JP5465154B2 - Endoscope tip unit - Google Patents

Description

  The present invention relates to a distal end unit of an endoscope disposed at a distal end portion of an insertion portion.

  In general, as shown in FIG. 6A, the distal end portion 221 of the insertion portion of the endoscope is provided with an air / water supply channel 245 and a first conduit portion 275a for arranging an optical unit (not shown). It is installed. An optical member 291 (for example, an illumination lens) is bonded to the distal end portion of the first duct portion 275a with an adhesive or the like. However, the bonding operation is difficult, the adhesive is hardened for a long time, and the optical member 291 itself is expensive.

  Therefore, as shown in FIG. 6B, the endoscope distal end unit 270 having the optical member 291 is formed by the following general two-color molding.

  In the primary molding, a transparent resin is poured into a first mold (not shown) and hardened, whereby the optical member 291 is formed. When the resin is poured into the mold, a gate (not shown) that is an emission portion that emits the resin is used. Generally, the gate cannot be installed at an optically effective place (for example, the lens portion 293) of the optical member 291. Therefore, a gate is installed around the lens portion 293, and the optical member 291 is formed from the outside. As a result, the optical member 291 has a lens portion 293 disposed at the center of the optical member 291 and a thin portion 295 disposed around the lens portion 293. The waste part 295 becomes a peripheral wall part of the lens part 293. The first mold that forms the lens surface (lower surface) in the lens portion 293 during the primary molding is not separated from the optical member 291 after the primary molding, and the secondary molding is performed together with the optical member 291 during the secondary molding. Is disposed in a second mold (not shown). That is, the first mold used in the primary molding functions as a support member that supports the optical member 291 itself until the secondary molding is completed. The inner periphery of the meat portion 295 externally fits (closely contacts) the outer peripheral surface near the tip of the second mold, thereby preventing the second mold and the optical member 291 from shifting during the secondary molding process. Is done.

  In the secondary molding, the optical member 291 is placed in the second mold for secondary molding, and an opaque resin is poured into the second mold so as to cover the optical member 291. As a result, the support member 201 (C phone tie) covers the optical member 291 and is formed to support the optical member 291. At the same time, the optical member 291 and the support member 201 are integrated to form the tip unit 270.

  In the secondary molding, the support member 201 (C phone tie) is provided with an optical member 291. The first duct portion 275a for the lens portion 293 in the optical member 291 and other built-in items other than the illumination unit. A second conduit portion 275b for the functional member (for example, the air / water supply channel 245) is also formed.

  For example, Patent Document 1 discloses an inexpensive optical component that can accurately form an optical element and has good optical performance.

  Further, for example, Patent Document 2 discloses an optical component that has good optical performance and can be configured at low cost on the top.

JP-A-9-108174 Japanese Patent Application Laid-Open No. 9-105881

  In the secondary molding, as shown in FIG. 6C, if the support member 201 (opaque resin) does not cover the above-described optical member 291 firmly, the surplus portion 295 is exposed, and the second portion on the surplus portion 295 side, for example, There is a possibility that irregularities 201a and burrs may occur in the pipe portion 275b (air / water channel 245). However, as shown in FIG. 6B, when the opaque resin firmly covers the optical member 291 including the surplus portion 295 as described above, the first pipe line portion 275a and the second second portion are equal to the thickness L1 of the surplus portion. The distance L2 with the pipe line part 275b is extended, and the tip unit 270 is thickened.

  When the tip unit 270 is formed by two-color molding in this way, the tip unit 270 becomes thick.

  Therefore, in view of the above problems, an object of the present invention is to provide a distal end unit of a small-diameter endoscope even if formed by two-color molding.

For the present invention to achieve the object, in the primary molding step of the two-color molding, an optical member formed by the first resin, in the secondary molding step of the two-color molding is molded by the second resin An endoscope tip unit comprising: a support member that integrally supports the optical member; a lens unit provided in the optical member; a lens unit provided in the optical member; A holding portion that is integrally connected to the side and has an opening that penetrates in a direction substantially parallel to the optical axis of the lens portion, and is provided on the support member, and communicates with a front end surface of the lens portion. An endoscope distal end unit is provided, comprising: a first duct section; and a second duct section provided on the support member and communicating with the opening .

  ADVANTAGE OF THE INVENTION According to this invention, even if it forms by 2 color molding, the front-end | tip unit of a thin endoscope can be provided.

FIG. 1 is a schematic view of an endoscope according to the present invention. FIG. 2A is a perspective view of the tip unit. FIG. 2B is a perspective view of the tip unit in which the nozzle is disposed. FIG. 3 is a perspective view of the optical member. FIG. 4A is a diagram showing an arrangement of optical members inside the tip unit. FIG. 4B is a diagram showing a state in which nozzles are arranged in the state shown in FIG. 4A. FIG. 5A is a diagram illustrating a first modification of the optical member. FIG. 5B is a diagram illustrating an optical member having a D-cut shape. FIG. 6A is a diagram illustrating a state in which an optical member is bonded to the distal end portion of the insertion portion. FIG. 6B is a diagram showing a tip unit formed by general two-color molding. FIG. 6C is a diagram illustrating a tip unit that is formed by general two-color molding and generates irregularities and burrs in the air / water feeding nozzle.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The first embodiment will be described with reference to FIGS. 1, 2A, 2B, 3, 4, 4A, and 4B.
As shown in FIG. 1, the endoscope 1 includes an elongated insertion portion 10 that is inserted into a body cavity of a patient, and an operation portion 60 that is connected to the proximal end portion of the insertion portion 10 and operates the endoscope 1. Have.

  The insertion portion 10 includes a distal end hard portion 21, a bending portion 23, and a flexible tube portion 25 from the distal end side to the proximal end portion side of the insertion portion 10. The proximal end portion of the distal rigid portion 21 is connected to the distal end portion of the bending portion 23, and the proximal end portion of the bending portion 23 is connected to the distal end portion of the flexible tube portion 25.

The flexible tube portion 25 has a desired flexibility and is bent by an external force. The flexible tube portion 25 is a tubular member that extends from the operation portion 60.
The bending portion 23 is bent in a desired direction such as up, down, left, and right by the operation of the operation unit 60. When the bending portion 23 is bent, the position and orientation of the distal end hard portion 21 change, the observation target is captured in the observation field (or the observation window 41a), and the illumination light is illuminated on the observation target.

Next, the distal end hard portion 21 of the present embodiment will be described in detail with reference to FIGS. 2A and 2B.
The distal end hard portion 21 is a distal end portion of the insertion portion 10 and is hard.
The hard distal end portion 21 is formed as the distal end unit 70 of the endoscope 1.

  As shown in FIG. 2A, the distal end unit 70 is provided with a plurality of duct portions 75a, 75b, 75c, and 75d. An illumination unit (not shown) including, for example, a lens portion 93 and a light guide is disposed in the first conduit portion 75a. The 2nd pipe line part 75b functions as the air / water supply channel 45, for example. The third conduit portion 75c functions as, for example, a treatment instrument insertion channel. For example, an imaging unit (not shown) including an observation window 41a is disposed in the fourth conduit portion 75d.

  A lens portion 93 is disposed in the opening 77a of the first conduit portion 75a. As shown in FIG. 2B, the fluid is passed from the second conduit 75b to the opening 77d (observation window 41a) of the fourth conduit 75d in the opening 77b of the second conduit 75b. A nozzle 79 for flowing is fitted. The nozzle 79 faces the opening 77d, and discharges fluid toward the opening 77d. The opening 77c of the third conduit portion 75c functions as a distal end opening of the treatment instrument insertion channel. An observation window 41a of the imaging unit is disposed in the opening 77d of the fourth conduit portion 75d.

  The lens portion 93 (opening portion 77a), the opening portion 77b, the tip opening portion (opening portion 77c), and the opening portion 77d are separated from each other by a desired distance.

Such a tip unit 70 is formed by two-color molding.
In the primary molding, a transparent resin A (first resin) is filled in a first mold (not shown) and formed as a lens-type optical member 91 as shown in FIG. That is, the optical member 91 is formed by the resin A and the first mold (not shown) in the primary molding. Resin A is, for example, polysulfone.

As shown in FIGS. 3 and 4A, the optical member 91 includes, for example, a lens portion 93 having a function of an illumination lens, and a holding portion 95 that integrally holds the lens portion 93 so as to be integrated with the lens portion 93. have.
The lens portion 93 is formed of the resin A as described above in the primary molding. The lens portion 93 is disposed in the first conduit portion 75a in the secondary molding.
Note that the above-described first mold that also forms the lens surface (lower surface) of the lens portion 93 during the primary molding is not separated from the optical member 91 after the primary molding, and is secondary with the optical member 91 during the secondary molding. It arrange | positions at the 2nd metal mold | die (not shown) for shaping | molding. That is, the first mold functions as a support member that supports the optical member 91 itself until the secondary molding is completed. At this time, the inner peripheral surface 95h of the holding portion 95 on the opening 95e side and the opening 95g side is externally fitted (closely attached) to the outer peripheral surface in the vicinity of the tip of the first mold. The second mold and the optical member 91 are prevented from shifting.

  The holding part 95 is a frame member of the lens part 93, a peripheral wall part of the lens part 93, and a thin part.

  As shown in FIG. 4A, the holding portion 95 has the base end portion 93 c of the lens portion 93 and the tip portion of the holding portion 95 so that the tip end surface 93 a of the lens portion 93 protrudes from the tip end surface 95 a of the holding portion 95. 95b. Therefore, the holding portion 95 is formed with an opening 95e (concave portion) such as a groove. The opening 95e is formed closer to the base end portion 95c of the holding portion 95 than the lens portion 93, and is surrounded by the holding portion 95, and communicates with the first pipe line portion 75a (opening 77a) in the secondary molding. To do. In other words, since the lens portion 93 has the function of an illumination lens in the present embodiment, the opening 95e is formed in the holding portion 95 in the primary molding so as to communicate with the first pipe portion 75a in the secondary molding. The opening 95e is provided for the optical member 91 to be provided in the second mold for secondary molding, and for the first mold to be fitted in the secondary molding as described above. ing.

  The holding portion 95 is adjacent to the lens portion 93, specifically, the opening portion 95e, and has an opening portion 95g communicating with a conduit portion for a functional member other than the lens portion 93 in the secondary molding. In other words, the opening 95 g is a hole for a built-in object adjacent to the lens portion 93. The functional members other than the lens unit 93 and the built-in objects adjacent to the lens unit 93 indicate units other than the illumination unit corresponding to the lens unit 93, such as an imaging unit, an air / water supply channel 45, and a treatment instrument insertion channel. . In addition, the conduit portions for the functional members other than the lens portion 93 are, for example, the second conduit portion 75b (air / water supply channel 45), the third conduit portion 75c, and the fourth conduit portion 75d. In the following description, for example, the second conduit portion 75b will be described.

As described above, the opening 95g is adjacent to the opening 95e and is held in the primary molding so as to communicate with the second pipe line portion 75b (opening 77b (the tip 45b of the air / water supply channel 45)). The portion 95 is formed. Since the opening 95g communicates with the second conduit 75b (opening 77b), the opening 95g functions as a part of the second conduit 75b. As shown in FIGS. 2B and 4B, the inner peripheral surface 95 h of the holding portion 95 around the opening 95 g is covered by the nozzle 79 in the opening 95 g communicating with the second pipe portion 75 b. The nozzle 79 is fitted.
In this way, the holding portion 95 is formed closer to the base end portion 95c than the lens portion 93 in the primary molding, and the opening 95e communicated with the second pipe portion 75b in the secondary molding, and in the primary molding. An opening 95g is formed next to the lens portion 93 (opening 95e) and communicates with the second pipe portion 75b in the secondary molding.

  In the secondary molding, the holding portion 95 has the lens portion 93 disposed in the opening 77a (the tip portion of the first conduit portion 75a), and the tip surface 93a of the lens portion 93 is the same as the end surface of the tip unit 70. The lens portion 93 is held so as to be a flat surface. In the secondary molding, the holding portion 95 is disposed, for example, around the first pipe portion 75a and the second pipe portion 75b.

  As shown in FIGS. 3 and 4A, the openings 95e and 95g are, for example, cylindrical, and the holding part 95 around the openings 95e and 95g is a cylindrical peripheral wall (frame). . The size of the opening 95e is substantially the same as the size of the opening 77a, and the opening 95g has the same size as the opening 77b. As described above, the openings 95e and 95g have the same size as the openings 77a and 77b (the first conduit portion 75a and the second conduit portion 75b). Therefore, the opening 95e also serves as at least a part of the first pipe part 75a so as to function as a part of the first pipe part 75a. The opening 95g also serves as at least a part of the second pipe part 75b so as to function as a part of the second pipe part 75b.

  As shown in FIG. 4B, since the opening 95g needs to function as a part of the second duct portion 75b, the distance L10 between the opening 95e and the opening 95g (the thickness of the holding portion 95). Is the distance L20 between the first pipe section 75a and the second pipe section 75b (air / water supply channel 45) in the secondary molding described later, that is, the distance between the opening 77a and the opening 77b. It corresponds to (the thickness of the support member 101 described later). The distances L <b> 10 and L <b> 20 are such thicknesses that the resin B in the support member 101 to be described later flows from the proximal end side to the distal end side of the distal end unit 70 and the resin B can cover the optical member 91.

  In addition, when the lens part 93 has the function of the observation window 41a, the opening part 95e is connected to the 4th duct part 75d (opening part 77d).

  As described above and as shown in FIG. 3, the lens part 93 and the holding part 95 constitute the optical member 91 by being formed integrally with the resin A in the primary molding. That is, the optical member 91 is formed of the resin A so that the lens portion 93 and the holding portion 95 having the opening portion 95e and the opening portion 95g are integrated. Thus, the optical member 91 (the lens portion 93, the holding portion 95, the opening portion 95e, and the opening portion 95g) is formed by the resin A and the first mold in the primary molding as described above.

  As described above, the first mold for forming the lens surface (lower surface) of the lens portion 93 and the inner peripheral surface 95h on the side of the openings 95e, 95g during the primary molding is the openings 95e, 95g in FIG. 4A. They are formed in substantially the same shape. As described above, the first mold is not separated from the optical member 91 after the primary molding, and is disposed in the second mold for secondary molding together with the optical member 91 during the secondary molding. That is, the first mold used at the time of primary molding functions as a support member that supports the optical member 91 itself until the secondary molding is completed. During the secondary molding process, the inner peripheral surface 95h on the opening 95e side and the inner peripheral surface 95h on the opening 95g side are externally fitted (contacted) to the outer peripheral surface near the tip of the first mold. Deviation between the second mold and the optical member 91 is prevented. In this state, the optical member 91 is disposed in a second mold (not shown), and an opaque resin B (second resin) is filled in the second mold. Resin B is, for example, polysulfone.

  At this time, as shown in FIG. 4A, the resin B is composed of the first pipeline portion 75a, the second pipeline portion 75b adjacent to the first pipeline portion 75a, the third pipeline portion 75c, A support member 101 (C phone tie) that integrally supports the optical member 91. That is, in the secondary molding, the support member 101 is provided with the first pipeline portion 75a, the second pipeline portion 75b adjacent to the first pipeline portion 75a, the third pipeline portion 75c, and the fourth pipeline. The resin B and the second mold are formed so as to have the portion 75d and to support the optical member 91 integrally. In other words, in the secondary molding, the first pipe part 75a, the second pipe part 75b, the third pipe part 75c, and the fourth pipe part 75d are formed on the support member 101.

  When the support member 101 integrally supports the optical member 91, the tip unit 70 is formed. The support member 101 is a frame member of the optical member 91.

  As shown in FIGS. 4A and 4B, the end surface of the support member 101 is formed as an end surface of the tip unit 70.

  The support member 101 is arranged such that the front end surface 93a of the lens unit 93 is disposed on the same plane as the end surface of the front end unit 70, and covers the side surface 93f of the lens unit 93 and the holding unit 95 excluding the inner peripheral surface 95h. That is, the optical member 91 is supported at the tip of the support member 101 so that the optical member 91 is disposed inside the support member 101. At this time, the opening portion 95e communicates with the first conduit portion 75a, and the lens portion 93 is further disposed, and the opening portion 95g communicates with the second conduit portion 75b.

  In the support member 101, a distance L20 (thickness of the support member 101) between the first pipe part 75a and the second pipe part 75b is a distance L10 (holding) between the opening 95e and the opening 95g. The thickness of the portion 95).

  Thus, the tip unit 70 includes the optical member 91 and the support member 101, and is formed by two-color molding.

Next, a method for manufacturing the tip unit 70 of this embodiment will be described.
In the primary molding, a gate (not shown) emits the resin A to the first mold, and the resin A is filled in the first mold. At this time, the resin A flows from the portion of the holding portion 95 that is the thin portion in the first mold toward the portion of the lens portion 93 in the first mold. Thereby, the optical member 91 is formed from the holding part 95 side toward the lens part 93. The lens portion 93 and the holding portion 95 are formed so as to be integrated, and the optical member 91 is configured.

  At this time, the distal end surface 93 a of the lens portion 93 protrudes from the distal end surface 95 a of the holding portion 95, and the proximal end portion 93 c of the lens portion 93 is held by the distal end portion 95 b of the holding portion 95. Therefore, an opening 95e is formed in the holding portion 95. An opening 95g is formed next to the opening 95e.

  In the secondary molding, the optical member 91 is disposed in the second mold while being held by the first mold used in the primary molding as described above, and the resin B is filled in the second mold. Is done. Thereby, the support member 101 which covers the optical member 91 and supports the optical member 91 integrally is formed, and the tip unit 70 is configured.

  At this time, the support member 101 (tip unit 70) includes a first pipe part 75a, a second pipe part 75b adjacent to the first pipe part 75a, a third pipe part 75c, A fourth conduit portion 75d and an end surface are formed. Further, the optical member 91 is supported so that the front end surface 93a of the lens portion 93 is disposed on the same plane as the end surface of the support member 101, and the optical member 91 is covered with the support member 101 and disposed inside the support member 101. It is supported at the tip of the member 101. In addition, an opening 95e communicates with the first conduit portion 75a, and a lens portion 93 is disposed, and an opening 95g communicates with the second conduit portion 75b.

  In addition, since the opening 95g functions as a part of the second conduit portion 75b, the distance L20 (the support member 101) between the first conduit portion 75a and the second conduit portion 75b in the support member 101. Is substantially the same as the distance L10 (thickness of the holding portion 95) between the opening 95e and the opening 95g. Therefore, it is not necessary to pour the resin B around the holding portion 95 between the opening 95e and the opening 95g. That is, the distance L20 is not greater than the distance L10 and is the same as the distance L10.

  The tip unit 70 is connected to the bending portion 23, and an illumination unit is disposed in the first conduit portion 75a and the opening 95e. A nozzle 79 is fitted in the opening 77b and the opening 95g, and the inner peripheral surface 95h of the holding portion 95 around the opening 95g is covered with the nozzle 79, as shown in FIG. 4B.

  Thus, when the illumination unit emits light, the light is emitted from the lens unit 93 to the outside of the endoscope 1. The light passes through the optical member 91 formed of the transparent resin A, but the optical member 91 is covered with the support member 101, and the inner peripheral surface 95h of the holding portion 95 around the opening 95g is covered with the nozzle 79. Therefore, the light exits from the lens unit 93 without leaking from other than the lens unit 93.

  Thus, in this embodiment, the lens part 93 is arrange | positioned in the 1st pipe line part 75a. In the present embodiment, the opening 95 g is formed integrally with the lens portion 93 and adjacent to the lens portion 93. In the present embodiment, the opening 95g is communicated with the second conduit portion 75b, and the opening 95g functions as a part of the second conduit portion 75b. Therefore, in the present embodiment, in the holding portion 95 that is a thin portion, it is necessary to flow the resin B around the holding portion 95 between the opening 95e and the opening 95g at the time of secondary molding as shown in FIG. 6B. No. Therefore, in this embodiment, the distance L20 between the lens part 93 (first pipe part 75a) and the air / water supply channel 45 (second pipe part 75b) is set between the opening 95e and the opening 95g. It can be the same as the distance L10. Thereby, in this embodiment, even if the tip unit 70 is formed by two-color molding, the tip unit 70 can be reduced in diameter.

  Moreover, in this embodiment, even if the holding | maintenance part 95 which is a waste part is formed, the front-end | tip unit 70 can be made into a small diameter.

  In the present embodiment, the opening 95g is caused to function as a part of the second conduit portion 75b, so that it is unnecessary to cover the inner peripheral surface 95h of the holding portion 95 in the opening 95g with the resin B. Further, in this embodiment, the tip unit 70 can be reduced in diameter, and further, as shown in FIG. 6C, unevenness 201a and burrs are prevented from being generated in the second conduit portion 75b (air / water supply channel 45). be able to.

  In this embodiment, the opening 95g and the tip 45b (opening 77b) of the air / water supply channel 45 are set to have the same size, thereby preventing fluid from leaking.

  In the present embodiment, the inner peripheral surface 95h of the holding portion 95 around the opening 95g is covered with the nozzle 79, so that light can be emitted only from the lens portion 93 without leaking light from other than the lens portion 93. And loss of light quantity can be prevented.

  In the present embodiment, the holding portion 95 has an opening portion 95g that communicates with the second conduit portion 75b. However, the present invention is not limited to this, and the third conduit portion 75c and the fourth conduit portion 75b are not limited thereto. You may further have the opening part connected with the pipe line part 75d.

  In the present embodiment, the opening 95g and the second conduit portion 75b (opening 77b) have the same size, but the opening 95g is at least part of the second conduit portion 75b. If the shape is the same as the shape, the opening 95g does not need to have a cylindrical shape like the second pipe portion 75b (opening 77b), and the opening 95g, specifically, around the opening 95g. The holding portion (peripheral wall portion, frame portion) may be C-shaped or semicircular as shown in FIG. 5A, for example. As described above, the shape of the opening 95g is not particularly limited as long as the opening 95g can also serve as at least a part of the second duct portion 75b.

  In this embodiment, since the optical member 91 and the support member 101 can be integrated by two-color molding, the optical member 91 and the support member 101 can be integrated with high accuracy and easily in a short time rather than using an adhesive. can do.

  In the present embodiment, the distal end unit 70 is disposed at the distal end portion of the insertion portion 10 of the endoscope 1, but it is not necessary to be limited to this. The tip unit 70 may be disposed at the tip of the insertion portion that is inserted into the body cavity.

  In order to make the tip unit 70 thinner, in FIG. 6B, if the distance L1 and the distance L2 are made substantially the same, the second mold for forming the second conduit portion 275b at the time of secondary molding Interference with the optical member 91 causes the position of the optical member 291 to shift with respect to the support member 201, which may result in failure to obtain desired optical characteristics. However, in this embodiment, even if the distance L10 and the distance L20 are substantially the same, the support member 101 can support the holding portion 95 on the opening 77b side. Thereby, in this embodiment, the position shift of the optical member 91 with respect to the support member 101 can be prevented, and the distal end unit 70 of the small-diameter endoscope capable of obtaining desired optical characteristics can be easily formed by two-color molding.

6B, if the distance L1 and the distance L2 are made to be substantially the same in FIG. 6B, as shown in FIG. The portion 95k) is deleted, and the optical member 91 needs to have a D-cut shape. However, in this case, the resin B does not flow to the side surface 93f side of the lens portion 93, and there is a possibility that irregularities and burrs may occur on the side surface 93f. Thus, if the optical member 91 has a D-cut shape, there is a possibility that optical characteristics may not be obtained.
In addition, the lens portion 93 and the holding portion 95 in the first mold are different from each other. For this reason, if the holding portion 95 (cask portion) on the second conduit portion 75b side is deleted in a state where the mold is displaced, the lens portion 93 may be deformed and optical characteristics may not be obtained.
However, in the present embodiment, since the opening 95g is formed so that the distance L10 and the distance L20 are substantially the same, it is not necessary to delete the holding portion 95 that is the thick portion, and it is possible to always obtain optical characteristics. In the present embodiment, the primary molding molds for molding the openings 95e and 95g used at the time of the primary molding are the first pipe portion 75a and the second pipe at the time of the secondary molding. Since it remains as a mold for the pipe line portion 75b, there is no risk of positional displacement between the second mold for secondary molding and the optical member 91, and as a result, the positional displacement between the optical member 91 and the support member 101 occurs. Even if the mold is misaligned, it is not necessary to delete the holding portion 95 which is a thick portion, the deformation of the lens portion 93 can be prevented, and the optical characteristics can always be obtained.

  The present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Endoscope, 10 ... Insertion part, 21 ... Hard tip part, 23 ... Curved part, 25 ... Flexible pipe part, 45 ... Air / water supply channel, 70 ... Tip unit, 75a ... 1st pipe line part, 75b ... second pipe part, 77a, 77b ... opening, 91 ... optical member, 93 ... lens part, 95 ... holding part, 95e, 95g ... opening, 95h ... inner peripheral surface, 101 ... supporting member.

Claims (3)

An optical member formed of a first resin in a primary molding step of two-color molding;
A support member that integrally supports the optical member, which is molded by a second resin in the secondary molding step of the two-color molding;
An endoscope tip unit comprising :
A lens portion provided on the optical member ;
A holding portion provided in the optical member, integrally connected to a side of the lens portion, and having an opening penetrating in a direction substantially parallel to the optical axis of the lens portion ;
A first pipe line portion provided on the support member and communicating with a tip surface of the lens portion;
A second pipe line portion provided in the support member and communicating with the opening;
An endoscope tip unit comprising the endoscope.   The endoscope distal end unit according to claim 1, wherein the opening has the same shape as at least a part of the second duct portion.   The distal end unit of the endoscope according to any one of claims 1 to 2, wherein the second conduit portion includes an air / water supply channel.

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