JPS5810704A - Image guide having opaque film in end face and forming method for said opaque film - Google Patents

Image guide having opaque film in end face and forming method for said opaque film

Info

Publication number
JPS5810704A
JPS5810704A JP56108430A JP10843081A JPS5810704A JP S5810704 A JPS5810704 A JP S5810704A JP 56108430 A JP56108430 A JP 56108430A JP 10843081 A JP10843081 A JP 10843081A JP S5810704 A JPS5810704 A JP S5810704A
Authority
JP
Japan
Prior art keywords
opaque film
image
image guide
light
clad
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
JP56108430A
Other languages
Japanese (ja)
Inventor
Susumu Kashiwa
柏　享
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.)
Furukawa Electric Co Ltd
Original Assignee
Furukawa Electric 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 Furukawa Electric Co Ltd filed Critical Furukawa Electric Co Ltd
Priority to JP56108430A priority Critical patent/JPS5810704A/en
Publication of JPS5810704A publication Critical patent/JPS5810704A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
    • G02B23/26—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes using light guides

Landscapes

  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)

Abstract

PURPOSE:To improve the picture quality of an image transmitted through an image guide, by applying a photosensitive material to the end face of the image guide in the longitudinal direction and exposing this material to the light transmitted through the image guide and developing and fixing this photosensitive material. CONSTITUTION:A center part 10 of an image guide 3 in the longitudinal direction is curved, and this part is soaked in a transparent liquid 11 having a refractive index approximately equal to that of clad materials, and the light is projected to a clad 1 of the image guide 3 from a light source 12 provided in the transparent liquid 11. THe projected light is transmitted as a clad mode light to both end faces 6 and 9 of the clad to expose photosensitive materials in the part to which the light is irradiated. They are developed are fixed to form opaque films 7 on both end faces 6 and 9 of the clad. In the image clad obtained in this manner, the light transmitted through the clad is intercepted, and only the light transmitted through the core is emitted, and thus, the quality of image transmission is improved considerably.

Description

【発明の詳細な説明】 本発明はイメージガイドにより伝送されるイメージの画
質を向上させるため、クラッドの端面に不透明膜を形成
してクラッドモード光を除去するようにしたイメージフ
ァイバと、その不透明膜の形成方法に関する。DETAILED DESCRIPTION OF THE INVENTION In order to improve the quality of images transmitted by an image guide, the present invention provides an image fiber in which an opaque film is formed on the end face of the cladding to remove cladding mode light, and the opaque film. The present invention relates to a method of forming.

イノ４ジガイドはコアとクラッドとからなる光伝送路を
多数整列させ、各光伝送路を各画素に対応させてイメー
ジの直接伝送を行なうものである。The Ino4Gide is a device in which a large number of optical transmission paths each consisting of a core and a cladding are aligned, and each optical transmission path corresponds to each pixel to directly transmit an image.

この場合イメージ伝送に必要なのはコアにより伝送され
る光だけであるが、一般にクラッドは光透過率がコアの
材料と略同じである材料により形成されているためクラ
ッドによってもかなシの光が伝送される。そのため第１
図のクラッド（１）に入射された光はコア（２）内を通
過しながらあたかもイメージファイバ（３）全体が１つ
のコアであるかのように伝送される。（この場合のクラ
ッドは空気あるいは被覆材）。しかもイメージファイバ
（３）の両端面（４）（５）はクラッド（１）もコア（
２）も同じ状態で露出しであるためクラッドｍｋ伝送さ
れた光（クラッドモード光〕はイメージファイバ全体の
クラッドモード光を平均化したものとなムこれがコア（
２）にょ９伝送されたイメージに重なる。このためイメ
ージのコントラストが低下し、イメージ全体が不鮮明に
なって画質が低下するという難点がある。特に石英系イ
メージファイバではクラッドの光透過率が良く、クラッ
ド断面積も大きいため前記難点が著しくこれがイメージ
ファイバを実用化する上で大きな障害となっている〇 本発明はこのような難点を解消したもので、以下これを
第２図、第３図に基づき詳記する。In this case, all that is needed for image transmission is the light transmitted by the core, but since the cladding is generally made of a material whose light transmittance is approximately the same as that of the core material, a small amount of light is transmitted by the cladding. Ru. Therefore, the first
Light incident on the cladding (1) in the figure is transmitted as if the entire image fiber (3) were one core while passing through the core (2). (The cladding in this case is air or coating material). Moreover, both end faces (4) and (5) of the image fiber (3) are covered with both the cladding (1) and the core (
Since 2) is also exposed in the same state, the light (cladding mode light) transmitted through the clad mk is the average of the cladding mode light of the entire image fiber.This is the core (
2) It overlaps with the transmitted image. As a result, the contrast of the image decreases, making the entire image unclear and reducing the image quality. In particular, in the case of silica-based image fibers, the light transmittance of the cladding is good and the cross-sectional area of the cladding is large, so the above-mentioned difficulties are conspicuous and this is a major obstacle to the practical application of image fibers.The present invention has solved these difficulties. This will be described in detail below based on FIGS. 2 and 3.

特許請求の範囲第１項に記載の発明は、イメージガイド
（３）の長手方向両端又は一端のクラッド端面（６）に
不透明膜（力を形成したものである。In the invention described in claim 1, an opaque film (force) is formed on the clad end surface (6) at both ends or one end in the longitudinal direction of the image guide (3).

特許請求の範囲第２項に記載の発明は前記不透明膜（力
の形成方法に関するもので、イメージガイド（３）の長
手方向両端面（４）（５）又はそのいずれか一端面に写
真フィルムに使用されているような感光物質を塗布し、
イメージファイバ（３）の一端（４）からクラッド（１
）にクラッドモー子犬（クラッドを伝送する光）を入れ
、この光により感光物質を露光し、それを現像、定着し
てイメージガイド（３）のクラッド端面（６）に不透明
膜（力を形成するようにしたものである〇 クラッドにのみクラッドモード光を入れる方法は次のよ
うにする。The invention set forth in claim 2 relates to a method for forming the opaque film (force), and includes a photographic film on both longitudinal end surfaces (4) and (5) of the image guide (3), or on one of the longitudinal end surfaces (4) and (5). Apply a photosensitive substance like the one used,
From one end (4) of the image fiber (3) to the cladding (1
), a cladding light beam (light transmitted through the cladding) is inserted into the cladding, the photosensitive material is exposed to this light, it is developed and fixed, and an opaque film (to form a force) is placed on the cladding end surface (6) of the image guide (3). 〇The method to enter cladding mode light only into the cladding is as follows.

一般にコア（２）とクラッド（１）との屈折率比は、被
覆材としてのシリコン樹脂あるいは空気とクラッド（１
）との屈折率比よシも小さいため、コア（２）の開口角
ＮＡ、はクラッドモード伝送の開ロ角ＮＡ弘シ小さい。Generally, the refractive index ratio between the core (2) and the cladding (1) is the same as that between the silicone resin as the covering material or the air and the cladding (1).
), the aperture angle NA of the core (2) is smaller than the aperture angle NA of the cladding mode transmission.

従ってＮＡ、よシ大きくＮＡ、よシ小さい開口角内の入
射光をイメージファイバ（３）の一端面（４）に投射す
ればよい。Therefore, it is sufficient to project incident light within an aperture angle with a larger NA and a smaller aperture onto one end surface (4) of the image fiber (3).

他の露光手段としてはコア（２）にコアモード光（コア
を伝送する光）のみを入゛九てコア端面の感光物質を露
光し、これを反転現像して露光された部分だけを透明に
し、クラッド端面（６）に不透明膜（７）が形成される
ようにしてもよい。Another exposure method involves injecting only core mode light (light transmitted through the core) into the core (2), exposing the photosensitive material on the end face of the core, and reversing this to make only the exposed portion transparent. , an opaque film (7) may be formed on the cladding end face (6).

コアの開口角ＮＡ、が非常に大きくクラッドモード伝送
を行なうのが困難な場合は、イメージファイバ（３）の
一端面（４）からコア（２）にのみコアモード光を入れ
てコア（２）の他端面（８）の感光物質を露光し、これ
を現像、定着して一旦コア端面（８）に不透明膜を形成
する。次に不透明膜が形成された側のクラッド端面から
クラッド（１）にクラッドモード光を入れて反対側のク
ラッド端面（９）の感光物質を露光させ、これを現像、
定着させてクラッド端面（９）に不透明膜を作る。次に
先に形成したコア端面（８）の不透明膜を除去して後か
ら。If the aperture angle NA of the core is very large and it is difficult to perform cladding mode transmission, enter the core mode light only from one end surface (4) of the image fiber (3) to the core (2). The photosensitive material on the other end surface (8) is exposed, developed and fixed to once form an opaque film on the core end surface (8). Next, cladding mode light is introduced into the cladding (1) from the cladding end face on the side where the opaque film is formed to expose the photosensitive material on the opposite cladding end face (9), and this is developed.
It is fixed to form an opaque film on the clad end face (9). Next, remove the opaque film on the core end face (8) that was formed earlier.

形成した不透明膜だけを残してもよい。Only the formed opaque film may be left.

第３図に示すものはイメージガイド（３）の長手方向両
端（４）（５）のクラッド端面（６１（９）に不透明膜
（力を形成する方法の一例を示すもので、イメージガイ
ド（３）の７長手方向中央部（１０）’ｅ湾曲させ、そ
の部分をクラッド材料の屈折率と略同じ屈折率の透明液
θυ内に入れ、この透明液０υ内に設けた光源αのから
イメージガイド（３）のクラッド（１）に光を投射する
ようにしたものである。投射された光はクラッドモード
光となってクラッド両端面（６）（９）に伝送されてそ
の部分の感光物質を露光する。これを現像、定着させて
両クラッド端面（６Ｈ９）に不透明膜を作る。The one shown in Fig. 3 shows an example of a method of forming an opaque film (force) on the clad end faces (61 (9)) at both longitudinal ends (4) and (5) of the image guide (3). ) is curved in the longitudinal direction center part (10)'e, and that part is placed in a transparent liquid θυ with a refractive index that is approximately the same as the refractive index of the cladding material. (3) Light is projected onto the cladding (1).The projected light becomes cladding mode light and is transmitted to both end faces (6) and (9) of the cladding, thereby damaging the photosensitive material in that area. Expose, develop and fix this to form an opaque film on both clad end faces (6H9).

叙上のように特許請求の範囲第１項記載の発明はイメー
ジガイド（３）のクラッド端面（６）（９）の両方又は
一方に不透明膜（力を形成してなるためクラッドによシ
伝送される光は遮断されてコアで伝送される光だけが出
射するためイメージ伝送の画質が大幅に改善される。As mentioned above, the invention described in claim 1 is formed by forming an opaque film (force) on both or one of the cladding end faces (6) and (9) of the image guide (3), so that the force is transmitted to the cladding. Since the transmitted light is blocked and only the light transmitted by the core is emitted, the quality of image transmission is greatly improved.

特許請求の範囲第２項の発明はイメージガイドの端面に
感光物質を塗布し、それを露光、現像、定着してクラッ
ド端面（６１（９）に不透明膜（力を形成するものであ
るため手軽に不透明膜（力を形成することができ、しか
もイメージガイド自体には何ら変更を加える必要がない
ためイメージガイドの伝送特性を損なうようなこともな
い。The invention as claimed in claim 2 coats a photosensitive material on the end face of an image guide, exposes it, develops it, and fixes it to form an opaque film on the clad end face (61(9)). The opaque film (force) can be applied to the image guide without any changes being made to the image guide itself, without compromising the transmission properties of the image guide.

更には既製のイメージガイドに後処理することもできる
ため適用範囲が広くなシ実用価値が高まる。Furthermore, it is possible to perform post-processing on ready-made image guides, which increases the scope of application and increases the practical value.

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

第１図はイメージガイドによる光の伝送状態を示す説明
図、第２図は本発明に係るイメージガイドの光伝送状態
を示す説明図、第３図は本発明の一製造法を示す説明図
である。 （１）はクラッド、　（２）はコア、 （３）はイメージガイド、（４）（５）はイメージガイ
ドの端面、（６Ｈ９）はクラッド端面、（７）は不透明
膜、（８）はコア端面。FIG. 1 is an explanatory diagram showing the state of light transmission by the image guide, FIG. 2 is an explanatory diagram showing the state of light transmission by the image guide according to the present invention, and FIG. 3 is an explanatory diagram showing one manufacturing method of the present invention. be. (1) is cladding, (2) is core, (3) is image guide, (4) (5) is the end face of image guide, (6H9) is clad end face, (7) is opaque film, (8) is core End face.

Claims (5)

【特許請求の範囲】[Claims] （１）コアとクラッドとからなる光伝送路全多数整列さ
せてイメージの直接伝送を・行なうイメージガイドにお
いて、その長手方向両端又は一端のクラッド端面に不透
明膜を形成してなる端面に不透明膜１有するイメージガ
イド。(1) In an image guide that directly transmits an image by aligning all the optical transmission paths consisting of a core and a cladding, an opaque film is formed on the cladding end face at both or one end in the longitudinal direction, and an opaque film is formed on the end face. Image guide with. （２）イメージガイドの長手方向両端面または一端面に
感光物質を塗布し、この感光物質の一部をイメージガイ
ドで伝送した光により露光し、それを現像、定着してイ
メージガイドのクラッド端面に不透明膜を形成するよう
にしたイメージガイドの不透明膜形成方法。(2) Apply a photosensitive material to both longitudinal end surfaces or one end surface of the image guide, expose a portion of this photosensitive material to the light transmitted by the image guide, develop and fix it, and apply it to the clad end surface of the image guide. A method for forming an opaque film on an image guide. （３）感光物質の露光手段としてクラッドにのみクラッ
ドモード光を入れるようにした特許請求の範囲第２項記
載のイメージガイドの不透明膜形成方法。(3) A method for forming an opaque film in an image guide according to claim 2, wherein cladding mode light is introduced only into the cladding as a means for exposing the photosensitive material. （４）感光物質の露光手段としてコアにのみコアモード
光を入れ、現像を反転現像にしてなる特許請求の範囲第
２項記載のイメージガイドの不透明膜形成方法。(4) A method for forming an opaque film for an image guide according to claim 2, wherein core mode light is applied only to the core as an exposure means for the photosensitive material, and development is performed by reversal development. （５）クラッド端面に不透明膜を形成する手段として−
Ｈイメージファイバの長手方向一端のコア端面に不透明
膜を形成し、次にこの端面からクラッドにのみ光を入れ
てイメージファイバの他端のクラッド端面に不透明膜を
形成し、この後先に形成したコア端面の不透明膜を除去
するようにした特許請求の範囲第２項記載のイメージガ
イドの不透明膜形成方法。(5) As a means of forming an opaque film on the clad end face -
An opaque film is formed on the core end face at one longitudinal end of the H image fiber, and then light is allowed to enter the cladding only from this end face to form an opaque film on the clad end face at the other end of the image fiber. 3. The method of forming an opaque film in an image guide according to claim 2, wherein the opaque film on the end face of the core is removed.
JP56108430A 1981-07-11 1981-07-11 Image guide having opaque film in end face and forming method for said opaque film Pending JPS5810704A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56108430A JPS5810704A (en) 1981-07-11 1981-07-11 Image guide having opaque film in end face and forming method for said opaque film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56108430A JPS5810704A (en) 1981-07-11 1981-07-11 Image guide having opaque film in end face and forming method for said opaque film

Publications (1)

Publication Number Publication Date
JPS5810704A true JPS5810704A (en) 1983-01-21

Family

ID=14484568

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56108430A Pending JPS5810704A (en) 1981-07-11 1981-07-11 Image guide having opaque film in end face and forming method for said opaque film

Country Status (1)

Country Link
JP (1) JPS5810704A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012168094A (en) * 2011-02-16 2012-09-06 Fujifilm Corp Photoacoustic imaging device, and probe unit used in the same
JP2012168092A (en) * 2011-02-16 2012-09-06 Fujifilm Corp Photoacoustic imaging device, probe unit used in the same, and operation method of photoacoustic imaging device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012168094A (en) * 2011-02-16 2012-09-06 Fujifilm Corp Photoacoustic imaging device, and probe unit used in the same
JP2012168092A (en) * 2011-02-16 2012-09-06 Fujifilm Corp Photoacoustic imaging device, probe unit used in the same, and operation method of photoacoustic imaging device

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