JP2007225320A - Optical diagnostic method and device by oct - Google Patents

Optical diagnostic method and device by oct Download PDF

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JP2007225320A
JP2007225320A JP2006044107A JP2006044107A JP2007225320A JP 2007225320 A JP2007225320 A JP 2007225320A JP 2006044107 A JP2006044107 A JP 2006044107A JP 2006044107 A JP2006044107 A JP 2006044107A JP 2007225320 A JP2007225320 A JP 2007225320A
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light
speed
optical
optical fiber
delay device
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Yukinori Mitsuhata
幸則 三畑
Shohei Kamaguchi
昌平 釜口
Kazunobu Ogawa
和伸 小川
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Morita Tokyo Manufacturing Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein a disc is difficult to be compactified, precise balance regulation is required for high speed rotation and an optical system is complicated, although the disc arranged with a plurality of right-angled prisms with an equal interval is rotated at a high speed as a high-speed optical delay device in a reference light side, so as to quicken depth-directional scanning, in the prior art, a problem wherein a data is not acquired in an instantaneous time when not irradiated with a reference light in a prism rotation switching time, a problem wherein an amount of signals returning from a specimen is reduced because an irradiation light is due to a sector system to require correction by a lens or the like for bringing the irradiation light in parallel, in a system of acquiring quickly the data by arranging a light scanner in a sample side, and a problem wherein the light scanner comes into a probe because of structure thereof, to weaken vibration and impact. <P>SOLUTION: An optical system is most simple and an amount of recursion signal light is great, and the continuous data is acquired, in a system of the present invention for reflecting a reference light by a high-speed light delay mechanism of reciprocating linearly a reference mirror at a high speed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、ＯＣＴ（Ｏｐｔｉｃａｌ Ｃｏｈｅｒｅｎｃｅ Ｔｏｍｏｇｒａｐｈｙ）に係り、特に高速直線状往復運動体を用いた高速光遅延装置による光診断方法及びその装置に関する。   The present invention relates to OCT (Optical Coherence Tomography), and more particularly to an optical diagnostic method and apparatus using a high-speed optical delay device using a high-speed linear reciprocating body.

従来、例えば眼科用等の製品の場合、データ取得を高速化するために、参照光側に高速光遅延装置として、複数個の直角プリズムを等間隔に配置した円板を置き、高速で回転させて、これにより深さ方向の走査を高速で行っている。
また、被検体サンプル側に配設された例えば、光スキャナにて、データ取得を高速化する方式がある。
特開２００２−３１０８９５号公報 特開２００２−３１０８９９号公報 特開２００２−１３９４２１号公報 Conventionally, for example, in the case of ophthalmic products, in order to speed up data acquisition, a disk with a plurality of right angle prisms arranged at equal intervals is placed on the reference light side as a high-speed optical delay device and rotated at high speed. Thus, scanning in the depth direction is performed at high speed.
In addition, there is a method of speeding up data acquisition by, for example, an optical scanner disposed on the subject sample side.
JP 2002-310895 A JP 2002-310899 A JP 2002-139421 A

しかしながら、前記回転方式における円板は小型化することは困難でかつ、高速回転させるためには精密なバランス調整等高度な技術が必要でありまた、光学系も複雑である。さらに、円板の回転により参照光があたるプリズムは、一つのプリズムから次のプリズムへと切り替わってゆく時参照光がプリズムに当らない瞬間ができ、この間はデータが取得できない。   However, it is difficult to reduce the size of the disk in the rotation system, and advanced techniques such as precise balance adjustment are required for high-speed rotation, and the optical system is complicated. Furthermore, the prism that receives the reference light by the rotation of the disk has a moment when the reference light does not hit the prism when switching from one prism to the next, and data cannot be acquired during this time.

また、前記被検体サンプル側に配設された例えば、光スキャナにてデータ取得を高速化する方式では、照射光が扇型に斜めに照射されるセクター方式であるため、被検体から戻る信号光の量が少なくなる欠点があり、そして照射光を平行に照射するためには、レンズ等による補正が必要であった。
さらに、構造上プローブ内に光スキャナが入るため、プローブが振動や衝撃に弱くなり、そして、前記光スキャナ自体も高価であった。 In addition, in the method of speeding up the data acquisition by, for example, an optical scanner arranged on the object sample side, the signal light returning from the object is a sector method in which irradiation light is obliquely irradiated in a fan shape. In order to irradiate the irradiation light in parallel, correction with a lens or the like is necessary.
Further, since the optical scanner enters the probe in the structure, the probe is weak against vibration and shock, and the optical scanner itself is expensive.

上記に鑑み本願発明者等は鋭意実験研究の結果、下記の手段によりこれらの問題を解決した。
（１）ＯＣＴ装置による光診断方法において、低コヒーレンス光源からの光を、２分割用光ファイバカプラで被検体への照射光と参照光とに分割し、前記参照光は参照鏡を高速で直線状に往復運動させる高速光遅延装置により反射鏡で反射回帰して、被検体から回帰する光と共に、前記２分割用光ファイバカプラで合成された干渉光を干渉光検出器で検出することを特徴とするＯＣＴ装置による光診断方法。
（２）高速光遅延装置が、高速で直線状に往復運動する高速リニヤアクチエータと、同高速リニヤアクチエータの往復運動体の前端に直線方向に光を反射するように配設された反射鏡と、さらにその前方に光ファイバに接続されたコリメートレンズを配設してなることを特徴とする前項（１）に記載のＯＣＴ装置による光診断方法。
（３）低コヒーレンス光源と、同低コヒーレンス光源からの光を被検体への照射光と参照光とに分割する２分割用光ファイバカプラと、前記参照光を高速で直線状の往復運動により遅延させる高速光遅延装置と、前記被検体から回帰する光と前記高速光遅延装置から回帰する参照光とを合波する前記２分割用光ファイバカプラと、同２分割用光ファイバカプラで合波された干渉光を検出する干渉光検出器とを備えてなることを特徴とするＯＣＴ装置。
（４）前記高速光遅延装置が、高速で直線状に往復運動する高速リニヤアクチエータと、同高速リニヤアクチエータの往復運動体の前端に直線方向に光を反射するように配設された反射鏡と、さらにその前方に光ファイバに接続されたコリメートレンズを配設してなることを特徴とする前項（３）に記載のＯＣＴ装置。 In view of the above, the inventors of the present invention have solved these problems by the following means as a result of intensive experimental research.
(1) In an optical diagnostic method using an OCT apparatus, light from a low-coherence light source is divided into irradiation light to a subject and reference light by a two-split optical fiber coupler, and the reference light linearly moves the reference mirror at high speed. A high-speed optical delay device that reciprocates in the shape of a beam and reflected by a reflecting mirror, and the interference light synthesized by the optical fiber coupler for bisection is detected by an interference light detector together with the light returning from the subject. An optical diagnostic method using an OCT apparatus.
(2) A high-speed optical delay device having a high-speed linear actuator that reciprocates linearly at high speed, and a reflecting mirror that is disposed so as to reflect light in a linear direction at the front end of the reciprocating body of the high-speed linear actuator. Further, a collimating lens connected to an optical fiber is disposed in front of the optical diagnostic method using the OCT apparatus according to (1) above.
(3) A low-coherence light source, a two-divided optical fiber coupler that divides light from the low-coherence light source into irradiation light to the subject and reference light, and delays the reference light by a linear reciprocating motion at high speed The optical fiber coupler for splitting, the optical fiber coupler for splitting 2 that combines the light returning from the subject and the reference light returning from the high-speed optical delay device, and the optical fiber coupler for splitting in two An OCT apparatus comprising an interference light detector for detecting the interference light.
(4) The high-speed optical delay device is a high-speed linear actuator that reciprocates linearly at high speed, and a reflection that is arranged to reflect light in a linear direction at the front end of the reciprocating body of the high-speed linear actuator. The OCT apparatus according to item (3) above, wherein a mirror and a collimating lens connected to an optical fiber are further disposed in front of the mirror.

本発明によれば次のような優れた効果を発揮する。
参照光は、参照鏡を高速で直線状上に往復運動させる高速光遅延機構によって反射させるため、簡単な構造の高速光遅延装置を形成することができる。
また、本方式では、参照鏡が直線状に高速で往復するため、光学系は最も単純である。
かつ、前記従来技術の回転円板方式と異なり、常に参照光が反射鏡にあたっているため、参照鏡の動作としては好適である。
従って、本発明に係る高速光遅延装置を採用することにより、製作が容易でかつ、性能の優れたＯＣＴ装置を提供することができる。
また、被検体サンプル側に配設された前記光スキャナによって、データ取得を高速化する照射光を扇型に斜めに照射するセクタ方式と異なり、直線方向に照射するリニア方式のため、被検体から戻る信号光の量が多く、また走査の中心位置に影響されない。
前記高速光遅延装置に、高速で直線状に往復運動する高速リニヤアクチエータを採用したため、小型で、振動、騒音の発生の少ない、例えば医療用に最適なＯＣＴ装置を作製することができる。 According to the present invention, the following excellent effects are exhibited.
Since the reference light is reflected by a high-speed optical delay mechanism that reciprocates the reference mirror linearly at high speed, a high-speed optical delay device having a simple structure can be formed.
Further, in this method, the optical system is the simplest because the reference mirror reciprocates linearly at high speed.
In addition, unlike the conventional rotating disk method of the prior art, since the reference light always strikes the reflecting mirror, it is suitable for the operation of the reference mirror.
Therefore, by employing the high-speed optical delay device according to the present invention, it is possible to provide an OCT device that is easy to manufacture and has excellent performance.
In addition, unlike the sector method in which irradiation light that accelerates data acquisition is obliquely irradiated in a fan shape by the optical scanner disposed on the object sample side, the linear method irradiates in a linear direction, so The amount of signal light to return is large and is not affected by the center position of the scan.
Since a high-speed linear actuator that reciprocates linearly at high speed is adopted as the high-speed optical delay device, it is possible to manufacture an OCT apparatus that is small and generates less vibration and noise, for example, optimal for medical use.

発明を実施するための最良の形態を以下図面に基づいて説明する。
図１は、本発明の高速光遅延装置を配設したＯＣＴ装置の構成説明のブロック図で、
本事例は、歯科用光診断装置である。
図において、１は診断用プローブ、２は高速光遅延装置、３は固定ステージ、４は高速リニヤアクチエータ、５は反射鏡、６は参照光、７はコリメートレンズ、８は深さ方向走査、９はＳＬＤ、１０は光ファイバ、１１は光サーキュレータ、１２は光ファイバカップラ、１３は検出器、１４は信号線、１５は信号処理部、１６はコンピュータ、１７は表示部、１８は光断層画像、１９は横又は縦方向走査、２０は信号光、２１は歯部、２２は歯、２３は歯肉を示す。 The best mode for carrying out the invention will be described below with reference to the drawings.
FIG. 1 is a block diagram for explaining the configuration of an OCT apparatus provided with a high-speed optical delay device according to the present invention.
This example is a dental optical diagnostic apparatus.
In the figure, 1 is a diagnostic probe, 2 is a high-speed optical delay device, 3 is a fixed stage, 4 is a high-speed linear actuator, 5 is a reflecting mirror, 6 is a reference beam, 7 is a collimating lens, 8 is a depth direction scan, 9 is an SLD, 10 is an optical fiber, 11 is an optical circulator, 12 is an optical fiber coupler, 13 is a detector, 14 is a signal line, 15 is a signal processing unit, 16 is a computer, 17 is a display unit, and 18 is an optical tomographic image. , 19 is horizontal or vertical scanning, 20 is signal light, 21 is a tooth portion, 22 is a tooth, and 23 is gingiva.

本図は、低コヒーレンス光源のＳＬＤ９からの光は、光ファイバ１０から光サーキュレータ１１経由２分割用光ファイバカプラ１２で、被検体の歯部２１へ信号光２０と参照光６とに分割し、前記参照光６は、参照鏡である反射鏡５を高速で直線状に往復運動させる高速光遅延装置２によって反射鏡５で反射回帰して、被検体の歯部２１から回帰する光と共に、前記２分割用光ファイバカプラ１２で合成された干渉光を検出器１３で検出するようにしたＯＣＴ装置における高速直線状往復運動体による高速光遅延を発生させる方法を示し、また、   In this figure, the light from the SLD 9 of the low coherence light source is split into the signal light 20 and the reference light 6 from the optical fiber 10 to the tooth portion 21 of the subject by the optical fiber coupler 12 for splitting via the optical circulator 11. The reference light 6 is reflected and reflected by the reflecting mirror 5 by the high-speed optical delay device 2 that reciprocates the reflecting mirror 5 that is a reference mirror in a linear manner at a high speed, along with the light that returns from the tooth portion 21 of the subject. A method for generating a high-speed optical delay by a high-speed linear reciprocating body in an OCT apparatus in which interference light combined by the two-dividing optical fiber coupler 12 is detected by a detector 13 is shown.

本ブロック図の主要部分は、低コヒーレンス光源のＳＬＤ９と、同ＳＬＤ９からの光を被検体歯部２１への信号光２０と参照光６とに分割する２分割用光ファイバカプラ１２と、前記参照光６を高速で直線状の往復運動により遅延させる高速光遅延装置２と、前記被検体歯部２１から回帰する光と前記高速光遅延装置２から回帰する参照光６とを合波する前記２分割用光ファイバカプラと１２と、同２分割用光ファイバカプラ１２で合波された干渉光を検出する検出器１３（バランスレシーバ）を備えてなる。
また、周辺の、歯科診断用プローブ１は、深さ方向に対し垂直方向の走査（横又は縦の走査１９）を行い、信号光２０を歯部２１に照射及び回帰させる。
また、検出器１３からの信号は、信号処理部１５経由コンピュータ１６に入力され、表示器１７には光断層画像１８が表示されて、全体でＯＣＴ装置を形成する。 The main part of this block diagram is a low-coherence light source SLD 9, a two-division optical fiber coupler 12 that divides the light from the SLD 9 into a signal light 20 to the subject tooth 21 and a reference light 6, and the reference The high-speed optical delay device 2 that delays the light 6 by high-speed linear reciprocation, and the light 2 that returns from the subject tooth portion 21 and the reference light 6 that returns from the high-speed optical delay device 2 are combined. The optical fiber coupler for splitting 12 and the detector 13 (balance receiver) for detecting the interference light combined by the optical fiber coupler for splitting 12 are provided.
In addition, the peripheral dental diagnostic probe 1 performs scanning in the direction perpendicular to the depth direction (horizontal or vertical scanning 19), and irradiates and returns the signal light 20 to the tooth portion 21.
The signal from the detector 13 is input to the computer 16 via the signal processing unit 15, and the optical tomographic image 18 is displayed on the display unit 17 to form an OCT apparatus as a whole.

本ＯＣＴ装置における前記高速光遅延装置２について説明する。
図２は高速光遅延装置の縦断面図である。
図において、２５はベース、２６はステー、２７通線孔、２８は内側ヨーク、２９はブッシュ、３０は永久磁石、３１は巻線コイル、３２はコイルボビン、３３は外側ヨーク、３４はカラー、３５は前カバー、３６は後カバー、３７はコイル引き出し線、３８はコネクタ、３９は駆動信号線、４０は駆動回路、４１は往復運動方向、４２は隙間、４３はシャフトを示す。 The high-speed optical delay device 2 in the present OCT apparatus will be described.
FIG. 2 is a longitudinal sectional view of the high-speed optical delay device.
In the figure, 25 is a base, 26 is a stay, 27 is a through hole, 28 is an inner yoke, 29 is a bush, 30 is a permanent magnet, 31 is a winding coil, 32 is a coil bobbin, 33 is an outer yoke, 34 is a collar, 35 Is a front cover, 36 is a rear cover, 37 is a coil lead wire, 38 is a connector, 39 is a drive signal line, 40 is a drive circuit, 41 is a reciprocating direction, 42 is a gap, and 43 is a shaft.

高速光遅延装置２はベース２５とステー２６の上面に固定されている。
内部は断面図に示したように、高速リニヤアクチエータ４は、直線状に往復運動方向４１のように動くコイルボビン３２があり、同コイルボビン３２の内周面は、内側ヨーク２８とその外周に固定されたブッシュ２９とからなるボビンに、狭小な可動用の隙間４３を有して接している。
そして、内側のヨーク２８は外側のヨーク３３及び前カバー３５と後カバー３６で形成される外装容器の後カバー３６に固定されている。
前記コイルボビン３２の外周には巻線コイル３１が配設されており、同巻線コイル３１の外周には、前記外側ヨーク３３の内周に固着されたリング状の永久磁石３０が近接して設けられている。
また、前記高速理リニヤアクチエータ２４のコイルボビン３２の前面中央には反射鏡５が固着されており、その前方にはコリメートレンズ７が前カバー３５の中央に配置され、光ファイバ１０に接続されている。
さらに、前記巻線コイル３１のコイル引き出し線３７が、前カバー３５に設けられた通線孔２７から外部に引き出され、前記外装容器に配設されたコネクタ３８を経由して、駆動信号線３９により外部の駆動回路４０に接続されている。 The high-speed optical delay device 2 is fixed to the upper surfaces of the base 25 and the stay 26.
As shown in the sectional view of the inside, the high-speed linear actuator 4 has a coil bobbin 32 that moves linearly in the reciprocating direction 41, and the inner peripheral surface of the coil bobbin 32 is fixed to the inner yoke 28 and its outer periphery. It is in contact with a bobbin composed of the bush 29 having a narrow movable gap 43.
The inner yoke 28 is fixed to the outer yoke 33 and the rear cover 36 of the outer container formed by the front cover 35 and the rear cover 36.
A winding coil 31 is disposed on the outer periphery of the coil bobbin 32, and a ring-shaped permanent magnet 30 fixed to the inner periphery of the outer yoke 33 is provided in the vicinity of the outer periphery of the winding coil 31. It has been.
A reflecting mirror 5 is fixed to the center of the front surface of the coil bobbin 32 of the high-speed linear actuator 24, and a collimating lens 7 is disposed at the center of the front cover 35 in front of the reflecting mirror 5 and connected to the optical fiber 10. Yes.
Further, a coil lead wire 37 of the winding coil 31 is drawn out from a through hole 27 provided in the front cover 35 and is driven to a drive signal line 39 via a connector 38 provided in the outer container. To the external drive circuit 40.

上記の作用は、外部の駆動回路４０から巻線コイル３１に送出される正負の駆動信号（５０〜５００Ｈｚ）によって、前記その外周に近接して設けられた永久磁石３０との磁界の正逆方向の変化に伴い、前記コイルボビン３２は前後に移動し、同コイルボビン３２の前面中央に固着された反射鏡５も前後に直線的に移動する。
また、同反射鏡５の前面には、コリメートレンズ７が配置されており、その先には光ファイバ１０が設けられているので、
光ファイバ１０からの前記ＳＬＤ９の光は、コリメイトレンズ７を経由し前記前後に直線的に移動する反射鏡５にあたって反射され、前記深さ方向走査８用として、干渉光を発生させる参照光６が回帰される。
この参照光６は、高速で直線状に往復運動する高速リニヤアクチエ−タ４に固着された反射鏡５により反射されるため、簡単な構造の高速光遅延装置２を形成することができる。従って、光学系は最も単純であり、また、常に参照光６が反射鏡５にあたっているため、参照鏡の動作としては理想的である。 The above-described action is achieved by the positive and negative drive signals (50 to 500 Hz) sent from the external drive circuit 40 to the winding coil 31 in the forward and reverse direction of the magnetic field with the permanent magnet 30 provided close to the outer periphery. As the coil bobbin 32 changes, the coil bobbin 32 moves back and forth, and the reflecting mirror 5 fixed to the front center of the coil bobbin 32 also moves back and forth linearly.
Further, a collimating lens 7 is disposed on the front surface of the reflecting mirror 5, and an optical fiber 10 is provided at the tip thereof.
The light of the SLD 9 from the optical fiber 10 is reflected by the reflecting mirror 5 that linearly moves back and forth via the collimate lens 7, and the reference light 6 that generates interference light for the depth direction scan 8. Is regressed.
Since the reference light 6 is reflected by the reflecting mirror 5 fixed to the high-speed linear actuator 4 that reciprocates linearly at high speed, the high-speed optical delay device 2 having a simple structure can be formed. Therefore, the optical system is the simplest, and the reference light 6 always strikes the reflecting mirror 5, so that the operation of the reference mirror is ideal.

図２は他の高速光遅延装置の縦断面図である。
図において、４’は高速リニヤアクチエータ、４３はシャフトを示す。
高速光遅延装置２はベース２５とステー２６の上面に固定されている。
内部は断面図に示したように、本事例の高速リニヤアクチエータ４’は、直線状に往復運動方向３９のように動く肉厚円筒状の永久磁石３０があり、同永久磁石３０の内周面は、シャフト４３と狭小な可動用の隙間４２を有して接している。
そして、シャフト４３の両端は、外側のヨーク３３及び前カバー３５と後カバー３６で形成される外装容器の、前カバー３５と後カバー３６の中央に固定されている。
また、前記永久磁石３０の外周には、前記外側ヨーク３３の内周に固着されたリング状の巻線コイル３１が近接して設けられている。
また、前記永久磁石３０の前面には反射鏡５が固着されており、その前方にはコリメートレンズ７が前カバー３５に配置され、光ファイバ１０に接続されている。
さらに、前記巻線コイル３１のコイル引き出し線３７が、前カバー３５に設けられた通線孔２７から外部に引き出され、外部の駆動回路３８に接続されている。 FIG. 2 is a longitudinal sectional view of another high-speed optical delay device.
In the figure, 4 'is a high-speed linear actuator, and 43 is a shaft.
The high-speed optical delay device 2 is fixed to the upper surfaces of the base 25 and the stay 26.
As shown in the sectional view of the interior, the high-speed linear actuator 4 ′ in this example has a thick cylindrical permanent magnet 30 that moves linearly in the reciprocating direction 39. The surface is in contact with the shaft 43 with a narrow movable gap 42.
Both ends of the shaft 43 are fixed to the center of the front cover 35 and the rear cover 36 of the outer container formed by the outer yoke 33 and the front cover 35 and the rear cover 36.
In addition, a ring-shaped winding coil 31 fixed to the inner periphery of the outer yoke 33 is provided in the vicinity of the outer periphery of the permanent magnet 30.
The reflecting mirror 5 is fixed to the front surface of the permanent magnet 30, and the collimating lens 7 is disposed on the front cover 35 in front of the permanent mirror 30 and connected to the optical fiber 10.
Further, a coil lead wire 37 of the winding coil 31 is drawn out from a through hole 27 provided in the front cover 35 and connected to an external drive circuit 38.

上記の作用は、外部の駆動回路３８から巻線コイル３１に送出される正負の駆動信号（５０〜５００Ｈｚ）によって、前記その内周の近接して設けられた永久磁石３０との磁界の正逆方向の変化に伴い、前記永久磁石３０は前後に移動し、同永久磁石３０の前面に固着された反射鏡５も前後に直線的に移動する。
また、同反射鏡５の前面には、コリメートレンズ７が配置されており、その先には光ファイバ１０が設けられているので、光ファイバ１０からの前記ＳＬＤ９の光は、
コリメイトレンズ７を経由し前記前後に直線的に移動する反射鏡５にあたって反射され、
前記深さ方向走査８用として、干渉光を発生させる参照光６が回帰される。
この参照光６は、高速で直線状に往復運動する高速リニヤアクチエ−タ４’に固着された反射鏡５により反射されるため、簡単な構造の高速光遅延装置２を形成することができる。
従って、光学系は最も単純であり、また、常に参照光６が反射鏡５にあたっているため、参照鏡の動作としては好適である。 The above action is based on the positive and negative drive signals (50 to 500 Hz) sent from the external drive circuit 38 to the winding coil 31, and the positive and negative magnetic fields with the permanent magnet 30 provided in the vicinity of the inner circumference. As the direction changes, the permanent magnet 30 moves back and forth, and the reflecting mirror 5 fixed to the front surface of the permanent magnet 30 also moves back and forth linearly.
Further, a collimating lens 7 is disposed on the front surface of the reflecting mirror 5 and an optical fiber 10 is provided at the tip thereof. Therefore, the light of the SLD 9 from the optical fiber 10 is
Reflected by the reflecting mirror 5 that moves linearly back and forth via the collimate lens 7,
For the depth scanning 8, the reference light 6 that generates interference light is returned.
Since the reference light 6 is reflected by the reflecting mirror 5 fixed to the high-speed linear actuator 4 'that reciprocates linearly at high speed, the high-speed optical delay device 2 having a simple structure can be formed.
Therefore, the optical system is the simplest, and the reference light 6 always strikes the reflecting mirror 5 and is therefore suitable for the operation of the reference mirror.

本発明の高速光遅延装置を配設したＯＣＴ装置の構成説明のブロック図Block diagram for explaining the configuration of an OCT apparatus provided with the high-speed optical delay device of the present invention 高速光遅延装置の縦断面図Longitudinal section of high-speed optical delay device 他の高速光遅延装置の縦断面図Vertical section of another high-speed optical delay device

符号の説明Explanation of symbols

１：診断用プローブ
２：高速光遅延装置
３：固定ステージ
４、４’：高速リニヤアクチエータ
５：反射鏡
６：参照光
７：コリメートレンズ
８：深さ方向走査
９：ＳＬＤ
１０：光ファイバ
１１：光サーキュレータ
１２：光ファイバカップラ
１３：検出器
１４：信号線
１５：信号処理部
１６：コンピュータ
１７：表示部
１８：光断層画像
１９：横又は縦方向走査
２０：信号光
２１：歯部
２２：歯
２３：歯肉
２５：ベース
２６：ステー
２７：通線孔
２８：内側ヨーク
２９：ブッシュ
３０：永久磁石
３１：巻線コイル
３２：コイルボビン
３３：外側ヨーク
３４：カラー
３５：前カバー
３６：後カバー
３７：コイル引き出し線
３８：コネクタ
３９：駆動信号線
４０：駆動回路
４１：往復運動方向
４２：隙間
４３：シャフト
1: Diagnostic probe 2: High-speed optical delay device 3: Fixed stage 4, 4 ': High-speed linear actuator 5: Reflector 6: Reference light 7: Collimator lens 8: Depth scan 9: SLD
10: Optical fiber 11: Optical circulator 12: Optical fiber coupler 13: Detector 14: Signal line 15: Signal processing unit 16: Computer 17: Display unit 18: Optical tomographic image 19: Horizontal or vertical scanning 20: Signal light 21 : Tooth part 22: tooth 23: gum 25: base 26: stay 27: wire hole 28: inner yoke 29: bush 30: permanent magnet 31: winding coil 32: coil bobbin 33: outer yoke 34: collar 35: front cover 36: Rear cover 37: Coil lead wire 38: Connector 39: Drive signal line 40: Drive circuit 41: Reciprocating motion direction 42: Clearance 43: Shaft

Claims (4)

ＯＣＴ装置による光診断方法において、
低コヒーレンス光源からの光を、２分割用光ファイバカプラで被検体への照射光と参照光とに分割し、前記参照光は参照鏡を高速で直線状に往復運動させる高速光遅延装置により反射鏡で反射回帰して、被検体から回帰する光と共に、前記２分割用光ファイバカプラで合成された干渉光を干渉光検出器で検出することを特徴とするＯＣＴ装置による光診断方法。 In an optical diagnostic method using an OCT apparatus,
The light from the low-coherence light source is divided into the irradiation light to the subject and the reference light by a two-split optical fiber coupler, and the reference light is reflected by a high-speed optical delay device that reciprocates the reference mirror linearly at high speed. An optical diagnostic method using an OCT apparatus, wherein interference light synthesized by the optical fiber coupler for bisection is detected by an interference light detector together with light returning from a subject after reflection by a mirror. 高速光遅延装置が、高速で直線状に往復運動する高速リニヤアクチエータと、同高速リニヤアクチエータの往復運動体の前端に直線方向に光を反射するように配設された反射鏡と、さらにその前方に光ファイバに接続されたコリメートレンズを配設してなることを特徴とする請求項１記載のＯＣＴ装置による光診断方法。   A high-speed optical delay device, a high-speed linear actuator that reciprocates linearly at high speed, a reflecting mirror that is arranged to reflect light in a linear direction at the front end of the reciprocating body of the high-speed linear actuator, and 2. The optical diagnostic method using an OCT apparatus according to claim 1, wherein a collimating lens connected to an optical fiber is disposed in front of the optical fiber. 低コヒーレンス光源と、同低コヒーレンス光源からの光を被検体への照射光と参照光とに分割する２分割用光ファイバカプラと、前記参照光を高速で直線状の往復運動により遅延させる高速光遅延装置と、前記被検体から回帰する光と前記高速光遅延装置から回帰する参照光とを合波する前記２分割用光ファイバカプラと、
同２分割用光ファイバカプラで合波された干渉光を検出する干渉光検出器とを備えてなることを特徴とするＯＣＴ装置。 A low-coherence light source, a two-split optical fiber coupler that divides the light from the low-coherence light source into irradiation light to the subject and reference light, and high-speed light that delays the reference light by a linear reciprocating motion at high speed A delay device, and the two-divided optical fiber coupler for combining the light returning from the subject and the reference light returning from the high-speed optical delay device;
An OCT apparatus comprising: an interference light detector that detects interference light combined by the two-divided optical fiber coupler. 前記高速光遅延装置が、高速で直線状に往復運動する高速リニヤアクチエータと、同高速リニヤアクチエータの往復運動体の前端に直線方向に光を反射するように配設された反射鏡と、さらにその前方に光ファイバに接続されたコリメートレンズを配設してなることを特徴とする請求項３に記載のＯＣＴ装置。
The high-speed optical delay device is a high-speed linear actuator that reciprocates linearly at high speed, and a reflecting mirror that is arranged to reflect light in a linear direction at the front end of the reciprocating body of the high-speed linear actuator; The OCT apparatus according to claim 3, further comprising a collimator lens connected to an optical fiber in front of the OCT apparatus.
JP2006044107A 2006-02-21 2006-02-21 Optical diagnostic method and device by oct Pending JP2007225320A (en)

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Publication number Priority date Publication date Assignee Title
CN102736234A (en) * 2012-06-19 2012-10-17 天津市索维电子技术有限公司 Hollow cube-corner prism optical delay line device with endogenous scale light source
CN102736234B (en) * 2012-06-19 2013-12-18 天津市索维电子技术有限公司 Hollow cube-corner prism optical delay line device with endogenous scale light source

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