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WO2016189627A1 - Dispositif de balayage à fibre optique, dispositif d'éclairage et dispositif d'observation - Google Patents

Dispositif de balayage à fibre optique, dispositif d'éclairage et dispositif d'observation Download PDF

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Publication number
WO2016189627A1
WO2016189627A1 PCT/JP2015/064954 JP2015064954W WO2016189627A1 WO 2016189627 A1 WO2016189627 A1 WO 2016189627A1 JP 2015064954 W JP2015064954 W JP 2015064954W WO 2016189627 A1 WO2016189627 A1 WO 2016189627A1
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WIPO (PCT)
Prior art keywords
optical fiber
elastic portion
alternating voltage
illumination
frequency
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.)
Ceased
Application number
PCT/JP2015/064954
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English (en)
Japanese (ja)
Inventor
博一 横田
靖明 葛西
博士 鶴田
盛通 清水
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.)
Olympus Corp
Original Assignee
Olympus Corp
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Publication date
Application filed by Olympus Corp filed Critical Olympus Corp
Priority to JP2017520101A priority Critical patent/JPWO2016189627A1/ja
Priority to PCT/JP2015/064954 priority patent/WO2016189627A1/fr
Publication of WO2016189627A1 publication Critical patent/WO2016189627A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated

Definitions

  • the present invention relates to a fiber optic scanner, an illumination device and an observation device.
  • an optical fiber scanner in which a cantilever optical fiber is bent and vibrated by a lead zirconate titanate (PZT) actuator to scan light emitted from the tip of the cantilever optical fiber (for example, a patent).
  • PZT lead zirconate titanate
  • Reference 1. a cantilever optical fiber and a tubular PZT actuator are held in a cantilever shape by a common base, and vibrations generated by the PZT actuator are transmitted to the cantilever optical fiber through the base.
  • Patent No. 5069105 gazette
  • the dimensions of the cantilever optical fiber and the dimensions of the PZT actuator and the base approximate each other, and their natural frequencies also approximate each other. Resonance is more likely to occur, making it more difficult to ensure the stability of the light scan.
  • the present invention has been made in view of the above-described circumstances, and is an optical fiber scanner, an illumination device, and an observation capable of stably obtaining a desired scanning locus by stabilizing the vibration of the optical fiber even if the size is reduced. It aims at providing an apparatus.
  • an elongated optical fiber for guiding light and emitting light from a tip, and the optical fiber so as to cover the outer peripheral surface of the optical fiber at a position spaced apart from the tip to the proximal side.
  • the piezoelectric device further comprising: a piezoelectric element that causes the elastic portion to generate bending vibration in a direction intersecting the longitudinal direction; and a fixing portion fixed to the elastic portion at a base end side with respect to the piezoelectric element
  • An optical fiber scanner having a natural frequency different from the predetermined frequency of.
  • the position of the fixing portion is a node and a frequency equal to the frequency of the alternating voltage
  • the bending vibration is generated in the elastic portion, and the bending vibration is transmitted to the optical fiber.
  • the portion (projected portion) on the tip end side of the elastic portion of the optical fiber is supported by the elastic portion in a cantilever shape with the tip end being a free end, so the tip of the optical fiber is bent by bending vibration transmitted from the elastic portion Vibrates in a direction intersecting the longitudinal direction, and light emitted from the tip of the optical fiber is scanned in a direction crossing the traveling direction of the light.
  • the optical fiber scanner since the elastic portion is provided between the piezoelectric element and the optical fiber, the optical fiber scanner has a structure with high rigidity as a whole, so that the vibration of the low order mode hardly occurs. Furthermore, since the elastic portion has a natural frequency different from the frequency of the alternating voltage, the elastic portion does not resonate with the bending vibration of the projecting portion of the optical fiber, and the elastic portion functions as a resonance preventing means . Therefore, the generation of vibration modes other than the predetermined frequency is prevented, and the protrusion of the optical fiber continues to vibrate stably in the single frequency vibration mode. Thereby, the vibration of the optical fiber can be stabilized and a desired scanning locus can be stably obtained.
  • the natural frequency of the elastic portion may be smaller than a predetermined frequency of the alternating voltage.
  • the natural frequency of the elastic portion decreases as the outer diameter of the elastic portion decreases. Therefore, the diameter of the optical fiber scanner can be reduced by reducing the outer diameter of the elastic portion such that the natural frequency of the elastic portion is smaller than the natural frequency of the protrusion of the optical fiber.
  • the natural frequency of the elastic portion may be larger than a predetermined frequency of the alternating voltage. In this way, it is possible to prevent the resonance of the elastic portion in the process of increasing the frequency of the alternating voltage from the frequency smaller than the predetermined frequency to the predetermined frequency at the start of the application of the alternating voltage.
  • the natural frequency of the elastic portion increases as the dimension in the longitudinal direction of the elastic portion decreases. Therefore, by shortening the length of the elastic portion so that the natural frequency of the elastic portion becomes larger than the natural frequency of the protrusion of the optical fiber, the hard portion on the tip side of the fixing portion can be shortened. it can.
  • a second aspect of the present invention is an illumination apparatus comprising: a light source generating illumination light; and the optical fiber scanner according to any one of the above, which scans the illumination light from the light source.
  • a third aspect of the present invention in the illumination device described above, a light detection unit that detects return light returning from the subject by irradiating the subject with illumination light from the illumination device, and the piezoelectric element. And a voltage supply unit configured to supply an alternating voltage of the predetermined frequency.
  • the present invention it is possible to stabilize the vibration of the optical fiber and stably obtain a desired scanning locus even if the size is reduced.
  • FIG. 2B is a front view of another variation of the fiber optic scanner of FIG. 2A.
  • FIG. 2B is a front view of another variation of the fiber optic scanner of FIG. 2A.
  • the observation device 100 is an endoscope device, and as shown in FIG. 1, a light source 1 for generating illumination light, and an illumination device 3 for irradiating illumination light to a subject (not shown), A light detector (light detection unit) 5 such as a photodiode for detecting return light returning from the subject by being irradiated with illumination light, a drive control device for driving and controlling the lighting device 3 and the light detector 5 (voltage supply Part) and 7 are provided.
  • a light detector (light detection unit) 5 such as a photodiode for detecting return light returning from the subject by being irradiated with illumination light
  • a drive control device for driving and controlling the lighting device 3 and the light detector 5 (voltage supply Part) and 7 are provided.
  • the illumination device 3 is disposed on the tip side of the optical fiber scanner 10 having the illumination optical fiber 11 for guiding the illumination light emitted from the light source 1 and emitting the light from the tip, and for illumination
  • a plurality of detection optical fibers 17 for guiding return light from the subject (for example, reflected light or fluorescence of illumination light) to the light detector 5.
  • the light source 1 and the light detector 5 are disposed on the proximal end side of the optical fiber scanner 10.
  • the optical fiber scanner 10 is, as shown in FIG. 2A, spaced apart from the tip of the illumination optical fiber (optical fiber) 11 such as a multimode fiber or a single mode fiber and the illumination optical fiber 11 to the proximal side.
  • the elastic portion 21 made of an elastic material provided at one position, the four piezoelectric elements 23A and 23B fixed to the elastic portion 21, and the fixing portion 25 for fixing the base end of the elastic portion 21 to the frame 15.
  • lead wires 27A, 27B for supplying an alternating voltage to the piezoelectric elements 23A, 23B.
  • the illumination optical fiber 11 is made of an elongated glass material and is disposed along the longitudinal direction of the frame 15.
  • the tip of the illumination optical fiber 11 is disposed in the vicinity of the tip inside the frame 15.
  • the proximal end of the illumination optical fiber 11 extends from the proximal end of the frame 15 to the outside and is connected to the light source 1.
  • the longitudinal direction of the illumination optical fiber 11 is taken as the Z direction
  • two radial directions orthogonal to each other of the illumination optical fiber 11 are taken as the X direction and the Y direction.
  • the elastic portion 21 is a cylindrical member made of a metal having elasticity, such as nickel or copper, and has a fitting hole 21a penetrating along the longitudinal axis.
  • the illumination optical fiber 11 is inserted into the fitting hole 21a, and the inner surface of the fitting hole 21a and the outer peripheral surface of the illumination optical fiber 11 are adhered and fixed to each other by an epoxy-based adhesive.
  • the tip end portion of the illumination optical fiber 11 protruding from the tip end surface of the elastic portion 21 to the tip end will be referred to as a projecting portion 11 a.
  • the elastic part 21 does not necessarily need to be comprised only from an elastic material, if the resonance prevention function mentioned later can be exhibited effectively.
  • the piezoelectric elements 23A and 23B are rectangular flat plates made of a piezoelectric ceramic material such as lead zirconate titanate (PZT), for example.
  • PZT lead zirconate titanate
  • positive electrode processing is performed on the front surface
  • negative electrode processing is performed on the rear surface, and thereby, polarization is performed in the thickness direction from the positive electrode to the negative electrode.
  • Arrow P in the drawing indicates the polarization direction of the piezoelectric elements 23A and 23B.
  • the four piezoelectric elements are composed of two A-phase piezoelectric elements 23A and two B-phase piezoelectric elements 23B.
  • the piezoelectric elements 23A for the A phase and the piezoelectric elements 23B for the B phase are alternately arranged at equal intervals in the circumferential direction of the elastic portion 21 as shown in FIG. 2B. It is fixed.
  • the two piezoelectric elements 23A for A phase facing each other in the X direction are arranged such that the polarization directions are the same as the X direction, and the two piezoelectric elements 23B for phase B facing each other in the Y direction are The polarization directions are arranged to be the same as the Y direction.
  • the fixing portion 25 is a cylindrical member, and is fixed to the outer peripheral surface of the base end portion of the elastic portion 21 by being fitted to the base end portion of the elastic portion 21 located closer to the base end than the piezoelectric elements 23A and 23B. It is done.
  • the outer peripheral surface of the fixing portion 25 is fixed to the inner wall of the frame 15.
  • the elastic portion 21 is supported by the fixing portion 25 in a cantilever shape whose free end is at the tip end, and the protrusion 11a of the optical fiber 11 for illumination is an elastic portion in a cantilever shape whose free end is at the tip Supported by 21.
  • the fixing portion 25 is electrically connected to the electrodes on the elastic portion 21 side of the four piezoelectric elements 23A and 23B, and functions as a common GND when driving the piezoelectric elements 23A and 23B. There is.
  • a lead wire 27A for A phase is joined to the two piezoelectric elements 23A for A phase by a conductive adhesive.
  • a lead wire 27B for B phase is bonded to the two B phase piezoelectric elements 22B by a conductive adhesive.
  • the GND lead 27 ⁇ / b> G is joined to the fixed portion 25.
  • grooves extending in the Z direction are formed at four places spaced in the circumferential direction, and one lead wire 27A, 27B is accommodated in each groove.
  • Each lead wire 27A, 27B, 27G is connected to the drive control device 7.
  • the projecting portion 11a and the elastic portion 21 of the illumination optical fiber 11 have a cantilever structure in which each tip is a free end. Therefore, the natural frequencies F1 and F2 (Hz) of the projecting portion 11a of the optical fiber 11 for illumination and the elastic portion 21 are Young's modulus E (N / m 2 ), second moment of area I (m 4 ), XY
  • the cross-sectional area A (m 2 ) in a plane, the length L (m) in the Z direction, and the density ⁇ (Kg / m 3 ) are each expressed by the following equation (1).
  • ⁇ is a dimensionless coefficient determined by the vibration mode.
  • the second moment of area I1 and the cross sectional area A1 of the projecting portion 11a of the optical fiber 11 for illumination are expressed by the following formulas (2) and (3) using the diameter ⁇ 1 of the optical fiber 11 for illumination.
  • the cross-sectional secondary moment I2 and the cross-sectional area A2 of the elastic portion 21 are expressed as the following equations (4) and (5) using the outer diameter ⁇ out and the inner diameter ⁇ in of the elastic portion 21. Therefore, the natural frequency F1 of the projecting portion 11a of the illumination optical fiber 11 can be determined from the equations (1), (2), and (3), and the elastic portion is determined from the equations (1), (4), and (5).
  • the natural frequency F2 of 21 can be obtained. As seen from the equations (1), (4) and (5), the natural frequency F2 of the elastic portion 21 depends on the density ⁇ , the outer diameter ⁇ out, the inner diameter ⁇ in, and the length L of the material.
  • the drive control device 7 applies an A-phase alternating voltage having a predetermined drive frequency to the A-phase piezoelectric element 23A through the lead wire 27A, and a predetermined B-phase piezoelectric element 23B through the lead wire 27B.
  • the alternating voltage of B phase which has the drive frequency of is applied.
  • the predetermined drive frequency is set to a frequency equal to the natural frequency F1 of the protrusion 11a of the illumination optical fiber 11 or a frequency near the natural frequency F1.
  • the drive control device 7 supplies to each of the lead wires 27A and 27B an alternating voltage of A phase and an alternating voltage of B phase whose phases are different from each other by ⁇ / 2 and whose amplitude changes sinusoidally.
  • the elastic portion 21 has a natural frequency F2 different from the predetermined drive frequency of the alternating voltage, that is, the natural frequency F2 different from the natural frequency F1 of the projecting portion 11a of the illumination optical fiber 11
  • the materials and their respective dimensions ⁇ out, ⁇ in, L are designed to have
  • the drive control device 7 is operated to supply illumination light from the light source 1 to the illumination optical fiber 11, and through the lead wires 27A and 27B.
  • An alternating voltage having a predetermined drive frequency is applied to the piezoelectric elements 23A and 23B.
  • the piezoelectric element 23A for the A phase to which the alternating voltage of the A phase is applied vibrates in the Z direction orthogonal to the polarization direction. At this time, when one of the two piezoelectric elements 23A is contracted in the Z direction and the other is expanded in the Z direction, bending vibration in the X direction is excited in the elastic portion 21 with the position of the fixing portion 25 as a node. Be done.
  • the bending vibration of the elastic portion 21 is transmitted to the optical fiber 11 for illumination, whereby the protruding portion 11a is bent and vibrated in the X direction at a frequency equal to the drive frequency of the alternating voltage, and the tip of the optical fiber 11 is in the X direction
  • the illumination light emitted from the tip is oscillated and linearly scanned in the X direction.
  • the piezoelectric element 23B for the B phase to which the alternating voltage of the B phase is applied vibrates in the Z direction orthogonal to the polarization direction.
  • one of the two piezoelectric elements 23B is contracted in the Z direction and the other is expanded in the Z direction, bending vibration in the Y direction having the position of the fixed portion 25 in the elastic portion 21 is excited. Ru.
  • the bending vibration of the elastic portion 21 is transmitted to the optical fiber 11 for illumination, whereby the projecting portion 11a is bent and vibrated in the Y direction at a frequency equal to the drive frequency of the alternating voltage, and the illumination light emitted from the tip is Y It is scanned linearly in the direction.
  • the phase of the alternating voltage of phase A and the phase of the alternating voltage of phase B are mutually shifted by ⁇ / 2, and the amplitudes of the alternating voltage of phase A and the alternating voltage of phase B change sinusoidally with time.
  • the tip of the illumination optical fiber 11 vibrates along the spiral trajectory, and the illumination light is two-dimensionally scanned along the spiral trajectory on the subject.
  • the drive frequency is a frequency equal to or near the natural frequency F1 of the protrusion 11a, the protrusion 11a can be excited efficiently.
  • the return light from the subject is received by the plurality of detection optical fibers 17, and the intensity thereof is detected by the light detector 5.
  • the drive control device 7 causes the light detector 5 to detect the return light in synchronization with the scanning period of the illumination light, and generates the image of the subject by associating the detected intensity of the return light with the scanning position of the illumination light.
  • the elastic portion 21 is provided between the piezoelectric elements 23A and 23B and the illumination optical fiber 11, so that the optical fiber scanner 10 has a high rigidity as a whole. Therefore, it is difficult to generate a low-order vibration mode lower than the drive frequency. Furthermore, since the natural frequency F2 of the elastic portion 21 is different from the drive frequency of the alternating voltage, the elastic portion 21 vibrates in resonance with the vibration at the drive frequency of the projecting portion 11a of the illumination optical fiber 11. Is prevented. Therefore, a vibration mode different from the drive frequency does not occur, and only a single vibration mode occurs in the illumination optical fiber 11. Thus, the protrusion 11a of the illumination optical fiber 11 can be stably vibrated at a predetermined drive frequency, and the illumination light can be stably scanned along a desired spiral locus.
  • the dimensional difference between the projecting portion 11a and the elastic portion 21 becomes small, and the natural frequency F1 of the projecting portion 11a and the natural frequency F2 of the elastic portion 21 become close to each other. Therefore, in the small-sized optical fiber scanner 10, the elastic portion 21 easily resonates in accordance with the vibration of the protrusion 11a, and a vibration mode having a frequency other than the driving frequency is easily generated.
  • the natural frequency F1 of the projecting portion 11a of the illumination optical fiber 11 and the natural frequency F2 of the elastic portion 21 are selected by the selection of the material of the elastic portion 21 and the design of the dimensions L, ⁇ out, ⁇ in. A difference can be secured, and resonance vibration of the elastic portion 21 can be reliably prevented.
  • the natural frequency F2 of the elastic portion 21 may be smaller than the drive frequency of the alternating voltage.
  • the frequency is swept from the frequency smaller than the drive frequency to the drive frequency so that the vibration amplitude of the protrusion 11a gradually increases. Therefore, by making the natural frequency F2 of the elastic portion 21 larger than the drive frequency of the alternating voltage, it is possible to prevent the elastic portion 21 from resonating and vibrating during the sweep of the frequency of the alternating voltage.
  • the natural frequency F2 of the elastic portion 21 may be larger than the drive frequency of the alternating voltage.
  • the elastic portion 21 has a cylindrical shape, but instead, the elastic portion 21 may have a rectangular cylindrical shape as shown in FIG.
  • FIG. 5 shows an elastic portion 21 in the form of a square cylinder as an example.
  • the cross-sectional secondary moment I 2 ′ and the cross-sectional area A 2 ′ of the square-square-tube-shaped elastic portion 21 are respectively expressed by the following equations (6) and (7) using the length d of one side.

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Abstract

L'invention concerne un dispositif de balayage à fibre optique (10) qui comprend : une fibre optique (11) ; une partie élastique tubulaire (21) fixée à une surface périphérique extérieure de la fibre optique (11) à un emplacement espacé de l'extrémité distale vers l'extrémité de base pour éviter la résonance ; des éléments piézoélectriques (23A, 23B) qui sont fixés à une surface périphérique extérieure de la partie élastique (21) et qui génèrent des vibrations de flexion dans la partie élastique (21) lorsqu'une tension alternative d'une fréquence prédéterminée est appliquée ; une partie fixe (25) qui est fixée à la partie élastique (21) à proximité des éléments piézoélectriques (23A, 23B). La partie élastique (21) possède une fréquence naturelle qui est différente de la fréquence prédéterminée de la tension alternative.
PCT/JP2015/064954 2015-05-25 2015-05-25 Dispositif de balayage à fibre optique, dispositif d'éclairage et dispositif d'observation Ceased WO2016189627A1 (fr)

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JP2017520101A JPWO2016189627A1 (ja) 2015-05-25 2015-05-25 光ファイバスキャナ、照明装置および観察装置
PCT/JP2015/064954 WO2016189627A1 (fr) 2015-05-25 2015-05-25 Dispositif de balayage à fibre optique, dispositif d'éclairage et dispositif d'observation

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018170011A1 (fr) * 2017-03-15 2018-09-20 Magic Leap, Inc. Techniques permettant d'améliorer un système de balayage de fibre
CN114690401A (zh) * 2020-12-31 2022-07-01 成都理想境界科技有限公司 一种扫描致动器及光纤扫描器

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JP2001042238A (ja) * 1999-07-29 2001-02-16 Ricoh Co Ltd マルチビーム走査装置
JP2010097083A (ja) * 2008-10-17 2010-04-30 Hoya Corp 光ファイバスキャナおよび内視鏡装置
JP2010162089A (ja) * 2009-01-13 2010-07-29 Hoya Corp 光走査型内視鏡
WO2014065025A1 (fr) * 2012-10-22 2014-05-01 オリンパスメディカルシステムズ株式会社 Système d'endoscope à balayage

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Publication number Priority date Publication date Assignee Title
JP5371222B2 (ja) * 2006-09-14 2013-12-18 オプティスカン・ピーティーワイ・リミテッド 光ファイバ走査装置
JP2010268961A (ja) * 2009-05-21 2010-12-02 Hoya Corp 医療用観察システム

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Publication number Priority date Publication date Assignee Title
JP2001042238A (ja) * 1999-07-29 2001-02-16 Ricoh Co Ltd マルチビーム走査装置
JP2010097083A (ja) * 2008-10-17 2010-04-30 Hoya Corp 光ファイバスキャナおよび内視鏡装置
JP2010162089A (ja) * 2009-01-13 2010-07-29 Hoya Corp 光走査型内視鏡
WO2014065025A1 (fr) * 2012-10-22 2014-05-01 オリンパスメディカルシステムズ株式会社 Système d'endoscope à balayage

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018170011A1 (fr) * 2017-03-15 2018-09-20 Magic Leap, Inc. Techniques permettant d'améliorer un système de balayage de fibre
US10502948B2 (en) 2017-03-15 2019-12-10 Magic Leap, Inc. Techniques for improving a fiber scanning system
JP2020514815A (ja) * 2017-03-15 2020-05-21 マジック リープ， インコーポレイテッドＭａｇｉｃ Ｌｅａｐ，Ｉｎｃ． ファイバ走査システムを改良するための技法
US10775611B2 (en) 2017-03-15 2020-09-15 Magic Leap, Inc. Techniques for improving a fiber scanning system
JP7021246B2 (ja) 2017-03-15 2022-02-16 マジック リープ， インコーポレイテッド ファイバ走査システムを改良するための技法
JP2022048341A (ja) * 2017-03-15 2022-03-25 マジック リープ， インコーポレイテッド ファイバ走査システムを改良するための技法
US11409100B2 (en) 2017-03-15 2022-08-09 Magic Leap, Inc. Techniques for improving a fiber scanning system
JP7274011B2 (ja) 2017-03-15 2023-05-15 マジック リープ， インコーポレイテッド ファイバ走査システムを改良するための技法
CN114690401A (zh) * 2020-12-31 2022-07-01 成都理想境界科技有限公司 一种扫描致动器及光纤扫描器

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