JP2014094158A - Scanning type endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scanning type endoscope capable of suppressing the irregularity in the brightness of an image obtained by scanning an object.SOLUTION: A scanning type endoscope comprises: an illuminating fiber 12 constituted for transmitting and emanating illumination light for illuminating an object from an end portion; an actuator unit 15 capable of rocking the end portion of the illuminating fiber 12 in such a manner as to draw a locus according to a predetermined scanning pattern; and a light emission portion interposed between the end portion of the illuminating fiber 12 and the object for shielding or dipping at least the illumination light emanating from the illuminating fiber 12 rocked at the peripheral edge portion of the predetermined scanning pattern and emanating the illumination light to the object.

Description

  The present invention relates to a scanning endoscope, and more particularly to a scanning endoscope that scans a subject within a scanning range corresponding to a scanning pattern.

  In endoscopes in the medical field, various techniques have been proposed for reducing the diameter of an insertion portion that is inserted into a body cavity of a subject in order to reduce the burden on the subject. And as what belongs to such a technique, the scanning endoscope which does not have a solid-state image sensor in the part corresponded to the above-mentioned insertion part is known conventionally, for example.

  Specifically, the scanning endoscope described above operates, for example, an actuator attached to an illumination fiber that guides illumination light emitted from the light source unit, and the illumination fiber is moved in a predetermined scanning pattern. By swinging, the subject is scanned within the scanning range corresponding to the predetermined scanning pattern. Patent Document 1 discloses an optical scanning endoscope having a configuration substantially similar to the above configuration.

  By the way, according to the above-described scanning endoscope, for example, it corresponds to a scanning pattern in which the difference in scanning density is significant while the amount of illumination light supplied from the light source unit to the illumination fiber is kept constant. When scanning a subject within a scanning range, there is a problem that unevenness occurs in the brightness of an image generated based on the return light of the illumination light.

  On the other hand, Patent Document 1 does not particularly mention a technique that can solve the above-described problems, that is, there are still problems corresponding to the above-described problems.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a scanning endoscope that can suppress unevenness in brightness of an image obtained by scanning a subject.

  A scanning endoscope according to an aspect of the present invention draws a trajectory according to a predetermined scanning pattern, and an optical transmission unit configured to transmit illumination light for illuminating a subject and emit the light from an end. And an optical scanning unit capable of swinging the end of the optical transmission unit and between the end of the optical transmission unit and the subject, and at least the predetermined scanning And a light emitting unit configured to block or reduce the illumination light emitted from the light transmission unit oscillated around the peripheral edge of the pattern and emit the light to the subject.

  According to the scanning endoscope of the present invention, unevenness in brightness of an image obtained by scanning a subject can be suppressed.

The figure which shows the structure of the principal part of the scanning endoscope system containing the scanning endoscope which concerns on a 1st Example. The figure which shows an example of the internal structure of the front-end | tip part of the scanning endoscope which concerns on a 1st Example. III-III sectional view taken on the line of FIG. The figure which shows an example of a Lissajous scanning pattern. Between the distance from the center of the Lissajous scanning pattern of FIG. 4 and the amount of illumination light necessary to make the brightness of the image generated based on the return light from the subject a desired brightness The graph which shows an example of correlation. The figure for demonstrating the correlation between the scanning range corresponding to the Lissajous scanning pattern of FIG. 4, and the irradiation state of the illumination light irradiated from the front-end | tip part of FIG. The figure which shows an example of the internal structure of the front-end | tip part of the scanning endoscope which concerns on a 2nd Example. The figure which shows an example of a structure at the time of seeing from the direction shown by arrow AR1 of FIG. The figure for demonstrating the correlation between the scanning range corresponding to the Lissajous scanning pattern of FIG. 4, and the irradiation state of the illumination light irradiated from the front-end | tip part of FIG. The figure which shows an example of a structure at the time of changing the shape of the circle CC2 of FIG. 8 into octagonal OCT. The figure which shows an example of a spiral scanning pattern. The figure for demonstrating the correlation between the scanning range corresponding to the spiral scanning pattern of FIG. 11, and the irradiation state of the illumination light irradiated from the front-end | tip part of FIG. The figure which shows the example different from FIG. 11 of a spiral scanning pattern. The figure which shows the example different from FIG. 7 of the internal structure of the front-end | tip part of the scanning endoscope which concerns on a 2nd Example. The figure which shows an example of a structure at the time of seeing from the direction shown by arrow AR2 of FIG. The figure for demonstrating the correlation between the scanning range corresponding to the spiral scanning pattern of FIG. 13, and the irradiation state of the illumination light irradiated from the front-end | tip part of FIG.

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

(First embodiment)
1 to 6 relate to a first embodiment of the present invention. FIG. 1 is a diagram illustrating a configuration of a main part of a scanning endoscope system including a scanning endoscope according to a first embodiment.

  As shown in FIG. 1, for example, the scanning endoscope system 1 includes a scanning endoscope 2 that can be inserted into a body cavity of a subject, a main body device 3 that is connected to the scanning endoscope 2, And a monitor 4 connected to the main unit 3.

  The scanning endoscope 2 includes an insertion portion 11 formed with an elongated cylindrical shape and flexibility. Note that a connector (not shown) or the like for detachably connecting the scanning endoscope 2 to the main body device 3 is provided at the proximal end portion of the insertion portion 11.

  FIG. 2 is a diagram illustrating an example of the internal configuration of the distal end portion of the scanning endoscope according to the first embodiment. As shown in FIG. 2, the distal end portion 11 </ b> A of the insertion portion 11 includes an end portion on the light emission side of the illumination fiber 12 having a function as a light transmission portion that transmits illumination light supplied from the main body device 3. The light receiving side end of the light receiving fiber 13 that receives the return light from the subject and guides it to the main unit 3 and the illumination light emitted from the illumination fiber 12 are condensed and emitted. A condensing optical system 61 and an actuator unit 15 that can oscillate the light emitting side end of the illumination fiber 12 based on a drive signal output from the main body device 3 are provided.

  Each part of the illumination fiber 12, the condensing optical system 61, and the actuator part 15 is accommodated in the sheath 51 which has flexibility. A plurality of light receiving fibers 13 are embedded in the sheath 51 in an annular shape.

  The condensing optical system 61 is attached to a light shielding frame 52 formed by a light shielding member, and includes a lens 61a that receives illumination light from the illumination fiber 12, and a lens 61b that emits illumination light that has passed through the lens 61a. , And is configured.

  The lens 61a and the lens 61b are formed to have a positive refractive power and an effective diameter ED1, respectively.

  3 is a cross-sectional view taken along line III-III in FIG. As shown in FIG. 3, a ferrule 41 as a joining member is disposed between the illumination fiber 12 and the actuator unit 15. Specifically, the ferrule 41 is made of, for example, zirconia (ceramic) or nickel.

  As shown in FIG. 3, the ferrule 41 is formed as a quadrangular prism, and has side surfaces 42 a and 42 c that are perpendicular to the X-axis direction (left-right direction of the paper surface) and the Y-axis direction (up-down direction of the paper surface). Vertical side surfaces 42b and 42d. The illumination fiber 12 is fixedly arranged at the center of the ferrule 41. Note that the ferrule 41 may be formed in a shape other than the quadrangular column as long as it is a rectangular column.

  As shown in FIG. 3, the actuator unit 15 includes an actuator 15a disposed along the side surface 42a, an actuator 15b disposed along the side surface 42b, an actuator 15c disposed along the side surface 42c, and a side surface 42d. And an actuator 15d arranged along the line.

  The actuators 15a and 15c are formed by, for example, piezoelectric elements (piezo elements), and are configured to be driven according to a first drive signal output from the D / A converter 34a of the driver unit 22. .

  The actuators 15b and 15d are formed by piezoelectric elements (piezo elements), for example, and are configured to be driven according to the second drive signal output from the D / A converter 34b of the driver unit 22. .

  On the other hand, the main device 3 includes a light source unit 21, a driver unit 22, a detection unit 23, a memory 24, and a controller 25.

  The light source unit 21 includes a light source 31a, a light source 31b, a light source 31c, and a multiplexer 32.

  The light source 31 a includes, for example, a laser light source and the like, and is configured to emit red wavelength band light (hereinafter also referred to as R light) to the multiplexer 32 when turned on under the control of the controller 25. Yes.

  The light source 31b includes a laser light source, for example, and is configured to emit light in a green wavelength band (hereinafter also referred to as G light) to the multiplexer 32 when turned on under the control of the controller 25. Yes.

  The light source 31c includes, for example, a laser light source, and is configured to emit light in a blue wavelength band (hereinafter also referred to as B light) to the multiplexer 32 when turned on under the control of the controller 25. Yes.

  The multiplexer 32 multiplexes the R light emitted from the light source 31a, the G light emitted from the light source 31b, and the B light emitted from the light source 31c onto the light incident surface of the illumination fiber 12. It is configured so that it can be supplied.

  The driver unit 22 includes a signal generator 33, D / A converters 34a and 34b, and an amplifier 35.

  Based on the control of the controller 25, the signal generator 33 generates a drive signal for swinging the end including the light emitting surface of the illumination fiber 12 and outputs the drive signal to the D / A converters 34a and 34b. It is configured.

  The D / A converters 34 a and 34 b are configured to convert the digital drive signal output from the signal generator 33 into an analog drive signal and output the analog drive signal to the amplifier 35.

  The amplifier 35 is configured to amplify the drive signals output from the D / A converters 34 a and 34 b and output the amplified drive signals to the actuator unit 15.

  On the other hand, the detection unit 23 includes a duplexer 36, detectors 37a, 37b, and 37c, and A / D converters 38a, 38b, and 38c.

  The demultiplexer 36 includes a dichroic mirror and the like, and separates the return light emitted from the light emitting surface of the light receiving fiber 13 into light for each of R (red), G (green), and B (blue) color components. And it is comprised so that it may radiate | emit to the detectors 37a, 37b, and 37c.

  The detector 37a detects the intensity of the R light output from the duplexer 36, generates an analog R signal corresponding to the detected intensity of the R light, and outputs the analog R signal to the A / D converter 38a. It is configured.

  The detector 37b detects the intensity of the G light output from the duplexer 36, generates an analog G signal corresponding to the detected intensity of the G light, and outputs the analog G signal to the A / D converter 38b. It is configured.

  The detector 37c detects the intensity of the B light output from the duplexer 36, generates an analog B signal according to the detected intensity of the B light, and outputs the analog B signal to the A / D converter 38c. It is configured.

  The A / D converter 38 a is configured to convert the analog R signal output from the detector 37 a into a digital R signal and output it to the controller 25.

  The A / D converter 38b is configured to convert the analog G signal output from the detector 37b into a digital G signal and output the digital G signal to the controller 25.

  The A / D converter 38 c is configured to convert the analog B signal output from the detector 37 c into a digital B signal and output it to the controller 25.

  The memory 24 stores in advance a control program for controlling the main device 3.

  The controller 25 includes a CPU and the like, and is configured to read a control program stored in the memory 24 and control the light source unit 21 and the driver unit 22 based on the read control program. That is, the actuator unit 15 has a function as an optical scanning unit, and the irradiation position of the illumination light irradiated to the subject based on the drive signal output from the driver unit 22 according to the control of the controller 25 as described above. The illumination fiber 12 can be swung so as to draw a locus corresponding to a predetermined scanning pattern.

  The controller 25 is configured to generate an image based on the R signal, the G signal, and the B signal output from the detection unit 23 and display the generated image on the monitor 4.

  Next, the operation of the scanning endoscope system 1 having the above-described configuration will be described.

  After the power of each part of the scanning endoscope system 1 is turned on, the controller 25 performs control for switching the light sources 31a and 31b and the light source 31c from OFF to ON based on the control program stored in the memory 24. And controlling the driver unit 22 to output from the signal generator 33 first and second drive signals for swinging the illumination fiber 12 in a Lissajous scanning pattern (see FIG. 4). Do it. By such control of the controller 25, the end including the light emitting surface of the illumination fiber 12 is swung by a Lissajous scanning pattern (see FIG. 4), and the R light, G light, and B light are controlled. The mixed light is emitted from the illumination fiber 12 as illumination light. FIG. 4 is a diagram illustrating an example of a Lissajous scanning pattern.

  By the way, when the illumination fiber 12 is swung in the Lissajous scanning pattern of FIG. 4, the scanning density of the peripheral portion of the scanning pattern tends to be significantly higher than the scanning density of other portions. . In consideration of such a tendency, for example, in order to suppress unevenness in brightness of an image obtained when the subject is scanned with the Lissajous scanning pattern of FIG. 4, for example, a scanning range corresponding to the scanning pattern. For the light source unit 21 and the like, such that the light amount of the illumination light irradiated to the peripheral portion of the light source is significantly lower than the light amount of the illumination light irradiated to other portions other than the peripheral portion (for the light source unit 21 etc. ) It is assumed that it is necessary to do this.

  In contrast, in this embodiment, the effective diameter of the illumination light beam emitted from the illumination fiber 12 oscillated around the peripheral portion of the Lissajous scanning pattern of FIG. 4 is prevented from entering the lens 61a and the lens 61b. The lens 61a is provided on a light shielding frame 52 that defines the ED1 and further can shield illumination light emitted from the illumination fiber 12 that is swung around the peripheral portion of the Lissajous scanning pattern of FIG. In addition, since the lens 61b is attached, it is possible to suppress unevenness in the brightness of the image obtained when the subject is scanned with the scanning pattern without performing complicated control as exemplified above. I have to.

  In the present embodiment, the brightness of the image generated based on the distance from the center of the Lissajous scanning pattern of FIG. 4 and the return light from the subject as shown in the graph of FIG. The effective diameter ED1 of the lens 61a and the lens 61b can be defined on the basis of the correlation between the amount of illumination light necessary for the adjustment. FIG. 5 shows the distance from the center of the Lissajous scanning pattern of FIG. 4 and the amount of illumination light necessary to make the brightness of the image generated based on the return light from the subject desired. It is a graph which shows an example of the correlation between these.

  Specifically, for example, when the threshold value (lower limit) of the amount of illumination light necessary for setting the brightness of the image generated based on the return light from the subject to a desired brightness is AL, The effective diameter ED1 of the lens 61a and the lens 61b can be defined by obtaining the distance DS corresponding to the threshold AL based on the graph of FIG. 5 and further doubling the distance DS.

  In other words, the light emitting portion of the present embodiment is provided between the light emitting side end of the illumination fiber 12 and the subject, and is attached to the light shielding frame 52 formed by the light shielding member. The light collecting optical system 61 of ED1 is provided.

  6 is a diagram for explaining a correlation between the scanning range corresponding to the Lissajous scanning pattern of FIG. 4 and the irradiation state of the illumination light irradiated from the tip portion of FIG.

  As described above, according to the present embodiment, for example, the scanning range corresponding to the Lissajous scanning pattern of FIG. 4 is defined as a rectangular region centered on the point P as shown in FIG. In some cases, the illumination light is irradiated to the inside of the area CA1 (circular shape) centered on the point P, while the illumination light is not irradiated to the outside of the area CA1. As a result, according to the present embodiment, the scanning range corresponding to the scanning pattern in which the difference in scanning density is significant while maintaining the light amount of the illumination light supplied from the light source unit 21 to the illumination fiber 12 at a constant light amount. Even in the case of scanning a subject inside, it is possible to suppress unevenness in brightness of an image obtained by scanning the subject.

(Second embodiment)
7 to 16 relate to a second embodiment of the present invention.

  In the present embodiment, detailed description of portions having the same configuration as the first embodiment is omitted, and portions having different configurations from the first embodiment are mainly described.

  The insertion portion 11 of the present embodiment is configured to have a distal end portion 11B as shown in FIG. 7 instead of the distal end portion 11A described in the first embodiment. FIG. 7 is a diagram illustrating an example of the internal configuration of the distal end portion of the scanning endoscope according to the second embodiment.

  Specifically, as shown in FIG. 7, the distal end portion 11 </ b> B of the insertion portion 11 includes an end portion on the light emitting side of the illumination fiber 12, an end portion on the light incident side of the light receiving fiber 13, and a condensing optical system. A system 62, an actuator unit 15, and a light reducing member 63A formed by a light reducing filter or the like are included.

  The condensing optical system 62 includes a lens 62a that receives illumination light from the illumination fiber 12, and a lens 62b that emits illumination light that has passed through the lens 62a.

  The lens 62a and the lens 62b are formed so as to have a positive refractive power and an effective diameter ED2, respectively. Specifically, the effective diameter ED2 of the lens 62a and the lens 62b makes the luminous flux of the illumination light emitted from the illumination fiber 12 oscillated at an arbitrary position in the Lissajous scanning pattern of FIG. Is defined as the possible diameter.

  The dimming member 63A is disposed on the optical path from the light emitting surface of the illumination fiber 12 to the light incident surface of the lens 62a. For example, the light reducing member 63A is swung to the peripheral portion of the Lissajous scanning pattern of FIG. The illumination light emitted from the illumination fiber 12 can be dimmed and incident on the lens 62a. Specifically, the dimming member 63A includes, for example, as shown in FIG. 8, the inside of a circle CC1 having the same diameter as the effective diameter ED2 of the lens 62a in the light incident surface of the lens 62a, and the lens 62a. The region corresponding to the outside of the circle CC2 having a diameter smaller than the effective diameter ED2 is provided so as to cover an annular shape. FIG. 8 is a diagram showing an example of the configuration when viewed from the direction indicated by the arrow AR1 in FIG.

  That is, the light emitting section of the present embodiment is configured to include the condensing optical system 62 and the light reducing member 63A provided between the light emitting side end of the illumination fiber 12 and the subject. .

  FIG. 9 is a diagram for explaining a correlation between the scanning range corresponding to the Lissajous scanning pattern of FIG. 4 and the irradiation state of the illumination light irradiated from the tip portion of FIG.

  As described above, according to the present embodiment, for example, the scanning range corresponding to the Lissajous scanning pattern of FIG. 4 is defined as a rectangular region centered on the point P as shown in FIG. In this case, the inside of the area CA2 (circular shape) centered on the point P is irradiated with illumination light of a light amount corresponding to the set value of the light source unit 21, while outside the area CA2. On the other hand, illumination light having a light amount lower than the light amount corresponding to the set value is irradiated. As a result, according to the present embodiment, the scanning range corresponding to the scanning pattern in which the difference in scanning density is significant while maintaining the light amount of the illumination light supplied from the light source unit 21 to the illumination fiber 12 at a constant light amount. Even when scanning a subject within the image, it is possible to suppress unevenness in brightness of an image obtained by scanning the subject.

  In the present embodiment, instead of the dimming member 63A, for example, the tip portion 11B may be configured using a light shielding member such as a pinhole having the same configuration as that of the dimming member 63A described above. Good.

  Further, according to this embodiment, the diameter of the circle CC2 of the dimming member 63A is not limited to be fixed to a predetermined size. For example, the operation unit (not shown) of the scanning endoscope 2 is used. The diameter of the circle CC2 of the dimming member 63A can be changed to a desired size in accordance with the operation of a scope switch (not shown) provided on the dimming member 63A. It may be possible to increase or decrease the area to be displayed. According to such a configuration, for example, the size of the lumen to be observed, the size of the diameter of the circle CC2 of the dimming member 63A (or the size of the region covered by the dimming member 63A), A plurality of observation modes associated with each other can be set, and an image having a suitable brightness can be acquired for each of the set plurality of observation modes.

  Moreover, according to the present embodiment, the shape of the circle CC2 on the inner peripheral side of the dimming member 63A is changed to an octagonal OCT circumscribing the circle CC2, for example, as shown in FIG. You may make it expand an observation visual field (angle of view). FIG. 10 is a diagram illustrating an example of a configuration when the shape of the circle CC2 in FIG. 8 is changed to an octagonal OCT.

  Further, the configuration of the distal end portion 11B of the present embodiment is not limited to the configuration that can be applied only when the subject is scanned with the Lissajous scanning pattern of FIG. 4, for example, the scanning density of the peripheral portion is that of other portions. The present invention can be similarly applied to the case where the subject is scanned with the spiral scanning pattern of FIG. 11 that is significantly higher than the scanning density. FIG. 11 is a diagram illustrating an example of a spiral scanning pattern.

  12 is a diagram for explaining a correlation between the scanning range corresponding to the spiral scanning pattern of FIG. 11 and the irradiation state of the illumination light irradiated from the tip portion of FIG.

  Then, for example, when the scanning range corresponding to the spiral scanning pattern in FIG. 11 is defined as a circular area centered on the point Q as shown in FIG. The shape of the region CA3 is irradiated with illumination light having a light amount corresponding to the set value of the light source unit 21, while the light amount corresponding to the set value is applied to the outside of the region CA3. A lower amount of illumination light is irradiated. That is, according to the present embodiment, even when the subject is scanned with the spiral scanning pattern of FIG. 11, the same effects as when the subject is scanned with the Lissajous scanning pattern of FIG. It can be demonstrated.

  On the other hand, according to the present embodiment, by appropriately modifying the configuration of the tip portion 11B, the scanning density of the central portion and the peripheral portion, for example, like the spiral scanning pattern of FIG. It is also possible to adopt a configuration suitable for a case where the subject is scanned with a scanning pattern that becomes significantly higher. FIG. 13 is a diagram illustrating an example of a spiral scanning pattern different from FIG.

  Specifically, for example, a dimming member capable of dimming the illumination light emitted from the illumination fiber 12 oscillated at the center of the spiral scanning pattern of FIG. 13 and entering the lens 62a. By adding 63B to the above-described tip end portion 11B, the tip end portion 11C of FIG. 14 may be configured. FIG. 14 is a diagram illustrating an example of the internal configuration of the distal end portion of the scanning endoscope according to the second embodiment, which is different from FIG.

  The light reducing member 63B is formed of a light reducing filter or the like, and is disposed on the optical path from the light emitting surface of the illumination fiber 12 to the light incident surface of the lens 62a. Further, as shown in FIG. 15, for example, the dimming member 63B is provided so as to cover the inside of a circle CC3 corresponding to the center of the light incident surface of the lens 62a. FIG. 15 is a diagram illustrating an example of the configuration when viewed from the direction indicated by the arrow AR2 in FIG.

  That is, the light emitting section of this modification includes a condensing optical system 62, a light reducing member 63A, and a light reducing member 63B provided between the light emitting end of the illumination fiber 12 and the subject. Configured.

  FIG. 16 is a diagram for explaining a correlation between the scanning range corresponding to the spiral scanning pattern of FIG. 13 and the irradiation state of the illumination light irradiated from the tip portion of FIG.

  Then, for example, when the scanning range corresponding to the spiral scanning pattern of FIG. 13 is defined as a circular area centered on the point R as shown in FIG. The portion of the interior of the area CA3 excluding the central area CA4 is irradiated with illumination light having a light amount corresponding to the set value of the light source unit 21, while the outside of the area CA3. Illumination light having a light amount lower than the light amount corresponding to the set value is irradiated to the inside of the area CA4. That is, according to the present embodiment, even when the subject is scanned with the spiral scanning pattern of FIG. 13, the same effects as when the subject is scanned with the Lissajous scanning pattern of FIG. It can be demonstrated.

  As described above, according to the present embodiment, a scanning pattern in which the difference in scanning density is significant while maintaining the amount of illumination light supplied from the light source unit 21 to the illumination fiber 12 at a constant amount. Even when a subject within a corresponding scanning range is scanned, unevenness in brightness of an image obtained by scanning the subject can be suppressed.

  It should be noted that the present invention is not limited to the above-described embodiments, and it is needless to say that various changes and applications can be made without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1 Scanning endoscope system 2 Scanning endoscope 3 Main body apparatus 4 Monitor 11 Insertion part 11A, 11B, 11C Tip part 12 Illumination fiber 13 Light reception fiber 15 Actuator part 21 Light source unit 22 Driver unit 23 Detection unit 24 Memory 25 Controller 52 Light shielding frames 61, 62 Condensing optical systems 63A, 63B

Japanese Unexamined Patent Publication No. 2010-117442

Claims (6)

An optical transmission unit configured to transmit illumination light for illuminating a subject and emit the light from the end; and
An optical scanning unit capable of swinging the end of the optical transmission unit so as to draw a trajectory according to a predetermined scanning pattern;
The illumination light is provided between the end of the light transmission unit and the subject, and at least shields the illumination light emitted from the light transmission unit swung around a peripheral edge of the predetermined scanning pattern. A light emitting portion configured to be dimmed and emitted to the subject;
A scanning endoscope characterized by comprising: The light emitting portion has an effective diameter defined so that a light beam of the illumination light emitted from the light transmission portion swung around a peripheral portion of the predetermined scanning pattern is not incident, and the predetermined scanning The optical system attached to the light-shielding member which can shield the said illumination light radiate | emitted from the said optical transmission part rock | fluctuated by the peripheral part of the pattern is comprised. Scanning endoscope. The predetermined scanning pattern is a Lissajous scanning pattern,
The effective diameter of the optical system is the distance required from the center of the Lissajous scanning pattern and the brightness of an image generated based on the return light from the subject to a desired brightness. The scanning endoscope according to claim 2, wherein the scanning endoscope is defined based on a correlation between the amount of illumination light and the amount of illumination light. The predetermined scanning pattern is a Lissajous scanning pattern or a spiral scanning pattern,
The light emitting unit can diminish the illumination light emitted from the light transmission unit oscillated at a peripheral portion of the Lissajous scanning pattern and emit the light to the subject, and the spiral shape A dimming unit configured to be able to diminish the illumination light emitted from the light transmission unit oscillated around the periphery of the scanning pattern and emit the dimmed light to the subject. The scanning endoscope according to claim 1. The predetermined scanning pattern is a Lissajous scanning pattern or a spiral scanning pattern,
The light emitting unit can shield the illumination light emitted from the light transmission unit oscillated at a peripheral portion of the Lissajous scanning pattern and emit the light to the subject, and the spiral scanning. The light-shielding part comprised so that the said illumination light radiate | emitted from the said optical transmission part rock | fluctuated to the peripheral part of the pattern could be light-shielded and it may be radiate | emitted to the to-be-photographed object. Item 2. The scanning endoscope according to Item 1. The predetermined scanning pattern is a spiral scanning pattern,
The light emitting section includes a first dimming section for dimming the illumination light emitted from the light transmission section oscillated at a peripheral edge of the spiral scanning pattern and emitting the illumination light to the subject; A second dimming unit for dimming the illumination light emitted from the light transmission unit oscillated at the center of the spiral scanning pattern and emitting it to the subject. The scanning endoscope according to claim 1.

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