JP5646356B2 - Endoscope - Google Patents

Description

  The present invention relates to an endoscope in which a light emitting element is disposed at a distal end portion of an insertion portion as an illumination optical system.

  Endoscopes are widely used in the medical field and the industrial field. In an endoscope, the object of diagnosis or observation is in a living body, a plant, or the like. For this reason, when performing endoscopic observation, a light source that illuminates the observation target is required.

  A general endoscope apparatus includes an endoscope and a light source device as an external device of the endoscope. Illumination light emitted from the light source device is supplied to a light guide provided in the endoscope. The supplied illumination light is transmitted by a light guide and emitted through an illumination window disposed at the distal end of the insertion portion of the endoscope to illuminate the observation target.

  For example, Patent Document 1 discloses an endoscope that can obtain a sufficient amount of light and good light distribution, can prevent loss of the amount of light, and has a thin tip. In this endoscope, the distal end portion is formed by a transparent transparent member that transmits illumination light. The distal end portion is provided with an insertion portion for inserting the observation optical system and an insertion portion for inserting the light guide fiber. Further, a lens system is formed at the distal end of the insertion portion to diffuse illumination light irradiated from the distal end of the light guide fiber, transmit the distal end portion, and enter the inclined surface portion.

  According to this endoscope, the distal end portion is formed of a transparent member, the light guide fiber is held at the distal end portion, and the inner peripheral surface on the distal end surface side is formed into a lens system shape instead of providing the lens system at the distal end. By forming and forming a slope portion on the periphery of the front end surface, the irradiation light is diffused into the lens system and incident on the slope portion, and the irradiation light is deflected toward the longitudinal central axis in the slope portion.

  In Patent Document 1, it is described that the illumination unit is not limited to the light guide fiber, the LED is used, and the inclined surface is not limited to the arc shape, but is linear.

  An endoscope 1 shown in FIG. 1 includes a pair of illumination optical units 3 on a distal end surface configured in a plane, for example, in a positional relationship facing each other with an observation optical unit 2 interposed therebetween. The illumination optical unit 3 includes a front end cover 4 formed of a transparent resin member, and a light emitting unit 5a of the light emitting element 5 disposed on the cover base end side surface 4b. In the endoscope 1, the illumination light emitted from the light emitting unit 5 a passes through the tip cover 4 and is emitted from the illumination window 4 a on the tip surface to illuminate the observation target.

JP 2009-207529 A

However, in the endoscope of Patent Document 1, a dome-shaped air gap is formed between the front end of the light guide and the transparent member in order to diffuse the illumination light irradiated from the front end of the light guide that is a light source. If this air gap exists, the total light quantity decreases due to light attenuation.
In the endoscope 1 of FIG. 1, the observation range (angle θ2) of the observation optical unit 2 is 145 degrees indicated by a thick two-dot chain line, and the emission of the illumination light emitted from the illumination window unit 4a constituted by a plane. When the angle θ1 is 130 degrees as indicated by, for example, a thin two-dot chain line, when the distance from the tip surface of the tip cover 4 exceeds L1, the observation range is located outside the emission angle of the illumination light. Then, the brightness of the observation range becomes dark at the hatched portion indicated by the oblique lines in the drawing, that is, the periphery of the observation range. For this reason, when the observation site is a large space such as the inside of the stomach, the observation may be hindered if the distance to the observation site exceeds L1.

  In order to ensure the brightness of the periphery of the observation range, for example, it is conceivable to increase the amount of light by increasing the current value applied to the light emitting element. However, the amount of heat generated in the illumination optical unit increases as the applied current increases. Then, the temperature of the tip increases, and there is a possibility that good endoscopic observation cannot be performed for a long time due to a decrease in the amount of illumination light or generation of image noise.

  The present invention has been made in view of the above circumstances, at the time of observation when the light emitting element is turned on, without attenuating the illumination light irradiated from the light emitting element, and without increasing the amount of heat generated from the light emitting element, An object of the present invention is to provide an endoscope capable of observing while ensuring the brightness around the observation range.

An endoscope according to one aspect of the present invention includes a cylindrical tip cover formed of a transparent resin member that constitutes the tip of the endoscope, and an observation optical unit disposed in an opening provided in the tip cover And an illumination optical part configured by disposing a light emitting part emitting end face of a light emitting element on the base end face side of the tip cover, and the tip through which the illumination light emitted from the light emitting part emitting end face is transmitted The cover is formed by stacking a first resin member and a second resin member different from the first resin member by two-color molding, and the first resin member and the second resin member interface, the placed in front of the light emitting portion emitting end face is an inclined plane distance from the plane of the tip cover that continuously Tozaka toward the tip cover the outer peripheral side.

  According to the present invention, it is possible to realize an endoscope that can perform observation while ensuring the brightness of the periphery of the observation range without increasing the amount of heat generated in the illumination optical unit during observation with the light emitting element turned on.

It is a figure which concerns on a prior art, and is a figure explaining the relationship between the emission angle of illumination light, and the observation range of an observation optical part in the case of having a dark part in the periphery of an observation range in an endoscope provided with a light emitting element as an illumination part FIG. 4 is a diagram related to the present embodiment, and is a diagram illustrating a distal end cover that is a distal end surface of the distal end portion that constitutes the insertion portion of the endoscope and includes an inclined surface portion on the distal end surface. FIG. 3 is a cross-sectional view taken along line Y3-Y3 in FIG. FIG. 3 is a cross-sectional view taken along line Y4-Y4 of FIG. FIG. 3 is a cross-sectional view taken along line Y4-Y4 of FIG. It is a figure which concerns on this embodiment, and is a figure explaining the difference in the observation range peripheral part of the endoscope which equips a plane with an illumination window part, and the endoscope which has an illumination window part in an inclined surface part. The figure which concerns on this embodiment and is a figure explaining the endoscope provided with one illumination window part in the front end surface of the front-end | tip part of an endoscope The figure explaining the endoscope which equips the front end surface of the front-end | tip part of an endoscope with four illumination window parts. One explanatory view of the tip cover explaining the starting position of the inclined surface portion Other explanatory drawings of the tip cover explaining the starting position of the inclined surface portion Another explanatory view of the tip cover explaining the start position of the inclined surface portion The figure explaining one structural example of the front-end | tip cover which provided the inclined surface part in the middle of the optical path The figure explaining the other structural example of the front-end | tip cover which provided the inclined surface part in the middle of the optical path

Embodiments of the present invention will be described below with reference to the drawings.
The tip cover provided in the endoscope will be described with reference to FIGS.
As shown in FIGS. 2 and 3, the endoscope 10 according to the present embodiment has an elongated insertion portion 11, and a cleaning nozzle 14 and an observation window are provided on the distal end surface 12 a of the distal end portion 12 constituting the insertion portion 11. 21, an opening 15 a of the treatment instrument insertion hole 15 is provided.
Reference numeral 8 denotes a front end cover, and reference numeral 32 denotes a light emitting part emitting end face provided in the light emitting element 31. The light emitting element 31 is, for example, a light emitting diode. Reference numerals 8d1 and 8d2 denote illumination window parts, which are provided in front of the light emitting part emission end face 32 and on the front end face of the front end cover 8, and emit illumination light that illuminates the observation site.

  As shown in FIG. 3, the insertion portion 11 is configured by connecting a distal end portion 12, a bending portion 13, and a tubular flexible tube portion (not shown) in order from the distal end side. The bending portion 13 is configured to bend in the vertical and horizontal directions, for example, and includes a distal bending piece 13f on the distal end side, and a bending piece 13a and a plurality of bending pieces (not shown) are connected to the proximal end side of the distal bending piece 13f. doing.

The distal end portion 12 includes, for example, a distal end cover 8 made of an insulating member and a distal end rigid member 9 made of a metal member such as stainless steel.
First, the tip cover 8 will be described.
The tip cover 8 is made of, for example, polysulfone, which is a transparent resin member having insulating properties, and is formed in a cylindrical shape as shown in FIG. Polysulfone is suitable as the resin member of the tip cover 8, but polycarbonate, acrylic, cycloolefin polymer, or the like may be used.

As shown in FIGS. 2 and 3, the tip surface 12 a of the tip 12 is a flat surface portion 8 p which is a first surface and is configured as a plane, and inclined surface portions 8 s 1 and 8 s 2 which are second surfaces and are configured as an inclined surface. It is comprised by the front end surface of the front-end | tip cover 8 which has these. In addition, the plane which comprises a 1st surface and a 2nd surface may be a curved surface.
As shown in FIGS. 2 to 4, for example, a first opening 8 a, a second opening 8 b, and a third opening 8 c are provided in the plane portion 8 p.

  The first opening 8a is a through-hole through which the cleaning nozzle 14 is inserted. The first opening 8 a is provided with a convex portion 8 a 1 that defines the direction of the ejection port of the cleaning nozzle 14. The second opening 8b is a through hole in which the first distal end convex portion 9a of FIG. The third opening 8c is a through hole that constitutes the treatment instrument insertion hole 15 shown in FIG. The central axis (not shown) of the through holes constituting the openings 8a, 8b, 8c is parallel to the central axis (not shown) of the tip cover 8.

  The inclined surface portions 8s1 and 8s2 according to the present embodiment are provided on both sides of the flat surface portion 8p. The first inclined surface portion 8s1 is provided at a position corresponding to the upward curve direction that is the upper side in the drawing, and the second inclined surface portion 8s2 is provided at a position corresponding to the downward curve direction that is the lower side in the drawing.

The 1st illumination window part 8d1 is an output surface which radiate | emits illumination light, and is provided in 1st inclined surface part 8s1. The second illumination window portion 8d2 is provided on the second inclined surface portion 8s2.
The inclination angle of the first inclined surface portion 8s1 and the second inclined surface portion 8s2 is θ3. In other words, as the distance L from the inclined surface of the inclined surface portions 8s1, 8s2 to the plane of the flat surface portion 8p approaches the outer periphery of the tip cover 8. For example, it is set as an inclined surface that continuously moves away toward the periphery of the front end portion 12.
And in this embodiment, the whole illumination window part 8d1, 8d2 is contained in each inclined surface part 8s1, 8s2.
In the present embodiment, the inclined surfaces 8 s 1 and 8 s 2 are continuously moved away from the second surface toward the periphery of the distal end portion 12. However, the second surface is not limited to the inclined surface portions 8 s 1 and 8 s 2, and may be configured by a curved surface that continuously moves away toward the periphery of the tip end portion 12. Further, the inclined surface portions 8s1 and 8s2 may be configured to include an inclined surface and a curved surface.

A light emitting element disposition hole 8e in which the light emitting element 31 is disposed is provided on the base end side surface of each of the first illumination window 8d1 and the second illumination window 8d2. The illumination optical unit 30 is configured by the illumination window portions 8d1 and 8d2 and the light emitting elements 31 fixed to the respective light emitting element arrangement holes 8e.
The light emitting element 31 includes a light emitting portion emission end face 32 on one surface side, and a conduction portion 33 on the base end surface side. For example, a ceramic substrate 34 having insulating properties and high thermal conductivity is connected to the conduction portion 33.

In the present embodiment, the light emitting element 31 is disposed at a predetermined position of the light emitting element disposition hole 8e as indicated by an arrow Y4A, and is bonded to the light emitting portion emission end face 32 and the base end side surfaces of the illumination window portions 8d1 and 8d2. Are fixed together without any gaps.
In this fixed state, the light emitting portion emission end face 32 faces the base end side surfaces of the illumination window portions 8d1 and 8d2. And the illumination light radiate | emitted from the light emission part radiation | emission end surface 32 permeate | transmits the inside of the front-end | tip cover 8, and is respectively from the illumination window parts 8d1 and 8d2 containing the inclined surface parts 8s1 and 8s2 provided in the front-end | tip surface of the front end cover 8. It is emitted.

  The conduction part 33 is located on the illumination window part 8d1, 8d2 side of the light emitting element arrangement hole 8e. The conducting portion 33 is covered with a wall portion 8 f that stands up around the conducting portion 33. For this reason, the insulation between the metallic tip rigid member 9 and the conducting portion 33 is ensured by the wall portion 8f.

The light emitting element 31 connected to the substrate 34 as shown by the two-dot chain line is arranged in the light emitting element arrangement hole 8e of the tip cover 8 as shown by the arrow Y4B, and the light emitting part emission end face 32 and the illumination window part are bonded together. The base end side surfaces of 8d1 and 8d2 may be fixed without a gap. Further, the light emitting element 31 may be provided at a predetermined position of the tip cover 8 by integral molding. As a result, the light emitting portion emission end face 32 is provided without a gap on the base end side of the illumination window portions 8d1 and 8d2.
Reference numeral 8 g denotes a distal end rigid member arrangement space in which the distal end side portion of the distal end rigid member 9 is accommodated.

  On the other hand, the distal end rigid member 9 is made of stainless steel, and is provided with a cleaning nozzle 14 and a lens unit 22 and an imaging unit 23 that constitute the observation optical unit 20 as shown in FIGS.

  The lens unit 22 includes a lens frame 24, an observation window 21 disposed in the lens frame 24, and optical lenses 7a-7d, for example. On the other hand, the imaging unit 23 is mainly configured by including an imaging device 25 and an element frame 26. The lens frame 24 and the element frame 26 are formed of a metal member having excellent corrosion resistance and low thermal conductivity, such as stainless steel.

  The imaging device 25 includes a circuit board on which an imaging element 27 and an electronic component (not shown) are mounted. The image sensor 27 is a CCD, a CMOS, or the like. For example, two cover lenses 6 a and 6 b which are optical members are bonded and fixed to the light receiving surface side of the image sensor 27. The cover lenses 6 a and 6 b are disposed on the element frame 26, and the second cover lens 6 b is disposed on the light receiving surface of the image sensor 27. A signal cable 28 in which a plurality of signal lines are gathered extends from the imaging device 25 toward the proximal end side of the insertion portion 11.

  As shown in FIG. 5, the tip rigid member 9 has a tip first convex portion 9a and a tip second convex portion 9b on the tip side of the component main body 9m. The tip first convex portion 9a is arranged in the second opening 8b of the tip cover 8, and the second convex portion 9b is arranged in the tip rigid member arrangement space 8g.

The distal end surface of the distal end first convex portion 9a is set so as to protrude by a predetermined dimension from the distal end surface of the distal end second convex portion 9b. As a result, the distal end surface of the distal end first convex portion 9 a is arranged so as to coincide with the distal end surface of the distal end cover 8, or protrudes from the distal end surface of the distal end cover 8.
This prevents the illumination light emitted from the light emitting part emitting end face 32 of the light emitting element 31 and transmitted through the tip cover 8 from directly entering the observation optical unit 20 through the transparent tip cover 8. Flare can be prevented.

  Further, the distal end rigid member 9 is provided with a first through hole 9c, a second through hole 9d, a third through hole 9e (see FIG. 2), and a fourth through hole 9f. The central axis (not shown) of each through-hole 9c, 9d, 9e, 9f is parallel to the central axis (not shown) of the distal end rigid member 9.

  The first through hole 9c is an observation optical part hole, and has a lens frame hole 9c1 in which the lens frame 24 is fixed and an element frame hole 9c2 in which the element frame 26 is loosely arranged. Yes. The second through hole 9d has a nozzle hole 9d1 to which the cleaning nozzle 14 is fixed and an air / water supply hole 9d2. The 3rd through-hole 9e is a through-hole which comprises the treatment tool penetration hole 15 shown in the said FIG.

  The fourth through hole 9f is an illumination optical part hole 9f1. The illumination optical part holes 9f1 are formed by the number of the light emitting elements 31 provided integrally with the tip cover 8. The illumination optical part hole 9f1 is a hole through which the substrate 34 can pass, and is configured by a round hole or a square hole.

  In the endoscope 10 configured as described above, by supplying power via the power cables 41 and 42 to the light emitting elements 31 of the respective illumination optical units 30 integrally formed with the distal end cover 8, the light emitting elements are provided. 31 emits light. Then, the illumination light emitted from the light emitting portion emission end face 32 is transmitted through the tip cover 8 as shown in the diagram below the central axis CA in FIG. Illuminate.

  In the present embodiment, the first illumination window portion 8d1 is provided on the first inclined surface portion 8s1, and the second illumination window portion 8d2 is provided on the second inclined surface portion 8s2. Therefore, the emission angle θ1 of the illumination light emitted from the illumination window portion 8d1 does not change, and the emission path (exit direction) is changed outside the central axis CA corresponding to the inclination angle θ3.

  As a result, in the endoscope 1 in which the illumination window portion 4a is positioned on a plane, as shown in the diagram above the central axis CA in FIG. 6, when the distance from the distal end surface of the distal end cover 4 exceeds L1, The observation range is positioned outside the emission angle of the illumination light, and the periphery of the observation range indicated by the oblique lines in the figure becomes dark. However, in the endoscope 10 in which the illumination window portions 8d1 and 8d2 are provided on the inclined surface portions 8s1 and 8s2 as in the present embodiment, observation is performed until the distance from the distal end surface of the distal end cover 8 is farther than L1 and exceeds L2. The range is located inside the emission angle of the illumination light.

In this way, by providing the inclined surface portion on the distal end surface of the insertion portion of the endoscope and the illumination window portion on the inclined surface portion, the light is emitted from the light emitting portion of the light emitting element and transmitted through the distal end cover to be transmitted from the distal end surface. By changing the emission path of the emitted illumination light, the illumination light can be emitted to the outer peripheral side from the central axis CA as compared with an endoscope having an illumination window portion on a plane.
Then, by appropriately setting the inclination angle θ3 according to the large space of the observation part, it is possible to solve the problem that the brightness in the observation range becomes dark at the peripheral part of the observation range.
In addition, the adhesive is applied to eliminate the gap between the light emitting part and the illumination window part, and the light emitting element is integrally fixed to the tip cover, or the light emitting element and the tip cover are integrally formed to eliminate the gap. Accordingly, it is possible to prevent the illumination light emitted from the light emitting unit from being attenuated by the presence of the air gap and the illumination light quantity from being reduced.

In addition, in embodiment mentioned above, the structure which provides the illumination window parts 8d1 and 8d2 of the illumination optical part 30 provided with the light emitting element 31 in the front end surface 12a is shown. However, as shown in FIG. 7A, the endoscope 10A may be configured by providing a first illumination window portion 8d1 on a first inclined surface portion 8s1 provided at a position corresponding to the upward direction of the bending direction. Alternatively, as shown in FIG. 7B, the endoscope 10B is configured by providing illumination window portions 8d1, 8d2, 8d3, and 8d4 respectively on the inclined surface portions 8s1, 8s2, 8s3, and 8s4 provided at positions corresponding to the four bending directions. You may do it.
That is, the number of illumination optical units provided in the endoscope may be one or more.

  Reference numeral 8s3 denotes a third inclined surface portion, which is provided at a position corresponding to the curved right direction on the left side in the drawing. Reference numeral 8s4 denotes a fourth inclined surface portion, which is provided at a position corresponding to the curved left direction on the right side in the drawing. Reference numeral 8d3 denotes a third illumination window part provided on the third inclined surface part 8s3, and reference numeral 8d4 denotes a fourth illumination window part 8d4 provided on the fourth inclined surface part 8s4.

  In the above-described embodiment, the illumination window portions 8d1 and 8d2 are configured to be entirely included in the respective inclined surface portions 8s1 and 8s2. However, as shown in FIG. 7B, even if the configuration includes the inclined surface portion 8s3 in a part of the illumination window portion 8d3 and the configuration includes the fourth inclined surface portion 8s4 in a portion of the fourth illumination window portion 8d4, Compared with an endoscope provided on a plane, the outer peripheral side of the endoscope central axis CA can be illuminated.

  The inclined start position 8ss of the inclined surface portion passes through the endoscope central axis CA as in the inclined surface portion 8s1 of FIG. 7A, for example, on a line dividing the upper direction and the lower direction, or the inclined surface portion 8s1 of FIG. 7B. 8s2 and the second opening side end portion 32a like the inclined surface portion 8s5 of FIG. 8A, or the second opening side end portion 32a of the light emitting portion emitting end surface 32 and the light emitting portion emission like the inclined surface portions 8s3 and 8s4 of FIG. In the region between the center 32c of the end surface 32, or on the center 32c of the light emitting portion emitting end surface 32 as in the inclined surface portion 8s6 in FIG. And the window portion 8d5, 8d6, and 8d7, respectively, in the region between the light emitting portion emission end face 32 and the peripheral edge portion 32b.

  Furthermore, in the above-described embodiment, the inclined surface portions 8 s 1 and 8 s 2 are provided on the distal end surface of the distal end cover 8. However, an inclined surface portion may be provided in the tip cover 8 as shown in FIGS. 9A and 9B.

The tip covers 8A and 8B shown in FIGS. 9A and 9B are transparent resin members that can be formed by superposing the second resin member 82 on the first resin member 81 having a different refractive index. Constructed by color molding.
The refractive index of the first resin member 81 is α, the refractive index of the second resin member 82 is β, and the relationship of refractive index α ≦ refractive index β is set between the refractive index α and the refractive index β. .

  As a combination of the first resin member 81 and the second resin member 82, a combination of acrylic and polycarbonate, a combination of acrylic and cycloolefin polymer, and a combination of cycloolefin polymer and polycarbonate are preferable.

  In the tip cover 8A of FIG. 9A, the second surface is a boundary between the light emitting portion side illumination window portion 83 constituted by the first resin member 81 and the emission surface side illumination window portion 84 constituted by the second resin member 82. The surface 85 is an inclined surface. The inclination start position 8ss of the boundary surface 85 is the front end surface of the front end cover 8A on the second opening 8b side from the second opening side end portion 32a. The inclination end position 8se is the light emitting surface end 31e of the light emitting element 31 on the outer peripheral side of the tip cover from the peripheral end 32b of the light emitting end surface 32. As a result, the tip cover 8A having the boundary surface 85 with the inclination angle θ4, which is disposed in front of the light emitting portion emitting end surface 32 and surely transmits the illumination light emitted from the light emitting portion emitting end surface 32 through the boundary surface 85, is provided. Composed.

  According to the endoscope 10 including the tip cover 8A configured as described above, light is emitted by supplying power to the respective light emitting elements 31 integrally formed with the tip cover 8A via the power cables 41 and 42. The element 31 emits light. Then, the illumination light emitted from the light emission part emission end face 32 is transmitted through the light emission part side illumination window part 83 of the tip cover 8A, the path is changed at the boundary surface 85, and then the emission surface side illumination window part 84 is passed through. The light is transmitted and emitted from the illumination window 86 to illuminate the observation target.

  In the present embodiment, by changing the path of the illumination light at the boundary surface 85, the illumination light can be emitted from the central axis CA to the outer peripheral side as compared with an endoscope having an illumination window portion on a plane. . 9B, the inclination angle of the boundary surface 85 can be appropriately set by moving the inclination end position 8se to the tip surface side of the tip cover 8A rather than the light emitting surface end portion 31e of the light emitting element 31. Is possible.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1 ... Endoscope 2 ... Observation optical part 3 ... Illumination optical part 4 ... Tip cover
4a ... Illuminating window 4b ... Cover base end side surface 5 ... Light emitting element 5a ... Light emitting unit 6a ... First cover lens 6b ... Second cover lens 7a ... Optical lens 8, 8A ... Tip cover 8a ... First opening 8a1 ... Convex Part 8b ... Second opening 8c ... Third opening 8d1 ... First illumination window part 8d2 ... Second illumination window part 8d3 ... Third illumination window part 8d4 ... Fourth illumination window part 8d5, 8d6, 8d7 ... Illumination window part 8e: Light emitting element disposition hole 8f: Wall portion 8g ... Tip rigid member disposition space 8p ... Flat surface portion 8s1 ... First inclined surface portion 8s2 ... Second inclined surface portion 8s3 ... Third inclined surface portion 8s4 ... Fourth inclined surface portion 8s5, 8s6, 8s7: Inclined surface portion 8se ... Inclination end position 8ss ... Inclination start position 9 ... End rigid member 9a ... First end convex portion
9b ... 2nd convex part of a tip 9c ... 1st penetration hole 9c1 ... Hole for lens frames
9c2 ... Element frame hole 9d ... Second through hole 9d1 ... Nozzle hole
9d2 ... Air / water hole 9e ... Third through hole 9f ... Fourth through hole
9f1... Illumination optical part hole 9m... Component part main body 10, 10A, 10B ... Endoscope 11 ... Insertion part 12 ... Tip part 12a ... Tip face 13 ... Bending part 13a ... Bending piece 13f ... Tip bending piece 14 ... Cleaning nozzle DESCRIPTION OF SYMBOLS 15 ... Treatment tool penetration hole 15a ... Opening 20 ... Observation optical part 21 ... Observation window 22 ... Lens unit 23 ... Imaging unit 24 ... Lens frame 25 ... Imaging device 26 ... Element frame 27 ... Imaging element
DESCRIPTION OF SYMBOLS 28 ... Signal cable 30 ... Illumination optical part 31 ... Light emitting element 31e ... Light emission surface edge part 32 ... Light emission part emission end surface 32a ... Opening side edge part 32b ... Periphery side edge part 32c ... Center 33 ... Conducting part 34 ... Substrate 41, 42 ... Power supply cable 81 ... First resin member
82 ... Second resin member 83 ... Light emitting portion side illumination window portion 84 ... Emission surface side illumination window portion 85 ... Boundary surface 86 ... Illumination window portion

Claims (7)

A cylindrical tip cover formed of a transparent resin member constituting the endoscope tip,
An observation optical unit disposed in an opening provided in the tip cover;
An illumination optical unit configured by disposing a light emitting part emitting end surface of a light emitting element on the base end surface side of the tip cover, and
The tip cover through which the illumination light emitted from the light emitting part emission end surface is transmitted is,
A first resin member and a second resin member different from the first resin member are molded by two-color molding,
The boundary surface between the first resin member and the second resin member is disposed in front of the light emitting portion emitting end surface, and the distance from the flat surface of the tip cover is continuous toward the outer periphery side of the tip cover. an endoscope, wherein the manner is an inclined surface that Tozaka. The endoscope according to claim 1, wherein the first resin member and the second resin member have different refractive indexes. The front end cover overlaps an emission surface side illumination window portion constituted by the second resin member on a light emission portion side illumination window portion on which the light emission portion emission end surface constituted by the first resin member is arranged. Configured together,
The refractive index of the first resin member constituting the light emitting portion side illumination window portion alpha, when the refractive index of the second resin member constituting the emitting surface side illumination window portion is beta, the refractive index and the refractive index alpha Between β and
The endoscope according to claim 2, wherein a relationship of refractive index α ≦ refractive index β is set.   The inclination start position of the boundary surface is the cover front end surface on the opening side of the through hole where the front end first convex portion of the front end rigid member is disposed,
  4. The endoscope according to claim 3, wherein the inclination end position of the boundary surface is a light emitting surface end portion of the light emitting element on the outer peripheral side of the tip cover from a peripheral side end portion of the light emitting portion emitting end surface.   The endoscope according to claim 1, wherein a light emitting portion emitting end face of the light emitting element is integrally fixed to a base end face of the tip cover without a gap. Wherein the light emitting portion emitting end face of the light emitting element integrally fixed by adhesive to a predetermined position on the base end side of the distal end cover, eliminating the gap between the base end surface of the distal end cover and the light emitting portion The endoscope according to claim 1. Claims, characterized in that said light emitting portion emitting end face of the light emitting element is provided by integral molding at a predetermined position of the base end surface side of the end cover and without clearance disposing the light emitting portion on the base end surface of the distal end cover The endoscope according to Item 1.

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