CN116394559A - Lens forming method of composite optical film - Google Patents

Lens forming method of composite optical film Download PDF

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Publication number
CN116394559A
CN116394559A CN202310261142.2A CN202310261142A CN116394559A CN 116394559 A CN116394559 A CN 116394559A CN 202310261142 A CN202310261142 A CN 202310261142A CN 116394559 A CN116394559 A CN 116394559A
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CN
China
Prior art keywords
lens
die
optical film
die holder
mold base
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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.)
Pending
Application number
CN202310261142.2A
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Chinese (zh)
Inventor
罗咏如
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Yongcheng Optronics Corp
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Yongcheng Optronics Corp
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Publication date
Application filed by Yongcheng Optronics Corp filed Critical Yongcheng Optronics Corp
Priority to CN202310261142.2A priority Critical patent/CN116394559A/en
Publication of CN116394559A publication Critical patent/CN116394559A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/0048—Moulds for lenses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/0048—Moulds for lenses
    • B29D11/00538—Feeding arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00951—Measuring, controlling or regulating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Ophthalmology & Optometry (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

The invention discloses a lens forming method of a composite optical film, which comprises the following steps: the molding die is provided with an upper die seat and a lower die seat, the upper die seat is provided with an upper die core, an upper lens die part is formed on the downward end surface of the upper die core, the lower die seat is provided with a lower die core, and a lower lens die part is formed on the upward end surface of the lower die core; arranging an optical film preheated to a softened state on the lower lens mold part; arranging the optical film on the lower lens mold part; a plastic supply mechanism for injecting the measured hot melt plastic from above the center of the optical film; the upper die holder and the lower die holder are matched to form a lens forming space between the upper lens die part and the lower lens die part; and (5) keeping the upper die holder and the lower die holder to be matched with the hot-melt plastic for cooling, and then manufacturing the lens with the optical diaphragm.

Description

Lens forming method of composite optical film
Technical Field
The present invention relates to a method for forming a lens, and more particularly to a method for forming a lens with a composite optical film.
Background
Referring to fig. 7, in a conventional method for manufacturing an optical lens by injection molding, a molten resin material 8 is extruded into a molding mold 9, the molding mold has a mold cavity 91 and a runner 92 therein, the mold cavity 91 is communicated with the runner 92, and the molten resin material is extruded into the mold cavity 91 through the runner 92 to manufacture the optical lens.
In order to apply the optical lens to the field of Virtual Reality (VR), an optical film is disposed on a mirror surface, and light passes through the optical film to generate an enlarged virtual image, so as to provide an immersion experience for a user, therefore, in the conventional optical lens, the optical film 94 is firstly absorbed on the inner wall of the mold cavity 91 by the air suction channel 93 in the mold cavity 91 in a manner of in-mold labeling during injection molding, and then the molten resin material 8 is injected into the mold cavity 91, and the molding mold 9 is kept in a pressure-maintaining state to cool and then the lens with the optical film is manufactured.
However, since the optical film 94 is made of soft material, when the molten resin material 8 is injected laterally from the mold cavity 91, the molten resin material 8 is easy to push the optical film 94 or infiltrate between the film 94 and the inner wall of the mold cavity 91, resulting in poor yield; in addition, if the cavity 91 is too narrow in the middle, the molten resin material 8 cannot be smoothly injected from one side to the other, and thus the center thickness of the lens is limited, so that the lens cannot be effectively thinned. The suction channel 93 is only on one side of the mold cavity 91 and only adsorbs one optical film 94, which cannot achieve the function of producing a double-sided optical film.
In the optical device provided in chinese patent No. 111413799, the optical film is directly disposed on the lens in a film coating or attaching manner, but the thickness of the adhesive used for attaching is not easy to control, or the adhesive layer is unevenly coated, which will cause the adhesive layer to affect the light transmission path.
In addition, the existing optical film needs to be pre-pressed and heated to be molded to conform to the curvature of the lens, so that a procedure is needed in the manufacturing process, and the output efficiency cannot be effectively improved.
Disclosure of Invention
The present invention provides a lens molding method of a composite optical film, which is to put an optical film into a mold part from top to bottom and inject hot-melt plastic, and mold the optical film by an upper mold base and a lower mold base, so as to directly form a lens with the optical film, without pre-pressing the film to form a spherical surface in advance, so as to improve the output efficiency, and can be manufactured into a lens with a double-sided optical film, and the lens is thinned by injecting the hot-melt plastic from top to bottom.
In order to achieve the above-mentioned object, the present invention provides a lens molding method of a composite optical film, comprising the following steps:
a. the forming die comprises an upper die holder and a lower die holder arranged at the opposite lower part of the upper die holder, wherein the upper die holder is provided with an upper die core, an upper lens die part is formed on the downward end face of the upper die core, the lower die holder is provided with a lower die core, and a lower lens die part is formed on the upward end face of the lower die core;
b. when the upper die holder is separated from the lower die holder, an optical film is arranged on the lower lens die part;
c. a plastic supply mechanism for injecting the measured hot melt plastic from above the center of the optical film;
d. the upper die base and the lower die base are matched to drive the upper lens die part and the lower lens die part to be close to each other, a lens forming space is formed between the upper lens die part and the lower lens die part, and the pressure average value of the hot melt plastic is improved;
e. maintaining the upper die holder and the lower die holder to be matched with the hot-melt plastic for cooling so as to manufacture a lens.
Preferably, the optical film is preheated to a softened state.
Preferably, before the upper die holder and the lower die holder are assembled, another optical film is arranged on the hot-melt plastic, and the upper die holder and the lower die holder are assembled and maintained until the hot-melt plastic is cooled, so that a double-sided optical film lens is manufactured.
Preferably, the die assembly temperature of the upper die holder and the lower die holder is 110 ℃ to 120 ℃, and the upper die holder is heated to 60 ℃ to 80 ℃ when the upper die holder and the lower die holder are separated.
Preferably, the plastic feeding mechanism adopts low-injection-pressure (less than 200kg/cm < 2 >) extrusion type discharging.
The invention has the beneficial effects that: the invention puts the optical film into the mould part from top to bottom and injects the hot-melt plastic, and the lens with the optical film can be directly formed by the mould closing of the upper mould base and the lower mould base, the film is not needed to be pre-pressed and molded in advance to be spherical, so as to improve the output efficiency, and the lens with the double-sided optical film can be manufactured, and the lens is thinned by injecting the hot-melt plastic from top to bottom.
Drawings
Fig. 1 is a flowchart illustrating steps of a first embodiment of the present invention.
Fig. 2 to 5 are schematic views illustrating operations for manufacturing a lens according to a first embodiment of the present invention.
Fig. 6 is a schematic view of a second embodiment of the present invention with a diaphragm.
Fig. 7 is a cross-sectional view of a conventional molding die.
Detailed Description
Referring to fig. 1 to 5, in a first embodiment of a method for forming a lens of a composite optical film according to the present invention, a forming mold includes an upper mold base 1 and a lower mold base 2 disposed below the upper mold base 1, wherein:
the upper die holder 1 has an upper die core 11, the upper die core 11 has a first cylindrical portion 12 extending downward, the outer contour of the first cylindrical portion 12 is cylindrical, and the first cylindrical portion 12 has an upper lens die portion 13 formed on a downward end surface, wherein the die clamping temperature of the upper die holder 1 is 110 ℃ to 120 ℃.
The lower die holder 2 is provided on a base 5, the lower die holder 2 has a die cavity 21 penetrating downwards from an upper end surface thereof, for example, a round lens is manufactured, the inner edge shape (i.e. cross-sectional shape) of the die cavity 21 is round and corresponds to the outer contour shape of the round lens to be manufactured, the first cylindrical portion 12 is correspondingly accommodated downwards in the die cavity 21, the upper die holder 1 and the upper die cavity 11 are synchronously driven by a transmission mechanism (not shown), so that the first cylindrical portion 12 can perform an upper displacement and a lower displacement in the die cavity 21, the lower die holder 2 has a lower die cavity 22, the lower die cavity 22 has a second cylindrical portion 23 positioned in the die cavity 21, a lower lens die portion 24 is formed on the upward end surface of the second cylindrical portion 23, the outer contour of the second cylindrical portion 23 also corresponds to the inner edge shape of the die cavity 21, the lower die cavity 22 is driven by a pushing mechanism (not shown), so that the second cylindrical portion 23 can also perform a lower displacement in the die cavity 21 and the upper die cavity 2 and the lower die cavity 110 ℃ is 120 ℃.
Referring to fig. 1 to 5, in a step flow of actually manufacturing a lens in a first embodiment of the lens forming method of a composite optical film provided by the present invention, as shown in fig. 2, when the upper die holder 1 is separated from the lower die holder 2, the upper die holder 1 is heated to 170 ℃ to 200 ℃, and an optical film 3 preheated to a softened state is disposed on the lower lens die portion 24; next, as shown in fig. 3, a plastic feeding mechanism 4 is laterally inserted between the upper film seat 1 and the lower die holder 2, and the material injection hole 41 is aligned with the center position of the optical film 3, and the measured hot melt plastic is injected from above the center position of the optical film 3, so that the optical film 3 is fully attached to the lower lens die 24 by the extrusion pressure of the hot melt plastic; then, as shown in fig. 4, the upper mold base 1 and the lower mold base 2 are clamped to drive the upper lens mold portion 13 and the lower lens mold portion 24 to approach each other, so as to form a lens molding space 31 filled with hot-melt plastic between the upper lens mold portion 13 and the lower lens mold portion 24, and to raise the average pressure of the hot-melt plastic; maintaining the upper mold base 1 and the lower mold base 2 to be closed, and cooling the plastic to be hot-melted in the lens forming space 31 in a pressure-maintaining state through the upper mold core 11 and the lower mold core 22 to obtain a lens with an optical film; finally, as shown in fig. 5, the upper mold base 1 is opened upwards, the first cylindrical portion 12 is moved out of the cavity hole 21, the lower mold core 22 is moved upwards, and the second cylindrical portion 23 is ejected upwards out of the cavity hole 21, so that the lens with the optical film manufactured can be taken out from the lower lens mold portion 24.
It should be noted that, since the cavity 21 is an open space, the temperature of the hot-melt plastic is required to be heated to 300 ℃ because the temperature of the hot-melt plastic is reduced more rapidly than the temperature of the plastic in the closed space in the conventional injection molding; in addition, by heating the upper die holder 1 to 170-200 ℃ when separating from the lower die holder 2, the upper die holder 1 is prevented from being cooled to a temperature lower than that of the hot-melt plastic to influence the molding of the lens while waiting for injection.
In addition, the invention adopts low injection pressure (less than 200kg/cm 2) extrusion type discharging, and the caliber of the material injection port 41 is only slightly smaller than the diameter of the material pipe, so that the problem that plastic is convoluted and air is mixed when plastic flows out of the material injection port due to high injection molding pressure in the prior art can be avoided, and the hot-melt plastic can smoothly flow out of the material injection port 41.
The invention injects hot-melt plastic from the upper part of the center of the optical film 3 by the plastic feeding mechanism 4, so that the hot-melt plastic can be spread outwards from the center of the optical film 3 and uniformly distributed on the optical film 3, and the optical film 3 is pressed down by the injection impact force of the hot-melt plastic, thus avoiding the plastic from being injected laterally as in the prior art, being easy to push the film or permeate between the film and the mold cavity, thereby improving the yield, and adjusting the size of the lens forming space 31 by injecting materials from top to bottom and then closing the mold, so as to achieve the effect of thinning the lens, and the optical film 3 in a softened state can be fully attached on the lower lens mold part 24 by the pressure of the hot-melt plastic for forming a spherical cambered surface conforming to the curvature of the lens without pre-pressing the optical film 3 in advance, thereby achieving the effect of improving the output efficiency.
Referring to fig. 6, the lens forming method of the composite optical film provided by the present invention further has a second embodiment, and the difference between the second embodiment and the first embodiment is that, before the upper die holder 1 and the lower die holder 2 are assembled, another optical film 3' is disposed on the hot-melt plastic, then the upper die holder 1 and the lower die holder 2 are assembled and kept to be assembled until the hot-melt plastic is cooled, so as to form a lens, and two opposite sides of the lens are respectively provided with an optical film, so as to achieve the function of manufacturing a lens with double-sided optical film; in addition, in the second embodiment, when the upper die holder 1 and the lower die holder 2 are closed, the upper die holder 1 uses the upper lens die portion 13 to press the optical film 3' downward, so that the optical film 3' in a softened state can be fully attached to the upper lens die portion 13 to form a spherical cambered surface conforming to the curvature of the lens, and the optical film 3' does not need to be pre-pressed and molded in advance.

Claims (5)

1. The lens forming method of the composite optical film is characterized by comprising the following steps of:
a. the forming die comprises an upper die holder and a lower die holder arranged at the opposite lower part of the upper die holder, wherein the upper die holder is provided with an upper die core, an upper lens die part is formed on the downward end face of the upper die core, the lower die holder is provided with a lower die core, and a lower lens die part is formed on the upward end face of the lower die core;
b. when the upper die holder is separated from the lower die holder, an optical film is arranged on the lower lens die part;
c. a plastic supply mechanism for injecting the measured hot melt plastic from above the center of the optical film;
d. the upper die base and the lower die base are matched to drive the upper lens die part and the lower lens die part to be close to each other, a lens forming space is formed between the upper lens die part and the lower lens die part, and the pressure average value of the hot melt plastic is improved;
e. maintaining the upper die holder and the lower die holder to be matched with the hot-melt plastic for cooling so as to manufacture a lens.
2. The method of claim 1, wherein the optical film is preheated to a softened state.
3. The method of claim 1, wherein another optical film is placed on the hot-melt plastic before the upper mold base and the lower mold base are assembled, and the upper mold base and the lower mold base are assembled and maintained until the hot-melt plastic is cooled to form a double-sided optical film lens.
4. The method of claim 1, wherein the mold clamping temperatures of the upper mold base and the lower mold base are respectively 110 ℃ to 120 ℃, and the upper mold base is heated to 60 ℃ to 80 ℃ when the upper mold base is separated from the lower mold base.
5. The method of claim 1, wherein the plastic feeding mechanism is extruded at a low injection pressure (less than 200kg/cm 2).
CN202310261142.2A 2023-03-17 2023-03-17 Lens forming method of composite optical film Pending CN116394559A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310261142.2A CN116394559A (en) 2023-03-17 2023-03-17 Lens forming method of composite optical film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310261142.2A CN116394559A (en) 2023-03-17 2023-03-17 Lens forming method of composite optical film

Publications (1)

Publication Number Publication Date
CN116394559A true CN116394559A (en) 2023-07-07

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ID=87006632

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310261142.2A Pending CN116394559A (en) 2023-03-17 2023-03-17 Lens forming method of composite optical film

Country Status (1)

Country Link
CN (1) CN116394559A (en)

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