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1. 发明专利

JP2002265225A GLASS FUSING DEVICE AND METHOD FOR CHARGING GLASS BLANK 失效
公开(公告)号：JP2002265225A
公开(公告)日：2002-09-18
申请号：JP2001062051
申请日：2001-03-06
申请人： CANON KK
发明人： YOGO TAMAKAZU , KUBO HIROYUKI , SHIGYO ISAMU , TOMITA MASAYUKI
IPC分类号： C03B5/167 , C03B3/00 , C03B5/02
摘要： PROBLEM TO BE SOLVED: To provide a glass fusing device which does not permit the bottom part of a glass fusing vessel to be deformed and formed with a leak hole and, therefore, excludes the fear that a foreign matter defect is incorporated into the discharged glass in the case such that glass blank is charged into a vacant glass fusing vessel for the first time or the glass blank is charged again after the drainage. SOLUTION: This glass fusing device is provided with a glass blank charging pipe which communicates an opening part with a prescribed region in such a manner that the glass bank which is supplied via the opening part for charging the glass blank is charged only on the prescribed region of fused glass surface in the glass fusing vessel. Further, this glass fusing device is provided with a recessed part corresponding to the prescribed region or a parting plate supporting the prescribed region and is set so as to gather the glass fusion liquid into the prescribed region.

2. 发明专利

JP2002128535A FORMING METHOD OF GLASS GOB FOR OPTICAL ELEMENT 失效
公开(公告)号：JP2002128535A
公开(公告)日：2002-05-09
申请号：JP2000316764
申请日：2000-10-17
申请人： CANON KK
发明人： TOMITA MASAYUKI , SHIGYO ISAMU , KUBO HIROYUKI , YOGO TAMAKAZU
IPC分类号： G02B3/00 , C03B11/00 , C03B17/04 , C03B19/02 , C03B19/10 , C03B33/095 , C03B35/00 , C03B40/04
摘要： PROBLEM TO BE SOLVED: To provide a method for forming a minute weighted glass gob with a smooth surface and less variation in weight that can be used as a forming material for an optical element. SOLUTION: An optical glass 3 melted in an optical glass crucible 1 continuously outflows from an outlet 5 of melted glass outflow pipe 4. Transfer speed of the melted glass is controlled to keep desired value using a glass flow transfer control devise 7 by contacting the outer part of melted glass outflowing from the outlet and at the same time the cross sectional area of melted glass is controlled by changing the area, and a glass rod 8 with desired cross sectional area against the glass flow is formed. Then the glass rod is cut into desired length with thermal shock by contacting a cutting blade 9 with ultra low temperature, and a glass gob 11 for optical element is produced. The glass gob 11 is globe shaped by a floating/heating devise 12 and pressed/formed to produce a lens.

3. 发明专利

JP2000119026A PRODUCTION OF GLASS GOB 失效
公开(公告)号：JP2000119026A
公开(公告)日：2000-04-25
申请号：JP29081098
申请日：1998-10-13
申请人： CANON KK
发明人： YOGO TAMAKAZU , TOMITA MASAYUKI , KUBO HIROYUKI , SHIGYO ISAMU
IPC分类号： C03B7/12
摘要： PROBLEM TO BE SOLVED: To obtain a glass gob good in optical quality without any cutting marks, striae and bubbles by, receiving a molten glass stream with a receiving member lowering the resultant glass reservoir at a first lowering speed when a constant weight attains, forming a constricted part, then reducing the lowering speed to a second lowering speed or zero speed and cutting the glass stream with the own weight of the glass and surface tension and heating the glass reservoir. SOLUTION: A receiving member 10 is brought near to a discharging port so that the central part of the contact surface 31 is located in a position at 6.8 mm distance from the discharging port to receive a glass stream 8b. The molten glass is sufficiently collected in the contact surface 31 at that time to form a glass reservoir 9a. The receiving member 10 is then lowered at 120 mm/s speed on the average by about 6 mm to produce a constricted part 23 in the glass stream 8c. When the position of the receiving member 10 is kept in this state for 0.1 s to separate and cut the constricted part 23 by the surface tension of the glass and the own weight of the glass reservoir 9c. Cutting marks 20a and 20b are formed just after the cutting. The receiving member 10 is then lifted at 75 mm/s speed on the average by 3.7 mm to thereby absorb the cutting marks 20a and 20b.

4. 发明专利

JPH11322349A MOLDING OF GLASS PRODUCT 失效
公开(公告)号：JPH11322349A
公开(公告)日：1999-11-24
申请号：JP13965398
申请日：1998-05-21
申请人： CANON KK
发明人： SHIGYO ISAMU , TOMITA MASAYUKI , YOGO TAMAKAZU , KUBO HIROYUKI
IPC分类号： C03B40/00 , C03B7/12 , C03B11/08 , C03B19/02 , C03B40/04
摘要： PROBLEM TO BE SOLVED: To provide a method for molding a glass molded product simply by directly carrying out the press molding and fabrication of a glass product such as an optical element having a highly accurate shape and a high surface accuracy from a molten glass gob in a molten and softened state without using after processing such as grinding or polishing at all. SOLUTION: A molten glass gob is kept at a prescribed temperature for a required time in a temperature region for determining the shape of a glass product so as to provide a temperature difference between the interior and the surface of the glass within 5 deg.C and an applied pressure is increased just before completing the maintenance of the temperature to make the surface of the molten glass gob follow the shape of the molding and transferring surface. The applied pressure is then reduced to simultaneously start the cooling and the resultant shape obtained at the holding temperature is kept in a method for molding a glass molded product comprising press molding the molten glass gob through a gas jetting from the molding and transferring surface of a porous forming mold while maintaining the molten glass gob and the forming mold in a noncontact state, then cooling the press molded glass gob and providing the glass product.

5. 发明专利

JPH11322348A MOLDING OF OPTICAL ELEMENT 失效
公开(公告)号：JPH11322348A
公开(公告)日：1999-11-24
申请号：JP13196698
申请日：1998-05-14
申请人： CANON KK
发明人： KUBO HIROYUKI , YOGO TAMAKAZU , TOMITA MASAYUKI , SHIGYO ISAMU
IPC分类号： G02B1/00 , C03B11/00 , C03B11/08 , C03B11/12 , C03B40/04
摘要： PROBLEM TO BE SOLVED: To provide a method for molding a glass optical element with a high accuracy at highly efficient production by suppressing the slight movement and floating of a glass gob held in a noncontact state on a bottom force, maintaining the glass gob in a stable state and further eliminating a centering subsequent step after the molding. SOLUTION: A glass gob 14 in a softened state at a high temperature is inserted between a top force 2 and a bottom force 1 comprising a porous member and a prescribed gas pressure and gas temperature discharged from a molding and transferring surface are applied to the glass gob 14 to transfer the surface shape of the molding and transferring surface in a noncontact state. In this case, a noncontact engaging means 9 interlocking with operations of the top and bottom forces 2 and 1 is installed and the noncontact engaging means 9 is made opposite to the outer peripheral part of the glass gob 14 corresponding to the outer peripheral part of an optical element formed in a press completing step for forming the optical element from the glass gob 14 by press molding in the noncontact state with the top and bottom forces 2 and 1. Thereby, the outer peripheral part is engaged and held in the noncontact state.

6. 发明专利

JPH09188527A TEMPERATURE CONTROL DEVICE OF GLASS DISCHARGE PIPE 失效
公开(公告)号：JPH09188527A
公开(公告)日：1997-07-22
申请号：JP59196
申请日：1996-01-08
申请人： CANON KK
发明人： YOGO TAMAKAZU , KUBO HIROYUKI , TOMITA MASAYUKI , SHIGYO ISAMU
IPC分类号： C03B7/098 , C03B11/00
摘要： PROBLEM TO BE SOLVED: To provide the temperature control device of a glass discharge pipe, capable of securing the high response of temperature control without causing the increase in the weights of plate-like electrodes, capable of securing rigidity capable of enduring loads due to the thermal expansion of the glass discharge pipe, and further capable of controlling the level of the opening of the glass discharge pipe without relating to the changes in temperature conditions due to the differences of glass materials, etc. SOLUTION: This temperature control device of the glass discharge pipe is provided with electrodes for electrically heating the vertically extended region of the glass discharge pipe 3, when molten glass heated at a described temperature is discharged on a receiving mold 6 from a glass-melting container 1 disposed in a glass-melting oven through the glass discharge pipe, and plate-like electrodes 9, 10 are mounted on the opening part of the glass discharge pipe to maintain the temperature of the discharged glass to a prescribed value. Therein, the plate-like electrodes 9, 10 are at least held and fixed at a prescribed controlled level based on the glass-receiving mold in a glass-received state, and the plate-like electrodes are formed in such shapes that the cross section coefficients of the electrodes increase in the perpendicular direction of the glass-discharging pipe so as to endure a stress loaded by the thermal expansion of the glass discharge pipe 3.

7. 发明专利

JPH08301621A MOLTEN GLASS STOCK AND ITS PRODUCTION AND PRODUCTION UNIT THEREFOR 失效
公开(公告)号：JPH08301621A
公开(公告)日：1996-11-19
申请号：JP1881796
申请日：1996-02-05
申请人： CANON KK
发明人： YOGO TAMAKAZU , SHIGYO ISAMU , KUBO HIROYUKI , TOMITA MASAYUKI
IPC分类号： C03B3/00 , C03B5/033 , C03B5/16 , C03B5/187 , C03B5/24
摘要： PURPOSE: To improve glass melting workability, protect molten glass from contamination and prevent glass quality variation by separating the opening to charge a solid glass stock therethrough from the molten glass stock level in a melting tank with a communicating means. CONSTITUTION: A glass melting oven 1 having an opening 12 to charge a solid glass stock therethrough is divided into a melt clarifying section 2 and a discharge section 3 through a partition wall 4 and is made up of a melt clarifying tank 5, a connecting pipe 6, and a discharge tank 7. The temperatures of the melt clarifying tank 5 and the discharge tank 7 are measured by thermocouples 81, 87, respectively, and these tanks are maintained at respective specified temperatures by heating them with the corresponding heaters 82, 88 through respective regulators 83, 89. A glass stock charge tube 13 is inserted through the opening 12 and the lower end of the tube is immersed in the molten glass 10 in the melt clarifying tank 5, thus serving as a communicating means to set the inside and outside of the oven separate from each other. A solid glass stock 21 is charged via the tube 13 into the tank 5 and melted, clarified and homogenized, and then discharged externally from the tank 7 via a discharge pipe 8, and molded into a glass processed product.

8. 发明专利

JP2511085B2 失效
公开(公告)号：JP2511085B2
公开(公告)日：1996-06-26
申请号：JP33047387
申请日：1987-12-26
申请人： CANON KK
发明人： YOSHIMURA FUMITAKA , SHIGYO ISAMU , NAKANO TOMOMASA
IPC分类号： C03B11/00 , C03B11/08 , C03B11/12 , C03B29/06 , C03B35/00

9. 发明专利

JP2504817B2 失效
公开(公告)号：JP2504817B2
公开(公告)日：1996-06-05
申请号：JP28784988
申请日：1988-11-16
申请人： CANON KK
发明人： SHIGYO ISAMU , OOMORI MASAKI , YOSHIMURA FUMITAKA
IPC分类号： C03B11/00 , C03B11/08

10. 发明专利

JPH0881228A MOLDING DEVICE FOR GLASS LUMP 失效
公开(公告)号：JPH0881228A
公开(公告)日：1996-03-26
申请号：JP21741094
申请日：1994-09-12
申请人： CANON KK
发明人： SHIGYO ISAMU , KUBO HIROYUKI , YOGO TAMAKAZU , TOMITA MASAYUKI
IPC分类号： C03B11/00 , C03B7/12 , C03B7/14 , C03B11/08 , C03B19/02
摘要： PURPOSE: To provide a glass lump molding device for continuously obtaining glass lump having stable weight by constituting the device so as to make weight variability ±1% of molded glass lump and further unlimitedly close to zero under any conditions. CONSTITUTION: In a glass lump molding device by receiving glass flowing out from a flow outlet into a receiving mold M to form glass lump, the device is equipped with a retaining member 2 for holding the receiving mold M, a transporting means 3 which vertically movably holds the retaining member 2, and intermittently is operated to successively transport the retaining member 2 and the receiving mold M to the lower part of the glass flow outlet, an intermittently operating mechanism 4 for intermittently working the transporting means 3 and a vertically driving mechanism 6 for vertically moving the retaining member 2 at a fixed position below the glass flow outlet.

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