JPS60129221A - Molding method of lens - Google Patents

Abstract

PURPOSE:To obtain a high-precision and inexpensive molded lens where the lens is incorporated with a lens barrel mating their central axes with each other by heating resin material arranged in the perforation of the lens barrel, then, molding the material into a lens shape with the punches provided in said perforation. CONSTITUTION:First, lens resin material (hereinafter, material) is arranged in the perforation of the lens barrel 16 made of aluminium, etc. As the material 15 is heated at the moldable temperature, pressure P is given through the mold surfaces 13, 14 of the upper and the lower punch 11, 12 prearranged in the perforation to mold the material 15 into the lens shap. Usually, this lens is cooled then, the upper and the lower punch 11, 12 are removed to obtain a molded lens where the lens 17 and the lens barrel 16 are incorporated into one piece. Further, the outer diameter of the punches 11, 12 and the inner diameter of the lens barrel 16 are preferably manufactured to such accuracy that they are fitted slidably. EFFECT:Assembling unnecessary. Lens completely free from flaws.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は光学機器に使用される、例えばレーザー集光レ
ンズ、カメラレンズ、拡大鏡といった種々のレンズと該
レンズを保持するための鏡胴とを一体化した成形レンズ
に関するもので、高精度のレンズ形状でかつレンズと鏡
胴の組立を不要にしたレンズ成形方法を提供するもので
ある。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a method for integrating various lenses used in optical equipment, such as laser condensing lenses, camera lenses, and magnifying glasses, with a lens barrel for holding the lenses. The present invention relates to a molded lens that has a highly accurate lens shape and provides a lens molding method that eliminates the need for assembling the lens and lens barrel.

従来例の構成とその問題点 従来、レンズと鏡胴は個別の部品として製作されて後、
レンズ本来の性能をそこなうことなく、鏡胴内部にビス
止め、接着といった方法でレンズを固定する作業がなさ
れていた。Conventional configuration and its problems Traditionally, lenses and barrels were manufactured as separate parts, and then
The lens was fixed inside the lens barrel using screws or adhesives without sacrificing the original performance of the lens.

例えば樹脂制料を用いた射出成形レンズでは、レンズ成
形後金型内より取シ出し、成形ゲートの切断、レンズ面
に反射防止膜のコーティング、ハードコーティング、さ
らに鏡胴内への組み込み固定といつた工程を経て初めて
レンズと鏡ｌ同とが一体化される。一般的な樹脂材料を
用いたレンズの欠点は、その材料が持つ硬度が軟かいた
め、レンズ成形以後、鏡胴への組み込み過程において、
レンズ面にキズをつけ易く、成形されたレンズ本来の性
能を劣化させるだけでなく、製品としての価値をも低下
させる。For example, in an injection molded lens using a resin material, after the lens is molded, the lens is removed from the mold, the molding gate is cut, the lens surface is coated with an anti-reflection film, hard coated, and then the lens is assembled and fixed into the lens barrel. The lens and mirror are integrated only after the process has been completed. The disadvantage of lenses using general resin materials is that the material has a soft hardness, so after the lens is molded, during the process of assembling it into the lens barrel,
The lens surface is easily scratched, which not only deteriorates the inherent performance of the molded lens but also reduces its value as a product.

さらに鏡胴への組み込み時の問題として基本的にレンズ
光軸と鏡胴の中心軸をいかに合致させ、位置決め精度よ
く固定するかである。これは、レンズを使用する機器へ
の取付精度とも関係がありどちらか一方の精度夙悪いと
、機器とレンズ間で光軸の調整をするだめのアジャスト
機構が必要とな、る。Furthermore, when assembling the lens into the lens barrel, the basic problem is how to align the optical axis of the lens with the central axis of the lens barrel, and how to fix the lens with high positioning accuracy. This is also related to the precision with which the lens is attached to the equipment that uses it, and if either of them is not as accurate, an adjustment mechanism will be required to adjust the optical axis between the equipment and the lens.

特に２枚以上の組合せレンズの場合には、さらに難しく
レンズ間の光軸も精度よく同軸上に合致させなくてはな
ら々い。Particularly in the case of a combination of two or more lenses, it is even more difficult to make the optical axes of the lenses coaxially coincide with each other with high precision.

以下従来の欠点を図面とともに説明する。第１図〜第３
図は従来のレンズと鏡胴との関係を示す要部断面図であ
シ、第１図に示すような円筒状からなる鏡胴１の内面５
にレンズ位置決め用凸部２を設け、レンズ３は前記凸部
２と内面６で接着あるいは軽圧入、ネジ締結（図示せず
）等の手段で支持され、固定される。この場合レンズ光
軸６と鏡胴１の中心軸７はｔｌぼ一致している。しかし
ながらレンズ３の外径寸法バラツキや、鏡胴１の特に内
面５０寸法バラツキ、さらに凸部２の中心軸７に対する
直交性が悪いと、レンズ光軸６と中心軸７の関係は第２
図のように一致しない。The drawbacks of the conventional technology will be explained below with reference to the drawings. Figures 1 to 3
The figure is a sectional view of a main part showing the relationship between a conventional lens and a lens barrel.
A lens positioning convex portion 2 is provided on the lens 3, and the lens 3 is supported and fixed between the convex portion 2 and the inner surface 6 by means of adhesive, light press-fitting, screw fastening (not shown), or the like. In this case, the lens optical axis 6 and the central axis 7 of the lens barrel 1 coincide with each other by about tl. However, if there are variations in the outer diameter of the lens 3, variations in the dimensions of the lens barrel 1, especially the inner surface 50, and if the orthogonality of the convex portion 2 to the central axis 7 is poor, the relationship between the lens optical axis 6 and the central axis 7 will be
It doesn't match as shown.

又上述したようにレンズ３および鏡胴１の形状精度が悪
いと第３図のごとくレンズ３および３′間のレンズ光軸
６．６′の関係はさらにばらつくことに々りこのような
場合組合せレンズとしての機能を有さないものと彦る。Furthermore, as mentioned above, if the shape precision of the lens 3 and the lens barrel 1 is poor, the relationship between the lens optical axes 6 and 6' between the lenses 3 and 3' will often vary even further, as shown in Figure 3. I don't think it has any function as a lens.

第２図は前述したように、機器側に設けられたアジャス
ト機構により、機器とレンズ光゛軸６との調整は可能で
あるが、第３図の様に組合せレンズにおいては、レンズ
３およびレンズ３′、さらに鏡胴１の３つの部品精度と
組立精度とを向上させる以外に満足な性能のレンズシス
テムを得ることは出来ない。As mentioned above, in FIG. 2, it is possible to adjust the device and the lens optical axis 6 using the adjustment mechanism provided on the device side, but in the case of a combination lens as shown in FIG. 3', and it is not possible to obtain a lens system with satisfactory performance except by improving the accuracy of the three parts of the lens barrel 1 and the assembly accuracy.

上述した種々の欠点を有することは１１例えばレーザー
集光用レンズ等では性能上からもレーザー光が所定の寸
法範囲に集光しないといった致命的なものもある。又レ
ンズ３の外径が小型化されるにつれて組立ておよび固定
する作業も難しく、性能。The various drawbacks mentioned above are 11. For example, there are some fatal problems such as laser light focusing lenses that do not focus the laser light within a predetermined size range from a performance point of view. Furthermore, as the outer diameter of the lens 3 becomes smaller, assembly and fixing work become more difficult, and performance becomes more difficult.

生産面の両面から改善が望まれていた。Improvements were desired from both aspects of production.

発明の目的 本発明は上述した種々の問題を解決するため、レンズと
該レンズを保持する鏡胴との関係において、前記鏡胴内
部において、レンズ成形を行なうことにより、前記レン
ズと前記鏡胴との中心軸が一致した状態で一体化せしめ
ることで、高精度で安価な成形レンズを提供することを
目的とする。Purpose of the Invention In order to solve the above-mentioned various problems, the present invention aims to improve the relationship between a lens and a lens barrel that holds the lens by molding the lens inside the lens barrel. The objective is to provide a highly accurate and inexpensive molded lens by integrating the lenses with their central axes aligned.

発明の構成 本発明は貫通穴を有してなるレンズ鏡胴の貫通穴内にレ
ンズ材料を配置し、このレンズ材料を成形可能な温度に
加熱した状態で、前記貫通穴内に配置したパンチを介し
て前記レンズ材料を所定のレンズ形状に成形した後前記
レンズ材料を冷却固化させることにより、前記鏡胴と前
記レンズ材料とを一体的に係止したことを特徴とするレ
ンズ成形方法である。Structure of the Invention The present invention involves placing a lens material in a through hole of a lens barrel having a through hole, heating the lens material to a temperature at which it can be molded, and then inserting the lens material through a punch placed in the through hole. The lens molding method is characterized in that the lens barrel and the lens material are integrally locked by molding the lens material into a predetermined lens shape and then cooling and solidifying the lens material.

実施例の説明 第４図は本発明の一実施例におけるレンズ成形時の要部
断面図を示すもので、１１は上パンチ、１２は下パンチ
を示す。円柱状の金属部材からなる上パンチ１１および
下パンチ１２はそれぞれ一方の端面にパンチ中心軸と直
交した形で精度よく所定の成形レンズ形状を構成する成
形金型面１３゜１４を有し、金型面は所定の鏡面に仕上
げである。DESCRIPTION OF THE EMBODIMENTS FIG. 4 shows a sectional view of a main part during lens molding in an embodiment of the present invention, where 11 indicates an upper punch and 12 indicates a lower punch. The upper punch 11 and the lower punch 12, which are made of cylindrical metal members, each have mold surfaces 13° and 14 on one end surface that are perpendicular to the punch center axis and form a predetermined molded lens shape with high precision. The mold surface is finished to a predetermined mirror surface.

本発明の実施例では凸レンズを得るため、パンチの金型
面形状をそれぞれ凹面とした。In the embodiment of the present invention, in order to obtain a convex lens, the mold surface shape of each punch was made concave.

円筒状スリーブ等の形状からなるアルミニウム製鏡胴１
６の内径は成形金型面１３．１４を有する上バンチ１１
および下パンチ１２の外径と摺動可能にしつくシはめ合
う様所定の精度に製作している。Aluminum lens barrel 1 consisting of a cylindrical sleeve, etc.
The inner diameter of 6 is the upper bunch 11 with the mold surface 13.14.
It is manufactured to a predetermined precision so as to be slidably and tightly fitted to the outer diameter of the lower punch 12.

鏡胴１６はすなわち粉末成形時において、成形されるべ
き粉末の外径を規制するダイスの役割をはたすことにな
る。In other words, the lens barrel 16 plays the role of a die that regulates the outer diameter of the powder to be molded during powder molding.

１５は前記上パンチ１１．下パンチ１２．鏡胴１６によ
りて構成された内部空間に配置されたアクリル、スチロ
ール、ポリカーボネート等の部材からなる樹脂材料であ
シ、所定の成形レンズ形状容積と同量で所定量に計量さ
れている。本実施例では球形状をした樹脂材料１５を供
給しているが、これは所定の凸レンズ形状を得るにはパ
ンチの成形金型面１３．１４が両方共凹面であるがため
に、上下パンチ１１．１２で樹脂材料１６を押圧成形し
た際前記内部空間内にある空気をスムーズに鏡胴１６外
へ逃がすためである。成形金型を構成する上下パンチ１
１　、’１２の成型金型面１３．１４が両方共晶形状の
場合は単なる円板上の樹脂材料を供給すればよいが、メ
ニスカスレンズの様に片側凸面１片側凹面の場合には、
本実施例のごとく球形状の樹脂材料を供給する方が望ま
しい。15 is the upper punch 11. Lower punch 12. A resin material made of acrylic, styrene, polycarbonate, or the like is placed in the internal space formed by the lens barrel 16, and is measured to a predetermined amount equal to the volume of a predetermined molded lens shape. In this embodiment, a spherical resin material 15 is supplied, but this is because both the mold surfaces 13 and 14 of the punch are concave in order to obtain a predetermined convex lens shape. This is to allow the air present in the internal space to smoothly escape to the outside of the lens barrel 16 when the resin material 16 is press-molded in step 12. Upper and lower punches 1 that make up the molding die
1. If the mold surfaces 13 and 14 of '12 are both eutectic, it is sufficient to supply a simple disk-shaped resin material, but in the case of a meniscus lens where one side is convex and the other side is concave,
It is preferable to supply a spherical resin material as in this embodiment.

第４図のごとく成形ブロック全体、すなわち、上パンチ
１１．下パンチ１２およびこれら上下ノくンチと鏡胴１
６とによって構成された内部空間に配置した樹脂材料１
５の全体を所定温度に加熱した後、上パンチ１１および
下パンチ１２の成形金型面１３．１４を介して圧力Ｐを
加え、所定のレンズ面形状を軟化した樹脂材料１５に転
写させる。As shown in FIG. 4, the entire forming block, that is, the upper punch 11. Lower punch 12 and these upper and lower punches and lens barrel 1
Resin material 1 placed in the internal space constituted by 6 and
After heating the entire lens 5 to a predetermined temperature, pressure P is applied via the mold surfaces 13 and 14 of the upper punch 11 and the lower punch 12 to transfer a predetermined lens surface shape onto the softened resin material 15.

その後、成形ブロック全体を、冷却せしめると第５図の
ごとくとなシ、成形されたレンズ１８は供給した樹脂材
料１５の計量分だけの容積をもつレンズ１了の厚となる
。したがって、レンズ面形状、レンズ厚さは常に高精度
に成形され、樹脂材料１６が、加熱、加圧、冷却、固化
の各工程を経たのち、上バンチ１１．下パンチ１２を取
シはずすと第６図の様に、本発明の目的とする鏡胴１６
およびレンズ１７が一体となった形状でレンズ成形を完
了する。Thereafter, when the entire molded block is cooled, the molded lens 18 becomes as thick as the lens 18 having a volume equal to the measured amount of the supplied resin material 15, as shown in FIG. Therefore, the lens surface shape and lens thickness are always molded with high precision, and after the resin material 16 goes through the steps of heating, pressurizing, cooling, and solidifying, the upper bunch 11. When the lower punch 12 is removed, the lens barrel 16 which is the object of the present invention is shown in FIG.
The lens molding is then completed with the lens 17 integrated.

ここで、加熱温度、成形圧力Ｐの関係は重要であシ、レ
ンズ１７に加える圧力を考え、それぞれの条件を設定し
なければならない。又樹脂材料１５の供給は所望するレ
ンズ１７形状の容積と同量にしかも精密に計量する必要
がある。Here, the relationship between heating temperature and molding pressure P is important, and each condition must be set while considering the pressure to be applied to the lens 17. Further, it is necessary to supply the resin material 15 in an amount equal to the volume of the desired lens 17 shape, and to precisely measure the amount.

本実施例では鏡胴１６の形状として円筒状スリーブを使
用した例を述べたが、鏡胴形状については任意であるこ
とはいうまでもない。In this embodiment, an example is described in which a cylindrical sleeve is used as the shape of the lens barrel 16, but it goes without saying that the shape of the lens barrel may be arbitrary.

また第７図に示すように例えば鏡胴の外側面にねじ部１
８や外側面溝部１９を設けることにより、ねじ部１８．
溝部１９がコーティング時の取付治具としても利用する
ことが可能であり、しかも機器本体への増刊用としても
利用出来る。さらに鏡胴材料についても任意でアルミニ
ウム以外に、高温下で成形可能で熱膨張係数がよく合っ
たセラミックス材料や、熱硬化性の樹脂を所定形状に形
成してよいことも同様である。又本実施例ではレンズ１
７の材料として透明樹脂部材を用いた例を述べたが、供
給される材料がガラス等レンズを構成する部材であれば
任意であることも同様である。In addition, as shown in FIG.
8 and the outer surface groove portion 19, the threaded portion 18.
The groove portion 19 can be used as a mounting jig during coating, and can also be used as an extra edition to the main body of the device. Furthermore, as for the lens barrel material, in addition to aluminum, a ceramic material that can be molded at high temperatures and has a well-matched coefficient of thermal expansion, or a thermosetting resin may be optionally formed into a predetermined shape. In addition, in this embodiment, lens 1
Although an example has been described in which a transparent resin member is used as the material of No. 7, the material supplied may be any material such as glass that constitutes a lens.

発明の効果 以上の説明からも明らかなように本発明は従来のように
鏡胴とレンズとを、個別の部品として製作して後、両者
を組合せて一体化するものでなくレンズ成形工程におい
て両者の一体化を行なうもので、従来の組立作業を排す
るだけでなく、後工程の作業性においても非常に簡単で
成形されたレンズも鏡胴内で保護されているためキズの
発生が皆無となるなど優れた効果を有している。さらに
両者一体径の形状精度は上パンチ、下ノくンチおよび鏡
胴の配置状態を適切に保つことで従来の組立法に較べば
らつきの少ない安定で高精度を有する一体成形レンズを
提供することが可能となる。Effects of the Invention As is clear from the above explanation, the present invention does not involve manufacturing the lens barrel and lens as separate parts and then combining them into one body, as in the past, but by combining them in the lens molding process. This not only eliminates the traditional assembly work, but also makes post-process work much easier, and since the molded lens is protected within the lens barrel, there is no chance of scratches. It has excellent effects such as: Furthermore, by properly maintaining the arrangement of the upper punch, lower punch, and lens barrel, it is possible to provide a stable and highly accurate integrally molded lens with less variation than with conventional assembly methods. It becomes possible.

【図面の簡単な説明】[Brief explanation of drawings]

第１図、第２図、第３図は従来のレンズと鏡胴との関係
を示す要部断面図、第４図は本発明の実施例の方法にお
けるレンズ成形時を説明する要部断面図、第６図は同方
法におけるレンズ成形完了時を説明する要部断面図、第
６図は同レンズ成形法で得られた成形レンズの断面図、
第７図は本発明の他の実施例の方法を説明するだめの断
面図である。 １・・・・・・鏡胴、２・・、・１位置決め凸部、３，
３′・・・レンズ、５・・・、鏡胴内面、６，６′・・
・・・レンズ光軸、７・・・・・・鏡胴中心軸、１１　
・・・・上パンチ、１２・・・・下パンチ、１３．１３
・・・・・・レンズ成形金型面、１６・・・・・・樹脂
材料、１６・・・・・・鏡胴、１７・・・・成形レンズ
、１８・・・・・ねじ部、１９・・・・・・外側面溝部
。 代理人の氏名　弁理士　中　尾　敏　男　ほか１名＠１
図 ｆ 第３図 ２′Ｏど 第５図FIGS. 1, 2, and 3 are sectional views of main parts showing the relationship between a conventional lens and a lens barrel, and FIG. 4 is a sectional view of main parts illustrating the lens forming process in the method of the embodiment of the present invention. , FIG. 6 is a cross-sectional view of a main part explaining the completion of lens molding in the same method, FIG. 6 is a cross-sectional view of a molded lens obtained by the same lens molding method,
FIG. 7 is a cross-sectional view illustrating a method according to another embodiment of the present invention. 1... Lens barrel, 2..., 1 positioning convex portion, 3,
3'...Lens, 5..., Lens barrel inner surface, 6, 6'...
... Lens optical axis, 7 ... Lens barrel center axis, 11
...Upper punch, 12...Lower punch, 13.13
... Lens mold surface, 16 ... Resin material, 16 ... Lens barrel, 17 ... Molded lens, 18 ... Threaded part, 19 ...Outside groove. Name of agent: Patent attorney Toshio Nakao and 1 other person @1
Figure f Figure 3 2'O Figure 5

Claims (1)

【特許請求の範囲】[Claims] 貫通穴を有してなるレンズ鏡胴の貫通穴内にレンズ材料
を配置し、前記レンズ材料を成形可能な所定温度に加熱
した状態で、前記貫通穴内に配置したパンチを介して前
記レンズ材料を所定のレンズ形状に成形するとともに前
記レンズ鏡胴と前記レンズ材料とを一体的に係止したこ
とを特徴とするレンズ成形方法。A lens material is placed in a through hole of a lens barrel having a through hole, and while the lens material is heated to a predetermined temperature at which it can be molded, the lens material is heated to a predetermined temperature through a punch placed in the through hole. A method for molding a lens, characterized in that the lens barrel and the lens material are integrally locked together.