CN113620568B - Precision compression molding method for glass lens in mining equipment - Google Patents
Precision compression molding method for glass lens in mining equipment Download PDFInfo
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- CN113620568B CN113620568B CN202111049066.6A CN202111049066A CN113620568B CN 113620568 B CN113620568 B CN 113620568B CN 202111049066 A CN202111049066 A CN 202111049066A CN 113620568 B CN113620568 B CN 113620568B
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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
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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
- C03B11/12—Cooling, heating, or insulating the plunger, the mould, or the glass-pressing machine; cooling or heating of the glass in the mould
- C03B11/122—Heating
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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
- C03B11/12—Cooling, heating, or insulating the plunger, the mould, or the glass-pressing machine; cooling or heating of the glass in the mould
- C03B11/125—Cooling
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2215/00—Press-moulding glass
- C03B2215/40—Product characteristics
- C03B2215/46—Lenses, e.g. bi-convex
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2215/00—Press-moulding glass
- C03B2215/50—Structural details of the press-mould assembly
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
Abstract
The invention provides a precision compression molding method for glass lenses in mining equipment. The method is based on a precise compression molding device of the glass lens, and the glass lens in the mining equipment is processed and manufactured according to related procedures; the precise compression molding method of the glass lens comprises the following steps: placing the glass preform in a forming device, directly carrying out arc heating on the glass preform by using electric arcs generated by upper and lower annular electrodes to heat the glass preform to a certain temperature, applying pressure to the glass preform by using a pressurizing device and maintaining the pressure for a certain time, then heating the glass preform to another temperature and maintaining the pressure for a certain time to carry out stress relief annealing, finally cooling the glass preform by using a cooling device, removing the pressure, opening the mold and taking out the formed glass lens. The method provided by the invention can be used for manufacturing the glass lens with high molding quality and high molding precision.
Description
Technical Field
The invention relates to the technical field of compression molding, in particular to a precise compression molding method for a glass lens.
Background
Along with popularization of intelligent mine construction, laser three-dimensional scanners, infrared laser rangefinders, infrared thermal imagers and various unmanned intelligent detection systems are widely applied to mine construction, and optical glass lenses play a very key role in the devices, and the imaging quality and the system identification capability of the devices are directly determined by the molding precision and the optical performance of the lenses. The method for molding the optical lens at the present stage mainly comprises the steps of compression molding, namely heating, pressurizing, annealing and cooling.
The heating method of the existing optical element lens compression molding equipment generally adopts a die direct heating method and an infrared heating method. The method has the advantages that the time required for heating and radiating is long, and complex elements are heated unevenly in the mould; the infrared heating device is complex in structure, large in size and needs to be fixed, the processing adaptability to optical elements with different sizes is poor, the energy utilization rate is low, the optical elements are heated unevenly, meanwhile, an infrared heating lamp is easy to damage, and the whole service life of the device is short.
In view of the above drawbacks, some students tried to heat the optical element preform by using a microwave heating method, and the invention patent with application number CN201611192680.7 discloses a microwave heating precision compression molding device for glass lens production, which uses a microwave magnetron to generate microwaves, and irradiates the microwaves to a sleeve, and the outer wall of the sleeve is coated with a wave-absorbing heating coating to convert the microwave energy into heat to heat the glass blank, but the heating method still has the following disadvantages: (1) Although the heat transfer efficiency is improved, the condition that the optical element preform is heated unevenly still occurs; (2) The new compression molding apparatus is relatively complex in structure, costly and inconvenient to maintain.
In view of the foregoing, there is a need for an improved precision press molding method for glass lenses to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a precision compression molding method for glass lenses in mining equipment, which directly heats glass preforms by using electric arcs generated by upper and lower annular electrodes, so that the heat transfer distance is shortened, the heating time is shortened, the glass preforms can be heated more uniformly, and the glass lenses with higher molding quality and molding precision can be manufactured.
In order to achieve the aim, the invention provides a precision compression molding method for glass lenses in mining equipment, which is used for a precision compression molding device for glass lenses; the precise compression molding device for the glass lens comprises a frame, a molding device for molding a glass preform, a heating device for heating the glass preform, a pressurizing device for applying pressure to the glass preform and a cooling device for cooling the glass preform; the forming device comprises an upper die and a lower die;
the heating device comprises an upper annular electrode, a lower annular electrode, a vacuum cover sleeved on the peripheries of the upper annular electrode and the lower annular electrode, an upper sealing ring arranged above the vacuum cover and a lower sealing ring arranged below the vacuum cover;
the pressurizing device comprises an oil cylinder, a hydraulic pump and an electromagnetic valve which are arranged on the oil cylinder, a hydraulic cylinder arranged on the rack, a piston rod arranged above the hydraulic cylinder, a transmission block arranged above the piston rod and a pressure sensor arranged on the piston rod;
the cooling device comprises an upper cooling water block and a lower cooling water block;
the precision compression molding method of the glass lens in the mining equipment comprises the following steps:
s1, installing the forming device, the heating device, the pressurizing device and the cooling device; placing the glass preform on the lower mold; extracting air in the vacuum cover and filling inert gas;
s2, switching on power supplies of the upper annular electrode and the lower annular electrode, and heating the glass preform by using generated electric arcs from room temperature T0 to T1;
s3, maintaining the lower die at a set temperature, and applying pressure P1 to the lower die by using the hydraulic pump, wherein the dwell time is t1;
s4, maintaining the glass preform at a temperature T2, and applying pressure P2 to the lower die by using the hydraulic pump, wherein the dwell time is T2, and performing stress relief annealing;
s5, cooling water is introduced into the upper cooling water block and the lower cooling water block, the electromagnetic valve is opened to discharge the pressure provided by the pressurizing device, the upper die is separated from the lower die, and the formed glass lens is taken out.
As a further improvement of the present invention, in step S2, the upper ring electrode is connected to the positive electrode of the power supply through a wire and is positively charged; the lower annular electrode is connected with the negative electrode of the power supply through a lead and is negatively charged; when the power is turned on, an arc can be formed between the upper ring electrode and the lower ring electrode.
As a further development of the invention, in step S2, the T1 temperature is equal to the yield temperature at±10 ℃ of the glass material.
As a further improvement of the invention, in the step S3, the value range of the pressure P1 is 0.05-5MPa.
As a further improvement of the invention, in the step S3, the value range of the heat preservation time t1 is 20-100S.
As a further improvement of the present invention, in step S4, the value of the T2 temperature ranges from 218 to 222 ℃.
As a further improvement of the present invention, in step S4, the value of the pressure P2 ranges from 0.02 MPa to 2MPa.
As a further improvement of the invention, in the step S4, the value range of the heat preservation time t2 is 10-100S.
As a further improvement of the present invention, the upper ring electrode is connected with an upper die; the lower annular electrode is connected with the lower die; the upper annular electrode, the upper die, the lower annular electrode and the lower die are all positioned in the vacuum cover; inert gas can be introduced into the vacuum cover to serve as protective gas; a temperature sensor is arranged in the vacuum cover.
As a further improvement of the invention, the upper cooling water block and the lower cooling water block are externally connected with water pipes.
The beneficial effects of the invention are as follows:
(1) According to the precision compression molding method for the glass lens in the mining equipment, disclosed by the invention, the glass preform is directly heated by using the electric arcs generated by the upper annular electrode and the lower annular electrode, so that the heat transfer distance is shortened, and the heat conversion efficiency and the heat transfer efficiency in the heating process are greatly improved; meanwhile, due to the reduction of heating time, the glass preform is heated more uniformly, and the molding quality and molding precision of the molded glass lens are improved.
(2) Compared with the traditional direct heating method, the precise compression molding method for the glass lens in the mining equipment provided by the invention has the advantages that the electric arc heating is adopted without using a heating plate, and the molding device only needs to be additionally provided with a vacuum cover, so that the heating device structure of the whole compression molding equipment is simplified, and the operation is more convenient.
(3) According to the precision compression molding method for the glass lenses in the mining equipment, provided by the invention, the used molding dies have replaceability, and a plurality of dies can be simultaneously arranged, so that different types of glass lenses such as high-precision double-spherical surfaces, double-non-spherical surfaces, single-spherical surfaces and the like can be produced in batches.
(4) The precise compression molding method for the glass lens is safe and reasonable in operation, simple and convenient in operation process, and has higher stability and higher reliability.
Drawings
Fig. 1 is a schematic structural view of a precision press molding apparatus for glass lenses used in the present invention.
Reference numerals
100-a precise compression molding device for glass lenses; 1-a frame; 2-glass preform; 3-upper die; 4-lower die; 5-an upper die holder; 6-an upper die fixing shaft; 7-centering means; 8-an angle adjusting block; 9-a lower die holder; 10-a lower die fixing shaft; 11-upper ring electrode; 12-a lower ring electrode; 13-vacuum hood; 14-an upper sealing ring; 15-a lower sealing ring; 16-an oil cylinder; 17-a hydraulic pump; 18-an electromagnetic valve; 19-a hydraulic cylinder; 20-a piston rod; 21-a transmission block; 22-a pressure sensor; 23-upper cooling water blocks; 24-lower cooling water block.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
It should be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and/or processing steps closely related to aspects of the present invention are shown in the drawings, and other details not greatly related to the present invention are omitted.
In addition, it should be further noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Referring to fig. 1, the present invention provides a precision press molding device for manufacturing a glass lens with high molding quality and high molding precision; the precision press molding device for glass lenses comprises a frame 1, a molding device for molding a glass preform 2, a heating device for heating the glass preform 2, a pressurizing device for applying pressure to the glass preform 2 and a cooling device for cooling the glass preform 2.
Specifically, the forming device comprises an upper die 3, a lower die 4, an upper die holder 5, an upper die fixing shaft 6, a centering device 7, an angle adjusting block 8, a lower die holder 9 and a lower die fixing shaft 10, wherein the upper die 3 and the lower die 4 are arranged up and down oppositely, the upper die holder 5 is arranged above the upper die 3, the upper die fixing shaft 6 is arranged above the upper die holder 5, the centering device 7 and the angle adjusting block 8 are arranged on the upper die fixing shaft 6, and the lower die holder 9 is arranged below the lower die holder 9; the forming device can simultaneously set up a plurality of upper mould 3 and lower mould 4, and upper mould 3 and lower mould 4 can customize according to the structure of required glass lens, so set up, this device can the different grade type glass lens such as the bight of mass production high accuracy, biaspheric, monospherical.
The heating device comprises an upper annular electrode 11, a lower annular electrode 12, a vacuum cover 13 sleeved on the peripheries of the upper annular electrode 11 and the lower annular electrode 12, an upper sealing ring 14 arranged above the vacuum cover 13 and a lower sealing ring 15 arranged below the vacuum cover 13. In the present embodiment, an intermediate plate is provided in the middle of the frame 1, and one end of the vacuum hood 13 is attached to the intermediate plate. The vacuum cover 13 is also internally provided with a temperature sensor which can monitor the temperature inside the vacuum cover 13 in real time so as to know the accurate temperature of the glass preform 2 in the vacuum cover 13. When the glass preform 2 is used, after the air in the vacuum cover 13 is pumped out and filled with inert gas, the power supplies of the upper annular electrode 11 and the lower annular electrode 12 are respectively connected, an electric arc can be generated between the upper annular electrode 11 and the lower annular electrode 12, and the middle of the mold can be heated by the electric arc.
The pressurizing device comprises an oil cylinder 16, a hydraulic pump 17 and an electromagnetic valve 18 which are arranged on the oil cylinder 16, a hydraulic cylinder 19 arranged on the frame 1, a piston rod 20 arranged above the hydraulic cylinder 19, a transmission block 21 connected with the piston rod 20 and a pressure sensor 22 arranged on the piston rod 20; the hydraulic pump 17 and the electromagnetic valve 18 are controlled to drive the piston rod 20 to move up and down in the transmission block 21, and the transmission block 21 can be pushed up by the piston rod 20 until pressure is transmitted to the lower die 4 so as to push the lower die 4 to move up to contact the upper die 3, so that the die closing process is realized; after the pressure provided by the pressurizing device is removed, the lower die 4 can move downwards, so that the die opening process is realized. In particular, the pressure sensor 22 can monitor the pressure provided by the piston rod 20 in real time, and the pressure sensor 22 can feed back a pressure signal to the hydraulic controller, which in turn controls the hydraulic pump 17 to ensure that the pressure borne by the lower die 4 is within a predetermined range.
The cooling device comprises an upper cooling water block 23 arranged above the upper die holder 5 and a lower cooling water block 24 arranged below the lower die holder 9. The upper cooling water block 23 and the lower cooling water block 24 are externally connected with water pipes, and the upper mold base 23 and the lower mold base 24 can be cooled by cooling water through the water pipes in the upper cooling water block 23 and the lower cooling water block 24 so as to realize cooling of the glass preform 2.
Referring to fig. 1, the method for precisely compression molding a glass lens in mining equipment provided by the invention comprises the following steps:
s1, installing a forming device, a heating device, a pressurizing device and a cooling device; placing the glass preform 2 on the lower mold 4; then fixing the upper sealing ring 14 and the lower sealing ring 15 at the upper and lower ends of the vacuum cover 13, and pumping out the air in the vacuum cover 13 and filling inert gas as protective gas after checking the air tightness of the vacuum cover 13;
s2, switching on the power supply of the upper annular electrode 11 and the lower annular electrode 12, forming an electric arc between the positively charged upper annular electrode 11 and the negatively charged lower annular electrode 12, heating the glass preform 2 by using the generated electric arc, and heating the glass preform 2 from room temperature to the yield temperature At+/-10 ℃ of the material;
s3, maintaining the glass preform 2 at a set temperature; then the hydraulic pump 17 is opened, oil in the oil cylinder 16 can be flushed into the hydraulic cylinder 19 through the hydraulic pump 17, the oil can push the piston rod 20 in the transmission block 21 upwards, meanwhile, the piston rod 20 can drive the transmission block 21 to move upwards, and then the lower die fixing shaft 10, the lower die holder 9 and the lower die 4 can be driven to move upwards, and when the lower die 4 contacts the upper die 3, the die closing process is completed; then, the hydraulic pump 17 is controlled to apply pressure of 0.05-5MPa to the lower die 4, and the maintaining time is 20-100s;
s4, maintaining the glass preform 2 at 218-222 ℃ by adjusting arc energy; then the pressure born by the lower die 4 is controlled to be 0.02-2MPa by controlling the hydraulic pump 17, and the duration time is 10-100s; simultaneously, the original inert gas in the vacuum cover 13 is pumped out and new inert gas is filled in at a certain speed; at this time, the glass preform 2 is subjected to stress relief annealing;
s5, cooling water is introduced into the upper cooling water block 23 and the lower cooling water block 24 to cool the upper die holder 5 and the lower die holder 9 respectively, so that the glass preform 2 is cooled; after cooling, the electromagnetic valve 18 is opened, oil in the hydraulic cylinder 19 flows back to the oil cylinder 16 at a certain speed, the piston rod 20 falls down, and the lower die fixing shaft 10, the lower die holder 9 and the lower die 4 are driven to move down, so that the die opening process is realized; after the mold is opened, the molded glass lens can be removed from the lower mold 4.
In summary, according to the precision compression molding method for glass lenses in mining equipment provided by the invention, the glass preform 2 is directly heated by using the electric arcs generated by the upper annular electrode 11 and the lower annular electrode 12, so that the heat transfer distance is shortened, the heating time is shortened, the glass preform 2 can be heated more uniformly, and compared with the traditional method, the glass lenses with higher molding quality and higher molding precision can be manufactured; the method has higher stability and higher reliability, and is suitable for large-area popularization in the field of optical lens molding.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention.
Claims (10)
1. A precision compression molding method of glass lens in mining equipment is used for a precision compression molding device of glass lens; the method is characterized in that: the precise compression molding device for the glass lens comprises a frame (1), a molding device for molding a glass preform (2), a heating device for heating the glass preform (2), a pressurizing device for applying pressure to the glass preform (2) and a cooling device for cooling the glass preform (2); the forming device comprises an upper die (3) and a lower die (4);
the heating device comprises an upper annular electrode (11), a lower annular electrode (12), a vacuum cover (13) sleeved on the peripheries of the upper annular electrode (11) and the lower annular electrode (12), an upper sealing ring (14) arranged above the vacuum cover (13) and a lower sealing ring (15) arranged below the vacuum cover (13);
the pressurizing device comprises an oil cylinder (16), a hydraulic pump (17) and an electromagnetic valve (18) which are arranged on the oil cylinder (16), a hydraulic cylinder (19) arranged on the frame (1), a piston rod (20) arranged above the hydraulic cylinder (19), a transmission block (21) arranged above the piston rod (20) and a pressure sensor (22) arranged on the piston rod (20);
the cooling device comprises an upper cooling water block (23) and a lower cooling water block (24);
the precision compression molding method of the glass lens in the mining equipment comprises the following steps:
s1, installing the forming device, the heating device, the pressurizing device and the cooling device; -placing the glass preform (2) on the lower mould (4); extracting air in the vacuum cover (13) and filling inert gas;
s2, switching on the power supply of the upper annular electrode (11) and the lower annular electrode (12), and heating the glass preform (2) by using the generated arc from the room temperature T 0 Heating to T 1 A temperature;
s3, maintaining the temperature at a set temperature, and using the hydraulic pump (17) to control the temperature of the waterThe lower die (4) applies pressure P 1 Dwell time is t 1 ；
S4, maintaining the glass preform (2) at a temperature T 2 Applying a pressure P to the lower die (4) by using the hydraulic pump (17) 2 Dwell time is t 2 Carrying out stress relief annealing;
s5, cooling water is introduced into the upper cooling water block (23) and the lower cooling water block (24), the electromagnetic valve (18) is opened to discharge the pressure provided by the pressurizing device, the upper die (3) is separated from the lower die (4), and the formed glass lens is taken out.
2. The precision press molding method of a glass lens according to claim 1, wherein: in the step S2, the upper annular electrode (11) is connected with the positive electrode of the power supply through a lead and is positively charged; the lower annular electrode (12) is connected with the negative electrode of the power supply through a lead and is negatively charged; when the power is turned on, an arc can be formed between the upper ring electrode (11) and the lower ring electrode (12).
3. The precision press molding method of a glass lens according to claim 1, wherein: in step S2, the T 1 The temperature is equal to the yield temperature At + -10 deg.c of the glass material.
4. The precision press molding method of a glass lens according to claim 1, wherein: in step S3, the pressure P 1 The range of the value of (2) is 0.05-5MPa.
5. The precision press molding method of a glass lens according to claim 1, wherein: in step S3, the incubation time t 1 The range of the value of (2) is 20-100s.
6. The precision press molding method of a glass lens according to claim 1, wherein: in step S4, the T 2 The temperature is in the range of 218-222 ℃.
7. The precision press molding method of a glass lens according to claim 1, wherein: in step S4, the pressure P 2 The range of the value of (2) is 0.02-2MPa.
8. The precision press molding method of a glass lens according to claim 1, wherein: in step S4, incubation time t 2 The range of the value of (2) is 10-100s.
9. The precision press molding method of a glass lens according to claim 1, wherein: the upper annular electrode (11) is connected with the upper die (3); the lower annular electrode (12) is connected with the lower die (4); the upper annular electrode (11), the upper die (3), the lower annular electrode (12) and the lower die (4) are all positioned in the vacuum cover (13); inert gas can be introduced into the vacuum cover (13) as protective gas; a temperature sensor is arranged in the vacuum cover (13).
10. The precision press molding method of a glass lens according to claim 1, wherein: the upper cooling water block (23) and the lower cooling water block (24) are externally connected with water pipes.
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| US6260387B1 (en) * | 1998-05-29 | 2001-07-17 | Eastman Kodak Company | Method for fabricating glass preforms for molding optical surfaces in glass elements |
| JP2005075687A (en) * | 2003-09-01 | 2005-03-24 | Hoya Corp | Method of manufacturing preform for precision press molding, preform for precision press molding, optical device and method of manufacturing the same |
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| CN2885551Y (en) * | 2005-12-08 | 2007-04-04 | 北京玻钢院复合材料有限公司 | Production process of fibre preformed body |
| CN102060431B (en) * | 2010-11-25 | 2012-08-15 | 厦门富力或姆光电技术有限公司 | Glass compression molding machine |
| CN104176911B (en) * | 2014-08-22 | 2016-09-21 | 西南科技大学 | A kind of efficiently ultraprecise glass lens non-isothermal compression molding device and forming method |
| CN104569043B (en) * | 2015-01-09 | 2017-01-11 | 上海交通大学 | Device and method for measuring heat transfer coefficient of metal thermoforming interface |
| CN206705957U (en) * | 2017-01-20 | 2017-12-05 | 厦门富力或姆光电技术有限公司 | A kind of full-automatic glass moulding press |
| CN110015837A (en) * | 2018-09-05 | 2019-07-16 | 深圳市森迪源气动设备制造有限公司 | A kind of integrated form station mould pressing method |
| CN212610247U (en) * | 2020-05-29 | 2021-02-26 | 湖南新天力科技有限公司 | Adopt hot air briquetting's curved device of 3D glass heat |
| CN112194350A (en) * | 2020-10-14 | 2021-01-08 | 东莞市凯融光学科技有限公司 | Die pressing method of array lens with convex surface |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6260387B1 (en) * | 1998-05-29 | 2001-07-17 | Eastman Kodak Company | Method for fabricating glass preforms for molding optical surfaces in glass elements |
| JP2005075687A (en) * | 2003-09-01 | 2005-03-24 | Hoya Corp | Method of manufacturing preform for precision press molding, preform for precision press molding, optical device and method of manufacturing the same |
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