JPH0414429Y2 - - Google Patents
Info
- Publication number
- JPH0414429Y2 JPH0414429Y2 JP9103286U JP9103286U JPH0414429Y2 JP H0414429 Y2 JPH0414429 Y2 JP H0414429Y2 JP 9103286 U JP9103286 U JP 9103286U JP 9103286 U JP9103286 U JP 9103286U JP H0414429 Y2 JPH0414429 Y2 JP H0414429Y2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- molds
- lens
- body mold
- diameter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000011521 glass Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 7
- 238000005498 polishing Methods 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Description
【考案の詳細な説明】
産業上の利用分野
本考案は研磨によらず、成形によりレンズを製
造するためのレンズ用金型に関するものである。[Detailed Description of the Invention] Industrial Application Field The present invention relates to a lens mold for manufacturing lenses by molding rather than polishing.
従来の技術
レンズは主にガラス素材を研磨して形状を仕上
げ、製造されている。しかし、研磨では球面レン
ズは満足のできるものができるが、最近、特に、
高性能化、レンズ枚数の削減、コンパクト化の要
求に応えるため、導入の必要性を叫ばれている非
球面レンズにおいては、研磨の技術では、採算の
合うものを製造することは難しい。Conventional Technology Lenses are mainly manufactured by polishing glass materials to give them a final shape. However, although spherical lenses can be made satisfactorily by polishing, recently, especially,
In order to meet the demands for higher performance, reduction in the number of lenses, and compactness, it is difficult to manufacture aspherical lenses profitably using polishing technology, which is becoming increasingly important.
これに対し、プラスチツク材料を使い、射出成
形等により、球面、非球面のレンズを制する方法
も盛んとなつてきている。しかし、プラスチツク
材料の屈折率と分散の範囲が、ガラスに比べると
狭いこと、耐熱、耐湿性において、ガラスに劣る
こと、などの理由により使える範囲も限定されて
いる。これらのことから、ガラスを研磨でなく成
形によつて形状を仕上げてレンズとする技術が重
要な地位を占めていることがわかる。このような
技術としては、たとえば特開昭58−84134号公報
のように所望の最終製品の形状に近似する形状を
有するガラスを加熱してレンズ形状、および面粗
度を得る方法がある。この方法であれば、レンズ
性能的には金型の精度が十分であれば、十分に満
足のできるものが得られる。 On the other hand, methods of manufacturing spherical and aspherical lenses using plastic materials, such as injection molding, are becoming popular. However, the range of plastic materials that can be used is limited because the range of refractive index and dispersion of plastic materials is narrower than that of glass, and that plastic materials are inferior to glass in terms of heat resistance and moisture resistance. From these facts, it can be seen that the technology of forming lenses by shaping glass rather than polishing it has an important position. As such a technique, for example, there is a method as disclosed in Japanese Patent Application Laid-Open No. 58-84134, in which a lens shape and surface roughness are obtained by heating glass having a shape that approximates the shape of a desired final product. With this method, as long as the precision of the mold is sufficient, it is possible to obtain a lens that is completely satisfactory in terms of lens performance.
しかし、成形によつて、光学的性能を満足する
レンズを得るためには、第４図に示したように、
一対の金型１，２の中心軸を一致させることが重
要である。そのために３のリング状の胴型と、一
対の金型１，２とのクリアランスを小さくする必
要がある。しかし、前記クリアランスを小さくす
ると、リング状の胴型３と、金型１，２のはめあ
いが難しくなり、生産上、自動化装置導入上の問
題点となつていた。 However, in order to obtain a lens that satisfies optical performance through molding, as shown in Figure 4,
It is important that the central axes of the pair of molds 1 and 2 coincide. For this purpose, it is necessary to reduce the clearance between the ring-shaped body mold 3 and the pair of molds 1 and 2. However, when the clearance is made smaller, it becomes difficult to fit the ring-shaped body mold 3 with the molds 1 and 2, which poses a problem in terms of production and introduction of automation equipment.
また、金型１，２のエツジ部は、前記クリアラ
ンスが小さいと、集中応力がかかりやすくなり、
その結果としてカケを生じ、金型寿命を短くして
いる。 Furthermore, if the clearance is small, concentrated stress is likely to be applied to the edge portions of the molds 1 and 2.
As a result, chips occur, shortening the life of the mold.
考案が解決しようとする問題点
従来のレンズ用金型では、光学的性能に影響す
る金型１，２の中心軸ずれの少ないレンズを成形
するため、金型１，２と、それを案内するリング
状の胴型３のクリアランスを機械加工精度を向上
させ、できる限り小さくして対応していた。しか
し、この方法では、金型１，２とリング状の胴型
３のはめあう部分の加工精度を向上させる必要も
あるし、折角作つた金型も、何回か使用するうち
に、クリアランスが小さいため、金型エツジ部が
カケるといつたことがおきやすく、金型寿命の点
でも問題であつた。本考案は上記の問題点を解決
するもので、長期にわたり、光学性能上、優れた
レンズを、容易に自動化を進めて、生産できるレ
ンズ用金型を提供しようとするものである。Problems that the invention aims to solve In conventional lens molds, in order to mold lenses with less center axis deviation between the molds 1 and 2, which affects optical performance, the molds 1 and 2 and the molds that guide them are used. The clearance of the ring-shaped body mold 3 was made as small as possible by improving machining accuracy. However, with this method, it is necessary to improve the machining accuracy of the fitting part between the molds 1 and 2 and the ring-shaped body mold 3, and the molds that have been made with great effort may have some clearance after being used several times. Because of its small size, the edges of the mold tend to break, which is a problem in terms of mold life. The present invention solves the above-mentioned problems and aims to provide a mold for lenses that can be easily automated to produce lenses with excellent optical performance over a long period of time.
問題点を解決するための手段
上記の問題点を解決するため、本考案は、ガラ
スを研磨でなく成形によつて形状を仕上げてレン
ズとする時に使用するレンズ用金型を、一対の金
型とレンズ側面を形成する胴型により形成し、胴
型、内径と一対の金型の外径の案内部を二段に
し、且つ各段の長さ関係を規定して構成すること
により、前記の目的を達成しようとするものであ
る。Means for Solving the Problems In order to solve the above problems, the present invention has developed a lens mold that is used when shaping glass into a lens by molding rather than polishing. The lens is formed by a barrel mold that forms the lens side surface, and the guide portions for the barrel mold, the inner diameter, and the outer diameter of the pair of molds are made into two stages, and the length relationship of each stage is defined. It is an attempt to achieve a goal.
作 用
本考案のレンズ用金型では、キヤビテイに近い
部分の金型の外径を、他の部分より小さくして二
段にし、金型と胴型とのはめあいの案内を、クリ
アランスを適切に設定することにより、キヤビテ
イから遠い外径の大きな部分で、できるように構
成し、一対の金型の中心軸の一致の精度を上げた
状態のままで、スムーズに金型を胴型に組みこむ
ことができるように改善するものである。Function In the lens mold of the present invention, the outside diameter of the part of the mold near the cavity is made smaller than the other parts, and the mold is made into two stages to guide the fit between the mold and the body mold, and to maintain appropriate clearance. By setting this, the mold can be assembled into the body mold smoothly while maintaining the precision of the alignment of the center axes of the pair of molds. The goal is to improve as much as possible.
実施例
以下、本考案のレンズ用金型の一実施例を図面
を参照しながら説明する。Embodiment Hereinafter, an embodiment of the lens mold of the present invention will be described with reference to the drawings.
第１図は、本考案に係るレンズ用金型の断面図
を示すものである。従来例を示した第４図に対応
している。 FIG. 1 shows a sectional view of a lens mold according to the present invention. This corresponds to FIG. 4 showing a conventional example.
金型１，２は、レンズ側面を形成する胴型３
の、内径の大きな第一の部分６で案内されてい
る。つまり、胴型３の内径の大きな第一の部分６
と、キヤビテイ５を形成する内径の小さな第二の
部分７のクリアランスd2，d1においてd1＞d2の関
係にしてある。具体的には、d2は成形するレンズ
の使用目的により値が異なるが、5μm以下にする
ことが望ましい。特に非球面を含んだレンズの場
合、球面レンズの時のように芯とり作業で簡単
に、光軸をあわせることも不可能になるため、d2
は小さい程望ましい。d1はキヤビテイ内のガラス
が、加熱加圧された時に、d1のすき間から流れ出
し、バリとならない程度であればよく、ガラスの
種類、加熱温度、加圧力等の成形条件にもよるが
10〜15μm以内であれば良い。 The molds 1 and 2 are a body mold 3 that forms the side surface of the lens.
It is guided by a first portion 6 having a large inner diameter. In other words, the first portion 6 of the body mold 3 having a large inner diameter
The relationship between the clearances d 2 and d 1 of the second portion 7 having a small inner diameter forming the cavity 5 is such that d 1 >d 2 . Specifically, the value of d 2 varies depending on the purpose of use of the lens to be molded, but it is desirable to set it to 5 μm or less. In particular, in the case of lenses containing aspherical surfaces, it is impossible to align the optical axes as easily as with spherical lenses, so d 2
The smaller the value, the better. d 1 is sufficient as long as the glass in the cavity does not flow out of the gap d 1 and form burrs when heated and pressurized, although it depends on the molding conditions such as the type of glass, heating temperature, and pressure.
It is sufficient if it is within 10 to 15 μm.
また、金型、胴型の各々の径の部分の長さを、
第１図に示したように、l1＞l2，l3＞l1の関係を満
すように構成している。つまり、第２図は、一対
の金型１，２あ胴型３に、はめこまれ、さらに、
加熱、加圧される様子をしめした図であり、この
図を使い以下説明をつづける。先ず(a)のようなガ
ラス４が胴型３に入れられた状態から、胴型３に
対して、金型１，２が、図示の矢印の方向に進ん
でいく。（金型１，２の駆動手段加熱装置につい
ては、省略してある。図では金型１，２が共に矢
印の方向に進む実施例であるが、１まはたは２の
いずれかが固定で、ある場合ももちろん含まれ
る。）そして(b)のように、胴型３の端部に近い、
径の大きな第一の部分６で、まず金型１，２の径
の大きな部分が案内される。これは、l1＞l2，l3
＞l1の関係を満しているからである。したがつ
て、金型１，２のキヤビテイに近いエツジ部は径
が小さいので、胴型３の端部で、胴型３と接触す
る恐れがない。さらに金型１，２が矢印の方向に
進み、加熱加圧にいたるが、その様子を図示した
のが(c)である。d1＞d2，l1＞l2，l3＞l1の関係があ
るので、胴型３の径の小さな第二の部分７では、
胴型１，２のと接触することはまつたくない。本
考案を実施するにあたつて、金型１，２および胴
型３の案内部を二段に同芯性をもたせて加工する
ことが必要であるが、その加工は、困難なことで
はない。 Also, the length of each diameter part of the mold and body mold,
As shown in FIG. 1, the structure is such that l 1 >l 2 and l 3 >l 1 are satisfied. In other words, in FIG. 2, a pair of molds 1 and 2 are fitted into a body mold 3, and
This is a diagram showing the state of heating and pressurization, and the explanation will be continued below using this diagram. First, from a state where the glass 4 as shown in (a) is placed in the body mold 3, the molds 1 and 2 advance relative to the body mold 3 in the direction of the illustrated arrow. (The drive means and heating device for molds 1 and 2 are omitted. The figure shows an example in which both molds 1 and 2 move in the direction of the arrow, but either 1 or 2 is fixed. (Of course, it is included in some cases.) And as in (b), near the end of the body type 3,
First, the large diameter portions of the molds 1 and 2 are guided by the first large diameter portion 6. This means that l 1 > l 2 , l 3
This is because the relationship >l 1 is satisfied. Therefore, since the edge portions of the molds 1 and 2 near the cavities have a small diameter, there is no risk of contact with the body mold 3 at the end of the body mold 3. The molds 1 and 2 further advance in the direction of the arrows and are heated and pressurized, which is illustrated in (c). Since there is a relationship of d 1 > d 2 , l 1 > l 2 , l 3 > l 1 , in the second portion 7 of the body mold 3 having a small diameter,
I don't want it to come into contact with bodies 1 and 2. In implementing the present invention, it is necessary to process the guide parts of the molds 1 and 2 and the body mold 3 so that they are concentric in two stages, but this process is not difficult. .
さらに、第３図の実施例のようにａ，ｂ，ｃ部
の面取り、またはＲ加工を施こすことにより、操
作性は向上する。 Furthermore, by chamfering or rounding portions a, b, and c as in the embodiment shown in FIG. 3, operability is improved.
考案の効果
以上説明した通り、本考案に斯かるレンズ用金
型は、胴型の内径と一対の金型の案内部を二段に
し、胴型と端部に近い、径の大きな第一の部分
の、金型とのクリアランスを、キヤビテイに近
い、径の小さな第二の部分の金型とのクリアラン
スに比べて小さくし、さらに胴型の径の大きな第
一の部分の長さに比べて、胴型の第一の部分とは
めあう金型の長さを短かくし、かつ、胴型の径の
大きな第一の部分にはめあう金型の長さに比べ
て、胴型の径の小さな第二の部分に、はめあう金
型の長さを短かくした構成であるので、胴型と金
型の案内部のカジリ現象をおこすことなく、レン
ズの両面の光軸の一致を高精度で実現することが
できる効果がある。これは、加工後の芯とり作業
が簡単にできない、非球面レンズの時は、特に効
果がある。さらに、金型のエツジ部は、カケるこ
とがなくなり、金型の寿命が延びる効果もある。
また、クリアランスを必要以上に厳しくする必要
がなくなり、自動化が容易となる効果もある。Effects of the Invention As explained above, the lens mold according to the present invention has the inner diameter of the body mold and the guide parts of the pair of molds in two stages, and the inner diameter of the body mold and the first part with the larger diameter near the end. The clearance between the part and the mold is made smaller than the clearance with the mold of the second part with the smaller diameter, which is closer to the cavity, and further compared to the length of the first part with the larger diameter of the body mold. , the length of the mold that fits into the first part of the body mold is shortened, and the diameter of the body mold is small compared to the length of the mold that fits into the first part of the body mold with a large diameter. The second part has a shortened length of the fitting mold, so the optical axes of both sides of the lens can be aligned with high precision without causing galling between the body mold and the guide part of the mold. There are effects that can be achieved. This is particularly effective for aspheric lenses, which cannot be easily centered after processing. Furthermore, the edges of the mold are prevented from chipping, which has the effect of extending the life of the mold.
Further, there is no need to make the clearance more strict than necessary, and there is also the effect that automation becomes easier.
第１図は本考案の一実施例を示す断面図、第２
図は、本考案の金型をつかつた成形の実施例を示
す断面図、第３図は本考案の他の一実施例を示す
断面図、第４図は従来の実施例を示す図である。
１，２……一対の金型、３……胴型、４……ガ
ラス材料、５……キヤビテイ、６……胴型の第一
の部分、７……胴型の第二の部分。
Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a sectional view showing an embodiment of molding using the mold of the present invention, Figure 3 is a sectional view showing another embodiment of the invention, and Figure 4 is a diagram showing a conventional embodiment. be. DESCRIPTION OF SYMBOLS 1, 2...Pair of metal molds, 3...Body mold, 4...Glass material, 5...Cavity, 6...First part of barrel mold, 7...Second part of barrel mold.
Claims (1)
型とレンズ側面を形成する胴型により形成し、前
記胴型内径と一対の金型の外径の案内部を二段に
し、前記胴型の端部に近い、径の大きな第一の部
分の前記金型とのクリアランスを、前記キヤビテ
イに近い、径の小さな第二の部分の前記金型との
クリアランスに比べて小さくし、さらに、前記胴
型の径の大きな第一の部分の長さに比べて、前記
胴型の第一の部分とはめあう前記金型の長さを短
かくしかつ、前記胴型の径の大きな第一の部分に
はめあう前記金型の長さに比べて、前記胴型の径
の小さな第二の部分にはめあう前記金型の長さを
短かくしたことを特徴とするレンズ用金型。 A cavity for molding the glass material is formed by a pair of metal molds and a body mold that forms the side surface of the lens, and the inner diameter of the body mold and the guide part of the outer diameter of the pair of molds are made into two stages, and the end of the body mold The clearance between the first part, which has a large diameter and is close to the cavity, with the mold is made smaller than the clearance between the second part, which has a small diameter and which is close to the cavity, and the mold. The length of the mold that fits into the first part of the body mold is made shorter than the length of the first part that has a large diameter, and the mold fits into the first part of the body mold that has a large diameter. A mold for a lens, characterized in that the length of the mold that fits into a second portion of the body mold having a smaller diameter is shorter than the length of the mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9103286U JPH0414429Y2 (en) | 1986-06-13 | 1986-06-13 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9103286U JPH0414429Y2 (en) | 1986-06-13 | 1986-06-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62203235U JPS62203235U (en) | 1987-12-25 |
| JPH0414429Y2 true JPH0414429Y2 (en) | 1992-03-31 |
Family
ID=30951441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9103286U Expired JPH0414429Y2 (en) | 1986-06-13 | 1986-06-13 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0414429Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006176393A (en) * | 2004-11-25 | 2006-07-06 | Hoya Corp | Molding die for molding press and method for manufacturing optical element |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5867260B2 (en) * | 2012-04-19 | 2016-02-24 | 旭硝子株式会社 | Optical element molding die and optical element molding method |
-
1986
- 1986-06-13 JP JP9103286U patent/JPH0414429Y2/ja not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006176393A (en) * | 2004-11-25 | 2006-07-06 | Hoya Corp | Molding die for molding press and method for manufacturing optical element |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62203235U (en) | 1987-12-25 |
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