JPS6353522B2 - - Google Patents

Info

Publication number
JPS6353522B2
JPS6353522B2 JP58235753A JP23575383A JPS6353522B2 JP S6353522 B2 JPS6353522 B2 JP S6353522B2 JP 58235753 A JP58235753 A JP 58235753A JP 23575383 A JP23575383 A JP 23575383A JP S6353522 B2 JPS6353522 B2 JP S6353522B2
Authority
JP
Japan
Prior art keywords
lens
molded
lens barrel
barrel
shape
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
Application number
JP58235753A
Other languages
Japanese (ja)
Other versions
JPS60126610A (en
Inventor
Shoji Nakamura
Isamu Yano
Kaoru Shimizu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP23575383A priority Critical patent/JPS60126610A/en
Publication of JPS60126610A publication Critical patent/JPS60126610A/en
Publication of JPS6353522B2 publication Critical patent/JPS6353522B2/ja
Granted legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02Mountings, adjusting means, or light-tight connections, for optical elements for lenses

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lens Barrels (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

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
集光レンズ、カメラレンズ、拡大鏡といつた種々
のレンズと該レンズを保持するための鏡胴とを一
体化する成形レンズの製造方法に関するもので、
高精度のレンズ形状で、かつレンズと鏡胴の組立
を不要にした成形レンズを提供するものである。
DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to various lenses used in optical equipment, such as laser condensing lenses, camera lenses, and magnifying glasses, and lens barrels for holding the lenses. This relates to a method of manufacturing a molded lens that integrates
To provide a molded lens that has a highly accurate lens shape and 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、接着といつた方法でレンズ
を固定する作業がなされていた。
Conventional configuration and its problems Conventionally, the lens and lens barrel were manufactured as separate parts, and then they were manufactured as separate parts without sacrificing the original performance of the lens.
The lens was fixed inside the lens barrel using methods such as screwing and gluing.

例えば樹脂材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り出し、成形ゲートの
切断、レンズ面に反射防止膜のコーテイング、ハ
ードコーテイング、さらに鏡胴内への組み込み、
固定といつた工程を経て、初めてレンズと鏡胴と
が一体化される。
For example, in injection molded lenses using resin materials,
After molding the lens, remove it from the mold, cut the molding gate, coat the lens surface with anti-reflection film, hard coat it, and then assemble it into the lens barrel.
After the fixing process, the lens and barrel are first integrated.

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。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が悪いと機器とレン
ズ間で光軸の調整をするためのアジヤスト機構が
必要となる。
The disadvantage of lenses using general resin materials is that the hardness of the material is soft, so after the lens is molded,
During the assembly process into the lens barrel, the lens surface is easily scratched, which not only deteriorates the original performance of the molded lens but also reduces its value as a product. Furthermore, as a problem when incorporating it into the lens barrel,
Basically, the problem is how to match the optical axis of the lens with the central axis of the lens barrel and fix it 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 one of them is inaccurate, 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
させなくてはならない。
Particularly in the case of a combination of two or more lenses, it is even more difficult to align the optical axes of the lenses coaxially 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
要部断面図であり、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5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はほぼ一致している。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5の寸法バラツキ、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. 1st
3 are cross-sectional views of main parts showing the relationship between a conventional lens and a lens barrel, and a convex portion 2 for lens positioning is provided on the inner surface 5 of a cylindrical lens barrel 1 as shown in FIG.
The lens 3 is supported and fixed between the convex portion 2 and the inner surface 5 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 substantially coincide. 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 5, and poor orthogonality of the convex portion 2 with respect to the central axis 7, the relationship between the lens optical axis 6 and the central axis 7 will change as shown in Figure 2. Doesn't match like.

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
くことになりこのような場合、組合せレンズとし
ての機能を有さないものとなる。第2図は前述し
たように、機器側に設けられたアジヤスト機構に
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。上述
した種々の欠点を有することは、例えばレーザ集
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つた致命的なものも
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、生産
面の両面から改善が望まれていた。
Furthermore, as mentioned above, if the shape precision of the lens 3 and lens barrel 1 is poor, the lenses 3 and 3'
The relationship between the lens optical axes 6 and 6' will further vary, and in such a case, the lens will not function as a combination lens. As mentioned above in FIG. 2, it is possible to adjust the device and the lens optical axis 6 using the adjust mechanism provided on the device side, but in the combination lens as shown in FIG. Furthermore, 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. Some of the above-mentioned drawbacks are fatal, such as the fact that laser beams cannot be focused within a predetermined size range in terms of performance, such as in laser focusing lenses. Furthermore, as the outer diameter of the lens 3 has become smaller, assembly and fixing operations have become more difficult, and improvements have been desired in terms of both performance and 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ものである。
Purpose of the Invention The present invention aims to solve the various problems mentioned above.
In the relationship between the lens and the lens barrel that holds the lens, by molding the lens inside the lens barrel, the lens and the lens barrel are integrated with their central axes aligned, resulting in high precision. This provides an inexpensive molded lens.

発明の構成 本発明の成形レンズの製造方法は、側面に複数
個の貫通孔が設けられた鏡胴内にレンズ材料を供
給し、前記レンズ材料の一部が前記貫通孔内に流
入して固化するように前記レンズ材料を加圧成形
することを特徴とするものである。
Structure of the Invention In the method for manufacturing a molded lens of the present invention, a lens material is supplied into a lens barrel having a plurality of through holes on the side surface, and a part of the lens material flows into the through holes and solidifies. It is characterized in that the lens material is pressure molded so as to.

実施例の説明 以上の構成に基づき本発明の一実施例を図面と
ともに説明する。
DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described based on the above configuration with reference to the drawings.

第4図は本発明の一実施例における成形レンズ
の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
仕上げてある。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。
FIG. 4 shows a sectional view of a main part during molding of a molded lens according to an embodiment of the present invention, in which 11 represents an upper punch and 12 represents 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 form a predetermined molded lens shape with high precision and perpendicular to the punch center axis. , the mold surface is finished to a predetermined mirror surface. 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16の側面には貫通孔17が等間隔に複数
個設けてあり、内径は成形金型面13,14を有
する上パンチ11および下パンチ12の外径と摺
動可能にしつくりはめ合う様所定の精度に製作し
ている。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。15は前記上パンチ
11、下パンチ12、鏡胴16によつて構成され
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
り、所定の成形レンズ形状容積よりも若干多く所
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1
3,14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15を押圧成形した際、
前記内部空間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11,12の成形金型面13,14が両方共
凸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、
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。なおスペーサ
19は成形レンズの厚み寸法を制御するもので上
パンチ11の矢印方向移動量を所定に規制する役
割を果す。
A plurality of through holes 17 are provided at equal intervals on the side surface of an aluminum lens barrel 16 having a shape such as a cylindrical sleeve. It is manufactured to a specified precision so that it can slide against the diameter and fit together. 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 is an acrylic, styrene,
It is a resin material made of a member such as polycarbonate, and is measured to a predetermined amount slightly larger than the predetermined molded lens shape volume. In this embodiment, a spherical resin material 15 is supplied, but in order to obtain a predetermined convex lens shape, it is necessary to
3 and 14 are both concave, when the resin material 15 is press-molded with the upper and lower punches 11 and 12,
This is to allow the air in the internal space to escape smoothly to the outside of the lens barrel 16. If the mold surfaces 13 and 14 of the upper and lower punches 11 and 12 constituting the mold are both convex, it is sufficient to supply the resin material on a simple disk, but if the mold surface is convex on one side, like a meniscus lens,
In the case of a concave surface on one side, it is preferable to supply a spherical resin material as in this embodiment. Note that the spacer 19 controls the thickness of the molded lens, and serves to regulate the amount of movement of the upper punch 11 in the direction of the arrow.

第4図のごとく成形ブロツク全体、すなわち、
上パンチ11、下パンチ12およびこれら上下パ
ンチと鏡胴16とによつて構成された内部空間に
配置した樹脂材料15およびスペーサー19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 molded block, ie,
After heating the entirety of the upper punch 11, the lower punch 12, the resin material 15 and the spacer 19 arranged in the internal space constituted by these upper and lower punches and the lens barrel 16 to a predetermined temperature, the upper punch 11 and the lower punch 12 are heated. A pressure P is applied through the molding mold surfaces 13 and 14 to transfer a predetermined lens surface shape to the softened resin material 15.

上パンチ11がスペーサー19に当接する状態
にまで加圧状態を保持し、その後、成形ブロツク
全体を、冷却せしめると第5図のごとくとなり、
成形されたレンズ18はスペーサー19によつて
所定のレンズ厚みが保たれる。上パンチ11がス
ペーサ19に当接した状態において、樹脂材料1
5は所定形状のレンズ18を形成するとともに、
レンズ18の形状に必要な容積以外の樹脂材料1
5は貫通孔17の中にも流入し固化することにな
る。
The pressurized state is maintained until the upper punch 11 comes into contact with the spacer 19, and then the entire molded block is cooled, as shown in Fig. 5.
The molded lens 18 is maintained at a predetermined thickness by a spacer 19. With the upper punch 11 in contact with the spacer 19, the resin material 1
5 forms a lens 18 of a predetermined shape, and
Resin material 1 other than the volume required for the shape of the lens 18
5 also flows into the through hole 17 and solidifies.

したがつて、レンズ面形状、レンズ厚さは常に
高精度に成形され、供給樹脂材料の容量バラツキ
は貫通孔への流入樹脂量のバラツキとなつて吸収
される。樹脂材料15が、加熱、加圧、冷却、固
化の各工程を経たのち、上パンチ11、下パンチ
12を取りはづすと第6図の様に、本発明の目的
とする鏡胴16およびレンズ18が貫通孔17に
流入した樹脂材料15を介して一体となつた形状
でレンズ成形を完了する。
Therefore, the lens surface shape and lens thickness are always molded with high precision, and variations in the volume of the supplied resin material are absorbed as variations in the amount of resin flowing into the through holes. After the resin material 15 has gone through the heating, pressurizing, cooling, and solidifying steps, the upper punch 11 and the lower punch 12 are removed, and as shown in FIG. Lens molding is completed in a shape in which the lens 18 is integrated through the resin material 15 that has flowed into the through hole 17.

ここで、加熱温度、成形圧力P、および貫通孔
17の関係は重要であり、レンズ18に加える圧
力を考えて、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
18形状の容積よりも若干多くする理由として
は、 1 レンズを所定の形状精度に維持し、余剰分の
樹脂材料は鏡胴側面に設けた貫通孔へ流入させ
る。
Here, the relationship among the heating temperature, molding pressure P, and through hole 17 is important, and each condition must be set in consideration of the pressure to be applied to the lens 18. The reasons for supplying the resin material 15 to be slightly larger than the volume of the desired shape of the lens 18 are as follows: 1. The lens is maintained at a predetermined shape accuracy, and the excess resin material flows into the through hole provided on the side surface of the lens barrel. let

2 鏡胴と成形レンズとを一体的に係止する。2. Integrally lock the lens barrel and molded lens.

ことを目的としたものである。It is intended for this purpose.

本実施例では鏡胴16の形状として円筒状スリ
ーブの側面に複数個の貫通孔17を等間隔に設け
た例を述べたが、鏡胴形状や貫通孔の形状、配置
等については任意であることはいうまでもなく、
第7図に示すような鏡胴16の内面の樹脂の余剰
分が流入するポケツト20を有する構造において
も同じ効果が得られた。すなわち、レンズ材料自
身と鏡胴とを一体的に係止したものであり、レン
ズおよび鏡胴を構成する材料以外に特に接着剤を
必要としないものである。
In this embodiment, the shape of the lens barrel 16 is described as an example in which a plurality of through holes 17 are provided at equal intervals on the side surface of a cylindrical sleeve, but the shape of the lens barrel and the shape and arrangement of the through holes are arbitrary. Needless to say,
The same effect was obtained in a structure having a pocket 20 into which the excess resin on the inner surface of the lens barrel 16 flows, as shown in FIG. That is, the lens material itself and the lens barrel are integrally locked together, and no adhesive is required in addition to the materials constituting the lens and the lens barrel.

また第7図に示すように例えば鏡胴の外側面に
ねじ部21や外側面溝部22を設けることによ
り、ねじ部21、溝部22がコーテイング時の取
付治具としても利用することが可能であり、しか
も機器本体への取付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つ
たセラミツクス材料や、熱硬化性の樹脂を所定形
状に形成してもよいことも同様である。又本実施
例では、レンズ18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。
Further, as shown in FIG. 7, for example, by providing a threaded portion 21 and an outer surface groove portion 22 on the outer surface of the lens barrel, the threaded portion 21 and groove portion 22 can be used as a mounting jig during coating. Moreover, it can also be used for attachment to the main body of the device. Furthermore, as for the material of the lens barrel, other than 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. Further, in this embodiment, an example is described in which a transparent resin member is used as the material of the lens 18, but the material supplied may be any material that constitutes the lens, such as glass.

発明の効果 以上の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た後、両者を組
合せて一体化するものでなく、レンズ成形におい
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、後工程の作業おいても成形
されたレンズを鏡胴内で保護することができると
ともに、レンズを位置決めするためにレンズに触
れる必要もないため、キズの発生が皆無となる。
さらに両者一体後の形状精度は、例えば実施例の
上パンチ11、下パンチ12からなる加圧成形手
段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 described above, the present invention does not involve fabricating the lens barrel and lens as separate parts and then combining them to integrate them as in the past, but instead integrates them during lens molding. This not only eliminates the traditional assembly work, but also protects the molded lens within the lens barrel during post-process work, and there is no need to touch the lens to position it. No scratches will occur.
Furthermore, the shape accuracy after the two are integrated can be stabilized with less variation compared to conventional assembly methods by properly maintaining the arrangement of the pressure forming means consisting of the upper punch 11 and lower punch 12 in the embodiment and the lens barrel. It becomes possible to provide an integrally molded lens with high precision.

【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
施例における成形レンズのレンズ成形時を説明す
るための要部断面図、第5図は本発明の実施例に
おける成形レンズのレンズ成形完了時を説明する
ための要部断面図、第6図は完成した本発明の実
施例による成形レンズの断面図、第7図は本発明
の他の実施例の成形レンズの断面図である。 1……鏡胴、2……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、1
2……下パンチ、13,14……レンズ成形金型
面、15……樹脂材料、16……鏡胴、17……
貫通孔、18……成形レンズ、19……スペー
サ、20……内面凹部、21……ねじ部、22…
…外側面溝部。
1, 2, and 3 are main part sectional views showing the relationship between a conventional lens and a lens barrel, and FIG. 4 is a main part for explaining the lens molding process of a molded lens according to an embodiment of the present invention. FIG. 5 is a cross-sectional view of a main part of a molded lens according to an embodiment of the present invention for explaining when lens molding is completed. FIG. 6 is a cross-sectional view of a completed molded lens according to an embodiment of the present invention. FIG. 7 is a sectional view of a molded lens according to another embodiment of the present invention. 1... Lens barrel, 2... Positioning protrusion, 3, 3'...
... Lens, 5 ... Lens barrel inner surface, 6, 6' ... Lens optical axis, 7 ... Lens barrel center axis, 11 ... Upper punch, 1
2... Lower punch, 13, 14... Lens mold surface, 15... Resin material, 16... Lens barrel, 17...
Through hole, 18... Molded lens, 19... Spacer, 20... Inner surface recess, 21... Threaded portion, 22...
...Outside groove.

Claims (1)

【特許請求の範囲】[Claims] 1 側面に複数個の貫通孔が設けられた鏡胴内に
レンズ材料を供給し、前記レンズ材料の一部が前
記貫通孔内に流入して固化するように前記レンズ
材料を加圧成形する成形レンズの製造方法。
1 Molding in which a lens material is supplied into a lens barrel with a plurality of through holes provided on the side surface, and the lens material is pressure-molded so that a portion of the lens material flows into the through holes and solidifies. How to manufacture lenses.
JP23575383A 1983-12-14 1983-12-14 Forming lens Granted JPS60126610A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23575383A JPS60126610A (en) 1983-12-14 1983-12-14 Forming lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23575383A JPS60126610A (en) 1983-12-14 1983-12-14 Forming lens

Publications (2)

Publication Number Publication Date
JPS60126610A JPS60126610A (en) 1985-07-06
JPS6353522B2 true JPS6353522B2 (en) 1988-10-24

Family

ID=16990717

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23575383A Granted JPS60126610A (en) 1983-12-14 1983-12-14 Forming lens

Country Status (1)

Country Link
JP (1) JPS60126610A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2907016B2 (en) * 1994-09-05 1999-06-21 松下電器産業株式会社 Optical element
JP4096042B2 (en) * 2002-11-29 2008-06-04 株式会社モールド技術研究所 Lens with lens barrel and manufacturing method thereof
JP2006163126A (en) * 2004-12-09 2006-06-22 Olympus Corp Optical component integrated to frame and manufacturing method of optical component integrated to frame
US8300328B2 (en) * 2007-07-03 2012-10-30 Optomecha Co., Ltd. Lens unit composed of different materials and camera module and method for manufacturing the same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4916538A (en) * 1972-06-07 1974-02-14

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57130807U (en) * 1981-02-06 1982-08-14

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4916538A (en) * 1972-06-07 1974-02-14

Also Published As

Publication number Publication date
JPS60126610A (en) 1985-07-06

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