CN105209398B - The manufacture device of glass forming body and the manufacture method of glass forming body - Google Patents
The manufacture device of glass forming body and the manufacture method of glass forming body Download PDFInfo
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- CN105209398B CN105209398B CN201480026724.1A CN201480026724A CN105209398B CN 105209398 B CN105209398 B CN 105209398B CN 201480026724 A CN201480026724 A CN 201480026724A CN 105209398 B CN105209398 B CN 105209398B
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- molding
- embossing
- molding die
- embossing part
- glass
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims description 23
- 238000007496 glass forming Methods 0.000 title abstract 3
- 238000000465 moulding Methods 0.000 claims abstract description 256
- 239000011521 glass Substances 0.000 claims abstract description 120
- 238000010438 heat treatment Methods 0.000 claims abstract description 44
- 238000003825 pressing Methods 0.000 claims abstract description 44
- 239000000463 material Substances 0.000 claims abstract description 36
- 238000004049 embossing Methods 0.000 claims description 91
- 238000001816 cooling Methods 0.000 claims description 28
- 238000010583 slow cooling Methods 0.000 abstract description 18
- 238000000748 compression moulding Methods 0.000 abstract 1
- 238000002791 soaking Methods 0.000 description 15
- 238000007665 sagging Methods 0.000 description 8
- 238000010791 quenching Methods 0.000 description 7
- 230000000171 quenching effect Effects 0.000 description 7
- 238000011282 treatment Methods 0.000 description 7
- 230000007547 defect Effects 0.000 description 6
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 230000009477 glass transition Effects 0.000 description 5
- 201000009310 astigmatism Diseases 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 239000011261 inert gas Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
- C03B11/02—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing in machines with rotary tables
-
- 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
-
- 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
- C03B11/16—Gearing or controlling mechanisms specially adapted for glass presses
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2215/00—Press-moulding glass
- C03B2215/60—Aligning press die axes
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2215/00—Press-moulding glass
- C03B2215/69—Controlling the pressure applied to the glass via the dies
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2215/00—Press-moulding glass
- C03B2215/72—Barrel presses or equivalent, e.g. of the ring mould type
Landscapes
- 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)
- Manufacturing Of Magnetic Record Carriers (AREA)
Abstract
The heat for suppressing molding head and mould when being molded and handling is mobile.The manufacture device of glass forming body possesses：Heating chamber, it contains the mould of glass material to inside and heated；1st and the 2nd molding room, it has molding head (49), and by using molding head (49) pressing mould, compression molding is carried out to the glass material of heating and softening；1st and the 2nd slow cooling room, it is cooled down to mould；And heater, it is arranged in heating part, the 1st molding room and the 2nd molding room, mould is heated, wherein, formed with using the multiple convex portions (press section) (49B) for abutting and being pressed with mould when being molded head (49) pressing mould and in the recess (49A) not contacted using being molded when head (49) presses mould with mould in the opposed faces opposed with mould in molding head (49).
Description
Technical Field
The present invention relates to a glass molding production apparatus and a glass molding production method, and more particularly to a glass molding production apparatus and a glass molding production method for producing a glass molding by pressing a mold heated by a heater with a mold head.
Background
Conventionally, for example, a device described in patent document 1 (japanese patent publication No. 7-29779) has been widely used: the glass is formed by sequentially circulating a plurality of forming molds through a heating chamber, a soaking chamber, a molding pressure chamber, and a cooling chamber provided along the circumference by a rotary table, and performing each process of heating, soaking, molding, and cooling (including slow cooling) in each process section.
Documents of the prior art
Patent document
Patent document 1: japanese examined patent publication (Kokoku) No. 7-29779
Disclosure of Invention
Problems to be solved by the invention
In the apparatus for manufacturing a glass molded body described in patent document 1 (japanese patent publication No. 7-29779), heaters are provided in a soaking chamber and a pressing chamber to secure a temperature suitable for pressing, and a pressing head and a molding die for pressing a molding die are heated by the heaters. In the above-described manufacturing apparatus, the temperature of the ram and the temperature of the molding die are not generally raised to the set temperature of the heater, and the temperature of the ram is higher than the temperature of the molding die.
In this way, a temperature difference is generated between the ram and the molding die because the ram and the molding die have different volumes and different materials, and thus have different heat capacities. In this way, since the difference in heat capacity exists between the head and the mold, even if a predetermined temperature is secured in the soaking chamber and the molding chamber by the heater, the thermal balance between the heat received from the heater and the heat radiated from the heater is different between the head and the mold, and a temperature difference occurs.
In recent years, the following apparatuses for producing a glass molded body have been used: a1 st and a 2 nd molding chambers are provided, and molding is performed at a temperature not lower than a glass sagging temperature in the 1 st molding chamber, and molding is performed by gradually cooling a molding die in the 2 nd molding chamber. In the apparatus for producing a glass molded body, the temperature of the mold head in the 2 nd molding chamber is lower than the temperature of the molding die conveyed to the 2 nd molding chamber.
As described above, when the mold pressing process is performed in a state where a temperature difference is generated between the head and the mold, heat moves between the head and the mold when the head and the mold are in contact with each other, and the temperature of the upper portion of the mold changes. Therefore, the glass material has a problem that the temperature distribution is not uniform, and a lens shape defect (curvature variation asymmetrical with respect to the center, that is, astigmatism or the like) occurs.
The present invention has been made in view of the above problems, and an object thereof is to suppress heat transfer between a molding ram and a molding die during a molding process.
Means for solving the problems
The apparatus for producing a glass molding of the present invention comprises: a heating unit that heats a molding die in which a glass material is accommodated; a press molding portion having a press head, which presses the press molding die by using the press head to perform press molding on the glass material softened by heating; a cooling unit that cools the molding die; and a heater which is provided at least in the heating portion and the molding portion and heats the molding die, wherein a plurality of pressing portions which are brought into contact with the molding die and press the molding die when the molding die is pressed by the molding head, and a concave portion which is not brought into contact with the molding die when the molding die is pressed by the molding head are formed on a surface of the molding head which faces the molding die.
The method for producing a glass molded body of the present invention produces a glass molded body using a glass molded body production apparatus, the glass molded body production apparatus including: a heating unit that heats a molding die in which a glass material is accommodated; a press molding portion having a press head, which presses the press molding die by using the press head to perform press molding on the glass material softened by heating; a cooling unit that cools the molding die; and a heater provided at least in the heating portion and the molding portion and heating the molding die, wherein the method for manufacturing a glass molded body includes: a heating step of heating the molding die by a heating part; a molding step of pressing the molding die after the heating step by a molding head by using a molding portion to mold the glass raw material accommodated therein; and a cooling step of cooling the molding die after the molding step by a cooling section, wherein a plurality of pressing sections that are pressed against the molding die in the molding step and a recessed section that is not in contact with the molding die in the molding step are formed on a surface of the mold head that faces the molding die.
According to the present invention, since the concave portion is formed on the surface of the punch that faces the molding die, the contact area between the molding die and the punch can be reduced. Thus, even if there is a temperature difference between the molding die and the indenter, heat transfer between the indenter and the molding die can be reduced. This can suppress temperature unevenness of the glass molded body and prevent the occurrence of lens shape defects (astigmatism).
Effects of the invention
According to the present invention, since thermal movement between the mold head and the mold can be suppressed during the molding process, temperature unevenness of the glass molded body can be suppressed, and generation of a lens shape defect can be suppressed.
Drawings
Fig. 1 is a horizontal cross-sectional view showing the structure of an apparatus for producing a glass molded body used in the present embodiment.
Fig. 2 is a sectional view II-II in fig. 1.
Fig. 3 is a side view showing the head of fig. 2 in an enlarged manner.
Fig. 4 is a bottom view showing the opposite side of the die ram.
Fig. 5 is a sectional view showing the mold unit in an enlarged manner.
Fig. 6 is a graph showing the temperature of the glass material (glass molded body) and the pressure applied to the glass material in each process for glass molding in the method for producing a glass molded body according to the present embodiment.
Fig. 7 is a view showing the opposite surfaces of the die head of another embodiment.
Fig. 8 is a longitudinal sectional view of another embodiment embossing head.
Detailed Description
An embodiment of a manufacturing apparatus and a manufacturing method of a glass molded body according to the present invention will be described in detail below with reference to the drawings. In each embodiment, portions having common structures and functions are denoted by the same reference numerals, and description thereof is omitted.
Fig. 1 is a horizontal sectional view showing the structure of an apparatus for producing a glass molded body used in the present embodiment, and fig. 2 is a sectional view taken along line II-II in fig. 1. As shown in fig. 1, the apparatus 1 for producing a glass molded body according to the present embodiment includes an apparatus casing 2 formed in a bottomed cylindrical shape, a turntable 4 provided in the apparatus casing 2, and an inner case 6 provided above the turntable 4 and having an arc-shaped horizontal cross section. The apparatus housing 2, the inner case 6, and the turntable 4 are concentrically and coaxially arranged.
The apparatus housing 2 is provided with a substantially circular upper cover and a substantially circular bottom plate (not shown) at the upper and lower sides thereof, and the inside thereof is sealed. The inner space of the apparatus housing 2 is an inert gas atmosphere. As the inert gas, nitrogen gas, argon gas or the like is used, and the oxygen concentration is preferably 5ppm or less. In addition, by making the internal space an inert gas atmosphere in this way, oxidation of the mold unit 8 and surface deterioration of the glass material can be prevented.
A carrying-in/out port (not shown) through which the molding die can be supplied into the apparatus and can be carried out from the apparatus is formed in the upper cover, and a carrying-in/out portion 50 is formed in the apparatus below the carrying-in/out port. In the present embodiment, the carrying-in/out section 50 has both the supply section and the carrying-out section in the present invention, but the carrying-in section (supply section) and the carrying-out section (carrying-out port) may be provided separately.
The turntable 4 is rotated by a driving mechanism (not shown) such as a motor, for example, and the mold units 8 arranged on the turntable 4 are conveyed on the same circle. In addition, the mold unit 8 includes a molding mold 52 and a mold supporting member 12. A plurality of circular openings 4A (fig. 2) are formed at equal angular intervals on a circumference of a predetermined radius above the turntable 4. The diameter of the opening 4A is smaller than the diameter of the bottom portion 12A of the mold supporting member 12 constituting the mold unit 8. As described later, the mold unit 8 is disposed in the opening 4A of the turntable 4, and is moved around each processing chamber in the inner casing 6 by the rotation of the turntable 4. In the present embodiment, the drive mechanism of the turntable 4 intermittently rotates by a predetermined angle at predetermined intervals, thereby conveying the mold units 8 along a circumference of a predetermined radius. The path through which the mold unit 8 is conveyed corresponds to the conveying path of the present embodiment.
The turntable 4 is stopped for a predetermined time between the respective rotation operations. The stop time of the turntable 4 is determined to be longer than the time required for the embossing process in the 1 st and 2 nd embossing chambers described later.
The inner case 6 has: an inner wall 6A extending in an arc shape within a predetermined angular range in the horizontal direction coaxially with the apparatus housing 2; an outer wall 6B located radially outward of the inner wall 6A and extending in an arc shape within a predetermined angle range in the horizontal direction; a top plate 6C that closes the space between the inner wall 6A and the upper part of the outer wall 6B; and a bottom portion 6D that blocks between the lower portions of the inner wall 6A and the outer wall 6B. A treatment space having a horizontal cross section in an arc shape is formed in the inner case 6 by the inner wall 6A, the outer wall 6B, the top plate 6C, and the bottom part 6D. An arc-shaped slit 6E is formed in the bottom portion 6D of the inner case 6 along the conveying path of the die unit 8. The width of the slit 6E is larger than the diameter of the support portion 12B of the mold support member 12 on which the mold unit 8 is placed.
The processing space of the inner casing 6 is divided into 7 chambers in a certain angular range in the rotation direction of the turntable 4. These 7 chambers are arranged in the order of heating chamber 20, soaking chamber 22, 1 st molding chamber 24, 1 st gradually cooling chamber 26, temperature holding chamber 28, 2 nd molding chamber 30, and 2 nd gradually cooling chamber 32 along the conveying path of mold unit 8. A shutter (not shown) is provided between each chamber and the circumferential end of the inner case 6.
Heaters 34, 36, 38, 40, 42, 44, 46 are provided in the heating chamber 20, the soaking chamber 22, the 1 st molding chamber 24, the 1 st slow cooling chamber 26, the temperature holding chamber 28, the 2 nd molding chamber 30, and the 2 nd slow cooling chamber 32, respectively. These heaters 34, 36, 38, 40, 42, 44, and 46 are provided on both sides of the conveyance path of the mold unit 8, and heat the inside of the heating chamber 20, the soaking chamber 22, the 1 st molding chamber 24, the 1 st slow cooling chamber 26, the temperature holding chamber 28, the 2 nd molding chamber 30, and the 2 nd slow cooling chamber 32 to a predetermined temperature.
As shown in fig. 1, a quenching section 48 and a carrying-in/carrying-out section 50 are formed between the 2 nd slow cooling chamber 32 and the heating chamber 20 in the conveyance path in the apparatus housing 2. The quenching section 48 is a region for rapidly cooling the mold unit 8, and no heater is disposed around the quenching section. The carry-in/out section 50 is a region for replacing the molding die in which the molded glass molded body is accommodated and the molding die in which a new glass material that has not been subjected to molding processing is accommodated through the carry-in/out port. The carry-in/out section 50 is provided with a carry-in/out mechanism capable of moving up and down the mold unit 8, for example, having a drive shaft or the like capable of being inserted through the opening 4A of the turntable 4, and the mold unit 8 is lifted up by the carry-in/out mechanism, whereby the molded mold 52 is taken out from the carry-in/out opening and a new mold 52 can be placed on the mold support member 12.
As shown in fig. 2, a molding mechanism 47 is provided above the 1 st molding chamber 24 of the apparatus housing 2. The molding mechanism 47 includes a driving device 47A, which is housed in a housing chamber provided above the top plate 2C of the device housing 2 and is constituted by an actuator such as a hydraulic jack or a motor such as a servo motor, for example, and a molding head 49 attached to a tip end of a driving shaft 47B of the driving device 47A.
Openings are formed in the device housing 2 and the lower side of the main body of the drive device 47A of the top plates 2C, 6C of the inner case 6. A drive shaft 47B of the drive device 47A is inserted through the openings of the device housing 2 and the inner case 6, and the lower end thereof reaches the inside of the molding chamber 24. Then, by driving the driving device 47A, the stamper 49 is lowered, and the die unit 8 in the stamper press chamber 24 is pressed from above. Further, a support table 45 is provided between the turntable 4 and the apparatus housing 2 below the drive device 47A. When the driving device 47A presses the mold unit 8, the support table 45 supports the turntable 4 from below, thereby preventing deformation of the turntable 4.
Fig. 3 is a side view showing the embossing head 49 in fig. 2 in an enlarged manner, and fig. 4 is a bottom view showing the opposite surface of the embossing head 49. As shown in fig. 3 and 4, in the apparatus 1 for producing a glass molded body according to the present embodiment, a plurality of linear concave portions 49A extending in a lattice shape are formed on the opposed surface of the mold head 49, and thereby a plurality of rectangular convex portions 49B are arranged in a row and column at intervals. Therefore, in the present embodiment, the linear recessed portions 49A of the indenter 49 are line-symmetric in the up-down direction and the left-right direction, and are rotationally symmetric (point-symmetric) about the center of the indenter 49. Each linear recess 49A can be easily formed by machining using a groove machining tool such as an end mill.
By forming the recessed portion (linear recessed portion 49A) on the facing surface, the remaining portion becomes a plurality of protruding portions 49B protruding from the bottom surface of the recessed portion. The top surfaces of the convex portions 49B are located on substantially the same plane, and a surface of the top surface of the convex portion 49B which is in contact with the molding die is a pressing surface. Specifically, the pressing surface is a top surface of the convex portion 49B in a circle C1 shown by a chain line in fig. 4. The circle C1 has a diameter equal to the outer diameter of the cylindrical mold 58 constituting the molding die 52 shown in fig. 5.
The depth of the linear recess 49A is preferably 0.5mm or more. This is because, when the depth of the linear recessed portion 49A is less than 0.5mm, the height of the convex portion 49B of the pressing die unit 8 becomes low at the time of press molding as a result of abrasion and deformation caused by several hundred or more pressing, and heat transfer occurs between the concave portion 49A and the die head 49. However, when the depth of the linear recess 49A exceeds 50mm, the projection 49B is too high, and the projection 49B may be inclined or missing, and therefore, the depth of the linear recess 49A is preferably 50mm or less.
Further, the interval between adjacent linear recesses 49A (i.e., the width of the convex portion 49B) is preferably formed to be substantially equal to the width of the linear recess 49A. Further, the total area of the linear recesses 49A is preferably 50% or more of the area of the opposed surface of the stamper 49. With this configuration, the thermal movement between the press ram 49 and the molding die 52 can be sufficiently suppressed, and the occurrence of molding defects (astigmatism) in the glass molded body can be suppressed.
As shown in fig. 4, the stamper 49 is configured such that, when equally divided by a virtual line passing through the center O of the opposed surface (for example, when equally divided by a virtual line L1 and a virtual line L2), the occupancy ratio of the recessed portions 49A in each divided region (that is, the ratio of the area of the recessed portions 49A in each region to the area of the opposed surface) is 50% or more. For example, in the case where the radius of the stamper 49 is 30mm, the area of the opposed surface is 900 π mm2. In this case, the area of 1 region divided into four equal parts by the imaginary line is 225 π mm2. The area of the concave portion 49A in the divided region is 225 π mm that is the area of the opposite surface of the divided region250% (112.5 π mm)2) The above.
The difference in the occupancy ratio of the concave portions 49A in each divided region is within 20%. For example, in the case where the radius of the stamper 49 is 30mm, the area of the opposed surface is 900 π mm2Quartering by means of imaginary linesThe area of 1 region was 225 π mm2. Further, the concave portions 49A are formed in such a manner that the difference (variation) in the occupancy ratio of the concave portions 49A between the 4 divided regions is 20% at maximum. For example, the area of the concave portion 49A in the divided region is 112.5 π mm at most2Minimum 90 π mm2Within. The difference in the occupancy ratio of the concave portions 49A in each region is preferably within 10%, and more preferably substantially none.
According to this configuration, in addition to sufficiently suppressing the heat transfer between the die head 49 and the molding die 52, the recessed portions 49A can be formed substantially uniformly over the entire surface, and therefore, the occurrence of unevenness in the heat transfer between the die head 49 and the molding die 52 can be suppressed without causing variation in the pressing surface.
The 2 nd molding chamber 30 is also provided with a molding mechanism similar to the molding mechanism 47 of the 1 st molding chamber 24 described with reference to fig. 2 and 3, and a lattice-shaped linear recess 49A shown in fig. 4 is also formed in the molding head of the molding mechanism of the 2 nd molding chamber 30.
Fig. 5 is an enlarged sectional view showing the mold unit 8. As shown in the figure, the mold unit 8 includes a molding die 52 and a mold support member 12, and the molding die 52 is placed on the mold support member 12. The mold (molding die) 52 includes an upper die 54 and a lower die 56 having molding surfaces formed by joining the shapes of the glass molded bodies to be produced, and a cylindrical die 58 for regulating the radial mutual positions of the upper die 54 and the lower die 56. A release film for preventing melting with glass is formed on the molding surfaces of the upper mold 54 and the lower mold 56. The glass material 60 is arranged in a state of being sandwiched between the upper mold 54 and the lower mold 56. The upper and lower molds 54 and 56 are pressed in a relatively close direction while the glass material 60 is heated to a temperature equal to or higher than the glass sagging temperature, whereby the shape of the molded surface is transferred to the glass material, and a glass molded body (optical element) having a desired shape can be press-molded.
Next, a method for producing a glass molded body by the glass molded body production apparatus 1 of the present embodiment will be described. In the following description, the method of producing a glass molded body is described focusing on one mold unit 8, but in the apparatus 1 for producing a glass molded body of the present embodiment, a plurality of mold units 8 are continuously conveyed along a conveying path by the rotary table 4, and are subjected to processes such as heating, pressing, slow cooling, and the like in parallel in each processing chamber. Fig. 6 is a graph showing the temperature of the glass material (glass molded body) 60 and the pressure applied to the glass material in each process for glass molding in the method for producing a glass molded body according to the present embodiment, in which the horizontal axis represents time and the vertical axis represents temperature and pressure.
When the rotary table 4 rotates and the mold unit 8 containing the molded glass molded body reaches the carrying-in/out section 50, the mold unit 8 is lifted up by the carrying-in/out mechanism, and the plurality of molded molds 52 after the molding process are simultaneously carried out from the carrying-in/out opening to the outside of the apparatus housing 2. Then, the molding dies 52 are held by a robot not shown, and the molding dies 52 on the die supporting member 12 are taken out. Then, the molding die 52 containing a new glass material is supplied to the mold supporting member 12.
When a predetermined stop time of the turntable 4 has elapsed since the completion of the previous rotation operation, the gates provided between the circumferential end of the inner casing 6 and the chambers are opened, and the turntable 4 is rotated by a predetermined angle again. Thereby, the mold unit 8 is conveyed into the heating chamber 20 while being held by the mold supporting member 12. At this time, the mold supporting member 12 passes through the slit 6E provided in the bottom of the inner case 6, and the mold supporting member 12 and the inner case 6 do not interfere with each other.
When the mold unit 8 is conveyed into the heating chamber 20, the heating step is performed. That is, in the heating chamber 20, the mold unit 8 is heated by the heaters 34 provided on both sides of the conveyance path. The heater of the heating chamber 20 is set to a temperature higher than the glass sagging temperature Ts, and thereby the mold unit 8 is heated to the degree of the glass sagging temperature Ts.
When a predetermined stop time of the turntable 4 has elapsed since the previous rotation, the gates provided between the circumferential end of the inner casing 6 and the chambers are opened, and the turntable 4 is rotated again by a predetermined angle. Thereby, the mold unit 8 is conveyed into the soaking chamber 22 while being held on the mold supporting member 12.
When the mold unit 8 is conveyed into the soaking chamber 22, the 1 st soaking step is performed. In the soaking chamber 22, a temperature higher than the glass sagging temperature Ts by several tens ℃ is secured by the heater 36. Thereby, the mold unit 8 and the glass material 60 in the mold unit 8 are uniformly heated to the glass sagging temperature Ts.
When a predetermined stop time of the turntable 4 has elapsed since the previous rotation, the gates provided between the circumferential end of the inner casing 6 and the chambers are opened, and the turntable 4 is rotated again by a predetermined angle. Thereby, the mold unit 8 is conveyed into the 1 st molding chamber 24 while being held on the mold support member 12.
When the die unit 8 is conveyed into the 1 st molding chamber 24, the 1 st molding step of pressing the molding die 52 in the up-down direction by the molding mechanism 47 is performed. In the present embodiment, the embossing treatment is performed twice in the 1 st embossing step. In the present embodiment, the 1 st embossing process is performed in a shorter time than the 2 nd embossing process, and the embossing pressures in the respective embossing processes are equal.
The 1 st molding chamber 24 is maintained at a temperature higher than the glass sagging temperature Ts by several tens ℃ (for example, about 10 ℃ to 30 ℃) by the heater 38. Here, as described above, since the volume and the material of the die head 49 and the die unit 8 are different, the heat capacities are different. Therefore, in the embossing head 49 and the die unit 8, the balance (difference) of the amount of heat received from the heater 38 and the amount of heat emitted from itself is different. Specifically, the die head 49 emits less heat from itself than the die unit 8. Thus, although the soaking chamber 22 and the 1 st molding chamber 24 both ensure a temperature higher than the glass sagging temperature Ts by about 10 to 30 ℃, the temperature of the stamper head 49 is higher than that of the mold unit 8 when the mold unit 8 is conveyed into the 1 st molding chamber 24. Therefore, in the 1 st press molding step, heat moves from the press head 49 toward the molding die 52 while the molding die 52 is pressed by the press head 49, and thereby the temperature distribution of the glass material 60 in the molding die 52 may not be uniform.
In contrast, in the present embodiment, a plurality of linear recessed portions 49A are formed in a lattice shape on the surface of the stamper 49 facing the mold 52, and only the raised portions 49B (pressing portions) abut on the upper surface of the mold 52. Therefore, heat transfer from the press head 49 to the molding die 52 can be suppressed, and occurrence of temperature unevenness of the glass material contained in the molding die 52 can be suppressed.
When a predetermined stop time of the turntable 4 has elapsed since the previous rotation, the gates provided between the circumferential end of the inner casing 6 and the chambers are opened, and the turntable 4 is rotated again by a predetermined angle. Thereby, the mold unit 8 is conveyed into the 1 st gradually cooling chamber 26 while being held on the mold supporting member 12.
When the mold unit 8 is conveyed into the 1 st slow cooling chamber 26, the 1 st slow cooling step is performed. In the 1 st gradually cooling chamber 26, the same temperature as or lower than the temperature (Tg +10 ℃) higher by 10 ℃ than the glass transition temperature is secured by the heaters 40 provided on both sides of the conveying path. However, the temperature in the 1 st gradually cooling chamber 26 is controlled so as not to be lower than the glass transition temperature by the heater 40. Thus, the temperature of the primary molded body (glass material after the 1 st press molding step) in the mold unit 8 conveyed into the 1 st gradually cooling chamber 26 is gradually cooled to a temperature (Tg +10 ℃) higher by 10 ℃ than the glass transition temperature.
When a predetermined stop time of the turntable 4 has elapsed since the previous rotation, the gates provided between the circumferential end of the inner casing 6 and the chambers are opened, and the turntable 4 is rotated again by a predetermined angle. Thus, the mold unit 8 is conveyed from the 1 st gradually-cooling chamber 26 into the temperature-keeping chamber 28 while being held on the mold-supporting member 12.
When the mold unit 8 is conveyed into the temperature holding chamber 28, the 2 nd soaking step is performed. In the temperature holding chamber 28, a temperature level higher by 10 degrees or more than 10 degrees than the glass transition temperature is secured by the heaters 42 provided on both sides of the conveying path. Thereby, the mold unit 8 is uniformly heated to Tg +10 ℃.
When a predetermined stop time of the turntable 4 has elapsed since the previous rotation, the gates provided between the circumferential end of the inner casing 6 and the chambers are opened, and the turntable 4 is rotated again by a predetermined angle. Thereby, the mold unit 8 is conveyed from the temperature holding chamber 28 into the 2 nd molding chamber 30 while being held on the mold supporting member 12.
When the mold unit 8 is conveyed into the 2 nd molding chamber 30, the 2 nd molding step is performed. In the present embodiment, the 2 nd embossing step is also performed twice. In addition, regarding the two-time embossing treatment, the 1 st embossing treatment is performed in a shorter time than the 2 nd embossing treatment, and the embossing pressures in the respective embossing treatments are equal to each other and smaller than the embossing pressure in the 1 st embossing step.
Here, as shown in fig. 6, in the 2 nd press molding step, the temperature of the glass molded body is lowered from Tg +10 ℃ to a temperature lower than Tg, and press molding treatment is performed. Therefore, in the 2 nd embossing chamber 30, a temperature lower than Tg is ensured by the heater 44. Therefore, when the mold unit 8 is conveyed to the 2 nd molding chamber 30, the temperature of the molding head of the molding mechanism of the 2 nd molding chamber 30 becomes lower than Tg.
In contrast, as described above, the mold unit 8 is uniformly heated to Tg +10 ℃ in the temperature holding chamber 28. Therefore, in the 2 nd press molding step, heat moves from the molding die 52 to the press head 49 while the molding die 52 is pressed by the press head 49, and thereby the temperature distribution of the glass material 60 in the molding die 52 may not be uniform.
In contrast, in the present embodiment, in the molding mechanism of the 2 nd molding chamber 30, a plurality of linear concave portions are formed in a lattice shape on the opposed surface of the molding head, and only the convex portion (pressing portion) abuts on the upper surface of the molding die 52. Therefore, heat transfer from the press head 49 to the molding die 52 can be suppressed, and occurrence of temperature unevenness of the glass material contained in the molding die 52 can be suppressed.
When a predetermined stop time of the turntable 4 has elapsed since the previous rotation, the gates provided between the circumferential end of the inner casing 6 and the processing chambers are opened, and the turntable 4 is rotated again by a predetermined angle. Thereby, the mold unit 8 is conveyed into the 2 nd slow cooling chamber 32 while being held by the mold supporting member 12.
When the mold unit 8 is conveyed into the 2 nd slow cooling chamber 32, the 2 nd slow cooling step is performed. In the 2 nd annealing chamber 32, a predetermined temperature lower than the glass transition temperature is secured by heaters 46 provided on both sides of the conveyance path. Thereby, the mold unit 8 conveyed into the 2 nd slow cooling chamber 32 and the secondary molded body (the primary molded body after the 2 nd molding step) in the mold unit 8 are slowly cooled.
When a predetermined stop time of the turntable 4 has elapsed since the previous rotation, the gates provided between the circumferential end of the inner casing 6 and the processing chambers are opened, and the turntable 4 is rotated again by a predetermined angle. Thereby, the mold unit 8 is conveyed to the rapid cooling section 48 outside the inner case 6 while being held by the mold supporting member 12.
When the mold unit 8 is conveyed to the quenching section 48, a quenching step is performed. The quenching section 48 is not provided with a heater, and has a temperature as high as that around the apparatus. Therefore, the mold unit 8 is rapidly cooled. The cooling rate in this case is preferably higher than the cooling rate in the slow cooling step, and is set appropriately within a range of 30 to 300 ℃/min, for example. Further, the cooling gas may be blown toward the die unit 8 as necessary.
When a predetermined stop time of the turntable 4 has elapsed since the previous rotation, the turntable 4 is rotated again by a predetermined angle. Thereby, the mold unit 8 is conveyed to the carry-in/carry-out section 50 while being held on the mold supporting member 12.
When the mold unit 8 is conveyed to the carry-in/carry-out section 50, the replacement step is performed. When the rotation of the rotary table 4 is completed and the mold unit 8 containing the molded glass molded body reaches the carrying-in/out section 50, the mold unit 8 is lifted by the carrying-in/out mechanism, and a plurality of molded molds 52 having been subjected to the molding process are simultaneously carried out from the carrying-in/out opening to the outside of the apparatus housing 2. Then, the molding die 52 containing a new glass material is supplied to the mold supporting member 12.
Through the above steps, a glass molded body can be produced.
According to the present embodiment, since the plurality of linear recesses 49A are formed in a lattice shape on the opposed surface of the die head 49 of the die mechanism 47 provided in the 1 st and 2 nd die chambers 24 and 30, only the rectangular convex portion 49B drawn by the linear recess 49A abuts on the upper surface of the mold 52, and the contact area between the mold 52 and the die head 49 can be reduced. Thus, even if there is a temperature difference between the molding die 52 and the ram 49 when the molding die is conveyed to the molding chambers 24 and 30, the heat transfer from the ram 49 to the molding die 52 can be suppressed in the 1 st molding chamber 24, and the heat transfer from the molding die 52 to the ram 49 can be suppressed in the 2 nd molding chamber 30. Therefore, temperature unevenness of the glass molded body can be suppressed, and generation of lens shape defects (astigmatism) can be suppressed.
Further, according to the present embodiment, the linear recessed portion 49A of the indenter 49 is formed so as to be line-symmetric in the vertical direction and the horizontal direction and so as to be rotationally symmetric (point-symmetric) about the center of the indenter 49, so that it is possible to prevent the pressure applied to the molding die 52 from being uneven at the time of the molding process.
In addition, although the case where the glass molded body is produced by the glass molded body production apparatus 1 having the 1 st and 2 nd press chambers 24 and 30 has been described in the present embodiment, the present invention is not limited to this, and can be applied to a glass molded body production apparatus having only one press chamber.
In the present embodiment, the manufacturing apparatus has been described which performs various processes including the press molding process while conveying the mold unit 8 in which the molding dies 52 are respectively placed on the support portions 12B erected on the mold support base 12, but the present invention is also applicable to an apparatus which performs the press molding process on a plurality of molding dies without using the mold support base 12 for conveyance. Further, instead of the manufacturing apparatus that intermittently rotates the molding die 52 along the circular path by the rotary table 4 to perform various processes as in the above-described embodiment, the present invention can also be applied to a manufacturing apparatus that linearly conveys the molding die 52.
In the present embodiment, the case where the plurality of linear recesses 49A are formed in a lattice shape on the facing surface of the stamper 49 has been described, but the shape of the recesses formed on the facing surface of the stamper 49 is not limited to this. Fig. 7 is a view showing an opposite surface of the stamper head 149 of another embodiment. As shown in the drawing, in this embodiment, a circular recess 149A is formed in the center of the die head 149, and a plurality of annular recesses 149B having concentric annular shapes are formed. Thus, a plurality of concentric annular convex portions (pressing portions) 149C are drawn on the die head 149. The die head 149 also exhibits the same effects as those of the above embodiment.
In the present embodiment, the total area of the recesses is also 50% or more of the area of the opposed surface of the stamper head 149.
In the present embodiment, similarly to the embodiment shown in fig. 4, the stamper head 149 is configured such that the occupancy ratio of the circular concave portion 149A and the annular concave portion B in each divided region is 50% or more when equally divided by a virtual line passing through the center of the facing surface. The difference in the occupancy ratio of the recesses (149A, 149B) between the divided regions is within 20%.
Further, the present invention can be applied to a die head 249 shown in fig. 8. That is, the die head 249 has a cylindrical 1 st head 71 for positioning the cylindrical die 58 by bringing the cylindrical die 58 into pressure contact with a lower die (not shown), a 2 nd head 72 inserted into the 1 st head 71 and pressing only the upper die 54, and a spring member 73 interposed between the 1 st head 71 and the 2 nd head 72, and recesses 71A and 72A are formed in the opposed surfaces of the 1 st head 71 and the 2 nd head 72 opposed to the molding dies, respectively. According to this mold head 249, the 2 nd head 72 presses the upper mold 54 to mold the glass material in a state where the 1 st head 71 positions the barrel mold 58 and the lower mold relative to each other, so that the relative inclination of the upper and lower molds can be suppressed, and a highly accurate glass molded body can be produced. Further, the recesses 71A and 72A can suppress heat transfer between the mold head 249 and the molding die, thereby achieving temperature equalization of the glass molded body and suppressing occurrence of lens shape defects.
The present invention will be summarized below with reference to the drawings.
As shown in fig. 1, a glass molding production apparatus 1 according to the present embodiment includes: a heating chamber 20 for heating a molding die 52 in which a glass material is accommodated; 1 st and 2 nd press chambers 24, 30 having a press ram 49 as shown in fig. 2, press-molding the heat-softened glass material by pressing a molding die 52 with the press ram 49; 1 st and 2 nd slow cooling chambers 26, 32 that cool the molding die 52; and heaters 34, 36, 38, 40, 42, 44, and 46 provided in the heating section 20, the soaking chamber 22, the 1 st compression chamber 24, the 1 st gradually-cooling chamber 26, the temperature holding chamber 28, the 2 nd compression chamber 30, and the 2 nd gradually-cooling chamber 32 to heat the molding die, and as shown in fig. 3 and 4, a plurality of convex portions (pressing portions) 49B that are brought into contact with and pressed against the molding die 52 when the molding die 52 is pressed by the compression head 49, and a concave portion 49A that is not brought into contact with the molding die 52 when the molding die 52 is pressed by the compression head 49 are formed on a surface of the compression head 49 that faces the molding die 52.
Description of the reference symbols
1: a glass molding manufacturing device; 2: a device frame body; 4: a rotating table; 6: an inner housing; 8: a mold unit; 12: a mold support member; 20: a heating section; 22: a soaking part; 24: 1 st molding chamber; 26: the 1 st slow cooling chamber; 28: a temperature-maintaining chamber; 30: 2 nd molding chamber; 32: a 2 nd slow cooling chamber; 34. 36, 38, 40, 42, 44, 46: a heater; 47: a molding mechanism; 47A: a drive device; 47B: a drive shaft; 48: a quenching section; 49. 149: a die head; 49A: a linear recess; 49B, 149C: a convex portion; 50: a carrying-in/carrying-out section; 52: forming a mold; 149A: a circular recess; 149B: an annular recess.
Claims (23)
1. An apparatus for producing a glass molded body, comprising:
a heating unit that heats a molding die in which a glass material is accommodated;
a press molding section having a press head, the press molding section pressing the molding die by the press head to mold the glass material softened by heating;
a cooling unit that cools the molding die; and
a heater provided at least in the heating portion and the molding portion and heating the molding die,
wherein,
the mold press head has a plurality of pressing portions that are formed on a surface of the mold press head that faces the molding die, the pressing portions being configured to abut against and press against the molding die when the molding die is pressed by the mold press head, and a recessed portion that is not configured to contact with the molding die when the molding die is pressed by the mold press head.
2. The apparatus for producing a glass molding according to claim 1,
the total area of the recesses formed in the die head is 50% or more of the area of the opposed surface.
3. The apparatus for producing a glass molding according to claim 1 or 2,
the die head is configured such that, when the opposing surface is equally divided by an imaginary line passing through the center of the opposing surface, the ratio of the total area of the recessed portions in each divided region to the area of the opposing surface is 50% or more.
4. The apparatus for producing a glass molding according to claim 1 or 2,
the die head is configured such that, when the opposing surface is divided equally by an imaginary line passing through the center of the opposing surface, the difference between the regions is within 20% of the occupation ratio of the total area of the recessed portions to the area of the opposing surface in each of the divided regions.
5. The apparatus for producing a glass molding according to claim 3,
the die head is configured such that, when the opposing surface is divided equally by an imaginary line passing through the center of the opposing surface, the difference between the regions is within 20% of the occupation ratio of the total area of the recessed portions to the area of the opposing surface in each of the divided regions.
6. The apparatus for producing a glass molding according to claim 1 or 2,
the recess has a plurality of linear recesses arranged in a lattice.
7. The apparatus for producing a glass molding according to claim 3,
the recess has a plurality of linear recesses arranged in a lattice.
8. The apparatus for producing a glass molding according to claim 4,
the recess has a plurality of linear recesses arranged in a lattice.
9. The apparatus for producing a glass molding according to claim 1 or 2,
the opposed surface is circular, and the recessed portion has a plurality of annular recessed portions formed concentrically.
10. The apparatus for producing a glass molding according to claim 3,
the opposed surface is circular, and the recessed portion has a plurality of annular recessed portions formed concentrically.
11. The apparatus for producing a glass molding according to claim 4,
the opposed surface is circular, and the recessed portion has a plurality of annular recessed portions formed concentrically.
12. The apparatus for producing a glass molding according to claim 1 or 2,
the embossing part has a 1 st embossing part and a 2 nd embossing part,
embossing heads are respectively arranged in the 1 st embossing part and the 2 nd embossing part,
the pressing portions that press the molding die and the concave portions that do not contact the molding die are formed on the opposing surfaces of the indenters provided in the 1 st and 2 nd embossing portions.
13. The apparatus for producing a glass molding according to claim 3,
the embossing part has a 1 st embossing part and a 2 nd embossing part,
embossing heads are respectively arranged in the 1 st embossing part and the 2 nd embossing part,
the pressing portions that press the molding die and the concave portions that do not contact the molding die are formed on the opposing surfaces of the indenters provided in the 1 st and 2 nd embossing portions.
14. The apparatus for producing a glass molding according to claim 4,
the embossing part has a 1 st embossing part and a 2 nd embossing part,
embossing heads are respectively arranged in the 1 st embossing part and the 2 nd embossing part,
the pressing portions that press the molding die and the concave portions that do not contact the molding die are formed on the opposing surfaces of the indenters provided in the 1 st and 2 nd embossing portions.
15. The apparatus for producing a glass molding according to claim 5,
the embossing part has a 1 st embossing part and a 2 nd embossing part,
embossing heads are respectively arranged in the 1 st embossing part and the 2 nd embossing part,
the pressing portions that press the molding die and the concave portions that do not contact the molding die are formed on the opposing surfaces of the indenters provided in the 1 st and 2 nd embossing portions.
16. The apparatus for producing a glass molding according to claim 6,
the embossing part has a 1 st embossing part and a 2 nd embossing part,
embossing heads are respectively arranged in the 1 st embossing part and the 2 nd embossing part,
the pressing portions that press the molding die and the concave portions that do not contact the molding die are formed on the opposing surfaces of the indenters provided in the 1 st and 2 nd embossing portions.
17. The apparatus for producing a glass molding according to claim 7,
the embossing part has a 1 st embossing part and a 2 nd embossing part,
embossing heads are respectively arranged in the 1 st embossing part and the 2 nd embossing part,
the pressing portions that press the molding die and the concave portions that do not contact the molding die are formed on the opposing surfaces of the indenters provided in the 1 st and 2 nd embossing portions.
18. The apparatus for producing a glass molding according to claim 8,
the embossing part has a 1 st embossing part and a 2 nd embossing part,
embossing heads are respectively arranged in the 1 st embossing part and the 2 nd embossing part,
the pressing portions that press the molding die and the concave portions that do not contact the molding die are formed on the opposing surfaces of the indenters provided in the 1 st and 2 nd embossing portions.
19. The apparatus for producing a glass molding according to claim 9,
the embossing part has a 1 st embossing part and a 2 nd embossing part,
embossing heads are respectively arranged in the 1 st embossing part and the 2 nd embossing part,
the pressing portions that press the molding die and the concave portions that do not contact the molding die are formed on the opposing surfaces of the indenters provided in the 1 st and 2 nd embossing portions.
20. The apparatus for producing a glass molding according to claim 10,
the embossing part has a 1 st embossing part and a 2 nd embossing part,
embossing heads are respectively arranged in the 1 st embossing part and the 2 nd embossing part,
the pressing portions that press the molding die and the concave portions that do not contact the molding die are formed on the opposing surfaces of the indenters provided in the 1 st and 2 nd embossing portions.
21. The apparatus for producing a glass molding according to claim 11,
the embossing part has a 1 st embossing part and a 2 nd embossing part,
embossing heads are respectively arranged in the 1 st embossing part and the 2 nd embossing part,
the pressing portions that press the molding die and the concave portions that do not contact the molding die are formed on the opposing surfaces of the indenters provided in the 1 st and 2 nd embossing portions.
22. A method for producing a glass molded body by using a glass molded body production device, the glass molded body production device comprising:
a heating unit that heats a molding die in which a glass material is accommodated;
a press molding section having a press head, the press molding section pressing the molding die by the press head to mold the glass material softened by heating;
a cooling unit that cools the molding die; and
a heater provided at least in the heating portion and the molding portion and heating the molding die,
the method for producing the glass molding comprises the following steps:
a heating step of heating the molding die by the heating unit;
a mold pressing step of pressing the molding die after the heating step by the mold pressing head using the mold pressing portion to mold the glass material accommodated therein; and
a cooling step of cooling the molding die after the molding step by the cooling section,
the mold press head has a plurality of pressing portions that are formed on a surface of the mold press head facing the molding die and press the molding die in the molding step, and a recessed portion that does not come into contact with the molding die in the molding step.
23. The method for producing a glass molding according to claim 22,
a plurality of processing sections including the heating section, the molding section, and the cooling section are arranged in series,
and intermittently moving the molding die containing the glass material to the plurality of processing units sequentially at a fixed time, thereby performing a process including the heating step, the pressing step, and the cooling step to press-mold the glass material.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013112732A JP6147571B2 (en) | 2013-05-29 | 2013-05-29 | Glass molded body manufacturing apparatus and glass molded body manufacturing method |
| JP2013-112732 | 2013-05-29 | ||
| PCT/JP2014/063934 WO2014192727A1 (en) | 2013-05-29 | 2014-05-27 | Apparatus for producing glass molded body and method for producing glass molded body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105209398A CN105209398A (en) | 2015-12-30 |
| CN105209398B true CN105209398B (en) | 2018-01-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201480026724.1A Active CN105209398B (en) | 2013-05-29 | 2014-05-27 | The manufacture device of glass forming body and the manufacture method of glass forming body |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6147571B2 (en) |
| CN (1) | CN105209398B (en) |
| WO (1) | WO2014192727A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4915720A (en) * | 1987-09-30 | 1990-04-10 | Hoya Corporation | Method of and apparatus for molding glass articles |
| JP2006111484A (en) * | 2004-10-14 | 2006-04-27 | Olympus Corp | Forming mold for optical device and forming method |
| CN1834046A (en) * | 2005-03-14 | 2006-09-20 | Hoya株式会社 | Moulding forming device,its head and method for making optical element |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5883317B2 (en) * | 2012-03-05 | 2016-03-15 | Hoya株式会社 | Mold press molding apparatus and optical element manufacturing method |
-
2013
- 2013-05-29 JP JP2013112732A patent/JP6147571B2/en not_active Expired - Fee Related
-
2014
- 2014-05-27 CN CN201480026724.1A patent/CN105209398B/en active Active
- 2014-05-27 WO PCT/JP2014/063934 patent/WO2014192727A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4915720A (en) * | 1987-09-30 | 1990-04-10 | Hoya Corporation | Method of and apparatus for molding glass articles |
| JP2006111484A (en) * | 2004-10-14 | 2006-04-27 | Olympus Corp | Forming mold for optical device and forming method |
| CN1834046A (en) * | 2005-03-14 | 2006-09-20 | Hoya株式会社 | Moulding forming device,its head and method for making optical element |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2014192727A1 (en) | 2014-12-04 |
| JP2014231451A (en) | 2014-12-11 |
| JP6147571B2 (en) | 2017-06-14 |
| CN105209398A (en) | 2015-12-30 |
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