WO2009122949A1 - 光学素子の製造方法及び光学素子の製造装置 - Google Patents
光学素子の製造方法及び光学素子の製造装置 Download PDFInfo
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- WO2009122949A1 WO2009122949A1 PCT/JP2009/055735 JP2009055735W WO2009122949A1 WO 2009122949 A1 WO2009122949 A1 WO 2009122949A1 JP 2009055735 W JP2009055735 W JP 2009055735W WO 2009122949 A1 WO2009122949 A1 WO 2009122949A1
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- molten glass
- opening
- optical element
- glass droplet
- manufacturing
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B7/00—Distributors for the molten glass; Means for taking-off charges of molten glass; Producing the gob, e.g. controlling the gob shape, weight or delivery tact
- C03B7/10—Cutting-off or severing the glass flow with the aid of knives or scissors or non-contacting cutting means, e.g. a gas jet; Construction of the blades used
- C03B7/12—Cutting-off or severing a free-hanging glass stream, e.g. by the combination of gravity and surface tension forces
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
- C03B11/06—Construction of plunger or mould
- C03B11/08—Construction of plunger or mould for making solid articles, e.g. lenses
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/10—Forming beads
- C03B19/1005—Forming solid beads
Definitions
- the present invention includes a plate having an opening, collides a primary molten glass droplet with the plate, separates a part thereof, receives a small droplet of secondary molten glass that has passed through the opening with a lower mold, and presses the optical element.
- the present invention relates to an optical element manufacturing method and an optical element manufacturing apparatus.
- glass optical elements have been widely used as lenses for digital cameras, optical pickup lenses for DVDs, camera lenses for mobile phones, coupling lenses for optical communication, and the like.
- a glass molded body produced by press molding a glass material with a molding die has been used frequently.
- molten glass droplets are dropped on a lower mold heated to a predetermined temperature, and the dropped molten glass droplets are pressure-molded by an upper mold facing the lower mold and the lower mold.
- a method for obtaining a glass molded body also referred to as “droplet molding method”
- the present invention has been made in view of the technical problems as described above, and an object of the present invention is to separate a part of a primary molten glass droplet that collides with a plate and passes through an opening of the secondary molten glass.
- the manufacturing conditions for secondary molten glass droplets can be set easily and appropriately to satisfy both appearance quality and optical performance.
- An optical element manufacturing method and a manufacturing apparatus capable of stably manufacturing an optical element are provided.
- the present invention has the following features.
- a lower mold in which a primary molten glass droplet is dropped from a dropping nozzle onto an opening member having an opening, and a part of the primary molten glass droplet that has passed through the opening is disposed directly below the opening member as a secondary molten glass droplet.
- a method for producing an optical element comprising: a molten glass droplet supply step received at a step, and a press molding step of pressing and molding the secondary molten glass droplet dropped onto the lower mold with an upper mold,
- the opening diameter of the opening member is 50% or more and 100% or less of the effective diameter of the optical function surface provided to the lower mold.
- an opening diameter of the opening member is set based on an effective diameter of an optical function surface provided to the lower mold, and is outside of the dropping nozzle that drops the primary molten glass.
- the diameter is set so as to obtain a desired primary molten glass droplet mass, and the desired primary molten glass droplet mass is set so as to obtain a desired secondary molten glass droplet mass.
- optical device wherein the optical element is prototyped based on the manufacturing conditions set by the method according to 5, the quality of the prototyped optical element is checked, and the melting temperature is reset. Device manufacturing method.
- Dropping amount adjustment having an opening for dropping a primary molten glass droplet, and a part of the primary molten glass droplet dropped from the dropping nozzle, allowing it to pass through and dropping as a secondary molten glass droplet
- An opening member as a member, a lower mold that is disposed directly below the opening of the opening member and receives a drop of a secondary molten glass droplet that has passed through the opening, and the secondary melt that is dropped on the lower mold
- An optical element manufacturing apparatus having an upper mold for pressing and molding glass droplets, wherein the opening diameter of the opening member is 50% or more of the effective diameter of the optical functional surface provided to the lower mold 100% or less of the optical element manufacturing apparatus.
- an opening diameter of the opening member is 70% or more and 90% or less of an effective diameter of the optical functional surface provided to the lower mold.
- a primary molten glass droplet collides with a plate to separate a part thereof, and a fine droplet of secondary molten glass that has passed through an opening is dropped onto a lower mold.
- the secondary diameter is set by setting the conditions so that the opening diameter of the plate is 50% or more and 100% or less of the effective diameter of the optical functional surface provided to the lower mold. It is possible to stably produce an optical element that satisfies both the quality of appearance and the optical performance by simply and appropriately setting the manufacturing conditions of molten glass droplets.
- FIG. 1 It is sectional drawing which shows the one part schematic structural example of the manufacturing apparatus for performing the manufacturing method of the optical element of this embodiment.
- A It is sectional drawing which shows the state at the time of a primary molten glass drop colliding with opening of a plate, and the state after (b) the microdrop of secondary molten glass was isolate
- FIG. 4 is a diagram in which a procedure for setting manufacturing conditions based on lens design specifications is added to FIG. It is a flowchart which shows an example of the manufacturing method of the optical element of this embodiment. It is a schematic diagram for demonstrating the state which has isolate
- FIG. 1 is a cross-sectional view illustrating a schematic configuration example of a manufacturing apparatus for performing a method for manufacturing an optical element according to an embodiment of the present invention.
- a manufacturing apparatus for performing a method for manufacturing an optical element according to an embodiment of the present invention.
- an opening member hereinafter simply referred to as a plate
- a dropping amount adjusting member for molten glass droplets of the apparatus
- 35 is a nozzle for dropping a primary molten glass droplet.
- 36 is a primary molten glass.
- a primary molten glass 36 melted at a predetermined temperature in a glass melting furnace (not shown) is supplied to a dropping nozzle 35 (hereinafter simply referred to as a nozzle) and dropped from the tip of the nozzle 35 as shown in the figure.
- 31 is a dropped primary molten glass droplet, and its size (mass, volume) is adjusted by the melting temperature of the primary molten glass 36 and the outer diameter of the tip of the nozzle 35.
- the 10 is a plate, and has an opening 11 penetrating the plate 10.
- the plate 10 is arranged so that the primary molten glass droplet 31 dropped from the nozzle 35 collides toward the center of the opening 11.
- An arm-shaped plate holding member 15 holds the plate 10 at a predetermined position. That is, the opening 11 is positioned so that the center of the opening 11 is directly below the nozzle 35 and directly above the center of the transfer surface of the lower mold described later.
- the primary molten glass droplet 31 dropped from the nozzle 35 collides with the opening 12 of the upper surface 12 of the plate 10 around the opening 11, and a part of the primary molten glass droplet 31 passes through the opening 11 to form a secondary molten glass droplet (hereinafter simply referred to as “single molten glass” It is dropped as an optical functional surface (hereinafter also referred to as a functional surface or a transfer surface) 23 of the lower mold 21 disposed directly under the opening 11 as a microdroplet 32.
- a functional surface or a transfer surface optical functional surface
- the primary molten glass droplet 31 is not directly received by the lower mold 21 (hereinafter simply referred to as the lower mold), but is dropped onto the plate 10, and a part of the primary molten glass droplet 31 is separated by passing through the opening 11. 32 is supplied to the lower mold 21 because it is difficult to make the primary molten glass droplet 31 from the nozzle 35 smaller.
- the size (mass and volume) of the primary molten glass droplet 31 dropped from the nozzle 35 has been adjusted by the melting temperature of the primary molten glass 36 and the outer diameter of the tip of the nozzle 35, but the primary molten glass 36 flows.
- the lower limit is about 200 mg due to the need to ensure a certain nozzle diameter and the spread due to the wetting of the primary molten glass 36 at the tip.
- exchange of the nozzle 35 was required, and the influence on an operation rate or cost was large.
- the plate 10 having the opening 11 as described above, it is possible to easily obtain a microdrop 32 having a size of less than 200 mg, and the size of the microdrop 32 can be easily changed by simply replacing the plate 10. It can be carried out.
- FIG. 2A is a cross-sectional view showing a state when the primary molten glass droplet 31 collides with the opening 11 of the plate 10
- FIG. 2B is a cross-sectional view showing a state after the fine droplet 32 is separated.
- reference numeral 31 denotes a primary molten glass droplet 31 dropped from the nozzle 35.
- FIG. The state where it collided toward the opening 11 of the plate 10 is shown.
- the opening 11 has an inner peripheral surface on the upper surface 12 side having a tapered shape.
- the primary molten glass droplet 31 is received by the tapered inner peripheral surface.
- the opening 11 has a small diameter, a part of the collided primary molten glass droplet 31 passes through the opening 11 and is separated from the primary molten glass droplet 31.
- 32 is a fine droplet of secondary molten glass that passes through the opening 11, is separated from the primary molten glass droplet 31, and is dropped.
- 33 is a surplus glass after the microdroplets 32 are separated, and is cooled and solidified on the upper surface 12 of the plate 10 while entering the inside of the opening 11. The solidified excess glass 33 is removed in preparation for the dropping of the next primary molten glass droplet 31.
- the microdroplets 32 are then dropped onto the heated optical function surface 23 of the lower mold 21, and the shape of the optical function surface 23 is transferred by press molding.
- the size (mass) of the microdroplets 32 is adjusted in advance so as to have an appropriate mass for the optical element to be formed.
- the size of the microdroplet 32 can be adjusted by the inner diameter of the opening 11 (the minimum diameter of the opening 11 and hereinafter referred to as the opening diameter). Since it is not necessary to adjust the nozzle diameter and the melting temperature of the glass, it is possible to minimize the influence on the molding conditions and hence on the quality of the optical element.
- the size (mass) of the microdroplet 32 is not determined only by the inner diameter (minimum diameter) of the opening 11.
- the mass of the primary molten glass droplet is also controlled. There is a need. Accordingly, it is required to appropriately set many parameters such as the outer diameter of the primary molten glass dropping nozzle and the melting temperature or viscosity of the primary molten glass.
- the quality of the optical element finally formed by press-molding the microdroplets 32 must also be taken into consideration. Depending on such condition settings, the optical performance and appearance quality of the manufactured optical element may be greatly affected.
- the adjustment to obtain the mass of the desired microdroplet 32 with the opening diameter of the opening 11 and the setting of these conditions must be performed so that the quality as an optical element can be taken into consideration.
- the manufacturing conditions for obtaining the desired mass of the microdroplets 32 can be easily set, and both the appearance quality and the optical performance can be set. It is possible to stably produce an optical element that can satisfy the above quality.
- FIG. 3 is a relational diagram showing the relationship between the main production conditions and the effect on the size (mass) of the molten glass droplets. With reference to FIG. 3, the dependency between main production conditions and the mass of molten glass droplets will be described.
- the main production conditions include glass melting conditions for melting primary molten glass, dropping nozzle conditions for nozzles for dropping primary molten glass, and plate opening conditions for separating primary molten glass droplets into secondary molten glass droplets. .
- a melting temperature 41 is mainly mentioned.
- the melting temperature 41 affects the viscosity 42 of the molten glass, and the viscosity 42 affects the mass 51 of the primary molten glass droplet dripping from the nozzle. It also affects the mass 52 of the secondary molten glass droplet, which is partially separated by the opening.
- the dripping nozzle conditions include the shape of the nozzle, the inner diameter of the nozzle, the nozzle outer diameter 43 at the tip of the nozzle, and the nozzle outer diameter 43 particularly affects the mass 51 of the primary molten glass droplet. As the nozzle outer diameter 43 increases, the mass 51 of the primary molten glass droplet also increases.
- the plate opening conditions include the plate opening diameter 44 and the distance between the plate and the dropping nozzle, but the influence of the plate opening diameter 44 is particularly large.
- the opening diameter 44 is increased, the mass 52 of the secondary molten glass droplet that the primary molten glass droplet collides and separates also increases.
- the mass of the optical element to be finally formed that is, the lens
- FIG. 4 is a graph conceptually showing the influence of typical production conditions on the quality of a glass molded body. With reference to FIG. 4, the influence which the molten-glass viscosity 42 and plate opening diameter 44 as manufacturing conditions have on the quality of an optical element is demonstrated.
- FIG. 4 shows a plane region composed of a vertical axis indicating the level of molten glass viscosity and a horizontal axis indicating the size of the plate opening diameter divided into several regions.
- Area Va indicates an area where the viscosity is less than the lower limit where a quality problem occurs due to the viscosity of the molten glass being too low. That is, in this region, bubbles and striae are likely to occur, or there is no molding stability and the surface shape is not likely to occur. Moreover, since the cycle time of dripping becomes too early, there also exists a problem that the amount of disposal will also increase.
- the region Vb indicates a region where the viscosity is higher than the upper limit where a problem in quality occurs due to the viscosity of the molten glass being too high. That is, in this region, devitrification of the glass may occur, or the primary molten glass droplet may be too hard and the fine droplet (secondary molten glass droplet) may not be separated (cannot pass through the opening). There is also a problem that the cycle time becomes too long and the productivity is lowered.
- the area Ma is an area where the plate opening diameter is small, the viscosity is high, and the mass of the microdroplet (secondary molten glass droplet) becomes too small, resulting in a quality problem. Show. That is, in this region, bubbles may be generated during separation, or the primary molten glass droplet may not be separated into fine droplets (cannot pass through an opening that is too small).
- the region Mb is a region where the plate opening diameter is large, the viscosity is low, and the mass of the microdroplet (secondary molten glass droplet) becomes too large, resulting in quality problems. Show. That is, in this region, it is possible that a bulge (air pocket) is generated, the excess glass that protrudes hits the edge, cracks occur, or the primary molten glass droplet is not separated into fine droplets and passes through the opening as it is.
- the upper and lower limits of the viscosity of the molten glass and the upper and lower limits of the mass of the fine droplets define four regions having quality problems, and the central region (blank portion) surrounded by these four regions (hatched portion) is the quality. This is a desirable region.
- the manufacturing conditions are set so as to fall within this desirable region for quality.
- the upper limit of the viscosity is preferably 2 Pa ⁇ s, and the lower limit is preferably 0.1 Pa ⁇ s.
- FIG. 4 is a graph conceptually showing a trend, and setting of manufacturing conditions is not so easy. It is not clear that more parameters are involved, and it is more efficient and reliable to set conditions by setting which priority and in what procedure.
- FIG. 5 is a flowchart showing a schematic procedure for setting manufacturing conditions based on lens design specifications.
- FIG. 6 is a diagram in which a procedure for setting manufacturing conditions based on the lens design specifications is added to FIG. With reference to FIG.5 and FIG.6, the outline procedure of the setting method of the manufacturing conditions which concerns on this embodiment is demonstrated.
- step S11 design specifications (lens mass m ′, lens effective diameter ⁇ , etc.) of the optical element (lens) are determined, and a desired mass m of the secondary molten glass droplet is determined.
- the lens design specifications are indicated by a lens mass 54, a lens effective diameter 55, a glass type 53, and the like.
- the mass 52 of the secondary molten glass droplet is set based on the lens mass 54.
- step S12 of FIG. 5 the desired mass M of the primary molten glass droplet is set so that the desired mass m of the secondary molten glass droplet is obtained.
- the setting method is obtained, for example, by multiplying a separately determined coefficient ⁇ by a desired mass m of the secondary molten glass droplet.
- the mass 51 of the primary molten glass droplet is set from the mass 52 of the secondary molten glass droplet, as indicated by the broken line arrow in S ⁇ b> 12.
- step S13 of FIG. 5 the nozzle outer diameter R of the dropping nozzle is set so that a desired mass M of the primary molten glass droplet is obtained.
- the nozzle outer diameter 43 is set from the mass 51 of the primary molten glass droplet, as indicated by the dashed arrow in S ⁇ b> 13.
- step S14 of FIG. 5 the melting temperature 41 of the molten glass flowing out from the nozzle is set based on the desired mass M of the primary molten glass droplet as in step S13.
- This step S14 may be performed in parallel with the step S13 in coordination with each other.
- the melting temperature 41 is set from the glass type 53 and the mass 51 of the primary molten glass droplet, as indicated by the dashed arrow in S ⁇ b> 14.
- step S15 in FIG. 5 the plate is determined based on the lens effective diameter ⁇ , which is the lens design specification, independently of the manufacturing condition setting related to the dropping nozzle in steps S12 to S14, that is, the mass of the primary molten glass droplet.
- the opening diameter d is set.
- the aperture diameter 44 of the plate is set from the lens effective diameter 55.
- each manufacturing condition setting is made into a flow, and in particular, the setting of the plate opening diameter is made independent of other manufacturing condition settings, and priority is given, so that the manufacturing condition setting can be easily and reliably performed.
- readjustment of settings by quality confirmation is performed in the subsequent steps.
- the effectiveness of setting the aperture diameter based on the effective lens diameter will be described later with reference to an embodiment.
- next step S16 a certain amount of optical elements are prototyped based on the set manufacturing conditions, and the quality is checked.
- the manufacturing process of the optical element will be described later.
- the quality to be checked includes optical performance and appearance in addition to the mass of the optical element.
- next step S17 it is determined whether there is a problem with the checked quality. If it is determined that there is no problem, the process proceeds to the next step S18, the manufacturing conditions are determined, and the process is completed. After that, it will go live based on the set manufacturing conditions.
- step S17 If it is determined in step S17 that there is a problem with the checked quality, the process proceeds to step S19 to reset the melting conditions and the like.
- the melting temperature 41 is reset based on the opening diameter 44 and the resulting mass 52 of the secondary molten glass droplet, as indicated by the dashed arrow in S ⁇ b> 19.
- step S16 the melting temperature that is basically easy to adjust may be reset. Since adjustment may be made so that there is no problem in the viscosity and the mass of the molten glass droplet, the procedure may be repeated from step S16 after adjustment in step S14.
- FIG. 7 is a flowchart showing an example of an optical element manufacturing method according to an embodiment of the present invention.
- 8 and 9 are schematic diagrams for explaining the manufacturing process of the optical element.
- FIG. 9 shows a state where the microdroplets 32 are separated by the plate 10 (step S24), and FIG. The state (step S26) in which the microdroplets 32 are pressure-molded by the upper mold 22 and the upper mold 22 is shown.
- the upper mold 22 for pressure-molding the microdroplets 32 together with the lower mold 21 is configured to be heated to a predetermined temperature by a heating means (not shown), similarly to the lower mold 21. It is preferable that the temperature of the lower mold 21 and the upper mold 22 can be controlled independently.
- the lower mold 21 is moved by a driving means (not shown) to receive a microdrop 32 below the plate 10 (dropping position P1), and a position (pressurization) for pressure molding opposite to the upper mold 22. It is configured to be movable between the pressure position P2). Further, the upper mold 22 is configured to be movable in a direction (vertical direction in the figure) for pressurizing the microdroplets 32 with the lower mold 21 by a driving means (not shown).
- the lower mold 21 and the upper mold 22 are heated to a predetermined temperature (step S21).
- the predetermined temperature may be appropriately selected as a temperature at which a good transfer surface can be formed on the optical element by pressure molding.
- the heating temperatures of the lower mold 21 and the upper mold 22 may be the same or different.
- step S22 the lower mold is moved to a dropping position (position P1 shown in FIG. 9) (step S22).
- the primary molten glass droplet 31 is dropped from the nozzle 35 (step S23).
- the primary molten glass droplet 31 is dropped as follows.
- a primary molten glass 36 heated in a melting furnace (not shown) is supplied to the nozzle 35, and when the nozzle 35 is heated to a predetermined temperature set in this state, the flow path in which the primary molten glass 36 is provided inside the nozzle 35 by its own weight. And accumulates at the tip due to surface tension. When a certain amount of molten glass accumulates, it naturally separates from the tip of the nozzle 35, and a set fixed mass of primary molten glass droplet 31 drops downward.
- the mass of the primary molten glass droplet 31 to be dropped has been set, but can be adjusted by the outer diameter of the tip of the nozzle 35. Further, the dropping interval of the primary molten glass droplets 31 can be adjusted by the inner diameter, length, heating temperature, etc. of the nozzle 35. The procedure for setting these conditions appropriately has already been described. With these settings, it is possible to drop the primary molten glass droplets 31 having a desired mass at desired intervals.
- the mass of the primary molten glass droplet 31 dropped from the nozzle 35 is larger than the desired microdroplet 32 and is set to a size that allows the microdroplet 32 to be separated by colliding with the opening 11 of the plate 10.
- the microdroplets 32 are separated by the plate 10 and supplied to the lower mold 21 (step S24).
- the primary molten glass droplet 31 collides with the upper surface 12 of the plate 10 a part of the primary molten glass droplet 31 passes through the opening 11 having the set opening diameter by the impact, and the micro droplet 32 (secondary molten glass) and become separated.
- the temperature of the primary molten glass droplet 31 when colliding with the plate 10 is set to a temperature at which the viscosity becomes low enough to separate the microdroplets 32 by impact.
- steps S23 and S24 are a molten glass droplet supply step.
- step S25 the lower die 21 is moved to the pressurization position P2 (step S25), the upper die 22 is moved downward, and the lower droplet 21 and the upper die 22 are subjected to pressure molding (step S26). .
- microdroplets 32 dropped (supplied) on the lower mold 21 are cooled and solidified by heat radiation from the contact surface with the lower mold 21 and the upper mold 22 during pressure molding. After cooling to a temperature at which the shape of the transfer surface formed on the glass molded body 34 does not collapse even if the pressure is released, the pressure is released.
- steps S25 and S26 are press forming steps.
- step S27 the upper mold 22 is retracted to recover the optical element 34
- step S28 the surplus glass 33 left on the plate 10 is discarded
- step S22 the lower mold 21 is moved again to the dropping position P1 (step S22), and the steps S23 to S28 are repeated.
- the manufacturing method of the optical element of this invention may include another process other than having demonstrated here. For example, a step of inspecting the shape of the optical element before collecting the optical element, a step of cleaning the lower mold 21 and the upper mold 22 after collecting the optical element, and the like may be provided.
- the optical element manufactured by the manufacturing method of the present invention can be used as various optical elements such as an imaging lens such as a digital camera, an optical pickup lens such as a DVD, and a coupling lens for optical communication.
- the lens design is a biconvex aspherical lens with an outer diameter of ⁇ 5, an effective diameter of ⁇ 3.8, and a lens mass of 75 mg.
- the glass material was SK57.
- the upper mold and the lower mold were each processed into a predetermined aspheric shape according to the above design.
- the desired mass of the fine droplets of the secondary molten glass to be press-molded was 80 mg, and the mass of the primary molten glass droplets for obtaining the fine droplets was set to 400 mg.
- a Pt dropping nozzle having an outer diameter of ⁇ 8 was used.
- the glass melting temperature is adjusted around 1100 ° C. in order to obtain microdroplets with a desired mass.
- Table 1 shows the ratio of the plate opening diameter and the lens effective diameter in Examples 1 to 6 and Comparative Examples 1 and 2. In addition, the melting temperature and the quality evaluation result of the molded optical element are also shown.
- the opening diameters are set in six ways from ⁇ 1.9 to ⁇ 3.8 (ratio to effective diameter ⁇ 3.8 is 50% to 100%). Is set to ⁇ 1.7 and ⁇ 4 (ratio to effective diameter ⁇ 3.8 is 45% and 105%).
- the mass of the fine droplets of the secondary molten glass obtained varies depending on the opening diameter setting. In order to adjust it, the primary glass melting temperature was changed. The results are also shown in Table 1.
- microelements dropped on the lower mold under the above conditions were pressurized with the upper mold and press molded to produce an optical element.
- a certain amount of optical elements were prototyped for each example and comparative example, and quality evaluation was performed.
- Quality evaluation was based on rank evaluation of appearance quality (particularly the rate of occurrence of air pockets called navel) and optical performance (particularly surface accuracy) with ⁇ ⁇ ⁇ . ⁇ is particularly good, ⁇ is within the allowable range, and x indicates unacceptable quality. The evaluation results are also shown in Table 1.
- Examples 1 to 6 are all within the allowable range although there is a difference in the evaluation according to the aperture diameter setting in both appearance quality and optical performance. Comparative Example 1 and Comparative Example 2 show “x”, that is, unacceptable quality, in either appearance quality or optical performance.
- Example 3 and Example 4 show ⁇ in both appearance quality and optical performance, that is, particularly good results. Therefore, it can be seen that a particularly good result is obtained and preferable when the ratio of the aperture diameter to the lens effective diameter is set to 70% or more and 90% or less.
- each manufacturing condition setting is made into a procedure, and in particular, the setting of the plate opening diameter is made independent of the other manufacturing condition settings and has priority, so that the manufacturing condition setting can be easily and reliably performed.
- the primary molten glass droplet collides with the plate to separate a part thereof, and the fine droplet of the secondary molten glass that has passed through the opening is dropped on the lower mold.
- secondary melting is performed by setting conditions so that the opening diameter of the plate is 50% or more and 100% or less of the effective diameter of the optical functional surface provided to the lower mold. It is possible to stably produce an optical element that satisfies both the quality of appearance and the optical performance by simply and appropriately setting the production conditions of glass droplets.
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Abstract
Description
11 開口
12 (プレートの)上面
15 プレート保持部材
21 下型
22 上型
23 光学機能面(転写面)
31 一次溶融ガラス滴
32 (二次溶融ガラスの)微小滴
33 余剰ガラス
34 光学素子
35 ノズル
36 一次溶融ガラス
41 溶融温度
42 粘度
43 ノズル外径
44 開口径
51 一次溶融ガラス滴の質量
52 二次溶融ガラス滴の質量
53 ガラス種類
54 レンズ質量
55 レンズ有効径
図1は、本発明の実施形態に係る光学素子の製造方法を実行するための製造装置の概略構成例を示す断面図である。図1を参照しながら、本実施形態に係る光学素子の製造方法及び製造装置の構成と、本装置の有する溶融ガラス滴の滴下量調整部材としての開口部材(以下、単にプレートという)の機能とを説明する。
図3は、主な製造条件とその溶融ガラス滴の大きさ(質量)に与える影響の関係を示す関係図である。図3を参照して、主な製造条件と溶融ガラス滴の質量との依存関係を説明する。
図5は、レンズ設計仕様に基づいて製造条件を設定する概略の手順を示すフローチャートである。図6は、図4にレンズ設計仕様に基づいて製造条件を設定していく手順を追記した図である。図5及び図6を参照して、本実施形態に係る製造条件の設定方法の概略手順を説明する。
本発明の実施形態に係る光学素子の製造方法について図7~図9を参照しながら説明する。
上述してきたような装置、方法を用いて光学素子の製造を試みた。
Claims (8)
- 滴下ノズルから一次溶融ガラス滴を、開口を有する開口部材に滴下し、該開口を通過した前記一次溶融ガラス滴の一部を二次溶融ガラス滴として前記開口部材の直下に配置された下金型で受ける溶融ガラス滴供給工程と、
前記下金型上に滴下した前記二次溶融ガラス滴を上金型でプレスし、成形するプレス成形工程と、を有する光学素子の製造方法であって、
前記開口部材の開口径は、前記下金型に付与された光学機能面の有効径の50%以上、100%以下である
ことを特徴とする光学素子の製造方法。 - 前記開口部材の開口径は、前記下金型に付与された光学機能面の有効径の70%以上、90%以下である
ことを特徴とする請求の範囲第1項に記載の光学素子の製造方法。 - 前記一次溶融ガラス滴の粘度は、0.1Pa・s以上、2Pa・s以下である
ことを特徴とする請求の範囲第1項または第2項に記載の光学素子の製造方法。 - 請求の範囲第3項に記載の光学素子の製造方法において、
前記開口部材の開口径は、前記下金型に付与された光学機能面の有効径に基づき設定され、
前記一次溶融ガラスを滴下する前記滴下ノズルの外径は、所望の一次溶融ガラス滴の質量が得られるように設定され、
該所望の一次溶融ガラス滴の質量は、所望の二次溶融ガラス滴の質量が得られるように設定される
ことを特徴とする光学素子の製造方法。 - 前記一次溶融ガラス滴の溶融温度は、前記所望の一次溶融ガラス滴の質量に基づき設定される
ことを特徴とする請求の範囲第4項に記載の光学素子の製造方法。 - 請求の範囲第5項に記載の方法により設定された製造条件に基づいて光学素子の試作を行い、試作された光学素子の品質をチェックして前記溶融温度を再設定することを特徴とする、請求の範囲第5項に記載の光学素子の製造方法。
- 一次溶融ガラス滴を滴下する滴下ノズルと、
前記滴下ノズルから滴下された一次溶融ガラス滴の一部を分離して、通過させ、二次溶融ガラス滴として滴下するための開口を有する、滴下量調整部材としての開口部材と、
前記開口部材の開口の直下に配置され、前記開口を通過した二次溶融ガラス滴の滴下を受ける下金型と、
前記下金型上に滴下された前記二次溶融ガラス滴をプレスし、成形する上金型と、
を有する光学素子の製造装置であって、
前記開口部材の開口径は、前記下金型に付与された光学機能面の有効径の50%以上、100%以下である
ことを特徴とする光学素子の製造装置。 - 前記開口部材の開口径は、前記下金型に付与された光学機能面の有効径の70%以上、90%以下であることを特徴とする請求の範囲第7項に記載の光学素子の製造装置。
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CN104860509A (zh) * | 2015-06-15 | 2015-08-26 | 成都光明光电有限责任公司 | 高均匀性光学玻璃的生产制造方法 |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2003292327A (ja) * | 2002-04-01 | 2003-10-15 | Minolta Co Ltd | 光学素子の製造方法 |
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JP2003292327A (ja) * | 2002-04-01 | 2003-10-15 | Minolta Co Ltd | 光学素子の製造方法 |
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US9309141B2 (en) | 2010-09-16 | 2016-04-12 | Konica Minolta Advanced Layers, Inc. | Method of manufacturing optical element and optical element |
CN104860509A (zh) * | 2015-06-15 | 2015-08-26 | 成都光明光电有限责任公司 | 高均匀性光学玻璃的生产制造方法 |
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