WO2023135850A1 - レンズ及びその製造方法 - Google Patents

レンズ及びその製造方法 Download PDF

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Publication number
WO2023135850A1
WO2023135850A1 PCT/JP2022/031841 JP2022031841W WO2023135850A1 WO 2023135850 A1 WO2023135850 A1 WO 2023135850A1 JP 2022031841 W JP2022031841 W JP 2022031841W WO 2023135850 A1 WO2023135850 A1 WO 2023135850A1
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WIPO (PCT)
Prior art keywords
core member
mold
gate
lens
protrusion
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/JP2022/031841
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English (en)
French (fr)
Japanese (ja)
Inventor
俊允 高岡
祐 櫻井
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Nalux Co Ltd
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Nalux Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nalux Co Ltd filed Critical Nalux Co Ltd
Priority to JP2022578841A priority Critical patent/JP7366469B1/ja
Priority to CN202280072283.3A priority patent/CN118318186A/zh
Publication of WO2023135850A1 publication Critical patent/WO2023135850A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses

Definitions

  • the present invention relates to a lens and its manufacturing method.
  • a lens configured to easily improve the quality of a molded lens when a core member is held in a mold and only the outer layer of the core member is injection molded into a cavity between the core member and the mold. and methods for its production have not been developed so far.
  • JP-A-63-315216 Japanese Patent Application Laid-Open No. 2018-109658
  • An object of the present invention is to easily improve the quality of a molded lens when holding a core member in a mold and injection molding only the outer layer of the core member into a cavity between the core member and the mold.
  • An object of the present invention is to provide a lens configured as above and a method for manufacturing the same.
  • the lens of the first aspect of the present invention comprises a core member and an outer layer covering the core member.
  • the core member has a flange portion protruding in a direction substantially perpendicular to the optical axis of the lens and having first and second surfaces, and the flange portion is provided on the first surface and on the first surface.
  • a first protrusion protruding substantially perpendicularly along the outer periphery of the core member and provided in an area of 0.5% or more of the outer periphery; and a second projection provided along the perimeter in an area of 0.5 percent or more of the perimeter.
  • the lens of this aspect uses the first and second protrusions when the core member is held in a mold and only the outer layer of the core member is injection molded into the cavity between the core member and the mold. It is possible to control the flow rate of the molten material flowing into the cavity by means of injection molding, so that defects due to injection molding are few and the quality is high.
  • the first protrusion and the portion corresponding to the gate of the lens are configured to partially overlap, and the second protrusion and the portion corresponding to the gate of the lens partially overlap each other.
  • the first protrusion and the second protrusion are spaced apart along the outer circumference.
  • the first and second projections are used when the core member is held in the mold and only the outer layer of the core member is injection molded into the cavity between the core member and the mold. It is easy to control the flow rate of molten material flowing into the cavity by
  • the distance between the first protrusion and the second protrusion along the outer circumference is 40 percent or less of the outer circumference.
  • the lens according to claim 1 wherein the material of the core member and the material of the outer layer are the same.
  • the material of the core member and the material of the outer layer are different.
  • a method for manufacturing a lens according to the second aspect of the present invention is a method for manufacturing a lens comprising a core member and an outer layer covering the core member.
  • the method includes a core member having a flange portion projecting in a direction substantially perpendicular to the optical axis of the lens and having first and second surfaces, the flange portion having the first surface and the a first protrusion projecting substantially perpendicularly to the first surface and provided along the outer periphery of the core member in an area of 0.5% or more of the outer periphery; a second protrusion projecting along the outer periphery of the core member and provided in an area of 0.5 percent or more of the outer periphery; Prior to molding the outer layer by injection molding between the mold and the core member, material flows appropriately from the gate to the first protrusion side and the second protrusion side of the flange. adjusting the relative positional relationship between the first protrusion and the second protrusion and the gate or adjusting the shape of the gate; molding
  • the first and second The projections can be used to control the flow rate of the molten material flowing into the cavity, resulting in a high quality lens with less defects due to injection molding.
  • the relative positional relationship between the first protrusion and the second protrusion and the gate or the shape of the gate is adjusted.
  • the nested mold can be used to easily adjust the relative positional relationship between the first and second protrusions and the gate or the shape of the gate. .
  • FIG. 1 is a perspective view of a lens according to one embodiment of the invention
  • FIG. 1 is a perspective view of a core member of a lens according to one embodiment of the present invention
  • FIG. It is a top view of a core member.
  • FIG. 3 is a perspective view of a mold for molding a core member
  • FIG. 6 is an enlarged view of a portion indicated by a square in FIG. 5
  • FIG. 2 is a plan view of an outer layer molding die used when holding a core member in the die and injection molding an outer layer into a cavity between the core member and the die. It is a figure which shows the AA cross section of FIG. It is a figure which shows the BB cross section of FIG.
  • FIG. 3 is a perspective view of a mold for molding a core member
  • FIG. 6 is an enlarged view of a portion indicated by a square in FIG. 5
  • FIG. 2 is a plan view of an outer layer molding die used when holding a core member in the die and injection molding an outer layer
  • FIG. 8 is a view showing a CC cross section of FIG. 7;
  • FIG. 8 is a diagram showing a DD cross section of FIG. 7;
  • FIG. 4 is a perspective view of a mold for molding an outer layer in which a core member is incorporated in a second portion corresponding to the other side of the lens other than the convex side.
  • 14 is an enlarged view of the portion indicated by the square in FIG. 13;
  • FIG. It is a figure which shows the gate periphery part of the cross section corresponding to FIG. 12 of the metal mold
  • FIG. 15 is a diagram showing a portion 150 corresponding to the gate of the lens molded by the outer layer molding die described using FIGS. 13 to 15.
  • FIG. FIG. 4 is a perspective view of a mold for molding an outer layer in which a core member is incorporated in a second portion corresponding to the other side of the lens other than the convex side.
  • 18 is an enlarged view of the portion indicated by the square in FIG. 17;
  • FIG. It is a figure which shows the gate periphery part of the cross section corresponding to FIG. 12 of the metal mold
  • FIG. 20 is a diagram showing a portion corresponding to a gate of a molded lens molded by the outer layer molding die described using FIGS.
  • FIG. 17 to 19 is a view showing a cross section corresponding to FIG. 12 of the gate peripheral portion of the mold for molding the outer layer.
  • FIG. FIG. 22 is a diagram showing a portion corresponding to a molded lens gate molded by the outer layer molding die described using FIG. 21;
  • FIG. 4 is a side view of a combination of the second portion of the mold for molding the outer layer and the core member;
  • FIG. 24 is a cross-sectional view taken along line A1-A1 in FIG.
  • FIG. 24 is a cross-sectional view taken along the line A1-A1 in FIG. 23 of a combination of the second part of the mold for molding the outer layer and the core member of Example 2;
  • FIG. 24 is a cross-sectional view taken along line A1-A1 in FIG. 23 of a combination of the second part of the mold for molding the outer layer and the core member of Example 3;
  • FIG. 3 shows the positions of weld lines generated when injection molding is performed in the state of the gate before adjustment.
  • Fig. 10 shows the positions of weld lines generated when injection molding is performed in the state of the gate after adjustment.
  • Fig. 10 shows the positions of air traps when injection molding is performed with the gates before adjustment.
  • FIG. 10 shows the positions of air traps when injection molding is performed with the gates after adjustment.
  • FIG. 5 shows the stress distribution in the cross section of the core member when injection molding is performed in the state of the gate before adjustment.
  • FIG. 5 shows the stress distribution in the cross section of the core member when injection molding is performed in the state of the adjusted gate.
  • 1 is a plan view of a conventional outer layer molding die;
  • FIG. It is a figure which shows the FF cross section of FIG.
  • FIG. 36 is a view showing a GG section of FIG. 35;
  • FIG. 1 is a perspective view of a lens 100 according to one embodiment of the invention.
  • FIG. 2 is a perspective view of the core member 110 of the lens 100 of one embodiment of the invention.
  • Lens 100 is manufactured by holding core member 110 in a mold and injection molding an outer layer into the cavity between core member 110 and the mold.
  • Core member 110 has a flange portion 1100 with projections 1110 and 1120 . The function of flange portion 1100 and protrusions 1110 and 1120 will be described later.
  • the core member 110 also has a retaining flange 1130 that is used to retain the core member 100 within the mold.
  • the flange portion 1100 and the holding flange portion 1130 are formed along the outer periphery of the core member 110 so as to protrude in a direction substantially perpendicular to the optical axis of the lens.
  • FIG. 3 is a plan view of the core member 110.
  • FIG. 4 is a flowchart for explaining the method of manufacturing the lens 100.
  • the core member 110 having the flange portion 1100 with the projections 1110 and 1120 on both sides is manufactured by injection molding.
  • FIG. 5 is a perspective view of the mold 400 for molding the core member.
  • FIG. 5 shows a portion of the mold 400 for molding the core member 110 corresponding to the convex side of the lens.
  • FIG. 6 is an enlarged view of the portion indicated by the square in FIG. FIG. 6 shows the gate portion of the mold.
  • the gate portion of the mold is formed by nesting molds 210 . Molten material is injected from runner 300 into nesting mold 210 .
  • the recessed portion 2110 of the mold is a portion for forming the projecting portion 1110 of the core member 110 . By exchanging the nesting mold 210, the position and shape of the projection 1110 can be changed.
  • FIG. 7 is a plan view of an outer layer molding die 500 used when holding the core member 110 in the die and injection molding the outer layer into the cavity between the core member 110 and the die.
  • FIG. 8 is a diagram showing the AA cross section of FIG.
  • a gate portion of the outer layer molding die 500 is also formed by the nesting die 220 .
  • Molten material is injected into the cavity 120 between the core member 110 and the mold 500 from the runner 300 through the nesting mold 220 .
  • the portion corresponding to the convex surface side of the lens of the outer layer molding die 500 is referred to as the first portion, and the portion corresponding to the other surface side is referred to as the second portion.
  • the molten material is divided by the flange 1100 into one that flows into the first portion of the mold 500 and one that flows into the second portion of the mold 500 .
  • protrusion 1120 is on the path through which molten material flows into the second portion of mold 500 .
  • FIG. 9 is a diagram showing a BB cross section in FIG. In the cross-section shown in FIG. 9, there are no protrusions on the path through which molten material flows into the first and second portions of mold 500 .
  • FIG. 10 is a diagram showing a CC cross section of FIG. In the cross-section shown in FIG. 10, protrusions 1110 are on the path through which molten material flows into the first portion of mold 500 .
  • FIG. 11 is a diagram showing a DD cross section of FIG.
  • the core member 110 can be retained within the mold 500 by sandwiching the retaining flange 1130 with the first and second portions of the mold 500 .
  • FIG. 12 is a diagram showing the EE cross section of FIG. A gate is located in the portion indicated by the circle in FIG.
  • Projections 1110 and 1120 are provided on the upper and lower surfaces of the flange portion 1100 of the core member 110 .
  • the protrusion 1110 protrudes substantially perpendicularly to the upper surface of the flange portion 1100
  • the protrusion 1120 protrudes substantially perpendicularly to the lower surface of the flange portion 1100 .
  • Protrusions 1110 and 1120 are formed along the outer circumference of the core member. Protrusions 1110 and 1120 act as barriers on the path of molten material flowing from the gate to the first and second portions of mold 500, respectively. Thus, by varying the area over which protrusions 1110 and 1120 partially close the opening of the gate, the flow rate of molten material flowing into the first and second portions of mold 500, respectively, can be varied.
  • FIG. 35 is a plan view of a conventional outer layer molding die.
  • FIG. 35 corresponds to FIG.
  • FIG. 36 is a diagram showing the FF section of FIG. FIG. 36 corresponds to FIGS. 8-10. There are no protrusions on the path through which the molten material flows into the first left and second right portions of the mold in prior art core members.
  • FIG. 37 is a diagram showing a GG section of FIG. FIG. 38 corresponds to FIG.
  • step S1020 of FIG. 4 before holding the core member 110 in the mold 500 and molding the outer layer into the cavity 120 between the mold 500 and the core member 110 by injection molding, the flange of the cavity 120 from the gate
  • the first protrusion 1110 and the second protrusion 1120 and the gate are arranged so that the material flows into the first protrusion 1110 side and the second protrusion 1120 side of the portion 1100 at an appropriate flow rate. Adjust the relative position or shape of the gate.
  • FIG. 13 is a perspective view of the core member 110 incorporated in the second portion of the mold 500 for molding the outer layer corresponding to the other side of the lens other than the convex side.
  • FIG. 14 is an enlarged view of the portion indicated by the square in FIG. FIG. 14 shows the gate portion of the mold.
  • the gate portion of the mold is formed by nesting molds 220 . Molten material is injected into the cavity 120 between the core member 110 and the mold 500 from the runner 300 through the nesting mold 220 .
  • a cavity 120 (not shown in FIG. 14) is formed between the core member 110 and the first portion of the outer layer molding die 500 corresponding to the convex side of the lens.
  • a gate nesting mold 220 has slots 2010 and is secured to the second part of the mold 500 by securing bolts 2020 in the slots 2010 .
  • the position of the gate nest 220 with respect to the second portion of the mold 500 can be varied longitudinally of the slot 2010 by varying the position of the fixing bolt 2020 within the slot 2010 .
  • Reference numeral 2030 represents spacers.
  • FIG. 15 is a diagram showing the gate peripheral portion of the cross section corresponding to FIG. 12 of the mold 500 for molding the outer layer.
  • the gate peripheral portion shown in FIG. 15 is the circular portion shown in FIG.
  • the opening of the gate is shaded in FIG.
  • the dark shading indicates the position of the gate opening of the first portion of the outer layer molding die 500
  • the light shading indicates the position of the gate opening of the second portion of the outer layer molding die 500 .
  • a portion of the opening of the gate of the first portion, indicated by dark shading overlaps and is partially closed by the first protrusion 1110
  • the opening of the gate of the second portion, indicated by light shading overlaps and is partially closed by the first protrusion 1110.
  • the effective length of the gate opening in the first portion and the effective length of the gate opening in the second portion can be represented by W1 and W2, respectively.
  • the width of the gate opening in the first portion and the width of the gate opening in the second portion are the same, the flow rate of the molten material flowing into the first and second portions of the mold 500 will The ratio of the flow rate of molten material flowing into the second portion is W1/W2.
  • the width of the opening is the length of the opening in the vertical direction in the drawing.
  • the initial value of W1/W2 is also expressed as the ratio of the volume of the cavity between the core member 110 and the first portion of the mold to the volume of the cavity between the core member 110 and the second portion of the mold. good.
  • step S1030 of FIG. 4 the core member 110 is held in the mold 500 and the outer layer is formed in the cavity 120 between the mold 500 and the core member 110 by injection molding.
  • FIG. 16 is a diagram showing a portion 150 corresponding to the gate of the lens 100 molded by the outer layer molding die 500 described using FIGS. 13-15.
  • step S1040 in FIG. 4 it is determined whether the quality of the molded lens 100 is acceptable. Specifically, the quality of the lens 100 is evaluated based on the occurrence of weld lines and air traps in the molded lens. If the quality is acceptable, the process ends. If the quality is not acceptable, return to step S1020 to make any necessary adjustments. Specifically, the ratio of the flow rate of molten material flowing into the first and second portions of mold 500 to the flow rate of molten material flowing into the second portion of mold 500 is adjusted.
  • FIG. 17 is a perspective view of the core member 110 incorporated in the second portion of the mold 500 for molding the outer layer corresponding to the other side of the lens other than the convex side.
  • FIG. 18 is an enlarged view of the portion indicated by the square in FIG. In FIG. 18, the fixing bolt 2020 is located at the right end of the slot 2010 and the gate nest 220 has been moved as far to the left as possible relative to the second portion of the mold 500 .
  • FIG. 19 is a view showing the gate peripheral portion of the cross section corresponding to FIG. 12 of the mold 500 for molding the outer layer.
  • the gate peripheral portion shown in FIG. 19 is the circular portion shown in FIG.
  • the portion is partially closed by the second protrusion 1120 and the effective length W2' of the opening of the gate of the second portion is smaller than W2.
  • step S1030 of FIG. 4 the core member 110 is held in the mold 500 and the outer layer is formed in the cavity 120 between the mold 500 and the core member 110 by injection molding.
  • FIG. 20 is a diagram showing a portion 150 corresponding to the gate of the molded lens 100 molded by the outer layer molding die 500 described using FIGS. 17-19.
  • the cross-section of the corresponding portion 150 is not rectangular, but is two rectangles offset from each other along adjacent sides.
  • the reason why the cross-section of the part 150 has the above shape is that the amount of telescoping of the gates in the first part of the mold 500 and the amount of telescoping of the gates in the second part of the mold 500 are different. is.
  • portion 150 the effective lengths of the openings of the gates of the first and second portions can be adjusted without moving the gate nests of the first and second portions, respectively.
  • the core member 110 with the distance between the first and second protrusions of the flange 1100 adjusted to W1′ and W2′ is molded in step S1010, and step S1030 is performed using this core member 110. good too.
  • FIG. 21 shows the core member with the distance between the first and second protrusions of the flange 1100 adjusted so that the effective lengths of the gate openings of the first and second portions are W1′ and W2′, respectively.
  • FIG. 13 is a view showing a cross section corresponding to FIG. 12 of the gate peripheral portion of the outer layer molding die 500 when used.
  • FIG. 22 is a diagram showing a portion 150 corresponding to the gate of the molded lens 100 molded by the outer layer molding die 500 described using FIG.
  • step S1040 in FIG. 4 it is determined whether the quality of the molded lens 100 is acceptable.
  • steps S1020-S1040 in FIG. 4 may be repeated. Therefore, it is preferable to manufacture a plurality of core members 110 in S1010.
  • the first protrusion 1110 and the second protrusion 1120 shown in FIGS. 15, 19 and 21 are arranged along the outer circumference of the core member 110 with a gap therebetween.
  • the first protrusions 1110 and the second protrusions 1120 may be arranged along the outer circumference of the core member 110 such that they partially or wholly overlap each other. In that case, the adjustment described above is performed by changing the positions of the first protrusion 1110 and the second protrusion 1120 along the outer periphery, respectively.
  • the material of the core member 110 and outer layers in the example is polymethyl methacrylate.
  • the present invention can also be applied when the material of the core member 110 and the material of the outer layer are different.
  • FIG. 23 is a side view of a combination of the second portion of the outer layer molding die 500 and the core member 110.
  • FIG. 24 is a cross-sectional view taken along line A1-A1 in FIG. 23 of a combination of the second portion of the outer layer molding die 500 and the core member 110 of Example 1.
  • numbers shown near double arrows indicate lengths. The unit of length is millimeters.
  • the gate nesting is positioned at the leftmost of the adjustable range.
  • the core member 110 of Example 1 is shown in FIG.
  • the length of the second protrusion 1120 of Example 1 along the outer periphery of the core member 110 is 4 millimeters, and the length of the entire outer periphery of the core member 110 is 220 millimeters.
  • the ratio of the length of the second protrusion 1120 along the outer periphery of the core member 110 in Example 1 to the length of the entire outer periphery of the core member 110 is 1.8%.
  • the distance along the outer circumference of the core member 110 between the first protrusion 1110 and the second protrusion 1120 (not shown in FIG. 24) is 4 millimeters, and the entire length of the core member 110 with the above distance.
  • the ratio to the perimeter length is 1.8 percent.
  • the holding flange portions 1130 are provided only on the left and right side surfaces of the core member 110 .
  • FIG. 25 is a cross-sectional view taken along line A1-A1 in FIG. 23 of a combination of the second portion of the outer layer molding die 500 and the core member 110 of Example 2.
  • the length of the second protrusion 1120 of Example 2 along the outer periphery of the core member 110 is 4 millimeters, and the length of the entire outer periphery of the core member 110 is 220 millimeters. Therefore, the ratio of the length of the second protrusion 1120 along the outer periphery of the core member 110 in Example 2 to the length of the entire outer periphery of the core member 110 is 1.8%.
  • Example 2 the distance along the outer periphery of the core member 110 between the first protrusion 1110 and the second protrusion 1120 (not shown in FIG. 25) is 4 millimeters, and the entire length of the core member 110 at the above distance.
  • the ratio to the perimeter length is 1.8 percent.
  • the retaining flange portion 1130 is the portion of the outer circumference of the core member 110 other than the second protrusion 1120 which is 4 millimeters in length along the circumference and the gate which is 8 millimeters in length along the circumference. Prepared for. In other words, the second projecting portion 1120 and the holding flange portion 1130 are formed continuously.
  • FIG. 26 is a cross-sectional view taken along line A1-A1 in FIG. 23 of a combination of the second portion of the outer layer molding die 500 and the core member 110 of Example 3.
  • the length along the outer periphery of the core member 110 of the second protrusion 1120 of Example 3 is 4 millimeters, and the length of the entire outer periphery of the core member 110 is 220 millimeters. Therefore, the ratio of the length of the second protrusion 1120 along the outer periphery of the core member 110 in Example 3 to the length of the entire outer periphery of the core member 110 is 1.8%.
  • Example 3 the distance along the outer periphery of the core member 110 between the first projection 1110 and the second projection 1120 (not shown in FIG. 26) is 4 millimeters, and the entire length of the core member 110 at the above distance.
  • the ratio to the perimeter length is 1.8 percent.
  • the holding flange portions 1130 of Example 3 are formed at regular intervals on the outer periphery of the core member 110 .
  • the above constant spacing is 6 millimeters.
  • the core member 110 used in the simulation has a holding flange portion 1130 around the entire periphery other than the periphery of the gate.
  • the results of the simulations vary little. Therefore, the configuration of the retaining member does not significantly affect how the molten material flows from the gate into cavity 120 .
  • Table 1 is a table showing the effective length and effective cross-sectional area of the gates of the first portion and the second portion of the mold 500 before and after adjustment.
  • the effective length of the gate in the first portion before adjustment corresponds to W1 in FIG. 15, and the effective length of the gate in the second portion before adjustment corresponds to W2 in FIG.
  • the effective length of the gate in the first portion after adjustment corresponds to W1' in FIG. 19, and the effective length of the gate in the second portion after adjustment corresponds to W2' in FIG.
  • the effective length of the gate of the first portion before adjustment corresponding to W1 is equal to the effective length of the gate of the first portion after adjustment corresponding to W1'.
  • the effective cross-sectional area of the gates of the first and second portions before adjustment is 7 square millimeters.
  • the effective cross-sectional area of the gate in the first portion after adjustment is 7 square millimeters, and the effective cross-sectional area of the gate in the second portion after adjustment is 4 square millimeters.
  • FIG. 27 shows the time from the start of injection of the molten material to the arrival of the molten material at each position in the cavity 120 when injection molding is performed in the state of the gate before adjustment.
  • the unit of time is seconds.
  • FIG. 28 shows the time from the start of injection of the molten material to the arrival of the molten material at each position in the cavity 120 when injection molding is performed in the adjusted gate state.
  • the unit of time is seconds.
  • FIG. 29 shows the positions of weld lines generated when injection molding is performed in the state of the gate before adjustment.
  • a weld line is a linear molding defect that occurs at the junction of molten resin in a mold during injection molding.
  • FIG. 30 shows the positions of weld lines generated when injection molding is performed in the gate state after adjustment.
  • Fig. 31 shows the positions where air traps are generated when injection molding is performed in the state of the gate before adjustment.
  • An air trap is a phenomenon in which air bubbles are taken in by resin flowing from multiple directions and air bubbles are generated in a molded product.
  • FIG. 32 shows the positions where air traps are generated when injection molding is performed in the state of the gate after adjustment.
  • FIG. 33 shows the cross-sectional stress distribution of the core member 110 when injection molding is performed in the state of the gate before adjustment.
  • the unit of stress is megapascal.
  • FIG. 34 shows the cross-sectional stress distribution of the core member 110 when injection molding is performed in the gate state after adjustment.
  • the unit of stress is megapascal.
  • the height reached by the molten material flowing from the lower gate into the cavity 120 of the lower second part of the mold 500 is It is approximately one-half the height of core member 110 . Therefore, when injection molding is performed in the state of the gate before adjustment, a weld line is formed in a wide range of the cavity 120 of the first portion of the mold 500 as shown in FIG. Also, when injection molding is performed in the state of the gate before adjustment, an air trap occurs in the cavity 120 of the first portion of the mold 500 as shown in FIG. Also, when injection molding is performed in the state of the gate before adjustment, a relatively large stress is generated near the holding flange 1130 of the core member 110 as shown in FIG.
  • the adjustment reduces the effective cross-sectional area of the bottom gate of mold 500 from 7 square millimeters to 4 square millimeters. Accordingly, the flow rate of molten material flowing from the lower gate of mold 500 into cavity 120 of the lower second portion of mold 500 is reduced.
  • the height reached by the molten material flowing from the lower gate into the cavity 120 of the lower second part of the mold 500 is It is approximately one-fifth the height of core member 110 . Therefore, when injection molding is performed in the state of the adjusted gate, the weld line is formed only near the boundary between the first portion and the second portion of the mold 500 as shown in FIG.
  • the weld line hardly affects the optical surface of the optical member 100 .
  • the number of air traps generated is smaller than that before the adjustment shown in FIG. 31, as shown in FIG. Limited to the flange part. Therefore, there is no effect on the optical surface 100 of the optical member of the air trap.
  • molten metal is melted almost simultaneously in the cavity 120 of the upper first portion of the mold 500 and the cavity 120 of the lower second portion of the mold 500 . material is filled. Therefore, the pressure in the lower second portion of the mold 500 is higher than the pressure in the upper first portion, and no pressure is generated from the bottom to the top, and as shown in FIG.
  • the pressure developed near flange 1130 is less than in FIG.
  • the present invention can also be applied when the material of the core member 110 and the material of the outer layer are different.

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  • Optics & Photonics (AREA)
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Citations (4)

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JPS63217301A (ja) * 1987-03-06 1988-09-09 Hitachi Ltd 複合型レンズ
JPH08190004A (ja) * 1995-01-10 1996-07-23 Nisshin Koki Kk 複合光学レンズ
US20210154957A1 (en) * 2019-11-26 2021-05-27 Alcon Inc. Method for producing contact lenses
JP2021151719A (ja) * 2020-03-24 2021-09-30 スタンレー電気株式会社 レンズの製造方法

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
JPS63217301A (ja) * 1987-03-06 1988-09-09 Hitachi Ltd 複合型レンズ
JPH08190004A (ja) * 1995-01-10 1996-07-23 Nisshin Koki Kk 複合光学レンズ
US20210154957A1 (en) * 2019-11-26 2021-05-27 Alcon Inc. Method for producing contact lenses
JP2021151719A (ja) * 2020-03-24 2021-09-30 スタンレー電気株式会社 レンズの製造方法

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