JPH0560931A - Graded index plastic rein forming body - Google Patents
Graded index plastic rein forming bodyInfo
- Publication number
- JPH0560931A JPH0560931A JP3221608A JP22160891A JPH0560931A JP H0560931 A JPH0560931 A JP H0560931A JP 3221608 A JP3221608 A JP 3221608A JP 22160891 A JP22160891 A JP 22160891A JP H0560931 A JPH0560931 A JP H0560931A
- Authority
- JP
- Japan
- Prior art keywords
- rod
- refractive index
- pmma
- solution
- pvdf
- 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
Links
Landscapes
- Light Guides In General And Applications Therefor (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は屈折率分布型プラスチッ
ク樹脂成形体に係り、特に複写機、ファクシミリ、LE
Dプリンターなどに使用される等倍型の読み取りレンズ
に応用されるそうした樹脂成形体に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gradient index plastic resin molding, and more particularly to a copying machine, a facsimile, and an LE.
The present invention relates to such a resin molded product applied to a reading lens of the same size used for a D printer or the like.
【0002】[0002]
【従来の技術】近年、OA機器の分野では複写機、ファ
クシミリ、LEDプリンターなどでは、家庭への浸透に
よる持ち運びの便利さ、組立やメンテナンスの簡単さな
どの要求から小型化、低コスト化の流れに対応した、ア
レイ型の等倍型結像素子の需要が拡大しつつある。2. Description of the Related Art In recent years, in the field of office automation equipment, copying machines, facsimiles, LED printers, etc., are becoming smaller and less costly due to the demands of easy transportation and easy assembly and maintenance due to penetration into the home. There is an increasing demand for an array-type unit-size imaging element that is compatible with the above.
【0003】従来の屈折率分布型光ファイバの導光原理
を図6に示した。屈折率分布型光ファイバは中心部で屈
折率が最も大きく、周辺部ほど小さくなる放物線状の屈
折分布を持つ。光は屈折率の高い方に曲がる性質を持っ
ているので、このようなファイバに入射光線は同じ周期
の正弦曲線を描いて進むことになる。この原理を利用し
て、光ファイバをアレイ化したレンズの長さ、物体面と
の距離を調整して正立等倍像を作ることができる。The guiding principle of a conventional gradient index optical fiber is shown in FIG. The gradient index optical fiber has a parabolic refractive index distribution in which the refractive index is largest in the central portion and smaller in the peripheral portion. Since light has a property of bending toward the higher refractive index, an incident light ray in such a fiber travels in a sinusoidal curve having the same period. By utilizing this principle, it is possible to create an erecting equal-magnification image by adjusting the length of a lens in which optical fibers are arrayed and the distance to the object plane.
【0004】従来の屈折率分布ガラスレンズは珪素や鉛
などを主成分とするガラスロッドに屈折率を大きくする
元素(タリウム)を加えて置き、その後屈折率を小さく
する元素(カリウム)を加えた溶融液に浸漬し、イオン
交換法によって、周辺部ほど後者の割合を高くする。こ
うして、放物線状の屈折率分布を持つガラスロッドを形
成する。その後、これをファイバ状に細線化することに
より、屈折率分布型光ファイバを得る。さらに、この光
ファイバをアレイ化することにより読み取り用のレンズ
アレイが得られる。In the conventional gradient index glass lens, a glass rod containing silicon, lead or the like as a main component is placed with an element (thalium) for increasing the refractive index, and then an element (potassium) for reducing the refractive index is added. Immersion in the melt, and the latter is increased in proportion to the peripheral portion by the ion exchange method. In this way, a glass rod having a parabolic refractive index distribution is formed. After that, this is thinned into a fiber shape to obtain a gradient index optical fiber. Further, a lens array for reading can be obtained by arraying this optical fiber.
【0005】[0005]
【発明が解決しようとする課題】従来の屈折率分布型フ
ァイバアレイはガラスで製造されているため、折れ易
く、またアレイ化した時、レンズとして使用するために
は端面を研磨する必要があり、低コスト化する上で限界
があった。そこで、本発明は、屈折率分布型ファイバと
して、プラスチック材料を用い、可とう性が良く、かつ
端面研磨が容易な光ファイバを提供することを目的とす
るものである。Since the conventional gradient index fiber array is made of glass, it easily breaks, and when it is formed into an array, it is necessary to polish the end face for use as a lens. There was a limit in reducing the cost. Therefore, an object of the present invention is to provide an optical fiber that uses a plastic material as the gradient index fiber, has good flexibility, and is easy to polish the end face.
【0006】[0006]
【課題を解決するための手段】本発明は、上記目的を達
成するために、円形の横断面内において中心部がポリア
クリル酸アルキルを主成分とする高分子で構成され、そ
の外側円周方向に中心からずれるに従ってフッ素樹脂の
濃度が増加して、屈折率が外周方向に減少する分布を有
することを特徴とする屈折率分布型プラスチック樹脂成
形体、及びこの成形体をアレイ化して成る像読み取りレ
ンズを提供する。In order to achieve the above-mentioned object, the present invention comprises a polymer whose main portion is a polyalkyl acrylate as a main component in a circular cross section, and which has an outer circumferential direction. The concentration distribution of the fluororesin increases with the deviation from the center, and the refractive index has a distribution that decreases in the outer peripheral direction, and a gradient index plastic resin molded body, and an image reading formed by arraying this molded body Provide a lens.
【0007】[0007]
【作用】ポリフッ化ビニリデン(以下PVDF)とポリ
メチルメタクリレート(以下PMMA)を均一にブレン
ドすると、図1の如くその重量分率に比例して、PVD
Fの増加とともに屈折率が減少する。一方、ブレンド品
(厚さ:3mm)の透過率は図2に示すように、PVDF
のブレンド比率が80%程度までは光学的に透明である
ことがわかる。これらの性質を利用し、すなわちプラス
チックロッドの中心部がPMMAの重量が多く、かつ外
周に行くほどPVDFの重量分率を増やすように形成す
れば屈折率分布型のプラスチックのロッドが得られる。[Function] When polyvinylidene fluoride (hereinafter referred to as PVDF) and polymethylmethacrylate (hereinafter referred to as PMMA) are uniformly blended, PVD is proportional to the weight fraction as shown in FIG.
The refractive index decreases as F increases. On the other hand, the transmittance of the blended product (thickness: 3 mm) is PVDF as shown in FIG.
It can be seen that up to a blend ratio of about 80% is optically transparent. By utilizing these properties, that is, by forming the plastic rod so that the center portion of the plastic rod has a large weight of PMMA and the PVDF weight fraction increases toward the outer periphery, a gradient index plastic rod can be obtained.
【0008】[0008]
【実施例】図3は本発明の屈折率分布型プラスチックロ
ッドの製造方法の原理についての説明図である。まず透
明なPMMAのロッド1をPMMAとPVDFを1対n
1 の重量比率で溶かした溶液(例えば、溶媒としてはジ
オキサン)2に浸漬し、PMMAのロッドの外周にこの
比率のブレンド品3を所定の厚さ堆積させる、つぎにこ
の溶媒から引き上げたあと十分乾燥させた後、前記溶液
よりPVDFの濃度の高い溶液4中に再度浸漬し、前記
ロッドより低屈折率のブレンド5を堆積させる。このよ
うな工程を順次繰替えし、堆積させて行くことにより屈
折率分布を持たせたロッドが形成できる。EXAMPLE FIG. 3 is an explanatory view of the principle of the method of manufacturing a gradient index plastic rod of the present invention. First, attach the transparent PMMA rod 1 to PMMA and PVDF 1 to n.
Immerse in a solution (eg, dioxane as a solvent) dissolved in a weight ratio of 1 and deposit the blended product 3 of this ratio on the outer circumference of the PMMA rod to a predetermined thickness. After being dried, it is immersed again in the solution 4 having a higher concentration of PVDF than the solution, and the blend 5 having a lower refractive index than the rod is deposited. A rod having a refractive index distribution can be formed by sequentially repeating such steps and depositing them.
【0009】図4は本発明の他の実施例でPMMAのロ
ッド11をPVDFをわずかに混入するPMMAの混合
溶液12に浸漬した後、PVDFを同一溶媒もしくは他
の溶媒に溶かした溶液13を徐々に添加して行き、ロッ
ドの外周にPVDFの濃度が大きくなるように堆積さ
せ、屈折率分布を持つようにしたものである。本方法に
おいて、PMMAの貧溶媒を徐々に加えて行き、PMM
Aが最初は選択的にロッドに付着させ、溶液のPMMA
の濃度が徐々に低下して行き実質的に外周に行く程、P
VDFの濃度を大きくする方法もある。FIG. 4 shows another embodiment of the present invention in which the PMMA rod 11 is dipped in a PMMA mixed solution 12 containing a slight amount of PVDF, and then a solution 13 of PVDF in the same solvent or another solvent is gradually added. Is added to the outer circumference of the rod so as to increase the PVDF concentration so that it has a refractive index distribution. In this method, the poor solvent of PMMA is gradually added to the PMM.
A is initially selectively attached to the rod and the PMMA of the solution
As the concentration of P gradually decreases and goes to the outer circumference, P
There is also a method of increasing the concentration of VDF.
【0010】このような方法で、例えば、コア径0.5
mmφ、ロッド径5mmφ、中心部の屈折率1.49、外周
部の屈折率1.41のプラスチックロッドを製造するこ
とができる。また、光ファイバを製造するためには、ロ
ッドの外周に円筒状ヒーターを配置し、ロッドが溶融す
る200℃付近までに加熱する。一方、ロッドの先端部
を巻き取り機に光ファイバに紡糸し、屈折率分布型ファ
イバを作製する。In such a method, for example, a core diameter of 0.5
It is possible to manufacture a plastic rod having a mmφ, a rod diameter of 5 mmφ, a central refractive index of 1.49, and an outer peripheral refractive index of 1.41. Further, in order to manufacture an optical fiber, a cylindrical heater is arranged on the outer circumference of the rod and heating is performed up to around 200 ° C. at which the rod melts. On the other hand, the tip of the rod is spun into an optical fiber by a winding machine to produce a gradient index fiber.
【0011】こうして作製された光ファイバは、例え
ば、外径1.0φ、コア径0.1mmφ、屈折率は中心部
で1.49、外周で1.41の放射線型分布である。こ
のような光ファイバの構成は常法に従うことができる。
図5に像読み取りレンズアレイを示す。上記の如くして
製造した屈折率分布型プラスチックロッド又は光ファイ
バ21を迷光を防ぐため黒色の樹脂カバー(モールド)
22で被って製造する。The optical fiber thus produced has a radiation type distribution of, for example, an outer diameter of 1.0φ, a core diameter of 0.1 mmφ, a refractive index of 1.49 at the central portion and 1.41 at the outer periphery. The structure of such an optical fiber can follow a conventional method.
FIG. 5 shows an image reading lens array. A black resin cover (mold) for preventing stray light from the gradient index plastic rod or optical fiber 21 manufactured as described above.
22 to manufacture.
【0012】図6は、図5のレンズアレイをファクシミ
リの結像レンズとして応用した様子を示し、光源31か
らの光で原稿32を照射し、反射光を像読み取りレンズ
アレイ33でCCDなどの受光センサー(ラインセンサ
ー)34上に結像させ、電気信号に変換する。FIG. 6 shows a state in which the lens array of FIG. 5 is applied as an image forming lens of a facsimile. A document 32 is irradiated with light from a light source 31, and reflected light is received by an image reading lens array 33 such as a CCD. An image is formed on the sensor (line sensor) 34 and converted into an electric signal.
【0013】[0013]
【発明の効果】本発明の屈折率分布型プラスチックロッ
ドはガラス製のものと比較し、可とう性があり、端面研
摩が容易であり、かつコア/クラッドの屈折率差が大き
くとれるため、薄型で屈折率分布のレンズが可能であ
る。また、ガラスよりも融点が低いため、ファイバ化も
容易でありかつ折れ難いためファイバのアレイ化が簡単
であり、、ファイバ型レンズアレイも容易に提供でき
る。The gradient index plastic rod of the present invention is thinner than the one made of glass because it has flexibility, the end surface is easily polished, and the difference in refractive index between the core and the clad is large. Therefore, a lens having a refractive index distribution is possible. Further, since it has a lower melting point than glass, it is easy to form a fiber and is difficult to break, so that an array of fibers is easy, and a fiber lens array can be easily provided.
【図面の簡単な説明】[Brief description of drawings]
【図1】PMMAとPVDFとのブレンド比率と屈折率
との関係図である。FIG. 1 is a relationship diagram of a blending ratio of PMMA and PVDF and a refractive index.
【図2】PMMAとPVDFとのブレンド比率と光透過
率との関係図である。FIG. 2 is a relationship diagram of a blend ratio of PMMA and PVDF and a light transmittance.
【図3】実施例のプラスチック樹脂成形体の製造方法の
説明図である。FIG. 3 is an explanatory diagram of a method for manufacturing a plastic resin molded body according to an example.
【図4】別の実施例のプラスチック樹脂成形体の製造方
法の説明図である。FIG. 4 is an explanatory view of a method for manufacturing a plastic resin molded body of another example.
【図5】アレイ化した光ファイバによる像読み取りレン
ズを示す図である。FIG. 5 is a diagram showing an image reading lens using an arrayed optical fiber.
【図6】レンズアレイをファクシミリに応用した例を示
す図である。FIG. 6 is a diagram showing an example in which a lens array is applied to a facsimile.
【図7】光ファイバの原理説明図である。FIG. 7 is a diagram illustrating the principle of an optical fiber.
1…PMMAロッド 2,4…PMMA/PVDF混合溶液 3,5…PMMA/PVDFブレンド層 11…PMMAロッド 12…PMMA/PVDF混合溶液 13…PVDF溶液 21…光ファイバ 22…樹脂カバー 31…光源 32…原稿 33…レンズアレイ 34…ラインセンサー 1 ... PMMA rod 2, 4 ... PMMA / PVDF mixed solution 3, 5 ... PMMA / PVDF blend layer 11 ... PMMA rod 12 ... PMMA / PVDF mixed solution 13 ... PVDF solution 21 ... Optical fiber 22 ... Resin cover 31 ... Light source 32 ... Document 33 ... Lens array 34 ... Line sensor
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小島 雄次 神奈川県川崎市中原区上小田中1015番地 富士通株式会社内 (72)発明者 高橋 栄悦 神奈川県川崎市中原区上小田中1015番地 富士通株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Ojima 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited (72) Inventor, Eietsu Takahashi 1015, Kamiodanaka, Nakahara-ku, Kawasaki, Kanagawa Prefecture, Fujitsu Limited
Claims (4)
クリル酸アルキルを主成分とする高分子で構成され、そ
の外側円周方向に中心からずれるに従ってフッ素樹脂の
濃度が増加して、屈折率が外周方向に減少する分布を有
することを特徴とする屈折率分布型プラスチック樹脂成
形体。1. A circular cross-section has a central portion composed of a polymer having a polyalkyl acrylate as a main component, and the concentration of the fluororesin increases as it deviates from the center in the outer circumferential direction, and the refractive index increases. Has a distribution that decreases in the outer peripheral direction, a gradient index plastic resin molded product.
体。2. The molded product according to claim 1, which is an optical fiber.
ルメタクリレート、前記フッ素樹脂がポリフッ化ビニリ
デンである請求項1又は2に記載の成形体。3. The molded product according to claim 1, wherein the alkyl polyacrylate is polymethyl methacrylate, and the fluororesin is polyvinylidene fluoride.
成形体をアレイ状に並べて構成した像読み取りレンズ。4. An image reading lens formed by arranging the plastic resin moldings according to claim 1 or 2 in an array.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3221608A JPH0560931A (en) | 1991-09-02 | 1991-09-02 | Graded index plastic rein forming body |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3221608A JPH0560931A (en) | 1991-09-02 | 1991-09-02 | Graded index plastic rein forming body |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0560931A true JPH0560931A (en) | 1993-03-12 |
Family
ID=16769420
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3221608A Pending JPH0560931A (en) | 1991-09-02 | 1991-09-02 | Graded index plastic rein forming body |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0560931A (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09243836A (en) * | 1996-03-13 | 1997-09-19 | Asahi Chem Ind Co Ltd | Plastic optical fiber and plastic optical fiber cable formed by using this fiber |
US5938986A (en) * | 1997-03-17 | 1999-08-17 | Sumitomo Wiring Systems, Ltd. | Method and apparatus for manufacturing a graded refractive index plastic optical-fiber |
US6013205A (en) * | 1997-03-07 | 2000-01-11 | Sumitomo Wiring Systems, Ltd. | Method and apparatus for manufacturing distributed refractive index plastic optical-fiber |
US6054069A (en) * | 1997-10-14 | 2000-04-25 | Sumitomo Wiring Systems, Ltd. | Method of manufacturing a preform for a refractive index distributed type plastic optical fiber |
US6132650A (en) * | 1997-03-07 | 2000-10-17 | Sumitomo Wiring Systems, Ltd. | Method and apparatus for manufacturing distributed refractive index plastic optical-fiber |
US6610766B1 (en) | 1998-03-12 | 2003-08-26 | Kureha Kagaku Kogyo K.K. | Polyvinylidene fluoride resin composition |
US6787289B2 (en) | 2001-12-21 | 2004-09-07 | Jsr Corporation | Radiation sensitive refractive index changing composition and refractive index changing method |
US6828078B2 (en) | 2000-08-29 | 2004-12-07 | Jsr Corporation | Composition having refractive index sensitively changeable by radiation and method for forming refractive index pattern |
US7071255B2 (en) | 2001-02-19 | 2006-07-04 | Jsr Corporation | Radiation-sensitive composition capable of having refractive index distribution |
US7108954B2 (en) | 2000-12-11 | 2006-09-19 | Jsr Corporation | Radiation-sensitive composition changing in refractive index and method of changing refractive index |
US7125647B2 (en) | 2001-03-13 | 2006-10-24 | Jsr Corporation | Radiation-sensitive composition changing in refractive index and utilization thereof |
US7320854B2 (en) | 2003-06-25 | 2008-01-22 | Jsr Corporation | Radiation sensitive refractive index changing composition, pattern forming method and optical material |
JP2010524214A (en) * | 2007-04-05 | 2010-07-15 | コミッサリア ア レネルジー アトミーク エ オ ゼネルジ ザルタナテイヴ | Thin flat concentrator |
-
1991
- 1991-09-02 JP JP3221608A patent/JPH0560931A/en active Pending
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09243836A (en) * | 1996-03-13 | 1997-09-19 | Asahi Chem Ind Co Ltd | Plastic optical fiber and plastic optical fiber cable formed by using this fiber |
US6013205A (en) * | 1997-03-07 | 2000-01-11 | Sumitomo Wiring Systems, Ltd. | Method and apparatus for manufacturing distributed refractive index plastic optical-fiber |
US6132650A (en) * | 1997-03-07 | 2000-10-17 | Sumitomo Wiring Systems, Ltd. | Method and apparatus for manufacturing distributed refractive index plastic optical-fiber |
US5938986A (en) * | 1997-03-17 | 1999-08-17 | Sumitomo Wiring Systems, Ltd. | Method and apparatus for manufacturing a graded refractive index plastic optical-fiber |
US6054069A (en) * | 1997-10-14 | 2000-04-25 | Sumitomo Wiring Systems, Ltd. | Method of manufacturing a preform for a refractive index distributed type plastic optical fiber |
US6610766B1 (en) | 1998-03-12 | 2003-08-26 | Kureha Kagaku Kogyo K.K. | Polyvinylidene fluoride resin composition |
US6828078B2 (en) | 2000-08-29 | 2004-12-07 | Jsr Corporation | Composition having refractive index sensitively changeable by radiation and method for forming refractive index pattern |
US7108954B2 (en) | 2000-12-11 | 2006-09-19 | Jsr Corporation | Radiation-sensitive composition changing in refractive index and method of changing refractive index |
US7071255B2 (en) | 2001-02-19 | 2006-07-04 | Jsr Corporation | Radiation-sensitive composition capable of having refractive index distribution |
US7125647B2 (en) | 2001-03-13 | 2006-10-24 | Jsr Corporation | Radiation-sensitive composition changing in refractive index and utilization thereof |
US6787289B2 (en) | 2001-12-21 | 2004-09-07 | Jsr Corporation | Radiation sensitive refractive index changing composition and refractive index changing method |
US7320854B2 (en) | 2003-06-25 | 2008-01-22 | Jsr Corporation | Radiation sensitive refractive index changing composition, pattern forming method and optical material |
JP2010524214A (en) * | 2007-04-05 | 2010-07-15 | コミッサリア ア レネルジー アトミーク エ オ ゼネルジ ザルタナテイヴ | Thin flat concentrator |
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Legal Events
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