[go: up one dir, main page]

WO2020021658A1 - Dispositif de projection de lumière et procédé de projection de lumière - Google Patents

Dispositif de projection de lumière et procédé de projection de lumière Download PDF

Info

Publication number
WO2020021658A1
WO2020021658A1 PCT/JP2018/027921 JP2018027921W WO2020021658A1 WO 2020021658 A1 WO2020021658 A1 WO 2020021658A1 JP 2018027921 W JP2018027921 W JP 2018027921W WO 2020021658 A1 WO2020021658 A1 WO 2020021658A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical fiber
spot
tip
scanning
scanning unit
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/JP2018/027921
Other languages
English (en)
Japanese (ja)
Inventor
啓一朗 中島
雙木　満
福島　郁俊
健寛 三木
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
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 Olympus Corp filed Critical Olympus Corp
Priority to PCT/JP2018/027921 priority Critical patent/WO2020021658A1/fr
Publication of WO2020021658A1 publication Critical patent/WO2020021658A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems

Definitions

  • the present invention relates to a light projection device and a light projection method.
  • Patent Document 1 the light emitted from the tip of the optical fiber is applied to the subject via a lens. Therefore, the light emitted to the subject has aberrations such as field curvature caused by the lens. Diagnosis or treatment requires a sharp endoscopic image of a subject, and for that purpose, it is necessary to correct aberrations according to the shape of the subject surface. However, Patent Literature 1 has a problem that it is not possible to appropriately correct aberrations, particularly curvature of field.
  • the present invention has been made in view of the above circumstances, and provides an optical projection device and an optical projection method that can correct aberration of illumination light for illuminating an object according to the shape of the object surface. Aim.
  • One embodiment of the present invention is a light source unit that emits laser light, an optical fiber that guides the laser light emitted from the light source unit, and emits light from the tip, and a tip part of the optical fiber in a cantilever shape.
  • a second scanning unit that linearly scans the scanning unit in a direction along the optical axis of the optical fiber in the support unit, and controls the first scanning unit and the second scanning unit in
  • Another aspect of the present invention is a light projection method for converging laser light emitted from a tip of an optical fiber and projecting a spot of the laser light on a subject, wherein the tip of the optical fiber is cantilevered. Spirally oscillating the tip of the optical fiber around the optical axis of the optical fiber in the support portion supporting the spot in a spiral manner, thereby spirally scanning the spot, and linearly scanning the spot in a direction along the optical axis. And performing the spiral scanning step and the linear scanning step in synchronization with each other to linearly scan the spot during one cycle of the spiral scanning.
  • the aberration of the illumination light for illuminating the subject can be corrected according to the shape of the subject surface.
  • FIG. 1 is an overall configuration diagram of an optical projection device according to an embodiment of the present invention.
  • FIG. 2 is a diagram illustrating a configuration example of a first scanning unit in the optical projection device in FIG. 1.
  • FIG. 5 is a diagram illustrating a scanning locus of an intermediate spot when the movable lens is stationary.
  • FIG. 7 is a diagram illustrating a scanning locus of an intermediate spot when the movable lens is moving. It is a figure explaining the positional relationship of a movable lens and an intermediate spot, and is a figure showing the state where a movable lens is arranged at a reference position.
  • FIG. 4B is a diagram illustrating a state where the movable lens is displaced from the reference position in FIG. 4A to the ⁇ Z side.
  • FIG. 4B is a diagram illustrating a state where the movable lens is displaced from the reference position in FIG. 4A to the ⁇ Z side.
  • FIG. 4B is a diagram illustrating a state where the movable lens has been displaced from the reference position in FIG. 4A to the + Z side.
  • FIG. 7 is a diagram illustrating a change in an image plane of the relay lens and the objective lens when the movable lens is stationary.
  • FIG. 7 is a diagram illustrating a change in an image plane of the relay lens and the objective lens when the movable lens is moving.
  • 2 is a timing chart illustrating an operation of the light projection device in FIG. 1.
  • FIG. 3 is a diagram illustrating a non-corrected image plane and a target image plane on the surface of a subject.
  • FIG. 7 is a diagram illustrating a specific example of a second drive signal.
  • FIG. 9 is a diagram showing an intermediate image plane formed based on a second drive signal S21 of FIG.
  • FIG. 9 is a diagram showing an intermediate image plane formed based on a second drive signal S22 in FIG.
  • FIG. 9 is a diagram showing an intermediate image plane formed based on a second drive signal S23 in FIG.
  • FIG. 9 is a diagram illustrating an example of a change in a second drive signal due to a user I / F.
  • FIG. 9 is a diagram illustrating an example of a change in an intermediate image plane due to a user I / F.
  • FIG. 11 is a diagram illustrating another example of the target image plane.
  • FIG. 11 is a diagram illustrating another example of the target image plane.
  • FIG. 11 is a diagram illustrating another example of the target image plane.
  • FIG. 9 is a diagram illustrating a positional relationship between a movable element and an intermediate spot in a modification of the light projection device in FIG.
  • FIG. 13B is a diagram showing a state where the intermediate spot is displaced to the ⁇ Z side due to displacement of the movable element from the reference position in FIG. 13A.
  • FIG. 13B is a diagram illustrating a state where the movable element is displaced to the intermediate spot + Z side by the displacement of the movable element from the reference position in FIG. 13A.
  • FIG. 13 is a diagram illustrating a positional relationship between a movable lens and an intermediate spot in another modification of the light projection device in FIG. 1, and is a diagram illustrating a state where a movable element is arranged at a reference position.
  • FIG. 13 is a diagram showing a state where a movable element is arranged at a reference position.
  • FIG. 14B is a diagram showing a state where the intermediate spot has been displaced to the ⁇ Z side due to displacement of the movable element from the reference position in FIG. 14A.
  • FIG. 14B is a diagram showing a state in which the intermediate spot has been displaced to the + Z side by displacement of the movable element from the reference position in FIG. 14A.
  • FIG. 13 is a diagram illustrating a positional relationship between a movable lens and an intermediate spot in another modification of the light projection device in FIG. 1, and is a diagram illustrating a state where a movable element is arranged at a reference position.
  • FIG. 15B is a diagram illustrating a state in which the intermediate spot has been displaced to the ⁇ Z side due to displacement of the movable element from the reference position in FIG. 15A.
  • FIG. 15B is a diagram showing a state in which the intermediate spot has been displaced to the + Z side by displacement of the movable element from the reference position in FIG. 15A.
  • the optical projection device 1 is built in an endoscope 100 as shown in FIG.
  • the endoscope 100 includes a hard and long scope 20, a handle 30 connected to a base end of the scope 20, and a controller 40.
  • the light projection device 1 includes a light source unit 2, a long optical fiber 3, an imaging optical system 4, a first scanning unit 5, a second scanning unit 6, and a control unit 7. .
  • the light source unit 2, the optical fiber 3, and the imaging optical system 4 are arranged in this order from the base end side of the endoscope 100 to the distal end side.
  • the light source unit 2 is provided in the handle 30 and includes a laser light source such as a laser diode.
  • the laser light L emitted from the laser light source enters the base end of the optical fiber 3.
  • the optical fiber 3 is disposed in the handle 30, and the base end of the optical fiber 3 is connected to the light source 2.
  • the optical fiber 3 guides the laser light L from the light source unit 2 from the base end to the distal end 3a, and emits the laser light L from the distal end 3a.
  • the distal end of the optical fiber 3 is supported in a cantilever shape by a support 5a of a first scanning unit 5 described later.
  • the optical axis of the optical fiber 3 in the support portion 5a is defined as "optical axis A", and an XYZ orthogonal coordinate system having the optical axis A as the Z axis is used.
  • the + Z direction is the traveling direction of the laser light L (forward of the optical axis A), and the -Z direction is the direction opposite to the traveling direction of the laser light L (back of the optical axis A).
  • the X axis and the Y axis are orthogonal to the optical axis A and mutually orthogonal.
  • illustration of the support part 5a is abbreviate
  • the imaging optical system 4 has the same optical axis as the optical axis A.
  • the imaging optical system 4 condenses the laser light L emitted from the tip 3a of the optical fiber 3, and projects the spot P1 of the laser light L on the subject B.
  • the imaging optical system 4 includes a light-collecting optical system 8 provided in a handle 30, and a relay lens 9 and an objective lens 10 provided in a scope 20.
  • the focusing optical system 8 is disposed between the distal end 3a of the optical fiber 3 and the relay lens 9, and focuses the laser light L from the distal end 3a on the base end 9a of the relay lens 9 or near the base end 9a.
  • the condensing optical system 8 includes a pair of lenses 8a and 8b.
  • the lens 8a on the side of the optical fiber 3 forms the laser beam L emitted from the tip 3a of the optical fiber 3 into parallel light.
  • the lens 8b on the side of the relay lens 9 has a focal point F2 at or near the proximal end 9a of the relay lens 9.
  • the lens 8b focuses the laser beam L on the focal point F2 and forms an intermediate spot P2 on the focal point F2.
  • the relay lens 9 is a long gradient index (GRIN) lens disposed along the longitudinal direction of the scope 20.
  • the relay lens 9 relays the laser light L that has entered the base end 9a from the focusing optical system 8.
  • the objective lens 10 is a short GRIN lens arranged along the longitudinal direction of the scope 20, and is arranged at the tip of the scope 20.
  • the objective lens 10 is joined to the tip of the relay lens 9, focuses the laser light L emitted from the tip of the relay lens 9, and projects the spot P 1 of the laser light L on the subject B.
  • the lens 8b is a movable lens that can move along the optical axis A with respect to the scope 20 and the handle 30.
  • the movement of the lens 8b causes the focal point F2 and the intermediate spot P2 to move linearly in the direction along the optical axis A.
  • the lenses 8a, 9, and 10 other than the movable lens 8b are fixed to the scope 20 and the handle 30.
  • the optical fiber 3 is also fixed to the scope 20 and the handle 30 except for the tip portion vibrated by the first scanning unit 5.
  • the first scanning unit 5 moves the tip 3a of the optical fiber 3 around the optical axis A in a spiral shape in the XY plane in accordance with the first drive signals S1_X and S1_Y (see FIG. 6) from the control unit 7. Spiral vibration along the vibration trajectory. Thereby, the laser light L emitted from the tip 3a is spirally scanned along a spiral scanning trajectory around the optical axis A, and the intermediate spot P2 and the spot P1 are also rotated around the optical axis A as shown in FIG. Is scanned spirally.
  • FIG. 3A shows a scanning trajectory of the intermediate spot P2.
  • the first scanning unit 5 forms an uncorrected image plane I1 (see FIG. 5A) by spirally scanning the spot P1 with the movable lens 8b stationary at a predetermined reference position.
  • FIG. 2 is a front view of the optical fiber 3 and the first scanning unit 5 as viewed in the ⁇ Z direction, and shows a configuration example of the first scanning unit 5.
  • the first scanning unit 5 is a piezoelectric actuator including a ferrule 11 and piezoelectric elements 12X and 12Y.
  • the ferrule 11 is a quadrangular cylindrical member having elasticity.
  • the ferrule 11 is fixed to the outer peripheral surface of the optical fiber 3 at a position spaced from the distal end 3a toward the proximal end.
  • a support 5 a is fixed to the base end of the ferrule 11, and the support 5 a is fixed to the handle 30.
  • the distal end of the optical fiber 3 is supported in a cantilever shape by the support portion 5a.
  • Plate-shaped piezoelectric elements 12X and 12Y are fixed to each of the four outer peripheral surfaces of the ferrule 11.
  • the two piezoelectric elements 12X facing each other in the X direction expand and contract in the Z direction according to the first drive signal S1_X for the X direction, thereby causing the distal end portion of the optical fiber 3 to bend and vibrate, thereby causing the distal end 3a to move in the X direction.
  • the two piezoelectric elements 12Y opposed to each other in the Y direction expand and contract and vibrate in the Z direction according to the first drive signal S1_Y for the Y direction, thereby causing the distal end of the optical fiber 3 to bend and vibrate, thereby causing the distal end 3a to move in the Y direction.
  • the phase of the drive signal S1_X and the phase of the drive signal S1_Y are shifted from each other by ⁇ / 2, whereby the tip 3a is caused to spirally vibrate.
  • the first scanning unit 5 may be another type of actuator.
  • the first scanning unit 5 is an electromagnetic actuator including a cylindrical permanent magnet magnetically attached in the longitudinal direction and having magnetic poles at both ends, and an electromagnetic coil provided at a position facing each magnetic pole of the permanent magnet. It may be.
  • the optical fiber 3 is inserted into the permanent magnet so as to protrude from the permanent magnet, and the permanent magnet is fixed to the outer peripheral surface of the optical fiber 3.
  • the electromagnetic coil When a current is supplied from the control unit 7 to the electromagnetic coil, the electromagnetic coil generates a magnetic field near the magnetic pole of the permanent magnet, the permanent magnet vibrates, and the optical fiber 3 vibrates.
  • FIG. 4A shows a state where the lens 8b is arranged at a reference position where the intermediate spot P2 coincides with the base end 9a of the relay lens 9.
  • FIG. 4B shows a state where the lens 8b is displaced in the ⁇ Z direction from the reference position.
  • FIG. 4C shows a state where the lens 8b is displaced in the + Z direction from the reference position.
  • the second scanning section 6 has a fixed section 6a fixed to the handle 30 and a movable section 6b fixed to the lens 8b, and the movable section 6b moves in the direction along the optical axis A with respect to the fixed section 6a. Can be moved.
  • a second scanning unit 6 is an arbitrary element that can move the lens 8b in one axis direction.
  • the second scanning unit 6 includes a piezo actuator or a voice coil motor.
  • FIG. 5A shows the relationship between the image plane I2 formed by the scanned intermediate spot P2 and the field curvature generated in the relay lens 9 and the objective lens 10.
  • An intermediate image plane I2 is formed at or near the base end 9a of the relay lens 9.
  • the intermediate image plane I2 is a plane on which the intermediate spot P2 is scanned by the first and second scanning units 5, 6.
  • the intermediate image plane I2 becomes a flat plane perpendicular to the optical axis A, as shown in FIGS. 3A and 5A.
  • An image transmitted through the relay lens 9 and the objective lens 10, which are GRIN lenses, is gradually added with field curvature.
  • the image surface I3 at the tip of the objective lens 10 is a curved surface that is convex on the + Z side (subject B side), and the image surface formed by the scanned spot P1 (non- The (corrected image plane) I1 also becomes a curved surface convex on the + Z side.
  • the non-corrected image plane I1 is a plane on which the spot P1 is scanned by the first scanning unit 5 in a state where the lens 8b is stationary at the reference position.
  • the control unit 7 generates the first drive signals S1_X, S1_Y and the second drive signal S2, as shown in FIG.
  • the control unit 7 supplies the first drive signals S1_X and S1_Y to the first scanning unit 5, and supplies the second drive signal S2 to the second scanning unit 6.
  • the first drive signals S1_X and S1_Y are vibration waves whose amplitude envelopes change with time in a constant cycle T in a sinusoidal manner.
  • the amplitudes of the first drive signals S1_X and S1_Y correspond to the vibration amplitudes of the tip 3a of the optical fiber 3 in the X and Y directions.
  • the first scanning unit 5 spirally scans the spots P1 and P2 radially outward during the first period ⁇ t1 in accordance with the first drive signals S1_X and S1_Y, and performs the first period ⁇ t1.
  • the spots P1 and P2 are spirally scanned radially inward.
  • the second drive signal S2 is a triangular wave or a sine wave.
  • the magnitude of the second drive signal S2 corresponds to the amount of movement of the lens 8b in the + Z direction from the initial position.
  • the initial position is a position where the intermediate spot P2 is separated from the base end 9a in the ⁇ Z direction.
  • the second drive signal S2 has the same cycle T as the cycle T of the first drive signals S1_X and S1_Y.
  • the control unit 7 controls the first scanning unit 5 and the second scanning unit 6 in synchronization by synchronizing the first driving signals S1_X and S1_Y with the second driving signal S2. At this time, based on the difference between the non-corrected image plane I1 and the target image plane I1 ', the control unit 7 moves the spot P1 spirally scanned by the first scanning unit 5 from the position on the non-corrected image plane I1 to the target.
  • the moving direction and the moving amount of the movable lens 8b are controlled by the second drive signal S2 so as to be displaced to the position on the image plane I1 ', whereby the uncorrected image plane I1 is corrected to the target image plane I1'. .
  • the target image plane I1 ' is, for example, a plane set in the control unit 7 by a user. This makes it possible to control the image plane on which the spot P1 is scanned to a surface having an arbitrary shape, and to correct the aberration of the illumination light, particularly the curvature of field, according to the shape of the surface of the subject B.
  • the moving direction and the moving amount of the lens 8b are calculated from the difference between the known shape of the uncorrected image plane I1 and the shape of the target image plane I1 '.
  • the moving direction and the moving amount of the lens 8b may be stored in a storage device (not shown) in advance.
  • the control unit 7 sets the amplitudes of the first drive signals S1_X and S1_Y and the amplitude of the second drive signal S2 at the same time, as shown in FIG.
  • the first drive signals S1_X, S1_Y and the second drive signal S2 are synchronized so that they become maximum and become minimum at the same time.
  • the second scanning unit 6 moves the movable lens 8b in a direction approaching the base end 9a.
  • the second scanning unit 6 moves the movable lens 8b in a direction away from the base end 9a.
  • the intermediate image plane I2 becomes a curved surface or a conical surface that is convex on the ⁇ Z side, and the curvature of field caused by the lenses 9 and 10 is canceled by the curvature of the intermediate image plane I2.
  • the non-corrected image plane I1 is corrected to a flat target image plane I1 '. In this manner, the non-corrected image plane I1 convex toward the subject B is corrected to a flat surface without using a lens having a negative refractive power.
  • the control unit 7 includes, for example, a processor, a storage device, a signal generator, and a digital-to-analog (DA) converter (all not shown) incorporated in the controller 40.
  • the processor is, for example, a central processing unit, and generates a control signal according to a control program stored in a storage device.
  • the control signal is a signal that defines parameters such as frequency, amplitude, and phase of each of the drive signals S1_X, S1_Y, and S2.
  • the signal generator generates a digital waveform according to the control signal.
  • the DA converter generates drive signals S1_X, S1_Y, and S2, which are analog signals, by performing DA conversion on the digital waveform.
  • the laser light L emitted from the light source unit 2 guides the inside of the optical fiber 3, is emitted from the tip 3 a of the optical fiber 3, and The light enters the relay lens 9 via the relay lens 9, is relayed by the relay lens 9, and is focused on the subject B by the objective lens 10.
  • the spot P1 of the laser beam L formed on the subject B is spirally scanned around the optical axis A by causing the first scanning section 5 to spirally vibrate the tip 3a of the optical fiber 3.
  • the spot P1 is linearly scanned in the direction along the optical axis A by the lens 8b being linearly moved by the second scanning unit 6.
  • the spiral scanning by the first scanning unit 5 and the linear scanning by the second scanning unit 6 are executed by the control unit 7 in synchronization with each other so that the spot P1 is linearly scanned during one period of the spiral scanning.
  • the non-corrected image plane I1 of the laser beam L illuminating the subject B is corrected to a flat target image plane I1 '. Therefore, it is possible to scan a flat or less uneven surface of the subject B with the small spot P1 of the laser beam L.
  • signal light such as fluorescence or reflected light of the laser light L is generated.
  • the signal light is detected by a detection optical system (not shown) provided in the scope 20, and information on the intensity of the signal light is transmitted from the detection optical system to the controller 40.
  • an image of the subject B is generated by associating the intensity of the signal light with the position of the spot P1 on the scanning trajectory.
  • FIG. 6 shows an example in which an image of the subject B is acquired on the outward path of the spiral scan.
  • the control unit 7 generates a pulse signal as a photographing trigger at a timing when the drive signals S1_X, S1_Y, and S2 are maximized.
  • the detection optical system detects the signal light over an imaging period of a predetermined length in response to the imaging trigger.
  • FIG. 7 shows the relationship between the shape of the surface of the subject B and the shapes of the image planes I1 and I1 '.
  • the spot diameter of the laser beam L on the surface of the subject B increases, and as a result, , The image is blurred. Image blur becomes more remarkable as the deviation ⁇ between the uncorrected image plane I1 and the surface of the subject B increases.
  • the non-corrected image plane I1 is corrected to a flat target image plane I1 'according to the surface shape of the subject B that is flat or has little unevenness. Therefore, there is an advantage that an image in which the entire surface of the subject B is in focus can be obtained.
  • the large curvature of field generated by the GRIN lenses 9 and 10 can be easily corrected by simple means simply moving the lens 8b other than the GRIN lenses 9 and 10 linearly.
  • the non-corrected image plane I1 has a spread of 0.26 mm in the direction along the optical axis A due to field curvature. Even such a large curvature of field, which is difficult to correct using the refractive power of the lens, can be easily corrected by moving the movable lens 8b.
  • the tip 3a of the optical fiber 3 has a vibration period of about 0.1 ms. Is required.
  • the lens 8b only needs to make one reciprocation within 16.7 ms. It is easy to realize such mechanical movement of the lens 8b.
  • the curvature of field caused by the INGRIN lenses 9 and 10 can also be corrected by arranging a concave lens having a negative refractive power at the distal end of the scope 20.
  • a concave lens having a negative refractive power at the distal end of the scope 20.
  • FIG. 8 shows a specific example of the second drive signal S2
  • FIGS. 9A to 9C show specific examples of the scanning trajectory of the intermediate spot P2, that is, the intermediate image plane I2.
  • a second drive signal S21 for moving the lens 8b at a constant speed a second drive signal S22 for gradually increasing the movement speed of the lens 8b, and a second drive signal S22 for gradually decreasing the movement speed of the lens 8b.
  • the drive signal S23 is shown.
  • the intermediate image plane I2 formed according to the second drive signal S21 has a conical shape as shown in FIG. 9A.
  • the intermediate image plane I2 formed according to the second drive signal S22 has a substantially conical shape with a concave side surface.
  • the intermediate image plane I2 formed in accordance with the second drive signal S23 has a substantially conical shape with a convex side surface, as shown in FIG. 9C.
  • the specific waveform shape of the second drive signal S2 can be variously set according to the curvature of field generated by the lenses 9 and 10.
  • the user wants to change the target image plane I1 'while observing the subject B.
  • the shape of the surface of the subject B in the observation range may differ depending on the position in the body cavity.
  • a user interface (I / F) 13 for the user to change the shape of the intermediate image plane I2 may be provided.
  • the user I / F 13 may be provided in the controller 40.
  • the user I / F 13 is a dial provided on the handle 30.
  • the second drive signal S2 can be continuously changed between two patterns 1 and 2 having different amplitudes by the operation of the user I / F 13 by the user, as shown in FIG.
  • the size of the intermediate image plane I2 in the direction along the optical axis A is changed according to the change in the amplitude of the second drive signal S2.
  • the user I / F 13 may be configured to be able to change the moving speed of the movable lens 8b.
  • the target image plane I1 ' is not limited to a flat surface, but can be set to an arbitrary shape according to the shape of the surface of the subject B.
  • 12A and 12B show another example of the target image plane I1 '.
  • the target image plane I1 ′ shown in FIG. 12A is a curved surface that is larger on the + Z side and has a larger curvature than the uncorrected image plane I1.
  • Such a target image plane I1 ' is advantageous in that, for example, when observing a narrow cavity, it is possible to obtain an image whose focus is not only on the front but also on the inner surface of the cavity.
  • control unit 7 moves the movable lens 8b in the direction away from the base end 9a by the second scanning unit 6 during the first period ⁇ t1 in order to form the intermediate image plane I2 convex on the + Z side. Then, the movable lens 8b is moved by the second scanning unit 6 in a direction approaching the base end 9a during the second period ⁇ t2.
  • the target image plane I1 ′ shown in FIG. 12B is a curved surface that is convex on the ⁇ Z side.
  • a target image plane I1 ' is advantageous in that, for example, when observing the surface of the raised subject B, the entire subject B can be observed without blurring.
  • the control section 7 moves the lens 8b by the second scanning section 6 so that the intermediate image plane I2 is further convexed on the ⁇ Z side than the intermediate image plane I2 shown in FIG. 5B.
  • the movable element moved by the second scanning unit 6 is only one lens 8b, but the movable element can move the intermediate spot P2 along the optical axis A.
  • the second scanning unit 6 supports the condensing optical system 8 and the first scanning unit 5.
  • the second scanning unit 6 moves the light collecting optical system 8 and the distal end of the optical fiber 3 integrally along the optical axis A while maintaining the relative positions of the light collecting optical system 8 and the distal end of the optical fiber 3. Move.
  • the tip of the optical fiber 3 is a movable element.
  • the second scanning unit 6 supports the first scanning unit 5 and moves the first scanning unit 5 and the distal end of the optical fiber 3 integrally along the optical axis A.
  • the intermediate spot P2 moves to the + Z side. Therefore, when forming the intermediate image plane I2 convex on the ⁇ Z side, the control unit 7 controls the second scanning unit 6 to move the distal end of the optical fiber 3 closer to the base end 9a during the first period ⁇ t1.
  • the second scanning unit 6 moves the distal end of the optical fiber 3 away from the base end 9a during the second period ⁇ t2.
  • the second scanning unit 6 supports the lens 8a and the first scanning unit 5.
  • the second scanning unit 6 moves the tip of the lens 8a and the tip of the optical fiber 3 along the optical axis A in a direction in which the lens 8a approaches and separates from each other, and moves between the tip 3a of the optical fiber 3 and the lens 8a. Change the distance.
  • the second scanning unit 6 is an element such as a piezo actuator that can expand and contract in the direction along the optical axis A.
  • the second scanning unit 6 may include two elements that respectively move the first scanning unit 5 and the lens 8a.
  • the control unit 7 moves the distal end of the optical fiber 3 to the + Z side by the second scanning unit 6 during the first period ⁇ t1.
  • the lens 8a is moved to the ⁇ Z side, and the tip of the optical fiber 3 is moved to the ⁇ Z side and the lens 8a is moved to the + Z side by the second scanning unit 6 during the second period ⁇ t2.
  • the condensing optical system 8 is an optical system including a pair of lenses.
  • the specific configuration of the condensing optical system 8 is not limited to this, and a combination of three or more lenses is used.
  • the lens as the movable element does not necessarily need to be a lens located at the end of the condensing optical system 8, and the position of the lens as the movable element can be freely selected by the practitioner of the present invention. .
  • Objective lens imaging optical system, gradient index lens
  • Ferrule Ferrule
  • User interface 20 Scope 30 Handle 40 Controller 100 Endoscope A Optical axis B Subject I1 Uncorrected image plane I1 'Target image plane I2 Intermediate image plane P1 Spot P2 Intermediate spot

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Optics & Photonics (AREA)
  • Surgery (AREA)
  • General Physics & Mathematics (AREA)
  • Biomedical Technology (AREA)
  • General Health & Medical Sciences (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Radiology & Medical Imaging (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Biophysics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Mechanical Optical Scanning Systems (AREA)
  • Endoscopes (AREA)
  • Instruments For Viewing The Inside Of Hollow Bodies (AREA)

Abstract

L'invention concerne un dispositif de projection de lumière (1) équipé : d'une source de lumière (2) ; d'une fibre optique (3) pour projeter un faisceau laser (L) à partir de la source de lumière (2) à travers la pointe (3a) de la fibre optique (3) ; d'une première unité de balayage (5) pour balayer en spirale le point (P1) du faisceau laser (L) sur un sujet d'imagerie (B) en faisant osciller en spirale la pointe (3a) ; d'un système optique de formation d'image (4) pour projeter le point (P1) du faisceau laser (L) à partir de la pointe (3a) sur le sujet d'imagerie (B) ; d'une seconde unité de balayage (6) pour balayer linéairement le point (P1) dans une direction le long de l'axe optique (A) en déplaçant au moins une partie du système optique de formation d'image (4) et la pointe de la fibre optique (3) dans une direction le long de l'axe optique (A) ; et d'une unité de commande (7) pour amener le point (P1) à balayer linéairement pendant une période de balayage en spirale en commandant les première et seconde unités de balayage (5, 6) d'une manière synchronisée.
PCT/JP2018/027921 2018-07-25 2018-07-25 Dispositif de projection de lumière et procédé de projection de lumière Ceased WO2020021658A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2018/027921 WO2020021658A1 (fr) 2018-07-25 2018-07-25 Dispositif de projection de lumière et procédé de projection de lumière

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2018/027921 WO2020021658A1 (fr) 2018-07-25 2018-07-25 Dispositif de projection de lumière et procédé de projection de lumière

Publications (1)

Publication Number Publication Date
WO2020021658A1 true WO2020021658A1 (fr) 2020-01-30

Family

ID=69180922

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/027921 Ceased WO2020021658A1 (fr) 2018-07-25 2018-07-25 Dispositif de projection de lumière et procédé de projection de lumière

Country Status (1)

Country Link
WO (1) WO2020021658A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114384692A (zh) * 2020-10-21 2022-04-22 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

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010213764A (ja) * 2009-03-13 2010-09-30 Hoya Corp 医療用プローブ、及び医療用観察システム
US20160014383A1 (en) * 2008-05-19 2016-01-14 University Of Washington Scanning laser projection display for small handheld devices
WO2016103793A1 (fr) * 2014-12-25 2016-06-30 オリンパス株式会社 Endoscope à balayage
JP2017176471A (ja) * 2016-03-30 2017-10-05 オリンパス株式会社 内視鏡プロセッサ及び内視鏡プロセッサを有する観察システム

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160014383A1 (en) * 2008-05-19 2016-01-14 University Of Washington Scanning laser projection display for small handheld devices
JP2010213764A (ja) * 2009-03-13 2010-09-30 Hoya Corp 医療用プローブ、及び医療用観察システム
WO2016103793A1 (fr) * 2014-12-25 2016-06-30 オリンパス株式会社 Endoscope à balayage
JP2017176471A (ja) * 2016-03-30 2017-10-05 オリンパス株式会社 内視鏡プロセッサ及び内視鏡プロセッサを有する観察システム

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114384692A (zh) * 2020-10-21 2022-04-22 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

Similar Documents

Publication Publication Date Title
JP6270830B2 (ja) 光走査ユニット、光走査型観察装置、および光ファイバ走査装置
JP6274949B2 (ja) 光ファイバスキャナ、照明装置および観察装置
JP6438221B2 (ja) 光走査用アクチュエータおよび光走査装置
CN107407802B (zh) 光扫描装置的驱动条件设定方法和驱动条件设定装置
JP2017044871A (ja) 走査型顕微鏡
JP2012231911A (ja) 光走査装置および走査型観察装置
US10151918B2 (en) Scanner, scanning illuminator, and scanning observation apparatus
JP6345946B2 (ja) 光ファイバスキャナ、照明装置および観察装置
KR102555734B1 (ko) 리사주 기반의 이미지 캘리브레이션 기술
JP6226730B2 (ja) 光走査装置および光走査型観察装置
JP4672023B2 (ja) 高フレーム・レートを達成するために走査ビーム・デバイスを駆動する方法
JP2016206534A (ja) レーザ走査型顕微鏡
JP6626117B2 (ja) 光走査装置および光走査装置の制御方法
JP5865562B1 (ja) 走査型内視鏡用画像処理装置
WO2020021658A1 (fr) Dispositif de projection de lumière et procédé de projection de lumière
US20170318181A1 (en) Optical scanning method and optical scanning apparatus
US9977236B2 (en) Optical scanning method and optical scanning apparatus
US20180252910A1 (en) Optical fiber scanner, illumination device, and observation device
JP6401382B2 (ja) 光ファイバスキャナおよび走査型観察装置
JP2012078733A (ja) 共焦点内視鏡装置
WO2020021659A1 (fr) Dispositif de projection de lumière et procédé de projection de lumière
CN107427182B (zh) 扫描型观察装置和扫描型观察装置的图像显示方法
JP6382004B2 (ja) 光走査型観察装置
WO2016116968A1 (fr) Dispositif de balayage optique
JP2009145567A (ja) 走査顕微鏡

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18928129

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18928129

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP