JP2007121891A - Resin cam barrel and mold device for injection molding for manufacturing the same - Google Patents

Resin cam barrel and mold device for injection molding for manufacturing the same Download PDF

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JP2007121891A
JP2007121891A JP2005316852A JP2005316852A JP2007121891A JP 2007121891 A JP2007121891 A JP 2007121891A JP 2005316852 A JP2005316852 A JP 2005316852A JP 2005316852 A JP2005316852 A JP 2005316852A JP 2007121891 A JP2007121891 A JP 2007121891A
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mold
cam
side wall
extending direction
cam groove
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Yoichi Iijima
洋一 飯島
Akira Hayashi
昭 林
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Fujinon Sano Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin cam barrel which has two cam grooves separated from each other in the extension direction of a central shaft, the grooves capable of accurately transmitting a desired motion to a follower and which can be made compact as a whole, and to provide a mold device for injection molding for integrally molding such a resin cam barrel. <P>SOLUTION: A first mold device 10 which molds a first cam barrel 1 is provided with a first mold 11, a second mold 12 and a third mold 13. The first mold 11 is constituted so as to form an inner side wall surface 3q of a first cam groove 3, and the second mold 12 is constituted so as to form an inner side wall surface 4q of a second cam groove 4. The third mold 13 consists of three pieces of separate molds 13a to 13c which are separated from one another upon mold opening and are movable outward in the radial direction of a barrel part 2 and is constituted so as to form outer side wall surfaces 3p, 4p of first and second cam grooves 3, 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、ビデオカメラやスチルカメラ等の各種カメラにおいて、ズーミング時等におけるレンズの移動量を規制するために、鏡筒内に配置される樹脂製カム筒の製造技術に関するものであり、特に、カム筒の中心軸方向に離間して形成される２つのカム溝を備えた樹脂製カム筒およびこれを製造するための射出成形用金型装置に関する。   The present invention relates to a technology for manufacturing a resin cam cylinder disposed in a lens barrel in order to regulate the amount of movement of a lens during zooming in various cameras such as a video camera and a still camera. The present invention relates to a resin cam cylinder provided with two cam grooves formed apart from each other in the central axis direction of the cam cylinder, and an injection mold apparatus for manufacturing the resin cam cylinder.

カム筒のカム溝により運動が伝達される従節は、レンズ枠に立設された円柱状のピン部材とされることが一般的である。このようなピン部材に高精度に運動を伝達するためには、カム溝を構成する両側壁面が、カム溝の幅の中心線上の各点からカム筒の中心軸（通常、カム筒内に保持されるレンズの光軸と一致する）に下ろした各垂線の集合からなる曲面と略平行となるように形成されることが望ましいとされている。   The follower to which the motion is transmitted by the cam groove of the cam cylinder is generally a columnar pin member erected on the lens frame. In order to transmit motion to such a pin member with high accuracy, both side wall surfaces constituting the cam groove are held on the center axis of the cam cylinder (usually held in the cam cylinder from each point on the center line of the cam groove width). It is desirable that it be formed so as to be substantially parallel to a curved surface made up of a set of perpendicular lines (which coincide with the optical axis of the lens).

しかし、このようなカム溝においては、カム筒の任意の径方向に対して少なくとも一方の側壁面がアンダカットとなってしまうので、カム溝の両側壁面を１つの金型により形成し、その金型をカム筒の径方向に離型するという手法を採ることができない。   However, in such a cam groove, since at least one side wall surface is undercut with respect to an arbitrary radial direction of the cam cylinder, both side wall surfaces of the cam groove are formed by one mold, and the mold The technique of releasing the mold in the radial direction of the cam cylinder cannot be taken.

従来、このような事情に鑑み、１つのカム溝の両側壁面を、それぞれ別の金型を用いて成形することにより、カム筒全体を一体成形する技術が提案されている（下記特許文献１、２参照）。   Conventionally, in view of such circumstances, there has been proposed a technique for integrally forming the entire cam cylinder by forming both side wall surfaces of one cam groove using different molds (Patent Document 1, the following Patent Document 1). 2).

下記特許文献１に記載されたものは、１つのカム溝の両側壁面をそれぞれ形成する内金型と外金型との分割面を、カム溝内において斜めに設けるようにしている。   In the one described in Patent Document 1 below, the divided surfaces of the inner mold and the outer mold that respectively form both side walls of one cam groove are provided obliquely in the cam groove.

一方、下記特許文献２に記載されたものは、カム筒の中心軸の延伸方向に離間させて２つのカム溝を形成する技術に関するものであり、１つのカム溝の両側壁面をそれぞれ形成する内金型と外金型とを、カム筒の中心軸の延伸方向に分離するように構成するとともに、２つのカム溝の各形成位置においてカム筒の径方向に肉厚分の段差を設け、カム筒の径が中心軸の延伸方向に沿って順々に小さくなるようにしている。   On the other hand, what is described in Patent Document 2 below relates to a technique for forming two cam grooves by separating them in the extending direction of the central axis of the cam cylinder. The mold and the outer mold are configured so as to be separated in the extending direction of the central axis of the cam cylinder, and a cam is provided in the radial direction of the cam cylinder at each formation position of the two cam grooves, The diameter of the cylinder is made smaller in order along the extending direction of the central axis.

特開２００１−３３６６０７号公報JP 2001-336607 A 特開昭６３−５３０２１号公報JP-A-63-53021

しかしながら、上記特許文献１に記載されたものは、内金型の構成が非常に複雑となるので、中心軸方向に離間した２つのカム溝を形成する構成を採ることが難しいという問題がある。また、内金型と外金型との分割面の精度を高めることが難しく、カム溝を高精度に形成することが困難である。このため、形成されたカム溝によっては、従節に所期の運動を高精度に伝えることができない虞がある。   However, the one described in Patent Document 1 has a problem that it is difficult to adopt a configuration in which two cam grooves spaced apart in the central axis direction are formed because the configuration of the inner mold becomes very complicated. In addition, it is difficult to increase the accuracy of the dividing surface between the inner mold and the outer mold, and it is difficult to form the cam groove with high accuracy. For this reason, depending on the formed cam groove, there is a possibility that the desired motion cannot be transmitted to the follower with high accuracy.

また、上記特許文献２に記載されたものは、中心軸方向に離間した２つのカム溝を形成することは可能であるが、カム筒の径が中心軸の延伸方向に沿って順々に小さくなるように構成されているので、カム筒において内径が最も小さい部分と最も外径が大きくなる部分との差が、カム筒の肉厚分の少なくとも６倍（半径換算で３倍）は必要となり、カム筒全体としての径が大きくなってしまうという問題がある。   In addition, the one described in Patent Document 2 can form two cam grooves separated in the central axis direction, but the diameter of the cam cylinder is gradually reduced along the extending direction of the central axis. Therefore, the difference between the smallest inner diameter portion and the largest outer diameter portion of the cam cylinder must be at least six times the wall thickness of the cam cylinder (three times in terms of radius). There is a problem that the diameter of the entire cam cylinder is increased.

本発明は、このような事情に鑑みなされたものであり、中心軸の延伸方向に離間した２つのカム溝により、従節に所期の運動を高精度に伝達することが可能で、かつカム筒全体の小径化を図ることが可能な樹脂性カム筒、およびこのような樹脂性カム筒を一体成形し得る射出成形用金型装置を提供することを目的とする。   The present invention has been made in view of such circumstances, and it is possible to transmit the desired motion to the follower with high accuracy by two cam grooves separated in the extending direction of the central axis, and the cam. It is an object of the present invention to provide a resin cam cylinder capable of reducing the diameter of the entire cylinder, and an injection mold apparatus capable of integrally molding such a resin cam cylinder.

本発明に係る樹脂製カム筒は、円筒状の筒部に、該筒部の中心軸の延伸方向に互いに離間した第１および第２のカム溝が形成されてなる樹脂製のカム筒であって、
前記筒部において、前記延伸方向の中間部分に位置する中間部領域は、該中間部領域の前記延伸方向両側にそれぞれ位置する第１および第２の端部領域よりも、内径が小さく形成されており、
前記第１のカム溝は、前記中間部領域と前記第１の端部領域との境界に沿って配置され、該第１のカム溝の両側壁面のうち、前記延伸方向外側に位置する外側の側壁面は、前記第１の端部領域の縁に形成され、前記中心軸の延伸方向内側に位置する内側の側壁面は、前記中間部領域の縁に形成され、該第１のカム溝における前記外側および内側の側壁面は、該第１のカム溝の幅の中心線上の各点から前記中心軸に下ろした各垂線の集合からなる曲面とそれぞれ略平行となるように形成されており、
前記第２のカム溝は、前記中間部領域と前記第２の端部領域との境界に沿って配置され、該第２のカム溝の両側壁面のうち、前記延伸方向外側に位置する外側の側壁面は、前記第２の端部領域の縁に形成され、前記中心軸の延伸方向内側に位置する内側の側壁面は、前記中間部領域の縁に形成され、該第２のカム溝における前記外側および内側の側壁面は、該第２のカム溝の幅の中心線上の各点から前記中心軸に下ろした各垂線の集合からなる曲面とそれぞれ略平行となるように形成されている、ことを特徴とする。 The resin cam cylinder according to the present invention is a resin cam cylinder in which first and second cam grooves spaced apart from each other in the extending direction of the central axis of the cylindrical portion are formed in the cylindrical cylindrical portion. And
In the cylindrical portion, the intermediate region located at the intermediate portion in the extending direction has a smaller inner diameter than the first and second end regions positioned on both sides of the intermediate region in the extending direction. And
The first cam groove is disposed along a boundary between the intermediate region and the first end region, and is located on an outer side located on the outer side in the extending direction among both side wall surfaces of the first cam groove. A side wall surface is formed at an edge of the first end region, and an inner side wall surface located on the inner side in the extending direction of the central axis is formed at an edge of the intermediate region, and in the first cam groove The outer and inner side wall surfaces are formed so as to be substantially parallel to a curved surface formed by a set of perpendiculars extending from the respective points on the central line of the width of the first cam groove to the central axis,
The second cam groove is disposed along a boundary between the intermediate region and the second end region, and is located on an outer side located on the outer side in the extending direction among both side wall surfaces of the second cam groove. A side wall surface is formed at an edge of the second end region, and an inner side wall surface located inside the extending direction of the central axis is formed at an edge of the intermediate region, and the second cam groove The outer and inner side wall surfaces are formed so as to be substantially parallel to a curved surface formed by a set of perpendiculars extending from the respective points on the central line of the width of the second cam groove to the central axis. It is characterized by that.

本発明による樹脂製カム筒において、第１および第２のカム溝は、筒部の周方向に互いに離間して配置された複数の溝孔によりそれぞれ構成されたものとすることができる。   In the resin cam cylinder according to the present invention, the first and second cam grooves may be configured by a plurality of groove holes that are spaced apart from each other in the circumferential direction of the cylinder portion.

また、本発明に係る射出成形用金型装置は、本発明に係る樹脂製カム筒を製造するための射出成形用金型装置であって、
前記筒部の前記第１の端部領域の内周面と、前記第１のカム溝の前記内側の側壁面と、該中間部領域の内周面の一部を形成する第１金型と、
前記筒部の前記第２の端部領域の内周面と、前記第２のカム溝の前記内側の側壁面と、該中間部領域の内周面のその余の部分とを形成する第２金型と、
前記筒部の前記第１および第２の端部領域ならびに前記中間部領域の各外周面と、前記第１および第２のカム溝の各前記外側の側壁面とを形成する第３金型と、を備え、
前記第１金型および前記第２金型は、型開きの際に、前記延伸方向に互いに離間するように相対的に移動可能とされ、
前記第３金型は、前記型開きの際に、互いに分離して前記筒部の径方向外向きに移動可能な複数の分離金型からなる、ことを特徴とする。 An injection mold apparatus according to the present invention is an injection mold apparatus for manufacturing the resin cam cylinder according to the present invention,
An inner peripheral surface of the first end region of the tubular portion, an inner side wall surface of the first cam groove, and a first mold forming a part of the inner peripheral surface of the intermediate region; ,
A second forming the inner peripheral surface of the second end region of the cylindrical portion, the inner side wall surface of the second cam groove, and the remaining portion of the inner peripheral surface of the intermediate region. Mold,
A third mold for forming the outer peripheral surfaces of the first and second end regions and the intermediate region of the cylindrical portion and the outer side wall surfaces of the first and second cam grooves; With
The first mold and the second mold are relatively movable so as to be separated from each other in the extending direction when the mold is opened.
The third mold is characterized by comprising a plurality of separation molds that can be separated from each other and moved radially outward of the cylindrical portion when the mold is opened.

本発明による射出成形用金型装置において、分離金型は、第３金型における前記延伸方向の中間部分を構成する第１分離金型と、該中間部分の前記延伸方向両側の部分をそれぞれ構成する第２および第３分離金型とからなり、型開きの際には、まず第１分離金型が筒部の径方向外向きに移動し、次に第２および第３分離金型が前記延伸方向に互いに近づくように移動し、その後第２および第３分離金型が筒部の径方向外向きに移動するように構成されたものとすることができる。   In the mold apparatus for injection molding according to the present invention, the separation mold includes a first separation mold that constitutes an intermediate portion in the extending direction of the third mold, and portions on both sides of the intermediate portion in the extending direction. The first and second separation molds are moved outward in the radial direction of the cylindrical portion, and then the second and third separation molds are It can be configured to move so as to approach each other in the extending direction, and then the second and third separation molds move outward in the radial direction of the cylindrical portion.

本発明による樹脂製カム筒によれば、第１および第２のカム溝におけるそれぞれの両側壁面が、各カム溝の幅の中心線線上の各点からカム筒の中心軸に下ろした各垂線の集合からなる曲面と略平行となるように形成されているので、第１および第２のカム溝により、従節に所期の運動を高精度に伝達することが可能となる。   According to the resin cam cylinder of the present invention, the both side wall surfaces of the first and second cam grooves are perpendicular to the center axis of the cam groove from the respective points on the center line of the cam groove. Since the first and second cam grooves are formed so as to be substantially parallel to the curved surface formed by the set, it is possible to transmit the desired motion to the follower with high accuracy.

また、カム筒の筒部は、第１および第２のカム溝の間に位置する中間部領域が、この中間部領域の各外側に位置する第１および第２の端部領域よりも、内径が小さく形成された形状とされている。これにより、カム筒の内径が最も小さい部分と最も外径が大きくなる部分と差を、カム筒の肉厚分の４倍（半径換算で２倍）程度まで抑えることができるので、カム筒の径が中心軸の延伸方向に沿って順々に小さくなるものに比べて、カム筒全体を小型化することが可能となる。   In addition, the cylindrical portion of the cam cylinder has an inner region located between the first and second cam grooves, with an inner diameter larger than that of the first and second end regions located on the outer sides of the intermediate portion region. Is formed into a small shape. As a result, the difference between the smallest inner diameter portion and the largest outer diameter portion of the cam cylinder can be suppressed to about four times the wall thickness of the cam cylinder (twice the radius conversion). The entire cam barrel can be reduced in size as compared with the case where the diameter gradually decreases along the extending direction of the central axis.

一方、本発明による射出成形用金型装置によれば、上記構成を備えていることにより、本発明による樹脂製カム筒を高精度に射出成形することが可能となる。   On the other hand, according to the mold apparatus for injection molding according to the present invention, the resin cam cylinder according to the present invention can be injection-molded with high accuracy by having the above-described configuration.

以下、本発明の実施形態について図面を参照しつつ詳細に説明する。図１〜図５は、本発明に係る樹脂性カム筒の一実施形態を示すものであり、図１は斜視図、図２は周方向へ展開したものを外面側から見た図、図３は中心軸Ｚに沿った断面図、図４は図２におけるＡ−Ａ線に沿った断面図、図５は図２におけるＢ−Ｂ線に沿った断面図である。なお、図１〜図５において、各部の大きさや配置バランス等は、適宜変更して示してある。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 5 show an embodiment of a resin cam cylinder according to the present invention. FIG. 1 is a perspective view, FIG. 2 is a view of a circumferentially developed view, FIG. Is a sectional view taken along the central axis Z, FIG. 4 is a sectional view taken along the line AA in FIG. 2, and FIG. 5 is a sectional view taken along the line BB in FIG. In FIGS. 1 to 5, the size of each part, the arrangement balance, and the like are appropriately changed.

図１〜図５に示す樹脂性カム筒（以下「第１のカム筒」と称す）１は、ズームレンズを移動させるために鏡筒内に配置されるカメラ用のものであり、図１に示すように円筒状の筒部２に、その中心軸Ｚの延伸方向に互いに離間した第１および第２のカム溝３，４が形成されてなる。   A resin cam barrel (hereinafter referred to as a “first cam barrel”) 1 shown in FIGS. 1 to 5 is for a camera disposed in a lens barrel to move a zoom lens. As shown, the cylindrical tube portion 2 is formed with first and second cam grooves 3 and 4 that are separated from each other in the extending direction of the central axis Z.

図２に示すように第１および第２のカム溝３，４は、筒部２の周方向に互いに離間して配置された３個の溝孔３ａ〜３ｃおよび４ａ〜４ｃによりそれぞれ構成されている（図１では、溝孔３ｂ，４ｂは図示されていない）。なお、以下の説明において、各３個の溝孔３ａ〜３ｃおよび４ａ〜４ｃを互いに区別する必要がない場合は、溝孔３ａ〜３ｃ個々を第１のカム溝３と称し、溝孔４ａ〜４ｃ個々を第２のカム溝４と称する。   As shown in FIG. 2, the first and second cam grooves 3 and 4 are constituted by three groove holes 3 a to 3 c and 4 a to 4 c that are spaced apart from each other in the circumferential direction of the cylindrical portion 2. (The slots 3b and 4b are not shown in FIG. 1). In the following description, when it is not necessary to distinguish each of the three slots 3a to 3c and 4a to 4c from each other, each slot 3a to 3c is referred to as a first cam slot 3 and the slots 4a to 4c. Each 4c is referred to as a second cam groove 4.

図１に示すように筒部２は、中心軸Ｚの延伸方向の中間部分に位置する中間部領域２ａと、該中間部領域２ａの図中左右両側にそれぞれ位置する第１および第２の端部領域２ｂ，２ｃとに区分されている。図２に示すように中間部領域２ａと第１の端部領域２ｂとは、３個の溝孔３ａ〜３ｃの間を上記周方向にクランク状に延びる境界壁５により互いに連結されており、中間部領域２ａと第２の端部領域２ｃとは、３個の溝孔４ａ〜４ｃの間を上記周方向にクランク状に延びる境界壁６により互いに連結されている。また、図３に示すように中間部領域２ａは、その内径ｄ１が第１および第２の端部領域２ｂ，２ｃの内径ｄ２よりも、筒部２の肉厚ｔの略２倍分だけ小さく形成されている（ｄ２−ｄ１＝２ｔ）。これにより、第１のカム筒１においては、その内径が最も小さい部分と最も外径が大きくなる部分との差を、筒部２の肉厚分の４倍（半径換算で２倍）にまで抑えることが可能となっている。 As shown in FIG. 1, the cylindrical part 2 includes an intermediate part region 2a located in an intermediate part in the extending direction of the central axis Z, and first and second ends located on both the left and right sides of the intermediate part region 2a in the drawing. It is divided into partial areas 2b and 2c. As shown in FIG. 2, the intermediate region 2 a and the first end region 2 b are connected to each other by a boundary wall 5 extending in a crank shape in the circumferential direction between the three slots 3 a to 3 c, The middle region 2a and the second end region 2c are connected to each other by a boundary wall 6 extending in a crank shape in the circumferential direction between the three slots 4a to 4c. The intermediate region 2a as shown in FIG. 3, the inner diameter d 1 is the first and second end region 2b, than the inner diameter d 2 of 2c, approximately twice the thickness t of the cylindrical portion 2 It is formed as small as possible (d 2 −d 1 = 2t). As a result, in the first cam cylinder 1, the difference between the portion with the smallest inner diameter and the portion with the largest outer diameter is reduced to four times the wall thickness of the tube portion 2 (twice in terms of radius). It is possible to suppress.

図２に示すように第１のカム溝３は、中間部領域２ａと第１の端部領域２ｂとの境界に沿って配置されている。この第１のカム溝３の両側壁面３ｐ，３ｑのうち、中心軸Ｚの延伸方向外側に位置する外側の側壁面３ｐは、第１の端部領域２ｂの縁に形成され、中心軸Ｚの延伸方向内側に位置する内側の側壁面３ｑは、中間部領域２ａの縁に形成されている。また、第１のカム溝３の外側および内側の側壁面３ｐ，３ｑは、第１のカム溝３の幅の中心線ｗ１上の各点から中心軸Ｚに下ろした各垂線（図３に１つのみ例示）の集合からなる曲面とそれぞれ略平行となるように形成されている。 As shown in FIG. 2, the first cam groove 3 is arranged along the boundary between the intermediate region 2a and the first end region 2b. Out of the side wall surfaces 3p and 3q of the first cam groove 3, an outer side wall surface 3p located on the outer side in the extending direction of the central axis Z is formed at the edge of the first end region 2b. The inner side wall surface 3q located on the inner side in the extending direction is formed at the edge of the intermediate region 2a. The outer and inner wall surfaces of the first cam groove 3 3p, 3q, each perpendicular line to the central axis Z from each point on the center line w 1 of the width of the first cam groove 3 (Figure 3 Each of them is formed so as to be substantially parallel to a curved surface formed of a set of only one).

一方、第２のカム溝４は、図２に示すように、中間部領域２ａと第２の端部領域２ｃとの境界に沿って配置されている。この第２のカム溝４の両側壁面４ｐ，４ｑのうち、中心軸Ｚの延伸方向外側に位置する外側の側壁面４ｐは、第２の端部領域２ｃの縁に形成され、中心軸Ｚの延伸方向内側に位置する内側の側壁面４ｑは、中間部領域２ａの縁に形成されている。また、第２のカム溝４の外側および内側の側壁面４ｐ，４ｑは、第２のカム溝４の幅の中心線ｗ２上の各点から中心軸Ｚに下ろした各垂線（図３に１つのみ例示）の集合からなる曲面とそれぞれ略平行となるように形成されている。 On the other hand, as shown in FIG. 2, the second cam groove 4 is disposed along the boundary between the intermediate region 2a and the second end region 2c. Out of the side wall surfaces 4p and 4q of the second cam groove 4, the outer side wall surface 4p located on the outer side in the extending direction of the central axis Z is formed at the edge of the second end region 2c. The inner side wall surface 4q located on the inner side in the extending direction is formed at the edge of the intermediate region 2a. The outer and inner side wall surface of the second cam groove 4 4p, 4q, each perpendicular line to the central axis Z from each point on the center line w 2 of the width of the second cam groove 4 (Figure 3 Each of them is formed so as to be substantially parallel to a curved surface formed of a set of only one).

これにより第１のカム筒１は、レンズ枠に立設された円柱状のピン部材からなる従節（いずれも図示略）に対して、所期の運動を高精度に伝達することが可能となっている。   As a result, the first cam cylinder 1 can transmit a desired motion with high accuracy to a follower (both not shown) made of a cylindrical pin member erected on the lens frame. It has become.

次に、本発明に係る射出成形用金型装置の実施形態について説明する。図６〜図９は、本発明に係る射出成形用金型装置の第１実施形態を示すものであり、図６は型開き時の斜視図、図７は型締め時の断面図、図８は型締め時の正面図、図９は型締め時の左側面図である。なお、図６〜図９において、各部の大きさや配置バランス等は、適宜変更して示してある。   Next, an embodiment of an injection mold apparatus according to the present invention will be described. 6 to 9 show a first embodiment of an injection mold apparatus according to the present invention. FIG. 6 is a perspective view when the mold is opened, FIG. 7 is a cross-sectional view when the mold is clamped, and FIG. Is a front view during mold clamping, and FIG. 9 is a left side view during mold clamping. 6 to 9, the size of each part, the arrangement balance, and the like are appropriately changed.

図６〜図９に示す射出成形用金型装置（以下「第１の金型装置」と称す）１０は、上述した第１のカム筒１を射出成形するものであって、第１金型１１、第２金型１２、および第３金型１３を備えてなる。   An injection mold apparatus (hereinafter referred to as “first mold apparatus”) 10 shown in FIGS. 6 to 9 is for injection-molding the first cam cylinder 1 described above. 11, a second mold 12, and a third mold 13.

図６に示すように第１金型１１は、それぞれ円柱状をなす大径部１１ａと小径部１１ｂとからなり、小径部１１ｂにはキャビティ側面１１ｃ〜１１ｅが設けられている。キャビティ側面１１ｃは、小径部１１ｂの外周面の、大径部１１ａに近い側に設けられており、上記筒部２の第１の端部領域２ｂの内周面を形成するように構成されている。キャビティ側面１１ｄは、小径部１１ｂの外周面の、大径部１１ａから離れた側において、キャビティ側面１１ｃよりも一段低く彫り下げられたように設けられており、上記中間部領域２ａの内周面の略半分（中心軸Ｚの延伸方向中央部から図中左側の部分）を形成するように構成されている。また、キャビティ側面１１ｅは、キャビティ側面１１ｃとキャビティ側面１１ｄとの段差部に設けられており、上記第１のカム溝３の内側の側壁面３ｑ、および上記境界壁５の一側面（筒部２の内周面側に位置する側面）を形成するように構成されている。   As shown in FIG. 6, the 1st metal mold | die 11 consists of the large diameter part 11a and the small diameter part 11b which make a column shape, respectively, The cavity side surfaces 11c-11e are provided in the small diameter part 11b. The cavity side surface 11c is provided on the side near the large diameter portion 11a of the outer peripheral surface of the small diameter portion 11b, and is configured to form an inner peripheral surface of the first end region 2b of the cylindrical portion 2. Yes. The cavity side surface 11d is provided so as to be carved one step lower than the cavity side surface 11c on the side of the outer peripheral surface of the small diameter portion 11b away from the large diameter portion 11a, and the inner peripheral surface of the intermediate region 2a. Is formed so as to form approximately half of the center portion (the portion on the left side in the drawing from the center in the extending direction of the central axis Z). The cavity side surface 11e is provided at a step portion between the cavity side surface 11c and the cavity side surface 11d, and the side wall surface 3q inside the first cam groove 3 and one side surface of the boundary wall 5 (tubular portion 2). The side surface located on the inner peripheral surface side) is formed.

図６に示すように第２金型１２は、第１金型１１と略対称に構成されている。すなわち、第２金型１２は、それぞれ円柱状をなす大径部１２ａと小径部１２ｂとからなり、小径部１２ｂにはキャビティ側面１２ｃ〜１２ｅが設けられている。キャビティ側面１２ｃは、小径部１２ｂの外周面の、大径部１２ａに近い側に設けられており、上記筒部２の第２の端部領域２ｃの内周面を形成するように構成されている。キャビティ側面１２ｄは、小径部１２ｂの外周面の、大径部１２ａから離れた側において、キャビティ側面１２ｃよりも一段低く彫り下げられたように設けられており、上記中間部領域２ａの内周面のその余の部分（中心軸Ｚの延伸方向中央部から図中右側の部分）を形成するように構成されている。また、キャビティ側面１２ｅは、キャビティ側面１２ｃとキャビティ側面１２ｄとの段差部に設けられており、上記第２のカム溝４の内側の側壁面４ｑ、および上記境界壁６の一側面（筒部２の内周面側に位置する側面）を形成するように構成されている。   As shown in FIG. 6, the second mold 12 is configured substantially symmetrically with the first mold 11. That is, the second mold 12 includes a large-diameter portion 12a and a small-diameter portion 12b each having a cylindrical shape, and the small-diameter portion 12b is provided with cavity side surfaces 12c to 12e. The cavity side surface 12c is provided on the side near the large diameter portion 12a of the outer peripheral surface of the small diameter portion 12b, and is configured to form the inner peripheral surface of the second end region 2c of the cylindrical portion 2. Yes. The cavity side surface 12d is provided so as to be carved one step lower than the cavity side surface 12c on the side away from the large diameter portion 12a of the outer peripheral surface of the small diameter portion 12b, and the inner peripheral surface of the intermediate region 2a. The other portion of the center portion (the portion on the right side in the drawing from the central portion in the extending direction of the central axis Z) is formed. Moreover, the cavity side surface 12e is provided in the level | step-difference part of the cavity side surface 12c and the cavity side surface 12d, the side wall surface 4q inside the said 2nd cam groove 4, and one side surface (cylinder part 2) of the said boundary wall 6 The side surface located on the inner peripheral surface side) is formed.

このように構成された第１金型および第２金型は、図７に示す型締めの際には、それぞれの先端部を互いに突き合わせるように、また図６に示す型開きの際には、中心軸Ｚの延伸方向に互いに離間するように、相対的に移動可能とされている。   The first mold and the second mold configured as described above are arranged so that the respective leading ends thereof are brought into contact with each other when the mold is clamped as shown in FIG. 7, and when the mold is opened as shown in FIG. , And relatively movable so as to be separated from each other in the extending direction of the central axis Z.

第３金型１３は、図９に示すように型開きの際に、互いに分離して上記筒部２の径方向外向きに移動可能な３個の分離金型１３ａ〜１３ｃからなる（図６，図７では分離金型１３ａが図示されておらず、図８では分離金型１３ｂが図示されていない）。なお、以下の説明において、３個の分離金型１３ａ〜１３ｃを互いに区別する必要がない場合は、分離金型１３ａ〜１３ｃ個々を第３金型１３と称する。   As shown in FIG. 9, the third mold 13 includes three separation molds 13 a to 13 c that are separated from each other and movable outward in the radial direction of the cylindrical portion 2 when the mold is opened (FIG. 6). , FIG. 7 does not show the separation mold 13a, and FIG. 8 does not show the separation mold 13b). In the following description, when it is not necessary to distinguish the three separation molds 13 a to 13 c from each other, each of the separation molds 13 a to 13 c is referred to as a third mold 13.

図６に示すように第３金型１３は、型締めの際に略円筒状をなすように構成されており、その内周面にキャビティ側面１３ｄ〜１３ｈが設けられている。キャビティ側面１３ｄは、第３金型１３の内周面の、中心軸Ｚの延伸方向中間部に設けられており、上記中間部領域２ａの外周面を形成するように構成されている。キャビティ側面１３ｅおよび１３ｆは、キャビティ側面１３ｄの図中左右両側にそれぞれ設けられており、上記第１の端部領域２ｂの外周面および上記第２の端部領域２ｃの外周面をそれぞれ形成するように構成されている。また、キャビティ側面１３ｇは、キャビティ側面１３ｄとキャビティ側面１３ｅとの段差部に設けられており、上記第１のカム溝３の外側の側壁面３ｐ、および上記境界壁５の一側面（筒部２の外周面側に位置する側面）を形成するように構成されている。同様にキャビティ側面１３ｈは、キャビティ側面１３ｄとキャビティ側面１３ｆとの段差部に設けられており、上記第２のカム溝４の外側の側壁面４ｐ、および上記境界壁６の一側面（筒部２の外周面側に位置する側面）を形成するように構成されている。   As shown in FIG. 6, the 3rd metal mold | die 13 is comprised so that the substantially cylindrical shape may be made in the case of mold clamping, and the cavity side surfaces 13d-13h are provided in the internal peripheral surface. The cavity side surface 13d is provided at an intermediate portion of the inner peripheral surface of the third mold 13 in the extending direction of the central axis Z, and is configured to form the outer peripheral surface of the intermediate region 2a. The cavity side surfaces 13e and 13f are respectively provided on the left and right sides of the cavity side surface 13d in the figure, and form the outer peripheral surface of the first end region 2b and the outer peripheral surface of the second end region 2c, respectively. It is configured. The cavity side surface 13g is provided at a step portion between the cavity side surface 13d and the cavity side surface 13e, and the side wall surface 3p outside the first cam groove 3 and one side surface of the boundary wall 5 (tubular portion 2). Of the outer peripheral surface side). Similarly, the cavity side surface 13h is provided at a step portion between the cavity side surface 13d and the cavity side surface 13f, and the side wall surface 4p on the outer side of the second cam groove 4 and one side surface of the boundary wall 6 (tubular portion 2). Of the outer peripheral surface side).

このように構成された第１金型１１、第２金型１２、および第３金型１３は、図７〜図９に示すように型締めされ、これにより図７に示すように各金型１１〜１３の間に、上記第１のカム筒１を成形するためのキャビティが形成される。なお、形成されたキャビティに溶融樹脂を充填するためのゲート、ランナ、スプルーは図示されていないが、これらは、例えば第１金型１１または第２金型１２に設けられる。   The first mold 11, the second mold 12, and the third mold 13 configured in this way are clamped as shown in FIGS. 7 to 9, thereby each mold as shown in FIG. 7. Between 11-11, the cavity for shape | molding the said 1st cam cylinder 1 is formed. Although the gate, runner, and sprue for filling the formed cavity with molten resin are not shown, these are provided in the first mold 11 or the second mold 12, for example.

溶融樹脂の充填後、所定の冷却期間を経て型開きがなされる。型開きの際には、第１金型１１と第２金型１２とが、中心軸Ｚの延伸方向に互いに離間するように相対的に移動するとともに、第３金型１３を構成する３個の分離金型１３ａ〜１３ｃが、筒部２の径方向外向きに移動して互いに分離する。   After filling with the molten resin, the mold is opened after a predetermined cooling period. When the mold is opened, the first mold 11 and the second mold 12 move relative to each other in the extending direction of the central axis Z so as to be separated from each other, and the three molds constituting the third mold 13 The separation molds 13a to 13c move outward in the radial direction of the cylindrical portion 2 and are separated from each other.

なお、型開き時における３個の分離金型１３ａ〜１３ｃの移動方向は、第１および第２のカム溝３，４の各外側の側壁面３ｐ，４ｐがアンダカットとならない方向、例えば、図１に示す第１のカム溝３の中心線ｗ１の図中下端から中心軸Ｚに下ろした垂線の延伸方向とされる。 The moving direction of the three separation molds 13a to 13c when the mold is opened is a direction in which the outer side wall surfaces 3p and 4p of the first and second cam grooves 3 and 4 are not undercut, for example, FIG. 1 is a direction in which a perpendicular extending from the lower end of the center line w 1 of the first cam groove 3 shown in FIG.

このような第１の金型装置１０によれば、上記第１のカム筒１を高精度に射出成形することが可能である。   According to such a first mold apparatus 10, the first cam cylinder 1 can be injection-molded with high accuracy.

次に、本発明に係る樹脂性カム筒の他の実施形態について説明する。図１０は樹脂性カム筒の他の実施形態を示す斜視図である。なお、図１０に示す樹脂性カム筒（以下「第２のカム筒」と称す）１Ａにおいては、上述した第１のカム筒１と概念的に共通する各構成要素に対して、図１〜図５で用いた符号を転用して付している。   Next, another embodiment of the resin cam barrel according to the present invention will be described. FIG. 10 is a perspective view showing another embodiment of the resin cam cylinder. In addition, in the resin cam cylinder (hereinafter referred to as “second cam cylinder”) 1A shown in FIG. 10, for each component that is conceptually common to the first cam cylinder 1 described above, FIG. The reference numerals used in FIG.

図１０に示すように第２のカム筒１Ａは、第２のカム溝４が、第１のカム溝３と略点対称の形状をなすように形成されている点において、上記第１のカム筒１と異なっている。それ以外については第１のカム筒１と同様の構成とされているので、詳細な説明は省略する。この第２のカム筒１Ａにおいては、第１のカム溝３における外側の側壁面３ｐがアンダカットとならない方向と、第２のカム溝４における外側の側壁面４ｐがアンダカットとならない方向とが、互いに異なっている。このため、上述した第１の金型装置１０では成形することが困難となる。   As shown in FIG. 10, the second cam cylinder 1 </ b> A is configured so that the second cam groove 4 is formed so as to have a substantially point-symmetric shape with the first cam groove 3. It is different from the tube 1. The rest of the configuration is the same as that of the first cam cylinder 1, and a detailed description thereof will be omitted. In the second cam cylinder 1A, there are a direction in which the outer side wall surface 3p in the first cam groove 3 is not undercut and a direction in which the outer side wall surface 4p in the second cam groove 4 is not undercut. Are different from each other. For this reason, it becomes difficult to mold with the first mold apparatus 10 described above.

このような第２のカム筒１Ａを成形するのに適した射出成形用金型装置の実施形態について、以下に説明する。図１１〜図１４は、本発明に係る射出成形用金型装置の第２実施形態を示すものであり、図１１は型開き時の斜視図（実際の型開き時の状態とは異なる。下記参照）、図１２は型締め時の正面図、図１３は図１２におけるＸ−Ｘ線に沿った断面図（簡略化して示す）、図１４は図１２におけるＹ−Ｙ線に沿った断面図（簡略化して示す）である。なお、図１１〜図１４において、各部の大きさや配置バランス等は、適宜変更して示してある。また、上述した第１の金型装置１０と概念的に共通する各構成要素に対しては、図６〜図９で用いた符号を転用して付している。   An embodiment of an injection mold apparatus suitable for molding the second cam cylinder 1A will be described below. FIGS. 11 to 14 show a second embodiment of an injection mold apparatus according to the present invention, and FIG. 11 is a perspective view when the mold is opened (different from the actual state when the mold is opened). 12 is a front view at the time of clamping, FIG. 13 is a sectional view taken along line XX in FIG. 12 (simplified), and FIG. 14 is a sectional view taken along line YY in FIG. (Simplified). In addition, in FIGS. 11-14, the magnitude | size of each part, arrangement | positioning balance, etc. are changed suitably and shown. In addition, the components used in FIG. 6 to FIG. 9 are assigned to the components that are conceptually common to the first mold apparatus 10 described above.

図１１〜図１４に示す射出成形用金型装置（以下「第２の金型装置」と称す）１０Ａは、上述した第２のカム筒１Ａを射出成形するものであって、第３金型１３を構成する３個の分離金型１３ａ〜１３ｃ（図１１では分離金型１３ａが図示されておらず、図１２では分離金型１３ｂが図示されていない）が、それぞれ２個の分離金型１３Ｌ，１３Ｒからなる点が上記第１の金型装置１０と異なっている。それ以外については第１の金型装置１０と同様の構成とされているので、詳細な説明は省略する。   An injection mold apparatus (hereinafter referred to as “second mold apparatus”) 10 </ b> A shown in FIGS. 11 to 14 performs injection molding of the above-described second cam cylinder 1 </ b> A, and is a third mold. The three separation molds 13a to 13c (the separation mold 13a is not shown in FIG. 11 and the separation mold 13b is not shown in FIG. 12) constituting each of the two separation molds The point which consists of 13L and 13R differs from the said 1st metal mold | die apparatus 10. FIG. The rest of the configuration is the same as that of the first mold apparatus 10, and a detailed description thereof will be omitted.

２個の分離金型１３Ｌ，１３Ｒは、型開き時の移動方向が互いに異なるように構成されている。すなわち、上記第２のカム筒１Ａにおける第１のカム溝３の外側の側壁面３ｐを形成する分離金型１３Ｌは、この第１のカム溝３の外側の側壁面３ｐがアンダカットとならない方向、例えば、図１０に示す第１のカム溝３の中心線ｗ１の図中下端から中心軸Ｚに下ろした垂線の延伸方向に移動するように構成される。一方、上記第２のカム筒１Ａにおける第２のカム溝４の外側の側壁面４ｐを形成する分離金型１３Ｒは、この第２のカム溝４の外側の側壁面４ｐがアンダカットとならない方向、例えば、図１０に示す第２のカム溝４の中心線ｗ２の図中上端から中心軸Ｚに下ろした垂線の延伸方向に移動するように構成される（図１３、図１４参照）。 The two separation molds 13L and 13R are configured such that the moving directions when the molds are opened are different from each other. That is, in the separation mold 13L forming the outer side wall surface 3p of the first cam groove 3 in the second cam cylinder 1A, the outer side wall surface 3p of the first cam groove 3 is not undercut. For example, the first cam groove 3 shown in FIG. 10 is configured to move in the extending direction of a perpendicular line extending from the lower end of the center line w 1 of the first cam groove 3 to the central axis Z. On the other hand, in the separation mold 13R forming the outer side wall surface 4p of the second cam groove 4 in the second cam cylinder 1A, the outer side wall surface 4p of the second cam groove 4 is not undercut. For example, the second cam groove 4 shown in FIG. 10 is configured to move in the extending direction of a perpendicular line extending from the upper end of the center line w2 of the second cam groove 4 to the central axis Z (see FIGS. 13 and 14).

このような第２の金型装置１０Ａによれば、上記第２のカム筒１Ａを高精度に射出成形することが可能である。   According to such a second mold apparatus 10A, the second cam cylinder 1A can be injection-molded with high accuracy.

次に、射出成形用金型装置の他の実施形態について説明する。図１５、図１６は、本発明に係る射出成形用金型装置の第３実施形態を示すものであり、図１５は型開き時の斜視図（実際の型開き時の状態とは異なる。下記参照）、図１６は型締め時の正面図である。なお、図１５、図１６において、各部の大きさや配置バランス等は、適宜変更して示してある。また、上述した第１の金型装置１０と概念的に共通する各構成要素に対しては、図６〜図９で用いた符号を転用して付している。   Next, another embodiment of an injection mold apparatus will be described. FIGS. 15 and 16 show a third embodiment of an injection mold apparatus according to the present invention, and FIG. 15 is a perspective view when the mold is opened (different from the actual state when the mold is opened). FIG. 16 is a front view at the time of mold clamping. In FIGS. 15 and 16, the size of each part, the arrangement balance, and the like are appropriately changed. In addition, the components used in FIG. 6 to FIG. 9 are assigned to the components that are conceptually common to the first mold apparatus 10 described above.

図１５、図１６に示す射出成形用金型装置（以下「第３の金型装置」と称す）１０Ｂは、上述した第１のカム筒１を射出成形するものであって、第３金型１３を構成する３個の分離金型１３ａ〜１３ｃ（図１５では分離金型１３ａが図示されておらず、図１６では分離金型１３ｂが図示されていない）が、それぞれ第１分離金型１３１、第２分離金型１３２および第３分離金型１３３からなる点において、上記第１の金型装置１０と異なっている。それ以外については第１の金型装置１０と同様の構成とされているので、詳細な説明は省略する。   15 and FIG. 16 shows an injection mold apparatus (hereinafter referred to as “third mold apparatus”) 10B for injection-molding the first cam cylinder 1 described above. The three separation molds 13a to 13c (the separation mold 13a is not shown in FIG. 15 and the separation mold 13b is not shown in FIG. 16) are included in the first separation mold 131, respectively. The first mold apparatus 10 is different from the first mold apparatus 10 in that it includes a second separation mold 132 and a third separation mold 133. The rest of the configuration is the same as that of the first mold apparatus 10, and a detailed description thereof will be omitted.

第１分離金型１３１は、第３金型１３の中間部分（中心軸Ｚの延伸方向における中間部分）を構成し、第２および第３分離金型１３２，１３３は、第３金型１３の図中左右両側の部分をそれぞれ構成している。   The first separation mold 131 constitutes an intermediate portion of the third mold 13 (intermediate portion in the extending direction of the central axis Z), and the second and third separation molds 132 and 133 are of the third mold 13. The left and right side portions in the figure are respectively configured.

この第３の金型装置１０Ｂにおいては、型開きの際、第３金型１３が以下のように分離するように構成されている。すなわち、まず第１分離金型１３１が第１のカム筒１（図１参照）の径方向外向きに移動し、第２および第３分離金型１３２，１３３の間に接近可能なスペースを作る。次に、第２および第３分離金型１３２，１３３が、中心軸Ｚの延伸方向に互いに近づくように移動する。その後、第２および第３分離金型１３２，１３３が、第１のカム筒１の径方向外向きに移動する。   The third mold apparatus 10B is configured such that the third mold 13 is separated as follows when the mold is opened. That is, first, the first separation mold 131 moves radially outward of the first cam cylinder 1 (see FIG. 1) to make a space accessible between the second and third separation molds 132 and 133. . Next, the second and third separation molds 132 and 133 move so as to approach each other in the extending direction of the central axis Z. Thereafter, the second and third separation molds 132 and 133 move outward in the radial direction of the first cam cylinder 1.

このような第３の金型装置１０Ｂによれば、第１のカム筒１における第１のカム溝３の外側の側壁面３ｐを形成する第２分離金型１３２と、第２のカム溝４の外側の側壁面４ｐを形成する第３分離金型１３３とが、第１のカム筒１の径方向外向きに移動する前に、中心軸Ｚの延伸方向に互いに近づくように移動して、第１および第２のカム溝３，４から離型するように構成されているので、第１および第２のカム溝３，４にアンダカットとなる部分が存在しない。したがって、第１のカム筒１に限らず、種々の形状をなす第１および第２のカム溝を備えたカム筒についても、これを高精度に射出成形することが可能である。   According to such a third mold apparatus 10B, the second separation mold 132 that forms the outer side wall surface 3p of the first cam groove 3 in the first cam cylinder 1 and the second cam groove 4 are formed. Before the third separation mold 133 forming the outer side wall surface 4p of the first cam cylinder 1 moves outward in the radial direction of the first cam cylinder 1 so as to approach each other in the extending direction of the central axis Z, Since the first and second cam grooves 3 and 4 are configured to be released from the mold, the first and second cam grooves 3 and 4 have no undercut portions. Therefore, not only the first cam cylinder 1 but also the cam cylinder having the first and second cam grooves having various shapes can be injection-molded with high accuracy.

以上、本発明の実施形態について説明したが、本発明は上述した実施形態に限られず、種々に態様を変更することが可能である。   As mentioned above, although embodiment of this invention was described, this invention is not restricted to embodiment mentioned above, A various aspect can be changed.

例えば、本発明の樹脂性カム筒において、第１および第２のカム溝は種々の形状に設定することが可能である。   For example, in the resin cam barrel of the present invention, the first and second cam grooves can be set in various shapes.

また、上記実施形態では、カメラ用のカム筒を例にとって説明したが、本発明はカメラ用以外の種々のカム筒に対して適用することが可能である。   In the above embodiment, the camera cam cylinder has been described as an example. However, the present invention can be applied to various cam cylinders other than the camera.

また、本発明の射出成形用金型装置において、構成金型の個数やそれらの分離面（ＰＬ面）等については、上述した実施形態に限られるものではなく、適宜に設定することが可能である。   Further, in the injection mold apparatus of the present invention, the number of constituent molds and their separation surfaces (PL surfaces) are not limited to the above-described embodiment, and can be set as appropriate. is there.

第１の樹脂性カム筒の斜視図A perspective view of the first resin cam cylinder 第１の樹脂性カム筒の周方向への展開図Development view of the first resin cam cylinder in the circumferential direction 第１の樹脂性カム筒の中心軸に沿った断面図Sectional view along the central axis of the first resin cam cylinder 図２におけるＡ−Ａ線に沿った断面図Sectional drawing along the AA line in FIG. 図２におけるＢ−Ｂ線に沿った断面図Sectional drawing along the BB line in FIG. 第１の金型装置の型開き時の斜視図The perspective view at the time of mold opening of the 1st metallic mold device 第１の金型装置の型締め時の断面図Sectional view at the time of mold clamping of the first mold apparatus 第１の金型装置の型締め時の正面図Front view at the time of mold clamping of the first mold apparatus 第１の金型装置の型締め時の左側面図Left side view of the first mold apparatus when the mold is clamped 第２の樹脂性カム筒の斜視図Perspective view of second resin cam barrel 第２の金型装置の型開き時の斜視図The perspective view at the time of mold opening of the 2nd metallic mold device 第２の金型装置の型締め時の正面図Front view at the time of mold clamping of the second mold apparatus 図１２におけるＸ−Ｘ線に沿った断面図Sectional drawing along the XX line in FIG. 図１２におけるＹ−Ｙ線に沿った断面図Sectional drawing along the YY line in FIG. 第３の金型装置の型開き時の斜視図The perspective view at the time of mold opening of the 3rd metallic mold device 第３の金型装置の型締め時の正面図Front view at the time of mold clamping of the third mold apparatus

符号の説明Explanation of symbols

１ 樹脂性カム筒（第１のカム筒）
１Ａ 樹脂性カム筒（第２のカム筒）
２ 筒部
２ａ 中間部領域
２ｂ 第１の端部領域
２ｃ 第２の端部領域
３ 第１のカム溝
３ａ〜３ｃ 溝孔
３ｐ，４ｐ 外側の側壁面
３ｑ，４ｑ 内側の側壁面
４ 第２のカム溝
４ａ〜４ｃ 溝孔
５，６ 境界壁
１０ 射出成形用金型装置（第１の金型装置）
１０Ａ 射出成形用金型装置（第２の金型装置）
１０Ｂ 射出成形用金型装置（第３の金型装置）
１１ 第１金型
１１ａ 大径部
１１ｂ 小径部
１１ｃ〜１１ｅ キャビティ側面
１２ 第２金型
１２ａ 大径部
１２ｂ 小径部
１２ｃ〜１２ｅ キャビティ側面
１３ 第３金型
１３ａ〜１３ｃ、１３Ｌ，１３Ｒ 分離金型
１３ｄ〜１３ｈ キャビティ側面
１３１ 第１分離金型
１３２ 第２分離金型
１３３ 第３分離金型
Ｚ 中心軸
ｗ１，ｗ２ 中心線
1 Resin cam cylinder (first cam cylinder)
1A Resin cam cylinder (second cam cylinder)
2 cylindrical portion 2a intermediate region 2b first end region 2c second end region 3 first cam groove 3a to 3c groove hole 3p, 4p outer side wall surface 3q, 4q inner side wall surface 4 second Cam groove 4a-4c Groove hole 5, 6 Boundary wall 10 Mold apparatus for injection molding (first mold apparatus)
10A mold apparatus for injection molding (second mold apparatus)
10B Mold device for injection molding (third mold device)
11 1st metal mold | die 11a Large diameter part 11b Small diameter part 11c-11e Cavity side surface 12 2nd metal mold 12a Large diameter part 12b Small diameter part 12c-12e Cavity side surface 13 3rd metal mold 13a-13c, 13L, 13R Separation mold 13d ˜13h Cavity side surface 131 First separation mold 132 Second separation mold 133 Third separation mold Z Center axis w 1 , w 2 Center line

Claims (4)

円筒状の筒部に、該筒部の中心軸の延伸方向に互いに離間した第１および第２のカム溝が形成されてなる樹脂製のカム筒であって、
前記筒部において、前記延伸方向の中間部分に位置する中間部領域は、該中間部領域の前記延伸方向両側にそれぞれ位置する第１および第２の端部領域よりも、内径が小さく形成されており、
前記第１のカム溝は、前記中間部領域と前記第１の端部領域との境界に沿って配置され、該第１のカム溝の両側壁面のうち、前記延伸方向外側に位置する外側の側壁面は、前記第１の端部領域の縁に形成され、前記中心軸の延伸方向内側に位置する内側の側壁面は、前記中間部領域の縁に形成され、該第１のカム溝における前記外側および内側の側壁面は、該第１のカム溝の幅の中心線上の各点から前記中心軸に下ろした各垂線の集合からなる曲面とそれぞれ略平行となるように形成されており、
前記第２のカム溝は、前記中間部領域と前記第２の端部領域との境界に沿って配置され、該第２のカム溝の両側壁面のうち、前記延伸方向外側に位置する外側の側壁面は、前記第２の端部領域の縁に形成され、前記中心軸の延伸方向内側に位置する内側の側壁面は、前記中間部領域の縁に形成され、該第２のカム溝における前記外側および内側の側壁面は、該第２のカム溝の幅の中心線上の各点から前記中心軸に下ろした各垂線の集合からなる曲面とそれぞれ略平行となるように形成されている、
ことを特徴とする樹脂製カム筒。 A resin cam cylinder in which a cylindrical tube portion is formed with first and second cam grooves spaced apart from each other in the extending direction of the central axis of the tube portion,
In the cylindrical portion, the intermediate region located at the intermediate portion in the extending direction has a smaller inner diameter than the first and second end regions positioned on both sides of the intermediate region in the extending direction. And
The first cam groove is disposed along a boundary between the intermediate region and the first end region, and is located on an outer side located on the outer side in the extending direction among both side wall surfaces of the first cam groove. A side wall surface is formed at an edge of the first end region, and an inner side wall surface located on the inner side in the extending direction of the central axis is formed at an edge of the intermediate region, and in the first cam groove The outer and inner side wall surfaces are formed so as to be substantially parallel to a curved surface formed by a set of perpendiculars extending from the respective points on the central line of the width of the first cam groove to the central axis,
The second cam groove is disposed along a boundary between the intermediate region and the second end region, and is located on an outer side located on the outer side in the extending direction among both side wall surfaces of the second cam groove. A side wall surface is formed at an edge of the second end region, and an inner side wall surface located inside the extending direction of the central axis is formed at an edge of the intermediate region, and the second cam groove The outer and inner side wall surfaces are formed so as to be substantially parallel to a curved surface formed by a set of perpendiculars extending from the respective points on the central line of the width of the second cam groove to the central axis.
A resin cam cylinder characterized by that. 前記第１および第２のカム溝は、前記筒部の周方向に互いに離間して配置された複数の溝孔によりそれぞれ構成されている、ことを特徴とする請求項１記載の樹脂製カム筒。   2. The resin cam cylinder according to claim 1, wherein the first and second cam grooves are each configured by a plurality of groove holes that are spaced apart from each other in the circumferential direction of the cylinder portion. . 請求項１または２記載の樹脂製カム筒を製造するための射出成形用金型装置であって、
前記筒部の前記第１の端部領域の内周面と、前記第１のカム溝の前記内側の側壁面と、該中間部領域の内周面の一部を形成する第１金型と、
前記筒部の前記第２の端部領域の内周面と、前記第２のカム溝の前記内側の側壁面と、該中間部領域の内周面のその余の部分とを形成する第２金型と、
前記筒部の前記第１および第２の端部領域ならびに前記中間部領域の各外周面と、前記第１および第２のカム溝の各前記外側の側壁面とを形成する第３金型と、を備え、
前記第１金型および前記第２金型は、型開きの際に、前記延伸方向に互いに離間するように相対的に移動可能とされ、
前記第３金型は、前記型開きの際に、互いに分離して前記筒部の径方向外向きに移動可能な複数の分離金型からなる、
ことを特徴とする射出成形用金型装置。 An injection mold apparatus for producing the resin cam cylinder according to claim 1 or 2,
An inner peripheral surface of the first end region of the tubular portion, an inner side wall surface of the first cam groove, and a first mold forming a part of the inner peripheral surface of the intermediate region; ,
A second forming the inner peripheral surface of the second end region of the cylindrical portion, the inner side wall surface of the second cam groove, and the remaining portion of the inner peripheral surface of the intermediate region. Mold,
A third mold for forming the outer peripheral surfaces of the first and second end regions and the intermediate region of the cylindrical portion and the outer side wall surfaces of the first and second cam grooves; With
The first mold and the second mold are relatively movable so as to be separated from each other in the extending direction when the mold is opened.
The third mold is composed of a plurality of separation molds that can be separated from each other and moved radially outward of the cylindrical portion when the mold is opened.
An injection mold apparatus characterized by the above. 前記分離金型は、前記第３金型における前記延伸方向の中間部分を構成する第１分離金型と、該中間部分の前記延伸方向両側の部分をそれぞれ構成する第２および第３分離金型とからなり、
前記型開きの際には、まず前記第１分離金型が前記筒部の径方向外向きに移動し、次に前記第２および第３分離金型が前記延伸方向に互いに近づくように移動し、その後該第２および第３分離金型が前記筒部の径方向外向きに移動するように構成されている、
ことを特徴とする請求項３記載の射出成形用金型装置。
The separation mold includes a first separation mold that constitutes an intermediate portion in the extending direction of the third mold, and second and third separation molds that respectively constitute portions on both sides of the intermediate portion in the extending direction. And consist of
When the mold is opened, the first separation mold first moves radially outward of the cylindrical portion, and then the second and third separation molds move so as to approach each other in the extending direction. Then, the second and third separation molds are configured to move outward in the radial direction of the cylindrical portion.
4. The mold apparatus for injection molding according to claim 3.
JP2005316852A 2005-10-31 2005-10-31 Resin cam barrel and mold device for injection molding for manufacturing the same Abandoned JP2007121891A (en)

Priority Applications (1)

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JP2005316852A JP2007121891A (en) 2005-10-31 2005-10-31 Resin cam barrel and mold device for injection molding for manufacturing the same

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JP2005316852A JP2007121891A (en) 2005-10-31 2005-10-31 Resin cam barrel and mold device for injection molding for manufacturing the same

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011158517A1 (en) * 2010-06-18 2011-12-22 日東電工株式会社 Method for producing perforated hollow tube and mold form for producing perforated hollow tube

Citations (5)

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Publication number Priority date Publication date Assignee Title
JPS5979315U (en) * 1982-11-19 1984-05-29 富士通株式会社 Mold equipment
JPS6042722A (en) * 1983-08-18 1985-03-07 Matsushita Electric Ind Co Ltd Zoom lens device
JPS6368617U (en) * 1986-10-24 1988-05-09
JPH03130708A (en) * 1989-10-17 1991-06-04 Fuji Photo Optical Co Ltd Zoon lens moving mechanism
JP2001116975A (en) * 1999-10-22 2001-04-27 Canon Inc Lens driving device, finder device, camera, and optical equipment

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5979315U (en) * 1982-11-19 1984-05-29 富士通株式会社 Mold equipment
JPS6042722A (en) * 1983-08-18 1985-03-07 Matsushita Electric Ind Co Ltd Zoom lens device
JPS6368617U (en) * 1986-10-24 1988-05-09
JPH03130708A (en) * 1989-10-17 1991-06-04 Fuji Photo Optical Co Ltd Zoon lens moving mechanism
JP2001116975A (en) * 1999-10-22 2001-04-27 Canon Inc Lens driving device, finder device, camera, and optical equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011158517A1 (en) * 2010-06-18 2011-12-22 日東電工株式会社 Method for producing perforated hollow tube and mold form for producing perforated hollow tube

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