CN105793201B - Grinding glass optical component blank molding die, the manufacturing method of grinding glass optical component blank and the manufacturing method of optical element - Google Patents
Grinding glass optical component blank molding die, the manufacturing method of grinding glass optical component blank and the manufacturing method of optical element Download PDFInfo
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- CN105793201B CN105793201B CN201380081402.2A CN201380081402A CN105793201B CN 105793201 B CN105793201 B CN 105793201B CN 201380081402 A CN201380081402 A CN 201380081402A CN 105793201 B CN105793201 B CN 105793201B
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- 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
A kind of the purpose of the present invention is to provide mouldabilities grinding excellent, that yields can be improved glass optical component blank molding die.Molding die of the invention at least has upper die and lower die, and the molding die is for manufacturing grinding glass optical component blank, wherein the surface roughness (Rz) of the forming surface of at least one of described upper die and lower die is more than 10 μm.
Description
Technical field
The present invention relates to the systems of grinding glass optical component blank molding die, grinding glass optical component blank
Make the manufacturing method of method and optical element.
Background technique
In recent years, along with the diversification of optical element and extensiveization, the optical element of glass system needs mentioning
Height, and it is also desirable that raising productivity.
As the forming method of glass optical component, such as it is widely used for reheating compression molding method etc..Reheat mould
In molded method, (" glass raw material " is only called sometimes below to the optical glass raw material softened using molding die.)
It is pressed and molded, production grinding glass optical component blank (is only called " optical element blank " sometimes below.), to its into
Row grinding/attrition process and obtain optical element (optical lens etc.).
In this reheating compression molding method, in order to which the processing capacity for generating grinding/grinding is few, it is expected that making optical element base
The shape of material is similar to the shape of the optical element as target.Therefore, under normal circumstances, the shape of optical element blank is determined
Molding die forming surface be similar to optical element final shape (such as final products be optical lens in the case where lens
Curvature), and be more smooth face (patent document 1).But it even if being this forming surface, is still unable to fully reduce processing
Amount.
In general, moderately pressing the glass raw material softened using forming surface in compression molding, pass through the stream of glass
It moves property and is shaped to defined shape.But if the temperature of glass raw material declines, the viscosity of glass rises, therefore loses
Mobility, it is difficult to chase after from forming surface.There are following problems for its result: cannot achieve desired shape, formed precision decline.
The decline of this formed precision especially can molding die when not being pressed and molded suitably temperature adjustment
In the case where generate.That is, in the case that the temperature of molding die is lower than the glass raw material softened, it is former by forming surface and glass
The viscosity of the contact surface of material, the temperature dramatic decrease of glass raw material, glass rises.As a result, glass raw material is to mould
It cannot keep the viscosity of good glass when pressure, glass raw material is unable to fully chase after from forming surface, generate and as target
The form error of shape.Between 2 or more optical element blanks, this form error will lead to form variations.
If this form error or form variations be it is a little, can be by the grinding when manufacturing optical element/grind
Stock removal is set in grinder sequence more to adjust.But if increasing stock removal, processing capacity increases, therefore will lead to processing
The long-time of time and the consume of material.
In addition, be difficult to be adjusted by grinding if form error becomes excessive, thus as standard outside
The formed body of (extend bad) and removed from grinding process.Its result leads to the deterioration of yields.
In addition to this, in the case where the glass raw material softened being put into the forming surface to low temperature, sometimes at
The Temperature Distribution of the contact surface of the glass raw material of type face contact and part generation glass raw material in addition to this, especially exists
The part of viscosity decline cracks (crack) because of pressing sometimes.This crackle (so-called cracking rupture) will lead to
The deterioration of yields.
Existing technical literature
Patent document
Patent document 1: special open 2001-019446 bulletin
Summary of the invention
Problems to be solved by the invention
The present invention is completed in view of this actual conditions, and that its purpose is to provide a kind of mouldabilities is excellent, can be improved
The grinding of yields glass optical component blank molding die.
The means used to solve the problem
In order to solve the above problems, deep experimental study has been repeated in the present inventor, as a result, it has been found that, by
The forming surface of pattern tool forms appropriate bumps, can prevent the generation of crackle when compression molding and can reduce formed body
Form variations and extend it is bad, so as to complete the present invention.
Main points of the invention are as follows.
[1] a kind of molding die, the molding die at least have upper die and lower die and for manufacturing grinding Glass optical
Element blank, wherein the surface roughness (Rz) of the forming surface of at least one of above-mentioned upper die and lower die is more than 10 μm.
[2] molding die as described in above-mentioned [1], wherein the surface roughness (Rz) of above-mentioned forming surface is 50 μm or less.
[3] molding die as described in above-mentioned [1] or [2] is used in air atmosphere to the glass former material softened
Material is pressed and molded.
[4] a kind of grinding manufacturing method of glass optical component blank comprising following processes:
Prepare the process of molding die described in any one of above-mentioned [1]~[3]；With
Mold pressing procedure, wherein after being reheated under air atmosphere to the glass raw material being made of optical glass, benefit
The above-mentioned glass raw material softened is pressed and molded with above-mentioned molding die.
[5] a kind of manufacturing method of optical element comprising following processes:
The mill that the grinding that the manufacturing method as described in above-mentioned [4] manufactures is ground with glass optical component blank
Cut process；With
The grinding process that grinding through above-mentioned grinding process is ground with glass optical component blank.
Invention effect
Molding die according to the present invention can reduce the hair for forming bad (such as cracking/rupture or extend bad etc.)
Raw or formed body form variations, can efficiently make the grinding glass sub-prime blank of better quality.
Detailed description of the invention
Fig. 1 is the schematic diagram for showing an example of molding die of an embodiment of the invention.
Fig. 2 is the sectional view for amplifying the lower die as a part of molding die shown in FIG. 1.
Fig. 3 is the sectional view for amplifying the lower die as a part of the molding die of another embodiment of the present invention.
Fig. 4 is the schematic diagram for showing an example of mold pressing procedure of the molding die using an embodiment of the invention.
Fig. 5 is the flow chart for showing the process for manufacturing optical lens with glass lens blank by grinding.
Fig. 6 is the shape of the molding die shown using embodiment and comparative example and the grinding glass lens blank made
The distribution map of deviation.
Fig. 7 is to show the grinding for making the molding die using embodiment and comparative example to be carried out with glass lens blank
The distribution map of form variations after annealing.
Specific embodiment
Molding die of the invention at least has upper die and lower die, is for manufacturing grinding glass optical component blank
The molding die of (being only called " optical element blank " sometimes below), wherein at least one of above-mentioned upper die and lower die at
The surface roughness (Rz) in type face is more than 10 μm.
According to this molding die of the invention, grinding is manufactured being pressed and molded to the glass raw material softened
When with glass optical component blank, the generation or molding for forming bad (such as cracking/rupture or extend bad etc.) can be reduced
The form variations of body, the grinding glass optical component blank that can efficiently make better quality.Further, through the invention
The grinding of molding die production is excellent in terms of form accuracy with glass optical component blank, therefore in the mill as subsequent handling
Cut/grinding process in can reduce processing capacity and process time, the productivity in the manufacturing process of optical element can be improved.
Hereinafter, to molding die and its manufacturing method of the invention and having used the stamper of molding die of the invention
Sequence (manufacturing method of optical element blank) and the manufacturing method of optical element are described in detail, but the present invention is not by following
Embodiment any restriction, suitable change can be applied in the range of the purpose of the present invention to implement.It needs to illustrate
, about the place of repeated explanation, suitably omit the description sometimes, but be not used to limit the purport of invention.
< molding die >
Hereinafter, on one side referring to Fig.1~Fig. 3 while be directed at one embodiment of the present invention and be illustrated.It should be noted that figure
In identical or corresponding portion mark identical label and no longer its explanation repeatedly.
Fig. 1 is the schematic diagram for showing an example of molding die of an embodiment of the invention.Molding cited by Fig. 1
Mold by with forming surface upper mold 21 and lower die 11, be the cricoid of substantially coaxial shape by the upper mold 21 and 11 regulation of lower die
Cylinder mould 30 is constituted, and the surface roughness (Rz) of the respective forming surface 27,17 of upper mold 21 and lower die 11 is more than 10 μm.
It should be noted that cylinder mould 30 is arbitrary component parts in the molding die of present embodiment.That is, about cylinder
Mould 30 is also not necessary in the case where being substantially coaxial shape for upper mold 21 and 11 regulation of lower die using other methods.
In addition, in the molding die of present embodiment, as long as the table of at least any one forming surface of lower die 11 and upper mold 21
Surface roughness (Rz) is more than 10 μm, it is desirable to which preferably at least the forming surface of lower die 11 has the surface more than 10 μm thick
The forming surface of the two of rugosity (Rz), more preferable lower die 11 and upper mold 21 has the surface roughness (Rz) more than 10 μm.
Then, by taking lower die shown in Fig. 2 as an example, the molding die of present embodiment is described in detail.Fig. 2 is will to make
The sectional view amplified for the lower die 11 of a part of molding die shown in FIG. 1.It should be noted that being omitted about upper mold 12
Illustrate, but can be with lower die 11 the case where it is identical.
As shown in Fig. 2, one lower die 11 of the molding die as present embodiment has forming surface 17, the forming surface
17 have the bumps of appropriateness (surface roughness (Rz) is more than 10 μm).
It, can also even if the glass raw material softened is fed into lower die 11 according to the lower die 11 of this present embodiment
The contact area with glass raw material is reduced with the bumps by forming surface 17.Accordingly it is possible to prevent the temperature of glass raw material
Degree decline (viscosity rising) due to the contact portion with forming surface, can reduce and forming surface not in contact with part temperature difference
(differences in viscosity).As a result, can sufficiently keep having softened until when deforming glass raw material using compression molding
Glass raw material mobility and temperature uniformity.
On the other hand, according to this lower die 11, when glass raw material is deformed because of compression molding, the glass former material that has softened
Material imitates the bumps of forming surface 17 and deforms, therefore can increase the contact area of glass raw material Yu forming surface 17.Its result
Glass raw material can be rapidly quenched, therefore shape is fixed well, and then glass raw material is whole by equably cold
But, it therefore is also possible to prevent to generate strain (deformation) in inside glass.
The yields of the formed body (optical element blank) obtained using the molding die of this present embodiment is high, molding
Precision is excellent, and the form variations after annealing are few.Therefore, the processing capacity carried out when being ground/grinding can be reduced in subsequent handling.
The surface roughness (Rz) of the forming surface 17 of the lower die of present embodiment is more than 10 μm, and preferably 12 μm or more, more
Preferably 20 μm or more.In the molding die of present embodiment, by making the surface roughness (Rz) of forming surface be above-mentioned model
It encloses, the uniform of glass raw material can be obtained in the heat insulation effect of the glass raw material softened before molding in molding
Quenching effect.
However, the surface roughness (Rz) of forming surface is in 10 μm of situations below, glass raw material and forming surface are connect
Contacting surface product increases, and therefore, it is difficult to the heat insulation effects of the glass raw material softened.Therefore, if being carried out using this forming surface
Compression molding is then easy to produce cracking/rupture or bad, yields decline of extending, and after-contraction after formed precision and annealing
Deteriorate, therefore the form variations of obtained optical element blank have bigger tendency.
In the present embodiment, the upper limit of the surface roughness (Rz) of forming surface 17 is not particularly limited, but preferably 50 μ
M or less, more preferably 40 μm or less, further preferably 30 μm or less.The surface roughness of forming surface 17 is bigger, then acquired
Formed body surface roughness (Rz) also have bigger tendency.Therefore, in grinding/grinding process when making optical element
Processing capacity have increased tendency.
It should be noted that in the present embodiment, surface roughness (Rz) refers to based on JIS standard B0601 in 2001
Maximum height (identical as the Rmax meaning based on nineteen eighty-two JIS standard B0601).The Rz is the concave-convex minimum place on surface
With the difference in highest place.The measurement of surface roughness (Rz) can use gimmick based on JIS standard, by well known measurement dress
It sets to measure.
Additionally it may be desirable to which the bumps of forming surface 17 are preferably uniformly formed in the molding die of present embodiment
In the entire surface of forming surface 17.
In the present embodiment, in lower die 11, make the surface 13A forming surface 17 of substrate 13.The shape of this surface 13A
It is formed in the way of the shape for following glass forming body (optical element blank), the shape of the glass forming body is to be similar to
The shape of optical element as final products.It can be cited for example that convex surface shape, concave curved planar, planar etc..Further, at
Type face 17 has the bumps of appropriateness, therefore the surface roughness (Rz) of substrate surface 13A is more than 10 μm.
In addition, the material of substrate 13 can be according to suitable choosings such as the hardness or glass transformation temperature Tg for carrying out molding glass
It selects, it can be cited for example that stainless steel, cast iron etc..Compared with cast iron, the price of stainless steel is higher, but heat resistance is high, is able to bear
Long-standing use, therefore it is suitable for the higher glass material of glass transformation temperature.In addition, cast iron is cheap, and processability
It is good.Therefore, the material of substrate 13 can be suitable for selection according to the characteristic for carrying out molding glass.
Herein, the lower die of present embodiment 11 is illustrated by taking Fig. 2 as an example, but can is Fig. 3 as another way
Shown in lower die 11.In Fig. 2, substrate surface 13A is forming surface 17, but in Fig. 3, overlay film 15 is formd on substrate surface 13A,
Make the surface forming surface 17 of the overlay film 15.
As the overlay film 15 being formed on substrate surface 13A, it can be cited for example that using oxide ceramics as principal component
Membrane of oxide ceramics or carbon film, silicon carbide film etc..
Especially by using membrane of oxide ceramics as overlay film 15, even if to carry out mould in the oxidizing atmosphere of high temperature
Molded situation, be also possible to prevent the deterioration of overlay film 15 so that can prevent forming surface 17 chemically with it is physical bad
Change, is suitable.
As this membrane of oxide ceramics, it can be used and preferably comprise 60 mass % or more, further preferably 80 mass %
Above, further preferably 90 mass % or more, particularly preferably containing 95% or more oxide ceramics overlay film.
In addition, as this oxide ceramics, it can be cited for example that selected from by silica, aluminium oxide, zirconium oxide, oxidation
At least one of titanium, magnesia and group of calcium oxide composition.Especially from the viewpoint of the durability of overlay film, preferably aoxidize
Silicon.It should be noted that membrane of oxide ceramics 15 can be made of any one of the simple substance of above-mentioned oxide ceramics or mixture,
, but it is preferred that expectation is made of the simple substance of silica.
In addition, as the ingredient other than above-mentioned oxide ceramics, membrane of oxide ceramics for example may include boron nitride (BN),
Silicon carbide (SiC), aluminium nitride (AlN), iron oxide (Fe2O3), chromium oxide (Cr2O3), aluminum phosphate (AlPO4) etc. ingredients.These at
Dividing intentionally to contain, and can also inevitably (impurity levels) contain.It should be noted that membrane of oxide ceramics 15 wraps
In the case where these ingredients, total preferably 40 mass % or less of content.If these ingredients are excessive, oxide ceramics
Film 15 has the tendency to become fragile, and forming surface has the tendency deteriorated because being continuously pressed and molded.
In addition, in addition to the above ingredients, membrane of oxide ceramics may be embodied in the various oxides that cannot exclude in manufacture
Ingredient or metal component etc. are used as inevitable ingredient.
In addition, the film thickness t of overlay film 15 shown in Fig. 3 is preferably 5 μm or more, is more preferably 10 μm or more, is further preferred
It is 20 μm or more.In addition, the preferred upper limit of the film thickness t of overlay film 15 is 80 μm or less, more preferably 50 μm or less.If overlay film 15
Film thickness t become too thin, then can not form sufficient bumps in forming surface 17, the surface roughness (Rz) of forming surface 17 has low
In 10 μm of tendency.Further, forming surface 17 also has the durability being continuously pressed and molded the tendency of decline.In addition,
The film thickness t of overlay film 15 is thickend with necessity with Shangdi, then has the tendency for being difficult to uniformly be film-made.
It should be noted that the film thickness t of the membrane of oxide ceramics of present embodiment is the oxidation for indicating to be formed in forming surface
In object ceramic membrane 9 at (for example, on 2 lines directly handed over by the central point of forming surface any 9 at the (center of forming surface
Each 4 points of point and r/3 and 2r/3 when the radius of forming surface to be set as to r)) more than average film thickness.Membrane of oxide ceramics
Film thickness for example measures based on the SEM of the plane of disruption of film or uses well known ultrasonic type determining film thickness device, electromagnetic type film thickness
Meter, β Radiolucent formula film thickness gauge etc. measure.
It should be noted that substrate surface 13A can be smoother face in the case where molding die 11 shown in Fig. 3,
As long as being formed in the surface roughness (Rz) of the overlay film 15 of substrate surface 13A more than 10 μm.In addition, from 13 He of substrate is improved
From the perspective of the adaptation of overlay film 15, preferably make thermal expansion coefficient close by the material of both selections.
The manufacturing method > of < molding die
Then, an example of the manufacturing method of molding die shown in FIG. 1 is illustrated.
The manufacturing method of the molding die of present embodiment has following processes: preparing the substrate for corresponding to upper die and lower die
Process；With the process of surface roughness (Rz) more than 10 μm for the forming surface for making at least one of described upper die and lower die.
The glass raw material softened before pressing is protected in the molding die performance of the present embodiment so manufactured
The effect of temperature and the quenching effect of the glass raw material after pressing.
Hereinafter, being illustrated to the method for the molding die of production present embodiment.It should be noted that hereinafter, following
Be illustrated for mould 11, be omitted upper mold 21, but can also be with lower die 11 the case where it is identical.
In present embodiment, prepare the substrate 13 for corresponding to lower die 11 first.The material of substrate 13 is according to being molded into
The suitable selection such as the material (characteristic) of the glass of type or molding temperature.In addition, the shape of substrate 13 can be filled according to molding
It sets or the shape of the glass forming body (optical element blank) as target is suitable for selection.
The especially shape of substrate surface 13A is come in the way of following the shape for carrying out molding glass forming body
It is formed, glass forming body is similar to the shape of the optical element as final products.Therefore, substrate surface 13A is also according to conduct
The shape of the optical element of final products is suitable for setting.It such as can be convex surface shape, concave curved planar, planar etc..
Then, the concave-convex forming surface 17 with appropriateness is formed on the surface of substrate 13.Specifically, can as Fig. 2 that
Sample, form appropriate bumps on the surface of substrate 13 and as forming surface 17, can also be as shown in Figure 3, on substrate surface 13A
Overlay film 15 is formed, the concave-convex forming surface 17 with appropriateness is formed.
Such as Fig. 2, the processing method when forming surface 17 forms appropriate bumps is not particularly limited, it can be cited for example that spray
Penetrate (blast) processing or reversed etching and processing, the machining for having used cutting element etc..
It,, can be with according to the material for constituting overlay film in the case where forming overlay film 15 on substrate surface 13A in addition, such as Fig. 3
It is suitable for selecting rubbing method or vapour deposition method, plating method etc., can be formed using these methods with defined film thickness and rough surface
The overlay film 15 of degree.It should be noted that the surface of overlay film 15 can form a film in the way of the bumps for being in advance appropriateness,
Can by temporarily for smooth surface in the way of form a film, be processed as later using injection processing or reversed etching and processing etc.
Concave-convex forming surface 17 with appropriateness.
Hereinafter, specifically being said to the manufacturing method of the molding die of present embodiment by taking lower die 11 shown in Fig. 3 as an example
It is bright.It should be noted that being illustrated in case where forming membrane of oxide ceramics as overlay film 15.
In present embodiment, prepare coating solution first.In present embodiment, membrane of oxide ceramics is formed by coating solution
15.Coating solution includes at least oxide ceramics and solvent and constitutes.
As oxide ceramics, it can be cited for example that selected from by silica, aluminium oxide, zirconium oxide, titanium oxide, magnesia and
At least one of the group of calcium oxide composition.Wherein, from the viewpoint of durability, preferably silica.It should be noted that
Oxide ceramics can be used only a kind, two or more can also be applied in combination.
In addition, it is preferable to use average grain diameter being 5 μm of powder below as oxide ceramics, more preferably using 1 μm
Powder below.If the partial size of oxide ceramics becomes excessive, there is the tendency for being difficult to be formed uniform overlay film.
In addition, water or organic solvent can be used as solvent.
The coating solution of present embodiment at least mixed oxide ceramics and solvent form.For mixed method, without spy
It does not limit, well known method can be used.In addition, the blending ratio of oxide ceramics and solvent is also not particularly limited,
With general coating it is also possible to be suitable for adjusting in the way of becoming the desired viscosity corresponding to coating method.
In addition, can be containing ceramics other than the above or oxide etc. as other than above-mentioned oxide ceramics in coating solution
Solid component.Wherein, the total content of these ingredients is preferably 40 mass % of solid component whole (including oxide ceramics)
Below.
Further, being coated in solution can according to need containing additives such as various dispersing agents, bonding material, plasticizer.This
The total content of a little additives is desired for the 10 mass % or less of coating solution entirety.
In addition, the coating solution of present embodiment preferably comprises colloidal silicon dioxide as binder.Colloidal silicon dioxide
Membrane of oxide ceramics is constituted in the form of silica after firing, therefore is capable of forming firm film.
Then, prepare the substrate 13 for corresponding to lower die 11.Further, it about substrate surface 13A, can be implemented as needed
The pre-treatments such as injection processing.Additionally it may be desirable to which substrate surface 13A removes the wastes such as degreasing or grindstone dust in advance.Pass through implementation
These processing, can be improved the adaptation of substrate surface 13A Yu membrane of oxide ceramics 15.
Then, by coating solution coating in substrate surface 13A [painting process].Coating method can be according to the oxygen to be formed
The suitable selections such as the surface roughness (Rz) of the film thickness t of compound ceramic membrane 15 or forming surface 17, can use well known method into
Row.It can be cited for example that the methods of spraying (spray coat) method, hairbrush coating (brush coating) method, infusion process.
It can be suitable for adjustment according to the film thickness t for the membrane of oxide ceramics 15 to be formed about coating weight.Such as make film thickness t
In the case where thickeing, it is preferably divided into 2 times or more and is coated again.If once just coating is a large amount of is coated with solution, after drying
Membrane of oxide ceramics generate cracking sometimes.In addition, the film thickness of the membrane of oxide ceramics after drying is sometimes because of the shape of substrate
Deviation can be generated.
For example, as shown in figure 3, the expectation of forming surface 17 is chased after from the shape of substrate surface 13A.But as substrate 13,
In the case that surface 13A is concave surface, if will largely be coated with solution coating in surface 13A, the oxidation being scattered in coating solution
Object ceramics are aggregated the recess portion on the 13A of surface and become easy precipitating.As a result, for the membrane of oxide ceramics after drying
For film thickness, compared with periphery, central part is thicker, and forming surface 17 and surface 13A can generate difference in terms of curvature sometimes.If
It is pressed and molded using this forming surface 17, then generates shape defect sometimes in formed body.
It should be noted that carrying out in the case where coating again, it is expected that carrying out the drying of appropriateness to coated face, such as preferably
After the drying for having carried out appropriateness with finger contact coated face confirmation, coated again.
Then, [drying process] is dried to the molding die for being coated with coating solution.Drying temperature can be room temperature
~200 DEG C.In addition, drying time can be suitable for adjusting according to the type or coating weight of solvent, it can be 1 hour~6 hours left sides
It is right.
Later, the sufficiently dry molding die of coated face is fired, so that coating material solidification (is fired work
Sequence).Firing condition can according to the suitable adjusting such as the type of oxide ceramics or film thickness, firing temperature can for 90~150 DEG C,
Firing time can be 10 minutes~1 hour or so.
It should be noted that above-mentioned ablating work procedure is arbitrary process.That is, it needs to will molding in aftermentioned mold pressing procedure
Mold control is defined temperature, therefore the burning of the molding die in above-mentioned ablating work procedure can also be had both by heating at this time
It makes (solidification of coating material).
With this method, the lower die 11 about a part of the molding die as present embodiment, can be in substrate
The surface of surface 3A forms the forming surface with ceramic membrane 15.Herein, membrane of oxide ceramics 15 is sealed on substrate surface 13A,
It will not be removed from substrate 13 being heated, pressurizeing in an atmosphere.
The surface of the obtained membrane of oxide ceramics 15 has the bumps of appropriateness.That is, by solid on substrate surface 13A
Change coating material, and the particle of sintered ceramic oxide, become the forming surface 17 that surface roughness is more than 10 μm.
It should be noted that in the present embodiment, by being suitable for that the concentration for adjusting coating solution or composition, oxide are made pottery
The type or partial size of porcelain, the coating method being coated on substrate surface 13A or coating weight etc., can form with desired table
The forming surface 17 of surface roughness (Rz).Such as with following tendency: be coated with solution concentration it is low in the case where, surface roughness become
It obtains smaller；It is coated in the highly concentrated situation of solution, surface roughness becomes larger.
The < grinding manufacturing method > of glass optical component blank
The manufacturing method of the grinding glass optical component blank of present embodiment includes following processes:
Prepare the process of the molding die of present embodiment；With
Mold pressing procedure, wherein after being reheated under air atmosphere to the glass raw material being made of optical glass, benefit
The glass raw material softened is pressed and molded with the molding die.
Hereinafter, (being only called sometimes below by taking grinding glass lens blank as an example to grinding glass optical component blank
" optical element blank ") an embodiment of manufacturing method be illustrated.Specifically, being directed at while referring to Fig. 4 makes
It is illustrated with an example of the mold pressing procedure of the molding die of present embodiment shown in FIG. 1.It should be noted that of the invention
Not by any restriction of following implementation, can apply in the range of the purpose of the present invention is suitable for change to implement.
Firstly, preparing molding die shown in FIG. 1 as molding die.That is, preparation is more than with surface roughness (Rz)
The lower die 11 of 10 μm of super forming surfaces 17, upper mold 21 and cylinder mould with the forming surface 17 of surface roughness (Rz) more than 10 μm
30.Further, molding die is heated in advance.The heating temperature of molding die is preferably according to the molding glass raw material of progress
Being suitable for adjustment, but it is desirable that, the temperature of molding die according to the slackened temperature (Ts) for becoming glass raw material for molding
The mode for paying close temperature is heated in advance.
On the other hand, prepare necessary amount is processed into regulation shape (such as polyhedron-shaped, disc-shape, rotation
Elliptical shape etc.), the glass raw material 40a of predetermined weight (as the weight more than optical element of target).As glass original
The material of material 40, is not particularly limited, and can enumerate the fluorophosphate system glass that (1) at least contains P, O and F as glass ingredient
B is more contained in glass, (2) in glass ingredient2O3、La2O3Boric acid lanthanide glass, (3) more contain in glass ingredient
SiO2、TiO2SiO2-TiO2It is glass, (4) with P2O5As principal component and contain the easy reduction being made of Nb, Ti, Bi and W
The niobium phosphate system optical glass of ingredient.
The forming method of glass raw material 40a is not particularly limited.It can be cited for example that: the glass plate of plate will be shaped to
About in the sheet glass of hexahedral shape, at equal intervals by circle obtained from the cutting of columned glass raw material obtained from cutting
The sheet glass of plate-like is accepted the melten glass flowed down by nozzle using undertaking mold and then is shaped to ellipse of revolution shape and gone forward side by side
Sheet glass obtained from row is cooling etc..
Then, the glass raw material 40a preparatory heat softened is supplied to lower die 11.Later, upper mold 21 is inserted into cylinder
Mould 30.In Fig. 4 (A1), the load that is generated by upper mold 21 is simultaneously not applied to glass raw material 40a, therefore maintains the glass softened
The shape of glass raw material 40a.
Then, the amplification of glass raw material 40a and the contact portion of forming surface 17 is illustrated in Fig. 4 (A2).Such as Fig. 4 (A2)
Shown, forming surface 17 has the bumps (surface roughness more than 10 μm) of appropriateness, investment to the glass former material in forming surface 17
Material 40a is mainly contacted with the protrusion of forming surface 17 before pressing.Therefore, compared with existing smooth forming surface, this embodiment party
In the case where the forming surface 17 of formula, it is possible to reduce the contact area of the glass raw material 40a and forming surface 17 that have softened.
In existing molding die, forming surface is smoother, therefore the glass raw material and forming surface that put into are at face
Contact.Therefore, in the case that the temperature of molding die is low, in the contact portion of glass raw material and forming surface, temperature decline is aobvious
Write, to molding when cannot keep suitable for compression molding glass viscosity, in addition to this, glass raw material be easy with forming surface
The part of contact and discontiguous part generate Temperature Distribution.The rising of this viscosity or Temperature Distribution be compression molding when at
The main reason for a problem that type is bad or the generation of generation, the strain of inside glass of crackle.
In contrast, in the molding die of present embodiment, forming surface 17 has the bumps of appropriateness, thus hot from glass
Mobile mitigation of the raw material 40a to forming surface 17.As a result, glass when can prevent the investment of glass raw material 40a is former
The temperature of material 40a declines (viscosity rising), and the mobility and temperature of glass raw material 40a can be sufficiently maintained until when pressing
Spend uniformity.It therefore, can be to the glass raw material 40a of the mobility and temperature uniformity with appropriateness in compression molding
It is pressed, can be improved formed precision and yields.
In addition, glass in order to prevent is hot sticky, preferably at least one of glass raw material 40a and forming surface 17,27
Coated release agent.As release agent, such as use the powdered release agent of boron nitride, aluminium oxide, silica, magnesia etc..It needs
It is noted that the molding die of present embodiment has the bumps of appropriateness in forming surface 17,27, therefore carrying out formed body
After demoulding, release agent is easy to remain on forming surface 17,27.
Then, as shown in Fig. 4 (B1), make the decline of upper mold 21 to press glass raw material 40a, by glass raw material 40a
Compression molding is to imitate the shape of the forming surface shape of upper and lower mould, to obtain optical element blank 40b.
Glass raw material 40a when compression molding preferably remains 104~106The viscosity of dPas.Especially, according to this reality
The molding die for applying mode reduces the contact area of glass raw material 40a Yu forming surface 17 using the bumps of forming surface 17, because
This can remain suitable for the temperature (viscosity) of compression molding until it will be pressed.It should be noted that compression molding
It carries out in an atmosphere.
In addition, other than the shape with convex surface and concave surface as shown in Fig. 4 (B1), the shape of optical element blank 40b
As long as shape be biconvex shape, the shape with convex surface and plane, the shape with concave surface and plane, bi-concave shape etc. with as mesh
The approximate shape of the shape of target glass optical component is just not particularly limited.
It forms obtained optical element blank 40b to take out from molding die, implements the heat for eliminating strain as needed
It handles (annealing).Molding die 11 according to the present embodiment, the few light of form variations after available annealing
Learn element blank 40b.
By the glass raw material (optical element blank 40b) after pressing glass raw material 40a and forming surface 17
The amplification of contact portion is illustrated in Fig. 4 (B2).As shown in Fig. 4 (B2), make upper mold 21 decline and to glass raw material 40a carry out by
When pressure, glass raw material 40a is chased after from the indent and convex forming surface 17 of tool.As a result, only in the convex of forming surface 17 before pressing
The glass raw material 40a contacted at portion is contacted with recess portion after pressing.
The forming surface 17 of present embodiment has the bumps of appropriateness, therefore compared with existing smooth forming surface, surface
Product is big.Therefore, compared with existing forming surface, in pressing, the contact area of forming surface and glass raw material increases.
As a result, glass raw material is with biggish area and forms face contact compared with existing smooth forming surface,
Therefore the cooling velocity of formed body is accelerated, and shape carries out with being fixed well, and form accuracy improves.
Further, molding die according to the present embodiment can be prevented before pressing using the heat insulation effect of forming surface
Glass raw material generate Temperature Distribution, can further. while keeping the temperature uniformity of glass raw material in pressing
It is quenched.Therefore, be difficult to generate strain in the inside of glass forming body 40b, though to formed body (optical element blank) into
Row annealing shrinks also less, also can reduce form variations.
It, can be anti-in compression molding if so making optical element blank using the molding die of present embodiment
Crack arrest line (so-called cracking/rupture) or extension are bad, and the excellent optical element base of formed precision can be obtained with rate of good quality rate
Material.
It chases after in addition, being had using the optical element blank that the molding die of present embodiment makes from the shape of forming surface 17
Shape.That is, main surface is the face that is formed in the optical element blank of present embodiment, above-mentioned main surface has the bumps of appropriateness.This
The surface roughness (Rz) of the main surface of kind optical element blank is preferably 8 μm or more, is more preferably 10 μm or more, is further excellent
It is selected as 20 μm or more, particularly preferably 22 μm or more, is more preferably 25 μm or more.
When making optical element using this optical element blank, even if from starting just to use the thinner grinding stone of granularity,
The sliding of grinding stone can be prevented by being formed in the appropriate bumps of main surface, good grinding can be carried out.It utilizes
This grinding, the deep that the fine crack that generates will not terrifically feed through to glass in grinding (such as are rested on from table
Play 15 μm or less in face), it is easy to remove fine crack in subsequent handling.
It should be noted that the surface roughness (Rz) of the main surface of the optical element blank of present embodiment is preferred
The upper limit is 50 μm or so.In the case that the surface roughness (Rz) of main surface is excessive, grinding/grinding when making optical element adds
The processing capacity of work and process time have increased tendency.
That is, optical element blank according to the present embodiment, in the grinding and grinding process when making optical element, energy
Processing capacity or process time are enough reduced, can be improved the productivity of optical element.
The manufacturing method > of < optical element
The manufacturing method of the optical element of present embodiment includes following processes:
The mill that the optical element blank of the manufacturing method production of optical element blank by present embodiment is ground
Cut process；With
The grinding process that grinding via the grinding process is ground with optical element blank.
As the optical element obtained by this method, it can be cited for example that spherical lens, non-spherical lens, microspur are saturating
The various lens such as mirror, lens array；Prism, diffraction grating etc..
Hereinafter, being illustrated by taking optical lens as an example to an embodiment of the manufacturing method of optical element.It is specific and
Speech, grinding glass lens blank 40b shown in Fig. 4 is directed at while referring to Fig. 5 and (is only called " lenticular blank " sometimes below.)
Grinding and grinding process be illustrated.It should be noted that the present invention is by any restriction of the following embodiments and the accompanying drawings, at this
In the range of the purpose of invention, change appropriate can be applied to implement.
Grinding process is ground using the grindings such as ciamond grinder grinding stone, by the two sides of glass optical component blank 40b
For the technique of defined radius of curvature.In addition, grinding process is to use abrasive disk, using free abrasive grains such as cerium oxide as grinding agent
And to the technique that the two sides for the optical element blank for carrying out grinding is ground.
In step S10 shown in Fig. 5, (CG adds the spherical grinding process of the main surface of progress lenticular blank 40b first
Work).As the curve generator (curve generator) processed for CG, it is not particularly limited, uses ciamond grinder etc.
Well known curve generator.In CG processing, carried out with surface of tens of μm~hundreds of μm of the processing capacity to lenticular blank thick
Grinding is ground two sides in the way of the curvature close to final lens shape.In addition, CG processing for example using
The partial size for the abrasive grain being made of diamond particles is the grinding stone of 20~60 μm (being expressed as #800~#400 with granularity), is ground in supply
It is ground while cutting liquid.It should be noted that the numerical value that the smaller then granularity of the partial size of abrasive grain indicates is bigger.
In general, having regenerated nothing on the surface of optical element blank after processing in the grindings processing such as CG processing
Several fine cracks.The big grinding stone of the partial size of abrasive grain, this fine crack then more have the deep for being easy to involve glass
Tendency, extremely deep crackle are difficult to remove in subsequent handling (fine ginding etc.).In contrast, lesser using the partial size of abrasive grain
In the case where grinding stone, because the fine crack that grinding generates will not deepen terrifically (such as rest on from surface 15 μm with
Under), it is easy to remove fine crack in subsequent handling.
Therefore, from the viewpoint of reduction processing capacity or process time, it is expected that the lesser mill of the partial size that can use abrasive grain
Stone starts CG processing.But in the case where being processed using the small grinding stone of partial size, machined surface is more smooth, and grinding stone is easier
Sliding has the tendency that can not carry out good processing.Therefore, the optical element base of existing smooth forming surface production is utilized
In the case where material, it is difficult to which CG is processed since the small grinding stone of partial size, therefore generally carries out a table using the big grinding stone of partial size
After the processing of face, concave-convex machined surface is formd to appropriateness using the small grinding stone of partial size and is processed.
But using the grinding optical element blank of present embodiment, the face that is formed has had appropriate bumps, because
It even if this is the lesser grinding stone of partial size, can also start CG processing, grinding in subsequent handling and attrition process can be reduced
Processing capacity and process time.
In following step S11, the smooth processing (SM processing) based on fine grinding is carried out.SM processing can be
The processing in one stage is but it is also possible to be multistage processing.As grinding stone used in SM processing, metal adhesive can be used together
Grinding stone and resinoid bond grinding stone or resinoid bond grinding stone can be used only.It should be noted that in present embodiment
In, in these SM processing, the grinding stone of metal adhesive is not preferably used, and added using only resinoid bond grinding stone
Work.In addition, resinoid bond grinding stone is 8~20 μm (being expressed as #2500~#1200 with granularity) it is preferable to use the partial size of abrasive grain
Grinding stone.
Then, in step s 12, attrition process is carried out.In grinding process, grinding comprising 5 μm of partial sizes below is used
The lapping liquid of mill abrasive grain (such as free abrasive grain of acidification cerium) grinds surface, grinds several μm~ten several μm.It is ground by this
Grinder sequence forms the optical lens face of optical lens main body.
Finally, carrying out centering process using step S13, but it also can be omitted centering process according to different situations.Centering work
In sequence, such as carry out following processing: clamping optical lens main body with a pair of of Lens holder and feel relieved, make lens body around
While its center line rotates, the lateral circle surface of lens body is ground to circular with ciamond grinder etc..
Such available biconvex lens, biconcave lens, plano-convex lens, plano-concave lens, positive meniscus lens, falcate are recessed
The various optical lenses such as lens.
In addition, according to purpose is used antireflection film, total reflection film can be coated in the optical function face of obtained lens
Deng.
In the manufacturing method of the optical lens of this present embodiment, the optical element base of present embodiment has been used
Material, therefore the processing capacity that can substantially reduce in above-mentioned grinding process and grinding process and process time, can be improved productivity.
It should be noted that the present invention is not limited by above-mentioned embodiment, can carry out within the scope of the invention each
Kind changes.
For example, showing and only being formed in the forming surface of lower die and upper mold in the molding die of above-mentioned present embodiment
The concave-convex example of appropriateness, for cylinder mould, can also form appropriate bumps but as long as can be successfully pressed and molded.
In addition, in Fig. 1 of above-mentioned embodiment, to be with the molding die of glass lens blank for making grinding
Example is illustrated, but the present invention is not limited to this molding dies.That is, molding die of the invention is suitable as various
Type optical element blank production used in molding die.
[embodiment]
1. molding die'sPrepare
< molding die I >
As the substrate of molding die, prepare the upper die and lower die and cylinder mould of stainless steel.
The substrate surface of upper die and lower die is not processed and directly as forming surface.In the obtained molding die I,
The surface roughness (Rz) of forming surface is 2 μm.It should be noted that the measurement of the surface roughness (Rz) of forming surface uses
Mitutoyo society contour outline measuring set (form tracer) CS3000, it is carried out based on JIS standard B0601.It is same below.
< molding die II >
Firstly, using silica as principal component, will be added and make in coating material of the colloidal silicon dioxide as binder
It for the water of solvent, is sufficiently stirred, obtains the coating solution of desired viscosity.
Then, as the substrate of molding die, prepare the upper die and lower die and cylinder mould of stainless steel.
The coating solution of viscosity for being pre-adjusted as appropriateness is filled to air-brush (air brush), in upper die and lower die
The entire surface in the face corresponding to forming surface in surface equably sprays coating solution atomization.
After making the face for being coated with coating solution dry at normal temperature, 2 sprayings repeatedly.Later, coating material will be formd
Molding die is put into heating furnace, is fired 1 hour under air atmosphere in 150 DEG C.
In the obtained molding die II, the surface roughness (Rz) of forming surface is 11 μm.
< molding die III >
For molding die III, improves the concentration of coating solution and the surface roughness (Rz) of forming surface is made to be 25 μ
In addition to this m is made using method same as molding die II.
< molding die IV >
For molding die IV, further increases the concentration of coating solution and make the surface roughness (Rz) of forming surface
It is 40 μm, in addition to this, utilizes method system same as molding die II.
< molding die V >
As the substrate of molding die, prepare the upper die and lower die and cylinder mould of stainless steel.
The forming surface of upper die and lower die is processed using sandblasting (sand blast).
In the obtained molding die V, the surface roughness (Rz) of forming surface is 21 μm.
2. the production of lenticular blank
Then, lenticular blank has been made using above-mentioned molding die I~V.In the case where using any molding die, press
It is carried out according to the production order of following lenticular blanks.
< lenticular blank A >
Firstly, preparing fluorophosphate system glass raw material (ellipse of revolution shape, quality 16g, Tg=404 DEG C, Ts=444
℃).Then, in the release agent (boron nitride) of the surface coated powder shape of glass raw material.In addition, in the soft of reheating device
Change pallet also coated release agent.
The glass raw material for being coated with release agent is supplied to pallet, investment is set as in 450~700 DEG C of heating furnace,
It is reheated under air atmosphere.Optical glass for mold press molding raw material softening after reheating is about 105DPas's
Viscosity.
Then, by reheating, the glass raw material softened is molded using molding die under air atmosphere
Molding, has made the lenticular blank A of single side convex, diameter 40mm, height 5mm.It should be noted that in the molding of molding die
Face has been pre-coated with release agent, and molding die is heated in advance in the way of for the neighbouring temperature of slackened point (Ts).
3. evaluating (1)
About molding die I~V, the evaluation of molding die has been carried out.Specifically, being made respectively using the above method
The lenticular blank of certain amount (sum of the blank of production is shown in table 1), to the incidence of the defective products of obtained lenticular blank
It is evaluated.Especially, about the incidence of defective products, the detailed content of defective products is had rated.Further, gained is determined
The surface roughness (Rz) of the main surface of the lenticular blank arrived.As a result shown in table 1.
It should be noted that the surface roughness (Rz) of lenticular blank shown in table 1, which is shown, uses each molding die system
The range of surface roughness (Rz) when making the lenticular blank of specified quantity.It should be noted that obtained lenticular blank
The measurement of surface roughness (Rz) at main surface is marked using Mitutoyo society contour outline measuring set CS3000, based on JIS
Quasi- B0601 is carried out.
[table 1]
As shown in table 1, in the case where using the molding die I for being equivalent to comparative example of the invention, in obtained lens blank
Bad or cracking rupture of extending largely is generated in material, produces 16% defective products.
In contrast, in the case where using molding die II~V of the invention, in obtained lenticular blank, by extending
The generation of defective products caused by bad or cracking ruptures is few, and bad product rate is 1.3% or less.
4. evaluating (2)
Then, about lenticular blank obtained from molding die I, molding die II and molding die III is used, tortoise is carried out
Split the evaluation of the relationship of the temperature of rupture and molding die.
Specifically, the temperature control when heating of molding die is closely carried out, by the temperature of respective molding die
It is adjusted to defined temperature (380~440 DEG C) shown in table 2, in addition to this, has been made in the same manner as above-mentioned production order thoroughly
Mirror blank A.Further, lenticular blank B has been made using following conditions.
< lenticular blank B >
Firstly, preparing boric acid group of the lanthanides glass raw material (ellipse of revolution shape, quality 21g, Tg=655 DEG C, Ts=690
℃).Then, in the release agent (boron nitride) of the surface coated powder shape of glass raw material.In addition, in the soft of reheating device
Change pallet also coated release agent.
The glass raw material for being coated with release agent is supplied to pallet, investment is set as in 700~900 DEG C of heating furnace,
It is reheated under air atmosphere.Optical glass for mold press molding raw material softening after reheating is about 105DPas's
Viscosity.
Then, by reheating, the glass raw material softened is molded using molding die under air atmosphere
Molding, has made the lenticular blank B of single side convex, diameter 30mm, height 4mm.It should be noted that in the molding of molding die
Face has been pre-coated with release agent, and molding die is heated in advance in the way of for the temperature of table 2 (680~740 DEG C).
In the case where producing cracking rupture in obtained lenticular blank, it is evaluated as forming bad.Evaluation result is shown
In table 2.It should be noted that in table 2, × mean to form it is bad, zero mean that molding is good.
[table 2]
As shown in table 2, in the molding die I for being equivalent to comparative example of the invention, the temperature of molding die is only slightly to low
Warm side is mobile, it is confirmed that having arrived the generation of cracking rupture.
As molding die I, inhibit to need to improve molding die in the undesirable situation of the molding in the region of low temperature side
Temperature, if but molding die temperature it is high, be easy to produce the hot sticky of glass and molding die, and form variations after molding
Become larger.Therefore, it is known that will lead to the decline of productivity and quality using molding die I production lenticular blank.
In contrast, in molding die II and III of the invention, even if confirming the temperature of molding die slightly to low
Warm side movement is also able to carry out good molding.
5. evaluating (3)
Then, about lenticular blank A obtained from molding die I, molding die III is used, the 1st face and the 2nd are had rated
The form error in face.Specifically, using the simple flexometer of ring type (Mitutoyo society Digimatic Indicator ID-
CX and Original Ring Gauge), the Δ H of lenticular blank A is measured, using Δ H as the index of shape evaluation.
As a result it is shown in Fig. 6.
As shown in Fig. 6 (A), in using the lenticular blank A of molding die I production for being equivalent to comparative example of the invention,
There is the deviation of Δ H value in the 1st face and the 2nd face, that is, having confirmed the shape of lenticular blank, there are biggish deviations.
In contrast, using molding die III of the invention, as shown in Fig. 6 (B), in the 1st face of lenticular blank A and the 2nd
In face, Δ H value is summarized in relatively narrow range, has confirmed the raising of form accuracy.
6. evaluating (4)
Then, about lenticular blank A obtained from molding die I, molding die III is used, to the 1st after annealing
The form error in face and the 2nd face is evaluated.Specifically, using the simple flexometer of ring type (ibid), to lenticular blank A's
Δ H is measured, using Δ H as the form error before annealing.Then, the item under Tg-10 DEG C, 120 minutes, air atmosphere
Lenticular blank A is heated under part, is made annealing treatment, Δ H is measured again, as the form error after annealing.As a result
It is shown in Fig. 7.
As shown in Fig. 7 (A), in the lenticular blank A made using the molding die I for being equivalent to comparative example of the invention
In, after annealing, the deviation of Δ H value is also produced in the 1st face and the 2nd face, that is, the shape for having confirmed lenticular blank exists
Relatively large deviation.Further, shape is also confirmed before and after annealing produce deviation.
In contrast, in the lenticular blank A made using molding die III of the invention, as shown in Fig. 7 (B),
After annealing, Δ H value is summarized in relatively narrow range in the 1st face and the 2nd face, that is, has confirmed the raising of form accuracy.Further,
The deviation for having confirmed the shape of annealing front and back is also few.
The explanation of symbol
11 ... lower dies
21 ... upper molds
13,23 ... substrates
13A ... substrate surface
15 ... overlay films (membrane of oxide ceramics)
17,27 ... forming surfaces
30 ... cylinder moulds
The glass raw material that 40a ... has softened
40b ... grinding glass optical component blank
Claims (7)
1. a kind of molding die, which at least has upper die and lower die and for manufacturing grinding glass optical component
Blank, wherein the forming surface of at least one of described upper die and lower die has membrane of oxide ceramics, the surface of the forming surface
Roughness Rz is more than 10 μm, and in the case where having membrane of oxide ceramics, the surface of membrane of oxide ceramics is forming surface.
2. molding die as described in claim 1, wherein the surface roughness Rz of the forming surface is 50 μm or less.
3. molding die as claimed in claim 1 or 2 is used to carry out the glass raw material softened in air atmosphere
Compression molding.
4. molding die as claimed in claim 1 or 2, wherein the average film thickness of the membrane of oxide ceramics is 5 μm or more 80
μm or less.
5. molding die as claimed in claim 1 or 2, wherein the membrane of oxide ceramics includes selected from by silica, oxidation
At least one of aluminium, zirconium oxide, titanium oxide, magnesia and group of calcium oxide composition.
6. the manufacturing method that glass optical component blank is used in a kind of grinding comprising following processes:
Prepare the process of molding die according to any one of claims 1 to 5；With
Mold pressing procedure, wherein after reheating under air atmosphere to the glass raw material being made of optical glass, utilize institute
Molding die is stated to be pressed and molded the glass raw material softened.
7. a kind of manufacturing method of optical element comprising following processes:
The grinding that the grinding manufactured by manufacturing method as claimed in claim 6 is ground with glass optical component blank
Process；With
The grinding process that grinding through the grinding process is ground with glass optical component blank.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2013/083343 WO2015087429A1 (en) | 2013-12-12 | 2013-12-12 | Mold for glass optical element blank for polishing, method for producing glass optical element blank for polishing, and method for producing optical element |
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| Publication Number | Publication Date |
|---|---|
| CN105793201A CN105793201A (en) | 2016-07-20 |
| CN105793201B true CN105793201B (en) | 2019-06-21 |
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| Country | Link |
|---|---|
| JP (1) | JP6423363B2 (en) |
| CN (1) | CN105793201B (en) |
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| US10351459B2 (en) | 2015-08-14 | 2019-07-16 | Corning Incorporated | Molds and methods to control mold surface quality |
| EP3769960B1 (en) * | 2019-07-23 | 2022-11-16 | Schott Ag | Curved glass window for lidar applications |
| JP7422690B2 (en) * | 2021-01-08 | 2024-01-26 | Hoya株式会社 | Glass mold manufacturing method and optical element manufacturing method |
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| CN1290664A (en) * | 1999-06-29 | 2001-04-11 | 保谷株式会社 | Method for preparing moulded glass product and device for producing glass block product |
| CN1405104A (en) * | 1995-07-18 | 2003-03-26 | 松下电器产业株式会社 | Optical element, optical-element formation mould and method thereof |
| CN1762866A (en) * | 2004-10-20 | 2006-04-26 | 亚洲光学股份有限公司 | Optical lens forming die |
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| JPH03242335A (en) * | 1990-02-16 | 1991-10-29 | Olympus Optical Co Ltd | Member for molding optical element |
| JPH11171555A (en) * | 1997-12-04 | 1999-06-29 | Canon Inc | Production of blank for forming optical element |
| JP2000281362A (en) * | 1999-03-31 | 2000-10-10 | Hoya Corp | Production of sheet-like glass and forming die for sheet- like glass |
| JP3673670B2 (en) * | 1999-04-13 | 2005-07-20 | キヤノン株式会社 | Optical element and method for producing molded glass block for its production |
| WO2009122948A1 (en) * | 2008-04-03 | 2009-10-08 | コニカミノルタオプト株式会社 | Lower die, production method of lower die, method for producing glass gob, and method for producing glass molded body |
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- 2013-12-12 CN CN201380081402.2A patent/CN105793201B/en active Active
- 2013-12-12 WO PCT/JP2013/083343 patent/WO2015087429A1/en active Application Filing
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| CN1405104A (en) * | 1995-07-18 | 2003-03-26 | 松下电器产业株式会社 | Optical element, optical-element formation mould and method thereof |
| CN1290664A (en) * | 1999-06-29 | 2001-04-11 | 保谷株式会社 | Method for preparing moulded glass product and device for producing glass block product |
| CN1762866A (en) * | 2004-10-20 | 2006-04-26 | 亚洲光学股份有限公司 | Optical lens forming die |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2015087429A1 (en) | 2015-06-18 |
| CN105793201A (en) | 2016-07-20 |
| JP6423363B2 (en) | 2018-11-14 |
| JPWO2015087429A1 (en) | 2017-03-16 |
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