JPS60252311A - Spherical lens holding device - Google Patents

Spherical lens holding device

Info

Publication number
JPS60252311A
JPS60252311A JP10738884A JP10738884A JPS60252311A JP S60252311 A JPS60252311 A JP S60252311A JP 10738884 A JP10738884 A JP 10738884A JP 10738884 A JP10738884 A JP 10738884A JP S60252311 A JPS60252311 A JP S60252311A
Authority
JP
Japan
Prior art keywords
ball lens
pin
holding device
hole
tapered hole
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.)
Pending
Application number
JP10738884A
Other languages
Japanese (ja)
Inventor
Akira Okamoto
明 岡本
Tadao Shingyoji
真行寺　唯夫
Michitoshi Nakaya
中屋　道利
Shigeki Watanabe
茂樹 渡辺
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP10738884A priority Critical patent/JPS60252311A/en
Publication of JPS60252311A publication Critical patent/JPS60252311A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/027—Mountings, adjusting means, or light-tight connections, for optical elements for lenses the lens being in the form of a sphere or ball

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lens Barrels (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

PURPOSE:To eliminate the variance of a lens holding force and a shortage of the holding force by providing plural pin holes opening to the inside face of a taper hole of a metallic holder radially with respect to the axial line of this taper hole and fixing and holding a spherical lens in the taper hole by tip parts of pins fixed to individual pin holes. CONSTITUTION:A taper hole 21 for holding a spherical lens 20 is provided in the center part of a metallic holder 16 with the same center as the axial line, and four pin holes 24 are provided radially with respect to this axial line. Since the axial line of each pin hole 24 is deflected to the taper large-diameter side off a center O1 of the spherical lens 20 abutted on the inside face of the taper hole 21, a tip part 26 of a pin 25 screwed into each pin hole 24 is projected to the inside of the taper hole 21 and is brought into contact with the surface of the spherical lens 20 to prevent the spherical lens 20 from slipping to the large- diameter side of the taper hole 21. Since the tip part 26 of each pin 25 is formed hemispherically, flaws on the surface of the spherical lens 20 are prevented.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は球レンズ保持装置に関し、更に詳しくは、単一
モード用レーザダイオード・モジュール（以下ＳＭ用Ｌ
Ｄモジュールという）に有効に通用できる球レンズ保持
装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a ball lens holding device, and more specifically, to a single mode laser diode module (hereinafter referred to as SM L
This invention relates to a ball lens holding device that can be effectively used in the D module.

〔従来技術〕[Prior art]

従来から、レーザダイオード素子（以下ＬＤ素子という
）に取り付けられるホルダと単一モード光ファイバ（以
下３Ｍ光フアイバという）の端部を保持するホルダとの
間に球レンズを保持する保持装置を設けてなるＳＭ用Ｌ
Ｄモジユールが知られている。この種のＳＭ用ＬＤモジ
ユールにおいては、ＬＤ素子の出力光を正しく集束させ
て３Ｍ光フアイバの微小径のコアに正しく結合させる必
要があるため、球レンズをその保持装置に保持さ−せる
にあたっては種々の注意が必要である。Conventionally, a holding device for holding a ball lens has been provided between a holder attached to a laser diode element (hereinafter referred to as LD element) and a holder that holds the end of a single mode optical fiber (hereinafter referred to as 3M optical fiber). Naru SM L
D module is known. In this type of SM LD module, it is necessary to correctly focus the output light of the LD element and properly couple it to the minute diameter core of the 3M optical fiber, so when holding the ball lens in the holding device, it is necessary to Various precautions are required.

従来の球レンズ保持装置は、第４図に示すように、球レ
ンズ１の径よりも僅かに小さい内径の保持穴３を有する
金属ホルダ２を備えており、球レンズｌはこの金属ホル
ダ２の保持穴３内に圧入されている。この保持穴３は軸
線方向に均一な内径を有していて金属ホルダ２の両端面
に開口している。As shown in FIG. 4, the conventional ball lens holding device includes a metal holder 2 having a holding hole 3 with an inner diameter slightly smaller than the diameter of the ball lens 1. It is press-fitted into the holding hole 3. This holding hole 3 has a uniform inner diameter in the axial direction and is open at both end surfaces of the metal holder 2.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

しかしながら、従来の上記構造の球レンズ保持装置にお
いては次のような問題が生している。However, the following problems occur in the conventional ball lens holding device having the above structure.

■　金属ホルダの保持穴の穴開は精度のばらつきにより
球レンズの保持力にばらつきが生じ、その結果、保持力
が不足したり、圧入時に球レンズに無理な外力が加わっ
たりすることがある。この圧力により球レンズにひずみ
が加わり、球レンズに複屈折性を発生させる原因にもな
る。■Due to variations in accuracy when drilling the holding holes in the metal holder, the holding force for the ball lens may vary, resulting in insufficient holding force or excessive external force being applied to the ball lens during press-fitting. This pressure adds strain to the ball lens, which causes birefringence to occur in the ball lens.

■　圧入時に球レンズの頂点を押ずため、球レンズの表
面にキズがつき易くなる。■ Because the apex of the ball lens is pressed during press-fitting, the surface of the ball lens is easily scratched.

■　金属ホルダに保持された球レンズの表面には、通窩
、無反射被膜の蒸着コーティングが行われる。コーティ
ング中に球レンズ及び金属ホルダは加熱されるが、球レ
ンズが金属ホルダ内に圧入されていると、レンズとホル
ダとの熱膨張係数の差によりレンズが移動し易くなる。■ The surface of the spherical lens held in the metal holder is coated with a through hole and a non-reflective coating by vapor deposition. The ball lens and metal holder are heated during coating, but if the ball lens is press-fitted into the metal holder, the difference in thermal expansion coefficients between the lens and the holder makes it easier for the lens to move.

このため、無反射被膜の蒸着温度を一定以上に高めるこ
とが困難となり、十分なハードコーティングが困難とな
る。For this reason, it becomes difficult to raise the deposition temperature of the non-reflective coating above a certain level, making it difficult to achieve a sufficient hard coating.

■　硬質の金属ホルダを用いると球レンズの圧入の際に
球レンズが割れる虞れがある。このため、金属ホルダの
材質が限定される。こうした理由により、一般には、金
属ホルダは黄銅により作られているが、黄銅と球レンズ
との熱膨張係数には大きな差があるため、上記■で述べ
た問題が生じることとなる。■ If a hard metal holder is used, there is a risk that the ball lens will break when it is press-fitted. Therefore, the material of the metal holder is limited. For these reasons, metal holders are generally made of brass, but since there is a large difference in the coefficient of thermal expansion between brass and ball lenses, the problem described in item (2) above occurs.

■　金属ホルダにおける均一内径の保持穴内に球レンズ
を圧入するため、金属ホルダに対する球レンズの位置精
度、即ち、金属ホルダの端面から球レンズの表面までの
距離の精度を出すことが難しい。(2) Since the ball lens is press-fitted into a holding hole with a uniform inner diameter in the metal holder, it is difficult to obtain the positional accuracy of the ball lens relative to the metal holder, that is, the accuracy of the distance from the end face of the metal holder to the surface of the ball lens.

このため、球レンズを高い位置精度で安定に固定保持す
るための球レンズ保持装置が要望されている。For this reason, there is a need for a ball lens holding device for stably fixing and holding a ball lens with high positional accuracy.

〔問題点を解決するための手段〕[Means for solving problems]

上記問題点を解決するための手段として、本発明は、両
端面と該両端面間に延びる外側面とを有する金属ホルダ
の中央部に球レンズを保持するためのテーパ穴をそれぞ
れ前記金属ホルダの両端面に開口させて設け、該テーパ
穴の第１の開口部の内径を球レンズの直径よりも小径と
するとともに、該テーパ穴の第２の開口部の内径を球レ
ンズの直径よりも大径とし、前記金属ホルダに、一端が
該金属ホルダの外側面に開口し且つ他端が前記テーパ穴
の内面に開口する複数個のピン穴を設け、各ピン穴内に
固定したピンの先端部を前記テーパ穴の内面に当接せし
められた球レンズの中心よりも前記第２開口部側に偏倚
した位置で該球レンズの表面に当接させることにより球
レンズをテーパ穴内に固定保持してなる球レンズ保持装
置を提供する。As a means for solving the above problems, the present invention provides tapered holes for holding a ball lens in the center of a metal holder having both end surfaces and an outer surface extending between the two end surfaces. A first opening of the tapered hole has an inner diameter smaller than the diameter of the spherical lens, and a second opening of the tapered hole has an inner diameter larger than the diameter of the spherical lens. a diameter, and the metal holder is provided with a plurality of pin holes, one end of which opens on the outer surface of the metal holder and the other end of which opens on the inner surface of the tapered hole, and the tip of the pin fixed in each pin hole. The spherical lens is fixedly held within the tapered hole by abutting the surface of the spherical lens at a position offset toward the second opening side from the center of the spherical lens abutting against the inner surface of the tapered hole. A ball lens holding device is provided.

〔作用〕[Effect]

本発明による上記手段によれば、球レンズの位置は球レ
ンズの直径とテーパ穴の形状とによって一義的に定まる
。そして、球レンズはピンの先端部の当接によってその
所定位置に保持される。この固定保持方法によれば、球
レンズに加わる外力を大きく軽減することができるので
、球レンズを高い位置精度で安定に固定保持することが
できることとなる。According to the above means according to the present invention, the position of the ball lens is uniquely determined by the diameter of the ball lens and the shape of the tapered hole. The ball lens is then held in place by the abutment of the tip of the pin. According to this fixing and holding method, the external force applied to the ball lens can be greatly reduced, so the ball lens can be stably fixed and held with high positional accuracy.

〔実施例〕〔Example〕

以下、図面の第１図ないし第３図を参照して本発明の一
実施例を説明する。Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3 of the drawings.

第１図は本発明による球レンズ保持装置をＳＭ用ＬＤモ
ジュールに適用した例を示している。この図において、
ＳＭ用ＬＤモジュールはＬＤ素子１１上に取り付けられ
たホルダ１２と３Ｍ光ファイバ１３の端部を保持するた
めのホルダ１４との間に配置された球レンズ保持装置１
５を備えている。球レンズ保持装置１５は金属ホルダ１
６を備えている。この金属ホルダ１６は両端面１７，１
８と両端面１７．１８間に延びる円筒状の外側面１９と
を有している。この金属ボルダ１６の中心軸線はＬＤ素
子１１のレーザ光出力部の中心及び３Ｍ光ファイバ１３
のコアの中心軸線と整列するように高い精度で配置され
る。ホルダ１２，１４゜１６は例えばレーザ溶接により
互いに固着される。FIG. 1 shows an example in which the ball lens holding device according to the present invention is applied to an LD module for SM. In this diagram,
The SM LD module includes a ball lens holding device 1 disposed between a holder 12 attached to an LD element 11 and a holder 14 for holding the end of a 3M optical fiber 13.
It is equipped with 5. Ball lens holding device 15 is metal holder 1
It is equipped with 6. This metal holder 16 has both end surfaces 17,1
8 and a cylindrical outer surface 19 extending between the end surfaces 17,18. The central axis of this metal boulder 16 is the center of the laser beam output part of the LD element 11 and the 3M optical fiber 13.
is placed with high precision so as to be aligned with the central axis of the core. The holders 12, 14 and 16 are fixed to each other by, for example, laser welding.

金属ホルダ１６の中央部には球形の球レンズ２０を保持
するためのテーパ穴２１が金属ホルダの１６の中心軸線
と同心に設けられている。このテーパ穴２１は金属ホル
ダ１６の一方の端面１７に位置する小径の第１開口部２
２と金属ホルダの他方の端面１８に位置する大径の第２
開口部２３とを有している。第１図から明らかなように
、テーパ穴２１の第１開口部２２の内径は球レンズ２０
の直径よりも小径となっており、一方、テーパ穴２１の
第２開口部２３の内径は球レンズ２０の直径よりも大径
となっている。A tapered hole 21 for holding a spherical lens 20 is provided in the center of the metal holder 16 so as to be concentric with the central axis of the metal holder 16. This tapered hole 21 is a small-diameter first opening 2 located on one end surface 17 of the metal holder 16.
2 and a large diameter second one located on the other end surface 18 of the metal holder.
It has an opening 23. As is clear from FIG. 1, the inner diameter of the first opening 22 of the tapered hole 21 is equal to that of the ball lens 2
On the other hand, the inner diameter of the second opening 23 of the tapered hole 21 is larger than the diameter of the spherical lens 20.

第１図及び第２図に示すように、金属ホルダ１６には４
つのビン穴２４が設けられている。各ピン穴２４の一端
は金属ホルダ１６の外側面１９に開口しており、各ピン
穴２４の他端はテーパ穴２１の内面に開口している。こ
こでは、各ピン穴２４の中心軸線はテーパ穴２１内に当
接せしめられた球レンズ２０の中心０１よりも大径の第
２開口部２３側に偏倚している。４つのピン穴２４はテ
ーパ穴２１の中心軸線に対して放射状に配置されている
。As shown in FIGS. 1 and 2, the metal holder 16 has four
Two bottle holes 24 are provided. One end of each pin hole 24 opens to the outer surface 19 of the metal holder 16, and the other end of each pin hole 24 opens to the inner surface of the tapered hole 21. Here, the center axis of each pin hole 24 is biased toward the second opening 23 having a larger diameter than the center 01 of the ball lens 20 abutted in the tapered hole 21 . The four pin holes 24 are arranged radially with respect to the central axis of the tapered hole 21.

各ピン穴２４の内周面にはねじが形成されており、その
ねじに暢合可能なねじを外側面に備えたピン２５が各ピ
ン穴２４にねじ込まれており、各ピン２５の先端部２６
はテーパ穴２１の内方に突出して球レンズ２０の表面に
当接せしめられている。更に詳しくは、各ピン２５の先
端部２６はテーバ穴２１内に当接せしめられた球レンズ
２０の中心０１よりも大径の第２開口部２３側に偏倚し
た位置で球レンズ２０の表面に当接している。したがっ
て、球レンズ２０はテーパ穴２１の第２開口部２３側に
抜は出ることはない。A thread is formed on the inner peripheral surface of each pin hole 24, and a pin 25 having a thread on the outer surface that can fit into the thread is screwed into each pin hole 24, and the tip of each pin 25 is screwed into the pin hole 24. 26
protrudes inward from the tapered hole 21 and comes into contact with the surface of the ball lens 20. More specifically, the tip 26 of each pin 25 touches the surface of the ball lens 20 at a position that is biased toward the second opening 23 having a larger diameter than the center 01 of the ball lens 20 that is brought into contact with the tapered hole 21. are in contact. Therefore, the ball lens 20 does not come out on the second opening 23 side of the tapered hole 21.

ピン２５はピン穴２４に対し蝙合しているので、球レン
ズ２０が滑って動くことを防止できる程度の適度な押圧
力をピン２５のねじ込みによって球レンズ２０の表面に
作用させることができる。Since the pin 25 is fitted into the pin hole 24, an appropriate pressing force that can prevent the ball lens 20 from sliding can be applied to the surface of the ball lens 20 by screwing the pin 25.

球レンズ２０の表面におけるキズの発生を防止するため
に、各ピン２５の先端部２６は半球状に形成されている
。In order to prevent scratches from occurring on the surface of the spherical lens 20, the tip 26 of each pin 25 is formed into a hemispherical shape.

各ピン２５を各ビン穴２４内に固定する手段としてはレ
ーザ溶接、半田付は又は接着剤のうちのいずれか１つを
用いることができる。As a means for fixing each pin 25 in each bottle hole 24, any one of laser welding, soldering, or adhesive can be used.

金属ホルダ１６及びピン２５はそれぞれ球レンズ２０と
熱膨張係数に近い値の金属、例えば、コバール材（登録
商標）と呼ばれる鉄−ニソケルーコバルトの合金である
ことが好ましい。The metal holder 16 and the pin 25 are each preferably made of a metal having a coefficient of thermal expansion close to that of the ball lens 20, for example, an iron-niso-cobalt alloy called Kovar material (registered trademark).

金属ホルダ１６のテーパ穴２１の内面に対する球レンズ
２０の当接位置は球レンズ２０とテーパ穴２１との寸法
及び形状に応じて一義的に定まる。The contact position of the ball lens 20 against the inner surface of the tapered hole 21 of the metal holder 16 is uniquely determined according to the dimensions and shapes of the ball lens 20 and the tapered hole 21.

このため、球レンズ２０に過剰の負荷をかけることなく
球レンズ２０をテーバ穴２１内に位置決めできるのであ
る。もっとも、球レンズ２０をテーパ穴２１内に保持さ
せるため、金属ホルダ１６に対する球レンズ２０の位置
精度が球レンズ２０やテーパ穴２１の寸法公差の範囲内
で許容範囲内に保たれるようにすることが望ましい。こ
の目的を達成するためには、テーバ穴２１のテーバ角度
を少なくとも２６°以上に設定することが好ましい。Therefore, the ball lens 20 can be positioned within the tapered hole 21 without applying an excessive load to the ball lens 20. However, since the ball lens 20 is held within the tapered hole 21, the positional accuracy of the ball lens 20 with respect to the metal holder 16 must be maintained within an allowable range within the dimensional tolerance of the ball lens 20 and the tapered hole 21. This is desirable. In order to achieve this objective, it is preferable that the taper angle of the taper hole 21 is set to at least 26 degrees.

第３図を参照すると、その理由は次の通りである。Referring to FIG. 3, the reason is as follows.

第３図において、球レンズ２０の半径をｒとし、金属ホ
ルダー６におけるテーバ穴２１の小径の第１開口部２２
の半径をａとし、球レンズ２０の表面から金属ホルダ１
６の端面１７までの距離をｅとし、テーバ穴２１のテー
バ角度をθとすると、テーバ角度θ、開口部半径ａ、球
レンズ半径ｒ及び距離ｌとの関係は次式＋１１により定
まる。In FIG. 3, the radius of the spherical lens 20 is r, and the small diameter first opening 22 of the tapered hole 21 in the metal holder 6
Let the radius of be a, and from the surface of the spherical lens 20 to the metal holder 1
Let e be the distance to the end surface 17 of the taper hole 21, and let θ be the Taber angle of the Taper hole 21, then the relationship between the Taber angle θ, the opening radius a, the spherical lens radius r, and the distance l is determined by the following equation +11.

よって、 式（２）から、 Δｌ−Δａ　ｘ　−−−（３１ ｔａｎθ 式（３）により、θ≧４５°の場合、Δｐ≦Δａとなり
、Δａの変化に対しΔβの変化は緩和される。Therefore, from equation (2), Δl-Δax ---(31 tanθ According to equation (3), when θ≧45°, Δp≦Δa, and the change in Δβ is relaxed with respect to the change in Δa.

しかし、一般には、開口部２２の内径２ａの寸法は例え
ばｌ鶴：：、１　と与えられるから、Ｑ、　１１１！１
の公差に対するΔｌの変動の範囲（２・Δａ　＝　０．
１　）を見ればよい。よって、Δｌは、 となる。したがって、θ≧ｊａｎ−１（０，５）　、即
ち、θ≧２６．６°であれば、テーバ穴２１の開口部２
２の内径２ａの公差に対してΔｌは緩和される。However, in general, the dimension of the inner diameter 2a of the opening 22 is given as, for example, 1. Therefore, Q, 111!1
The range of variation of Δl with respect to the tolerance of (2・Δa = 0.
1). Therefore, Δl is as follows. Therefore, if θ≧jan-1(0,5), that is, θ≧26.6°, the opening 2 of the taper hole 21
Δl is relaxed with respect to the tolerance of the inner diameter 2a of 2.

金属ボルダ１６のテーパ穴２１内に固定保持された球レ
ンズ２０の表面には、一般的に、その後無反射被膜の蒸
着コーティングが行われる。The surface of the ball lens 20 fixedly held within the tapered hole 21 of the metal boulder 16 is generally then coated with a non-reflective coating by vapor deposition.

Ｔｉ　０２　、Ｓｉ　０２等のハードコーティングの場
合、コーティング中に球レンズ２０及び金属ホルダ１６
は約２００℃以上に加熱されることとなるが、金属ホル
ダ１６は硬さの制約を受けず、球レンズの熱膨張係数に
近い材料を自由に選択することができるので、何ら支障
なくハードコーティングを行なうことができるようにな
る。In the case of hard coatings such as Ti 02 and Si 02, the ball lens 20 and metal holder 16 are removed during coating.
will be heated to approximately 200°C or higher, but the metal holder 16 is not subject to hardness restrictions and can be freely selected from materials with a coefficient of thermal expansion close to that of the spherical lens, so hard coating can be applied without any problems. You will be able to do this.

以上、一実施例につき説明したが、本発明は上記実施例
の態様のみに限定されるものではなく、特許請求の範囲
に記載した発明の範囲内でその構成要素に種々の変更を
加えることができる。例えば、ピン穴及びピンの個数は
上記個数に限られず、また、金属ホルダやピンの形状は
上記形状に限られない。また、本発明による球レンズ保
持装置はＬＤ素子と３Ｍ光フアイバとの間以外の場所、
例えば３Ｍ光フアイバと３Ｍ光フアイバとの間の光結合
のために用いることもできる。Although one embodiment has been described above, the present invention is not limited to the embodiment described above, and various changes can be made to the constituent elements within the scope of the invention described in the claims. can. For example, the numbers of pin holes and pins are not limited to the above numbers, and the shapes of the metal holders and pins are not limited to the above shapes. Further, the ball lens holding device according to the present invention can be used at a location other than between the LD element and the 3M optical fiber.
It can also be used, for example, for optical coupling between 3M optical fibers.

〔発明の効果〕〔Effect of the invention〕

以」二の説明から明らかなように、本発明による球レン
ズ保持装置においては、球レンズの位置は球レンズの直
径とテーバ穴の形状とによって一義的に定まることとな
り、且つ、球レンズはピンの先端部の当接によってその
所定位置に確実に固定保持されることとなる。したがっ
て、球レンズを高い位置精度で金属ホルダ内に固定保持
させることだできることとなる。As is clear from the following explanation, in the ball lens holding device according to the present invention, the position of the ball lens is uniquely determined by the diameter of the ball lens and the shape of the tapered hole, and the ball lens is The abutment of the distal end ensures that it is fixed and held in its predetermined position. Therefore, the ball lens can be fixedly held within the metal holder with high positional accuracy.

また、球レンズを金属ホルダ内に保持させるに際して球
レンズの表面に圧入等の外力を作用させる必要がないか
−ら、球レンズの表面にキズをつける虞れが全くなくな
る。Furthermore, since there is no need to apply external force such as press fitting to the surface of the ball lens when holding the ball lens in the metal holder, there is no risk of scratching the surface of the ball lens.

更に、球レンズを金属ホルダ内に圧入させる必要がない
から、金属ホルダの材料の硬さによる制限を受けること
はなくなる。このため、球レンズの熱膨張係数に近い材
料を自由に選択できることとなり、球レンズ表面に蒸着
温度の高いハードコーティングを支障なく行なうことが
できるようになる。Furthermore, since there is no need to press-fit the ball lens into the metal holder, there is no longer any restriction due to the hardness of the material of the metal holder. Therefore, a material having a coefficient of thermal expansion close to that of the ball lens can be freely selected, and a hard coating at a high deposition temperature can be applied to the surface of the ball lens without any problem.

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

第１図は本発明の一実施例に係る球レンズ保持装置をＳ
Ｍ用ＬＤモジュールに適用した例を示す断面図、 第２図は第１図に示す球レンズ保持装置の第１図中ｎ−
ｎ線に沿った断面図、 第３図は第１図に示す球レンズ保持装置の要部拡大断面
図、 第４図は従来の球レンズ保持装置の構造を示す断面図で
ある。 １６−金属ホルダ、 １７．１８　一端面、 １９−外側面、 ２０−球レンズ、 ２１−テーバ穴、 ２２・−第１開口部、 ２３−第２開口部、 ２４・−ビン穴、 ２５−　ピン、 ２６−先端部。 特許出願人 富士通株式会社 特許出願代理人 弁理士　青　木　朗 弁理士西舘　和才 弁理士　内　１）　幸　男 弁理士　山　口　昭　之FIG. 1 shows a ball lens holding device according to an embodiment of the present invention.
2 is a cross-sectional view showing an example applied to an M LD module.
3 is an enlarged sectional view of the main part of the ball lens holding device shown in FIG. 1; FIG. 4 is a sectional view showing the structure of a conventional ball lens holding device. 16-metal holder, 17.18 one end surface, 19-outer surface, 20-spherical lens, 21-tapered hole, 22-first opening, 23-second opening, 24-bottle hole, 25-pin , 26-Tip. Patent applicant Fujitsu Limited Patent agent Akira Aoki Patent attorney Nishidate Wazai patent attorney 1) Yukio Patent attorney Akiyuki Yamaguchi

Claims (1)

【特許請求の範囲】 １、両端面と該両端面間に延びる外側面とを有する金属
ホルダの中央部に球レンズを保持するためのテーパ穴を
それぞれ前記金属ホルダの両端面に開口させて設け、該
テーパ穴の第１の開口部の内径を球レンズの直径よりも
小径とするとともに、該テーパ穴の第２の開口部の内径
を球レンズの直径よりも大径とし、前記金属ホルダに、
一端が該金属ホルダの外側面に開口し且つ他端が前記テ
ーパ穴の内面に開口する複数個のピン穴を設け、各ピン
大向に固定したピンの先端部を前記テーパ穴の内面に当
接せしめられた球レンズの中心よりも前記第２開口部側
に偏倚した位置で該球レンズの表面に当接させることに
より球レンズをテーパ穴内に固定保持してなる球レンズ
保持装置。 ２、前記ピン穴の内面と前記ピンの外周面とに互いに端
金するねじが設けられており、前記ピンは前記ピン穴に
螺合した状態で固定されていることを特徴とする特許請
求の範囲第１項に記載の球レンズ保持装置。 ３．４つの前記ピン穴が前記テーパ穴の軸線に対して放
射状に設けられていることを特徴とする特許請求の範囲
第１項に記載の球レンズ保持装置。 ４、球レンズの表面に当接せしめられる前記ピンの先端
部は半球状に形成されていることを特徴とする特許請求
の範囲第１項に記載の球レンズ保持装置。 ５、前記ピンはレーザ溶接、半田付は又は接着剤のうち
のいずれか１つの手段により前記ピン大向に固定されて
いることを特徴とする特許請求の範囲第１項に記載の球
レンズ保持装置。 ６、　前記テーパ穴のテーバ角度は少なくとも２６°以
上に設定されていることを特徴とする特許請求の範囲第
１項に記載の球レンズ保持装置。 ７、前記金属ホルダは鉄、ニッケル及びコバルトの合金
からなることを特徴とする特許請求の範囲第１項に記載
の球レンズ保持装置。 ８、前記ビンは鉄−ニソケルーコバルトの合金からなる
ことを特徴とする特ｉ！ｆ請求の範囲第１項に記載の球
レンズ保持装置。[Scope of Claims] 1. Tapered holes for holding a ball lens are provided in the center of a metal holder having both end surfaces and an outer surface extending between the two end surfaces, opening at both end surfaces of the metal holder. , the inner diameter of the first opening of the tapered hole is smaller than the diameter of the spherical lens, and the inner diameter of the second opening of the tapered hole is larger than the diameter of the spherical lens; ,
A plurality of pin holes are provided with one end opening on the outer surface of the metal holder and the other end opening on the inner surface of the tapered hole, and the tip of the pin fixed toward each pin is brought into contact with the inner surface of the tapered hole. A ball lens holding device that fixes and holds a ball lens in a tapered hole by making it contact with the surface of the ball lens at a position that is shifted toward the second opening side with respect to the center of the ball lens that is brought into contact with the ball lens. 2. The invention is characterized in that the inner surface of the pin hole and the outer peripheral surface of the pin are provided with screws that connect to each other, and the pin is fixed in a screwed state to the pin hole. The ball lens holding device according to scope 1. 3. The ball lens holding device according to claim 1, wherein the four pin holes are provided radially with respect to the axis of the tapered hole. 4. The ball lens holding device according to claim 1, wherein the tip of the pin that is brought into contact with the surface of the ball lens is formed in a hemispherical shape. 5. The ball lens holder according to claim 1, wherein the pin is fixed to the pin by any one of laser welding, soldering, or adhesive. Device. 6. The ball lens holding device according to claim 1, wherein the taper angle of the tapered hole is set to at least 26 degrees or more. 7. The ball lens holding device according to claim 1, wherein the metal holder is made of an alloy of iron, nickel, and cobalt. 8. A special feature in which the bottle is made of an alloy of iron-cobalt! f. A ball lens holding device according to claim 1.
JP10738884A 1984-05-29 1984-05-29 Spherical lens holding device Pending JPS60252311A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10738884A JPS60252311A (en) 1984-05-29 1984-05-29 Spherical lens holding device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10738884A JPS60252311A (en) 1984-05-29 1984-05-29 Spherical lens holding device

Publications (1)

Publication Number Publication Date
JPS60252311A true JPS60252311A (en) 1985-12-13

Family

ID=14457863

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10738884A Pending JPS60252311A (en) 1984-05-29 1984-05-29 Spherical lens holding device

Country Status (1)

Country Link
JP (1) JPS60252311A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5638472A (en) * 1993-04-01 1997-06-10 Optics For Research Optical fiber and lens assembly having a movable lens and a fixed optical fiber
JP2005202020A (en) * 2004-01-14 2005-07-28 Matsushita Electric Ind Co Ltd Lens unit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5638472A (en) * 1993-04-01 1997-06-10 Optics For Research Optical fiber and lens assembly having a movable lens and a fixed optical fiber
JP2005202020A (en) * 2004-01-14 2005-07-28 Matsushita Electric Ind Co Ltd Lens unit

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