JP6071590B2 - Optical scanning unit, optical scanning observation device, and optical scanning display device - Google Patents

Description

  The present invention relates to an optical scanning unit, an optical scanning observation device, and an optical scanning display device in which vibration driving means for vibrating an optical fiber is arranged at a specific position.

  There are known optical scanning units that can scan an object to be picked up by vibrating an optical fiber that emits light or scan an irradiation surface to form an image. In the optical scanning unit, various vibration driving means for vibrating the optical fiber have been proposed. For example, it has been proposed to attach a permanent magnet to an optical fiber supported in a cantilever shape and vibrate the optical fiber by applying an electromagnetic force (see Patent Document 1).

JP 2010-9035 A

  In the optical scanning unit, it is preferable to drive the optical fiber so as to increase the amplitude in order to realize a wide angle of view. Therefore, it is desirable to vibrate the optical fiber at the resonance frequency or the resonance frequency in order to increase the amplitude. Further, in the optical scanning unit, it is desired to vibrate the optical fiber at high speed, that is, to increase the frequency, in order to form a visible image and scan a moving object. Therefore, the vibration drive means is required to vibrate at a relatively high vibration frequency with a large amplitude at the tip of the optical fiber.

  In the vibration driving means proposed in Patent Document 1, since the permanent magnet is attached at a position away from the fixed point of the cantilever, in order to vibrate the optical fiber at a resonance frequency higher than the minimum required frequency. Needs to be vibrated in a higher order vibration mode. However, when vibrating in a higher-order vibration mode, high accuracy is required for the attachment position of a heavy object such as a permanent magnet, and variation in resonance frequency due to an error in the attachment position is large.

  The present invention has been made in view of such a viewpoint, and an object of the present invention is to provide an optical scanning unit, an optical scanning observation apparatus, and an optical scanning display apparatus that suppress variations in resonance frequency.

In order to solve the above-described problems, the optical scanning unit according to the first aspect is
It is supported in the fixed part, and the optical fiber is an end or in rockably from the fixed portion,
And a vibration driving means for vibrating said optical fiber,
The vibration driving means includes a magnetic body attached to the optical fiber,
In the higher-order vibration mode of the optical fiber by the vibration driving means, the magnetic body has an antinode of vibration outside the magnetic body and has a vibration node inside the magnetic body. Placed in the
It is characterized by this.

In the optical scanning unit according to the second aspect ,
The magnetic body is preferably arranged in the optical fiber so that the vicinity of the center of the magnetic body overlaps the node.

In the optical scanning unit according to the third aspect ,
Preferably, the higher order vibration mode is a third order vibration mode, and the node coincides with an inflection point of vibration caused by the vibration mode.

In the optical scanning unit according to the fourth aspect ,
It said vibration driving means preferably vibrates the optical fiber by Rukoto rotated along the plane of the magnetic body.

In order to solve the above-described problems, the optical scanning unit according to the fifth aspect is
An optical fiber supported at the fixed portion and swingable from the fixed portion to the end;
Vibration drive means for vibrating the optical fiber,
The vibration driving means includes a magnetic body attached to the optical fiber,
The magnetic body has a vibration antinode and a vibration node outside the magnetic body in a higher-order vibration mode of the optical fiber by the vibration driving means, and the inflection point of the vibration of the optical fiber is Arranged in the optical fiber so as to overlap,
It is characterized by this.

In the optical scanning unit according to the sixth aspect ,
The magnetic material are preferably disposed between the first antinode and the fixing part from the fixed part of the vibration due to the higher-order vibration mode.

In the optical scanning unit according to the seventh aspect ,
It said vibration driving means preferably vibrates the optical fiber by Rukoto is displaced along the plane of the magnetic body.

An optical scanning observation apparatus according to the eighth aspect is
The optical scanning unit according to any one of the first to seventh aspects is provided.

An optical scanning display device according to a ninth aspect is
The optical scanning unit according to any one of the first to seventh aspects is provided.

  According to the present invention, it is possible to suppress variations in resonance frequency in the optical scanning unit, the optical scanning observation device, and the optical scanning display device.

It is a functional block diagram which shows roughly the internal structure of the optical scanning observation apparatus which concerns on the 1st Embodiment of this invention. FIG. 2 is an overview diagram schematically showing the optical scanning endoscope main body of FIG. 1. FIG. 3 is an enlarged cross-sectional view illustrating a distal end portion of the optical scanning endoscope main body of FIG. 2. It is a perspective view which expands and shows the scanning part of FIG. It is a state figure which shows the vibration state of the rocking | swiveling part in 1st Embodiment. It is a state figure which shows the vibration state of the rocking | swiveling part in 2nd Embodiment. It is a state diagram which shows the vibration state of the rocking | swiveling part in 3rd Embodiment. It is a state figure which shows the vibration state of the rocking | swiveling part in 4th Embodiment. It is a general-view figure of the rocking | swiveling part for demonstrating the attachment position of the permanent magnet in an Example. FIG. 3 is a state diagram illustrating a vibration state of a swinging unit according to the first embodiment. FIG. 6 is a state diagram showing a vibration state of a swing part according to the second embodiment. It is a state diagram which shows the vibration state of the rocking | swiveling part of Example 3. It is a state diagram which shows the vibration state of the rocking | swiveling part of Example 4. It is a state diagram which shows the vibration state of the rocking | swiveling part of Example 5. It is a state diagram which shows the vibration state of the rocking | swiveling part of Example 6. It is a state figure which shows the vibration state of the rocking | swiveling part of Example 7. FIG. 10 is a state diagram illustrating a vibration state of a swinging unit according to an eighth embodiment. FIG. 10 is a state diagram showing a vibration state of a swing part according to a ninth embodiment. It is a state diagram which shows the vibration state of the rocking | swiveling part of Example 10. It is a state diagram which shows the vibration state of the rocking | swiveling part of Example 11. FIG. 16 is a state diagram showing a vibration state of a swing part according to a twelfth embodiment. It is a state diagram which shows the vibration state of the rocking | swiveling part of Example 13. It is a graph which shows the relationship of the resonant frequency of the rocking | swiveling part with respect to the attachment position of a permanent magnet when vibrating a 0.5 mm long permanent magnet in a secondary vibration mode. It is a graph which shows the relationship of the resonant frequency of the rocking | swiveling part with respect to the attachment position of a permanent magnet when vibrating a 0.5-mm-long permanent magnet in a tertiary vibration mode. It is a graph which shows the relationship of the resonant frequency of the rocking | swiveling part with respect to the attachment position of a permanent magnet when vibrating a 2.0-mm-long permanent magnet in a secondary vibration mode. It is a graph which shows the relationship of the resonant frequency of the rocking | swiveling part with respect to the attachment position of a permanent magnet when vibrating a 2.0-mm-long permanent magnet in a tertiary vibration mode. It is a graph which shows the relationship of the resonance frequency of the rocking | swiveling part with respect to the attachment position of a permanent magnet when a 3.0-mm-long permanent magnet is vibrated in the tertiary vibration mode. It is a graph which shows the relationship of the resonant frequency of the rocking | swiveling part with respect to the attachment position of a permanent magnet when vibrating a 4.0-mm-long permanent magnet in a secondary vibration mode. It is a graph which shows the relationship of the resonant frequency of the rocking | swiveling part with respect to the attachment position of a permanent magnet when vibrating a 4.0-mm-long permanent magnet in a tertiary vibration mode. It is a graph which shows the relationship of the amplitude of the front-end | tip part with respect to the attachment position of a permanent magnet when vibrating a 0.5-mm-long permanent magnet in a secondary vibration mode. It is a graph which shows the relationship of the amplitude of the front-end | tip part with respect to the attachment position of a permanent magnet when vibrating a 0.5-mm-long permanent magnet in a tertiary vibration mode. It is a graph which shows the relationship of the amplitude of the front-end | tip part with respect to the attachment position of a permanent magnet when vibrating the permanent magnet of length 2.0mm in a secondary vibration mode. It is a graph which shows the relationship of the amplitude of the front-end | tip part with respect to the attachment position of a permanent magnet when vibrating a permanent magnet of length 2.0mm in a tertiary vibration mode. It is a graph which shows the relationship of the amplitude of the front-end | tip part with respect to the attachment position of a permanent magnet when vibrating a permanent magnet of length 3.0mm in a tertiary vibration mode. It is a graph which shows the relationship of the amplitude of the front-end | tip part with respect to the attachment position of a permanent magnet when vibrating a 4.0-mm-long permanent magnet in a secondary vibration mode. It is a graph which shows the relationship of the amplitude of the front-end | tip part with respect to the attachment position of a permanent magnet when vibrating a 4.0-mm-long permanent magnet in a tertiary vibration mode.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a functional block diagram schematically showing an internal configuration of an optical scanning observation apparatus having an optical scanning unit according to the first embodiment of the present invention.

  The optical scanning observation device 10 is, for example, an optical scanning endoscope device, and includes a light source unit 11, an optical scanning endoscope body 12, a detection unit 13, a drive current generation unit 14, a control unit 15, and a display unit. 16 is comprised.

  The light source unit 11 is, for example, a laser light source, emits white light, and supplies the white light to the optical scanning endoscope body 12. For example, the white light is configured by combining red, green, and blue monochromatic lasers with an optical combiner configured by a dichroic mirror or an optical fiber. Or it is good also as a single white fiber laser which transmits the super continuum light etc. which are broadband. The light source is not limited to the laser light source, and may be another type of light source such as an LED (Light Emitting Diode). The optical scanning endoscope main body 12 scans the observation object obj using the supplied white light, and propagates the signal light obtained by the scanning to the detection unit 13. Before propagating the signal light to the detection unit 13, the signal light is split into light corresponding to R, G, and B wavelengths by, for example, a dichroic mirror. The split signal light is transmitted to the detection unit 13 corresponding to each wavelength. The detector 13 converts the propagated signal light into an electrical signal. The drive current generator 14 transmits a drive signal necessary for scanning the object obj to the optical scanning endoscope body 12. The control unit 15 synchronously controls the light source unit 11, the detection unit 13, and the drive current generation unit 14, processes the electrical signal output from the detection unit 13, synthesizes an image, and displays the image on the display unit 16.

  FIG. 2 is a schematic view schematically showing the optical scanning endoscope main body 12. The optical scanning endoscope main body 12 includes an operation unit 17 and an insertion unit 18, and one end of the operation unit 17 and a base end of the insertion unit 18 are connected and integrated.

  The optical scanning endoscope main body 12 includes an illumination optical fiber 19, a detection optical fiber bundle 20, a wiring cable 21, and vibration drive means. The illumination optical fiber 19, the detection optical fiber bundle 20, and the wiring cable 21 are guided from the operation unit 17 through the inside of the insertion unit 18 to the distal end portion 22 of the insertion unit 18 (part in the broken line portion in FIG. 2). . The illumination optical fiber 19 is connected to the light source unit 11 on the operation unit 17 side, and propagates white light to the distal end portion 22. The detection optical fiber bundle 20 is connected to the detection unit 13 on the operation unit 17 side, and propagates the signal light obtained at the distal end portion 22 to the detection unit 13. The wiring cable 21 is connected to the drive current generation unit 14 on the operation unit 17 side, and transmits a drive signal to the vibration drive means arranged at the tip portion 22. The vibration drive means vibrates the illumination optical fiber 19 based on the drive signal, thereby scanning the observation object obj with white light emitted from the illumination optical fiber 19.

  3 is an enlarged cross-sectional view of the distal end portion 22 of the optical scanning endoscope main body 12 of FIG. The distal end portion 22 includes vibration driving means 23, projection lenses 24a and 24b, and a detection lens (not shown), and an illumination optical fiber 19 and a detection optical fiber bundle 20 extend. The illumination optical fiber 19 and the vibration driving means 23 function as an optical scanning unit.

  The vibration driving means 23 includes a square tube 25, a permanent magnet 26 (see FIG. 4), first deflection magnetic field generating coils 27a1 to 27d1, and second deflection magnetic field generating coils 27a2 to 27d2. .

  The square tube 25 has a hollow quadrangular prism shape, one end is closed and the other end is opened. The rectangular tube 25 is arranged in the distal end portion 22 by the mounting ring 28 (see FIG. 3) so that the longitudinal direction coincides with the central axis of the distal end portion 22 and the opened end portion faces the distal end side of the distal end portion 22. Fixed. In the present embodiment, the square tube 25 having a quadrangular prism shape is applied, but a cylindrical shape and other shapes having a hollow inside may be used.

  The closed end of the square tube 25 has a hole, and the illumination optical fiber 19 is inserted through the hole. The hole is coupled to the illumination optical fiber 19 in a state where the illumination optical fiber 19 is inserted. By coupling the hole portion with the illumination optical fiber 19, a portion from the fixing portion 19a to the tip portion 19c of the illumination optical fiber 19 coupled to the hole portion is supported.

  The permanent magnet 26 has a cylindrical shape and is magnetized in the height direction of the cylinder. Hereinafter, the permanent magnet 26 is described as being magnetized in this direction, but the magnetization direction is not limited to this direction. Moreover, you may use a magnetic body instead of a permanent magnet. Considering the control of the magnetic field, the same effect as the permanent magnet can be obtained. The permanent magnet 26 is attached to the illumination optical fiber 19 in a state where the illumination optical fiber 19 is inserted through the internal through hole. A portion from the fixed portion 19a to the tip portion 19c of the illumination optical fiber 19 to which the permanent magnet 26 is attached constitutes the swing portion 19b and can swing. As shown in FIG. 5, the permanent magnet 26 has an antinode of vibration of the oscillating portion 19b in the tertiary vibration mode generated by the vibration driving means 23 on the outside and a node n of the vibration on the inside, and is permanent. The magnet 26 is attached to the illumination optical fiber 19 so that the node n inside the magnet 26 coincides with the node n overlapping the inflection point of the vibration.

  The first deflection magnetic field generating coils 27a1 to 27d1 are provided at positions facing the poles on the distal end portion 19c side of the permanent magnet 26 in the longitudinal direction of each side surface of the square tube 25 (see FIG. 4). The first deflection magnetic field generating coils 27a1 and 27c1 are provided on the side surfaces facing each other, and the first deflection magnetic field generation coils 27b1 and 27d1 are provided on the side surfaces facing each other. The straight line passing through the centers of the first deflection magnetic field generating coils 27a1 and 27c1 and the straight line passing through the centers of the first deflection magnetic field generating coils 27b1 and 27d1 are orthogonal to each other in the vicinity of the central axis of the square tube 25.

  The second deflection magnetic field generating coils 27 a 2 to 27 d 2 are provided at positions facing the pole on the fixed portion 19 a side of the permanent magnet 26 in the longitudinal direction of each side surface of the square tube 25. The second deflection magnetic field generating coils 27a2 and 27c2 are provided on the side surfaces facing each other, and the second deflection magnetic field generating coils 27b2 and 27d2 are provided on the side surfaces facing each other. The straight line passing through the centers of the second deflection magnetic field generating coils 27a2 and 27c2 and the straight line passing through the centers of the second deflection magnetic field generating coils 27b2 and 27d2 are orthogonal to each other in the vicinity of the central axis of the square tube 25.

  The first deflection magnetic field generating coils 27 a 1 to 27 d 1 and the second deflection magnetic field generating coils 27 a 2 to 27 d 2 are connected to the drive current generator 14 via the wiring cable 21. First deflection magnetic field generation coils 27a1, 27c1, first deflection magnetic field generation coils 27b1, 27d1, second deflection magnetic field generation coils 27a2, 27c2, and second deflection magnetic field generation coils 27b2, 27d2 The drive current generator 14 applies a current having a frequency that causes the vibration of the tertiary vibration mode to the swing unit 19b as a drive signal.

  When a drive signal is applied to the first deflection magnetic field generating coils 27a1, 27c1, a first axis deflection magnetic field is generated between the first deflection magnetic field generating coils 27a1, 27c1. When a drive signal is applied to the second deflection magnetic field generating coils 27a2 and 27c2, a second axial deflection magnetic field is generated between the second deflection magnetic field generating coils 27a2 and 27c2. The drive signals for causing the first axis deflection magnetic field and the second axis deflection magnetic field to have the same direction and the same magnitude are the first deflection field generation coils 27a1 and 27c1 and the second deflection field generation coil. 27a2 and 27c2. A plane passing through the centers of the first deflection magnetic field generation coils 27a1 and 27c1 and the centers of the second deflection magnetic field generation coils 27a2 and 27c2 by the first axis deflection magnetic field and the second axis deflection magnetic field based on such a drive signal. The permanent magnet 26 rotates along the oscillating portion, and the swinging portion 19b vibrates.

  When a drive signal is applied to the first deflection magnetic field generating coils 27b1, 27d1, a third axis deflection magnetic field is generated between the first deflection magnetic field generating coils 27b1, 27d1. When a drive signal is applied to the second deflection magnetic field generating coils 27b2 and 27d2, a fourth axis deflection magnetic field is generated between the second deflection magnetic field generating coils 27b2 and 27d2. The drive signals that cause the third and fourth axis deflection magnetic fields to be in the same direction and have the same magnitude are the first deflection field generation coils 27b1 and 27d1 and the second deflection field generation coil. 27b2 and 27d2. A plane passing through the centers of the first deflection magnetic field generating coils 27b1 and 27d1 and the centers of the second deflection magnetic field generating coils 27b2 and 27d2 by the third axis deflection magnetic field and the fourth axis deflection magnetic field based on such drive signals. The permanent magnet 26 rotates along the oscillating portion, and the swinging portion 19b vibrates.

  The projection lenses 24 a and 24 b and the detection lens are disposed at the forefront of the distal end portion 22 of the insertion portion 18. The projection lenses 24a and 24b are configured so that the laser light emitted from the distal end portion 19c of the illumination optical fiber 19 is substantially condensed on the observation object obj. Further, the detection lens emits light (light interacting with the observation object obj) or fluorescence that is reflected, scattered, or refracted by the observation object obj from the laser light collected on the observation object obj. It is taken in as detection light, and is arranged so as to be condensed and coupled to the detection optical fiber bundle 20 arranged after the detection lens.

  According to the optical scanning unit of the first embodiment configured as described above, the permanent magnet 26 is disposed so as to have an antinode of vibration of the swinging portion 19b in a higher-order vibration mode. In the case where there is a vibration belly an inside the permanent magnet 26, a large force for bending the permanent magnet 26 is applied. On the other hand, since the permanent magnet 26 has rigidity, the permanent magnet 26 generates a force that resists the bending force. Therefore, it is considered that the vibration becomes relatively unstable, and the resonance frequency varies due to an error in the attachment position of the permanent magnet 26. Therefore, in the present embodiment, since the permanent magnet 26 is arranged as described above, it is possible to suppress variations in the resonance frequency due to an error in the attachment position of the permanent magnet 26.

  Further, according to the optical scanning unit of the first embodiment, the permanent magnet 26 is arranged so that the permanent magnet 26 has the vibration node n of the swinging portion 19b in the tertiary vibration mode. Since the bending of the vibration node n is relatively small, the force for bending the permanent magnet 26 is relatively small. Therefore, by arranging the permanent magnet 26 so as to have the vibration node n inside, it is possible to relatively stabilize the vibration, and to suppress variations in resonance frequency due to an error in the mounting position of the permanent magnet 26. The effect can be further improved.

  Further, according to the optical scanning unit of the first embodiment, the nodes included in the permanent magnet 26 are arranged so as to coincide with the nodes n that overlap with the inflection points ip of the vibration of the rocking portion 19b in the tertiary vibration mode. Is done. Since bending due to vibration is minimized in the entire region including the inflection point, the force for bending the permanent magnet 26 in the region is relatively small. Therefore, by arranging the permanent magnet 26 as described above, it is possible to relatively stabilize the vibration, and to further improve the effect of suppressing variation in the resonance frequency due to an error in the mounting position of the permanent magnet 26. Is possible.

  Further, according to the optical scanning unit of the first embodiment, the permanent magnet 26 rotates along a plane. Variation due to an error in the attachment position of the permanent magnet 26 to the swinging portion 19b can occur not only in the resonance frequency but also in the amplitude. When the permanent magnet 26 is arranged so as to have the vibration node n inside, the permanent magnet 26 is rotated around the node n to suppress the amplitude variation and the variation in the amplitude due to the error of the mounting position. It becomes possible to do.

  Next, a second embodiment of the present invention will be described. The second embodiment differs from the first embodiment in that the vibration mode of the rocking part is secondary. The second embodiment will be described below with a focus on differences from the first embodiment. In addition, the same code | symbol is attached | subjected to the site | part which has the same structure as 1st Embodiment.

  In the second embodiment, the permanent magnet 26 has an antinode of vibration of the oscillating portion 19b in the secondary vibration mode generated by the vibration driving means 23 outside and a node n of the vibration inside. And it is attached to the optical fiber 19 for illumination so that the node n may overlap with the center vicinity of the longitudinal direction of the permanent magnet 26 (refer FIG. 6).

  In the second embodiment, the first deflecting magnetic field generating coils 27a1, 27c1, the first deflecting magnetic field generating coils 27b1, 27d1, the second deflecting magnetic field generating coils 27a2, 27c2, and the second The deflection magnetic field generating coils 27b2 and 27d2 are supplied with a current having a frequency that causes vibration in the secondary vibration mode from the drive current generator 14 to the swing unit 19b.

  Also with the optical scanning unit of the second embodiment configured as described above, the permanent magnet 26 is arranged so as to have the antinodes of vibration of the oscillating portion 19b in the higher-order vibration mode outside. It is possible to suppress variations in resonance frequency due to errors in the mounting positions of the 26. Further, also in the optical scanning unit of the second embodiment, the permanent magnet 26 is arranged so that the permanent magnet 26 has the vibration node n of the swinging portion 19b in the secondary vibration mode inside. It is possible to further improve the effect of suppressing the variation in the resonance frequency due to the error in the mounting position of 26. In addition, also with the optical scanning unit of the second embodiment, since the permanent magnet 26 rotates along a plane, it is possible to suppress the amplitude variation and the variation in the amplitude due to the attachment position error.

  Further, according to the optical scanning unit of the second embodiment, the vibration node n of the oscillating portion 19b in the tertiary vibration mode is arranged so as to overlap with the vicinity of the center of the permanent magnet 26 in the longitudinal direction. Since the bending due to vibration is relatively small in the entire part at the part centered on the node n, the force for bending the permanent magnet 26 in the part is relatively small. Therefore, by arranging the permanent magnet 26 as described above, it is possible to further improve the effect of suppressing variation in resonance frequency due to an error in the attachment position of the permanent magnet 26.

  Next, a third embodiment of the present invention will be described. The third embodiment differs from the first embodiment in the arrangement of permanent magnets. The third embodiment will be described below with a focus on differences from the first embodiment. In addition, the same code | symbol is attached | subjected to the site | part which has the same structure as 1st Embodiment.

  In the third embodiment, the permanent magnet 26 is between the first belly an from the fixed portion 19a and the fixed portion 19a by the vibration of the swinging portion 19b in the tertiary vibration mode generated by the vibration driving means 23. It is attached to the illumination optical fiber 19 so as to sandwich the inflection point ip of the vibration together with the fixing portion 19a and to have an antinode an and a node n of the vibration outside (see FIG. 7).

  In the third embodiment, the drive signals for causing the directions of the first axis deflection magnetic field and the second axis deflection magnetic field to be opposite to each other and to have the same magnitude are the first deflection magnetic field generating coils 27a1, 27c1 and the second deflection magnetic field generating coils 27a2 and 27c2. A plane passing through the centers of the first deflection magnetic field generating coils 27a1 and 37c1 and the centers of the second deflection magnetic field generating coils 27a2 and 27c2 by the first axis deflection magnetic field and the second axis deflection magnetic field based on such a drive signal. , The permanent magnet 26 is displaced, and the swinging portion 19b vibrates. Similarly, the driving signals for making the directions of the third axis deflection field and the fourth axis deflection field opposite to each other and having the same magnitude are the first deflection field generation coils 27b1, 27d1 and the second deflection field. It is transmitted to the generating coils 27b2 and 27d2. A plane passing through the centers of the first deflection magnetic field generating coils 27b1 and 27d1 and the centers of the second deflection magnetic field generating coils 27b2 and 27d2 by the third axis deflection magnetic field and the fourth axis deflection magnetic field based on such drive signals. , The permanent magnet 26 is displaced, and the swinging portion 19b vibrates.

  Also with the optical scanning unit of the third embodiment having the above-described configuration, the permanent magnet 26 is disposed so as to have the antinodes of vibration of the oscillating portion 19b in the higher-order vibration mode outside. It is possible to suppress variations in resonance frequency due to errors in the mounting positions of the 26.

  Further, according to the optical scanning unit of the third embodiment, the permanent magnet 26 is moved from the fixed portion 19a to the first belly an and the fixed portion by the vibration of the swing portion 19b in the tertiary vibration mode generated by the vibration driving means 23. It is attached to the illumination optical fiber 19 so as to sandwich the inflection point ip of the vibration together with the fixing portion 19a and the node n of the vibration outside. By satisfying such a configuration, the stress acting on the permanent magnet 26 can be reduced, and the effect of suppressing variation in resonance frequency due to an error in the attachment position of the permanent magnet 26 can be further improved.

  Further, according to the optical scanning unit of the third embodiment, the permanent magnet 26 is displaced along the plane. Variation due to an error in the attachment position of the permanent magnet 26 to the swinging portion 19b can occur not only in the resonance frequency but also in the amplitude. When the permanent magnet 26 is disposed so as to have the vibration node n outside, the permanent magnet 26 is not rotated, but is displaced to increase the amplitude and to vary the amplitude due to an error in the mounting position. It becomes possible to suppress.

  Next, a fourth embodiment of the present invention will be described. The fourth embodiment differs from the first embodiment in that the vibration mode of the rocking portion is secondary and the arrangement of the permanent magnets 26. The second embodiment will be described below with a focus on differences from the first embodiment. In addition, the same code | symbol is attached | subjected to the site | part which has the same structure as 1st Embodiment.

  In the fourth embodiment, the permanent magnet 26 is located between the first belly an from the fixed portion 19a and the fixed portion 19a due to the vibration of the swinging portion 19b in the secondary vibration mode generated by the vibration driving means 23. It is attached to the optical fiber 19 for illumination so that it has the inflection point ip of the vibration inside and has the antinode an and the node n of the vibration outside (see FIG. 8).

  In the fourth embodiment, the first deflection magnetic field generating coils 27a1, 27c1, the first deflection magnetic field generating coils 27b1, 27d1, the second deflection magnetic field generating coils 27a2, 27c2, and the second The deflection magnetic field generating coils 27b2 and 27d2 are supplied with a current having a frequency that causes vibration in the secondary vibration mode from the drive current generator 14 to the swing unit 19b.

  In the fourth embodiment, the drive signals for causing the directions of the first axis deflection magnetic field and the second axis deflection magnetic field to be opposite to each other and having the same magnitude are the first deflection magnetic field generating coils 27a1, 27c1 and the second deflection magnetic field generating coils 27a2 and 27c2. A plane passing through the centers of the first deflection magnetic field generation coils 27a1 and 27c1 and the centers of the second deflection magnetic field generation coils 27a2 and 27c2 by the first axis deflection magnetic field and the second axis deflection magnetic field based on such a drive signal. , The permanent magnet 26 is displaced, and the swinging portion 19b vibrates. Similarly, the driving signals for making the directions of the third axis deflection field and the fourth axis deflection field opposite to each other and having the same magnitude are the first deflection field generation coils 27b1, 27d1 and the second deflection field. It is transmitted to the generating coils 27b2 and 27d2. A plane passing through the centers of the first deflection magnetic field generating coils 27b1 and 27d1 and the centers of the second deflection magnetic field generating coils 27b2 and 27d2 by the third axis deflection magnetic field and the fourth axis deflection magnetic field based on such drive signals. , The permanent magnet 26 is displaced, and the swinging portion 19b vibrates.

  Also with the optical scanning unit of the fourth embodiment configured as described above, the permanent magnet 26 is disposed so as to have the antinodes of vibration of the oscillating portion 19b in the higher-order vibration mode outside. The variation of the resonance frequency due to the error of the mounting position of the 26 can be suppressed. Also by the optical scanning unit of the fourth embodiment, the permanent magnet 26 is not rotated along the plane but is displaced. It is possible to suppress variations in amplitude due to an increase in the size and an error in the mounting position.

  Further, according to the optical scanning unit of the fourth embodiment, the permanent magnet 26 is fixed to the first belly an from the fixing portion 19a by the vibration of the swinging portion 19b by the secondary vibration mode generated by the vibration driving means 23. It is attached to the optical fiber 19 for illumination so that it may have the inflection point ip of the vibration inside and the node n of the vibration outside. By satisfying such a configuration, the stress acting on the permanent magnet 26 can be reduced, and the effect of suppressing variation in resonance frequency due to an error in the attachment position of the permanent magnet 26 can be further improved.

  Next, the effects of the present invention will be described by way of examples. However, the present examples are merely examples for explaining the effects of the present invention, and do not limit the present invention.

The position of the inflection point of vibration, resonance frequency, and amplitude were calculated by the finite element method for each position where the permanent magnet 26 having a length of 0.5 mm was attached to the swing part 19b. In the following description, as shown in FIG. 9, the attachment position is represented by the distance from the fixing portion 19a. In the above calculation, the center in the longitudinal direction of the permanent magnet 26 was overlapped at each position where the mounting position was displaced 0.5 mm to 0.5 mm from the tip side. In the above calculation, vibrations in the secondary and tertiary vibration modes were generated. In the above calculation, the diameter of the illumination optical fiber 19 was 0.125 mm, the length of the swinging portion 19b was 10 mm, the Young's modulus was 70 GPa, the Poisson's ratio was 0.17, and the density was 2.2 g / cm ³ . The permanent magnet 26 has a hollow cylindrical shape with an outer diameter of 0.5 mm, an inner diameter of 0.125 mm, a Young's modulus of 150 GPa, a Poisson's ratio of 0.27, and a density of 8.3 g / cm ³ . For the electromagnetic force acting on the magnet, it was assumed that a concentrated load was acting on each point of the magnet at 1 × 10 ⁻⁴ N. When rotating the magnet, the directions of the electromagnetic forces acting on both ends are opposite to each other. When the magnet is displaced along a plane, the directions of the electromagnetic forces acting on both ends are the same. I did it.

  Similarly, for the permanent magnet 26 having a length of 1.0 mm, 2.0 mm, 3.0 mm, and 4.0 mm, the position of the inflection point of vibration, the resonance frequency, and the amplitude were calculated by the finite element method. . In the above calculation in each of the permanent magnets 26 having lengths of 1.0 mm, 2.0 mm, 3.0 mm, and 4.0 mm, the mounting position is changed from 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm to 0. The center of the permanent magnet 26 was overlapped at each position displaced to the tip side by 5 mm.

  Based on the above calculation, it was determined whether or not an antinode of vibration an occurred outside the permanent magnet 26 at each mounting position. Table 1 shows the mounting positions at which the antinodes of vibrations are generated outside the permanent magnet 26.

  As shown in Table 1, Example 1 is a swinging portion 19b having a length of the permanent magnet 26 of 0.5 mm, an attachment position of 3.5 mm, and vibrating in a secondary vibration mode. Further, the swinging portion 19b that has a length of the permanent magnet 26 of 0.5 mm, a mounting position of 6.5 mm, and vibrates in the secondary vibration mode is referred to as a second embodiment. In addition, the swinging portion 19b that has a length of the permanent magnet 26 of 0.5 mm, a mounting position of 1.5 mm, and vibrates in a tertiary vibration mode is referred to as a third embodiment. In addition, the swinging portion 19b that has a length of the permanent magnet 26 of 0.5 mm, a mounting position of 4.5 mm, and vibrates in a tertiary vibration mode is referred to as a fourth embodiment. Further, the swinging portion 19b that has a length of the permanent magnet 26 of 0.5 mm, a mounting position of 7.5 mm, and vibrates in the tertiary vibration mode is referred to as a fifth embodiment. Further, the swinging portion 19b that has the length of the permanent magnet 26 of 0.5 mm, the mounting position of 8.0 mm, and vibrates in the tertiary vibration mode is referred to as Example 6. Further, the swinging portion 19b that has a length of the permanent magnet 26 of 2.0 mm, a mounting position of 2.0 mm, and vibrates in the secondary vibration mode is referred to as a seventh embodiment. Further, the swinging portion 19b that has the length of the permanent magnet 26 of 2.0 mm, the mounting position of 6.0 mm, and vibrates in the secondary vibration mode is referred to as an eighth embodiment. Further, the swinging portion 19b that has a length of the permanent magnet 26 of 2.0 mm, a mounting position of 4.0 mm, and vibrates in the tertiary vibration mode is referred to as a ninth embodiment. In addition, the swinging portion 19b that has the length of the permanent magnet 26 of 2.0 mm, the mounting position of 5.0 mm, and vibrates in the tertiary vibration mode is referred to as Example 10. In addition, the swinging portion 19b that has the length of the permanent magnet 26 of 3.0 mm, the mounting position of 3.5 mm, and vibrates in the tertiary vibration mode is referred to as Example 11. The oscillating portion 19b that has a length of the permanent magnet 26 of 3.0 mm, an attachment position of 4.5 mm, and vibrates in the tertiary vibration mode is referred to as Example 12. Further, the swinging portion 19b having the length of the permanent magnet 26 of 4.0 mm, the mounting position of 7.5 mm, and vibrating in the secondary vibration mode is referred to as Example 13. Further, a swinging portion 19b that has a length of the permanent magnet 26 of 4.0 mm, a mounting position of 4.0 mm, and vibrates in a tertiary vibration mode is referred to as a fourteenth embodiment.

  FIGS. 10 to 22 show the vibration state of the swinging portion 19b in the first to thirteenth embodiments.

  In Examples 2, 4, 6, and 8 to 13, as shown in FIGS. 11, 13, 15, and 17 to 22, the vibration node n of the oscillating portion 19b in the higher-order vibration mode is provided inside. It can be seen that the permanent magnet 26 can be arranged.

  Further, in Examples 2, 8, and 13, as shown in FIGS. 11, 17, and 22, it can be seen that the permanent magnet 26 can be arranged so that the vicinity of the center of the permanent magnet 26 and the vibration node n overlap. .

  In Examples 4, 9, and 10, as shown in FIGS. 13, 18 and 19, it can be seen that the vibration node n and the inflection point ip can be matched in the third-order vibration mode.

  In Examples 1, 3, 6, and 7, as shown in FIGS. 10, 12, 14, and 16, the permanent magnet 26 has a vibration node n of the oscillating portion 19 b in a higher-order vibration mode outside. It can be seen that can be arranged.

  Furthermore, in the first, third, and seventh embodiments, as shown in FIGS. 10, 12, and 16, the permanent magnet 26 can be disposed between the first belly an and the fixed portion 19a from the fixed portion 19a. I understand.

  In Examples 1, 3, and 5, as shown in FIGS. 10, 12, and 14, the permanent magnet 26 can be arranged so that the inflection point ip is sandwiched between the fixed portion 19 a and the permanent magnet 26. I understand that there is.

  Moreover, in Example 7, as shown in FIG. 16, it turns out that the permanent magnet 26 can be arrange | positioned so that it may have the inflection point ip inside.

  A graph of the resonance frequency with respect to the mounting position when the length of the permanent magnet 26 is 0.5 mm and vibrates in the secondary vibration mode, where there is a mounting position that generates an antinode of vibration an outside the permanent magnet 26. This is shown in FIG. As shown in FIG. 23, the inclination of the curve of the resonance frequency with respect to the mounting position is relatively small when the mounting position is around 3.5 mm and 6.5 mm. Therefore, in Examples 1 and 2, it can be seen that the variation in the resonance frequency with respect to the error in the mounting position can be suppressed.

  Further, a graph of the resonance frequency with respect to the attachment position when the permanent magnet 26 is oscillated in the tertiary vibration mode with the length of the permanent magnet 26 having an attachment position that generates an antinode of vibration an outside the permanent magnet 26. Is shown in FIG. As shown in FIG. 24, the inclination of the curve of the resonance frequency with respect to the mounting position is relatively small when the mounting position is around 1.5 mm, 4.5, 7.5, and 8.0 mm. Therefore, in Example 3 to Example 6, it can be seen that the variation of the resonance frequency with respect to the error of the mounting position can be suppressed.

  Further, there is an attachment position that generates an antinode of vibration an outside of the permanent magnet 26, and the resonance frequency of the attachment position when the permanent magnet 26 is vibrated in the secondary vibration mode with a length of 2.0 mm. The graph is shown in FIG. As shown in FIG. 25, the inclination of the curve of the resonance frequency with respect to the mounting position is relatively small when the mounting position is around 2.0 mm and 6.0 mm. Therefore, in Examples 7 and 8, it can be seen that the variation of the resonance frequency with respect to the error of the mounting position can be suppressed.

  Further, a graph of the resonance frequency with respect to the mounting position when the permanent magnet 26 is oscillated in the third vibration mode with the length of the permanent magnet 26 being 2.0 mm, where there is an mounting position that generates an antinode of vibration outside the permanent magnet 26. This is shown in FIG. As shown in FIG. 26, the inclination of the curve of the resonance frequency with respect to the mounting position is relatively small when the mounting position is around 4.0 mm and 5.0 mm. Therefore, in Examples 9 and 10, it can be seen that the variation of the resonance frequency with respect to the error of the mounting position can be suppressed.

  Further, a graph of the resonance frequency with respect to the mounting position when the permanent magnet 26 is oscillated in the tertiary vibration mode with the length of the permanent magnet 26 being 3.0 mm where there is an mounting position that generates an anti-vibration an of the outside of the permanent magnet 26. This is shown in FIG. As shown in FIG. 27, the inclination of the curve of the resonance frequency with respect to the mounting position is relatively small when the mounting position is in the vicinity of 3.5 mm and 4.5 mm. Therefore, in Examples 11 and 12, it can be seen that the variation of the resonance frequency with respect to the error of the mounting position can be suppressed.

  In addition, there is an attachment position that generates an anti-vibration vibration an outside the permanent magnet 26. When the permanent magnet 26 is 4.0 mm long and vibrates in the secondary vibration mode, the resonance frequency relative to the attachment position is The graph is shown in FIG. As shown in FIG. 28, when the attachment position is around 7.5 mm, the slope of the curve of the resonance frequency with respect to the attachment position is relatively small. Therefore, in Example 13, it can be seen that the variation of the resonance frequency with respect to the error of the mounting position can be suppressed.

  In addition, there is a mounting position that generates an antinode of vibration outside the permanent magnet 26. When the permanent magnet 26 has a length of 4.0 mm and is vibrated in the third vibration mode, a graph of the resonance frequency with respect to the mounting position. This is shown in FIG. As shown in FIG. 29, when the attachment position is around 4.0 mm, the slope of the resonance frequency curve with respect to the attachment position is relatively small. Therefore, in Example 14, it turns out that the dispersion | variation in the resonant frequency with respect to the error of an attachment position can be suppressed.

  In the secondary vibration mode, the permanent magnet 26 is vibrated by rotating or displacing the permanent magnet 26 in the secondary vibration mode in which there is an attachment position for generating an anti-vibration ann outside the permanent magnet 26. FIG. 30 shows a graph of the amplitude of the distal end portion 19c of the illumination optical fiber 19 with respect to the mounting position.

  As shown in FIG. 30, the amplitude when the permanent magnet 26 is rotated when the mounting position is around 6.5 mm is large, and the slope of the amplitude curve with respect to the mounting position is relatively small. Therefore, in the second embodiment, it can be seen that by rotating the permanent magnet 26, it is possible to suppress the amplitude variation and the variation in the amplitude with respect to the error of the mounting position. Further, when the permanent magnet 26 is displaced in the vicinity of the attachment position of 3.5 mm, the amplitude becomes large, and the slope of the amplitude curve with respect to the attachment position is relatively small. Therefore, in Example 1, it can be seen that by displacing the permanent magnet 26, it is possible to suppress the amplitude variation and the variation in the amplitude with respect to the error of the mounting position.

  The permanent magnet 26 is oscillated by rotating or displacing the permanent magnet 26 in the tertiary vibration mode in which the permanent magnet 26 has a length of 0.5 mm and there is an attachment position for generating an antinode of vibration outside the permanent magnet 26. FIG. 31 shows a graph of the amplitude of the distal end portion 19c of the illumination optical fiber 19 with respect to the mounting position.

  As shown in FIG. 31, when the attachment position is around 4.5 mm and 8.0 mm, the amplitude increases when the permanent magnet 26 is rotated, and the slope of the amplitude curve relative to the attachment position is relatively small. Therefore, in Examples 4 and 6, it can be seen that by rotating the permanent magnet 26, it is possible to suppress the amplitude variation and the variation in the amplitude with respect to the error of the mounting position. Further, when the permanent magnet 26 is displaced in the vicinity of the mounting position of 1.5 mm and 7.5, the amplitude increases, and the slope of the amplitude curve with respect to the mounting position is relatively small. Therefore, in Examples 3 and 5, it can be seen that by displacing the permanent magnet 26, it is possible to suppress the amplitude variation and the variation in the amplitude with respect to the error of the mounting position.

  The permanent magnet 26 is vibrated by rotating or displacing the permanent magnet 26 in the secondary vibration mode in which the attachment position for generating the anti-vibration an is present outside the permanent magnet 26 and the length of the permanent magnet 26 is 2.0 mm. FIG. 32 shows a graph of the amplitude of the tip of the illumination optical fiber 19 with respect to the mounting position.

  As shown in FIG. 32, when the mounting position is around 6.0 mm, the amplitude increases when the permanent magnet 26 is rotated, and the slope of the curve of the amplitude with respect to the mounting position is relatively small. Therefore, in the eighth embodiment, it can be seen that by rotating the permanent magnet 26, it is possible to suppress the amplitude variation and the variation in the amplitude with respect to the error of the mounting position. In addition, when the permanent magnet 26 is displaced near the mounting position of 2.0, the amplitude increases, and the slope of the amplitude curve with respect to the mounting position is relatively small. Therefore, in Example 7, it can be seen that by displacing the permanent magnet 26, it is possible to suppress the amplitude variation and the variation in the amplitude with respect to the error of the mounting position.

  The permanent magnet 26 is vibrated by rotating or displacing the permanent magnet 26 in the tertiary vibration mode in which the attachment position for generating the vibration anti-an exists outside the permanent magnet 26 and the length of the permanent magnet 26 is 2.0 mm. FIG. 33 shows a graph of the amplitude of the tip of the illumination optical fiber 19 with respect to the mounting position.

  As shown in FIG. 33, when the attachment position is around 4.0 mm and 5.0 mm, the amplitude increases when the permanent magnet 26 is rotated, and the slope of the amplitude curve relative to the attachment position is relatively small. Therefore, in Examples 9 and 10, it can be seen that by rotating the permanent magnet 26, it is possible to suppress the amplitude variation and the variation in the amplitude with respect to the error of the mounting position.

  The permanent magnet 26 is oscillated by rotating or displacing the permanent magnet 26 in the tertiary vibration mode in which the permanent magnet 26 has a length of 3.0 mm and there is an attachment position for generating an antinode of vibration an outside of the permanent magnet 26. FIG. 34 shows a graph of the amplitude of the tip of the illumination optical fiber 19 with respect to the mounting position.

  As shown in FIG. 34, when the mounting position is around 3.5 mm and 4.5 mm, the amplitude increases when the permanent magnet 26 is rotated, and the slope of the amplitude curve with respect to the mounting position is relatively small. Therefore, in Examples 11 and 12, it can be seen that by rotating the permanent magnet 26, it is possible to suppress the amplitude variation and the variation in the amplitude with respect to the error of the mounting position.

  The permanent magnet 26 is vibrated by rotating or displacing the permanent magnet 26 in the secondary vibration mode in which the permanent magnet 26 has a length of 4.0 mm and there is an attachment position for generating an antinode of vibration an outside of the permanent magnet 26. A graph of the amplitude of the tip of the illumination optical fiber 19 with respect to the mounting position is shown in FIG.

  As shown in FIG. 35, when the attachment position is in the vicinity of 7.5 mm, the amplitude increases when the permanent magnet 26 is rotated, and the slope of the curve of the amplitude with respect to the attachment position is relatively small. Therefore, in the thirteenth embodiment, it can be seen that by rotating the permanent magnet 26, it is possible to suppress the amplitude variation and the variation in the amplitude with respect to the error of the mounting position.

  There is an attachment position for generating an antinode of vibration outside the permanent magnet 26. The length of the permanent magnet 26 is 4.0 mm, and the permanent magnet 26 is vibrated by rotating or displacing in the tertiary vibration mode. FIG. 36 shows a graph of the amplitude of the tip of the illumination optical fiber 19 with respect to the mounting position.

  As shown in FIG. 36, when the mounting position is around 4.0 mm, the amplitude when the permanent magnet 26 is rotated is large, and the slope of the curve of the amplitude with respect to the mounting position is relatively small. Therefore, in Example 14, it can be seen that by rotating the permanent magnet 26, it is possible to increase the amplitude and to suppress variations in amplitude with respect to an error in the mounting position.

  Although the present invention has been described based on the drawings and embodiments, it should be noted that those skilled in the art can easily make various changes and modifications based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention.

  For example, in the first to third embodiments, the optical scanning unit is applied to the optical scanning endoscope apparatus, but the present invention can also be applied to other apparatuses that scan a surface. For example, the optical scanning unit may be applied to an optical scanning display device that displays an image on the illuminated surface by vibrating the illumination optical fiber 19 while changing the wavelength and intensity of the emitted light. In addition, the light observation apparatus can be applied to, for example, an operation microscope. As an optical scanning apparatus using a laser, for example, it can be applied to a laser processing apparatus, a laser treatment apparatus, and laser measurement.

DESCRIPTION OF SYMBOLS 10 Optical scanning type observation apparatus 11 Light source part 12 Optical scanning type endoscope main body 13 Detection part 14 Drive current generation part 15 Control part 16 Display part 17 Operation part 18 Insertion part 19 Optical fiber for illumination 19a Fixing part 19b Oscillating part 19c Tip portion 20 Optical fiber bundle for detection 21 Wiring cable 22 Tip portion 23 Vibration drive means 24a, 24b Projection lens 25 Square tube 26 Permanent magnet 27a1-27d1 First deflection magnetic field generating coil 27a2-27d2 Second deflection magnetic field Coil for generating 28 Mounting ring an belly n node ip Inflection point obj Object to be observed

Claims (9)

It is supported in the fixed part, and the optical fiber is an end or in rockably from the fixed portion,
And a vibration driving means for vibrating said optical fiber,
The vibration driving means includes a magnetic body attached to the optical fiber,
In the higher-order vibration mode of the optical fiber by the vibration driving means, the magnetic body has an antinode of vibration outside the magnetic body and has a vibration node inside the magnetic body. Placed in the
An optical scanning unit characterized by that. 2. The optical scanning unit according to claim 1 , wherein the magnetic body is disposed in the optical fiber so that a vicinity of a center of the magnetic body overlaps the node. 3. The optical scanning unit according to claim 1 or claim 2, wherein the higher-order vibration mode is a third-order vibration mode, said clause to match the inflection point of the vibration by the vibration mode An optical scanning unit characterized. The optical scanning unit according to any one of claims 1 to 3, wherein the vibration driving means, characterized in that vibrating the optical fiber by Rukoto rotated along the plane of the magnetic body An optical scanning unit. An optical fiber supported at the fixed portion and swingable from the fixed portion to the end;
Vibration drive means for vibrating the optical fiber,
The vibration driving means includes a magnetic body attached to the optical fiber,
The magnetic body has a vibration antinode and a vibration node outside the magnetic body in a higher-order vibration mode of the optical fiber by the vibration driving means, and the inflection point of the vibration of the optical fiber is Arranged in the optical fiber so as to overlap,
An optical scanning unit characterized by that. The optical scanning unit according to claim 5, wherein the magnetic body light, characterized in that disposed between the first antinode and the fixing part from the fixed part of the vibration due to the higher-order vibration mode Scanning unit. The optical scanning unit according to claim 5 or claim 6, wherein the vibration driving means optical scanning unit, characterized in that vibrating the optical fiber by Rukoto is displaced along the plane of the magnetic body. An optical scanning observation apparatus comprising the optical scanning unit according to any one of claims 1 to 7 . Optical scanning type display apparatus comprising the optical scanning unit according to any one of claims 1 to 7.

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