JP2021094729A - Two-color molded article and two-color molding method - Google Patents

Two-color molded article and two-color molding method Download PDF

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Publication number
JP2021094729A
JP2021094729A JP2019226228A JP2019226228A JP2021094729A JP 2021094729 A JP2021094729 A JP 2021094729A JP 2019226228 A JP2019226228 A JP 2019226228A JP 2019226228 A JP2019226228 A JP 2019226228A JP 2021094729 A JP2021094729 A JP 2021094729A
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molded product
molding
transmissive
color
light
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JP7454939B2 (en
Inventor
隆宏 木幡
Takahiro Kobata
隆宏 木幡
片山　征史
Seiji Katayama
征史 片山
真義 渡邉
Masayoshi Watanabe
真義 渡邉
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Koito Manufacturing Co Ltd
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Koito Manufacturing Co Ltd
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Priority to JP2019226228A priority Critical patent/JP7454939B2/en
Priority to CN202023031708.3U priority patent/CN214275578U/en
Priority to CN202011486464.XA priority patent/CN112984459B/en
Publication of JP2021094729A publication Critical patent/JP2021094729A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • 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
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1615—The materials being injected at different moulding stations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/24—Light guides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/236—Light guides characterised by the shape of the light guide
    • F21S43/241—Light guides characterised by the shape of the light guide of complex shape
    • 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
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C2045/1682—Making multilayered or multicoloured articles preventing defects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
    • F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles

Abstract

To provide a two-color molded article which is accurately molded, and a two-color molding method which suppresses a deformation amount during molding.SOLUTION: A two-color molded article 1 comprises: a light transmitting part 10 constituted of a light transmitting resin member, and having a surface provided with fine unevennesses by an injection molding; and a non-light transmitting part 20 constituted of a colored member, and extended so as to go around an outer circumference of the light transmitting part without being layered over the light transmitting part in a plate thickness direction. The non-light transmitting part is a primary molded article. The light transmitting part is integrally molded with the non-light transmitting part as a secondary molded article in close contact with the non-light transmitting part. The non-light transmitting part arranged outside is molded in advance in a frame-like shape as the primary molded article, which suppresses deformation of the light-transmitting part secondarily molded inside the non-light transmitting part, and accurately molds the light transmitting part itself, and also the fine unevennesses 13 and 14 on a surface of the same.SELECTED DRAWING: Figure 2

Description

本願発明は二色成形品、特に表面に微細加工部を有する透光部と非透光部とが一体成形された射出成形品の二色成形方法に関する。 The present invention relates to a two-color molded product, particularly a two-color molding method for an injection-molded product in which a translucent portion having a finely processed portion on the surface and a non-transmissive portion are integrally molded.

特許文献１や特許文献２など、車両用灯具の導光体とエクステンション、あるいは導光体と遮光壁など、光透過性樹脂部材と着色樹脂部材とを一体成形した品がある。 There are products such as Patent Document 1 and Patent Document 2 in which a light-transmitting resin member and a colored resin member are integrally molded, such as a light guide body and an extension of a vehicle lamp, or a light guide body and a light-shielding wall.

例えば図７に示すような、光透過性樹脂部材から構成され、その表面に射出成形による表面加工が施される透光部９０１と、光透過性樹脂部材の周縁に延在して配置される着色部材から構成される非透光部９０２とが一体成形された二色成形品９００の二色成形方法を、図８を用いて説明する。 For example, as shown in FIG. 7, a light-transmitting portion 901 composed of a light-transmitting resin member whose surface is surface-processed by injection molding, and a light-transmitting portion 901 extending around the peripheral edge of the light-transmitting resin member are arranged. A two-color molding method of the two-color molded product 900 in which the non-transmissive portion 902 composed of the colored member is integrally molded will be described with reference to FIG.

このような二色成形品は、まず内側に配置される透光部９０１から成形される。図８（Ａ）に示すように、固定側金型９０３と一次可動側金型９０４が型締めされ、成形空間に光透過性樹脂部材が射出され、一次成形品として透光部９０１が成形される。また、その表面には、入射してきた光を導光するための微細凹凸が成形される。 Such a two-color molded product is first molded from the translucent portion 901 arranged inside. As shown in FIG. 8A, the fixed-side mold 903 and the primary movable-side mold 904 are molded, a light-transmitting resin member is injected into the molding space, and the light-transmitting portion 901 is molded as a primary molded product. To. Further, on the surface thereof, fine irregularities for guiding the incident light are formed.

次に、図８（Ｂ）に示すように、型開きされて、一次可動側金型９０４が離間する。 Next, as shown in FIG. 8B, the mold is opened and the primary movable side mold 904 is separated.

次に、図８（Ｃ）に示すように、固定側金型９０３と二次可動側金型９０５が型締めされて、成形空間に着色樹脂部材が射出され、二次成形品として非透光部９０２が成形される。 Next, as shown in FIG. 8C, the fixed side mold 903 and the secondary movable side mold 905 are molded, and the colored resin member is injected into the molding space, and the secondary molded product is non-transmissive. Part 902 is molded.

特開２０１４−１７５２０４号Japanese Unexamined Patent Publication No. 2014-175204 特開２０１３−３７９６３号Japanese Unexamined Patent Publication No. 2013-37963

しかし、このような二色成形方法の場合、まず一次可動側金型９０４が取り外された際に、冷却収縮により、透光部９０１が変形して、両端が浮いてきてしまう（図８（Ｄ）参照）。この変形を抑え込むようにして、強制的に二次可動側金型９０５により抑え込まれた状態で非透光部９０２が成形されるうえ、寸法や体積の大きな非透光部９０２の冷却収縮による変形に伴って、内側に配置された透光部９０１もさらに変形してしまう。透光部９０１は許容範囲を超えて歪みが生じ、外観が損なわれてしまうという問題がある。また、透光部９０１の表面の微細凹凸も潰れてしまうため、入射してきた光の導光に不具合が生じるという問題もある。 However, in the case of such a two-color molding method, when the primary movable side mold 904 is first removed, the translucent portion 901 is deformed due to cooling shrinkage, and both ends are lifted (FIG. 8 (D)). )reference). In order to suppress this deformation, the non-transmissive portion 902 is formed in a state of being forcibly suppressed by the secondary movable side mold 905, and the non-transmissive portion 902 having a large size and volume is deformed due to cooling shrinkage. Along with this, the translucent portion 901 arranged inside is further deformed. There is a problem that the translucent portion 901 is distorted beyond the permissible range and the appearance is impaired. Further, since the fine irregularities on the surface of the translucent portion 901 are also crushed, there is a problem that the light guide of the incident light has a problem.

本発明は、これを鑑みてなされたものであり、精度よく成形される二色成形品と、成形時の変形量を抑えた二色成形方法を提供するものである。 The present invention has been made in view of this, and provides a two-color molded product that is molded with high accuracy and a two-color molding method that suppresses the amount of deformation during molding.

前記目的を達成するための、本開示の構成による二色成形品のある態様では、光透過性樹脂部材で構成され、射出成形による微細凹凸が施された表面を有する透光部と、着色部材で構成され、前記透光部と板厚方向に積層することなく前記透光部の外周を周回するように延在した非透光部を備え、前記非透光部は一次成形品であり、前記透光部は、前記非透光部に二次成形品として前記非透光部密着して一体成形されていよう構成した。 In one aspect of the two-color molded article according to the configuration of the present disclosure for achieving the above object, a light-transmitting portion composed of a light-transmitting resin member and having a surface having fine irregularities by injection molding, and a colored member. The non-transmissive part is provided with a non-transmissive part extending around the outer periphery of the translucent part without being laminated with the translucent part in the plate thickness direction, and the non-transmissive part is a primary molded product. The translucent portion is configured to be integrally molded with the non-transmissive portion in close contact with the non-transmissive portion as a secondary molded product.

この態様によれば、透光部が一次成形品として成形されると、型開き時に端部が反りかえってしまうが、先に外側配置される非透光部が一次成形品として形成されることで、内側配置される透光部の成形時の変形は抑えられ、全体および表面の微小凹凸も精度よく成形される。二次成形金型により透光部の表面を押さえる必要がなく、その表面の全面に亘っても微小凹凸を設けることができる。 According to this aspect, when the translucent portion is molded as a primary molded product, the end portion is warped when the mold is opened, but the non-transmissive portion arranged on the outside is formed as the primary molded product. Deformation during molding of the translucent portion arranged inside is suppressed, and minute irregularities on the entire surface and the surface are also molded with high accuracy. It is not necessary to press the surface of the translucent portion by the secondary molding die, and minute irregularities can be provided over the entire surface of the translucent portion.

また、ある態様では、前記透光部を周回する前記非透光部の一部が切り欠かれ、該切り欠き部に前記透光部の外方延出部が係合して密着し、前記二色成形品の側縁部外周面に面一に露出する前記外方延出部の端面に射出成形用のゲート痕が設けられているよう構成した。 Further, in one embodiment, a part of the non-transmissive portion that orbits the translucent portion is cut out, and the outward extending portion of the transmissive portion engages with the cutout portion to be in close contact with the cutout portion. A gate mark for injection molding is provided on the end surface of the outward extending portion that is flushly exposed on the outer peripheral surface of the side edge portion of the two-color molded product.

この態様によれば、透光部のゲート部は、二色成形品の外周面に露出するため、非透光部に積層して光透過性樹脂部材が出射されることがなく、成形時の色混ざりが防止される。 According to this aspect, since the gate portion of the translucent portion is exposed on the outer peripheral surface of the two-color molded product, the light-transmitting resin member is not emitted by being laminated on the non-transmissive portion, and at the time of molding. Color mixing is prevented.

また、ある態様では、前記非透光部の外周および内周の縁部に設けられた脚部の内側に、周方向に伸びるライン状のリブが、連続的または非連続的に突設されているよう構成した。 Further, in some embodiments, linear ribs extending in the circumferential direction are continuously or discontinuously projected inside the legs provided on the outer peripheral and inner peripheral edges of the non-transmissive portion. It was configured to be.

この態様によれば、ライン状のリブがアンダーカットとなり、外側配置される体積や寸法の大きな非透光部が一次成形されるときに成形金型にかかり、成形品の変形を抑制するため、非透光部が精度よく成形される。 According to this aspect, the line-shaped ribs are undercut, and when the non-transmissive portion having a large volume and dimensions arranged on the outside is primarily molded, it is applied to the molding die to suppress the deformation of the molded product. The non-transmissive part is molded with high accuracy.

また、ある態様では、前記脚部には、平行する複数本の前記ライン状のリブが設けられているよう構成した。 Further, in one embodiment, the legs are configured to be provided with a plurality of parallel ribs in the line shape.

ライン状のリブが複数本設けられると、その分、成形時の変形が抑制されるため、非透光部が、より高精度に成形される。 When a plurality of line-shaped ribs are provided, deformation during molding is suppressed by that amount, so that the non-transmissive portion is molded with higher accuracy.

また、ある態様では、前記ライン状のリブの最大突出量は０．５ｍｍ以内であるよう構成した。 Further, in one embodiment, the maximum protrusion amount of the line-shaped rib is configured to be within 0.5 mm.

この態様によれば、アンダーカットとしての成形金型への突出量が非常に少ないため、変形防止の効果を得つつ、分割金型などの複雑な金型を設ける必要なく、通常通りに非意匠部を型抜きをすることができる。 According to this aspect, since the amount of protrusion to the molding die as an undercut is very small, it is not necessary to provide a complicated die such as a split die while obtaining the effect of preventing deformation, and the non-design is performed as usual. The part can be die-cut.

また、ある態様では、前記ライン状のリブは、落ち込み角度が４５度以上である前記二色成形品に設けられるよう構成した。二色成形品の落ち込み角度が４５度以上である場合、三次元的に大型成形品となるため、冷却収縮による成形時の変形も大きい。このような場合に、ライン状のリブは、特に変形抑制の効果が大きくなる。 Further, in one embodiment, the line-shaped rib is configured to be provided on the two-color molded product having a depression angle of 45 degrees or more. When the dip angle of the two-color molded product is 45 degrees or more, the molded product is three-dimensionally large, so that the deformation during molding due to cooling shrinkage is large. In such a case, the line-shaped ribs are particularly effective in suppressing deformation.

また、二色成形方法のある態様として、光透過性樹脂部材で構成され、その表面には射出成形による微細凹凸が施された透光部と、着色部材で構成され、前記透光部と板厚方向に積層することなく前記透光部の外周を周回するように延在した非透光部を備えた二色成形品の成形方法であって、固定側金型と一次可動側金型とを型締めし、前記固定側金型と前記一次可動側金型の画成する第１の成形空間に、着色樹脂部材を射出し、枠状の前記非透光部を成形する一次成形工程と、前記非透光部を保持したまま前記固定側金型と二次可動側金型とを型締めし、型締めすることで画成された第２の成形空間に、光透過性樹脂部材を射出することで、前記非透光部の内側に、前記非透光部とは厚み方向に積層しない前記透光部を一体成形する二次成形工程とを備える二色成形方法を提供する。 Further, as one aspect of the two-color molding method, a light-transmitting resin member is formed, and the surface thereof is composed of a light-transmitting portion having fine irregularities formed by injection molding and a colored member, and the light-transmitting portion and the plate are formed. It is a molding method of a two-color molded product provided with a non-transmissive part extending so as to go around the outer periphery of the translucent part without laminating in the thick direction. In the primary molding step of molding the frame-shaped non-transmissive portion by injecting a colored resin member into the first molding space defined by the fixed side mold and the primary movable side mold. , The fixed side mold and the secondary movable side mold are molded while holding the non-transmissive portion, and the light transmissive resin member is placed in the second molding space defined by the molding. Provided is a two-color molding method including a secondary molding step of integrally molding the translucent portion which is not laminated with the non-transmissive portion in the thickness direction inside the non-transmissive portion by injection.

この成形方法によれば、枠状に外側配置される非透光部が一次成形されるため、内側配置される透光部は、成形される際に非透光部の冷却収縮による変形の影響を受けず、成形時の変形が抑制される。 According to this molding method, the non-transmissive portion arranged on the outside in a frame shape is primarily molded, so that the translucent portion arranged on the inside is affected by deformation due to cooling shrinkage of the non-transmissive portion during molding. It is not affected and deformation during molding is suppressed.

以上の説明から明らかなように、本発明によれば、精度よく成形される二色成形品と、成形時の変形量を抑えた二色成形方法が提供される。 As is clear from the above description, according to the present invention, there are provided a two-color molded product that is molded with high accuracy and a two-color molding method that suppresses the amount of deformation during molding.

第１の実施形態に係る二色成形品（インナーレンズユニット）であり、（Ａ）正面図、（Ｂ）断面図である。It is a two-color molded product (inner lens unit) according to the first embodiment, and is a front view (A) and a cross-sectional view (B). 第１の実施形態に係る二色成形品（インナーレンズユニット）であり、（Ａ）正面斜視図、（Ｂ）背面斜視図である。It is a two-color molded product (inner lens unit) according to the first embodiment, and is (A) front perspective view and (B) rear perspective view. 第１の実施形態に係る二色成形品（インナーレンズユニット）の成形方法のフローチャートである。It is a flowchart of the molding method of the two-color molded article (inner lens unit) which concerns on 1st Embodiment. 第１の実施形態に係る二色成形品（インナーレンズユニット）の成形方法の説明図である。It is explanatory drawing of the molding method of the two-color molded article (inner lens unit) which concerns on 1st Embodiment. 第１の実施形態に係る二色成形品（インナーレンズユニット）の成形方法の説明図である。It is explanatory drawing of the molding method of the two-color molded article (inner lens unit) which concerns on 1st Embodiment. 第２の実施形態に係る二色成形品（アウターレンズユニット）の斜視図である。It is a perspective view of the two-color molded article (outer lens unit) which concerns on 2nd Embodiment. 第２の実施形態に係る二色成形品（アウターレンズユニット）の断面図である。It is sectional drawing of the two-color molded article (outer lens unit) which concerns on 2nd Embodiment. 従来の二色成形品の正面図である。It is a front view of the conventional two-color molded product. 従来の二色成形品の成形方法とその問題点の説明図である。It is explanatory drawing of the molding method of the conventional two-color molded article and its problem.

以下、本発明の好適な実施形態を、図面を参照しながら説明する。実施形態は、発明を限定するものではなく例示であって、実施形態に記述されるすべての特徴やその組み合わせは、必ずしも発明の本質的なものであるとは限らない。各図においては、各部材の厚み、幅、長さの比率は、実際の比率を反映したものでなく、構成を模式的に表したものである。 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The embodiments are not limited to the invention, but are exemplary, and all the features and combinations thereof described in the embodiments are not necessarily essential to the invention. In each figure, the ratio of the thickness, width, and length of each member does not reflect the actual ratio, but is a schematic representation of the configuration.

（第１の実施形態）
図１および図２は、本発明の第１の実施形態に係る二色成形品であるインナーレンズユニット１を示し、図１（Ａ）が正面図、図１（Ｂ）が横断面図、図２（Ａ）が正面斜視図、図２（Ｂ）が背面斜視図をそれぞれ示す。 (First Embodiment)
1 and 2 show an inner lens unit 1 which is a two-color molded product according to the first embodiment of the present invention, FIG. 1 (A) is a front view, and FIG. 1 (B) is a cross-sectional view. 2 (A) shows a front perspective view, and FIG. 2 (B) shows a rear perspective view.

インナーレンズユニット１は、インナーレンズを構成する透光部１０と、エクステンションを構成する非透光部２０とが一体成形された二色成形品であり、車両用灯具の灯室内で、発光体の前方に配置される。 The inner lens unit 1 is a two-color molded product in which a translucent portion 10 constituting an inner lens and a non-transmissive portion 20 constituting an extension are integrally molded. Placed in front.

インナーレンズユニット１は実施形態の一例であって、本発明の構成や二色成形方法は、透光性を有する透光部と、前記透光部の外周に密着して延在し、非透光性を有する非透光部とが一体成形されていれば、導光体とエクステンション、ストップランプのカバーレンズと遮光壁、警告灯のインナーレンズとその取付部などの二色成形品にも適用できる。 The inner lens unit 1 is an example of an embodiment, and the configuration and the two-color molding method of the present invention are non-transparent because the inner lens unit 1 extends in close contact with the translucent portion and the outer periphery of the translucent portion. If the light-transmitting non-transmissive part is integrally molded, it can be applied to two-color molded products such as a light guide and an extension, a stop lamp cover lens and a light-shielding wall, and a warning light inner lens and its mounting part. it can.

透光部１０は、インナーレンズユニット１の中央に配置されており、ポリカーボネイト樹脂やポリメタクリル酸メリル樹脂等の光透過性樹脂部材で構成され、透光性を備える。本実施形態では、透光部１０は透明であるが、光を透過させる性質を有していれば着色されていても構わない。 The translucent portion 10 is arranged in the center of the inner lens unit 1, is composed of a light transmissive resin member such as a polycarbonate resin or a polymeryl methacrylate resin, and has translucency. In the present embodiment, the translucent portion 10 is transparent, but may be colored as long as it has a property of transmitting light.

透光部１０の表面１１および裏面１２の両面には、全面に亘って、シボ、ステップ、などの微小凹凸１３，１４が射出成形による表面加工として施されている。透光部１０の表１１および裏面１２に施された微小凹凸１３，１４により、透光部１０の背面に配置された発光体から出射した光は、複雑に表面１１から出射して立体的な光学意匠として視認され、透光部１０を際立たせる効果をもたらす。 On both the front surface 11 and the back surface 12 of the translucent portion 10, minute irregularities 13 and 14 such as grain and step are applied as surface treatment by injection molding over the entire surface. Due to the minute irregularities 13 and 14 provided on the front surface 11 and the back surface 12 of the translucent portion 10, the light emitted from the light emitting body arranged on the back surface of the translucent portion 10 is complicatedly emitted from the front surface 11 and is three-dimensional. It is visually recognized as an optical design and has the effect of making the translucent portion 10 stand out.

さらに表面１１および裏面１２の端縁まで微小凹凸１３，１４が施されているため、透光部１０外縁からの光漏れがなく、非透光部２０との接続が自然で、高級な印象を与える。 Furthermore, since the edges of the front surface 11 and the back surface 12 are provided with minute irregularities 13 and 14, there is no light leakage from the outer edge of the translucent portion 10, and the connection with the non-transmissive portion 20 is natural, giving a high-class impression. give away.

非透光部２０は、透光部１０を周回するように、透光部１０の外周を所定の幅をもって帯状に延在する。非透光部２０は、目隠し部材であるエクステンションを構成するため、着色処理されたポリカーボネイト樹脂やポリエステル樹脂などの、非透光性の着色樹脂部材で構成される。非透光部２０は、インナーレンズユニット１の外周を構成し、透光部１０の外周部に枠状に配置され、透光部１０と一体化している。 The non-transmissive portion 20 extends around the outer periphery of the translucent portion 10 in a strip shape with a predetermined width so as to orbit the translucent portion 10. The non-transmissive portion 20 is made of a non-transmissive colored resin member such as a colored polycarbonate resin or a polyester resin in order to form an extension which is a blindfold member. The non-transmissive portion 20 constitutes the outer periphery of the inner lens unit 1, is arranged in a frame shape on the outer peripheral portion of the translucent portion 10, and is integrated with the translucent portion 10.

透光部１０および非透光部２０の接合部である、透光部１０の外周と非透光部２０の内周の裏面側には、その全周に亘って、透光部１０には第１脚部１５が、非透光部２０には第２脚部２１が、それぞれ周壁として設けられている。さらにインナーレンズユニット１の外周（非透光部２０の外周）にも同様に、第３脚部２２が設けられている。 On the back surface side of the outer circumference of the translucent portion 10 and the inner circumference of the non-transmissive portion 20, which is a joint portion between the translucent portion 10 and the non-transmissive portion 20, the translucent portion 10 covers the entire circumference thereof. The first leg portion 15 and the non-transmissive portion 20 are provided with a second leg portion 21 as a peripheral wall. Further, a third leg portion 22 is similarly provided on the outer circumference of the inner lens unit 1 (the outer circumference of the non-transmissive portion 20).

非透光部２０の第２脚部２１および第３脚部２２の内側には、微小リブ２３が突設されている。微小リブ２３は、その高さＨ（各脚部からの最大突出量）が０．５ｍｍ以内、その幅Ｗが１ｍｍ以内程度の微小な突起であり、外周方向にライン状に設けられている。第２脚部２１には連続した一本の微小リブ２３が設けられており、第３脚部２２には平行した二本の微小リブ２３が周縁に沿って非連続に設けられている。 Micro ribs 23 are projected inside the second leg 21 and the third leg 22 of the non-transmissive portion 20. The minute rib 23 is a minute protrusion having a height H (maximum protrusion amount from each leg) of 0.5 mm or less and a width W of about 1 mm or less, and is provided in a line shape in the outer peripheral direction. The second leg 21 is provided with one continuous micro rib 23, and the third leg 22 is provided with two parallel micro ribs 23 discontinuously along the peripheral edge.

一般的に、外形や体積そのものが大きい成形品は、冷却時の収縮変形も大きいものとなるが、非透光部２０の第２脚部２１および第３脚部２２に設けられた微小リブ２３が、非透光部２０の冷却時にアンダーカットとして成形金型に係り、非透光部２０の変形を抑制する役割を果たす。このため、インナーレンズユニット１は精度よく成形されている。 In general, a molded product having a large outer shape and volume itself has a large shrinkage deformation during cooling, but the minute ribs 23 provided on the second leg 21 and the third leg 22 of the non-transmissive portion 20 However, when the non-transmissive portion 20 is cooled, it is involved in the molding mold as an undercut and plays a role of suppressing deformation of the non-transmissive portion 20. Therefore, the inner lens unit 1 is accurately molded.

微小リブ２３は、型抜き方向ＤＲ１に略直行して突出するアンダーカットであるが、その高さＨおよびその幅Ｗは極小であるため、成形金型からの取り出しは容易である。突出量は極小であっても、外周方向にライン状に設けられているため、変形抑制の効果が大きい。なお、第２脚部２１および第３脚部２２に設けられる微小リブ２３は、その本数、さらに連続的／非連続的かは問わない。微小リブ２３は、インナーレンズユニット１の内側に設けられるため、外観に影響を与えることがない。 The micro rib 23 is an undercut that protrudes substantially perpendicular to the die cutting direction DR1, but since its height H and its width W are extremely small, it can be easily taken out from the molding die. Even if the amount of protrusion is extremely small, it is provided in a line shape in the outer peripheral direction, so that the effect of suppressing deformation is great. The number of minute ribs 23 provided on the second leg 21 and the third leg 22 may be continuous or discontinuous. Since the minute rib 23 is provided inside the inner lens unit 1, it does not affect the appearance.

透光部１０と非透光部２０は、厚み方向には積層されず、両者を区画する接合面３断面は直線として表れる。 The translucent portion 10 and the non-transmissive portion 20 are not laminated in the thickness direction, and the cross section of the joint surface 3 that separates them appears as a straight line.

成形後に金型から取り外しやすいように、インナーレンズユニット１の外周面２は、四方のどの面も、裏面側から表面側に向かって、僅かに内側に傾斜している。これに対し、接合面３は、外周面２とは逆方向に傾斜している。 The outer peripheral surface 2 of the inner lens unit 1 is slightly inclined inward from the back surface side to the front surface side on all four sides so that it can be easily removed from the mold after molding. On the other hand, the joint surface 3 is inclined in the direction opposite to the outer peripheral surface 2.

これは、非透光部２０が一次成形品であるためであり、一次成形金型が外しやすいように、接合面３は型抜き方向ＤＲ１に対して、このような傾斜となるように構成されている（詳しくは後述）。一次成形品である非透光部２０をインサートした形態で、透光部１０を二次成形することで、インナーレンズユニット１は成形される。 This is because the non-transmissive portion 20 is a primary molded product, and the joint surface 3 is configured to have such an inclination with respect to the die cutting direction DR1 so that the primary molding die can be easily removed. (Details will be described later). The inner lens unit 1 is molded by secondary molding the translucent portion 10 in a form in which the non-transmissive portion 20 which is a primary molded product is inserted.

このように構成されたインナーレンズユニット１は成形時の変形が少なく、透光部１０の表面１１，裏面１２の全面に、微小凹凸１３，１４が精度よく成形されており、微小凹凸１３，１４により構成される意匠が際立つ。またインナーレンズである透光部１０と、エクステンションである非透光部２０の一体化により部品数を削減でき、組み立て効率を向上させる。 The inner lens unit 1 configured in this way is less deformed during molding, and minute irregularities 13 and 14 are accurately molded on the entire surfaces of the front surface 11 and the back surface 12 of the translucent portion 10, and the minute irregularities 13 and 14 are formed. The design composed of is outstanding. Further, the number of parts can be reduced and the assembly efficiency can be improved by integrating the translucent portion 10 which is an inner lens and the non-transmissive portion 20 which is an extension.

（二色成形方法）
上記のように構成されるインナーレンズユニット１の二色成形方法を説明する。図３は、二色成形方法のフローチャートである。図４の１および図４の２は、成形金型の概略構成を示す模式図であり、二色成形方法の工程の説明図である。図３のフローチャートに沿って、図４の１および図４の２を参照しながら、二色成形方法を工程ごとに詳細に説明する。 (Two-color molding method)
The two-color molding method of the inner lens unit 1 configured as described above will be described. FIG. 3 is a flowchart of a two-color molding method. 1 of FIG. 4 and 2 of FIG. 4 are schematic views showing a schematic configuration of a molding die, and are explanatory views of steps of a two-color molding method. The two-color molding method will be described in detail for each step with reference to 1 of FIG. 4 and 2 of FIG. 4 with reference to the flowchart of FIG.

最初に、ステップＳ１０１で、図４の１（Ａ）に示すように、固定側金型４０と一次可動側金型５０とが互いに向き合った状態で配置されて、型締めされる。まず一次成形品として非透光部２０が成形されるため、型締めされた状態で、金型内部には非透光部２０の形状に対応した成形空間Ｓ１が画成される。 First, in step S101, as shown in 1 (A) of FIG. 4, the fixed-side mold 40 and the primary movable-side mold 50 are arranged and molded so as to face each other. First, since the non-transmissive portion 20 is molded as a primary molded product, a molding space S1 corresponding to the shape of the non-transmissive portion 20 is defined inside the mold in a molded state.

本実施形態においては、インナーレンズユニット１の裏面側が固定側金型４０の成形面で、表面側が一次可動側金型５０および二次可動側金型６０の成形面で、それぞれ成形される。 In the present embodiment, the back surface side of the inner lens unit 1 is molded by the molding surface of the fixed side mold 40, and the front surface side is molded by the molding surface of the primary movable side mold 50 and the secondary movable side mold 60, respectively.

固定側金型４０の成形面には、型抜き方向ＤＲ１に略直行して窪んだ微小凹部４３が設けられている。型抜き方向ＤＲ１は、インナーレンズユニット１が固定側金型４０から離間する方向であり、一次可動側金型５０の離間方向である。微小凹部４３は微小リブ２３を成形するためのものである。 The molding surface of the fixed-side mold 40 is provided with a minute recess 43 that is recessed substantially perpendicular to the die-cutting direction DR1. The die-cutting direction DR1 is a direction in which the inner lens unit 1 is separated from the fixed-side mold 40, and is a direction in which the primary movable-side mold 50 is separated. The minute recess 43 is for forming the minute rib 23.

次に、ステップＳ１０２で、図４の１（Ｂ）に示すように、所定の融解温度に加熱された状態の着色樹脂部材が成形空間Ｓ１に射出されて、一次成形品として枠状の非透光部２０が成形される。 Next, in step S102, as shown in 1 (B) of FIG. 4, a colored resin member heated to a predetermined melting temperature is injected into the molding space S1 to form a frame-shaped non-transparent product as a primary molded product. The light portion 20 is molded.

次に、ステップＳ１０３で、図４の１（Ｃ）に示すように、非透光部２０の冷却後に、型開きされて、一次可動側金型５０が離間する。 Next, in step S103, as shown in 1 (C) of FIG. 4, after the non-transmissive portion 20 is cooled, the mold is opened and the primary movable side mold 50 is separated.

次に、ステップＳ１０４で、図４の２（Ｄ）に示すように、一次可動側金型５０に代わり、二次可動側金型６０が固定側金型４０と型締めされる。二次成形品として透光部１０がまとめ成形されるため、型締めされた状態で、金型内部には、一次成形品である非透光部２０がインサートされた形態で、透光部１０の形状に対応した成形空間Ｓ２が画成される。 Next, in step S104, as shown in 2 (D) of FIG. 4, the secondary movable side mold 60 is molded with the fixed side mold 40 instead of the primary movable side mold 50. Since the translucent portion 10 is collectively molded as a secondary molded product, the translucent portion 10 is formed by inserting the non-transmissive portion 20 which is a primary molded product into the mold in a molded state. The molding space S2 corresponding to the shape of is defined.

次に、ステップＳ１０５で、図４の２（Ｅ）に示すように、所定の融解温度に加熱された状態の光透過性樹脂部材が成形空間Ｓ２に射出され、非透光部２０の内側に、透光部１０が成形される。これにより、非透光部２０と透光部１０とが一体的に成形される。 Next, in step S105, as shown in 2 (E) of FIG. 4, a light-transmitting resin member heated to a predetermined melting temperature is injected into the molding space S2 and inside the non-transmissive portion 20. , The translucent portion 10 is molded. As a result, the non-transmissive portion 20 and the translucent portion 10 are integrally molded.

次に、ステップＳ１０６で、図４の２（Ｆ）に示すように、型開きされて、インナーレンズユニット１が金型から取り外される。まず二次可動側金型６０が離間し、インナーレンズユニット１が固定側金型４０から取り外される。固定側金型４０にはアンダーカットである微小凹部４３が設けられているが、その凹み量は、微小リブ２３に対応して最大で０．５ｍｍ程度であるため、固定側金型４０からの押し出しピン（図示せず）による押し出しで、インナーレンズユニット１をそのままの状態で取り外しすることができる。 Next, in step S106, as shown in 2 (F) of FIG. 4, the mold is opened and the inner lens unit 1 is removed from the mold. First, the secondary movable side mold 60 is separated, and the inner lens unit 1 is removed from the fixed side mold 40. The fixed-side mold 40 is provided with an undercut minute recess 43, but the amount of the recess is about 0.5 mm at the maximum corresponding to the minute rib 23, so that the fixed-side mold 40 has a minute recess 43. The inner lens unit 1 can be removed as it is by extruding with an extrusion pin (not shown).

（作用効果）
上記成形方法で成形されたインナーレンズユニット１の作用効果を、図７に示される従来の二色成形品９００、および図８に示される従来の二色成形方法と比較して説明する。 (Action effect)
The action and effect of the inner lens unit 1 molded by the above molding method will be described in comparison with the conventional two-color molded product 900 shown in FIG. 7 and the conventional two-color molding method shown in FIG.

図７および図８に示すように、従来の成形方法では、一次成形品として内側配置される透光部９０１を先に成形するため、外側配置される二次成形品である非透光部９０２の冷却時に、透光部９０１も一体となって変形してしまうことから、透光部９０１の変形量が非常に大きくなるという問題があった。 As shown in FIGS. 7 and 8, in the conventional molding method, the translucent portion 901 arranged inside as the primary molded product is molded first, so that the non-transmissive portion 902 which is the secondary molded product arranged outside is molded first. Since the translucent portion 901 is also deformed as a unit during cooling, there is a problem that the amount of deformation of the translucent portion 901 becomes very large.

これに対し、インナーレンズユニット１においては、外側配置される非透光部２０を一次成形品としているため、二次成形品である透光部１０は、非透光部２０の冷却収縮の影響を受けず、変形量が比較的小さく、精度よく成形されている。さらに、微小リブ２３により、非透光部２０自体の変形量も少なく、インナーレンズユニット１全体の歪みが少なく、精度よく成形されている。 On the other hand, in the inner lens unit 1, since the non-transmissive portion 20 arranged on the outside is a primary molded product, the translucent portion 10 which is a secondary molded product is affected by the cooling shrinkage of the non-transmissive portion 20. It is not affected, the amount of deformation is relatively small, and it is molded with high accuracy. Further, due to the minute ribs 23, the amount of deformation of the non-transmissive portion 20 itself is small, the distortion of the entire inner lens unit 1 is small, and the inner lens unit 1 is molded with high accuracy.

また、従来の二色成形品９００のように、透光部９０１に表面加工が施されている場合、透光部９０１が一次成形されると、冷却収縮により反りあがって、端部が浮き上がるため（図８（Ｄ）参照）、成形の精度が悪かった。特に表面加工の微小凹凸が損なわれるため、所望の配光が得られなない、という問題があった。 Further, when the translucent portion 901 is surface-treated as in the conventional two-color molded product 900, when the translucent portion 901 is primarily molded, it warps due to cooling shrinkage and the end portion rises. (See FIG. 8 (D)), the molding accuracy was poor. In particular, there is a problem that a desired light distribution cannot be obtained because the fine irregularities of the surface treatment are impaired.

インナーレンズユニット１においては、透光部１０は二次成形品であるため、非透光部２０と一体化して冷却されることから、このような現象は発生しない。このため、透光部１０全体も、微小凹凸１３，１４も、精度よく成形されている。 In the inner lens unit 1, since the translucent portion 10 is a secondary molded product, it is integrally cooled with the non-transmissive portion 20, so that such a phenomenon does not occur. Therefore, the entire translucent portion 10 and the minute irregularities 13 and 14 are molded with high accuracy.

さらに、従来の二次可動側金型９０５には透光部９０１上に突出する抑え部９０７を設けらなければならず（図８（Ｃ）参照）、透光部９０１の表面端部まで微細凹凸を設けることができなかった（図７参照）。透光部９０１においては、微細凹凸の施されていない縁部から光漏れが発生し、意匠性を損なう、という問題があった。 Further, the conventional secondary movable mold 905 must be provided with a holding portion 907 protruding above the translucent portion 901 (see FIG. 8C), and the surface end portion of the translucent portion 901 is fine. Unevenness could not be provided (see FIG. 7). In the translucent portion 901, there is a problem that light leakage occurs from the edge portion which is not provided with fine irregularities, which impairs the design.

インナーレンズユニット１においては、透光部１０が二次成形されるため、１０の表面１１および裏面１２の全面に、微小凹凸１３，１４を施すことができ、両面の微小凹凸１３，１４による斬新な光学的意匠を提供できる。 In the inner lens unit 1, since the translucent portion 10 is secondarily molded, the entire surfaces of the front surface 11 and the back surface 12 of the 10 can be provided with minute irregularities 13 and 14, which are novel by the minute irregularities 13 and 14 on both sides. Can provide various optical designs.

（型抜き方向）
インナーレンズユニット１は、非透光部２０を一次成形品として備える。一般的に二色成形品の一次成形品または二次成形品などの成形順序は、成形品の型抜き方向に対する勾配方向などにより把握される。型抜き方向は、可動側金型や成形品が固定側金型から離間する方向である。可動側金型や成形品を取り外しができるように、固定側金型の成形面の凸部はすべて型抜き方向に対してプラス勾配で構成されており、二色成形品や一次成形品の外周面も、型抜き方向に対してプラス勾配となるように構成される。さらに、押し出しピン跡や脚部が設けられた位置や方向などにより、二色成形品の型抜き方向および成形順序などの特徴が把握される。 (Die-cutting direction)
The inner lens unit 1 includes a non-transmissive portion 20 as a primary molded product. Generally, the molding order of a primary molded product or a secondary molded product of a two-color molded product is grasped by a gradient direction with respect to a die-cutting direction of the molded product. The die-cutting direction is the direction in which the movable-side mold and the molded product are separated from the fixed-side mold. All the convex parts of the molding surface of the fixed side mold are configured with a positive gradient with respect to the die cutting direction so that the movable side mold and the molded product can be removed, and the outer circumference of the two-color molded product and the primary molded product. The surface is also configured to have a positive gradient with respect to the die cutting direction. Further, the characteristics such as the die-cutting direction and the molding order of the two-color molded product can be grasped from the positions and directions in which the extrusion pin marks and the legs are provided.

インナーレンズユニット１においては、接合面３は外周面２と異なり外側へ向かって傾斜していることから、非透光部２０が一次成形品と把握される（透光部が一次成形品である場合、図８（Ｃ）に示す透光部９０１のように、接合面９０６は内側に向かって傾斜する）。 In the inner lens unit 1, since the joint surface 3 is inclined outward unlike the outer peripheral surface 2, the non-transmissive portion 20 is grasped as a primary molded product (the translucent portion is a primary molded product). In this case, the joint surface 906 is inclined inward as shown in the translucent portion 901 shown in FIG. 8C).

（第２実施形態）
図５は本発明の第２の実施形態に係るアウターレンズユニット１０１の斜視図である。図６はアウターレンズユニット１０１の断面図である。 (Second Embodiment)
FIG. 5 is a perspective view of the outer lens unit 101 according to the second embodiment of the present invention. FIG. 6 is a cross-sectional view of the outer lens unit 101.

アウターレンズユニット１０１は、車両前照灯の筐体の一部を構成し、ヘッドランプの光を透過するアウターレンズである透光部１１０と、カバー部材である非透光部１２０とが一体化した二色成形品である。第１の実施形態に係るインナーレンズユニット１に比べ、長尺品で、全体が大きく湾曲している。なお、第１の実施形態同様に、透光部１１０の表面および裏面には全面に亘って微細加工が施されているが、図５、図６においてはこれを省略している。 The outer lens unit 101 constitutes a part of the housing of the vehicle headlight, and the translucent portion 110, which is an outer lens that transmits the light of the headlamp, and the non-transmissive portion 120, which is a cover member, are integrated. It is a two-color molded product. Compared to the inner lens unit 1 according to the first embodiment, it is a long product and the whole is greatly curved. Similar to the first embodiment, the front surface and the back surface of the translucent portion 110 are microfabricated over the entire surface, but this is omitted in FIGS. 5 and 6.

非透光部１２０は、透光部１１０の外周部に沿って帯状に延在しているが、一か所だけ、切り欠き部１２０ａを備えている。透光部１１０はこの切り欠き部１２０ａと密着一体化した延出部１１０ａを備える。延出部１１０ａはアウターレンズユニット１０１の側縁部の外周面１０２に面一に露出しており、さらにその露出した端部に射出成形用のゲート痕Ｇを有する。 The non-transmissive portion 120 extends in a band shape along the outer peripheral portion of the translucent portion 110, but includes a notch portion 120a only in one place. The translucent portion 110 includes an extension portion 110a that is closely integrated with the notch portion 120a. The extending portion 110a is flush with the outer peripheral surface 102 of the side edge portion of the outer lens unit 101, and further has a gate mark G for injection molding at the exposed end portion.

これは、透過性樹脂部材を射出成形する場合、ゲート痕が表面には露出しないように、ゲート部は非透過部との積層部に設けられるが、このように透光部１１０のゲート部をアウターレンズユニット１０１の外周面に露出させることで、非透光部１２０との積層部を設けることなく、直接、透過性樹脂部材を射出することができる。溶解した二次成形用の透過性樹脂部材が射出され、一次成形された着色樹脂部材の積層部を通過する際の色交じりを防止することができる。これにより、色交じりによる二次成形品の外観不具合や光透過率の低下による機能低下を防止することができる。 This is because when the transparent resin member is injection-molded, the gate portion is provided in the laminated portion with the non-transmissive portion so that the gate mark is not exposed on the surface. In this way, the gate portion of the translucent portion 110 is provided. By exposing the outer lens unit 101 to the outer peripheral surface, the transparent resin member can be directly injected without providing a laminated portion with the non-transmissive portion 120. It is possible to prevent color mixing when the melted transparent resin member for secondary molding is injected and passes through the laminated portion of the primary molded colored resin member. As a result, it is possible to prevent an appearance defect of the secondary molded product due to color mixing and a functional deterioration due to a decrease in light transmittance.

図６に示すように、透光部１１０および非透光部１２０には、第１の実施形態同様に、両者の接合部の裏面側に、全周に亘って、第１脚部１１５，第２脚部１２１が設けられている。さらにアウターレンズユニット１０１の外周（非透光部１２０の外周）にも、第３脚部１２２が設けられている。本実施形態では、第３脚部１２２にのみ、微小リブ１２３が平行して二か所に設けられている。 As shown in FIG. 6, the translucent portion 110 and the non-transmissive portion 120 have the first leg portion 115, the first leg portion 115, on the back surface side of the joint portion of the two, as in the first embodiment, over the entire circumference. Two legs 121 are provided. Further, a third leg portion 122 is also provided on the outer circumference of the outer lens unit 101 (the outer circumference of the non-transmissive portion 120). In the present embodiment, the minute ribs 123 are provided in parallel at two places only on the third leg portion 122.

アウターレンズユニット１０１（非透光部１２０）の落ち込み角度αが大きく、奥行きに比して上下に高い構成となっている。落ち込み角度αとは、成形品の任意の断面において、上方端部を基準として、他端までの水平からの落ち込み角度であり、成形品表面の最小曲率が小さくなる、あるいは上下に長くなると、落ち込み角度αは大きくなる傾向がある。 The outer lens unit 101 (non-transmissive portion 120) has a large dip angle α, and is configured to be vertically high with respect to the depth. The dip angle α is a dip angle from the horizontal to the other end with respect to the upper end in an arbitrary cross section of the molded product, and when the minimum curvature of the surface of the molded product becomes small or becomes long in the vertical direction, the dip angle α is The angle α tends to be large.

落ち込み角度αが大きい場合、三次元的な大型成形物となるため、冷却収縮での三次元的変形により、成形変形量も大きくなる。このため、落ち込み角度αが大きい場合、特に非透光部１２０のように落ち込み角度α＝４５度以上の大型成形物においては、微小リブ１２３による変形抑え効果が大きくなる。 When the drop angle α is large, the molded product is a three-dimensional large-sized molded product, so that the amount of molding deformation is also large due to the three-dimensional deformation due to cooling shrinkage. Therefore, when the dip angle α is large, the deformation suppressing effect of the minute rib 123 becomes large, especially in a large molded product having a dip angle α = 45 degrees or more such as the non-transmissive portion 120.

アウターレンズユニット１０１の型抜き方向ＤＲ２は上方向になっており、これは外周面１０２の勾配により把握される。非透光部１２０が一次成形品であるため、接合面１０３は型抜き方向ＤＲ２に対して外側へ向かって傾斜している（透光部１１０が一次成形品である場合、図６中二点鎖線のように、接合面は内側に向かって傾斜する）。第１の実施形態と同様に、一次成形品である非透光部１２０をインサートした形態で、透光部１１０が二次成形される。このため、透光部１１０の変形が抑制され、アウターレンズユニット１０１は精度よく成形される。 The die-cutting direction DR2 of the outer lens unit 101 is upward, which is grasped by the gradient of the outer peripheral surface 102. Since the non-transmissive portion 120 is a primary molded product, the joint surface 103 is inclined outward with respect to the die cutting direction DR2 (when the translucent portion 110 is a primary molded product, two points in FIG. 6). Like a chain line, the joint surface slopes inward). Similar to the first embodiment, the translucent portion 110 is secondarily molded in a form in which the non-transmissive portion 120, which is a primary molded product, is inserted. Therefore, the deformation of the translucent portion 110 is suppressed, and the outer lens unit 101 is accurately molded.

以上、本発明の好ましい実施形態や変形例について述べたが、上記の実施形態は本発明の一例であり、これらを当業者の知識に基づいて組み合わせることが可能であり、そのような形態も本発明の範囲に含まれる。 The preferred embodiments and modifications of the present invention have been described above, but the above-described embodiments are examples of the present invention, and these can be combined based on the knowledge of those skilled in the art. Included in the scope of the invention.

１：インナーレンズユニット（二色成形品）
２，１０２：外周面
３，１０３：接合面
１０，１１０：透光部
１１０ａ：延出部
１１：表面
１２：裏面
１３，１４：微小凹凸
２０，１２０：非透光部
１２０ａ：切り欠き部
２１，２２：脚部
２３：微小リブ
４０：固定側金型
５０：一次可動側金型
６０：二次可動側金型
１０１：アウターレンズユニット（二色成形品）
Ｇ：ゲート痕
ＤＲ１，ＤＲ２，ＤＲ３：型抜き方向
Ｈ：高さ
Ｓ１０１〜Ｓ１０５：ステップ
Ｓ１，Ｓ２：成形空間
α：落ち込み角度 1: Inner lens unit (two-color molded product)
2,102: Outer peripheral surface 3,103: Joint surface 10,110: Translucent portion 110a: Extension portion 11: Front surface 12: Back surface 13, 14: Microconcavities and convexities 20, 120: Non-transmissive portion 120a: Notch portion 21 , 22: Leg 23: Micro rib 40: Fixed side mold 50: Primary movable side mold 60: Secondary movable side mold 101: Outer lens unit (two-color molded product)
G: Gate marks DR1, DR2, DR3: Die-cutting direction H: Height S101 to S105: Steps S1, S2: Molding space α: Depression angle

Claims (7)

光透過性樹脂部材で構成され、射出成形による微細凹凸が施された表面を有する透光部と、
着色部材で構成され、前記透光部と板厚方向に積層することなく前記透光部の外周を周回するように延在した非透光部を備え、
前記非透光部は一次成形品であり、前記透光部は、前記非透光部に二次成形品として前記非透光部に密着して一体成形されている、
ことを特徴とする二色成形品。 A translucent part composed of a light-transmitting resin member and having a surface with fine irregularities formed by injection molding.
It is composed of a colored member, and is provided with a non-transmissive portion extending so as to go around the outer periphery of the transmissive portion without being laminated with the translucent portion in the plate thickness direction.
The non-transmissive portion is a primary molded product, and the translucent portion is integrally molded with the non-transmissive portion as a secondary molded product in close contact with the non-transmissive portion.
A two-color molded product characterized by this. 前記透光部を周回する前記非透光部の一部が切り欠かれ、該切り欠き部に前記透光部の外方延出部が係合して密着し、前記二色成形品の側縁部外周面に面一に露出する前記外方延出部の端面に射出成形用のゲート痕が設けられている、
ことを特徴とする請求項１に記載の二色成形品。 A part of the non-transmissive portion that orbits the translucent portion is cut out, and the outward extending portion of the translucent portion engages with the cutout portion to be in close contact with the cutout portion, and the side of the two-color molded product. A gate mark for injection molding is provided on the end surface of the outward extending portion that is flushly exposed on the outer peripheral surface of the edge portion.
The two-color molded product according to claim 1. 前記非透光部の外周および内周の縁部に設けられた脚部の内側に、周方向に伸びるライン状のリブが、連続的または非連続的に突設されている、
ことを特徴とする請求項１または請求項２に記載の二色成形品。 Line-shaped ribs extending in the circumferential direction are continuously or discontinuously projected inside the legs provided on the outer peripheral and inner peripheral edges of the non-transmissive portion.
The two-color molded product according to claim 1 or 2, characterized in that. 前記脚部には、平行する複数本の前記ライン状のリブが設けられている、
ことを特徴とする請求項３のいずれかに記載の二色成形品。 The legs are provided with a plurality of parallel ribs in the line shape.
The two-color molded product according to any one of claims 3, characterized in that. 前記ライン状のリブの最大突出量は０．５ｍｍ以内である、
ことを特徴とする請求項３または請求項４に記載の二色成形品。 The maximum protrusion amount of the line-shaped rib is within 0.5 mm.
The two-color molded article according to claim 3 or 4. 前記ライン状のリブは、落ち込み角度が４５度以上である前記透光部に設けられている、
ことを特徴とする請求項３から請求項５のうちのいずれかに記載の二色成形品。 The line-shaped rib is provided in the translucent portion having a dip angle of 45 degrees or more.
The two-color molded product according to any one of claims 3 to 5, characterized in that. 光透過性樹脂部材で構成され、その表面には射出成形による微細凹凸が施された透光部と、着色部材で構成され、前記透光部と板厚方向に積層することなく前記透光部の外周を周回するように延在した非透光部を備えた二色成形品の成形方法であって、
固定側金型と一次可動側金型とを型締めし、前記固定側金型と前記一次可動側金型の画成する第１の成形空間に、着色樹脂部材を射出し、枠状の前記非透光部を成形する一次成形工程と、
前記非透光部を保持したまま前記固定側金型と二次可動側金型とを型締めし、型締めすることで画成された第２の成形空間に、光透過性樹脂部材を射出することで、前記非透光部の内側に、前記透光部を一体成形する二次成形工程と、
を備えることを特徴とする二色成形方法。 It is composed of a light-transmitting resin member, and its surface is composed of a light-transmitting portion having fine irregularities formed by injection molding and a colored member, and the light-transmitting portion is not laminated with the light-transmitting portion in the plate thickness direction. It is a molding method of a two-color molded product having a non-transmissive part extending so as to go around the outer circumference of the molding.
The fixed-side mold and the primary movable-side mold are molded, and a colored resin member is injected into the first molding space defined by the fixed-side mold and the primary movable-side mold, and the frame-shaped mold is formed. The primary molding process for molding the non-transmissive part and
The fixed side mold and the secondary movable side mold are molded while holding the non-transmissive portion, and the light transmissive resin member is injected into the second molding space defined by the mold fastening. By doing so, a secondary molding step of integrally molding the translucent portion inside the non-transmissive portion, and
A two-color molding method characterized by comprising.
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