WO2013146312A1 - 光学素子の製造方法 - Google Patents
光学素子の製造方法 Download PDFInfo
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- WO2013146312A1 WO2013146312A1 PCT/JP2013/057259 JP2013057259W WO2013146312A1 WO 2013146312 A1 WO2013146312 A1 WO 2013146312A1 JP 2013057259 W JP2013057259 W JP 2013057259W WO 2013146312 A1 WO2013146312 A1 WO 2013146312A1
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/021—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/14—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles in several steps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0003—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor of successively moulded portions rigidly joined to each other
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/02—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore of moulding techniques only
-
- 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
- B29D11/00432—Auxiliary operations, e.g. machines for filling the moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14336—Coating a portion of the article, e.g. the edge of the article
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
- B29L2011/0016—Lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/026—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using retaining rings or springs
Definitions
- the present invention relates to a method for manufacturing an optical element.
- Patent Document 1 describes a manufacturing method in which a glass preform is compression-molded and cured to form a lens portion, and then an edge portion is integrally formed on the outer periphery of the lens portion by injection molding.
- Patent Document 1 it is described that a plastic lens having a high degree of design freedom may be used.
- plastic has a larger shrinkage rate at the time of curing than glass, and therefore, when the edge portion is integrally formed by the method disclosed in Patent Document 1, the surface accuracy of the optical surface of the lens is poor.
- an object of the present invention is to provide a method for manufacturing an optical element including a lens having a good surface accuracy of an optical surface in an optical element in which an edge portion is integrally formed with a plastic lens.
- a compression molding process in which the mold is closed in the above atmosphere and the transfer surface of the molding die is transferred to the compression molding material, and the injection molding material is injected into the injection molding space in the mold closed state of the molding die and compressed.
- the edge portion is integrally formed by injection molding with respect to the compression molded lens portion
- the surface pressure of the optical surface of the lens portion is deteriorated by using the injection pressure generated by this injection molding.
- a high quality optical element can be manufactured stably.
- FIG. 1 is a diagram for explaining an embodiment of the present invention, and is a schematic cross-sectional view of a pair of upper mold 13 and lower mold 15 for molding an optical element 59 (see FIG. 4).
- the molding die 11 includes a pair of an upper die 13 and a lower die 15 and is a die for obtaining an optical element 59 including a plastic lens portion 51 by molding using these.
- the state shown in FIG. 1 is a state in which the compression molding material M1 is placed on the lower mold 15.
- the compression molding material M1 is a substantially ellipsoidal preform made of a thermoplastic resin.
- the shape of the preform is not limited to this.
- a cylindrical shape may be sufficient and a substantially spherical shape may be sufficient.
- the upper mold 13 includes a columnar core portion 17 and a substantially cylindrical body portion 19 in which the core portion 17 is inserted and fitted so as to be relatively movable with respect to the core portion 17.
- the trunk portion 19 is partially cut off.
- the body portion 19 is formed with an injection gate 55 for supplying a thermoplastic injection molding material M2 to be described later.
- the upper mold 13 (core portion 17) and the lower mold 15 are respectively formed with an upper mold transfer surface 21 and a lower mold transfer surface 23 for molding the optical element 59 from the compression molding material M1.
- the upper mold transfer surface 21 is a lens transfer surface 21a that is in a range on the inner circumferential side from the circumferential boundary S1, and an inner circumferential side from the circumferential boundary S2, and is located on the outer circumferential side from the boundary S1.
- the flange transfer surface 21b is a range
- the edge transfer surface 21c is a range on the outer peripheral side of the circumferential boundary S2.
- the lens transfer surface 21 a is a surface for forming an optical surface of the lens unit 51.
- the flange transfer surface 21 b is a surface for forming the flange surface of the flange portion 53.
- the edge transfer surface 21 c is a surface for forming the edge surface of the edge portion 57.
- the lower mold transfer surface 23 has a lens transfer surface 23a which is a range on the inner peripheral side from the circumferential boundary portion S1, and a transfer surface 23b which is a range on the outer peripheral side from the boundary portion S1.
- the lens transfer surface 23 a is a surface for forming the optical surface of the lens unit 51.
- the transfer surface 23 b is a surface for forming both the flange surface of the flange portion 53 and the edge surface of the edge portion 57.
- a step may be provided on the transfer surface 23b, such as the edge transfer surface 21c, so that the height of the flange surface on the lower mold 15 side and the edge surface are different.
- the flange transfer surface 21b and the edge transfer surface 21c may be a continuous flat surface without providing a step on the edge transfer surface 21c as in the transfer surface 23b. Good.
- FIG. 2 is a cross-sectional view showing the upper mold 13 and the lower mold 15 in a closed state.
- a cavity 25 serving as a space for molding the optical element 59 is provided between the upper mold transfer surface 21 and the lower mold transfer surface 23 that are arranged to face each other. Is defined.
- the cavity 25 has a compression molding space 27 and an annular injection molding space 29 connected to the outer peripheral edge of the compression molding space 27.
- the compression molding space 27 is mainly defined between the lens transfer surface 21a and the lens transfer surface 23a, and the injection molding space 29 is defined between the edge transfer surface 21c and the transfer surface 23b.
- the compression molding space 27 has an optical surface molding space 27a and an annular indentation compensation space 27b connected to the outer periphery of the optical surface molding space 27a.
- the optical surface molding space 27a is defined between the lens transfer surface 21a and the lens transfer surface 23a
- the indentation compensation space 27b is defined between the flange transfer surface 21b and the transfer surface 23b.
- FIG. 3 is a diagram showing a compression molding process and an injection molding process.
- the compression molding material M1 is introduced into the compression molding space 27, the mold is closed in an atmosphere at a temperature equal to or higher than the glass transition temperature of the compression molding material M1, and the lens transfer surface 21a and the lens transfer surface 23a are compressed. Transcript to. First, the upper mold 13 and the lower mold 15 are brought close to each other. Then, the lens transfer surface 21 a comes into contact with the compression molding material M ⁇ b> 1 placed on the lower mold 15. And it heats until the compression molding material M1 becomes more than a glass transition temperature, and the upper mold
- the compression molding material M1 is pressed in the compression molding space 27, and the compression molding material M1 spreads along the lens transfer surface 21a and the lens transfer surface 23a. Furthermore, with the pressing, the compression molding material M1 spreads along the flange transfer surface 21b and the transfer surface 23b (FIG. 3A).
- the lens transfer surface 21a and the lens transfer surface 23a are sufficiently transferred to the compression molding material M1.
- an interface 47a (outer peripheral edge of the compression molding material M1) of the outer peripheral portion 47 of the compression molding material M1 is formed by pressing.
- the interface 47a has a free curved surface. A part of the interface 47 a may be in contact with the outer peripheral edge of the compression molding space 27.
- an injection molding process is performed.
- the injection mold material M2 is injected into the injection molding space 29 while the upper mold 13 and the lower mold 15 are closed, and an injection molded portion is formed at the interface 47a of the compression molded material M1.
- injection of the injection molding material M2 from the injection gate 55 into the injection molding space 29 is started while the upper mold 13 and the lower mold 15 are closed.
- FIG. 3B shows immediately after the injected injection molding material M2 starts to enter the injection molding space 29.
- the compression molding material M1 becomes a temperature lower than the glass transition temperature
- the injection of the injection molding material M2 is started.
- the injected injection molding material M2 spreads over the entire outer peripheral edge of the compression molding material M1 through the injection molding space 29 and is combined with the compression molding material M1 (FIG. 3C). At this time, pressure is applied to the compression molding material M1 by the injection of the injection molding material M2, and the compression molding material M1 is deformed.
- the compression molding material M1 and the injection molding material M2 that are integrated are cooled while the upper mold 13 and the lower mold 15 are closed, and are sufficiently cured (curing process). Thereafter, the molded optical element 59 is released from the upper mold 13 and the lower mold 15. Specifically, the upper die 13 is separated from the lower die 15, and the core portion 17 of the upper die 13 is moved relative to the trunk portion 19 in the axial direction.
- the optical element 59 is taken out through the above steps.
- FIG. 4 is a cross-sectional view of the optical element 59 along the optical axis Ax direction.
- the optical element 59 has an optical surface having an optical axis Ax.
- the optical element 59 includes a lens part 51 including the optical axis Ax, an annular flange part 53 formed on the outer peripheral edge of the lens part 51, and an edge part 57 formed on the outer peripheral edge of the flange part 53.
- the flange portion 53 has an inner flange portion 53a formed from the compression molding material M1 and an outer flange portion 53b formed from the injection molding material M2.
- the boundary surface between the inner flange portion 53a and the outer flange portion 53b has an uneven shape. Specifically, the boundary surface has a shape in which a part thereof protrudes toward the optical axis Ax and a shape in which another part protrudes in a direction away from the optical axis Ax.
- the injection molding for molding the edge portion 57 before the compression molding material M1 falls below the glass transition temperature. Inject material M2. If it carries out like this, the injection pressure of the injection molding material M2 will be applied to the compression molding material M1, and the force which pushes the compression molding material M1 inside will act on the compression molding material M1. Thereby, the fall of the surface precision of the optical surface of the optical element 59 which is easy to occur at the time of hardening of the compression molding material M1 can be prevented.
- the interface 47a of the compression molding material M1 is deformed by the pressure for injecting the injection molding material M2.
- the indentation compensation space 27b for molding the flange portion 53 the injection molding that enters in this space is provided.
- the material M2 can be absorbed.
- the optical performance of the optical surface of the lens unit 51 is not affected.
- the boundary surface between the formed inner flange portion 53a and outer flange portion 53b has a complicated curved surface, the lens portion 51 and the edge portion 57 are difficult to separate due to impact or the like.
- the temperature of the compression molding material M1 may be equal to or higher than the glass transition temperature. . Thereby, the deformation of the interface 47a in the circumferential direction of the compression molding material M1 becomes uniform.
- a bulging portion in which a part of the compression molding material M1 bulges in the injection molding space 29 may be formed. This is useful when the flange portion 53 cannot be secured so large.
- the lens unit 51 has a concave lens shape
- the effect of preventing deterioration of the surface accuracy of the optical surface is high. This is because in the case of the concave lens shape, the peripheral portion is thicker than the central portion including the optical axis Ax of the lens portion 51, and the pressing force at the time of compression molding on the peripheral portion easily escapes to the outside.
- the thickness of the central portion of the optical surface molding space 27a (the thickness of the central portion including the optical axis Ax of the lens portion 51) is d 1
- the thickness of the indentation compensation space 27b (the thickness of the peripheral portion of the lens portion 51) is d. 2 is useful when the ratio d 2 / d 1 is in the range of 1.2 ⁇ d 2 / d 1 ⁇ 10 and the thickness d 1 is in the range of 0.04 mm ⁇ d 1 ⁇ 0.7 mm. is there.
- the lens portion 51 of the optical element 59 formed in such a range has a concave lens shape with a large refractive power.
- outer flange portion 53b and the edge portion 57 may be opaque and are preferably black. Accordingly, the outer flange portion 53b has a light shielding function, and the optical performance of the lens portion 51 can be enhanced.
- Injection molding material A method of manufacturing an optical element that starts injection of a material.
- the compression molding space includes an optical surface molding space defined between the pair of molding lens transfer surfaces, and an annular indentation compensation space connected to the outer periphery of the optical surface molding space.
- the said injection molding space is a manufacturing method of the optical element connected to the outer periphery of the said indentation compensation space.
- the method for manufacturing an optical element wherein the injection molding space is a space for molding an edge portion formed on an outer peripheral edge of the indentation compensation portion.
- the indentation compensator has a first part formed of the compression molding material and a second part formed of the injection molding material, and a boundary surface between the first part and the second part.
- a part of the method is a method of manufacturing an optical element having a shape protruding toward the optical axis of the lens unit.
Abstract
Description
射出成形工程は、上型13と下型15が型閉じ状態で、射出成形用空間29に射出成形材料M2を射出し、圧縮成形された圧縮成形材料M1の界面47aに射出成形部を形成する。まず、上型13と下型15が型閉じ状態のまま、射出成形材料M2を、射出ゲート55から射出成形用空間29内に射出を開始する。FIG.3Bでは、射出された射出成形材料M2が射出成形用空間29内に入り始めた直後を示している。ここで、圧縮成形材料M1がガラス転移温度より低い温度になる前に、射出成形材料M2の射出を開始する。
(1) 一対の成形型を用いた成形加工によって、プラスチック製のレンズ部を含む光学素子を得る光学素子の製造方法であって、上記一対の成形型の型閉時に形成されるキャビティが、圧縮成形用空間と、上記圧縮成形用空間の外周縁に接続される環状の射出成形用空間とを有し、上記成形型の上記圧縮成形用空間に圧縮成形材料を投入し、上記圧縮成形材料のガラス転移温度以上の雰囲気で型閉じして上記成形型の転写面を上記圧縮成形材料に転写する圧縮成形工程と、上記成形型の型閉じ状態で、上記射出成形用空間に射出成形材料を射出し、圧縮成形された上記圧縮成形材料の外周縁に射出成形部を形成する射出成形工程と、を含み、上記射出成形工程は、上記圧縮成形材料がガラス転移温度より低い温度になる前に、上記射出成形材料の射出を開始する光学素子の製造方法。
(2) (1)に記載の光学素子の製造方法であって、上記射出成形工程において、上記射出成形材料の射出によって、上記圧縮成形材料の外周縁を変形する光学素子の製造方法。
(3) (1)又は(2)に記載の光学素子の製造方法であって、
上記圧縮成形用空間は、上記一対の成形型のレンズ転写面との間で画成される光学面成形用空間と、上記光学面成形用空間の外周縁に接続される環状の押込補償空間とを有し、
上記射出成形用空間は、上記押込補償空間の外周縁に接続される光学素子の製造方法。
(4) (3)に記載の光学素子の製造方法であって、
上記圧縮成形材料を硬化する硬化工程を備え、
上記硬化工程の開始と同時に、上記射出成形材料の射出を開始する光学素子の製造方法。
(5) (3)又は(4)に記載の光学素子の製造方法であって、
上記射出成形材料を射出によって、上記圧縮成形材料の外周縁が全周に渡って囲われたときに、上記圧縮成形材料の温度は、ガラス転移温度以上である光学素子の製造方法。
(6) (3)から(5)のいずれか一つに記載の光学素子の製造方法であって、
上記射出成形工程の前に、上記圧縮成形材料の一部が上記射出成形用空間に膨出した膨出部を形成する光学素子の製造方法。
(7) (3)から(6)のいずれか一つに記載の光学素子の製造方法であって、
上記レンズ部は凹レンズ形状を有する光学素子の製造方法。
(8) (7)に記載の光学素子の製造方法であって、
上記成形型の型閉じ状態における上記圧縮成形用空間の中央部の厚みをd1、上記圧縮成形用空間の外周縁の厚みをd2とするとき、比率d2/d1が1.2≦d2/d1≦10の範囲であり、上記厚みd1が0.04mm≦d1≦0.7mmの範囲である光学素子の製造方法。
(9) (3)から(8)のいずれか一つに記載の光学素子の製造方法であって、
上記光学面成形用空間は、上記光学素子のレンズ部を成形するための空間であり、上記押込補償空間は、上記レンズ部の外周縁に形成される環状の押込補償部を成形するための空間であり、上記射出成形用空間は、上記押込補償部の外周縁に形成されるコバ部を成形するための空間である光学素子の製造方法。
(10) (9)に記載の光学素子の製造方法であって、
上記押込補償部は、上記圧縮成形材料で形成される第1の部分と上記射出成形材料で形成される第2の部分を有し、上記第1の部分と上記第2の部分の境界面の一部は、上記レンズ部の光軸に向かって突出した形状を有する光学素子の製造方法。
(11) (10)に記載の光学素子の製造方法であって、
上記第2の部分は不透明である光学素子の製造方法。
(12) (3)から(8)のいずれか一つに記載の光学素子の製造方法であって、上記押込補償空間と上記射出成形用空間との間に、形状的な段差が存在しない光学素子の製造方法。
13 上型
15 下型
21 上型転写面
23 下型転写面
M1 圧縮成形材料
M2 射出成形材料
Claims (12)
- 一対の成形型を用いた成形加工によって、プラスチック製のレンズ部を含む光学素子を得る光学素子の製造方法であって、
前記一対の成形型の型閉時に形成されるキャビティが、圧縮成形用空間と、該圧縮成形用空間の外周縁に接続される環状の射出成形用空間とを有し、
前記成形型の前記圧縮成形用空間に圧縮成形材料を投入し、該圧縮成形材料のガラス転移温度以上の雰囲気で型閉じして前記成形型の転写面を前記圧縮成形材料に転写する圧縮成形工程と、
前記成形型の型閉じ状態で、前記射出成形用空間に射出成形材料を射出し、圧縮成形された前記圧縮成形材料の外周縁に射出成形部を形成する射出成形工程と、を含み、
前記射出成形工程は、前記圧縮成形材料がガラス転移温度より低い温度になる前に、前記射出成形材料の射出を開始する光学素子の製造方法。 - 請求項1に記載の光学素子の製造方法であって、
前記射出成形工程において、前記射出成形材料の射出によって、前記圧縮成形材料の外周縁を変形する光学素子の製造方法。 - 請求項1又は2に記載の光学素子の製造方法であって、
前記圧縮成形用空間は、前記一対の成形型のレンズ転写面との間で画成される光学面成形用空間と、前記光学面成形用空間の外周縁に接続される環状の押込補償空間とを有し、
前記射出成形用空間は、前記押込補償空間の外周縁に接続される光学素子の製造方法。 - 請求項3に記載の光学素子の製造方法であって、
前記圧縮成形材料を硬化する硬化工程を備え、
前記硬化工程の開始と同時に、前記射出成形材料の射出を開始する光学素子の製造方法。 - 請求項3又は4に記載の光学素子の製造方法であって、
前記射出成形材料を射出によって、前記圧縮成形材料の外周縁が全周に渡って囲われたときに、前記圧縮成形材料の温度は、ガラス転移温度以上である光学素子の製造方法。 - 請求項3から5のいずれか一項に記載の光学素子の製造方法であって、
前記射出成形工程の前に、前記圧縮成形材料の一部が前記射出成形用空間に膨出した膨出部を形成する光学素子の製造方法。 - 請求項3から6のいずれか一項に記載の光学素子の製造方法であって、
前記レンズ部は凹レンズ形状を有する光学素子の製造方法。 - 請求項7に記載の光学素子の製造方法であって、
前記成形型の型閉じ状態における前記圧縮成形用空間の中央部の厚みをd1、該圧縮成形用空間の外周縁の厚みをd2とするとき、比率d2/d1が1.2≦d2/d1≦10の範囲であり、前記厚みd1が0.04mm≦d1≦0.7mmの範囲である光学素子の製造方法。 - 請求項3から8のいずれか一項に記載の光学素子の製造方法であって、
前記光学面成形用空間は、前記光学素子のレンズ部を成形するための空間であり、前記押込補償空間は、前記レンズ部の外周縁に形成される環状の押込補償部を成形するための空間であり、前記射出成形用空間は、前記押込補償部の外周縁に形成されるコバ部を成形するための空間である光学素子の製造方法。 - 請求項9に記載の光学素子の製造方法であって、
前記押込補償部は、前記圧縮成形材料で形成される第1の部分と前記射出成形材料で形成される第2の部分を有し、
前記第1の部分と前記第2の部分の境界面の一部は、前記レンズ部の光軸に向かって突出した形状を有する光学素子の製造方法。 - 請求項10に記載の光学素子の製造方法であって、
前記第2の部分は不透明である光学素子の製造方法。 - 請求項3から8のいずれか一項に記載の光学素子の製造方法であって、
前記押込補償空間と前記射出成形用空間との間に、形状的な段差が存在しない光学素子の製造方法。
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