end around and under the state on the top of closure cap described melten glass is fallen,
Wherein, the SiO in the described glass
2Content surpasses 20% and be below 65%.
4. the manufacture method of glass-made performing piece as claimed in claim 3 is characterized in that, makes the face that receives the melten glass fall and the fixed distance of nozzle lower end, and described melten glass is fallen with the fixed cycle.
5. as the manufacture method of claim 3 or 4 described glass-made performing pieces, it is characterized in that, constitute described lid with isolator, and high-frequency current is flow through be configured in lid around radio-frequency coil, thereby nozzle is carried out high-frequency induction heating.
6. as the manufacture method of claim 3 or 4 described glass-made performing pieces, it is characterized in that, repeat the operation of molding glass system performing member, thereby produce the glass-made performing piece group that constitutes by a plurality of glass-made performing pieces.
7. the manufacture method of a glass shaping body, the melten glass that is used to be shaped is made glass shaping body, it is characterized in that,
Make from the effusive melten glass of nozzle and hang down, and the melten glass that hangs down is fallen with the fixed cycle, drip thereby obtain melten glass in the nozzle lower end,
Described melten glass drops in the refrigerative process and is configured as glass shaping body, and
Be covered with lid at least the melten glass that hangs down in the nozzle lower end around and under the state on the top of closure cap described melten glass is fallen,
Wherein, the SiO in the described glass
2Content surpasses 20% and be below 65%.
8. the manufacture method of glass shaping body as claimed in claim 7 is characterized in that, repeats the operation of molding glass molding, thereby produces the glass shaping body group that is made of a plurality of glass shaping bodies.
9. the manufacture method of a glass-made performing piece, it is characterized in that, comprise following process: use the described method of claim 7 to make glass shaping body, and the surface of described glass shaping body is ground, thereby obtain to supply in the glass-made performing piece of precision moulded formation.
10. the manufacture method of glass-made performing piece as claimed in claim 9 is characterized in that, repeats operation that the surface of glass shaping body is ground, thereby produces the glass-made performing piece group that is made of a plurality of glass-made performing pieces.
11. the production method of an optical element, Accessory Right require to take out performing member in the 1 or 2 described glass-made performing piece groups, and heat, precision moulded formation.
12. the production method of optical element as claimed in claim 11, it is characterized in that, carry out following precision moulded formation: use model forming module in each forming face of duplicating mold, bed die, sleeve die on glass, and make and be present in by duplicating face that the mold forming face forms and by duplicating the face between the face that the sleeve die forming face forms and/or being present in by duplicating face that the bed die forming face forms and being free surface by the face that duplicates between the face that the sleeve die forming face forms with mold, bed die, sleeve die.
13. the production method of an optical element is taken out performing member from the performing member group of producing by the described manufacture method of claim 6, and heat, precision moulded formation.
14. the production method of optical element as claimed in claim 13, it is characterized in that, carry out following precision moulded formation: use model forming module in each forming face of duplicating mold, bed die, sleeve die on glass, and make and be present in by duplicating face that the mold forming face forms and by duplicating the face between the face that the sleeve die forming face forms and/or being present in by duplicating face that the bed die forming face forms and being free surface by the face that duplicates between the face that the sleeve die forming face forms with mold, bed die, sleeve die.
15. the production method of an optical element is taken out performing member from the performing member group of producing by the described manufacture method of claim 10, and heat, precision moulded formation.
16. the production method of optical element as claimed in claim 15, it is characterized in that, carry out following precision moulded formation: use model forming module in each forming face of duplicating mold, bed die, sleeve die on glass, and make and be present in by duplicating face that the mold forming face forms and by duplicating the face between the face that the sleeve die forming face forms and/or being present in by duplicating face that the bed die forming face forms and being free surface by the face that duplicates between the face that the sleeve die forming face forms with mold, bed die, sleeve die.
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| CN1590329A (en) * | 2003-08-29 | 2005-03-09 | Hoya株式会社 | Precision press-molding glass preform, optical element and processes for the production thereof |
| CN1663923A (en) * | 2004-03-02 | 2005-09-07 | Hoya株式会社 | Optical glass, precision press-molding preform, process for production thereof, optical element and process for the production thereof |
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| CN1445188A (en) * | 2002-03-18 | 2003-10-01 | 保谷株式会社 | Optical glass precision pressure forming prefab for precision pressure forming and its making method |
| CN1590329A (en) * | 2003-08-29 | 2005-03-09 | Hoya株式会社 | Precision press-molding glass preform, optical element and processes for the production thereof |
| CN1663923A (en) * | 2004-03-02 | 2005-09-07 | Hoya株式会社 | Optical glass, precision press-molding preform, process for production thereof, optical element and process for the production thereof |
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