WO2021131447A1

WO2021131447A1 - Endoscope

Info

Publication number: WO2021131447A1
Application number: PCT/JP2020/043323
Authority: WO
Inventors: 敦小師
Original assignee: Hoya株式会社
Priority date: 2019-12-25
Filing date: 2020-11-20
Publication date: 2021-07-01
Also published as: JP2021101960A; WO2021131447A8; CN114760905A

Abstract

The purpose of the present invention is to provide an endoscope and the like which prevent the occurrence of crosstalk between a plurality of light-emitting parts.　This endoscope is provided with an observation window disposed at a leading end of an insertion part, and an illumination part for illuminating the viewing direction of the observation window. The illumination part comprises a first light-emitting part (519) that radiates broadband light, and a second light-emitting part (529) that is disposed closer to the leading end than the first light-emitting part (519) and radiates narrowband light. The first light-emitting part (519) includes a light-emitting element, and phosphor-containing resin that covers the light-emitting element.

Description

Endoscope

The present invention relates to an endoscope.

An endoscope in which a white light emitting part and a narrow band light emitting part are alternately arranged on the circumference has been proposed (Patent Document 1). The white light emitting unit is usually used for illumination during light observation. The narrow band light emitting unit is used for illumination during special light observation.

Japanese Unexamined Patent Publication No. 2005-74034

The white light emitting unit is realized by, for example, a combination of a blue light emitting body and a phosphor that is excited by blue light and emits yellow light. When the light emitted from the narrow band light emitting part irradiates the phosphor of the white light emitting part, a so-called crosstalk phenomenon occurs in which the white light emitting part emits light when it should be in a non-light emitting state. Light emission due to the crosstalk phenomenon adversely affects the color tone of the endoscopic image.

One aspect is to provide an endoscope or the like that prevents crosstalk from occurring between a plurality of light emitting units.

The endoscope includes an observation window arranged at the tip of the insertion portion and an illumination unit that illuminates the viewing direction of the observation window. The illumination unit includes a first light emitting unit that emits broadband light and the first light emitting unit. It has a second light emitting part that is arranged on the tip side of the first light emitting part and emits narrow band light.

On one side, it is possible to provide an endoscope or the like that prevents crosstalk from occurring between a plurality of light emitting units.

It is an external view of an endoscope. FIG. 2 is a view taken along the line II in FIG. FIG. 3 is a view taken along the line III in FIG. It is a partial cross-sectional view of the endoscope by IV-IV line in FIG. It is a partial cross-sectional view of the endoscope by VV line in FIG. It is sectional drawing of the endoscope by VI-VI line in FIG. FIG. 4 is a cross-sectional view of the endoscope taken along the line VII-VII in FIG. It is a perspective view of the lighting substrate for an endoscope. It is a front view of the illumination board for an endoscope. 9 is a partial cross-sectional view of the illumination substrate for an endoscope in FIG. 9 by X-rays. 9 is a partial cross-sectional view of the illumination substrate for an endoscope taken along the line XI-XI in FIG. 9 is a partial cross-sectional view of a lighting substrate for an endoscope in FIG. 9 taken by line XII-XII. It is a partial cross-sectional view of the illumination substrate for an endoscope of Embodiment 2. It is a partial cross-sectional view of the illumination substrate for an endoscope of the modification of Embodiment 2. It is a partial cross-sectional view of the lighting substrate for an endoscope of Embodiment 3. It is a partial cross-sectional view of the illumination substrate for an endoscope of Embodiment 4.

[Embodiment 1]
FIG. 1 is an external view of the endoscope 10. The endoscope 10 of the present embodiment is a flexible mirror for the gastrointestinal tract. The endoscope 10 has an insertion unit 14, an operation unit 20, a universal cord 25, and a connector unit 24. The operation unit 20 has a curved knob 21 and a channel inlet 22.

The insertion portion 14 is long, and one end thereof is connected to the operation portion 20 via the folding portion 16. The insertion portion 14 has a flexible portion 11, a curved portion 12, and a tip portion 13 in this order from the operation portion 20 side. The curved portion 12 is curved according to the operation of the curved knob 21.

A channel 15 penetrating the insertion portion 14 is provided from the channel inlet 22 to the tip portion 13. A forceps plug 23 having an insertion port for inserting a treatment tool or the like is attached to the channel inlet 22.

In the following description, the longitudinal direction of the insertion portion 14 will be described as the insertion direction. Similarly, the side closer to the operation unit 20 along the insertion direction is described as the operation unit side, and the side far from the operation unit 20 is described as the tip side.

The universal cord 25 is long, and the first end is connected to the operation unit 20 and the second end is connected to the connector unit 24. The connector portion 24 is covered with a substantially rectangular parallelepiped connector case 26. The scope connector 27 projects from one surface of the connector case 26. The connector unit 24 is connected to an endoscope processor or the like (not shown).

FIG. 2 is a view taken along the line II in FIG. FIG. 3 is a view taken along the line III in FIG. FIG. 2 shows a state in which the end surface of the insertion portion 14 is viewed from the front. FIG. 3 shows the side surface of the tip portion 13.

As shown in FIG. 2, the observation window 36 is arranged at a position shifted upward in FIG. 2 from the central axis of the insertion portion 14. As shown in FIG. 3, the observation window 36 has a dome shape. An annular illumination window 39 is arranged around the observation window 36. The details of the illumination window 39 will be described later.

At the lower right of the observation window 36 in FIG. 2, an air supply / water supply nozzle 37 is arranged with the outlet facing the observation window 36. A channel outlet 152 and a tip water supply hole 38 are arranged at the lower left of the observation window 36, respectively.

Note that FIG. 2 is an example of the appearance of the end face of the tip portion 13, and the arrangement of each member is not limited to FIG. For example, instead of the air supply water supply nozzle 37, an independent air supply nozzle and a water supply nozzle may be provided.

As shown in FIG. 3, the tip portion 13 has a first frame 31 and a second frame 32 from the tip side. The lower half of the first frame 31 in FIG. 3, that is, the portion provided with the air supply water supply nozzle 37, the channel outlet 152, and the tip water supply hole 38 is a substantially conical surface.

The first frame 31 has a protruding portion 311 protruding toward the operation portion on the upper side in FIG. At the end of the second frame 32 on the tip end side, the portion corresponding to the protrusion 311 is retracted toward the operation portion. By engaging the protrusion 311 with the recess of the second frame 32, the angle in the rotation direction between the first frame 31 and the second frame 32 is regulated.

The fourth frame 34 is fixed to the operation unit side of the second frame 32. The curved piece 122 shown by the alternate long and short dash line in FIG. 3 is fitted and fixed to the fourth frame 34. The portion of the second frame 32 on the operation portion side and the curved piece 122 are covered with the curved rubber 121.

FIG. 4 is a partial cross-sectional view of the endoscope 10 by the IV-IV line in FIG. FIG. 5 is a partial cross-sectional view of the endoscope 10 taken along the line VV in FIG. FIG. 6 is a cross-sectional view of the endoscope 10 taken along the line VI-VI in FIG. FIG. 7 is a cross-sectional view of the endoscope 10 taken along the line VII-VII in FIG. In FIGS. 4 and 5, the curved piece 122 and the curved rubber 121 are not shown.

The above-mentioned first frame 31, second frame 32 and fourth frame 34 are tubular. A tubular third frame 33 is housed inside the first frame 31 and the second frame 32. The third frame 33 is a stepped tubular type having a thick tip side and a thin operation portion side. As shown in FIG. 7, the cross section of the third frame 33 is circular on the outside and rectangular on the inside. The dimensions of the inner rectangle are substantially uniform over the overall length of the third frame 33.

An annular lighting substrate 41 for an endoscope is arranged on the end surface of the third frame 33 on the tip end side. As shown in FIG. 6, a first light emitting unit 519 and a second light emitting unit 529 that emit illumination light are arranged on the peripheral edge of the surface on the distal end side of the endoscope illumination substrate 41. The second light emitting unit 529 includes a green light emitting element 521 (see FIG. 9) and a purple light emitting element 522 (see FIG. 9). The first light emitting unit 519 and the second light emitting unit 529 are examples of an illumination unit that illuminates the visual field direction of the present embodiment.

Details of the configuration of the endoscope lighting board 41 will be described later. In the following description, when it is not necessary to distinguish the first light emitting element 51 (see FIG. 9), the green light emitting element 521, and the purple light emitting element 522, it is simply referred to as the light emitting element 50 (see FIG. 9). ..

The first frame 31 is made of a translucent resin that transmits light radiated from the light emitting element 50. As shown in FIG. 5, on the inner surface of the first frame 31, a portion facing the light emitting element 50 is recessed in a U-shaped groove shape to form a concave lens. Due to the effect of the concave lens and the effect that the side surface of the light emitting element 50 is not covered by the second layer 62 (see FIG. 8), the light emitted from the light emitting element 50 is as shown by A in FIG. Illuminates a wide range from the front to the side of the insertion portion 14.

The portion that transmits the light radiated from the light emitting element 50 of the first frame 31 fulfills the function of the illumination window 39. The tip portion of the first frame 31 may be formed of a translucent resin, and the other portion may be formed of a translucent resin. The tip portion of the first frame 31 is formed of any translucent material such as translucent resin or translucent ceramics, and the other portion is formed of any material such as resin, metal or ceramics. Is also good.

A tubular fifth frame 35 is inserted into the endoscope illumination substrate 41 and the third frame 33. As shown in FIG. 6, the outside of the cross section on the tip side of the fifth frame 35 is a substantially D-shape with the straight portion facing the channel outlet 152 side, and the outside of the cross section on the operation portion side is as shown in FIG. Is rectangular. The hole penetrating the fifth frame 35 in the longitudinal direction has a circular cross section having a uniform thickness.

As shown in FIG. 6, two cable grooves 351 extending along the longitudinal direction of the fifth frame 35 are provided in a substantially D-shaped curved portion of the fifth frame 35. The two cable grooves 351 are arranged substantially symmetrically. The bottom portion of the cable groove 351 is substantially flush with the side surface on the short side side of the rectangular cross-sectional portion described with reference to FIG. 7.

Returning to FIGS. 4 and 5, the explanation will be continued. The lens unit 361 is inserted into the fifth frame 35 from the tip end side. The lens unit 361 has a lens frame 364 and a plurality of lenses fixed to the lens frame 364. Among the lenses constituting the lens unit 361, the edge of the lens on the most advanced side and the edge of the hole of the first frame 31 are arranged so as to be gently connected. The observation window 36 described above is the outer surface of the lens arranged on the most distal side.

The lens unit 361 of this embodiment is a so-called ultra-wide-angle lens having a viewing angle of more than 150 degrees. The lens unit 361 has a lens having a large diameter on the tip side and a lens having a small diameter on the operation unit side. The lens frame 364 has a cylindrical shape having a collar on the tip side. A lens on the tip side having a large diameter is fixed to the flange portion of the lens frame 364, and a lens on the operation unit side having a small diameter is fixed to the inner surface of the lens frame 364.

The image pickup unit 362 is arranged on the operation unit side of the lens unit 361. The image pickup unit 362 is a member in which an image pickup element 363 arranged on the end face on the tip end side, a driver circuit, a cable connected to the driver circuit, and the like are solidified into a substantially rectangular parallelepiped shape. The image pickup unit 362 has an image pickup cable 365 extending toward the operation unit side. The image pickup cable 365 is a bundle of a plurality of cables. The image pickup cable 365 is connected to the endoscope processor via the operation unit 20, the universal cord 25, and the connector unit 24.

The positional relationship between the lens unit 361 and the image pickup unit 362 is adjusted so that the light incident on the lens unit 361 is imaged on the image pickup element 363. The lens unit 361 and the image pickup unit 362 constitute an observation optical system of the endoscope 10.

The first frame 31 is provided with a channel outlet 152, an air supply water supply nozzle 37, and a through hole corresponding to the tip water supply hole 38, respectively. As shown in FIG. 4, the through hole corresponding to the channel outlet 152 is a stepped hole having a large inner diameter on the operation unit side, and the channel tube 151 is connected to the through hole.

Although not shown, a tip water supply tube is connected to the through hole corresponding to the tip water supply hole 38. An air supply water supply nozzle 37 is attached to the tip side of the through hole corresponding to the air supply water supply nozzle 37, and an air supply tube and a water supply tube are attached to the operation unit side.

FIG. 8 is a perspective view of the illumination substrate 41 for an endoscope. FIG. 9 is a front view of the endoscope illumination substrate 41.

As described above, the illumination substrate 41 for an endoscope is annular. A substantially D-shaped imaging hole 411 is provided in the central portion of the endoscope illumination substrate 41. A substantially arc-shaped channel recess 412 is provided on the outer periphery of the endoscope illumination substrate 41 in the vicinity of the straight line portion of the imaging hole 411.

The illumination board 41 for an endoscope is a so-called multilayer PCB (Printed Circuit Board) in which a plurality of wiring layers and an insulating layer are laminated. The endoscope illumination substrate 41 has a first layer 61 and a second layer 62. One or both of the first layer 61 and the second layer 62 may have a plurality of wiring layers and an insulating layer.

Eight first light emitting elements 51 are mounted on the first layer 61 at substantially equal intervals along the outer circumference of the endoscope illumination substrate 41. The channel recess 412 described above is arranged so as to be located between two adjacent first light emitting elements 51.

Three wiring lands 44 are arranged between the second first light emitting element 51 and the third first light emitting element 51 from each of the first light emitting elements 51 located on both sides of the channel recess 412. ing. The two sets of wiring lands 44 are arranged so as to face each other with the image pickup hole 411 in between. The wiring land 44 is an example of the cable connection portion of the present embodiment.

The second layer 62 is laminated on the first layer 61 except for the place where the first light emitting element 51 is mounted and its vicinity, and the place where the wiring land 44 is arranged and its vicinity. In the vicinity of the place where the first light emitting element 51 is mounted, the end surface of the second layer 62 surrounds the first light emitting element 51, and the outer peripheral side of the illumination substrate 41 for an endoscope is open in a U shape. It forms a wall 621.

In the vicinity of the place where the wiring lands 44 are arranged, the end surface of the second layer 62 surrounds the three wiring lands 44, and the inner peripheral side of the illumination substrate 41 for an endoscope is opened in a U-shaped connection portion. It forms a wall surface 432.

Four second light emitting units 529 are arranged in the second layer 62. The second light emitting unit 529 includes a green light emitting element 521 and a purple light emitting element 522 arranged adjacent to each other along the outer periphery of the endoscope illumination substrate 41. The second light emitting unit 529 is arranged at every other place between the two adjacent first light emitting elements 51. Neither the channel recess 412 nor the wiring land 44 is arranged at the location where the second light emitting unit 529 is arranged.

Each of the first light emitting elements 51 is arranged at substantially equidistant distance from the optical axis of the observation optical system composed of the image pickup unit 362 and the lens unit 361. Each of the second light emitting units 529 is also arranged at substantially equidistant distance from the optical axis of the observation optical system composed of the image pickup unit 362 and the lens unit 361.

As shown in FIG. 5, the illumination substrate 41 for an endoscope is assembled to the endoscope 10 with the mounting surface on which the light emitting element 50 such as the first light emitting element 51 is mounted facing the tip side.

FIG. 10 is a partial cross-sectional view of the illumination substrate 41 for an endoscope in FIG. 9 by X-rays. FIG. 11 is a partial cross-sectional view of the illumination substrate 41 for an endoscope taken along the line XI-XI in FIG. FIG. 12 is a partial cross-sectional view of the illumination substrate 41 for an endoscope taken along the line XII-XII in FIG.

FIG. 10 includes two first light emitting units 519 and a second light emitting unit 529 arranged between them, and the endoscope has an arcuate curve substantially parallel to the outer circumference of the endoscope illumination substrate 41. The cross section which cut the lighting board 41 for use is shown. FIG. 11 shows a cross section of the endoscope illumination substrate 41 cut from a plane extending in the radial direction through one first light emitting unit 519. FIG. 12 shows a cross section of the endoscope illumination substrate 41 cut from a plane extending in the radial direction through one green light emitting element 521.

10 to 12, the internal structure of the light emitting element 50, the laminated structure of the wiring layer and the insulating layer constituting the illumination substrate 41 for the endoscope, and the wiring pattern provided in the wiring layer are not shown. ..

As shown in FIGS. 10 and 11, a space surrounded by a U-shaped wall 621, a first layer 61, an outer peripheral surface of an endoscope illumination substrate 41, and an extension surface of a main surface of the second layer 62. The first light emitting element 51 is covered with the fluorescent resin 511 filled in the above. That is, the fluorescent resin 511 is embedded in the second layer 62. The first light emitting unit 519 of the present embodiment is composed of the first light emitting element 51 and the fluorescent resin 511.

As shown in FIGS. 10 and 12, each light emitting element 50 constituting the second light emitting unit 529 is mounted on the surface of the second layer 62. That is, each of the light emitting elements 50 constituting the second light emitting unit 529 is arranged above the surface of the fluorescent resin 511 in FIGS. 10 to 12.

Although not shown, wiring is formed on the endoscope illumination substrate 41 to connect the land on which the light emitting element 50 is mounted and the wiring land 44.

Return to Fig. 7 and continue the explanation. An illumination cable 332 extends from the endoscope processor to the tip portion 13 via the connector portion 24, the universal cord 25, and the operation portion 20. The lighting cable 332 is a bundle of a plurality of cables. In FIG. 7, the lighting cable 332 is arranged on the left side of the fifth frame 35.

At the tip portion 13, the lighting cable 332 is divided into two sets of bundles. One bundle is pulled out in the vicinity of the wiring land 44 on the left side through the cable groove 351 on the left side in FIG. The other bundle is routed in the substantially U-shaped wiring groove 331 provided in the third frame 33, and then pulled out to the vicinity of the wiring land 44 on the right side through the cable groove 351 on the right side in FIG. ing.

Each wire constituting the lighting cable 332 is connected to the wiring land 44 by an arbitrary method such as soldering. In FIG. 6, the wires connected to the respective wiring lands 44 are not shown. The light emission of the light emitting element 50 is controlled by the endoscope processor via the illumination cable 332.

The fluorescent resin 511 will be described. In the present embodiment, the first light emitting unit 519 is a so-called light source for normal light observation, and the second light emitting unit 529 is a so-called special light observation light source. For normal light observation, white light with a wide band is used as illumination light. However, a semiconductor light emitting device such as an LED (Light Emitting Diode) is a narrow band light emitting element that emits narrow band light having a narrow bandwidth.

A technique for obtaining white light, which is wideband light, by irradiating a phosphor with narrow-band light emitted from a semiconductor light emitting element and radiating a mixture of fluorescence emitted from the phosphor and light emitted from a semiconductor light emitting element. Has been developed. For example, it is known that white light can be obtained by the combinations shown in Table 1.

In this embodiment, No. The case where the combination of 1 is used for the first light emitting element 51 will be described as an example. That is, the fluorescent resin 511 of the present embodiment is a resin in which a yellow phosphor is mixed with a translucent resin, and the first light emitting element 51 is a blue LED.

The color of the light emitting element 50 and the color of the phosphor are No. 1 in Table 1. A combination of 2 or any other combination that can obtain illumination light suitable for normal light observation can be used.

The illumination light for observing special light emitted by the second light emitting unit 529 will be described. Special light observation is a technique for emphasizing and displaying blood vessels running deep in a mucous membrane, for example, by using narrow-band illumination light. For example, a method using the illumination light shown in Table 2 has been proposed.

It is desirable that each color shown in Table 2 is narrow band light with a narrow band. A semiconductor light emitting element such as an LED or a semiconductor laser can be used for the second light emitting unit 529. In the present embodiment, No. 1 in which the green light emitting element 521 and the purple light emitting element 522 are used. The case where the combination of 3 is used will be described as an example.

Return to FIG. 10 and continue the explanation. When normal light observation is performed, the first light emitting element 51 is turned on, and the light emitting element 50 constituting the second light emitting unit 529 is turned off. The light emitted from the first light emitting element 51 becomes white light due to the action of the phosphor in the fluorescent resin 511 and illuminates the front and side from the illumination window 39. That is, the first light emitting unit 519 irradiates the illumination light for normal light observation.

When performing special light observation, the first light emitting element 51 is turned off and the light emitting element 50 constituting the second light emitting unit 529 is turned on. The light emitted from the second light emitting unit 529 illuminates the front and side from the illumination window 39.

If the light emitted from the second light emitting unit 529 is incident on the fluorescent resin 511, crosstalk is generated in which the fluorescent resin 511 emits light. That is, the first light emitting unit 519 is in a pseudo light emitting state even though the special light is being observed.

However, as described above, the light emitting element 50 constituting the second light emitting unit 529 is mounted on the surface of the second layer 62. The light emitted from the second light emitting unit 529 does not enter the fluorescent resin 511 embedded in the second layer 62. As described above, it is possible to prevent or suppress the crosstalk in which the light emitted from the second light emitting unit 529 is incident on the fluorescent resin 511 and emitted.

According to the present embodiment, it is possible to provide the endoscope 10 in which crosstalk is prevented from occurring between a plurality of light emitting units. Since the illumination light for white observation does not cause crosstalk due to the illumination for special light observation, the image quality during special light observation is improved.

According to the present embodiment, since the light radiated from the side surface of the light emitting element 50 arranged around the observation window 36 is not blocked, it is possible to provide the endoscope 10 that illuminates the side of the insertion portion 14. Since the illumination light reaches the edge of the observation field of view using the wide-angle observation optical system, it is possible to provide the endoscope 10 capable of observing a wide field of view.

The U-shaped wall 621 may be formed on a surface having high reflectance by polishing or forming a metal film. It is possible to provide the endoscope 10 in which the white light emitted from the first light emitting unit 519 can brightly illuminate the side of the insertion unit 14.

Since the first light emitting unit 519 and the second light emitting unit 529 are evenly arranged around the observation window 36, it is possible to provide the endoscope 10 with less unevenness in brightness. Since the green light emitting element 521 and the purple light emitting element 522 are arranged adjacent to each other, it is possible to provide the endoscope 10 with less color unevenness of the special light observation illumination.

Since the U-shaped groove-shaped concave lens is formed on the inner surface of the first frame 31, the light radiated from the first light emitting unit 519 and the second light emitting unit 529 is diffused. This makes it possible to provide an endoscope 10 capable of illuminating a wide range.

The shape of the lens formed on the inner surface of the first frame 31 may be different between the portion facing the first light emitting unit 519 and the portion facing the second light emitting unit 529. For example, the light emitted from the first light emitting unit 519 is diffused over a wide range, and the light emitted from the second light emitting unit 529 is strongly emitted toward the front of the insertion unit 14, so that the light emitted from the first frame 31 Form the inner lens.

When using the endoscope 10 having a wide observation field of view as in the present embodiment, it is necessary to illuminate the side of the insertion portion 14 with the illumination light for normal light observation. The user can discover the lesion site by observing a wide area at the same time.

When performing special light observation in endoscopy, the user operates the endoscope 10 so that the portion of interest is in the center of the endoscopic field of view. Therefore, it is desirable that the illumination light for observation for special light emitted by the second light emitting unit 529 focuses on the central portion of the field of view. By not diffusing the illumination light to the peripheral portion of the visual field, the central portion of the visual field can be illuminated brightly.

The light emitted from the first light emitting unit 519 is diffused over a wide range, and the light emitted from the second light emitting unit 529 is strongly emitted toward the front of the insertion unit 14, so that normal light observation can be performed. It is possible to provide an endoscope 10 that illuminates a range suitable for each of the special light observations.

Since the channel recess 412 is provided on the outer periphery of the endoscope illumination substrate 41, the observation window 36 and the channel outlet 152 can be arranged close to each other. This makes it possible to provide an endoscope 10 having a reduced diameter at the tip portion 13.

The endoscope 10 may be disassembled for each case, and any parts such as the endoscope illumination substrate 41, the lens unit 361, and the imaging unit 362 may be reused as appropriate.

[Embodiment 2]
The present embodiment relates to an endoscope 10 in which a so-called white light emitting element in which a semiconductor light emitting element and a phosphor are sealed in one package is used for the first light emitting element 51. The description of the parts common to the first embodiment will be omitted.

FIG. 13 is a partial cross-sectional view of the illumination substrate 41 for an endoscope according to the second embodiment. FIG. 13 shows a partial cross section at the same position as in FIG.

The first light emitting element 51 of the present embodiment is larger than the green light emitting element 521 and the purple light emitting element 522 as shown in FIG. 13 because the semiconductor light emitting element and the phosphor are packaged.

The first light emitting element 51 is mounted on the first layer 61. The height T1 to the surface of the second layer 62 with reference to the surface of the first layer 61 is higher than the height T2 of the first light emitting element 51. As shown by the arrows in FIG. 13, these light emitting elements 50 are used even when the green light emitting element 521 and the purple light emitting element 522 having a very wide directional angle that radiate light in a direction parallel to the mounting surface are used. The illumination light emitted from the light emitting element 51 does not cause crosstalk of the first light emitting element 51.

FIG. 14 is a partial cross-sectional view of the endoscope illumination substrate 41 of the modified example of the second embodiment. FIG. 14 shows a partial cross section at the same position as in FIG.

In the modified example shown in FIG. 14, the height T1 to the surface of the second layer 62 is lower than the height T2 of the first light emitting element 51. However, in general, the directivity angle of a semiconductor light emitting element is narrower than that of a light emitting body such as a light bulb. Therefore, light in a direction parallel to the mounting surface shown by the broken line in FIG. 14 is hardly emitted.

Therefore, even when the height T1 is lower than the height T2 as shown in FIG. 14, crosstalk of the first light emitting element 51 can be prevented.

According to this embodiment, a commercially available white light emitting element can be used for the first light emitting element 51. After mounting the first light emitting element 51, it is not necessary to cover it with the fluorescent resin 511, so that the illumination substrate 41 for an endoscope can be easily assembled.

[Embodiment 3]
The present embodiment relates to an endoscope 10 in which a light emitting element 50 constituting a second light emitting unit 529 is mounted via a spacer 527. The description of the parts common to the first embodiment will be omitted.

FIG. 15 is a partial cross-sectional view of the illumination substrate 41 for an endoscope according to the third embodiment. FIG. 15 shows a partial cross section at the same position as in FIG.

In the present embodiment, the green light emitting element 521 and the purple light emitting element 522 are mounted on the first layer 61 via the spacer 527. The spacer 527 is pre-attached to and integrated with, for example, the green light emitting element 521 and the purple light emitting element 522. A green light emitting element 521 and a purple light emitting element 522 may be attached to one spacer 527 in advance.

In either case, the light emitting element 50 is connected to the wiring pattern provided in the first layer 61 via the connecting member provided in the spacer 527. After the first light emitting element 51 and the spacer 527 are mounted on the first layer 61, the green light emitting element 521 and the purple light emitting element 522 may be attached to the spacer 527.

According to this embodiment, since it is not necessary to stack the first layer 61 and the second layer 62, the illumination substrate 41 for an endoscope can be easily manufactured.

[Embodiment 4]
The present embodiment relates to an endoscope 10 in which a support plate 429 is provided on an endoscope illumination substrate 41. The description of the parts common to the first embodiment will be omitted.

FIG. 16 is a partial cross-sectional view of the illumination substrate 41 for an endoscope according to the fourth embodiment. FIG. 16 shows a partial cross section at the same position as in FIG.

The illumination substrate 41 for an endoscope of the present embodiment is a laminate of a first layer 61, a second layer 62, and a support plate 429. A thin substrate is used for the first layer 61. The first layer 61 may be so-called FPC (Flexible printed circuits) using a polyimide sheet or the like as an insulating layer.

The second layer 62 is laminated on the mounting surface side of the first layer 61. The support plate 429 is laminated on the surface of the first layer 61 opposite to the mounting surface.

The support plate 429 is a plate that supports the first layer 61 and the second layer 62 and prevents disconnection due to bending or the like. The support plate 429 is a metal plate made of, for example, copper, aluminum, or stainless steel. The support plate 429 may be a ceramic plate or a resin plate. When the support plate 429 is conductive, an insulating layer without a pattern or the like is arranged on the side of the first layer 61 in contact with the support plate 429.

According to the present embodiment, it is possible to provide the endoscope 10 in which disconnection of the illumination substrate 41 for an endoscope is unlikely to occur during assembly work.

By using a material having high thermal conductivity such as metal for the support plate 429, it is possible to provide the endoscope 10 capable of rapidly diffusing the heat generated by the light emitting element 50. Since heat diffusion is rapidly performed in the endoscope illumination substrate 41, by arranging a heat dissipation sheet or a cooling element at an arbitrary place in the endoscope illumination substrate 41, the endoscope illumination substrate 41 Can prevent overheating.

The technical features (constituent requirements) described in each embodiment can be combined with each other, and by combining them, a new technical feature can be formed.
The embodiments disclosed this time should be considered as exemplary in all respects and not restrictive. The scope of the present invention is indicated by the scope of claims, not the above-mentioned meaning, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

10 Endoscope 11 Flexible part 12 Curved part 121 Curved rubber 122 Curved piece 13 Tip part 14 Insert part 15 Channel 151 Channel tube 152 Channel outlet 16 Folding part 20 Operation part 21 Curved knob 22 Channel entrance 23 Force plug 24 Connector part 25 Universal Cord 26 Connector Case 27 Scope Connector 31 1st Frame 311 Protruding Part 32 2nd Frame 33 3rd Frame 331 Wiring Groove 332 Lighting Cable 34 4th Frame 35 5th Frame 351 Cable Groove 36 Observation Window 361 Lens Unit 362 Imaging Unit 363 Imaging element 364 Lens frame 365 Imaging cable 37 Air supply water supply nozzle 38 Tip water supply hole 39 Lighting window 41 Endoscope lighting board 411 Imaging hole 412 Channel recess 429 Support plate 432 Connection wall surface 44 Wiring land 50 Light emitting element 51 First light emission Element 511 Fluorescent resin 519 1st light emitting part 521 Green light emitting element 522 Purple light emitting element 527 Spacer 529 2nd light emitting part 61 1st layer 62 2nd layer 621 U-shaped wall

Claims

An observation window located at the tip of the insertion part,
A lighting unit that illuminates the viewing direction of the observation window is provided.
The lighting unit
The first light emitting part that emits wideband light and
An endoscope having a second light emitting part that is arranged on the tip side of the first light emitting part and emits narrow band light.
The first light emitting unit
Light emitting element and
The endoscope according to claim 1, further comprising a resin containing a phosphor that covers the light emitting element.
The endoscope according to claim 1, wherein the first light emitting unit includes a white light emitting element.
The endoscope according to any one of claims 1 to 3, wherein the second light emitting unit includes a purple light emitting element or a green light emitting element.
The endoscope according to any one of claims 1 to 3, wherein the second light emitting unit includes a blue light emitting element or a green light emitting element.
A plurality of the first light emitting units are arranged around the observation window.
The endoscope according to any one of claims 1 to 5, wherein the second light emitting unit is arranged between the first light emitting units.
The endoscope according to claim 6, wherein the first light emitting unit and the second light emitting unit are respectively arranged at equal distances from the optical axis of the observation window.
Equipped with a lighting board for endoscopes
The lighting substrate for an endoscope is
The first layer in which the light emitting element included in the first light emitting unit is mounted on the first surface, and
The endoscope according to any one of claims 1 to 7, which is laminated on the first surface and has a second layer on which a light emitting element included in the second light emitting unit is mounted.
Equipped with a lighting board for endoscopes
The light emitting element included in the first light emitting unit is mounted on the first surface of the endoscope illumination substrate.
The endoscope according to any one of claims 1 to 7, wherein the light emitting element included in the second light emitting unit is mounted on the first surface via a spacer.
The lighting substrate for an endoscope is
It is an annular shape that surrounds the observation window.
The endoscope according to claim 8 or 9, wherein a cable connection portion arranged along the edge of a hole surrounding the observation window is provided on the mounting surface side.
The endoscope according to any one of claims 8 to 10, wherein the illumination substrate for an endoscope has an arcuate concave portion on a peripheral edge portion.
The lighting substrate for an endoscope is
The endoscope according to any one of claims 8 to 11, which includes a support plate laminated on the second surface.