CN114760905A

CN114760905A - Endoscope and method for operating the same

Info

Publication number: CN114760905A
Application number: CN202080074142.6A
Authority: CN
Inventors: 小师敦
Original assignee: Hoya Corp
Current assignee: Hoya Corp
Priority date: 2019-12-25
Filing date: 2020-11-20
Publication date: 2022-07-15
Also published as: JP2021101960A; JP7516041B2; WO2021131447A1; WO2021131447A8

Abstract

The invention provides an endoscope and the like capable of preventing crosstalk between a plurality of light emitting parts. The endoscope is provided with an observation window arranged at the front end of an insertion part and an illumination part for illuminating the visual field direction of the observation window, wherein the illumination part is provided with a first light-emitting part (519) for emitting wide-band light and a second light-emitting part (529) which is arranged at the front end side of the first light-emitting part (519) and emits narrow-band light. The first light-emitting section (519) includes a light-emitting element and a phosphor-containing resin covering the light-emitting element.

Description

Endoscope with a detachable handle

Technical Field

The present invention relates to an endoscope.

Background

There is proposed an endoscope in which a white light emitting portion and a narrow band light emitting portion are alternately arranged on a circumference (patent document 1). The white light emitting section is used for illumination in ordinary light observation. The narrow-band light emission section is used for illumination in observation of special light.

Documents of the prior art

Patent literature

Patent document 1: japanese patent laid-open publication No. 2005-74034

Disclosure of Invention

Problems to be solved by the invention

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

In one aspect, the present invention is directed to an endoscope and the like that prevents crosstalk from occurring between a plurality of light emitting sections.

Means for solving the problems

The endoscope includes an observation window disposed at a distal end of an insertion portion, and an illumination portion that illuminates a visual field direction of the observation window, the illumination portion including a first light-emitting portion that emits broad-band light, and a second light-emitting portion that is disposed at a distal end side from the first light-emitting portion and emits narrow-band light.

Effects of the invention

In one aspect, the present invention can provide an endoscope and the like that prevent crosstalk between a plurality of light emitting sections.

Drawings

Fig. 1 is an external view of an endoscope.

Fig. 2 is a view of the arrow II in fig. 1.

Fig. 3 is a view of the arrow III in fig. 2.

Fig. 4 is a partial sectional view of the endoscope taken along line IV-IV of fig. 2.

Fig. 5 is a partial sectional view of the endoscope taken along line V-V of fig. 2.

Fig. 6 is a sectional view of the endoscope taken along line VI-VI of fig. 4.

Fig. 7 is a sectional view of the endoscope taken along line VII-VII of fig. 4.

Fig. 8 is a perspective view of the illumination substrate for an endoscope.

Fig. 9 is a front view of the illumination substrate for an endoscope.

Fig. 10 is a partial cross-sectional view of the illumination substrate for an endoscope taken along the X-X line of fig. 9.

Fig. 11 is a partial cross-sectional view of the illumination substrate for an endoscope taken along line XI-XI of fig. 9.

Fig. 12 is a partial cross-sectional view of the illumination substrate for an endoscope taken along line XII-XII in fig. 9.

Fig. 13 is a partial sectional view of the illumination substrate for an endoscope according to embodiment 2.

Fig. 14 is a partial cross-sectional view of an illumination substrate for an endoscope according to a modification of embodiment 2.

Fig. 15 is a partial sectional view of the illumination substrate for an endoscope according to embodiment 3.

Fig. 16 is a partial sectional view of the illumination substrate for an endoscope according to embodiment 4.

Detailed Description

[ embodiment 1]

Fig. 1 is an external view of an endoscope 10. The endoscope 10 of the present embodiment is a soft lens for the digestive tract. The endoscope 10 includes an insertion portion 14, an operation portion 20, a universal cord 25, and a connector portion 24. The operation section 20 has a bending knob 21 and a passage entrance 22.

The insertion portion 14 is elongated, and one end is connected to the operation portion 20 via the bent stopper portion 16. The insertion portion 14 includes a flexible portion 11, a bending portion 12, and a distal end portion 13 in this order from the operation portion 20 side. The bending portion 12 is bent in accordance with the operation of the bending knob 21.

A passage 15 is provided through the insertion portion 14 from the passage inlet 22 to the distal end 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 is referred to as an insertion direction. Likewise, a side closer to the operation portion 20 in the insertion direction is referred to as an operation portion side, and a side away from the operation portion 20 is referred to as a leading end side.

The universal cord 25 is elongated with a first end connected to the operating portion 20 and a second end connected to the connector portion 24. The connector portion 24 is covered with a connector housing 26 having a substantially rectangular parallelepiped shape. The scope connector 27 protrudes from one surface of the connector housing 26. The connector portion 24 is connected to a processor for an endoscope, which is not shown.

Fig. 2 is a view of the arrow II in fig. 1. Fig. 3 is a view of the arrow III in fig. 2. Fig. 2 shows a state in which the end face of the insertion portion 14 is viewed from the front. Fig. 3 shows a side surface of the distal end portion 13.

As shown in fig. 2, the observation window 36 is arranged at a position offset upward in fig. 2 from the center axis of the insertion portion 14. As shown in fig. 3, the viewing window 36 is dome-shaped. The annular illumination window 39 is disposed so as to surround the observation window 36. The details of the illumination window 39 will be described later.

In fig. 2, an air/water supply nozzle 37 is disposed at the lower right of the observation window 36, and its outlet port faces the observation window 36. A tunnel outlet 152 and a front water supply hole 38 are disposed on the lower left of the observation window 36.

Further, fig. 2 is only one example of the end surface appearance of the front end portion 13, and the arrangement of the respective members is not limited to fig. 2. For example, a separate air supply nozzle and water supply nozzle may be provided instead of the air supply and water supply nozzle 37.

As shown in fig. 3, the distal end portion 13 includes a first frame 31 and a second frame 32 from the distal end side. The lower half of the first frame 31 in fig. 3, i.e., the portion provided with the air and water supply nozzle 37, the passage outlet 152, and the front end water supply hole 38, is substantially conical.

The first frame 31 has a protruding portion 311 protruding toward the operation portion side on the upper side in fig. 3. The portion of the distal end side end of the second frame 32 corresponding to the protruding portion 311 recedes toward the operation portion side. The protruding portion 311 engages with the recessed portion of the second frame 32, thereby limiting the angle between the first frame 31 and the second frame 32 in the rotational direction.

The fourth frame 34 is fixed to the operation portion side of the second frame 32. A bending piece 122 indicated by a two-dot chain line in fig. 3 is fitted into and fixed to the fourth frame 34. The operation portion side portion of the second frame 32 and the bending piece 122 are covered with the bending rubber 121.

Fig. 4 is a partial sectional view of endoscope 10 taken along line IV-IV of fig. 2. Fig. 5 is a partial sectional view of the endoscope 10 taken along line V-V of fig. 2. Fig. 6 is a sectional view of the endoscope 10 taken along line VI-VI of fig. 4. Fig. 7 is a sectional view of the endoscope 10 taken along line VII-VII of fig. 4. In fig. 4 and 5, the bending piece 122 and the bending rubber 121 are not illustrated.

The first frame 31, the second frame 32, and the fourth frame 34 are cylindrical. The cylindrical third frame 33 is housed inside the first frame 31 and the second frame 32. The third frame 33 is a stepped cylindrical shape having a thick front end and a thin operation portion. As shown in fig. 7, the third frame 33 has a circular outer side and a rectangular inner side in cross section. The dimension of the inner rectangle is substantially the same over the entire length of the third frame 33.

The illumination substrate 41 for a ring-shaped endoscope is disposed on the distal end side end surface of the third frame 33. As shown in fig. 6, the first light-emitting portion 519 and the second light-emitting portion 529 which emit illumination light are disposed in the periphery of the distal end side surface of the endoscope illumination substrate 41. The second light emitting portion 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 portion 519 and the second light emitting portion 529 are examples of an illumination portion that illuminates the visual field direction in the present embodiment.

The details of the structure of the illumination substrate 41 for an endoscope 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 violet light-emitting element 522, only the light-emitting element 50 (see fig. 9) will be described.

The first frame 31 is made of a light-transmitting resin for transmitting light emitted from the light-emitting element 50. As shown in fig. 5, a portion of the inner surface of the first frame 31 facing the light emitting element 50 is recessed in a U-shaped groove 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 with the second layer 62 (refer to fig. 8), as shown in a in fig. 5, the light emitted from the light emitting element 50 illuminates a wide range from the front to the side of the insertion portion 14.

The portion that transmits light emitted from the light emitting element 50 of the first frame 31 has a function of the illumination window 39. The front end portion of the first frame 31 may be formed of a light-transmitting resin, and the other portions may be formed of a light-impermeable resin. The front end portion of the first frame 31 may be formed of any translucent material such as a translucent resin or a translucent ceramic, and the other portion may be formed of any material such as a resin, a metal, or a ceramic.

The cylindrical fifth frame 35 is inserted into the illumination substrate 41 for an endoscope and the third frame 33. As shown in fig. 6, the outer side of the cross section of the fifth frame 35 on the tip side is substantially D-shaped with the straight portion facing the side of the passage outlet 152, and the outer side of the cross section of the operation portion side is rectangular as shown in fig. 7. The holes penetrating the fifth frame 35 in the length direction have a circular cross section of the same thickness.

As shown in fig. 6, two cable grooves 351 extending in the longitudinal direction of the fifth frame 35 are provided in the substantially D-shaped curved portion of the fifth frame 35. The two cable grooves 351 are configured to be substantially symmetrical. The bottom of the cable groove 351 is substantially flush with the short-side surface of the rectangular cross section described with reference to fig. 7.

The description is continued with reference to fig. 4 and 5. In the fifth frame 35, a lens unit 361 is inserted from the front end side. The lens unit 361 has a lens frame 364 and a plurality of lenses fixed to the lens frame 364. The edge of the foremost end side lens among the lenses constituting the lens unit 361 and the edge of the hole of the first frame 31 are arranged to be smoothly continuous. The observation window 36 is an outer surface of the lens disposed on the most distal side.

The lens unit 361 of the present embodiment is a so-called super wide angle lens having an angle of view exceeding 150 degrees. The lens unit 361 has a large-diameter lens on the front end side and a small-diameter lens on the operation portion side. The lens frame 364 has a cylindrical shape having a flange on the distal end side. A large-diameter front end lens is fixed to a flange portion of the lens frame 364, and a small-diameter operation unit lens is fixed to an inner surface of the lens frame 364.

The image pickup unit 362 is disposed on the operation unit side of the lens unit 361. The imaging unit 362 is a member that fixes the imaging element 363, the driving circuit, and the cables connected thereto, which are disposed on the end surface on the distal end side, in a substantially rectangular parallelepiped shape. The image pickup unit 362 has an image pickup cable 365 extending along the operation section side. The imaging cable 365 is a bundle of a plurality of cables. The imaging 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 light incident on the lens unit 361 forms an image on the image pickup element 363. The lens unit 361 and the imaging unit 362 constitute an observation optical system of the endoscope 10.

Through holes corresponding to the passage outlet 152, the air and water supply nozzle 37, and the front end water supply hole 38 are provided in the first frame 31, respectively. As shown in fig. 4, the through hole corresponding to the passage outlet 152 is a stepped hole having a larger inner diameter on the operation portion side, and is connected with a passage tube 151.

Although not shown, a front end water supply pipe is connected to a through hole corresponding to the front end water supply hole 38. The air and water supply nozzles 37 are attached to the front end side of the through-holes corresponding to the air and water supply nozzles 37, and the air supply pipe and the water supply pipe are attached to the operation portion side.

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

As described above, the illumination substrate 41 for an endoscope has a ring shape. The substantially D-shaped imaging hole 411 is provided in the center of the endoscope illumination board 41. A substantially circular arc-shaped channel recess 412 is provided on the outer periphery of the illumination substrate 41 for an endoscope in the vicinity of the linear portion of the imaging hole 411.

The illumination substrate 41 for an endoscope is a so-called multilayer PCB (Printed Circuit Board) in which a plurality of wiring layers and insulating layers are laminated. The illumination substrate 41 for an endoscope 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 insulating layers.

On the first layer 61, 8 first light-emitting elements 51 are mounted at substantially equal intervals along the outer periphery of the illumination substrate 41 for an endoscope. The channel recess 412 is configured to be located between adjacent two first light emitting elements 51.

Three wiring boards 44 are arranged between the second first light emitting element 51 and the third first light emitting element 51 from the respective first light emitting elements 51 located on both sides of the passage recess 412, respectively. The 2-assembly wiring board 44 is arranged to face each other with the imaging hole 411 interposed therebetween. The wiring board 44 is an example of the cable connection unit of the present embodiment.

The second layer 62 is laminated on the first layer 61 except for a position where the first light emitting element 51 is mounted and a vicinity thereof, and a position where the wiring board 44 is arranged and a vicinity thereof. The end surface of the second layer 62 surrounds the periphery of the first light-emitting element 51 in the vicinity of the position where the first light-emitting element 51 is mounted, and forms a U-shaped wall 621 that opens on the outer peripheral side of the illumination substrate 41 for an endoscope.

Near the position where the interconnection board 44 is arranged, the end face of the second layer 62 surrounds the periphery of the 3 interconnection boards 44, and forms a U-shaped connecting portion wall surface 432 that opens on the inner peripheral side of the illumination substrate 41 for an endoscope.

In the second layer 62, 4 second light emitting parts 529 are arranged. The second light emitting part 529 includes a green light emitting element 521 and a violet light emitting element 522 which are disposed adjacent to each other along the outer periphery of the endoscope illumination substrate 41. The second light emitting portion 529 is disposed at a position spaced apart from each other between two adjacent first light emitting elements 51. At the position where second light emitting unit 529 is disposed, neither channel recess 412 nor wiring board 44 is disposed.

Each of the first light-emitting elements 51 is disposed at a substantially equal distance from the optical axis of the observation optical system including the imaging unit 362 and the lens unit 361. Each of the second light emitting parts 529 is also arranged at a substantially equal distance from the optical axis of the observation optical system including the imaging unit 362 and the lens unit 361.

As shown in fig. 5, the illumination substrate 41 for an endoscope is mounted on 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 distal end side.

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

Fig. 10 includes two first light emitting portions 519 and a second light emitting portion 529 disposed therebetween, and shows a cross section of the illumination substrate 41 for an endoscope cut by an arc-shaped curve substantially parallel to the outer periphery of the illumination substrate 41 for an endoscope. Fig. 11 shows a cross section of the illumination substrate 41 for an endoscope cut by a surface extending in the radial direction through one first light-emitting portion 519. Fig. 12 shows a cross section of the illumination substrate 41 for an endoscope cut by a surface extending in the radial direction through one green light emitting element 521.

In fig. 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 an endoscope, and the wiring pattern provided on the wiring layer are not illustrated.

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

As shown in fig. 10 and 12, each light emitting element 50 constituting the second light emitting portion 529 is mounted on the surface of the second layer 62. That is, each light emitting element 50 constituting the second light emitting portion 529 is arranged on the upper side in fig. 10 to 12 than the surface of the fluorescent resin 511.

Although not shown, wiring for connecting the pads to the wiring board 44 is formed on the endoscope illumination substrate 41, and the light emitting elements 50 are mounted on the pads, respectively.

Returning to fig. 7, the description is continued. The illumination cable 332 extends from the endoscope processor to the distal end portion 13 via the connector portion 24, the universal cord 25, and the operation portion 20. The illumination cable 332 is a bundle of a plurality of cables. In fig. 7, the illumination cable 332 is disposed on the left side of the fifth frame 35.

At the front end 13, the illumination cable 332 is split into two groups of cable bundles. One cable bundle is led out to the vicinity of the left side distribution board 44 via the cable groove 351 on the left side in fig. 6. The other cable harness is routed through the substantially U-shaped wiring duct 331 provided in the third frame 33, and then drawn out to the vicinity of the right distribution board 44 through the right cable duct 351 in fig. 6.

The respective wires constituting the illumination cable 332 are connected to the wiring board 44 by any method such as soldering. In fig. 6, the wires connected to the respective wiring boards 44 are not shown. The light emission of the light emitting element 50 is controlled by the processor for an endoscope via the illumination cable 332.

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

The following techniques have been developed: white light as broadband light is obtained by irradiating narrow-band light emitted from the semiconductor light emitting element to the phosphor, and mixing and emitting fluorescent light emitted from the phosphor with light emitted from the semiconductor light emitting element. For example, it is known that white light can be obtained by the combination shown in table 1.

[ Table 1]

Numbering	Color of light emitting element	Color of phosphor
			1	Blue color	Yellow colour
2	Near ultraviolet light	Red + green + blueColor(s)

In the present embodiment, a combination of No.1 is used as the first light-emitting element 51. That is, the fluorescent resin 511 of the present embodiment is a resin in which a yellow fluorescent material is mixed with a translucent resin, and the first light-emitting element 51 is a blue LED.

The combination of No.2 in table 1 or any other combination of colors of the light emitting element 50 and the phosphor can be used to obtain illumination light suitable for observation with normal light.

The illumination light for observing special light emitted from the second light emitting unit 529 will be described below. The special light observation is a technique of highlighting, for example, a blood vessel or the like passing through the deep part of a mucous membrane by using narrow-band illumination light. For example, a method using illumination light shown in table 2 is proposed.

[ Table 2]

Numbering	Color of light emitting element
		1	Combination of blue + green
2	Purple color
		3	Combination of Green + Violet
4	Combination of blue + green + red

Each color shown in table 2 is preferably narrow-band light with a narrow band. The second light emitting portion 529 can use a semiconductor light emitting element such as an LED or a semiconductor laser. In this embodiment, a combination of No.3 (using the green light-emitting element 521 and the violet light-emitting element 522) will be described as an example.

The description is continued with reference to fig. 10. When normal light observation is performed, first light-emitting element 51 is turned on, and light-emitting element 50 constituting second light-emitting portion 529 is turned off. The light emitted from the first light emitting element 51 is changed into white light by the fluorescent material in the fluorescent resin 511, and is irradiated from the illumination window 39 to the front and the side. That is, the first light emitting section 519 emits illumination light for normal light observation.

When the special light observation is performed, first light-emitting element 51 is turned off and light-emitting element 50 constituting second light-emitting portion 529 is turned on. The light emitted from second light emitting portion 529 is emitted forward and laterally from illumination window 39.

If light emitted from the second light emitting part 529 enters the fluorescent resin 511, crosstalk occurs and the fluorescent resin 511 emits light. That is, the first light emitting portion 519 is in a pseudo light emitting state even during the special light observation period.

However, the light emitting element 50 constituting the second light emitting portion 529 is mounted on the surface of the second layer 62 as described above. Light emitted from the second light emitting portion 529 is not incident on the fluorescent resin 511, and is in a state of being embedded in the second layer 62. Thereby, crosstalk in which light emitted from the second light emitting part 529 is incident on the fluorescent resin 511 and emits light can be prevented or suppressed.

According to the present embodiment, the endoscope 10 can be provided that prevents crosstalk from occurring between the plurality of light emitting sections. Since the white observation illumination light does not cause crosstalk due to the special light observation illumination, the image quality in special light observation is improved.

According to the present embodiment, since light emitted from the side surface of the light emitting element 50 disposed around the observation window 36 is not blocked, it is possible to provide the endoscope 10 which is always irradiated to 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 an 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, formation of a metal film, or the like. The endoscope 10 can be provided in which white light emitted from the first light emitting portion 519 can brightly illuminate the side of the insertion portion 14.

Since the first light emitting portion 519 and the second light emitting portion 529 are arranged evenly around the observation window 36, the endoscope 10 with less luminance unevenness can be provided. Since the green light emitting element 521 and the purple light emitting element 522 are disposed adjacent to each other, the endoscope 10 with less color unevenness of the illumination for special light observation can be provided.

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

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

In the case of using the endoscope 10 having a wide observation field of view in the present embodiment and the like, the illumination light for ordinary light observation must be irradiated to the side of the insertion portion 14. The user can observe a wide range at the same time to find a diseased part.

When performing special light observation in an endoscopic examination, a user operates the endoscope 10 to secure a portion of interest in the central portion of the field of view of the endoscope. Therefore, the illumination light for special light observation emitted from the second light emitting part 529 is preferably focused on the central part of the field of view. The central part of the visual field can be brightly irradiated without the illumination light spreading to the peripheral part of the visual field.

The light emitted from the first light-emitting portion 519 is surely spread over a wide range, and the light emitted from the second light-emitting portion 529 is emitted strongly toward the front of the insertion portion 14, so that it is possible to provide the endoscope 10 that illuminates ranges respectively suitable for normal light observation and special light observation.

Since the channel recess 412 is provided on the outer periphery of the illumination substrate 41 for an endoscope, the observation window 36 and the channel outlet 152 can be arranged adjacent to each other. This can provide an endoscope 10 in which the diameter of the distal end portion 13 is reduced.

The endoscope 10 may be disassembled by case, and any members such as the illumination substrate 41 for an endoscope, the lens unit 361, and the image pickup unit 362 may be reused as appropriate.

[ embodiment 2]

The present embodiment relates to an endoscope 10 in which a semiconductor light emitting element and a phosphor are sealed in one package, and a so-called white light emitting element is used as a first light emitting element 51. The portions common to embodiment 1 will not be described.

Fig. 13 is a partial sectional view of an illumination substrate 41 for an endoscope according to embodiment 2. Fig. 13 shows a partial cross section at the same position as fig. 10.

Since the semiconductor light emitting element and the phosphor are packaged, 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.

The first light emitting element 51 is mounted on the first layer 61. The height T1 to the surface of the second layer 62 is higher than the height T2 of the first light emitting element 51 with the surface of the first layer 61 as a reference. As shown by arrows in fig. 13, even in the case of using the green light-emitting element 521 and the violet light-emitting element 522 which emit light also to the direction parallel to the mounting surface, having very wide orientation angles, the illumination light emitted from these light-emitting elements 50 does not cause crosstalk of the first light-emitting element 51.

Fig. 14 is a partial cross-sectional view of an illumination substrate 41 for an endoscope according to a modification of embodiment 2. Fig. 14 shows a partial cross section at the same position as fig. 10.

In the modification 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, the semiconductor light emitting element is generally narrower in orientation angle than a light emitting body such as a bulb. Therefore, light in a direction parallel to the mounting surface as shown by a dotted line in fig. 14 is hardly emitted.

Therefore, as shown in fig. 14, even if the height T1 is lower than the height T2, 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 as the first light-emitting element 51. Since the fluorescent resin 511 does not need to be coated after the first light emitting element 51 is mounted, the assembly of the illumination substrate 41 for an endoscope is easy.

[ embodiment 3]

The present embodiment relates to an endoscope 10 in which a light emitting element 50 constituting a second light emitting portion 529 is attached via a spacer 527. The portions common to embodiment 1 are not described.

Fig. 15 is a partial sectional view of an illumination substrate 41 for an endoscope according to embodiment 3. Fig. 15 shows a partial cross section at the same position as fig. 10.

In this embodiment, the green light emitting element 521 and the purple light emitting element 522 are mounted on the first layer 61 through a spacer 527. The spacer 527 is attached to the green light emitting element 521 and the purple light emitting element 522 in advance, for example, and is formed integrally therewith. The green light emitting element 521 and the purple light emitting element 522 may be mounted on 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 a connecting member provided in the spacer 527. Further, the first light-emitting element 51 and the spacer 527 may be mounted on the first layer 61, and then the green light-emitting element 521 and the purple light-emitting element 522 may be mounted on the spacer 527.

According to the present embodiment, since it is not necessary to laminate 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 illumination substrate 41 for an endoscope. The portions common to embodiment 1 are not described.

Fig. 16 is a partial sectional view of an illumination substrate 41 for an endoscope according to embodiment 4. Fig. 16 shows a partial cross section at the same position as fig. 10.

The illumination substrate 41 for an endoscope of the present embodiment is a laminate of the first layer 61, the second layer 62, and the support plate 429. The first layer 61 uses a thin substrate. The first layer 61 may be a so-called FPC (Flexible printed circuit) 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. A 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 for supporting the first layer 61 and the second layer 62 and preventing disconnection due to bending or the like. The support plate 429 is a metal plate made of copper, aluminum, stainless steel, or the like, for example. The support plate 429 may be a ceramic plate or a resin plate. When the support plate 429 is conductive, an insulating layer having no pattern or the like is disposed on the side of the first layer 61 in contact with the support plate 429.

According to the present embodiment, the endoscope 10 in which disconnection or the like of the illumination substrate 41 for an endoscope is less likely to occur during assembly work can be provided.

Further, by using a highly heat conductive material such as metal for the support plate 429, the endoscope 10 can quickly diffuse heat generated by the light emitting element 50. Since heat can be quickly diffused in the illumination substrate 41 for an endoscope, the illumination substrate 41 for an endoscope can be prevented from being overheated by disposing a heat sink or a cooling element at an arbitrary position of the illumination substrate 41 for an endoscope.

The technical features (structural requirements) described in the respective embodiments may be combined with each other, and new technical features may be formed by combination.

It should be understood that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is shown by the claims rather than the above meaning, and is intended to include all modifications within the meaning and scope equivalent to the claims.

Description of the symbols

10 endoscope

11 Flexible part

12 bending part

121 bending rubber

122 bending block

13 front end part

14 insertion part

15 channel

151 channel tube

152 channel outlet

16 stop bending part

20 operating part

21 bending knob

22 channel entrance

23 pliers bolt

24 connector part

25 universal flexible cord

26 connector housing

27 observer connector

31 first frame

311 projection

32 second frame

33 third frame

331 wiring slot

332 lighting cable

34 fourth frame

35 the fifth frame

351 cable trough

36 observation window

361 lens unit

362 image pickup unit

363 image pickup element

364 lens frame

365 Camera cable

37 air and water supply nozzle

38 front end water supply hole

39 lighting window

41 Lighting substrate for endoscope

411 shooting hole

412 channel recess

429 supporting plate

432 connecting portion wall surface

44 distribution board

50 light emitting element

51 first light emitting element

511 fluorescent resin

519 first light-emitting part

521 green light emitting element

522 purple light emitting element

527 spacer

529 second light emitting part

61 first layer

62 second layer

621U-shaped wall.

Claims

1. An endoscope, comprising:

an observation window disposed at the tip of the insertion portion, an

An illumination unit that illuminates a viewing direction of the observation window;

the illumination unit includes:

a first light-emitting part emitting broadband light, and

and a second light-emitting unit which is disposed on the front end side of the first light-emitting unit and emits narrow-band light.

2. The endoscope of claim 1,

the first light emitting portion includes:

light emitting element, and

and a phosphor-containing resin covering the light emitting element.

3. The endoscope of claim 1,

the first light emitting portion includes a white light emitting element.

4. The endoscope of any one of claims 1 to 3,

the second light-emitting portion includes a purple light-emitting element or a green light-emitting element.

5. The endoscope of any one of claims 1 to 3,

the second light emitting section includes a blue light emitting element or a green light emitting element.

6. The endoscope of any one of claims 1 to 5,

a plurality of first light-emitting units are arranged around the observation window,

the second light-emitting portion is disposed between the first light-emitting portions.

7. The endoscope of claim 6,

the first light emitting unit and the second light emitting unit are arranged at equal distances from the optical axis of the observation window.

8. The endoscope of any one of claims 1 to 7,

comprises an illumination substrate for an endoscope,

the illumination substrate for an endoscope includes:

a first layer in which light emitting elements included in the first light emitting part are mounted on a first surface, an

And a second layer laminated on the first surface and having the light emitting element included in the second light emitting section mounted thereon.

9. The endoscope of any one of claims 1 to 7,

comprises an illumination substrate for an endoscope,

a light emitting element included in the first light emitting unit is mounted on a first surface of the illumination substrate for an endoscope,

the light emitting element included in the second light emitting section is mounted on the first surface via a spacer.

10. The endoscope of claim 8 or 9,

the illumination substrate for endoscope

Is in a ring shape surrounding the observation window,

the mounting surface side is provided with a cable connection portion arranged along an edge of a hole surrounding the observation window.

11. The endoscope of any one of claims 8-10,

the illumination substrate for an endoscope has an arc-shaped recess in a peripheral portion.

12. The endoscope of any one of claims 8-11,

the illumination substrate for endoscope

Including a support plate laminated on the second face.