CN105793201A - Mold for glass optical element blank for polishing, method for producing glass optical element blank for polishing, and method for producing optical element - Google Patents

Mold for glass optical element blank for polishing, method for producing glass optical element blank for polishing, and method for producing optical element Download PDF

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Publication number
CN105793201A
CN105793201A CN201380081402.2A CN201380081402A CN105793201A CN 105793201 A CN105793201 A CN 105793201A CN 201380081402 A CN201380081402 A CN 201380081402A CN 105793201 A CN105793201 A CN 105793201A
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China
Prior art keywords
mould
glass
grinding
optical element
forming surface
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Granted
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CN201380081402.2A
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CN105793201B (en
Inventor
庄司昂浩
池西干男
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Hoya Corp
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Hoya Corp
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/06—Construction of plunger or mould
    • C03B11/08—Construction of plunger or mould for making solid articles, e.g. lenses
    • C03B11/084—Construction of plunger or mould for making solid articles, e.g. lenses material composition or material properties of press dies therefor
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/06—Construction of plunger or mould
    • C03B11/08—Construction of plunger or mould for making solid articles, e.g. lenses
    • C03B11/084—Construction of plunger or mould for making solid articles, e.g. lenses material composition or material properties of press dies therefor
    • C03B11/086—Construction of plunger or mould for making solid articles, e.g. lenses material composition or material properties of press dies therefor of coated dies
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/02—Press-mould materials
    • C03B2215/03—Press-mould materials defined by material properties or parameters, e.g. relative CTE of mould parts
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/02—Press-mould materials
    • C03B2215/05—Press-mould die materials
    • C03B2215/06—Metals or alloys
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/02—Press-mould materials
    • C03B2215/08—Coated press-mould dies
    • C03B2215/14—Die top coat materials, e.g. materials for the glass-contacting layers
    • C03B2215/20—Oxide ceramics
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/02—Press-mould materials
    • C03B2215/08—Coated press-mould dies
    • C03B2215/14—Die top coat materials, e.g. materials for the glass-contacting layers
    • C03B2215/24—Carbon, e.g. diamond, graphite, amorphous carbon
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/02—Press-mould materials
    • C03B2215/08—Coated press-mould dies
    • C03B2215/14—Die top coat materials, e.g. materials for the glass-contacting layers
    • C03B2215/26—Mixtures of materials covered by more than one of the groups C03B2215/16 - C03B2215/24, e.g. C-SiC, Cr-Cr2O3, SIALON
    • 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

Abstract

The objective of the present invention is to provide a mold for a glass optical element blank for polishing which has excellent moldability and is capable of improving yield. A mold according to the present invention is a mold which has at least an upper die and a lower die and is used to produce a glass optical element blank for polishing, wherein a molding surface of at least one of the upper die and the lower die has a surface roughness (Rz) of over 10 [mu]m.

Description

The manufacture method of grinding glass optical component blank mould, the manufacture method of grinding glass optical component blank and optical element
Technical field
The present invention relates to the manufacture method of grinding glass optical component blank mould, the manufacture method of grinding glass optical component blank and optical element.
Background technology
In recent years, along with the variation of optical element and extensively change, the needing of the optical element of glass is improved, and is also desirable that raising productivity ratio.
Forming method as glass optical component, for instance widely used reheating compression molding method etc..Reheat in compression molding method, utilize mould that (the optical glass raw material softened is only called " glass raw material " below sometimes.) carry out compression molding, make grinding glass optical component blank and (be sometimes only called " optical element blank " below.), it is carried out grinding/attrition process and obtains optical element (optical lens etc.).
In this reheating compression molding method, in order to make the processing capacity that grinding/grinding produces few, it is desirable to make the shape of optical element blank be similar to the shape of the optical element as target.Therefore, generally, determine that the forming surface of the mould of the shape of optical element blank is similar to the net shape (when such as final products are optical lens the curvature of lens) of optical element, and be comparatively smooth face (patent documentation 1).But, even if being this forming surface, processing capacity still cannot be substantially reduced.
Generally, in compression molding, utilize forming surface moderately to press the glass raw material softened, be shaped to the shape of regulation by the mobility of glass.But, if the temperature of glass raw material declines, then the viscosity of glass rises, and therefore loses flowability, it is difficult to chase after from forming surface.There is following problems in its result: cannot realize desired shape, and formed precision declines.
The decline of this formed precision especially can the temperature of mould when not being properly carried out compression molding produce when adjusting.That is, when the temperature of mould is lower than the glass raw material softened, by the contact surface of forming surface Yu glass raw material, the temperature dramatic decrease of glass raw material, the viscosity of glass rises.Its result is, cannot keep the viscosity of good glass when glass raw material is to mold pressing, and glass raw material cannot fully chase after from forming surface, producing and the form error of the shape as target.Between the optical element blank more than 2, this form error can cause form variations.
If this form error or form variations are a little, then can adjust by the grinding/grinding step when manufacturing optical element more sets stock removal.But, if increasing stock removal, then processing capacity increases, and therefore can cause long-timeization of process time and the consume of material.
If it addition, form error becomes excessive, then it is difficult to be adjusted by grinding, therefore removes from grinding process as the molded body of standard outer (extending bad).It results in the deterioration of yields.
In addition, when the glass raw material softened is fed into the forming surface of low temperature, produce the Temperature Distribution of glass raw material sometimes at the contact surface of the glass raw material contacted with forming surface and part in addition, the part particularly in viscosity degradation cracks (crack) sometimes because of pressing.This crackle (so-called be full of cracks is broken) can cause the deterioration of yields.
Prior art literature
Patent documentation
Patent documentation 1: JP 2001-019446 publication
Summary of the invention
The problem that invention to solve
The present invention completes in view of this practical situation, its object is to provide the grinding glass optical component blank mould that a kind of mouldability is excellent, can improve yields.
Means for solving the above
The present inventor is in order to solve above-mentioned problem, it is repeatedly performed deep experimental study, itself found that, by forming the concavo-convex of appropriateness in the forming surface of mould, the generation of crackle when being prevented from compression molding and can reduce the form variations of molded body and extend bad, thus completing the present invention.
The main points of the present invention are as follows.
[1] a kind of mould, this mould at least has upper die and lower die and for manufacturing grinding glass optical component blank, and wherein, the surface roughness (Rz) of the forming surface of at least one in above-mentioned upper die and lower die is more than 10 μm.
[2] mould as described in above-mentioned [1], wherein, the surface roughness (Rz) of above-mentioned forming surface is less than 50 μm.
[3] mould as described in above-mentioned [1] or [2], it for carrying out compression molding to the glass raw material softened in air atmosphere.
[4] a kind of manufacture method grinding use glass optical component blank, it includes following operation:
Prepare the operation of mould according to any one of above-mentioned [1]～[3]；With
Mold pressing procedure, wherein, after the glass raw material being made up of optical glass being reheated under air atmosphere, utilizes above-mentioned mould that the above-mentioned glass raw material softened is carried out compression molding.
[5] manufacture method of a kind of optical element, it includes following operation:
The grinding glass optical component blank that manufacture method manufacture described in above-mentioned [4] is obtained carries out the grinding process of grinding；With
The grinding step that grinding glass optical component blank through above-mentioned grinding process is ground.
Invention effect
Mould according to the present invention, it is possible to reduce the generation of molding bad (such as chap/break or extend bad etc.) or the form variations of molded body, it is possible to make the grinding glass sub-prime blank of better quality efficiently.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of an example of the mould illustrating an embodiment of the invention.
Fig. 2 is the sectional view amplified by the counterdie of the part as the mould shown in Fig. 1.
Fig. 3 is the sectional view of the counterdie amplification of the part using the mould as another embodiment of the present invention.
Fig. 4 is the schematic diagram of an example of the mold pressing procedure of the mould being shown with an embodiment of the invention.
Fig. 5 is the flow chart illustrating the operation being manufactured optical lens by grinding glass lens blank.
Fig. 6 is the mould illustrating and utilizing embodiment and comparative example and the scattergram of the form variations of grinding glass lens blank that makes.
Fig. 7 illustrates the scattergram that the grinding glass lens blank made utilizing the mould of embodiment and comparative example is annealed the form variations after processing.
Detailed description of the invention
The mould of the present invention at least has upper die and lower die, it is the mould for manufacturing grinding glass optical component blank (being sometimes only called " optical element blank " below), wherein, the surface roughness (Rz) of the forming surface of at least one in above-mentioned upper die and lower die is more than 10 μm.
Mould according to this present invention, when the glass raw material softened being carried out compression molding and manufacture grinding glass optical component blank, it is possible to reduce the form variations of the generation of molding bad (such as chap/break or extend bad etc.) or molded body, the grinding glass optical component blank of better quality can be made efficiently.Further, the grinding glass optical component blank made by the mould of the present invention is excellent in form accuracy, therefore can reduce processing capacity and process time in as the grinding/grinding step of subsequent handling, the manufacturing process of optical element can be improved in productivity ratio.
Below, mold pressing procedure (manufacture method of optical element blank) and the manufacture method of optical element to the mould of the present invention and manufacture method thereof and the mould employing the present invention are described in detail, but the present invention is not by any restriction of following embodiment, and the change that can apply to be suitable in the scope of the purpose of the present invention is implemented.It should be noted that about the place of repeat specification, omit the description aptly sometimes, but be not used to the purport of restriction invention.
< mould >
Hereinafter, with reference to Fig. 1～Fig. 3 while a mode of the present invention is illustrated.It should be noted that identical in figure or appropriate section are marked identical label its explanation no longer repeatedly.
Fig. 1 is the schematic diagram of an example of the mould illustrating an embodiment of the invention.The mould cited by Fig. 1 cylinder mould 30 by the upper mould 21 with forming surface and counterdie 11 and by mould on this 21 and ring-type that counterdie 11 regulation is substantially coaxial shape is constituted, and the surface roughness (Rz) of the respective forming surface 27,17 of upper mould 21 and counterdie 11 is more than 10 μm.
It should be noted that in the mould of present embodiment, cylinder mould 30 is arbitrary component parts.That is, about cylinder mould 30, when to utilize other method can be substantially coaxial shape by upper mould 21 and counterdie 11 regulation, it is not also necessary.
Additionally, in the mould of present embodiment, as long as the surface roughness (Rz) of at least any one forming surface of counterdie 11 and upper mould 21 is more than 10 μm, desirably, preferably at least the forming surface of counterdie 11 has the surface roughness (Rz) more than 10 μm, and more preferably the forming surface of both of counterdie 11 and upper mould 21 has the surface roughness (Rz) more than 10 μm.
Then, for the counterdie shown in Fig. 2, the mould of present embodiment is described in detail.Fig. 2 is the sectional view amplified by the counterdie 11 of the part as the mould shown in Fig. 1.It should be noted that about upper mould 12, omit the description, but can be identical with the situation of counterdie 11.
As in figure 2 it is shown, the counterdie 11 as of mould of present embodiment has forming surface 17, this forming surface 17 has concavo-convex (surface roughness (Rz) is more than 10 μm) of appropriateness.
Counterdie 11 according to this present embodiment, even if the glass raw material softened is fed into counterdie 11, it is also possible to by the concavo-convex contact area reduced with glass raw material of forming surface 17.Accordingly it is possible to prevent the temperature of glass raw material declines because of the contact portion with forming surface (viscosity rising), it is possible to reduce with forming surface not in contact with the temperature difference (differences in viscosity) of part.Its result is, till in time utilizing compression molding and make glass raw material deform, it is possible to the mobility of the glass raw material that abundant maintenance has softened and temperature homogeneity.
On the other hand, according to this counterdie 11, when glass raw material deforms because of compression molding, the glass raw material softened imitates the concavo-convex of forming surface 17 and deforms, and therefore can increase the contact area of glass raw material and forming surface 17.Its result is, it is possible to glass raw material being quenched rapidly, therefore shape is fixed well, and then the entirety of glass raw material is uniformly cooled, and is therefore also possible to prevent to produce strain (deformation) at inside glass.
The yields using the molded body (optical element blank) that the mould of this present embodiment obtains is high, and formed precision is excellent, and the form variations after annealing is few.Therefore, processing capacity when carrying out grinding/grinding can be reduced in subsequent handling.
The surface roughness (Rz) of the forming surface 17 of the counterdie of present embodiment is more than 10 μm, it is preferred to more than 12 μm, be more preferably more than 20 μm.In the mould of present embodiment, by making the surface roughness (Rz) of forming surface be above-mentioned scope, the heat insulation effect of the glass raw material that can have been softened before mold pressing, what can obtain glass raw material in mold pressing is quenched effect uniformly.
But, when the surface roughness (Rz) of forming surface is below 10 μm, the contact area of glass raw material and forming surface increases, therefore, it is difficult to the heat insulation effect of the glass raw material softened.Therefore, if utilizing this forming surface to carry out compression molding, then easily producing to chap/break or extend bad, yields declines, and after formed precision and annealing, after-contraction worsens, and the form variations of therefore obtained optical element blank has the tendency becoming big.
In the present embodiment, the upper limit of the surface roughness (Rz) of forming surface 17 is not particularly limited, but is preferably less than 50 μm, is more preferably less than 40 μm, more preferably less than 30 μm.The surface roughness of forming surface 17 is more big, then the surface roughness (Rz) of obtained molded body also has more big tendency.Therefore, the processing capacity in grinding/grinding step when making optical element has the tendency of increase.
It should be noted that in the present embodiment, surface roughness (Rz) refers to the maximum height (identical with the Rmax implication based on nineteen eighty-two JIS standard B0601) based on calendar year 2001 JIS standard B0601.This Rz is concavo-convex minimum place and the difference superlatively on surface.The mensuration of surface roughness (Rz) can be utilized the maneuver based on JIS standard, be measured by known determinator.
Additionally it may be desirable in the mould of present embodiment, on concavo-convex be preferably uniformly formed at forming surface 17 whole of forming surface 17.
In the present embodiment, in counterdie 11, the surface 13A making base material 13 is forming surface 17.The shape of this surface 13A is formed according to the mode of the shape following glass forming body (optical element blank), this glass forming body be shaped as being similar to the shape of the optical element as final products.Such as convex surface shape, concave curved planar can be enumerated, plane etc..Further, forming surface 17 has the concavo-convex of appropriateness, and therefore the surface roughness (Rz) of substrate surface 13A is more than 10 μm.
It addition, the material of base material 13 can according to suitable selections such as the hardness of the glass being shaped or glass transformation temperature Tg, it is possible to enumerate such as rustless steel, cast iron etc..Compared with cast iron, stainless price is higher, but thermostability is high, can bear long-standing use, is thus suitable for the glass material that glass transformation temperature is higher.It addition, the low price of cast iron, and processability is good.Therefore, the material of base material 13 can select according to the characteristic of the glass being shaped is suitable.
, for Fig. 2, the counterdie 11 of present embodiment is illustrated herein, but as another way, it is possible to for the counterdie 11 shown in Fig. 3.In Fig. 2, substrate surface 13A is forming surface 17, but in figure 3, substrate surface 13A defines overlay film 15, and the surface making this overlay film 15 is forming surface 17.
As the overlay film 15 being formed on substrate surface 13A, it is possible to enumerate such as using oxide ceramics as the membrane of oxide ceramics of main constituent or carbon film, silicon carbide film etc..
Especially by using membrane of oxide ceramics as overlay film 15, even if being the situation carrying out compression molding in the oxidizing atmosphere of high temperature, it is also possible to prevent the deterioration of overlay film 15 and then be possible to prevent the chemical of forming surface 17 and the deterioration of physical property, being suitable.
As this membrane of oxide ceramics, it is possible to use preferably comprise more than 60 mass %, more preferably contain more than 80 mass % it is preferred that containing more than 90 mass %, particularly preferably contain more than 95% the overlay film of oxide ceramics.
It addition, as this oxide ceramics, it is possible to enumerate at least one in the group being selected from being made up of silicon oxide, aluminium oxide, zirconium oxide, titanium oxide, magnesium oxide and calcium oxide.Especially from the view point of the durability of overlay film, it is preferable that silicon oxide.It should be noted that membrane of oxide ceramics 15 can be made up of any one of the simple substance of above-mentioned oxide ceramics or mixture, but it is preferred that, it is desirable to it is made up of the simple substance of silicon oxide.
It addition, as the composition beyond above-mentioned oxide ceramics, membrane of oxide ceramics such as can comprise boron nitride (BN), carborundum (SiC), aluminium nitride (AlN), ferrum oxide (Fe2O3), chromium oxide (Cr2O3), aluminum phosphate (AlPO4) etc. composition.These compositions can contain wittingly, it is also possible to inevitably (impurity levels) contains.It should be noted that when membrane of oxide ceramics 15 comprises these compositions, the total of its content is preferably below 40 mass %.If these compositions are too much, then membrane of oxide ceramics 15 has the tendency become fragile, and forming surface has the tendency deteriorated because of continuous print compression molding.
It addition, in addition to the above ingredients, membrane of oxide ceramics may be embodied in and manufactures the various oxide components that cannot get rid of or metal ingredient etc. as inevitable composition.
It addition, the thickness t of the overlay film 15 shown in Fig. 3 is preferably more than 5 μm, is more preferably more than 10 μm, more preferably more than 20 μm.It addition, the preferred upper limit of the thickness t of overlay film 15 is less than 80 μm, is more preferably less than 50 μm.If the thickness t of overlay film 15 becomes too thin, then cannot being formed concavo-convex fully in forming surface 17, the surface roughness (Rz) of forming surface 17 has the tendency lower than 10 μm.Further, forming surface 17 also has the tendency of decline for the durability of continuous print compression molding.It addition, the thickness t of overlay film 15 is thickening with Shangdi along with necessity, then there is the tendency being difficult to obtain uniform masking.
It should be noted that, the thickness t of the membrane of oxide ceramics of present embodiment indicates that the average film thickness at more than 9 places in the membrane of oxide ceramics being formed at forming surface (such as, any 9 places on 2 lines of orthogonal (each 4 points of the central point of forming surface and r/3 and 2r/3 when the radius of forming surface is set to r) by the central point of forming surface).The thickness of membrane of oxide ceramics such as SEM based on the plane of disruption of film measures or uses known ultrasonic type determining film thickness device, electromagnetic type film thickness gauge, β Radiolucent formula film thickness gauge etc. to measure.
It should be noted that when mould 11 shown in Fig. 3, substrate surface 13A can be smoother face, as long as being formed at the surface roughness (Rz) of the overlay film 15 of substrate surface 13A more than 10 μm.It addition, from the view point of improve the adaptation of base material 13 and overlay film 15, it is preferable that make thermal coefficient of expansion close by the material both selecting.
The manufacture method > of < mould
Then, an example of the manufacture method of the mould shown in Fig. 1 is illustrated.
The manufacture method of the mould of present embodiment has following operation: prepare the operation of the base material corresponding to upper die and lower die；With the surface roughness (Rz) of the forming surface of at least one made in the described upper die and lower die operation more than 10 μm.
The mould of the present embodiment so manufactured plays the quenching effect of the glass raw material after the effect and pressing that the glass raw material softened before pressing is incubated.
Hereinafter, the method for the mould making present embodiment is illustrated.It should be noted that below, illustrate for counterdie 11, eliminate mould 21 but it also may be identical with the situation of counterdie 11.
In present embodiment, first prepare the base material 13 corresponding to counterdie 11.The material of base material 13 selects according to the material (characteristic) or molding temperature etc. of the glass carrying out compression molding are suitable.It addition, the shape of base material 13 can the shape according to molding device or as the glass forming body (optical element blank) of target be suitable for selecting.
Especially the shape of substrate surface 13A, it is formed according to the mode of the shape following the glass forming body being shaped, and glass forming body is similar to the shape of the optical element as final products.Therefore, substrate surface 13A is also according to the suitable setting of shape of the optical element as final products.It can be such as convex surface shape, concave curved planar, plane etc..
Then, the concavo-convex forming surface 17 with appropriateness is formed on the surface of base material 13.Specifically, it is possible to as shown in Figure 2, formed on the surface of base material 13 appropriateness concavo-convex and as forming surface 17, it is also possible to as shown in Figure 3, on substrate surface 13A formed overlay film 15, formed have appropriateness concavo-convex forming surface 17.
Such as Fig. 2, the processing method when forming surface 17 forms appropriateness concavo-convex is not particularly limited, it is possible to enumerate such as injection (blast) processing or reversely etching and processing, employ the machining etc. of cutting element.
It addition, such as Fig. 3, material when forming overlay film 15 on substrate surface 13A, according to composition overlay film, it is possible to be suitable for selecting rubbing method or vapour deposition method, plating method etc., utilize these methods can form the overlay film 15 of the thickness with regulation and surface roughness.It should be noted that, the surface of overlay film 15 can according to carrying out film forming for appropriate concavo-convex mode in advance, film forming can also be carried out according to the mode being temporarily the surface smoothed, utilize injection processing or reverse etching and processing etc. to be processed as afterwards and there is appropriate concavo-convex forming surface 17.
Hereinafter, for the counterdie 11 shown in Fig. 3, specifically the manufacture method of the mould of present embodiment is illustrated.It should be noted that as overlay film 15, illustrate for the situation forming membrane of oxide ceramics.
In present embodiment, first prepare coating solution.In present embodiment, coating solution form membrane of oxide ceramics 15.Coating solution is constituted including at least oxide ceramics and solvent.
As oxide ceramics, it is possible to enumerate at least one in the group being selected from being made up of silicon oxide, aluminium oxide, zirconium oxide, titanium oxide, magnesium oxide and calcium oxide.Wherein, from the view point of durability, it is preferred to silicon oxide.It should be noted that oxide ceramics can only be used singly, or in combination of two or more kinds.
It addition, as oxide ceramics, it may be preferred to the powder that uses mean diameter to be less than 5 μm, the powder of more preferably use less than 1 μm.If the particle diameter of oxide ceramics becomes excessive, then there is the tendency being difficult to form uniform overlay film.
It addition, as solvent, it is possible to use water or organic solvent.
The coating solution of present embodiment at least mixed oxide pottery and solvent form.For mixed method, it does not have be particularly limited to, it is possible to use known method.It addition, for the blending ratio of oxide ceramics and solvent, also without being particularly limited to, with general coating it is also possible to regulate according to the mode becoming the desired viscosity corresponding to coating process is suitable.
It addition, coating solution can contain pottery other than the above or oxide etc. as the solid constituent beyond above-mentioned oxide ceramics.Wherein, the total content of these compositions is preferably below the 40 mass % of solid constituent entirety (including oxide ceramics).
Further, coating solution can contain various dispersant, the bonding additive such as material, plasticizer as required.The total content of these additives is desired for below the 10 mass % that coating solution is overall.
It addition, the coating solution of present embodiment preferably comprises colloidal silica as binding agent.Colloidal silica is constituted membrane of oxide ceramics with the form of silicon oxide after firing, therefore, it is possible to form firmly film.
Then, the base material 13 corresponding to counterdie 11 is prepared.Further, about substrate surface 13A, the pre-treatments such as injection processing can be implemented as required.Additionally it may be desirable to substrate surface 13A removes the refuse such as oils and fats or grindstone dust in advance.Process by implementing these, it is possible to improve the adaptation of substrate surface 13A and membrane of oxide ceramics 15.
Then, coating solution is coated substrate surface 13A [painting process].Coating process can according to suitable selections such as the surface roughnesses (Rz) of the thickness t of the membrane of oxide ceramics 15 of desire formation or forming surface 17, it is possible to use known method carries out.Such as spraying (spraycoat) method, hairbrush coating (brushcoating) method such as method, infusion process can be enumerated.
About coating weight, it is possible to according to the suitable adjustment of thickness t being intended to the membrane of oxide ceramics 15 formed.Such as, when making thickness t thickening, it is preferable that be divided into 2 times and carried out above be again coated with.If being once just coated with substantial amounts of coating solution, then dried membrane of oxide ceramics produces be full of cracks sometimes.It addition, because of the shape of base material, the thickness of dried membrane of oxide ceramics produces deviation sometimes.
Such as, as it is shown on figure 3, forming surface 17 expectation chases after from the shape of substrate surface 13A.But, as base material 13, when surface 13A is concave surface, if in a large number coating solution being coated surface 13A, then it is scattered in the recess on the 13A of surface of the oxide ceramics coagulation in coating solution and becomes easy precipitation.Its result is, for the thickness of dried membrane of oxide ceramics, compared with periphery, core is thicker, and forming surface 17 and surface 13A can produce difference in curvature sometimes.If utilizing this forming surface 17 to carry out compression molding, then in molded body, produce shape defect sometimes.
It should be noted that when being again coated with, it is desirable to coated face is carried out the dry of appropriateness, for instance preferably contact coated face with finger and confirm to have carried out the dried of appropriateness, be again coated with.
Then, the mould being coated with coating solution is dried [drying process].Baking temperature can be room temperature～200 DEG C.It addition, drying time can regulate according to the kind of solvent or coating weight are suitable, it is possible to be 1 hour～6 hours.
Afterwards, the mould fully dried for coated face is fired, thus cloth material will be coated with solidify (ablating work procedure).Firing condition can according to suitable adjustments such as the kind of oxide ceramics or thickness, and firing temperature can be 90～150 DEG C, the firing time can be 10 minutes～1 hours.
It should be noted that above-mentioned ablating work procedure is arbitrary operation.That is, it needs to mould is controlled the temperature for regulation in mold pressing procedure described later, that therefore can also pass through that heating now has mould in above-mentioned ablating work procedure concurrently fires (solidification of painting cloth material).
Profit in this way, about the counterdie 11 of a part for the mould as present embodiment, it is possible to formed on the surface of substrate surface 3A and there is the forming surface of ceramic membrane 15.Herein, membrane of oxide ceramics 15 is sealed on substrate surface 13A, even if heated, pressurization is peeled off without from base material 13 in an atmosphere.
The surface of so obtained membrane of oxide ceramics 15 has the concavo-convex of appropriateness.That is, by solidifying painting cloth material on substrate surface 13A, and the granule of sintered ceramic oxide, become the surface roughness forming surface 17 more than 10 μm.
It should be noted that, in the present embodiment, by being suitable for adjusting the concentration of coating solution or composition, the kind of oxide ceramics or particle diameter, the coating process being coated on substrate surface 13A or coating weight etc., it is possible to form the forming surface 17 with desired surface roughness (Rz).Such as having following tendency: when the concentration of coating solution is low, surface roughness becomes less；When the concentration of coating solution is high, surface roughness becomes bigger.
< grinds with the manufacture method > of glass optical component blank
The manufacture method of the grinding glass optical component blank of present embodiment includes following operation:
Prepare the operation of the mould of present embodiment；With
Mold pressing procedure, wherein, after the glass raw material being made up of optical glass being reheated under air atmosphere, utilizes described mould that the described glass raw material softened is carried out compression molding.
Hereinafter, for grinding glass lens blank, an embodiment of the manufacture method of grinding glass optical component blank (being sometimes only called " optical element blank " below) is illustrated.Specifically, with reference to Fig. 4 while an example of the mold pressing procedure of the mould employing the present embodiment shown in Fig. 1 is illustrated.It should be noted that the present invention is not by any restriction of implementation below, suitable change can be applied in the scope of the purpose of the present invention and implement.
First, as mould, prepare the mould shown in Fig. 1.That is, prepare that there is the counterdie 11 of surface roughness (Rz) forming surface 17 super more than 10 μm, the upper mould 21 with the surface roughness (Rz) forming surface 17 more than 10 μm and cylinder mould 31.Further, mould is heated in advance.The heating-up temperature of mould preferably be suitable for adjusting according to the glass raw material that is shaped, but it is desirable that, the temperature of mould is heated in advance according to the mode of the near temperature of the sag temperature (Ts) pair becoming glass raw material for molding.
On the other hand, the glass raw material 40a being processed into regulation shape (such as polyhedron-shaped, disc-shape, ellipse of revolution shape etc.), predetermined weight (weight as more than the optical element of target) of necessary amount is prepared.Material as glass raw material 40, it does not have be particularly limited to, it is possible to enumerate (1) and at least contain P, O and F and more contain B in glass ingredient as the fluorophosphate system glass of glass ingredient, (2)2O3、La2O3Boric acid lanthanide glass, (3) in glass ingredient, more contain SiO2、TiO2SiO2-TiO2It is that glass, (4) are with P2O5As main constituent and the niobium phosphate system optical glass containing the easy reducing component being made up of Nb, Ti, Bi and W.
The forming method of glass raw material 40a is not particularly limited.Can enumerate such as: the glass plate that will be shaped to tabular cut off and the pact that obtains be the sheet glass of hexahedral shape, the discoid sheet glass obtained columned glass raw material to be cut off at equal intervals, utilization undertaking mould accept the melten glass flowed down by nozzle and be then shaped to ellipse of revolution shape the sheet glass etc. carrying out cooling down and obtaining.
Then, the glass raw material 40a softened heating in advance supplies to counterdie 11.Afterwards, upper mould 21 is inserted a mould 30.In Fig. 4 (A1), upper mould 21 load that produces also is not applied to glass raw material 40a, therefore maintains the shape of the glass raw material 40a softened.
Then, by the enlarged icon of glass raw material 40a and the contact portion of forming surface 17 in Fig. 4 (A2).As shown in Fig. 4 (A2), forming surface 17 has concavo-convex (surface roughnesses more than 10 μm) of appropriateness, is fed into the protrusions contact of main and forming surface 17 before pressing of the glass raw material 40a in forming surface 17.Therefore, compared with existing smooth forming surface, when forming surface 17 of present embodiment, it is possible to reduce the contact area of the glass raw material 40a softened and forming surface 17.
In existing mould, forming surface is smoother, and the glass raw material therefore put into contacts at face place with forming surface.Therefore, when the temperature of mould is low, contact portion in glass raw material Yu forming surface, temperature declines notable, the viscosity of the glass of compression molding cannot be remained adapted to during to molding, in addition, glass raw material easily produces Temperature Distribution in the part contacted with forming surface and discontiguous part.The molding when rising of this viscosity or Temperature Distribution are compression moldings is bad or the main cause of the unfavorable condition such as the generation of strain of the generation of crackle, inside glass.
On the other hand, in the mould of present embodiment, forming surface 17 has the concavo-convex of appropriateness, thus heat is from glass raw material 40a to the mobile mitigation of forming surface 17.Its result is, it is possible to the temperature of glass raw material 40a when preventing the input of glass raw material 40a declines (viscosity risings), can fully maintain mobility and the temperature homogeneity of glass raw material 40a to when pressing.Therefore, when compression molding, it is possible to the glass raw material 40a of the mobility and temperature homogeneity with appropriateness is pressed, it is possible to increase formed precision and yields.
It addition, in order to prevent the hot sticky of glass, it is preferable that coated release agent at least one of glass raw material 40a and forming surface 17,27.As releasing agent, for instance use the Powdered releasing agent of boron nitride, aluminium oxide, silicon oxide, magnesium oxide etc..It should be noted that the mould of present embodiment has the concavo-convex of appropriateness in forming surface 17,27, therefore after the demoulding being shaped body, releasing agent easily residues in forming surface 17,27.
Then, as shown in Fig. 4 (B1), mould 21 is made to decline thus pressing glass raw material 40a, by the shape that glass raw material 40a compression molding is the forming surface shape imitating upper and lower mould, thus obtaining optical element blank 40b.
Glass raw material 40a during compression molding preferably keeps 104～106The viscosity of dPa s.Especially, the mould according to present embodiment, utilize the concavo-convex contact area reducing glass raw material 40a and forming surface 17 of forming surface 17, therefore can both remain suitable for the temperature (viscosity) of compression molding to being about to press.It should be noted that compression molding carries out in an atmosphere.
Additionally, except the such as shape with convex surface and concave surface shown in Fig. 4 (B1), as long as the shape of optical element blank 40b is biconvex shape, has convex surface and the shape of plane, the shape that has concave surface and the shape of plane, concave-concave shape etc. approximate with the shape of the glass optical component as target are just not particularly limited.
The optical element blank 40b that molding obtains takes out from mould, implements the heat treatment (annealing) for eliminating strain as required.Mould 11 according to present embodiment, it is possible to the optical element blank 40b that form variations after being made annealing treatment is few.
By the enlarged icon of the glass raw material (optical element blank 40b) after glass raw material 40a is pressed and the contact portion of forming surface 17 in Fig. 4 (B2).As shown in Fig. 4 (B2), when making mould 21 decline and glass raw material 40a is pressed, glass raw material 40a chases after from having irregular forming surface 17.Its result is, the glass raw material 40a only contacted at the protuberance place of forming surface 17 before pressing contacts with recess after pressing.
The forming surface 17 of present embodiment has the concavo-convex of appropriateness, and therefore compared with existing smooth forming surface, surface area is big.Therefore, compared with existing forming surface, when pressing, forming surface increases with the contact area of glass raw material.
Its result is, compared with existing smooth forming surface, glass raw material contacts with forming surface with bigger area, and therefore the rate of cooling of molded body is accelerated, and shape carries out with being fixed well, and form accuracy improves.
Further, the mould according to present embodiment, utilize the heat insulation effect of forming surface to be prevented from the glass raw material before pressing and produce Temperature Distribution, the temperature homogeneity of glass raw material can be kept to be quenched when pressing further.Therefore, it is difficult in the inside of glass forming body 40b produce strain, even if molded body (optical element blank) is annealed, shrinks also few, it is also possible to reduce form variations.
If so using the mould of present embodiment to make optical element blank, then can prevent crackle (so-called be full of cracks/break) when compression molding or extend bad, it is possible to obtaining, with rate of good quality rate, the optical element blank that formed precision is excellent.
Chase after from the shape of forming surface 17 it addition, use the optical element blank that the mould of present embodiment makes to have.That is, in the optical element blank of present embodiment, first type surface is for being formed face, and above-mentioned first type surface has the concavo-convex of appropriateness.The surface roughness (Rz) of the first type surface of this optical element blank is preferably more than 8 μm, is more preferably more than 10 μm, more preferably more than 20 μm, is particularly preferably more than 22 μm, is more preferably more than 25 μm.
When utilizing this optical element blank to make optical element, even if from starting the grinding stone that just use granularity is thinner, it is also possible to by being formed at the concavo-convex slip preventing grinding stone of the appropriateness of first type surface, it is possible to carry out good grinding.Utilizing this grinding, the fine crack produced when grinding will not feed through to the deep (such as rest on from surface less than 15 μm) of glass terrifically, it is easy to by fine crack removing in subsequent handling.
It should be noted that the preferred upper limit of the surface roughness of the first type surface of the optical element blank of present embodiment (Rz) is about 50 μm.When the surface roughness (Rz) of first type surface is excessive, the processing capacity of grinding/attrition process when making optical element and there is process time the tendency of increase.
That is, in the optical element blank according to present embodiment, grinding when making optical element and grinding step, it is possible to reduce processing capacity or process time, it is possible to increase the productivity ratio of optical element.
The manufacture method > of < optical element
The manufacture method of the optical element of present embodiment includes following operation:
The optical element blank made by the manufacture method of the optical element blank of present embodiment is carried out the grinding process of grinding；With
To the grinding step being ground via the grinding optical element blank of described grinding process.
As the optical element obtained by this method, it is possible to enumerate the various lens such as such as spherical lens, non-spherical lens, pack-shot lens, lens arra；Prism, diffraction grating etc..
Hereinafter, for optical lens, one embodiment of the manufacture method of optical element is illustrated.Specifically, with reference to Fig. 5 while the grinding glass lens blank 40b shown in Fig. 4 (is only called " lenticular blank " below sometimes.) grinding and grinding step illustrate.It should be noted that the present invention is not by any restriction of following embodiment, in the scope of the purpose of the present invention, it is possible to apply suitable change and implement.
Grinding process be use the grinding grinding stone such as ciamond grinder, by the technique of radius of curvature that the two sides grinding of glass optical component blank 40b is regulation.It addition, grinding step is the technique using abrasive disk, as grinding agent, the two sides of the optical element blank carrying out grinding being ground by the free abrasives such as cerium oxide.
In the step S10 shown in Fig. 5, first carry out the spherical grinding operation (CG processing) of the first type surface of lenticular blank 40b.As the curve generator (curvegenerator) processed for CG, it does not have be particularly limited to, use the known curve generators such as ciamond grinder.In this CG processes, with the processing capacities of tens of μm～hundreds of μm, the surface of lenticular blank is carried out thick grinding, according to the mode of the curvature close to final lens shape, two sides is carried out grinding.It addition, CG processing such as uses the grinding stone that particle diameter is 20～60 μm (being expressed as #800～#400 by granularity) of the abrasive particle being made up of diamond particles, while supply grinding fluid, carry out grinding.It should be noted that the particle diameter of abrasive particle is more little, the numerical value that granularity represents is more big.
Generally, in the ground such as CG processing, the surface of optical element blank after processing has regenerated countless fine cracks.The grinding stone that particle diameter of abrasive particle is big, this fine crack then more has the tendency in the deep easily involving glass, and extremely deep crackle is difficult to remove in subsequent handling (fine ginding etc.).On the other hand, when using the less grinding stone of particle diameter of abrasive particle, the fine crack produced because of grinding will not deepen (such as rest on from surface less than 15 μm) terrifically, it is easy to by fine crack removing in subsequent handling.
Therefore, from the view point of reduce processing capacity or process time, it is desirable to the grinding stone that the particle diameter of abrasive particle can be utilized less starts CG processing.But, when the grinding stone utilizing particle diameter little is processed, machined surface is more smooth, and grinding stone more easily slides, and has the tendency that cannot be carried out good processing.Therefore, when utilizing the optical element blank that existing smooth forming surface makes, it is difficult to start CG processing from the grinding stone that particle diameter is little, is therefore generally after using the grinding stone that particle diameter is big to carry out one-time surface processing, utilizes the grinding stone that particle diameter is little that appropriateness defines concavo-convex machined surface and be processed.
But, utilizing the grinding optical element blank of present embodiment, the face that is formed has had the concavo-convex of appropriateness, even if being therefore the grinding stone that particle diameter is less, it also is able to start CG processing, it is possible to reduce processing capacity and the process time of the grinding in subsequent handling and attrition process.
In following step S11, carry out the smooth processing (SM processing) based on fine ginding operation.SM processing can be the processing in a stage but it also may is multistage processing.The grinding stone used in processing as SM, it is possible to and with grinding stone and the resinoid bond grinding stone of metal adhesive or resinoid bond grinding stone can only be used.It should be noted that in the present embodiment, in these SM process, it is preferable that do not use the grinding stone of metal adhesive, and only use resinoid bond grinding stone to be processed.It addition, resinoid bond grinding stone is preferably used the grinding stone that particle diameter is 8～20 μm (being expressed as #2500～#1200 by granularity) of abrasive particle.
Then, in step s 12, it is ground processing.In grinding step, use the lapping liquid of the grinding abrasive particle (such as the free abrasive of acidifying cerium) of the particle diameter comprising less than 5 μm that surface is ground, grind several μm～ten several μm.By this grinding step, define the optical lens face of optical lens main body.
Finally, utilize step S13 to carry out centering operation, but centering operation can also be omitted according to different situations.In centering operation, for instance carry out following processing: clamp optical lens main body with a pair Lens holder and feel relieved, making lens body while its centrage rotates, with ciamond grinder etc., the lateral circle surface of lens body is ground to circular.
So can obtain the various optical lenses such as biconvex lens, biconcave lens, planoconvex lens, planoconcave lens, positive meniscus lens, falcate concavees lens.
It addition, according to application target, it is possible at the optical function topcoating cloth antireflection film of the lens obtained, total reflection film etc..
In the manufacture method of the optical lens of this present embodiment, employ the optical element blank of present embodiment, therefore, it is possible to the processing capacity significantly reduced in above-mentioned grinding process and grinding step and process time, productivity ratio can be improved.
It should be noted that the present invention is not limited by above-mentioned embodiment, it is possible to carry out various change within the scope of the invention.
Such as, in the mould of above-mentioned present embodiment, it is shown that only form the concavo-convex example of appropriateness in the forming surface of counterdie He upper mould, but as long as compression molding can successfully be carried out, for cylinder mould, it is also possible to form the concavo-convex of appropriateness.
It addition, in Fig. 1 of above-mentioned embodiment, the mould for making grinding glass lens blank is that example is illustrated, but the invention is not restricted to this mould.That is, the mould of the present invention is suitable as the mould used in the making of the optical element blank of various kinds.
[embodiment]
1. mould'sPrepare
< mould I >
As the base material of mould, prepare upper die and lower die and the cylinder mould of stainless steel.
The substrate surface of upper die and lower die is not processed and directly as forming surface.In so obtained mould I, the surface roughness (Rz) of forming surface is 2 μm.It should be noted that the mensuration of the surface roughness of forming surface (Rz) uses Mitutoyo society contour outline measuring set (formtracer) CS3000, carries out based on JIS standard B0601.Same below.
< mould II >
First, using silicon oxide as main constituent, colloidal silica is added the water as solvent as being coated with in cloth material of binding agent, be sufficiently stirred for, obtain the coating solution of desired viscosity.
Then, as the base material of mould, upper die and lower die and the cylinder mould of stainless steel are prepared.
The coating solution being adjusted to the viscosity of appropriateness in advance is filled to air-brush (airbrush), whole of the face corresponding to forming surface in the surface of upper die and lower die, coating solution atomization is sprayed equably.
Make the face being coated with coating solution dried at normal temperatures, 2 sprayings repeatedly.Afterwards, the mould defining coating material is put in heating furnace, under air atmosphere, fires 1 hour in 150 DEG C.
In so obtained mould II, the surface roughness (Rz) of forming surface is 11 μm.
< mould III >
For mould III, improving the concentration of coating solution and making the surface roughness (Rz) of forming surface is 25 μm, in addition, utilizes the method same with mould II to make.
< mould IV >
For mould IV, improving further the concentration of coating solution and making the surface roughness (Rz) of forming surface is 40 μm, in addition, utilizes the method system same with mould II.
< mould V >
As the base material of mould, prepare upper die and lower die and the cylinder mould of stainless steel.
Utilize sandblasting (sandblast) that the forming surface of upper die and lower die is processed.
In so obtained mould V, the surface roughness (Rz) of forming surface is 21 μm.
2. the making of lenticular blank
Then, above-mentioned mould I～V is used to make lenticular blank.When using arbitrary mould, all carry out according to the production order of following lenticular blank.
< lenticular blank A >
First, fluorophosphate system glass raw material (ellipse of revolution shape, quality 16g, Tg=404 DEG C, Ts=444 DEG C) is prepared.Then, at the releasing agent (boron nitride) of the surface coated powder shape of glass raw material.It addition, at the softening pallet also coated release agent of reheating device.
The glass raw material being coated with releasing agent is supplied to pallet, puts in the heating furnace being set as 450～700 DEG C, reheat under air atmosphere.Optical glass for mold press molding raw material softening after reheating is for about 105The viscosity of dPa s.
Then, by reheating, use the mould glass raw material to having softened to carry out compression molding under air atmosphere, make the lenticular blank A of one side convex, diameter 40mm, height 5mm.It should be noted that the forming surface at mould has been pre-coated with releasing agent, mould has heated in advance according to the mode for the temperature near sag point (Ts).
3. evaluate (1)
About mould I～V, carry out the evaluation of mould.Specifically, utilize said method to make the lenticular blank of some (sum of the blank of making is shown in table 1) respectively, the incidence rate of the defective products of the lenticular blank obtained has been evaluated.Especially, about the incidence rate of defective products, have rated the detailed content of defective products.Further, the surface roughness (Rz) of the first type surface of obtained lenticular blank is determined.Result is shown in table 1.
It should be noted that the scope of surface roughness (Rz) when the surface roughness of the lenticular blank shown in table 1 (Rz) illustrates the lenticular blank using each mould to make specified quantity.It should be noted that the mensuration of the surface roughness (Rz) at the first type surface place of obtained lenticular blank uses Mitutoyo society contour outline measuring set CS3000, carries out based on JIS standard B0601.
[table 1]
As shown in table 1, using when being equivalent to the mould I of comparative example of the present invention, in the lenticular blank obtained, a large amount of bad or be full of cracks of producing to extend are broken, and create the defective products of 16%.
On the other hand, when using the mould II～V of the present invention, in the lenticular blank obtained, few by the break generation of the defective products caused of the bad or be full of cracks of extending, defective products rate is less than 1.3%.
4. evaluate (2)
Then, the lenticular blank obtained about use mould I, mould II and mould III, the evaluation of the relation of the temperature that carrying out chaps breaks with mould.
Specifically, temperature when being shaped the heating of mould closely controls, the temperature of respective mould is adjusted to the temperature (380～440 DEG C) of the regulation shown in table 2, in addition, has made lenticular blank A in the same manner as above-mentioned production order.Further, following condition is utilized to make lenticular blank B.
< lenticular blank B >
First, boric acid group of the lanthanides glass raw material (ellipse of revolution shape, quality 21g, Tg=655 DEG C, Ts=690 DEG C) is prepared.Then, at the releasing agent (boron nitride) of the surface coated powder shape of glass raw material.It addition, at the softening pallet also coated release agent of reheating device.
The glass raw material being coated with releasing agent is supplied to pallet, puts in the heating furnace being set as 700～900 DEG C, reheat under air atmosphere.Optical glass for mold press molding raw material softening after reheating is for about 105The viscosity of dPa s.
Then, by reheating, use the mould glass raw material to having softened to carry out compression molding under air atmosphere, make the lenticular blank B of one side convex, diameter 30mm, height 4mm.It should be noted that the forming surface at mould has been pre-coated with releasing agent, mould has heated in advance according to the mode of the temperature (680～740 DEG C) for table 2.
The lenticular blank obtained creating be full of cracks when breaking, being evaluated as molding bad.Evaluation result is shown in table 2.It should be noted that in table 2, × mean that molding is bad, zero mean that molding is good.
[table 2]
As shown in table 2, in being equivalent to the mould I of comparative example of the present invention, the temperature of mould only slightly moves to low temperature side, it is confirmed that the generation broken to be full of cracks.
As mould I, it is suppressed that when the molding in the region of low temperature side is bad, it is necessary to improve the temperature of mould, if but the temperature of mould is high, then and easily produce the hot sticky of glass and mould, and the form variations after molding becomes greatly.Therefore, it is known that use mould I to make lenticular blank and can cause the decline of productivity ratio and quality.
On the other hand, in mould II and the III of the present invention, even if the temperature confirming mould slightly moves to low temperature side it also is able to carry out good molding.
5. evaluate (3)
Then, the lenticular blank A obtained about use mould I, mould III, have rated the form error of the 1st and the 2nd.Specifically, use the simple and easy curvemeter of ring type (Mitutoyo society DigimaticIndicatorID-CX and OriginalRingGauge), the Δ H of lenticular blank A is measured, using this Δ H index as shape evaluation.Result is shown in Fig. 6.
As shown in Fig. 6 (A), in using the mould I of the comparative example being equivalent to the present invention lenticular blank A made, the 1st and the 2nd deviation that all there is Δ H-number, i.e. the shape having confirmed lenticular blank exists bigger deviation.
On the other hand, utilizing the mould III of the present invention, as shown in Fig. 6 (B), in the 1st and the 2nd of lenticular blank A, Δ H-number is all summarized in narrower scope, has confirmed the raising of form accuracy.
6. evaluate (4)
Then, the lenticular blank A obtained about use mould I, mould III, has evaluated the form error of the 1st and the 2nd after annealing.Specifically, use the simple and easy curvemeter of ring type (ibid), the Δ H of lenticular blank A is measured, using this Δ H as annealing before form error.Then, Tg-10 DEG C, 120 minutes, under air atmosphere when this lenticular blank A is heated, be annealed processing, again measure Δ H, as the form error after annealing.Result is shown in Fig. 7.
As shown in Fig. 7 (A), in the lenticular blank A using the mould I of comparative example being equivalent to the present invention and make, after annealing, also all creating the deviation of Δ H-number the 1st and the 2nd face, there is relatively large deviation in the shape namely having confirmed lenticular blank.Further, also confirm shape in the front and back of annealing and create deviation.
On the other hand, in the lenticular blank A using the mould III of the present invention and make, as shown in Fig. 7 (B), after annealing, the 1st and the 2nd middle Δ H-number are all summarized in narrower scope, have namely confirmed the raising of form accuracy.Further, the deviation of the shape having confirmed annealing front and back is also few.
The explanation of symbol
11 ... counterdie
21 ... upper mould
13,23 ... base material
13A, 23A ... substrate surface
15 ... overlay film (membrane of oxide ceramics)
17,27 ... forming surface
30 ... cylinder mould
40a ... the glass raw material softened
40b ... grind and use glass optical component blank

Claims (5)

1. a mould, this mould at least has upper die and lower die and for manufacturing grinding glass optical component blank, and wherein, the surface roughness (Rz) of the forming surface of at least one in described upper die and lower die is more than 10 μm.
2. mould as claimed in claim 1, wherein, the surface roughness (Rz) of described forming surface is less than 50 μm.
3. mould as claimed in claim 1 or 2, it for carrying out compression molding to the glass raw material softened in air atmosphere.
4. grinding the manufacture method using glass optical component blank, it includes following operation:
The operation of preparation mould according to any one of claims 1 to 3；With
Mold pressing procedure, wherein, after the glass raw material being made up of optical glass being reheated under air atmosphere, utilizes described mould that the described glass raw material softened is carried out compression molding.
5. a manufacture method for optical element, it includes following operation:
The grinding glass optical component blank that manufacture method manufacture described in claim 4 is obtained carries out the grinding process of grinding；With
The grinding step that grinding glass optical component blank through described grinding process is ground.
CN201380081402.2A 2013-12-12 2013-12-12 Grinding glass optical component blank molding die, the manufacturing method of grinding glass optical component blank and the manufacturing method of optical element Active CN105793201B (en)

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