JP2007196579A - Mold for injection molding, molded article and camera - Google Patents

Mold for injection molding, molded article and camera Download PDF

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JP2007196579A
JP2007196579A JP2006019401A JP2006019401A JP2007196579A JP 2007196579 A JP2007196579 A JP 2007196579A JP 2006019401 A JP2006019401 A JP 2006019401A JP 2006019401 A JP2006019401 A JP 2006019401A JP 2007196579 A JP2007196579 A JP 2007196579A
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mold
cavity
plane
molded product
injection molding
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JP5103743B2 (en
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Koji Hiraide
幸司 平出
Hidenori Miyamoto
英典 宮本
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Nikon Corp
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Nikon Corp
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  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold for injection molding capable of suppressing poor adhesion of plating, a molded article and a camera using this molded article. <P>SOLUTION: The mold 3 for injection molding is equipped with a cavity mold 30 which can be divided into a first cavity mold 31 and a second cavity mold 32, and a core mold 33. The cavity face 311 of the first cavity mold 31 is finished into a mirror surface-like finish, and the second cavity face 321 of the second cavity mold 32 is finished into a satin-like finish. The first cavity face 311 and the second cavity face 321 have different angles of inclination on their tapered faces. An air vent 323 is provided on a contacting face 322 being a boundary face where the surface finishing conditions and shapes (the angles of inclination of the tapered faces) are changed to vent air in the mold and gas generated from a resin from the air vent 323. As gas burning and gas occlusion can be prevented in the mold 3 for injection molding, formation of an anchor hole is not inhibited during plating processing for the molded article and poor adhesion of a plating layer can be suppressed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、射出成形の技術に関する。   The present invention relates to an injection molding technique.

射出成形用の金型によって樹脂成形品を成形し、その成形品の表面にメッキを施すことが知られている（特許文献１参照）。   It is known to mold a resin molded product with a mold for injection molding and to plate the surface of the molded product (see Patent Document 1).

特開２０００−２２５６３５号公報JP 2000-225635 A

しかし、鏡面と梨地面とのように表面形状の異なる面を有する成形品の場合、従来の射出成形用の金型によって成形した成形品にメッキを施すと、表面形状が変わる境界面でメッキの密着不良が発生しやすい。   However, in the case of a molded product having surfaces with different surface shapes, such as a mirror surface and a satin surface, if plating is performed on a molded product formed by a conventional injection mold, plating is performed at the boundary surface where the surface shape changes. Adhesion failure is likely to occur.

（１） 請求項１の発明による射出成形用金型は、第１の平面と、第１の平面とは形状が異なる第２の平面とを有する、成形品を射出成形するための射出成形用金型であって、第１の平面と第２の平面との境界部分で、第１の平面を有する第１キャビティと第２の平面を有する第２キャビティとに分割したキャビティを備えることを特徴とする。
（２） 請求項２の発明は、請求項１に記載の射出成形用金型において、第１キャビティと第２キャビティとの分割面の少なくとも一方には、金型内部の気体を外部に逃がすための隙間を設けたことを特徴とする。
（３） 請求項３の発明は、請求項１または請求項２に記載の射出成形用金型において、第２の平面は、梨地状に仕上げられた梨地表面を形成する凹凸面は滑らかであることを特徴とする。
（４） 請求項４の発明による成形品は、請求項１〜３のいずれか一項に記載した射出成形用金型を用いて成形したことを特徴とする。
（５） 請求項５の発明は、請求項４に記載の成形品において、第１の平面と第２の平面とがメッキ加工されていることを特徴とする。
（６） 請求項６の発明は、請求項４または請求項５に記載の成形品において、ＡＢＳ樹脂を用いて成形したことを特徴とする。
（７） 請求項７の発明によるカメラは、請求項４〜６のいずれか一項に記載の成形品を外装用部品として用いることを特徴とする。 (1) An injection molding die according to the invention of claim 1 has a first plane and a second plane having a shape different from the first plane, for injection molding for injection molding a molded product. A mold comprising a cavity divided into a first cavity having a first plane and a second cavity having a second plane at a boundary portion between the first plane and the second plane. And
(2) According to a second aspect of the present invention, in the injection mold according to the first aspect, at least one of the dividing surfaces of the first cavity and the second cavity allows the gas inside the mold to escape to the outside. A gap is provided.
(3) The invention according to claim 3 is the injection mold according to claim 1 or claim 2, wherein the second flat surface has a smooth uneven surface forming a satin finished surface. It is characterized by that.
(4) The molded product according to the invention of claim 4 is characterized by being molded using the injection mold described in any one of claims 1 to 3.
(5) The invention according to claim 5 is the molded article according to claim 4, wherein the first plane and the second plane are plated.
(6) The invention of claim 6 is characterized in that the molded article of claim 4 or claim 5 is molded using an ABS resin.
(7) A camera according to a seventh aspect of the invention is characterized in that the molded product according to any one of the fourth to sixth aspects is used as an exterior part.

本発明によれば、表面状態が良好な第１の平面と第２の平面とを得ることができる。   According to the present invention, it is possible to obtain a first plane and a second plane having a good surface state.

図１〜４を参照して、本発明による射出成形用金型、成形品およびカメラの第１の実施の形態を説明する。図１は、カメラの前部カバーおよび内部構造を示す図である。カメラ１は、本体部１００と、本体部１００に取り付けられる前部カバー２００とを備えている。なお、カメラ１は、本体部１００の後部に取り付けられる後部カバーも備えているが、図１ではその記載を省略している。   A first embodiment of an injection mold, molded product, and camera according to the present invention will be described with reference to FIGS. FIG. 1 is a diagram illustrating a front cover and an internal structure of a camera. The camera 1 includes a main body unit 100 and a front cover 200 attached to the main body unit 100. The camera 1 also includes a rear cover attached to the rear portion of the main body 100, but the description thereof is omitted in FIG.

本体部１００には、被写体像を撮像するためのレンズを保持するレンズ鏡筒１０１と、合焦および焦点距離変更のためにレンズ鏡筒１０１で保持されたレンズを駆動するレンズ駆動機構１０２と、カメラ１の各部を制御するための制御基板１０３とが設けられている。   The main body 100 includes a lens barrel 101 that holds a lens for capturing a subject image, a lens driving mechanism 102 that drives a lens held by the lens barrel 101 for focusing and focal length change, A control board 103 for controlling each part of the camera 1 is provided.

前部カバー２００は、本体部１００の前部に取り付けられてカメラ１のボディ（外装）の一部を構成する。前部カバー２００には、レンズ鏡筒用開口２０１と、リングカバー２１０とが設けられている。レンズ鏡筒用開口２０１は、レンズ鏡筒１０１がカメラ１の前方へ伸張可能とするための開口である。   The front cover 200 is attached to the front portion of the main body 100 and constitutes a part of the body (exterior) of the camera 1. The front cover 200 is provided with a lens barrel opening 201 and a ring cover 210. The lens barrel opening 201 is an opening that allows the lens barrel 101 to extend forward of the camera 1.

リングカバー２１０は、前部カバー２００の前面に、レンズ鏡筒用開口２０１の周囲を囲うように取り付けられたリング状の部材である。図２に示すように、リングカバー２１０は、前方から後方に向かって外周部分のテーパ面の角度が変化するように成形されている。リングカバー２１０はＡＢＳ樹脂製であり、後述するように射出成形によって成形された成形品にメッキが施されている。   The ring cover 210 is a ring-shaped member attached to the front surface of the front cover 200 so as to surround the periphery of the lens barrel opening 201. As shown in FIG. 2, the ring cover 210 is formed so that the angle of the tapered surface of the outer peripheral portion changes from the front to the rear. The ring cover 210 is made of ABS resin, and a molded product molded by injection molding is plated as will be described later.

前部カバー１に取り付けられたときに最も前方に位置する外周部分のテーパ面（以下、鏡面仕上げ部と呼ぶ）２１１は鏡面状に仕上げられている。前部カバー１に取り付けられたときに鏡面仕上げ部２１１よりも後方に位置する外周部分のテーパ面（以下、梨地仕上げ部と呼ぶ）２１２は梨地状に仕上げられている。   A taper surface (hereinafter referred to as a mirror finish portion) 211 of the outer peripheral portion located at the foremost position when attached to the front cover 1 is finished in a mirror shape. When attached to the front cover 1, a tapered surface (hereinafter referred to as a satin finish portion) 212 at the outer peripheral portion located behind the mirror finish portion 211 is finished in a satin finish.

このように、鏡面仕上げ部２１１および梨地仕上げ部２１２という、表面形状（表面の仕上げ状態）の異なるリングカバー２１０をカメラ１の外装の一部として採用することで、カメラ１の質感を向上できる。   In this way, the texture of the camera 1 can be improved by adopting the ring cover 210 having different surface shapes (finished surfaces) as the mirror exterior finishing portion 211 and the satin finishing portion 212 as a part of the exterior of the camera 1.

−−−メッキ処理について−−−
ＡＢＳ樹脂製品に対する金属メッキ処理の工程は公知であるが、おおよそ次のとおりである。射出成形によって成形された成形品の表面をエッチング液によってエッチングする。これにより、成形品の表層近傍に存在するブタジエンゴムの粒子が溶解する。ブタジエンゴム粒子が溶解した部分には、溶解前のブタジエンゴム粒子の形状と略同形状の穴（以下、単にアンカーホールと呼ぶ）が空く。 ---- About plating treatment ---
The process of the metal plating process for the ABS resin product is known, but is roughly as follows. The surface of the molded product molded by injection molding is etched with an etching solution. As a result, the butadiene rubber particles existing in the vicinity of the surface layer of the molded product are dissolved. In the portion where the butadiene rubber particles are dissolved, a hole (hereinafter simply referred to as an anchor hole) having substantially the same shape as the shape of the butadiene rubber particles before dissolution is vacated.

次いで、成形品の表面に吸着力の強い、還元力のある金属を付加させる。この成形品を化学メッキ液に浸漬させると、化学メッキ液中の銅イオンが還元されて、成形品の表面に銅が析出する。その後、電気メッキを行うことで、成形品の表面に析出した銅層の上にニッケル層およびクロム層を形成する。   Next, a metal having a strong adsorptive power and a reducing power is added to the surface of the molded product. When this molded product is immersed in a chemical plating solution, copper ions in the chemical plating solution are reduced, and copper is deposited on the surface of the molded product. Then, a nickel layer and a chromium layer are formed on the copper layer deposited on the surface of the molded product by electroplating.

リングカバー２１０に施されるのは、下地となる成形品の表面形状がそのまま表れる薄付けメッキである。薄付けメッキは、たとえば銅層の厚さが３〜５μｍ程度であり、ニッケル層の厚さが５μｍ程度であり、クロム層の厚さが０．２μｍ程度である。これにより、メッキ処理前の成形品の表面形状が梨地状であれば、メッキ処理後の表面形状も梨地状に仕上がり、メッキ処理前の成形品の表面形状が鏡面状であれば、メッキ処理後の表面形状も鏡面状に仕上がる。   What is applied to the ring cover 210 is thin plating that shows the surface shape of the molded product as a base as it is. In the thin plating, for example, the thickness of the copper layer is about 3 to 5 μm, the thickness of the nickel layer is about 5 μm, and the thickness of the chromium layer is about 0.2 μm. As a result, if the surface shape of the molded product before the plating process is a satin finish, the surface shape after the plating process is also finished in a satin finish, and if the surface shape of the molded product before the plating process is a mirror surface, after the plating process The surface shape of the mirror is also finished in a mirror shape.

上述した各メッキ層は、アンカーホール内部にも形成されるので、アンカーホール内部に形成された各メッキ層が、成形品の表面に形成された各メッキ層の剥離を防止するアンカーとしての効果（以下、アンカー効果と呼ぶ）を生じさせる。   Since each plating layer described above is also formed inside the anchor hole, each plating layer formed inside the anchor hole is effective as an anchor that prevents peeling of each plating layer formed on the surface of the molded product ( Hereinafter, this will be referred to as an anchor effect).

−−−従来の射出成形用金型の問題点−−−
リングカバー２１０の鏡面仕上げ部２１１および梨地仕上げ部２１２のように、表面の仕上げ状態の異なる面を有する樹脂成形品にメッキを施すと、表面の仕上げ状態が変化する境界面の近傍でメッキの密着不良が発生しやすい。その原因としては、以下の点が考えられている。 ---- Problems of conventional injection molds ---
When plating is applied to a resin molded product having a surface with a different surface finish, such as the mirror finish portion 211 and the satin finish portion 212 of the ring cover 210, the plating adheres in the vicinity of the boundary surface where the surface finish state changes. Defects are likely to occur. The following points are considered as the cause.

樹脂成形品の形状が変化するコーナー部分に表面の仕上げ状態が変化する境界面が存在する場合、キャビティの内部の空気や溶融樹脂から発生するガス（以下、単にガスと呼ぶ）がこのコーナー部分に溜まりやすい。そのため、いわゆるガス焼けや、樹脂に対するガスの巻き込みが生じる。   When there is a boundary where the surface finish changes at the corner where the shape of the resin molded product changes, gas generated from the air inside the cavity or from the molten resin (hereinafter simply referred to as gas) is present at this corner. Easy to collect. For this reason, so-called gas burning and gas entrainment to the resin occur.

ガス焼けが生じた部分は樹脂の変質が起こるため、メッキ処理におけるエッチング液のアタック力が弱くなり、アンカーホールが生成されにくくなる。そのため、上述したアンカー効果が弱くなる。ガスの巻き込みが生じると、ブタジエンゴム粒子の分散状態が変化して、ブタジエンゴム粒子の存在しないＡＳリッチ層が生じてしまう。ＡＳリッチ層では、エッチングを行ってもアンカーホールが生成されないため、アンカー効果が得られない。   Since the resin is altered in the portion where the gas burn has occurred, the attack force of the etching solution in the plating process is weakened, and anchor holes are hardly generated. Therefore, the anchor effect mentioned above becomes weak. When gas entrainment occurs, the dispersion state of the butadiene rubber particles changes, and an AS-rich layer without butadiene rubber particles is generated. In the AS rich layer, an anchor effect is not obtained because an anchor hole is not generated even if etching is performed.

梨地面から鏡面へと表面の仕上げ状態が変化する境界面では、溶融したＡＢＳ樹脂の流速が増大するため、ブタジエンゴム粒子の配向が樹脂の流動方向に引き延ばされる。そのため、アンカーホールの形状が扁平形状に引き伸ばされ、その深さも浅くなるので、アンカー効果が弱くなる。   Since the flow rate of the molten ABS resin increases at the interface where the surface finish changes from the satin surface to the mirror surface, the orientation of the butadiene rubber particles is extended in the resin flow direction. Therefore, the shape of the anchor hole is stretched to a flat shape, and the depth is also shallow, so the anchor effect is weakened.

そこで、本実施の形態の射出成形用金型では、以下のように構成することで、上述した問題を解消するようにしている。   In view of this, the injection mold according to the present embodiment is configured as follows to solve the above-described problems.

−−−射出成形用金型について−−−
図３は、メッキ処理前のリングカバー２１０を成形するための射出成形用金型の断面を模式的に示した図である。射出成形用金型３は、キャビティ型３０とコア型３３とを備えている。キャビティ型３０は、第１キャビティ型３１と、第２キャビティ型３２とに分割可能に構成されている。なお、図３では、溶融樹脂を流し込むためのゲートなどの記載を省略している。 ---- About mold for injection molding ---
FIG. 3 is a diagram schematically showing a cross section of an injection mold for molding the ring cover 210 before plating. The injection mold 3 includes a cavity mold 30 and a core mold 33. The cavity mold 30 is configured to be divided into a first cavity mold 31 and a second cavity mold 32. In FIG. 3, the description of a gate for pouring the molten resin is omitted.

第１キャビティ型３１と、第２キャビティ型３２と、コア型３３とによって、溶融樹脂が充填される空間であるキャビティ３０１が形成される。キャビティ３０１は、第１キャビティ型３１側の第１キャビティ３０２と、第２キャビティ型３２側の第２キャビティ３０３とから構成されている。   The first cavity mold 31, the second cavity mold 32, and the core mold 33 form a cavity 301 that is a space filled with molten resin. The cavity 301 includes a first cavity 302 on the first cavity mold 31 side and a second cavity 303 on the second cavity mold 32 side.

第１キャビティ型３１は、第１キャビティ３０２を形成する第１キャビティ面３１１と、第２キャビティ型３２との当接する平面である当接面３１２とを有する。キャビティ面３１１は、リングカバー２１０の鏡面仕上げ部２１１に形状が転写される面であり、鏡面状に仕上げられている。   The first cavity mold 31 has a first cavity surface 311 that forms the first cavity 302, and a contact surface 312 that is a flat surface that contacts the second cavity mold 32. The cavity surface 311 is a surface on which the shape is transferred to the mirror finish part 211 of the ring cover 210, and is finished in a mirror shape.

第２キャビティ型３２は、第２キャビティ３０３を形成する第２キャビティ面３２１と、第１キャビティ型３１の当接面３１２と当接する平面である当接面３２２と、エアベント３２３とを有する。第２キャビティ面３２１は、リングカバー２１０の梨地仕上げ部２１２に形状が転写される面であり、梨地状に仕上げられている。梨地仕上げ部２１２を梨地状に加工する方法については後述する。なお、第１キャビティ面３１１と第２キャビティ面３２１とでは、テーパ面の傾斜角度が異なっている。すなわち、当接面３１２，３２２を境に、第１キャビティ面３１１と第２キャビティ面３２１とでは、表面の仕上げ状態と形状（テーパ面の傾斜角度）とが変化している。   The second cavity mold 32 includes a second cavity surface 321 that forms the second cavity 303, a contact surface 322 that is a plane that contacts the contact surface 312 of the first cavity mold 31, and an air vent 323. The second cavity surface 321 is a surface on which the shape is transferred to the matte finish portion 212 of the ring cover 210, and is finished in a satin finish. A method for processing the satin finish portion 212 into a satin finish will be described later. The first cavity surface 311 and the second cavity surface 321 have different inclination angles of the taper surface. That is, the surface finish state and the shape (inclination angle of the taper surface) change between the first cavity surface 311 and the second cavity surface 321 with the contact surfaces 312 and 322 as a boundary.

図３，４に示すように、エアベント３２３は、第２キャビティ型３２の内面である第２キャビティ面３２１から第２キャビティ型３２の外周面３２４に至る溝状の部位であり、当接面３２２に、第２キャビティ型３２の中心から放射状に３箇所設けられている。エアベント３２３の幅Ｗは数mm〜１０ｍｍ程度であり、深さＤは８〜１０μｍ程度である。   As shown in FIGS. 3 and 4, the air vent 323 is a groove-like portion from the second cavity surface 321, which is the inner surface of the second cavity mold 32, to the outer peripheral surface 324 of the second cavity mold 32, and the contact surface 322. Further, three locations are provided radially from the center of the second cavity mold 32. The width W of the air vent 323 is about several mm to 10 mm, and the depth D is about 8 to 10 μm.

コア型３３は、キャビティ型３０の内側に配設されて、キャビティ３０１の内周面を構成する。   The core mold 33 is disposed inside the cavity mold 30 and constitutes the inner peripheral surface of the cavity 301.

−−−梨地仕上げ部２１２について−−−
梨地仕上げ部２１２は、ブラスト加工などの表面処理加工によって梨地状に仕上げられている。すなわち、梨地状に加工される前の梨地仕上げ部２１２に対して、研磨材などを衝突させて表面に細かな凹凸面を形成することで、梨地状に仕上げている。なお、たとえば、ステンレス系のプラスチック金型鋼を用いて第２キャビティ型３２を作製し、梨地状に加工される前の梨地仕上げ部２１２に対して、研磨材に鉄粉だけを用いた場合、加工面には鋭利なエッジが多数存在した状態となる。鋭利なエッジが多数存在していると溶融樹脂の流動抵抗が大きくなるため、梨地面から鏡面へと表面の仕上げ状態が変化する境界面で溶融樹脂の流速が大きく増大するため、上述したようにアンカー効果の低下を招く。 --- About the satin finish part 212 ---
The satin finish portion 212 is finished in a satin finish by surface treatment such as blasting. That is, it is finished in a satin finish by colliding with an abrasive or the like to form a fine uneven surface on the surface of the satin finish portion 212 before being processed into a satin finish. In addition, for example, when the second cavity mold 32 is manufactured using a stainless plastic mold steel, and only the iron powder is used as an abrasive for the satin finish portion 212 before being processed into a satin finish, Many sharp edges exist on the surface. When there are many sharp edges, the flow resistance of the molten resin increases, and the flow velocity of the molten resin greatly increases at the boundary surface where the surface finish state changes from the matte surface to the mirror surface. The anchor effect is reduced.

そこで、本実施の形態の第２キャビティ型３２では、梨地状に加工される前の梨地仕上げ部２１２に対して、鉄粉を用いてブラスト加工を行った後、ガラスビーズなどを用いて再度ブラスト加工を行っている。これにより、研磨材に鉄粉を用いてブラスト加工を行った際に加工面に発生する鋭利なエッジを除去することができ、梨地表面を形成する凹凸面は滑らかとなる。   Therefore, in the second cavity mold 32 according to the present embodiment, after blasting using iron powder is performed on the satin finish portion 212 before being processed into a satin finish, blasting is again performed using glass beads or the like. Processing is in progress. Thereby, the sharp edge which generate | occur | produces in a processed surface when performing blasting using iron powder for an abrasives can be removed, and the uneven surface which forms a satin surface becomes smooth.

このように構成される射出成形用金型３を用いて射出成形を行うと、不図示のゲートから溶融樹脂がキャビティ３０１に充填される際に、ガスがエアベント３２３から外部に逃げる。なお、エアベント３２３が上述した幅Ｗおよび深さＤとされているので、ガスはエアベント３２３から外部に逃げることができるが、溶融樹脂はエアベント３２３から外部に漏れることはない。   When injection molding is performed using the injection mold 3 configured as described above, gas escapes from the air vent 323 to the outside when the molten resin is filled into the cavity 301 from a gate (not shown). Since the air vent 323 has the above-described width W and depth D, the gas can escape from the air vent 323 to the outside, but the molten resin does not leak from the air vent 323 to the outside.

なお、当接面３１２，３２２を境に、第１キャビティ面３１１と第２キャビティ面３２１とでは形状、すなわちテーパ面角度が変化しているが、上述したように、このように形状が変化するコーナー部分にガスが溜まりやすい。しかし、本実施の形態の射出成形用金型３では、ガスが溜まりやすい部分にガスベント３２３を設けているので、ガスを効率よく排気できる。   The first cavity surface 311 and the second cavity surface 321 change in shape, that is, the taper surface angle, with the contact surfaces 312 and 322 as a boundary. As described above, the shape changes in this way. Gas tends to accumulate in the corner. However, in the injection mold 3 of the present embodiment, the gas vent 323 is provided in the portion where the gas tends to accumulate, so that the gas can be efficiently exhausted.

また、エアベント３２３は、キャビティ型３０の分割面である第１キャビティ型３１と第２キャビティ型３２との当接面３１２，３２２に設けられているので、エアベント３２３の加工がし易い。   Further, since the air vent 323 is provided on the contact surfaces 312 and 322 of the first cavity mold 31 and the second cavity mold 32 which are the split surfaces of the cavity mold 30, the air vent 323 can be easily processed.

梨地仕上げ部２１２は、上述した鋭利なエッジが除去されているので、梨地仕上げ部２１２における溶融樹脂の流動抵抗が抑制される。その結果、上述したような従来の射出成形用金型で生じていた問題点を解消できる。   Since the sharp edge mentioned above is removed from the matte finish part 212, the flow resistance of the molten resin in the satin finish part 212 is suppressed. As a result, it is possible to solve the problems that have occurred in the conventional injection mold as described above.

上述した実施の形態では、次の作用効果を奏する。
（１） 表面の仕上げ状態が変化する当接面３１２，３２２を境に、第１キャビティ型３１と、第２キャビティ型３２とに分割可能に構成した。これにより、分割面からガスを排気できるので、ガスに起因する成形品のメッキ密着不良を抑止できる。したがって、表面状態が良好な成形品を得ることができる。
（２） 当接面３２２にエアベント３２３を設けるように構成した。これにより、ガスを積極的に外部に排気できるので、成形品に対するメッキの密着不良によるリングカバー２１０の不良を低減できる。
（３） 梨地仕上げ部２１２は、上述した鋭利なエッジを除去しているので、梨地仕上げ部２１２における溶融樹脂の流動抵抗が抑制され、成形品表面のアンカーホールの形状変化を抑制できる。これにより、アンカー効果が向上して成形品に対するメッキの密着力が向上するので、リングカバー２１０の品質を向上できる。
（４） 上述した射出成形用金型３によって射出成形を行った成形品を用いてリングカバー２１０を製作しているので、リングカバー２１０のメッキの耐久性が向上する。これにより、カメラ１の品質を向上できる。 The embodiment described above has the following operational effects.
(1) The first cavity mold 31 and the second cavity mold 32 can be divided at the contact surfaces 312 and 322 whose surface finish state changes. Thereby, since gas can be exhausted from a division surface, plating adhesion failure of a molded product resulting from gas can be controlled. Therefore, a molded product having a good surface state can be obtained.
(2) An air vent 323 is provided on the contact surface 322. As a result, the gas can be actively exhausted to the outside, so that the defect of the ring cover 210 due to the poor adhesion of the plating to the molded product can be reduced.
(3) Since the satin finish portion 212 removes the sharp edges described above, the flow resistance of the molten resin in the satin finish portion 212 is suppressed, and the shape change of the anchor hole on the surface of the molded product can be suppressed. Thereby, since the anchor effect is improved and the adhesion of the plating to the molded product is improved, the quality of the ring cover 210 can be improved.
(4) Since the ring cover 210 is manufactured using a molded product that has been injection-molded by the injection mold 3 described above, the durability of plating of the ring cover 210 is improved. Thereby, the quality of the camera 1 can be improved.

−−−変形例−−−
（１） 上述の説明では、梨地状に加工される前の第２キャビティ型３２の梨地仕上げ部２１２に対して、鉄粉を用いてブラスト加工を行った後、ガラスビーズなどを用いて再度ブラスト加工を行っているが、本発明はこれに限定されない。ブラスト加工によって加工面に発生する鋭利なエッジを除去することができれば、または、上述した鋭利なエッジがはじめから加工面に生じなければ、研磨材の材質は上述した鉄粉およびガラスビーズに限らない。すなわち、結果として梨地表面を形成する凹凸面が滑らかとなればよい。また、研磨材の材質だけでなく、研磨材の粒子の大きさや形状、ブラスト加工時の加工圧力や連続噴射時間といった加工条件などを適宜変更すること、梨地表面を形成する凹凸面を滑らかにするようにしてもよい。さらに、ブラスト加工に限らず、化学研磨や電解研磨などの方法によって、梨地表面を形成する凹凸面を滑らかにするようにしてもよい。 ---- Modified example ---
(1) In the above description, blasting is performed using iron powder on the satin finish portion 212 of the second cavity mold 32 before being processed into a satin finish, and then blasting again using glass beads or the like. Although processing is performed, the present invention is not limited to this. The abrasive material is not limited to the above-described iron powder and glass beads as long as the sharp edge generated on the processed surface can be removed by blasting or if the above-described sharp edge does not occur on the processed surface from the beginning. . That is, as a result, the uneven surface forming the matte surface may be smooth. Also, not only the abrasive material, but also the abrasive particle size and shape, processing conditions such as processing pressure during blasting and continuous spraying time, etc. are changed as appropriate, and the uneven surface forming the matte surface is smoothed. You may do it. Further, not only the blasting process, but also the uneven surface forming the satin surface may be smoothed by a method such as chemical polishing or electrolytic polishing.

（２） 上述の説明では、リングカバー２１０をＡＢＳ樹脂で成形しているが、ＡＢＳ樹脂に限らず、熱可塑性の樹脂相にゴム相を分散させた他の種類の樹脂であってもよい。
（３） 上述した各実施の形態および変形例は、それぞれ組み合わせてもよい。 (2) In the above description, the ring cover 210 is formed of ABS resin, but is not limited to ABS resin, but may be other types of resin in which a rubber phase is dispersed in a thermoplastic resin phase.
(3) You may combine each embodiment and the modification which were mentioned above, respectively.

なお、本発明は、上述した実施の形態のものに何ら限定されず、第１の平面と、第１の平面とは表面形状が異なる第２の平面との境界部分で、第１の平面を有する第１キャビティと第２の平面を有する第２キャビティとに分割したキャビティを有する射出成形用金型や、この射出成形用金型で成形された成形品、この成形品を用いたカメラなど、各種のものを含むものである。   In addition, this invention is not limited to the thing of embodiment mentioned above at all, A 1st plane is a boundary part of a 2nd plane from which a surface shape differs from a 1st plane, and a 1st plane is set as a 1st plane. An injection mold having a cavity divided into a first cavity having a second cavity and a second cavity having a second plane, a molded article molded with this injection mold, a camera using this molded article, etc. It includes various things.

カメラの前部カバーおよび内部構造を示す図である。It is a figure which shows the front part cover and internal structure of a camera. リングカバー２１０の側面図である。4 is a side view of a ring cover 210. FIG. 射出成形用金型３の断面を模式的に示した図である。It is the figure which showed typically the cross section of the metal mold | die 3 for injection molding. 図３のＩＶ−ＩＶ矢視図である。It is the IV-IV arrow line view of FIG.

符号の説明Explanation of symbols

１ カメラ ３ 射出成形用金型
３０ キャビティ型 ３１ 第１キャビティ型
３２ 第２キャビティ型 ２１０ リングカバー
２１１ 鏡面仕上げ部 ２１２ 梨地仕上げ部
３１１ 第１キャビティ面 ３２１ 第２キャビティ面
３２３ エアベント DESCRIPTION OF SYMBOLS 1 Camera 3 Injection mold 30 Cavity mold 31 1st cavity mold 32 2nd cavity mold 210 Ring cover 211 Mirror surface finish part 212 Pear finish part 311 1st cavity surface 321 2nd cavity surface 323 Air vent

Claims (7)

第１の平面と、前記第１の平面とは形状が異なる第２の平面とを有する、成形品を射出成形するための射出成形用金型であって、
前記第１の平面と前記第２の平面との境界部分で、前記第１の平面を有する第１キャビティと前記第２の平面を有する第２キャビティとに分割したキャビティを備えることを特徴とする射出成形用金型。 An injection mold for injection-molding a molded product having a first plane and a second plane having a shape different from that of the first plane,
A cavity divided into a first cavity having the first plane and a second cavity having the second plane at a boundary portion between the first plane and the second plane is provided. Injection mold. 請求項１に記載の射出成形用金型において、
前記第１キャビティと第２キャビティとの分割面の少なくとも一方には、金型内部の気体を外部に逃がすための隙間を設けたことを特徴とする射出成形用金型。 In the injection mold according to claim 1,
A mold for injection molding, characterized in that at least one of the dividing surfaces of the first cavity and the second cavity is provided with a gap for allowing gas inside the mold to escape to the outside. 請求項１または請求項２に記載の射出成形用金型において、
前記第２の平面は、梨地状に仕上げられた梨地表面を形成する凹凸面は滑らかであることを特徴とする射出成形用金型。 The injection mold according to claim 1 or 2,
The mold for injection molding, wherein the second flat surface has a smooth uneven surface forming a satin finish finished in a satin finish. 請求項１〜３のいずれか一項に記載した射出成形用金型を用いて成形したことを特徴とする成形品。   A molded product, which is molded using the injection mold according to any one of claims 1 to 3. 請求項４に記載の成形品において、
前記第１の平面と前記第２の平面とがメッキ加工されていることを特徴とする成形品。 In the molded product according to claim 4,
The molded product, wherein the first plane and the second plane are plated. 請求項４または請求項５に記載の成形品において、
ＡＢＳ樹脂を用いて成形したことを特徴とする成形品。 In the molded product according to claim 4 or 5,
Molded product characterized by molding using ABS resin. 請求項４〜６のいずれか一項に記載の成形品を外装用部品として用いることを特徴とするカメラ。   A camera using the molded product according to any one of claims 4 to 6 as an exterior part.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200464858Y1 (en) * 2008-08-06 2013-01-21 엘지이노텍 주식회사 Camera holder
JP2015142970A (en) * 2014-01-31 2015-08-06 豊田合成株式会社 Resin injection molding die and method for producing resin molded product
JP2015142968A (en) * 2014-01-31 2015-08-06 豊田合成株式会社 Resin injection molding die and method for producing resin molded product

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JPH09140485A (en) * 1995-11-29 1997-06-03 Matsushita Electric Ind Co Ltd Case body
JPH11245252A (en) * 1998-02-27 1999-09-14 Asahi Chem Ind Co Ltd Method for injection-molding of amorphous resin

Patent Citations (2)

* Cited by examiner, † Cited by third party
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JPH09140485A (en) * 1995-11-29 1997-06-03 Matsushita Electric Ind Co Ltd Case body
JPH11245252A (en) * 1998-02-27 1999-09-14 Asahi Chem Ind Co Ltd Method for injection-molding of amorphous resin

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200464858Y1 (en) * 2008-08-06 2013-01-21 엘지이노텍 주식회사 Camera holder
JP2015142970A (en) * 2014-01-31 2015-08-06 豊田合成株式会社 Resin injection molding die and method for producing resin molded product
JP2015142968A (en) * 2014-01-31 2015-08-06 豊田合成株式会社 Resin injection molding die and method for producing resin molded product

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