TW202323208A - Glass molded body and method for producing same - Google Patents

Abstract

The purpose of the present invention is to provide: a glass molded body useful for manufacturing an optical element; and a method for manufacturing the glass molded body. Provided is a glass molded body comprising glass having a liquidus temperature and a viscosity at the liquidus temperature of 5*103 dPa.s or less, the glass molded body having any one of a cylindrical shape, a regular n-prism shape and a substantially regular n-prism shape, the area of a cross-section perpendicular to the side surface being 1.0*103 mm2 or more, and the thickness of the glass molded body being 1-10 [mu] m. The texture of the glass is measured according to the Japanese optical glass industrial association standard JOGIS11-1975, and the texture of the glass is 1-3 grade.

Description

Formed glass body and manufacturing method thereof

The present invention relates to a glass forming body and a method for producing the same.

In the past, as one of the methods of manufacturing optical glass lenses, first, after forming a sheet glass without texture, it is cut, and the cut glass sheet is press-formed and polished to obtain an optical glass lens. However, this method has a problem in that a large amount of glass is discarded at the stage of obtaining glass flakes. As a method of reducing such glass waste, for example, optical glass is formed into a cylindrical shape instead of a plate shape, and then cut.

As a method of forming cylindrical glass, Patent Document 1 and Patent Document 2 disclose a method in which molten glass is directly poured into a cylindrical mold and formed. In these documents, it is disclosed that cylindrical glass having an outer diameter of 20 to 30 mm is obtained.

In addition, as a manufacturing method for molding optical glass having a relatively large volume, Patent Document 3 discloses a method in which molten glass is poured into a mold with an unclosed top and molded into a width of 200 mm to 240 mm and a thickness of 10 mm to 15 mm. sheet glass. [Prior art literature] [Patent Document]

Patent Document 1: Japanese Patent Laid-Open No. 2005-089275; Patent Document 2: Japanese Patent Application Laid-Open No. 2006-052109; Patent Document 3: Japanese Unexamined Patent Publication No. 2012-001391. [Problem to be solved by the invention]

However, in recent years, optical glass is also used in thin plate-shaped elements such as light guide plates used in goggle-type displays. The length of one side of such a thin plate-shaped glass element such as a light guide plate is required to be at least longer than the interpupillary distance of a human being, and a large-sized glass element is required. When mass-producing such thin-plate optical glass elements, a disk-shaped wafer made of optical glass is processed into more than one element by dicing or the like like a semiconductor element production line, but the wafer is It is manufactured by slicing a cylindrical glass equivalent to an ingot when manufacturing semiconductor devices, or digging out of a glass sheet. Therefore, the optical glass corresponding to the wafer is required to be a thin plate glass with a long side and a predetermined area. In addition, as a method of efficiently manufacturing optical elements such as a plurality of lenses, there is a method in which, as shown in FIG. Pressing, the pressed glass 201 is produced, a plurality of lenses are produced, stacked and cut, thereby producing an optical element 401 having a plurality of lenses. From the viewpoint of efficiency, or in order to reduce waste glass, it is preferable to remove a large number of optical glass elements from the glass parts in the form of a larger disk in such a way. Therefore, it is desired to manufacture cylindrical glass with a large cross-sectional area from which a plurality of large disk-shaped glasses can be taken out.

However, the columnar glass of Patent Documents 1 and 2 does not have a sufficient cross-sectional area, and a formed glass body having a larger diameter is preferable. In addition, the shape of the sheet glass in Patent Document 3 is not suitable for obtaining an optical glass element for a light guide plate.

An object of the present invention is to provide a glass molded body useful for manufacturing optical elements and a method for manufacturing the same. [Scheme for solving the problem]

That is, the present invention includes the present invention by the following production methods. [1] A method of manufacturing a glass molded body from three-dimensional glass, comprising: arranging the three-dimensional glass in the mold so as to be in contact with the bottom of the mold; heating the three-dimensional glass together with the mold, The step of raising the temperature of the three-dimensional glass in the heating furnace to a forming temperature and maintaining the forming temperature, wherein the forming temperature is above the temperature at which the three-dimensional glass deforms due to its own weight and is less than the temperature of crystallization temperature; using the forming temperature to deform the three-dimensional glass to form a glass forming body having a shape corresponding to the inner shape of the mold; and after cooling, taking out the mold to obtain the glass forming body step. [2] A method of manufacturing a glass molded body from three-dimensional glass, comprising: a step of arranging the three-dimensional glass on a base; the three-dimensional glass, so that the end part is in contact with the base; in the state covered with the cylinder, the three-dimensional glass is heated to raise the temperature of the three-dimensional glass in the heating furnace to a forming temperature, the step of maintaining the forming temperature, wherein the forming temperature is above the temperature at which the three-dimensional glass is deformed due to its own weight and lower than the crystallization temperature; using the forming temperature to deform the three-dimensional glass to form a a step of forming a glass molded body having a shape corresponding to the inner shape of the cylinder; and a step of taking out the glass molded body from the cylinder after cooling to obtain the glass molded body. [3] The manufacturing method according to [1] or [2], wherein the three-dimensional glass is deformed by its own weight. [4] The production method according to [1] or [2], wherein the glass forming body has a cylindrical shape. [5] A method for producing sheet glass, comprising producing a glass molded body by the method described in [1] or [2], and slicing the glass molded body into a thin plate shape. [6] A glass forming body, which has a liquidus temperature and a viscosity at the liquidus temperature of 5 × 103dPa. s or less glass, and has any shape of cylinder, regular n-angular prism and approximately regular n-angular prism, the area of the cross-section perpendicular to the side is 1.0×10 ³ mm ² or more, n is an integer of 5 or more, according to Japan The optical glass industry association standard JOGIS11-1975 measures the texture as a glass composition of grade 1 to grade 3. [7] The glass molded article according to [6], wherein the length from one end of the shape to the other end of the shape is 2 cm or more. [8] A method for producing sheet glass, comprising slicing the formed glass body described in [6] or [7] and processing it into a thin plate shape. [9] A method for producing an optical element, comprising forming one or more optical elements from the sheet glass obtained by the method described in [8]. [Invention effect]

The glass molded article of the present invention is, for example, a glass molded article made of glass having predetermined properties produced by the production method of the present invention. Although the viscosity at the liquidus temperature is 5×10 ³ dPa. glass with low viscosity below s, but due to the low degree of texture and a cross-sectional area of 1.0×10 ³ mm ² or more, a glass shaped body in any of the shape of a cylinder, a regular n-angle prism, and a substantially positive n-angle prism ( However, n is an integer of 5 or more), and therefore optical glass having desired characteristics in a desired shape can be efficiently extracted from the glass molded body. Moreover, according to the manufacturing method of the glass molding of this invention, even if it is glass with a low viscosity, the glass molding which has a large cross-sectional area can be manufactured without generating a texture.

[Glass forming body] The glass forming body of the present invention has a liquidus temperature and a viscosity at the liquidus temperature of 5×10 ³ dPa. s or less, and the glass forming body has any one of a cylindrical shape, a regular n-angle prism, and a substantially regular n-angle prism, the area of the cross-section perpendicular to the side is 1.0×10 ³ mm ² or more, and n is an integer of 5 or more , composed of glass with a texture of grade 1 to grade 3 measured in accordance with the Japan Optical Glass Industry Association standard JOGIS11-1975.

The shaped glass article of the present invention is characterized in that it is any one of a cylinder, a regular n-angle prism, and a substantially regular n-angle prism (where n is an integer of 5 or more), and the area of the cross section perpendicular to the side is 1.0×10 ^{3 mm2} or more. Here, the cylindrical shape includes not only a rod shape with a circular cross section perpendicular to the side surface, but also a disk shape (with a short distance between both ends). In addition, the positive n-angle prism shape and the approximately positive n-angle prism shape include, in addition to the regular n-gon and approximately regular n-gon rods in cross-section perpendicular to the sides, the regular n-gon disc shape (between the two ends). The distance is shorter than the diameter of the circumscribed circle of the regular n-gon), roughly regular n-gon disc shape (the distance between the two ends is smaller than that on the circumference or in the circle containing all the vertices of the above-mentioned roughly regular n-gon The diameter of the hypothetical circle is shorter). The side surface of the prism-shaped glass molding can be processed by grinding, polishing, etc., to produce cylindrical glass. If the cross-section perpendicular to the side surfaces of the prism shape is a regular n-gon or substantially regular n-gon (n is 5 or more), the amount of glass to be removed can be reduced when producing cylindrical glass. Fig. 5 shows the ratio of the volume of the cylindrical glass to the volume of the regular n-pillar-shaped glass forming body (volume of cylindrical glass/normal The volume of the n-corner columnar glass forming body). If the ratio is called the yield of cylindrical glass, when n=4, the yield is less than 80%, but when n is 5 or more, the yield increases remarkably. n is preferably 6 or more, more preferably 7 or more, further preferably 8 or more, still more preferably 9 or more, still more preferably 10 or more. The formed glass article of the present invention can be obtained, for example, by the method for producing a formed glass article of the present invention. The cross-sectional area perpendicular to the side surface is preferably at least 2.0×10 ³ mm ² , more preferably at least 2.5×10 ⁴ mm ² , especially Preferably, it is 3.0×10 ⁴ mm ² or more. This is because a desired optical glass element can be efficiently obtained as the cross-sectional area is larger.

The glass constituting the glass forming article of the present invention has a liquidus temperature (a liquidus temperature exists). Here, the liquidus temperature means the lowest temperature at which a crystalline solid does not form from a molten glass when a certain temperature is maintained for a fixed time. That is, the glass forming body of the present invention has a viscosity exceeding 5×10 ³ dPa. The highly viscous region of s does not precipitate an extremely stable glass of crystalline solids.

The viscosity of the glass forming body of the present invention at the liquidus temperature is 5×10 ³ dPa. below s. The viscosity at liquidus temperature is 5×10 ³ dPa. s or less, glass with low viscosity near the forming temperature (near the temperature of forming molten glass) is an object. As long as it is such glass, it does not take a lot of time to manufacture the glass molded article of the present invention. The viscosity of the glass forming body of the present invention at the liquidus temperature is preferably 1×10 ³ dPa. s or less, more preferably 1×10 ² dPa. below s.

The glass molded article of the present invention is composed of glass whose texture is grade 1 to 3 as measured in accordance with Japan Optical Glass Industry Association Standard JOGIS11-1975. Generally, the viscosity at liquidus temperature is 5×10 ³ dPa. It is difficult to directly produce a glass molded body having a large cross-sectional area from a glass molten state with a glass of s or less (glass with low viscosity). The reason for this is considered to be that when the glass with low viscosity is molded, after the glass is poured (after the molten glass is poured into the molding mold), the glass surface has a low temperature glass part (the glass near the surface where the temperature drops first) The inside of the glass which is still hot is immersed, so the glass tends to become uneven. However, the glass molded article of the present invention is formed by deforming a three-dimensional glass with a texture of grades 1 to 3 by heating, so the viscosity is 5×10 ³ dPa even at the liquidus temperature. s or less glass, a glass molded article with a large cross-sectional area can be obtained. Here, the three-dimensional glass is hardened glass having a shape that can be arranged inside a mold, preferably having a flat and/or convexly curved surface. In addition, when forming glass moldings, glass is molded in a high-viscosity state, so new textures are not easily generated, so even glass moldings with large cross-sectional areas can obtain textures of grades 1 to 3. Here, the texture refers to a portion having uneven optical properties such as a refractive index. In addition, the glass forming article of the present invention is preferably a glass forming article having a texture of grade 1 or grade 2, more preferably a glass molding article having a texture of grade 1.

The length from one end to the other end of the formed glass article of the present invention is not limited, and is, for example, 2 cm or more, preferably 5 cm or more, more preferably 10 cm or more. Here, the length from one end to the other end of the glass forming body corresponds to the height in the case of cylindrical glass, and corresponds to the thickness in the case of disc-shaped glass, for example.

[Manufacturing method of glass molding] (implementation mode 1) Embodiment 1 of the manufacturing method of the glass molding of this invention is as follows. Right now; A method for manufacturing a glass molded body from three-dimensional glass, comprising: a step of disposing the three-dimensional glass on the mold so as to be in contact with the bottom of the mold; heating the three-dimensional glass together with the mold to make the three-dimensional glass The temperature of the three-dimensional glass in the heating furnace is raised to the forming temperature, and the step of maintaining the forming temperature, wherein the forming temperature is above the temperature at which the three-dimensional glass deforms due to its own weight and is lower than the crystallization temperature; a step of deforming the glass at the forming temperature to form a glass molded body having a shape corresponding to the inner shape of the mold; and a step of taking out the glass molded body from the mold after cooling to obtain the glass molded body. In this embodiment, a step of supporting the three-dimensional glass and a step of putting the three-dimensional glass together with the mold into a heating furnace while supporting the three-dimensional glass may be added. Hereinafter, it demonstrates in detail using FIG. 2. FIG. It should be noted that, in Embodiment 1 and Embodiment 2 described later, although a cylindrical shaped glass molded body was produced, the glass molded body obtained by this production method is not limited to a cylindrical shape, and glass molded bodies of various shapes can be produced. , For example, a glass molded body whose cross-section perpendicular to the side surface is a circle, ellipse, triangle, quadrangle, polygon greater than or equal to pentagon, regular triangle, square, or regular polygon greater than or equal to regular pentagon. Therefore, examples of the three-dimensional shape of the glass molded article obtained in Embodiment 1 and Embodiment 2 include a cylindrical shape, a prism shape, and the like.

First, the three-dimensional glass 1 is placed on the inner bottom surface 32 of the mold 3 having a concave portion. The three-dimensional glass 1 may be cylindrical or glass of other shapes besides the rectangular parallelepiped glass whose cross section is shown in FIG. 2 . In this way, the surface of the preferred three-dimensional glass is a plane and/or a convex curved surface. If there are cavities in the three-dimensional glass or three-dimensional glass with recesses deeper than the diameter of the opening on the surface, the surface of the three-dimensional glass (including the surface inside the glass surrounding the cavity) remains inside the glass forming body, resulting in glass The optical uniformity of the molded body decreases. Therefore, it is not preferable to use three-dimensional glass having cavities or three-dimensional glass having recesses deeper than the diameter of the opening on the surface. The three-dimensional glass 1 is solid glass. In the arrangement method, the long sides of the three-dimensional glass 1 are arranged perpendicular to the bottom surface 32 of the mold 3 . The cross-sectional area of the three-dimensional glass 1 is made smaller than the cross-sectional area of the internal shape 31 of the mold 3 (the area of the internal shape of the plane parallel to the bottom surface 32 ). This is because it needs to be arranged so as to be in contact with the bottom surface 32 .

The mold 3 has an inner shape 31 corresponding to the shape of the glass forming body 21 . That is, the internal shape 31 is the shape of the concave portion of the mold 3 . In order to obtain a glass forming body 21 with a large diameter, in FIG. 2 , it is a mold 3 having an inner shape 31 (that is, a cylindrical shape) corresponding to the shape. In order to prevent the glass from overflowing from the mold 3 , the volume of the inner shape 31 of the mold 3 (volume of the mold) is made larger than the volumes of the three-dimensional glass 1 and the glass molded body 21 . The material of the mold 3 is not particularly limited as long as it has fire resistance, and examples thereof include ceramics, diatomaceous earth, and the like.

When the material of the three-dimensional glass 1 has a small cross-sectional area and the glass molded body 21 has a large volume, the long sides of the three-dimensional glass 1 need to be extremely long relative to the cross-section. In this case, as shown in FIG. 2, the three-dimensional glass 1 can be pressed using the support 5 so that it may not fall down. In FIG. 2 , the support 5 that supports the three-dimensional glass 1 from above is used, but the method of support is not particularly limited, and a method such as clamping from the side may be used.

Next, as shown in FIG. 2( b ), the three-dimensional glass 1 and the mold 3 (if necessary, the support 5 ) are placed in the heating furnace 4 , and the three-dimensional glass 1 is set to be heated to the forming temperature. The forming temperature is above the temperature at which the three-dimensional glass 1 deforms due to its own weight and below the crystallization temperature. If the temperature of the three-dimensional glass 1 is lower than the deformation temperature due to its own weight, the glass will not be easily deformed, and the three-dimensional glass 1 cannot be deformed into a predetermined shape. Moreover, if it is more than a crystallization temperature, glass will become a molten state with low viscosity, and a texture may generate|occur|produce. In the production method of the present invention, glass is not brought into a low-viscosity molten state. If the glass is brought into a low-viscosity molten state, when an unstable glass is used, the crystallization point of the glass is passed in the subsequent cooling stage, which leads to crystallization in the glass or on the surface of the glass. In the present invention, even if it is an unstable glass that tends to crystallize, it is possible to produce a cylindrical shaped glass molded article having a large cross-sectional area perpendicular to the longitudinal direction without crystallization. In the present invention, the lower limit of the forming temperature is the temperature at which glass deforms due to its own weight. The temperature at which the material deforms due to its own weight substantially refers to the softening point Ts. On a thermal expansion curve, the softening point (Ts) is the temperature at which expansion apparently stops. The softening point Ts is obtained by, for example, JIS R 3103-3 Part 3: Transition temperature measurement method by thermal expansion method. In addition, the cessation of this expansion does not indicate the intrinsic thermal expansion characteristics of the glass, but occurs due to the load applied to the glass sample and deformation due to the self-weight of the glass sample. In the present invention, the preferable lower limit of the molding temperature is a temperature higher than the softening point. In addition, in this specification, a crystallization temperature means the temperature of the maximum value Tc part of an endothermic peak in FIG. 4 which shows the graph of the differential thermal analysis of a general optical glass.

In the heating furnace 4, the three-dimensional glass 1 can be inserted at room temperature, or can be inserted and heated at a certain temperature, or the heating furnace 4 can be raised to a desired temperature in advance, and the three-dimensional glass 1 can be inserted thereinto. .

The three-dimensional glass 1 is inserted into the heating furnace 4, and when the three-dimensional glass 1 reaches the molding temperature, the glass softens. The softened glass expands in the mold 3 due to its own weight, and finally forms the inner shape 31 of the mold 3 . Then, by cooling, a solidified glass molded body 21 having a shape corresponding to the inner shape 31 of the mold 3 is obtained.

The cooling rate is preferably slow cooling so that the obtained glass molded body does not break, but it is not particularly limited, and can be appropriately determined according to the glass composition and shape of the glass molded body 21 .

(Embodiment 2) Embodiment 2 of the manufacturing method of a glass molded object is as follows. Right now; A method for manufacturing a glass molded body from three-dimensional glass, comprising: a step of arranging the three-dimensional glass on a base; For the three-dimensional glass, make the end contact with the base; in the state covered with the cylinder, heat the three-dimensional glass to raise the temperature of the three-dimensional glass in the heating furnace to the forming temperature, and maintain The step of forming temperature, wherein, the forming temperature is above the temperature at which the three-dimensional glass deforms due to its own weight and is lower than the crystallization temperature; the three-dimensional glass is deformed by the forming temperature to form a a step of forming a glass forming body having a shape corresponding to the internal shape of the glass; and a step of taking out the formed glass body from the cylinder after cooling to obtain the forming glass body. In addition, the three-dimensional glass may be placed in a heating furnace together with the base and the cylinder in a state where the cylinder is covered, and the temperature of the three-dimensional glass in the heating furnace is raised to Forming temperature is a step of maintaining the forming temperature, wherein the forming temperature is above the temperature at which the three-dimensional glass deforms due to its own weight and below the crystallization temperature. Hereinafter, it demonstrates in detail using FIG. 3. FIG.

As shown in FIG. 3 , in Embodiment 2, compared with Embodiment 1, the length from one end of the glass forming body to the other end is longer (slender) than the outer diameter of the end surface. case is valid. The difference from Embodiment 1 is that a base such as the tray 6 can be used instead of a mold. In addition, the base does not have to be the tray 6, but may be a fire-resistant plate, or the mold 3 as in the first embodiment may be used. In addition, in Embodiment 2, the bottom surface 61 of the tray 6 is used as a base. In addition, by using the tray 6 as the base, when the glass leaks from the cylinder 7, things other than the device can be prevented from being contaminated.

In Embodiment 2, after the three-dimensional glass 1 is placed on the bottom surface 61 of the tray 6 , the cylinder 7 is placed on the tray 6 so as to be fitted over the three-dimensional glass 1 . In Embodiment 2, the three-dimensional glass 1 standing vertically on the tray 6 is fitted over the tube 7 from the open end of the tube 7 , and the tube 7 is also vertically standing on the tray 6 . The length of the cylinder 7 is preferably longer than the length of the long sides of the three-dimensional glass 1 , but it may be shorter than the length of the long sides of the three-dimensional glass 1 as long as it does not affect the production of the glass molded body 22 . It is also possible to use a supporting body to support as required, so that the cylinder 7 does not fall down.

Since the shape of the glass forming body 22 obtained in Embodiment 2 corresponds to the internal shape of the cylinder 7, the cylinder 7 whose internal shape can obtain a desired glass forming body is selected for the cylinder 7. For example, a tube having an inner diameter of 20 to 180 mm and a length of about 100 to 700 mm can be used as the tube 7 . The material of the cylinder is not particularly limited as long as it has fire resistance, and examples thereof include ceramics, diatomaceous earth, and the like.

Next, the three-dimensional glass 1 , the tray 6 , and the cylinder 7 are arranged in the heating furnace 4 , and are set so that the three-dimensional glass 1 can be heated to the forming temperature. At this time, the three-dimensional glass 1 may be poured on the cylinder 7 inside the cylinder 7 as long as the cylinder 7 is arranged perpendicularly to the bottom surface of the tray 6 . The molding temperature and the temperature setting of the heating furnace 4 are the same as those in Embodiment 1, so they are omitted.

The three-dimensional glass 1 is inserted into the heating furnace 4, and when the three-dimensional glass 1 reaches the molding temperature, the glass softens. The softened glass expands to the inside of the lower part of the tube 7 due to its own weight, and finally takes the shape of the inside of the tube 7 . Then, by cooling, solidified glass having a shape corresponding to the inner shape of the cylinder 7 is obtained. The cooling rate can be appropriately determined in the same manner as in the first embodiment.

In addition, Embodiment 1 and Embodiment 2 all deform the three-dimensional glass 1 by its own weight, but it is not limited thereto. It is also possible to apply pressure to the glass from above with a pressing device, or place a heavy object on the top of the three-dimensional glass to increase the load on the glass. thereby shaping it. [Example]

Hereinafter, the present invention will be further described by way of examples. In addition, this invention is not limited to an Example.

[Production of columnar shaped glass] Prepare glass raw materials and melt them at 900-1450°C depending on the state of the glass, that is, heat and melt the glass raw materials in the range of 1300-1450°C. Annealing is carried out at a temperature of 50°C to 100°C, thereby obtaining 7 types of glass plates 1 to 7 (textures are grades 1 to 3). Table 1 shows the glass transition temperature, melting temperature, liquidus temperature, and holding temperature of Glasses 1 to 7, and Table 2 shows the viscosity, softening point, and crystallization temperature at the liquidus temperature. Here, the glass transition temperature (transition point) Tg is obtained by JIS R 3103-3 Part 3: Transition temperature measurement method by thermal expansion method. The liquidus temperature was obtained as follows. A glass sample with a volume of 10 cm³ consisting of each glass shown in Table 1 is placed in a platinum crucible, and kept in a glass melting furnace set at the melting temperature shown in Table 1 for 20 minutes to fully melt the glass sample to form a molten Then, take the platinum crucible out of the glass melting furnace, place the glass sample in the platinum crucible, and cool the glass sample until the temperature of the glass sample reaches below 500°C. Next, put the above-mentioned platinum crucible in a glass melting furnace set at temperature T[°C] for 2 hours, take it out of the furnace, and immediately (within 8 seconds) place the platinum crucible containing the glass sample at room temperature Cool the glass sample to room temperature on a heat-resistant object (brick, etc.). Here, room temperature refers to a temperature in the range of -10 to 80°C. Then, the surface and inside of the glass sample were visually observed to check whether or not they were crystallized. The above-mentioned experiment was repeated by changing the above-mentioned temperature T by 10° C. within the range of the holding temperature shown in Table 1, and the lowest temperature at which crystallization was not observed on the surface and inside of the glass sample was taken as the liquidus temperature LT. For the viscosity at the liquidus temperature, for example, the liquidus temperature, the temperature 50°C higher than the liquidus temperature, the temperature 100°C higher than the liquidus temperature, and the temperature 150°C higher than the liquidus temperature can be measured using a rotational viscometer, for example. The temperature and the viscosity of each temperature of the glass transition temperature Tg are measured, an approximate curve is derived from the data of 5 points, and the calculation is performed from the approximate curve. The measurement methods of softening point Ts and crystallization temperature are as described above.

[Table 1] glass name Transition point [°C] Melting temperature [°C] Liquidus temperature [°C] Keep temperature[°C] glass 1 520 1000~1200 950 850~1050 glass 2 384 900~1000 600 500~750 glass 3 655 1200~1350 1080 950~1150 glass 4 688 1300~1450 1150 1050~1300 glass 4 709 1300~1450 1190 1100~1350 glass 6 457 900~1000 645 550~800 glass 7 592 1200~1350 1020 900~1200 [Table 2] glass name Viscosity at liquidus temperature [dPa. s] Softening point[℃] Crystallization temperature [°C] glass 1 4.0 559 682±50 glass 2 227.1 427 560±50 glass 3 4.9 707 830±50 glass 4 3.4 736 880 glass 4 3.0 752 900 glass 6 322.1 490 582 glass 7 30.0 640 794

Next, the plate-shaped glasses 1 to 7 are cut to obtain short strip-shaped glasses. The shape of the short bar is a corner column (cuboid) of 25mm×59mm×300mm.

(Examples 1 to 7) Cylindrical (disk-shaped) glasses with a diameter of 150 mm and a height of 25 mm were produced from the obtained strip-shaped glasses 1 to 7 by the method of Embodiment 1 (with support) under the following conditions. The texture is grade 1-3. Mold: ceramic Shape inside the mold: cylindrical shape Internal diameter (bottom surface) of the mold: 150mm The height of the inner shape of the mold: 30mm Forming temperature: softening point (Ts) + 20°C ~ 100°C

(Examples 8 to 14) Using the glasses 1 to 7 shown in Table 1, similarly, short glass 1 to 7 with a diameter of 53 mm and a length of 150 mm were formed based on the following conditions and by the method of Embodiment 2. Cylindrical shaped glass. The texture is graded from 1 to 3. Cylinder: ceramic tube The inner diameter of the barrel: 53mm The length of the barrel: 300mm Forming temperature: softening point (Ts) + 20°C ~ 100°C Base: Tray made of ceramics (the diameter of the bottom surface of the tray is 150mm) In the above example, a cylindrical ceramic tube was used to produce seven cylindrical glasses consisting of glasses 1 to 7. By using regular pentagonal ceramic tubes, regular hexagonal ceramic tubes, and regular octagonal ceramic tubes instead of cylindrical ceramic tubes, it is possible to produce regular pentagonal prism-shaped glass moldings, Regular hexagonal glass moldings, regular octagonal glass moldings. Thus, seven regular pentagonal prism glasses each consisting of glasses 1 to 7, seven regular hexagonal prism glasses each consisting of glasses 1 to 7, and seven regular octagonal prism glasses each consisting of glasses 1 to 7 are produced. . Then, the side surfaces of each of these prism-shaped glasses are processed to produce glass in a cylindrical shape inscribed in the cross-section of the prism. That is, thus, a glass having the same length as the prismatic glass and the thickness (the diameter of the cross-section of a circle) equal or substantially equal to the diameter of the circle inscribed in the cross-section perpendicular to the axis of each prismatic glass is produced from each prismatic glass. Cylindrical glass. In the above example, although a cylindrical ceramic tube was used, it can also be used and manufactured separately. The side surface of each prism-shaped glass is processed, and the glass of the cylindrical shape inscribed with the cross-section of a prism is produced.

(Example 15) Each of the formed glass bodies produced in Examples 1 to 14 was sliced by a known method to produce a plurality of circular thin plate glasses made of various glasses. A plurality of light guide plates for use in a goggle-type display are formed on these thin glass plates by a known method, and each light guide plate is separated by dicing to efficiently manufacture a plurality of light guide plates. No crystals or grains were found in each light guide plate, and it was confirmed that the quality was high. In addition, optical elements other than the light guide plate can also be manufactured using known methods.

(Comparative Example 1) The molten glass from which the glass used in Examples 1 to 14 was obtained was cast into the molding die described in Patent Documents 1 and 2, and a glass with a cross-sectional area of 1.0×10 ³ mm ² was formed. Cylindrical glass. Observation of the obtained glass revealed conspicuous grains, and a glass molded product with grains of grades 1 to 3 could not be obtained.

1: three-dimensional glass 21,22: Glass forming body 3: Mold 31: Inside the mold 32: bottom surface 4: Heating furnace 5: Support body 6: Tray 7: barrel

FIG. 1 is a schematic diagram showing manufacturing steps of a general camera module. FIG. 2 is a diagram showing manufacturing steps related to the manufacturing method according to Embodiment 1 of the present invention. FIG. 3 is a diagram showing manufacturing steps related to a manufacturing method according to Embodiment 2 of the present invention. Fig. 4 is a graph of differential thermal analysis of general optical glass. 5 is a graph showing the relationship of the ratio of the volume of the cylindrical glass to the volume of the regular n-pillar shaped glass article (volume of the cylindrical glass/volume of the regular n-pillar shaped glass article).

1: three-dimensional glass

22: Glass forming body

4: Heating furnace

6: Tray

61: Bottom

7: barrel

Claims (9)

A method for manufacturing a glass forming body from three-dimensional glass, comprising: a step of disposing the three-dimensional glass on the mold so as to be in contact with the bottom of the mold; Heating the three-dimensional glass together with the mold, increasing the temperature of the three-dimensional glass in the heating furnace to a forming temperature, and maintaining the forming temperature, wherein the forming temperature is the result of the three-dimensional glass Above the temperature of deformation due to its own weight and below the crystallization temperature; The step of deforming the three-dimensional glass by the forming temperature to form a glass forming body having a shape corresponding to the inner shape of the mold; and After cooling, the step of taking out the mold to obtain the glass molded article. A method for manufacturing a glass forming body from three-dimensional glass, comprising: a step of disposing the three-dimensional glass on the base; a step of arranging the cylinder in such a way that the cylinder is placed on the disposed three-dimensional glass from the end of the opening so that the end is in contact with the base; In the state covered with the cylinder, heating the three-dimensional glass, raising the temperature of the three-dimensional glass in the heating furnace to a forming temperature, and maintaining the forming temperature, wherein the forming temperature is the Above the temperature at which the three-dimensional glass deforms due to its own weight and below the crystallization temperature; The step of forming the three-dimensional glass into a glass forming body having a shape corresponding to the inner shape of the cylinder by being deformed by the forming temperature; and After cooling, it is taken out from the said cylinder, and the process of obtaining the said glass molded object. The manufacturing method according to claim 1 or 2, wherein, The deformation of the three-dimensional glass is carried out by its own weight. The manufacturing method according to claim 1 or 2, wherein, The glass forming body has a cylindrical shape. A method of manufacturing sheet glass, A glass molded body is produced by the method described in claim 1 or 2, and the glass molded body is sliced and processed into a thin plate shape. A glass forming body, which has a liquidus temperature and a viscosity at the liquidus temperature of 5×10 ³ dPa. s or less, the glass forming body has any one of a cylindrical shape, a regular n-angle prism, and a substantially regular n-angle prism, the area of the cross-section perpendicular to the side surface is 1.0×10 ³ mm ² or more, and n is an integer of 5 or more , is composed of glass with a texture of grade 1 to grade 3 measured in accordance with the Japan Optical Glass Industry Association standard JOGIS11-1975. The glass forming article as described in Claim 6, wherein, The length from one end of the shape to the other end is 2 cm or more. A method of manufacturing sheet glass, The formed glass body according to claim 6 or 7 is sliced and processed into a thin plate shape. A method of manufacturing an optical element, One or more optical elements are formed from sheet glass obtained by the method described in Claim 8.

Images