WO2016167204A1 - Sonde optique - Google Patents

Sonde optique Download PDF

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Publication number
WO2016167204A1
WO2016167204A1 PCT/JP2016/061648 JP2016061648W WO2016167204A1 WO 2016167204 A1 WO2016167204 A1 WO 2016167204A1 JP 2016061648 W JP2016061648 W JP 2016061648W WO 2016167204 A1 WO2016167204 A1 WO 2016167204A1
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WIPO (PCT)
Prior art keywords
optical system
optical
optical fiber
mold
observation light
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PCT/JP2016/061648
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English (en)
Japanese (ja)
Inventor
大 佐々木
芳享 為國
Original Assignee
住友電気工業株式会社
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
Priority claimed from JP2015155591A external-priority patent/JP2016202866A/ja
Application filed by 住友電気工業株式会社 filed Critical 住友電気工業株式会社
Priority to EP16779995.6A priority Critical patent/EP3284387A4/fr
Priority to US15/566,148 priority patent/US20180087893A1/en
Publication of WO2016167204A1 publication Critical patent/WO2016167204A1/fr

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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 an optical probe used in optical coherence tomography (OCT).
  • OCT optical coherence tomography
  • OCT optical coherence tomography
  • OCT measurement an optical probe is inserted in the vicinity of an object, and observation light is irradiated from the optical probe. Observation light reflected back from the object is acquired by the optical probe.
  • the optical probe is a sheath that transmits the observation light, an optical fiber that is disposed in the sheath and guides the observation light between the proximal end and the distal end of the optical probe, and deflects the observation light to the side of the optical probe.
  • a deflection optical system is provided.
  • the observation light deflected by the deflection optical system passes through the side wall of the sheath.
  • the sheath is cylindrical, the side wall has a shape having no curvature in the longitudinal direction, but has a curvature in a direction perpendicular to the longitudinal direction.
  • JP2004-223269 Patent Document 1
  • JP2011-519692 Patent Document 2
  • JP2009-523581 Patent Document 3
  • JP2008-514383 Patent Document 4
  • WO2008 / 081653 Patent Document 5
  • An object of the present invention is to provide an optical probe that can be easily manufactured and can acquire a high-resolution tomographic image.
  • a proximal end connected to the measurement unit of the OCT apparatus, and a distal end that irradiates observation light, an optical fiber, a condensing optical system, a deflection optical system, a sheath,
  • An optical probe of the present invention including a compensation unit is provided.
  • the optical fiber transmits observation light between the proximal end and the distal end.
  • the condensing optical system is optically connected to the optical fiber at the distal end, and condenses the observation light emitted from the optical fiber.
  • the deflecting optical system is optically connected to the condensing optical system at the distal end, and deflects the observation light emitted from the optical fiber.
  • the sheath extends along the first direction, accommodates the optical fiber, the condensing optical system, and the deflection optical system along the first direction, and has a curved surface portion having a curvature in a cross section orthogonal to the first direction.
  • the observation light deflected by the deflecting optical system is transmitted through the curved surface portion in the second direction intersecting the first direction, and the observation light is emitted from the distal end.
  • the compensation unit is housed in the sheath and extends along the first direction over a range including a part of the optical fiber, the condensing optical system, and the deflection optical system, and is generated when the observation light passes through the curved surface unit. Compensates for optical aberrations.
  • the compensator is configured integrally with the optical fiber, the condensing optical system, and the deflecting optical system by covering a part of the optical fiber, the outer periphery of the condensing optical system, and the deflecting optical system.
  • the compensator is integrated with the optical fiber, the condensing optical system, and the deflecting optical system by covering the outer periphery of the glass fiber, the condensing optical system, and the deflecting optical system that are exposed after the coating is removed from the optical fiber.
  • the condensing optical system is a Grin lens having a diameter larger than that of the glass fiber and smaller than that of the covering portion. It is.
  • the outer edge of the compensating part is located inside the outer edge of the covering part. Is preferred.
  • the refractive index of the compensation unit is larger than the refractive index of the medium filling the space between the compensation unit and the sheath, and the curvature of the portion through which the observation light passes through the compensation unit is transmitted by the observation light through the compensation unit. It is preferable that the curvature is smaller than the curvature of the portion other than the portion to be performed.
  • the compensation unit faces the first mold part including a part extending in the first direction and transmitting the observation light, and the part extending in the first direction and transmitting the observation light.
  • a second mold part that does not include a transparent part, and the first mold part and the second mold part are perpendicular to a plane extending between the first direction and the second direction, and are parallel to the first direction.
  • the center of the optical fiber may be on the second mold part side of the boundary surface within the cross section orthogonal to the first direction.
  • the compensation unit may include a convex part that protrudes from the outer periphery of the compensation unit toward the sheath in part along the first direction.
  • a method for producing the optical probe of the present invention is provided.
  • a first mold that forms a first mold part including a part that extends in the first direction and transmits observation light in the compensation part is opposed to the first mold part adjacent to the first mold part.
  • a space is determined by combining a second mold that forms a second mold part that does not include a portion through which light is transmitted, and a part of the optical fiber, a condensing optical system, and a deflecting optical system are disposed inside the space,
  • Each step includes filling the resin inside the space and curing.
  • the first mold is so arranged that the center of the optical fiber is on the second mold side of the boundary surface between the first mold part and the second mold part in the cross section orthogonal to the first direction.
  • the second mold may be divided.
  • an optical probe that is easy to manufacture and that can acquire a high-resolution tomographic image.
  • FIG. 1 is a conceptual diagram of an OCT apparatus including an optical probe according to an embodiment of the present invention.
  • FIG. 2A is a YZ sectional view of the distal end of the optical probe in FIG. 2B is a front view of the glass fiber, the covering portion, the mold portion, and the Grind lens viewed from the Z direction at the distal end of the optical probe in FIG.
  • FIG. 3 is a perspective view showing a YZ section of the distal end of the optical probe of FIG.
  • FIG. 4 is a conceptual diagram illustrating the operation of the optical probe of FIG.
  • FIG. 5 is a YZ sectional view and an XY sectional view for explaining the optical path of the observation light according to the comparative example.
  • FIG. 6 is a YZ sectional view and an XY sectional view for explaining the optical path of the observation light according to the embodiment of the present invention.
  • FIG. 7 is an XZ sectional view of an optical probe according to a modification of the embodiment of the present invention.
  • FIG. 8 is a view for explaining the method of manufacturing the optical probe according to the embodiment of the present invention, and is a front view of the optical fiber and the Grind lens arranged in the mold as viewed from the front end side of the optical fiber.
  • FIG. 9 is a view for explaining an optical probe manufacturing method according to another embodiment of the present invention, and is a front view of an optical fiber and a Grind lens arranged in a mold as viewed from the front end side of the optical fiber. .
  • FIG. 10 is a diagram for explaining an optical probe manufacturing method according to a modification of the embodiment of the present invention, and is a front view of an optical fiber and a Grind lens arranged in a mold as viewed from the front end side of the optical fiber. is there.
  • FIG. 1 is a conceptual diagram of an OCT apparatus 1 including an optical probe 10 according to an embodiment of the present invention.
  • the OCT apparatus 1 includes an optical probe 10 and a measurement unit 30 and acquires an optical coherence tomographic image of the object 3.
  • the optical probe 10 includes a proximal end 10a and a distal end 10b, and a hand piece 16 therebetween.
  • the optical fiber 11 extends from the proximal end 10 a toward the distal end 10 b and is inserted into a through hole 16 ⁇ / b> A in the handpiece 16.
  • the optical probe 10 can grasp the handpiece 16 and insert the distal end 10b into a living body to be observed, and can place the tip of the distal end 10b near the site to be observed.
  • the eyelid measuring unit 30 includes a light source 31, a branching unit 32, a detecting unit 33, a terminal 34, a reflecting mirror 35, an analyzing unit 36, and an output port 37.
  • the light output from the light source 31 is branched into observation light and reference light at the branching section 32.
  • the observation light is output to the proximal end 10a of the optical probe 10, propagates through the optical fiber 11, and is irradiated onto the object 3 from the distal end 10b.
  • the back reflection light generated in response to the observation light irradiation on the eyelid object 3 is incident on the optical fiber 11 again from the distal end 10b and is input to the branching portion 32 from the proximal end 10a.
  • the reference light is emitted from the terminal 34 to the reflecting mirror 35, enters the terminal 34 again, and is input to the branching unit 32.
  • the observation light and the reference light incident on the branch part 32 interfere with each other by being combined at the branch part 32, and the interference light is detected by the detection part 33.
  • the spectrum of the interference light is analyzed by the analysis unit 36, and the distribution of the back reflection efficiency at each point on the internal cross section of the object 3 is calculated. Based on the calculation result, a tomographic image of the object 3 is calculated, and an image signal is output from the output port 37.
  • the mechanism in which the observation light returns to the distal end 10b again via the object 3 includes reflection, refraction, and scattering. However, since these differences are not essential to the present invention, these are collectively referred to as back reflection in this specification for the sake of brevity.
  • the optical fiber 11 includes an optical connector 12 on the proximal end 10 a side, and is optically connected to the measurement unit 30 via the optical connector 12.
  • the OCT apparatus 1 acquires an optical coherence tomographic image of a predetermined range of the object 3 by rotating the optical fiber 11 by rotating the optical connector 12 and scanning the observation light in the circumferential direction.
  • the fluorescent probe 10 includes a support tube 14 that covers the outer periphery of the optical fiber 11 and a jacket tube 15 that covers the outer periphery of the support tube 14 on the proximal end 10 a side from the handpiece 16.
  • the optical fiber 11 and the support tube 14 are fixed to the optical connector 12 and are rotatable with respect to the jacket tube 15.
  • the heel support tube 14 is a metal hollow member, and may be a thin tubular pipe member, or may be a tube formed by twisting fibrous metal to adjust flexibility.
  • the support tube 14 has an inner diameter of, for example, 0.4 to 0.6 mm, and can pass a coated single mode optical fiber having an outer diameter of 0.25 mm.
  • the thickness of the support tube 14 is preferably about 0.3 mm to 0.7 mm. Accordingly, the outer diameter of the support tube is about 1 to 2 mm.
  • the handpiece 16 has a through hole 16A through which the optical fiber 11 is inserted, and the through hole 16A has a first portion 16a, a second portion 16b, and a third portion in order from the proximal end 10a side to the distal end side 10b.
  • a portion 16c and a fourth portion 16d are provided.
  • the first portion 16 a is a portion that fixes the jacket tube 15.
  • the second portion 16b accommodates the optical fiber 11 and the support tube 14 rotatably.
  • the third portion 16c accommodates the optical fiber 11 rotatably.
  • the fourth portion 16d fixes the distal end 10b (a metal tube 17 and a sheath 18 described later) and accommodates the optical fiber 11 in a rotatable manner.
  • FIG. 2A is a YZ sectional view of the distal end 10b of the optical probe 10.
  • FIG. 3 is a perspective view showing a YZ section of the distal end 10b of the optical probe 10.
  • an XYZ orthogonal coordinate system that is set so that the direction in which the optical fiber extends coincides with the Z direction is shown.
  • the distal end 10 b includes an optical fiber 11, a Grin lens 13 optically connected to the optical fiber 11, and a metal tube 17 that covers the optical fiber 11 and the Grin lens 13.
  • a resin sheath 18 covering the metal tube 17 is provided.
  • the optical fiber 11 and the Grin lens 13 are integrated by a mold part 19.
  • the mold part 19 includes a compensation part 19b on the lower surface from which the observation light L is emitted. The configuration and operation of the compensation unit 19b will be described later.
  • the scissors sheath 18 hermetically seals the internal space SP.
  • the internal space SP may be a space or may be filled with a fluid.
  • the outer diameter d1 of the sheath 18 is 1 mm or less, and is preferably smaller than the outer diameter of the support tube 14.
  • the metal tube 17 has a slit SL formed by cutting away from the end in the Z direction.
  • the optical fiber 11 is a single-mode optical fiber, and covers a glass fiber 11a composed of a high refractive index core (not shown) that propagates light and a low refractive index clad (not shown) that surrounds the core, and the glass fiber 11a.
  • a coating 11b is provided.
  • the coating 11 b is removed by a predetermined length at the end on the distal end 10 b side to expose the glass fiber 11 a, and a Grin lens 13 is fused and connected to the tip of the optical fiber 11.
  • the glass fiber 11a and the Grin lens 13 are surrounded by the mold part 19, and the optical fiber 11, the Grin lens 13, and the mold part 19 are integrally configured.
  • the diameters of the glass fiber 11a and the Grin lens 13 in the XY section perpendicular to the optical axis may be equal, or the diameter of the Grin lens is slightly increased (about 1.02 to 1.10 times the diameter of the glass fiber 11a). You can leave it. By providing a difference in diameter, the boundary between the Grin lens 13 and the glass fiber 11a can be easily recognized, so that the length of the Grin lens 13 can be easily managed.
  • the heel mold part 19 is formed by fusing the glass fiber 11a and the Grin lens 13, and then placing the optical fiber 11 in a mold, filling it with resin, and curing it.
  • the outer diameter of the mold part 19 is preferably equal to each other in the outer peripheral part of the glass fiber 11 a and the outer peripheral part of the Grin lens 13. Thereby, the difference of the outer diameter of the glass fiber 11a and the Grind lens 13 is comprised so that it may be absorbed in the mold part 19.
  • FIG. Therefore, the structure of the optical fiber 11, the Grin lens 13, and the mold part 19 that are integrally formed is a structure having good symmetry with respect to the Z direction.
  • the mold part 19 may be made of a resin that transmits the observation light L, or a glass fiber 11a and a Grind lens inside a pipe-shaped member made of a material that transmits the observation light L such as a glass capillary. 13 may be inserted and fixed by bonding.
  • the outer diameter d2 of the mold part 19 is set to be equal to or smaller than the diameter of the covering part 11b.
  • the diameter of the glass fiber 11a is about 0.125 mm
  • the diameter of the covering portion 11b is about 0.25 mm
  • the outer diameter d2 of the mold portion 19 is 0.125 mm.
  • the inner diameter d3 of the metal tube 17 is preferably about 0.3 to 0.5 mm.
  • the mold part 19 is comprised with resin with a small friction coefficient, such as a fluororesin.
  • the 2 (b) is a front view of the glass fiber 11a, the coating 11b, the mold part 19, and the Grin lens 13 at the distal end of the optical probe 10 as viewed from the Z direction.
  • the Grin lens which is a condensing optical system and a deflecting optical system, has a shape that fits within the cross section of the coating.
  • the mold part 19 and the compensation part 19a, which is a part of the mold part 19, are shaped to fit within the cross section of the coating. Thereby, the optical fiber 11, the mold part 19, and the Grin lens 13 which rotate within the far end part 10b have a tapered shape as a whole.
  • the rotational torque when the rotational torque is transmitted to the distal end 10b via the optical fiber 11, it is possible to prevent the tip of the optical fiber 11 from moving out of the Z axis as the rotation axis in the sheath 18, and to efficiently operate.
  • the rotational torque can be transmitted to the deflection optical system.
  • FIG. 4 is a conceptual diagram for explaining the operation of the optical probe 10.
  • the end surface of the Grin lens 13 includes a reflecting surface 13a inclined at an angle ⁇ with respect to the Z axis.
  • the light can be totally reflected and deflected by the refractive index difference between the Grin lens 13 and the internal space SP. Therefore, the Grin lens 13 has a function as a deflection optical system of the present invention.
  • the Grin lens 13 also has a function as a condensing optical system of the present invention, and condenses and emits the light emitted from the core of the optical fiber 11.
  • the Grin lens 13 has a refractive index distribution in which the refractive index n gradually decreases as the distance r from the optical axis extending in the Z direction increases, and the refractive index n is expressed by a quadratic function of the distance r.
  • the refractive index of the Grin lens is rotationally symmetric about the central axis.
  • the light propagated in the fundamental mode of the optical fiber 11 and emitted from the core at the end face and diverged is converged while propagating substantially parallel to the Z direction inside, and deflected by the reflecting surface 13a in the middle of the convergence.
  • the light can be condensed in the vicinity of a certain point outside.
  • the Grin lens 13 that functions as a condensing optical system and a deflecting optical system is used.
  • both functions may be separated into different members. That is, the Grin lens 13 has an end surface orthogonal to the Z axis so as not to have the reflecting surface 13a, and has only a function as a condensing optical system. Then, a member having a function as a deflecting optical system such as a prism having the reflecting surface 13a on the end face may be fixed.
  • the metal pipe 17 has a slit SL formed by cutting out from the end in the Z direction.
  • the sheath 18 and the mold part 19 are made of a material that transmits the observation light L propagating through the optical fiber 11. Thereby, the observation light L propagating through the optical fiber 11 is condensed by the Grin lens 13 and deflected in the Y direction by the reflecting surface 13a, and then the distal end through the internal space SP, the slit SL, and the sheath 18. It enters the object 3 existing on the side of 10b.
  • the angle ⁇ formed by the reflecting surface 13a with respect to the central axis is preferably set to 20 ° or more and less than 45 ° so that the observation light L is emitted with a slight inclination in the Z direction with respect to the Y direction.
  • the fluorescent probe 10 can rotate the optical fiber 11 and the support tube 14 in the jacket tube 15 by rotating the optical connector 12. Further, the rotational torque of the support tube 14 and the optical fiber 11 is transmitted to the optical fiber 11 in the distal end 10 b via the optical fiber 11 held in the through hole of the handpiece 16. Therefore, by rotating the optical connector 12, the optical fiber 11 and the Grin lens 13 can be rotated around the Z axis in the metal tube 17 and the sheath 18 at the distal end 10b.
  • the optical probe 10 can rotate the optical fiber 11 in the metal tube 17 having the slit SL.
  • the observation light scanned onto the object on the side of the optical probe 10 is limited to the opening range R around the Z axis of the slit SL. Thereby, it can suppress that the observation light L is irradiated except the area
  • FIG. 5 is a YZ sectional view and an XY sectional view for explaining the optical path of the observation light L according to the comparative example
  • FIG. 6 is a YZ sectional view and an XY sectional view for explaining the optical path of the observation light L in this embodiment.
  • the present embodiment is different from the comparative example in that the mold unit 19 includes a compensation unit 19b.
  • the refractive index of the Grinn lens 13 is about 1.45
  • the refractive index of the mold part 19 is about 1.45
  • the refractive index of the internal space SP is about 1.00
  • the refractive index of the sheath 18 is about 1.64
  • the refractive index outside the optical probe 10 is about 1.30.
  • the inclination angle of the reflecting surface 13a is, for example, 35 °.
  • the observation light L is condensed while the beam diameter is enlarged in the process of propagating through the Grin lens 13, and the reflection surface 13a is slightly inclined from the Y direction to the Z direction. Deflected. Further, the light is emitted to the side of the distal end 10 b through the internal space SP, the slit SL, and the sheath 18. Since the Grin lens 13 and the mold part 19 have substantially the same refractive index, the observation light L is hardly refracted at the interface between them.
  • the interface between the mold part 19 and the internal space SP which is an interface having a large refractive index difference
  • the interface between the internal space SP and the sheath 18, and the interface between the sheath 18 and the outside of the optical probe 10 The light is emitted in a direction slightly inclined in the Z direction.
  • the fluorescent fiber 11 and the Grin lens are cylindrical, and the mold part 19 and the sheath 18 are cylindrical.
  • the sheath 18 extends along the Z direction, and has a curved surface portion 18a having a curvature in an XY cross section (a cross section orthogonal to the first direction).
  • the observation light L deflected by the reflecting surface 13a is emitted from the side of the distal end 10b by passing through the curved surface portion 18a. Therefore, in the YZ cross section, the interface between the mold part 19 and the internal space SP, the interface between the internal space SP and the sheath 18, and the interface between the sheath 18 and the outside of the optical probe 10 have no curvature.
  • the focal length dy in the Y direction may be different from the focal length dx in the X direction.
  • the observation light L of the comparative example is condensed at the cross-section arc-shaped interface between the mold portion 19 and the internal space SP, and is diverged at the cross-section arc-shaped interface between the internal space SP and the sheath 18.
  • Light is collected at the interface of the cross-section arc shape with the outside of the optical probe 10.
  • the condensing angle in the XY plane is larger than the condensing angle in the YZ plane, dy> dx
  • the beam shape of the observation light L at the focal position in the Y direction has a long axis in the Z direction. It has an ellipse.
  • the observation light L causes an optical aberration, which causes a reduction in the resolution of a tomographic image by OCT measurement.
  • the mold unit 19 includes a compensation unit 19b.
  • the compensation part 19b is a part including a part through which the observation light L is transmitted in the mold part 19, and the curvature of the compensation part 19b is made smaller than the curvature of the part other than the compensation part 19b.
  • the observation light L is gently condensed at the interface between the compensation unit 19b and the internal space SP in the XY plane, and is diverged at the cross-sectional arc-shaped interface between the internal space SP and the sheath 18, and the sheath 18 and the optical probe 10 is condensed at an interface having a circular arc cross section with the outside.
  • the shape of the compensation unit 19b is not limited to the spherical lens shape, and an aspheric lens shape may be adopted. Moreover, the part which has several different curvature may be included in the compensation part 19b.
  • the compensation unit 19b extends along the Z direction over a range including the glass fiber 11a exposed from the optical fiber 11 and the Grin lens 13. As shown in FIG. In the techniques described in Patent Documents 1 to 5, since a lens structure is provided in the deflecting optical system, there are problems that the processing of the deflecting optical system is costly and alignment with an optical fiber is difficult. By configuring the compensation portion as a structure provided over a wide range, the compensation portion 19b can be formed in the mold portion 19 by an easy processing method such as resin molding or glass capillary adhesion.
  • the optical fiber 11 and the Grin lens 13 are integrally formed by covering the outer periphery of the glass fiber 11a and the Grin lens 13 with the mold unit 19 including the compensation unit 19b.
  • the compensation unit 19b can be positioned with high accuracy with respect to the optical fiber 11 and the Grind lens 13.
  • the mold part 19 covers only the glass fiber 11a, the diameter of the mold part 19 can be prevented from increasing, and consequently the sheath 18 can be prevented from increasing in diameter.
  • the mold part 19 is formed of a glass capillary, the clearance between the optical fiber 11 or the Grind lens and the glass capillary can be reduced. Thereby, it becomes easy to arrange
  • FIG. 7 is an XY sectional view of the distal end 10b of the optical probe according to the modification of the present embodiment.
  • This modification is different from the above-described embodiment in that the mold part 19 includes a convex part 19a.
  • the convex portion 19 a is provided on a part of the mold portion 19 along the Z direction so as to protrude from the outer periphery toward the sheath 18.
  • the convex portion 19 a is preferably formed integrally with the same resin as the mold portion 19 when the mold portion 19 is provided on the outer periphery of the optical fiber 11 and the Grind lens 13.
  • the optical fiber 11 can be disposed at the center position of the sheath 18 by the ridges 19a. That is, when the optical fiber 11 is rotated in the sheath 18 when the optical fiber 11 is rotated about the Z axis, the convex portion 19a remains on the inner periphery of the sheath 18 (the inner periphery of the metal tube 17). ) To restrict the movement of the optical fiber 11. Therefore, the rotational torque can be efficiently transmitted to the deflection optical system.
  • a plurality of ridges 19a are preferably provided in a cross section perpendicular to the axis of the mold part 19.
  • four ridges 19a are provided at intervals of 90 ° or three at intervals of 120 ° in the circumferential direction.
  • it is preferable that a plurality are provided along the Z direction.
  • the optical fiber 11 and the Grind lens 13 can be easily arranged at the center position of the cylindrical sheath 18 by making the heights of the convex portions 19a equal.
  • the height of the convex portion 19 a is preferably set so that the top portion is higher than the coating 11 b and has a slight clearance between the inner diameter of the molded metal tube 17.
  • FIG. 8 is a diagram for explaining an example of a method of manufacturing an optical probe according to the present invention, in which an optical fiber and a Grin lens arranged in a mold are moved in the first direction from the tip of the optical fiber 11 (Grin lens 13). It is the front view seen along (Z direction).
  • a mold part 19 covering a part of the optical fiber or the condensing optical system and the deflection optical system includes a first mold part 19c including a part (compensation part 19b) extending in the first direction and transmitting observation light,
  • a part and the Grin lens 13 are arranged, and a resin is filled into the space around the lens and cured. After that, by removing from the mold, it is possible to obtain the one in which the compensation portion is formed so as to integrally cover a part of the optical fiber 11 and the periphery of the Grin lens 13.
  • the resin is preferably an ultraviolet curable resin, but is not limited thereto. In the method of manufacturing the optical probe according to this example, a discontinuous point is not formed in the compensation unit, and an optical probe that can accurately measure the observation light can be obtained.
  • the size of the compensation unit 19b must be reduced accordingly.
  • the compensation unit 19b by changing the position where the two molds are separated.
  • a line segment connecting the boundary between the first mold part 19c and the second mold part 19d is the optical fiber 11 (Grin) in this cross section.
  • the center of the optical fiber is on the second mold part side of the boundary surface between the first mold part and the second mold part in the cross section orthogonal to the first direction.
  • the compensation part 19b The size (corresponding to the width in the X direction in FIG. 9) can be further increased.
  • the first mold 20a and the second mold 20b are symmetrical with respect to an axis that passes through the center position of the optical fiber 11 (Grin lens 13) and is parallel to the Y axis.
  • the division surface 19e is set, the present invention is not limited to this, and it is sufficient that the division surface does not even cross the compensation unit 19b.
  • the mold for forming the second mold part 19d that does not include the compensation part 19b does not need to be formed as one mold, and may be further divided into two or more.
  • FIG. 10 is a front view of another optical probe viewed along the first direction (Z direction).
  • the difference from the example of FIG. 9 is that a step 19f is formed at the boundary between the first mold part 19c and the second mold part 19d on the outer surface of the compensation part. This step extends along the first direction (Z direction).
  • the oblique surface of the tip of the optical fiber 11 (Grin lens 13) (for example, the portion 13a in FIG. 6) requires high angular accuracy, and therefore measurement of whether a desired angle is obtained. (Inspection) itself is required to be performed with high accuracy. In order to measure with high accuracy, it is important that the reference plane and the reference line that are marks when observed from the outside are easily detected.
  • Such a step is preferably 5 ⁇ m to 30 ⁇ m on one side. This is because if it is too large, the thickness of the second mold part 19d will be too thin as a result, and if it is too small, it will be difficult to recognize it as the reference position.

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  • Optical Couplings Of Light Guides (AREA)

Abstract

L'invention concerne une sonde optique qui peut être facilement fabriquée et qui peut obtenir des images tomographiques de haute résolution, qui comporte une extrémité proximale raccordée à un dispositif de tomographie en cohérence optique (OCT pour Optical Coherence Tomography) et une extrémité distale destinée à émettre une lumière d'observation, et qui comporte en outre : une fibre optique ; une lentille à gradient d'indice (GRIN pour GRaded INdex) qui fait office de système optique de collecte de lumière et de système optique de déflexion et qui est raccordée optiquement à la fibre optique au niveau de l'extrémité distale ; une gaine qui comporte une section de surface incurvée s'étendant dans une première direction et présentant une courbure dans une section transversale perpendiculaire à la première direction, contient la fibre optique et la lentille à gradient GRIN dans la première direction, et émet latéralement la lumière d'observation déviée à travers la section de surface incurvée ; et une unité de compensation qui est contenue dans la gaine, s'étend dans la première direction à travers une plage comprenant la lentille à gradient GRIN et une partie de la fibre optique, et compense l'aberration optique produite lors de la transmission de la lumière d'observation à travers la section de surface incurvée.
PCT/JP2016/061648 2015-04-16 2016-04-11 Sonde optique WO2016167204A1 (fr)

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EP16779995.6A EP3284387A4 (fr) 2015-04-16 2016-04-11 Sonde optique
US15/566,148 US20180087893A1 (en) 2015-04-16 2016-04-11 Optical probe

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JP2015083897 2015-04-16
JP2015-083897 2015-04-16
JP2015155591A JP2016202866A (ja) 2015-04-16 2015-08-06 光プローブ
JP2015-155591 2015-08-06

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2022209995A1 (fr) * 2021-03-30 2022-10-06 古河電気工業株式会社 Système de sonde d'irradiation et sonde d'irradiation

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JP2000262461A (ja) * 1999-02-04 2000-09-26 Univ Hospital Of Cleveland 光イメージング装置
JP2008067889A (ja) * 2006-09-14 2008-03-27 Pentax Corp リニア走査式内視鏡用オプティカルコヒーレンストモグラフィプローブ
JP2009510451A (ja) * 2005-09-29 2009-03-12 ザ ジェネラル ホスピタル コーポレイション スペクトル符号化による光学イメージング方法および装置
JP2012229976A (ja) * 2011-04-26 2012-11-22 Hoya Corp 光走査型プローブ
JP2013202295A (ja) * 2012-03-29 2013-10-07 Sumitomo Electric Ind Ltd 光プローブ
US20130266259A1 (en) * 2012-03-28 2013-10-10 Corning Incorporated Monolithic beam-shaping optical systems and methods for an oct probe

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JP2000262461A (ja) * 1999-02-04 2000-09-26 Univ Hospital Of Cleveland 光イメージング装置
JP2009510451A (ja) * 2005-09-29 2009-03-12 ザ ジェネラル ホスピタル コーポレイション スペクトル符号化による光学イメージング方法および装置
JP2008067889A (ja) * 2006-09-14 2008-03-27 Pentax Corp リニア走査式内視鏡用オプティカルコヒーレンストモグラフィプローブ
JP2012229976A (ja) * 2011-04-26 2012-11-22 Hoya Corp 光走査型プローブ
US20130266259A1 (en) * 2012-03-28 2013-10-10 Corning Incorporated Monolithic beam-shaping optical systems and methods for an oct probe
JP2013202295A (ja) * 2012-03-29 2013-10-07 Sumitomo Electric Ind Ltd 光プローブ

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See also references of EP3284387A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022209995A1 (fr) * 2021-03-30 2022-10-06 古河電気工業株式会社 Système de sonde d'irradiation et sonde d'irradiation

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