WO2007114172A1 - モールドプレス用ガラス素材、及びガラス光学素子の製造方法 - Google Patents
モールドプレス用ガラス素材、及びガラス光学素子の製造方法 Download PDFInfo
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- WO2007114172A1 WO2007114172A1 PCT/JP2007/056675 JP2007056675W WO2007114172A1 WO 2007114172 A1 WO2007114172 A1 WO 2007114172A1 JP 2007056675 W JP2007056675 W JP 2007056675W WO 2007114172 A1 WO2007114172 A1 WO 2007114172A1
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/02—Surface treatment of glass, not in the form of fibres or filaments, by coating with glass
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/062—Glass compositions containing silica with less than 40% silica by weight
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/062—Glass compositions containing silica with less than 40% silica by weight
- C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/062—Glass compositions containing silica with less than 40% silica by weight
- C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
- C03C3/066—Glass compositions containing silica with less than 40% silica by weight containing boron containing zinc
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/062—Glass compositions containing silica with less than 40% silica by weight
- C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
- C03C3/068—Glass compositions containing silica with less than 40% silica by weight containing boron containing rare earths
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
- C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
- C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
- C03C3/093—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium containing zinc or zirconium
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/095—Glass compositions containing silica with 40% to 90% silica, by weight containing rare earths
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/12—Silica-free oxide glass compositions
- C03C3/14—Silica-free oxide glass compositions containing boron
- C03C3/15—Silica-free oxide glass compositions containing boron containing rare earths
- C03C3/155—Silica-free oxide glass compositions containing boron containing rare earths containing zirconium, titanium, tantalum or niobium
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/12—Silica-free oxide glass compositions
- C03C3/16—Silica-free oxide glass compositions containing phosphorus
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/12—Silica-free oxide glass compositions
- C03C3/16—Silica-free oxide glass compositions containing phosphorus
- C03C3/17—Silica-free oxide glass compositions containing phosphorus containing aluminium or beryllium
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/12—Silica-free oxide glass compositions
- C03C3/16—Silica-free oxide glass compositions containing phosphorus
- C03C3/19—Silica-free oxide glass compositions containing phosphorus containing boron
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/12—Silica-free oxide glass compositions
- C03C3/16—Silica-free oxide glass compositions containing phosphorus
- C03C3/21—Silica-free oxide glass compositions containing phosphorus containing titanium, zirconium, vanadium, tungsten or molybdenum
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/12—Silica-free oxide glass compositions
- C03C3/23—Silica-free oxide glass compositions containing halogen and at least one oxide, e.g. oxide of boron
- C03C3/247—Silica-free oxide glass compositions containing halogen and at least one oxide, e.g. oxide of boron containing fluorine and phosphorus
Definitions
- the present invention relates to a glass material used for obtaining an optical element by a precision mold press, and a method for producing an optical element using the same.
- the present invention relates to a glass material for mold presses that can stably produce an optical element having a high degree of wear and easily scratched glass material without impairing optical performance, and the production of an optical element using this glass material.
- the method Regarding the method.
- the optical functional surface formed by press molding has the desired optical performance without machining such as polishing.
- an optical functional surface (mostly an aspheric surface) of a molded body obtained by press molding is used without further machining.
- the outer peripheral portion of the molded body is often subjected to a force elimination calorie with the optical device to be attached. For example, it is usually performed by polishing the outer peripheral surface to define the outer periphery and aligning the outer periphery center with the optical axis.
- the first surface of the molded body and / or the vicinity of the outer edge of the second surface is often polished to form a flat surface perpendicular to the optical axis. In this way, it is possible to accurately position the lens and the optical device on which it is installed.
- low refractive and low dispersion optical glass is extremely useful as a material for a lens constituting an optical system such as an imaging device.
- an optical glass having a refractive index value nd (l) of 1.40-1.60 and an Abbe number (Vd) force of 7 or more is effective in removing chromatic aberration such as a zoom lens.
- the inventors of the present invention have a glass having such an optical constant.
- a fluorophosphate glass having a new composition was developed.
- This fluoric acid glass is a high value-added glass capable of achieving the above optical properties. Further, this fluorophosphate glass was examined as a glass optical element by a precision mold press.
- the optical glass having the above optical constant can obtain an optical element with high accuracy by press molding with relatively good releasability.
- these glasses have a high degree of wear and that they are immediately scratched by handling after molding such as machining as described above.
- Optical glasses having a high refractive index (for example, nd is 1.7 or more) and high dispersion (Vd is 35 or less, etc.) are also frequently used for removing chromatic aberration in small-sized imaging devices and the like, and thus there is a great need.
- the present inventors have developed phosphate glass as a high refractive index glass material that can meet these requirements. However, such glass materials also tend to have a high degree of wear. As a result, as with fluoric acid glass, it was newly found that there is a problem that scratches are easily caused by handling after molding such as a mechanical casing.
- scratches are likely to be caused by handling after molding such as machining or the like, with optical glass having a degree of wear of 200 or more.
- scratches on the optical function surface of the lens that is held and pressed are easily scratched by a process called a centering process that polishes the outer periphery of the lens that is held and pressed with a grindstone. ,It has been found.
- Patent Document 1 Japanese Patent Laid-Open No. 08-277125, the entire description of which is specifically incorporated herein by reference
- the Ilia group metal oxide is formed on the surface on which the functional surface of the glass lens molding material is formed.
- a method of forming a coating of objects is described. According to this, it is disclosed that fusion between the molding material and the mold surface is prevented.
- Patent Document 2 Japanese Patent Laid-Open No. 62-226825, the entire description of which is specifically incorporated herein by reference
- a mold having a glass force having a glass transition temperature higher than the press temperature is used.
- a method is described in which an anti-fusing layer is interposed between the molding glass body having a shape that forms the basis of the finished shape of the mold and the molding die, and the glass body is press-molded by the mold in its softened state. Yes.
- Patent Documents 1 and 2 describe forming a film on the surface of the glass material as a means for preventing fusion between the glass material and the mold. However, these are all for the purpose of preventing fusion between the glass material and the mold, and not for the purpose of preventing scratches on the glass press-molded product caused by handling after molding such as machining. .
- the present invention solves the above-described problems, and even with an optical element having a high degree of wear and a glass material strength, the optical function surface is damaged by the contact that the glass press-molded product receives during handling after press molding. It is an object of the present invention to provide a means which does not affect the function of the optical element finally obtained even if a scratch occurs.
- the present invention for solving the above-described problems is as follows.
- Abrasion degree FA force A core part made of optical glass having a power of 3 ⁇ 400 or more (hereinafter referred to as the first glass) and a covering part having a second glass force covering at least a part of the surface of the core part.
- the first glass has a glass material for mold press.
- the phosphate glass is a mole 0/0 Display, PO; 15 ⁇ 45%, Nb O ; 0 ⁇ 35%, Li
- a glass optical element characterized in that a glass material preformed into a predetermined shape is softened by heating, press molding is performed using a molding die, and an outer peripheral portion of the obtained molded body is removed by machining. It is a manufacturing method, Comprising: The said glass material as described in any one of [1]-[8] is used as said glass material, The said manufacturing method characterized by the above-mentioned.
- a precision mold is formed using a glass material that is easily scratched and has a high degree of wear.
- the glass material for a mold press comprises a core part made of optical glass (first glass) having an abrasion degree FA of 200 or more, and a second part covering at least a part of the surface of the core part. And a covering portion that is made of glass.
- FA of optical glass is evaluated by the following method based on JOGIS-1975, Japan Optical Glass Industry Standard.
- a sample with a measurement area of 9 cm 2 is held at a fixed position of 80 mm from the center of a flat plate made of pig iron that rotates horizontally at 60 rpm, and 20 ml of water is added to 10 g of alumina granules with an average particle size of 20 ⁇ m. Supply the wrapping liquid evenly for 5 minutes and wrap under a load of 9.807N. Weigh the sample mass before and after the lap to determine the wear mass W. Similarly, the wear mass W0 of the standard sample (BSC7) specified by the Japan Optical Glass Industry Association is measured, and the wear degree (FA) is calculated by the following equation.
- S is the specific gravity of the sample
- SO is the specific gravity of the standard sample (BSC7).
- the first glass of the present invention is an optical glass having an abrasion degree of 200 or more.
- the effect of the present invention is remarkable when the optical glass has an abrasion degree of 300 or more.
- the preferred degree of wear of the first glass is in the range of 300-500.
- the composition there are no particular restrictions on the composition. However, for example, in the case of fluoric acid glass with FA ⁇ 400 and phosphoric acid glass with FA ⁇ 300, the present invention can be carried out very advantageously.
- fluorophosphate glass examples include the following.
- An optical glass which is a fluoric acid glass and contains the following components in terms of cation%.
- the above-mentioned glass wherein the optical glass contains 2-30% thione Li +.
- the refractive index value nd is in the range of 1.40 to L60, and the Abbe number
- the effect of the present invention is particularly remarkable in a fluoric acid glass having (Vd) of 67 or more.
- Optical glass phosphate glass containing 0-10% and TaO; 0-10%.
- the first glass can be preformed as follows.
- the glass material applicable to the present invention is produced using a first glass preformed into a predetermined volume and shape.
- a block-shaped optical glass force cut out can be preformed into a predetermined volume and a predetermined shape by grinding or polishing (preliminary molding 1).
- the molten glass can be separated by dropping or flowing down the pipe force to form a predetermined amount of glass lump, which can be preformed during cooling of the glass lump (preliminary forming 11).
- the molten glass is received by a receiving mold that ejects gas from the bottom, and substantially A method of preforming while cooling in the floated state can be used. This method is preferable because a glass material having a smooth surface with high production efficiency can be obtained.
- the method II includes the case where the shape or volume is finely adjusted by further machining such as polishing after preforming during cooling of the glass lump as described above, and this method is also included in the present invention. It is preferably applied.
- a glass material for mold press is obtained by coating the second glass with the glass lump of the first glass preformed as described above.
- the covering portion may be removed from the molded body or may be left as it is without being removed.
- a second glass having a lower degree of wear than the first glass and coat the surface of the first glass.
- the abrasion degree of the second glass is preferably less than 200, more preferably 150 or less.
- the composition is not particularly limited.
- the lower limit of the degree of wear of the second glass is, for example, 30 and preferably 50.
- Tables 3 and 4 show specific examples of the second glass having an abrasion degree of less than 200.
- Tg-TMA Glass transition temperature
- Ts Sag point " ⁇ 100-300”: Linear expansion coefficient in high temperature range (100-300 ° C)
- Etching rate is 50 ° C 0.1N nitric acid (HNO) for 10 to 25 minutes
- the average weight loss rate per minute (wt% / min).
- the second glass having a molded product surface force can be removed after press molding.
- the removal of the second glass can be performed by etching.
- the second glass can be removed by etching using acid or alkali.
- the weight reduction rate of the second glass by the prescribed acid or alkali treatment should be 10 or more of the weight reduction rate of the first glass. Is preferred.
- nitric acid, hydrochloric acid, sulfuric acid, acetic acid, phosphoric acid, sodium hydroxide hydroxide, potassium hydroxide aqueous solution, etc. are each diluted appropriately to a concentration of 0.1N to 0.0001N. It can be used as an aqueous solution, or a commercially available mixed acid, mixed alkali, or cleaning solution can be used in accordance with the purpose. At this time, it is desirable to adjust the concentration so that the first glass is not etched.
- nitric acid, hydrochloric acid, sodium hydroxide and the like which do not precipitate salts due to reaction with glass components, are desirable.
- a buffer solution, a chelating material, and the like can be added together with the etching solution to the extent that the purpose of the present invention is not impaired.
- the coating portion of the second glass can be selected in consideration of the process and handling that the molded body undergoes after press molding. For example, in the centering step, when the molded body is chucked by the opposing bell member, if one (for example, the fixed shaft side) damages the molded body more than the other (for example, the movable shaft side), It is also possible to provide a coating on only that surface. Preferably, the covering portion can be covered so as to wrap the entire core portion having the first glass force.
- the second glass is coated on the preform that has been preformed as described above and that also has the first glass power.
- a coating method a known film formation method such as sputtering or vacuum vapor deposition may be used. it can.
- a coating layer made of the second glass can be formed by sputtering using the second glass as a target and using argon gas, which is preferable.
- the film thickness range is preferably 0.1 to 1000 nm, more preferably 0.1 to 500 nm, and still more preferably 2 to 100 nm.
- the covering portion is preferably covered so as to wrap the entire core portion, but may be a partial covering as long as at least a region that is an effective diameter of the obtained optical element is covered.
- the glass material of the present invention preferably has a film containing carbon on its surface (that is, further outside of the covering portion). This provides sufficient slipperiness with the mold when the glass material is supplied to the mold prior to pressing, allowing the glass material to move smoothly to a predetermined position (center position) of the mold, When the glass material is softened and deformed by pressing, it stretches according to the glass deformation on the surface of the glass material, and helps to spread the glass material on the mold surface. Furthermore, when the molded body is cooled to a predetermined temperature after pressing, it is useful in that the glass is easily separated from the surface of the mold and helps to release the mold.
- the carbon-containing film may contain a component other than carbon, such as a hydrocarbon film that is preferably a film containing carbon as a main component.
- a film forming method a known film forming method such as vacuum vapor deposition using a carbon raw material, sputtering, ion plating method, plasma treatment, ion gun treatment or the like can be used.
- the film may be formed by pyrolysis of a carbon-containing material such as hydrocarbon.
- a hydrocarbon gas is introduced into and contacted with a reactor containing a glass lump provided with a coating, and a carbon-based film is formed on the surface of the glass material by thermal decomposition of the hydrocarbons.
- the hydrocarbon used is acetylene, ethylene, butane, ethane, propylene, propane, benzene or the like, and acetylene is preferred because of its relatively low thermal decomposition temperature.
- the temperature in the reactor is raised to the thermal decomposition temperature.
- the temperature range is a temperature suitable for hydrocarbon pyrolysis, usually in the range of 250 ° C to 600 ° C.
- the temperature is 400 to 550 ° C, preferably 480 ° C to 510 ° C.
- the film thickness should be 1-20 nm, preferably 1-10 nm, more preferably 2-5 nm. Is preferred.
- the present invention includes a method for producing a glass optical element by softening a glass material having a predetermined shape by heating and performing press molding using a mold. Manufacture of this glass optical element The glass material of the present invention is used.
- the press molding method will be described.
- a mold used for press molding a precision material made of a dense material having sufficient heat resistance and rigidity can be used.
- a precision material made of a dense material having sufficient heat resistance and rigidity
- membrane can be mentioned.
- the film covering the molding surface is preferably a film containing carbon.
- a film composed of a single component layer or a mixed layer of amorphous and Z or crystalline, graphite and Z or diamond is preferably used.
- This carbon film can be formed by means of a sputtering method, a plasma CVD method, a CVD method, an ion plating method or the like.
- a film can be formed by sputtering using an inert gas such as Ar as a sputtering gas and a graphite as a sputtering target.
- the film may be formed using microwave gas CVD method using methane gas and hydrogen gas as source gases. When forming by ion plating, it can be ionized using benzene gas.
- These carbon films include those having C—H bonds.
- Press molding can be performed, for example, by the following method.
- the mold including the upper mold, lower mold, and body mold
- the glass material are heated to a temperature range suitable for press.
- a temperature range suitable for press it is preferable to perform press molding when the glass material and the mold are in a temperature range in which the viscosity of the glass material is S 10 5 to 10 1Q dPa's.
- the glass material may be introduced into the mold, and both the glass material and the mold may be heated to the above temperature range, or the glass material and the mold may be heated to the above temperature range, and then the glass material may be formed. It may be placed in a mold.
- the carbon-containing film can be removed from the surface of the molded body obtained by press molding. Alternatively, if necessary, the molded body can be annealed to remove strain and / or adjust the refractive index. At this time, the carbon-containing film can be removed by heating in an oxidizing atmosphere.
- machining such as a centering step is performed after removing the carbon-containing film from the press-molded product or without removing the carbon-containing film.
- centering is performed so that the optical axis of the lens coincides with the rotation axis of the lens for centering, and then the optical axis of the lens is fixed to the rotation axis and rotated around the axis, so that the outer circumference of the lens A grindstone is brought into contact with.
- the lens is bell-chucked by the opposing bell portions, and the lens is held and pressed between the bell portions. That is, when the lens is held and pressed, centering is performed by utilizing the fact that the optical functional surface slides with the bell surface.
- the surface strength of the molded body can also remove the covering portion of the present invention.
- the removal method may be physical removal or chemical removal.
- As the physical removal a method using a polishing cloth can be applied, and as the chemical removal method, etching can be used.
- etching can be used.
- the etching step can be performed in the order of etching ⁇ rinsing ⁇ drying, for example.
- a press-molded product after machining such as the centering process is set on a jig or the like, immersed in a container containing an etching solution for a predetermined time (for example, 10 to 300 seconds), the covering portion is removed, and water is then removed.
- the molded product surface force etching solution is removed by dipping in a container containing, and water on the molded product surface is removed with a drier to obtain a dried molded product.
- the cleanliness of the surface of the molded body can be increased by a cleaning process, but from the viewpoint of increasing the cleanliness of the surface of the molded body, a lens cleaning process is performed before the drying process. It is desirable.
- a lens cleaning process is performed before the drying process. It is desirable.
- a force that is appropriately diluted and used as a 0.0001N 1N aqueous solution, or a commercially available mixed acid, mixed alkali, or washing solution can be used according to the purpose.
- the etching step is performed after the annealing and / or centering step is performed on the press-formed product.
- An optical functional film can be provided on the surface of the molded body thus obtained.
- the optical functional film include an antireflection film.
- this covering portion can be used as the optical functional film of the optical element or a part thereof.
- a desired antireflection film can be obtained by appropriately forming a known material in a single layer or by laminating on a molded body having a covering portion.
- optical element of the present invention include small-diameter and thin-weight lenses such as small imaging lenses, communication lenses, objective lenses for optical pickups, collimator lenses, and the like that are mounted on portable imaging devices and the like. can do. However, it is not the intention limited to these.
- small-diameter and thin-weight lenses such as small imaging lenses, communication lenses, objective lenses for optical pickups, collimator lenses, and the like that are mounted on portable imaging devices and the like. can do. However, it is not the intention limited to these.
- optical glass A was dropped onto a molten state force receiving mold and cooled to preform a glass block having a biconvex curved shape with a flat spherical shape.
- glass B which is the multi-component glass of Example 26 shown in Table 3, as a target, a coating portion with a thickness of 15 is formed on the surface of the preformed glass block by sputtering. did.
- a hydrocarbon in this case using acetylene gas
- acetylene gas is introduced and brought into contact with it to thermally decompose to form a carbon-based film on the surface of the glass material.
- a glass material was used, and press molding was performed. That is, made of SiC A mold composed of an upper and lower mold and a body mold, and a mold having a carbon-containing release film formed by sputtering on the molding surface of the upper and lower molds, is heated to a temperature equivalent to l ( 5 dPa ' S) by the viscosity of glass A.
- a glass material heated to a temperature at which the viscosity of glass A becomes 10 7 ' 2 dPa's was supplied, with airflow being jetted onto the separable mold. The glass material was held, and the glass material was softened by heating, and then the mold was divided and dropped onto the lower mold.
- the glass material is pressed between the upper and lower molds, and the glass and the upper and lower molds are maintained in close contact with each other, cooled to a temperature lower than the annealing temperature of glass A, and the molded product is taken out from the mold. . 100 continuous moldings were performed by the press molding.
- the obtained molded body was held in a heating furnace for 2 hours, and then the temperature was lowered at -50 ° C / h, followed by sealing.
- the annealed molded body was centered by a centering machine, the outer periphery of the molded body was removed, and the center of the outer diameter was matched with the optical axis.
- the molded product after centering was evaluated with a magnifying glass, about 10% of the molded products were observed to have ring-shaped scratches at the site where the bell was chucked by the bell part of the centering machine.
- etching for removing the coating on the surface of the molded body was performed. Specifically, it was immersed in a 50 ° C. 0.1 HNO aqueous solution for 300 seconds, pulled up, washed with pure water, and dried.
- Example 1 For the purpose of comparison, a sample was produced in which only the carbon-containing film was formed on the surface of the glass lump having optical glass A force preformed in Example 1 without providing a coating portion.
- This comparative sample was subjected to the same continuous press as described above, and after the press-molded product was annealed, it was centered by a centering machine in the same manner as in the above example, and the outer periphery of the molded product was removed.
- the molded product after centering was evaluated with a magnifying glass, about 85% of the molded products had ring-shaped scratches on the optical function surface. And after washing these moldings, an antireflection film was formed on the surface to obtain a glass lens.
- optical glass C was dropped onto a molten state force receiving mold and cooled to preform a biconvex curved glass lump having a flat spherical shape.
- the obtained molded body was held in a heating furnace for 2 hours, and then cooled to -50 ° C / h and sealed.
- etching was performed to remove the coating on the surface of the molded body. Specifically, it was immersed in a 50 ° C. 0.1 HNO aqueous solution for 300 seconds, pulled up, washed with pure water, and dried.
- Example 2 For the purpose of comparison, a sample was produced in which only the carbon-containing film was formed on the surface of the glass lump having the optical glass C force preformed in Example 2 without providing a coating portion.
- This comparative sample was subjected to the same continuous press as described above, and after the press-molded product was annealed, it was centered by a centering machine in the same manner as in the above example, and the outer periphery of the molded product was removed.
- the molded product after centering was evaluated with a magnifying glass, it was found that there was a molded product with ring-shaped scratches on the optical function surface. There was 80%. After these molded products were washed, an antireflection film was formed on the surface, resulting in an appearance defect of about 80% as a glass lens.
- the present invention can be used in the field of manufacturing glass optical elements such as glass lenses.
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Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US12/295,620 US8206830B2 (en) | 2006-03-31 | 2007-03-28 | Glass material for mold pressing and method for manufacturing optical glass element |
Applications Claiming Priority (2)
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JP2006100833A JP5160043B2 (ja) | 2006-03-31 | 2006-03-31 | モールドプレス用ガラス素材、及びガラス光学素子の製造方法 |
JP2006-100833 | 2006-03-31 |
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PCT/JP2007/056675 WO2007114172A1 (ja) | 2006-03-31 | 2007-03-28 | モールドプレス用ガラス素材、及びガラス光学素子の製造方法 |
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US (1) | US8206830B2 (ja) |
JP (1) | JP5160043B2 (ja) |
CN (1) | CN101437766A (ja) |
WO (1) | WO2007114172A1 (ja) |
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US8633121B2 (en) | 2009-08-26 | 2014-01-21 | Hoya Corporation | Fluorophosphate glass, glass material for press molding, optical element blank, optical element, processes for production of same, and process for production of glass moldings |
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US7989377B2 (en) | 2006-12-05 | 2011-08-02 | Hoya Corporation | Optical glass and optical element |
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Also Published As
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US20090314033A1 (en) | 2009-12-24 |
US8206830B2 (en) | 2012-06-26 |
JP2007269614A (ja) | 2007-10-18 |
JP5160043B2 (ja) | 2013-03-13 |
CN101437766A (zh) | 2009-05-20 |
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