Endoscope tip frame and endoscope

Abstract

Provided is an endoscope tip frame and an endoscope in which the joining strength and appearance quality of the boundary between the two colors of resin are excellent. The endoscope tip frame (10) of the present application includes: a primary molded product, i.e., a holding portion (20), which has a through-hole (23) and is molded from a colored resin; and a secondary molded product, i.e., a tip portion (30), which has a through-hole (33) concentric with the through-hole (23) and is molded from a transparent resin so as to overlap the holding portion (20), the diameter of the through-hole (23) being larger than the diameter of the through-hole (33).

Description

TECHNICAL FIELD

[0001] The present application relates to an endoscope front end frame and an endoscope. BACKGROUND

[0002] In recent years, two-color molded products are used in electrical products for the purpose of reducing assembly costs and improving aesthetic appearance. However, there is a temperature difference between a primary molded body and a secondary molded body molded by injecting a secondary molding material to the primary molded body, and thus the fusion bonding of the surface of the primary molded body caused by the injection of the secondary molding material is sometimes insufficient.

[0003] In view of such a problem, a method is proposed in Patent Literature 1 in which the fusion bonding strength between the primary molded body and the secondary molded body is improved by setting the melting resin temperature of the primary molding material higher to extremely thin the surface layer of the surface of the primary molded body.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] Patent Literature 1: Japanese Patent Application Publication No. 2005-1391902 SUMMARY

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] However, in the method of Patent Literature 1, the molding resin material is limited to a crystalline resin material, and thus the method cannot be applied to an amorphous resin. In addition, the demolding stress at the time of molding and the stress applied at the time of use of the product are applied to the end portion of the two-color resin boundary portion at a high level, and thus from the viewpoint of the stability and reliability of the bonding strength of the end portion of the two-color resin boundary portion, the above method is also insufficient. In particular, in an endoscope front end frame having a through-hole of a concentric circle on the primary molded body and the secondary molded body, a large shear stress is applied to the end portion of the two-color resin boundary portion inside the through-hole as a parting line, and thus a high bonding strength is required.

[0009] The present application has been achieved in view of the above-described circumstances, and aims to provide an endoscope front end frame and an endoscope in which the bonding strength of the two-color resin boundary portion and the appearance quality are excellent.

[0010] MEANS FOR SOLVING THE PROBLEMS

[0011] To solve the above-described problems and achieve the object, the endoscope front end frame of the present application includes a holding portion which is a primary molded product molded of a colored resin and has a first through-hole, and a front end portion which is a secondary molded product molded of a transparent resin so as to overlap the holding portion and has a second through-hole concentric with the first through-hole, the diameter of the first through-hole being larger than the diameter of the second through-hole.

[0012] Further, the endoscope distal end frame of the present application, on the basis of the above-mentioned application, the distal end portion has a covering portion covering at least a part of the outer periphery of the one-time molding product.

[0013] Further, the endoscope distal end frame of the present application, on the basis of the above-mentioned application, the first through-hole and the second through-hole are passage tube assembly holes.

[0014] Further, the endoscope distal end frame of the present application, on the basis of the above-mentioned application, the step portion between the first through-hole and the second through-hole is a passage tube abutting surface.

[0015] Further, the endoscope of the present application is provided with the above-mentioned endoscope distal end frame.

[0016] Effects of the Invention

[0017] According to the present application, even when a large shear stress or tensile stress is applied to the bicolored resin boundary portion inside the through-hole of the endoscope distal end frame, interface peeling of the resin boundary portion can be prevented. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a diagram schematically showing the overall structure of an endoscope system of an embodiment of the present application.

[0019] Figure 2 (a) of is a front view of an endoscope distal end frame used in the endoscope system of Figure 1 , (b) is a cross-sectional view at AA' line of (a), and (c) is a rear view.

[0020] Figure 3 is a cross-sectional view showing the state when a passage tube is assembled to Figure 2 the endoscope distal end frame of

[0021] Figure 4 is a cross-sectional view showing the structure of a bicolored molding mold of the endoscope distal end frame of Figure 2 , and is a diagram showing a mold clamped state before a one-time molding resin is filled into a one-time molding cavity.

[0022] Figure 5 is a cross-sectional view showing the state when a one-time molding resin is filled into the one-time molding cavity of the bicolored molding mold of Figure 4

[0023] Figure 6 is a cross-sectional view showing the state when the mold is opened of the bicolored molding mold of Figure 5

[0024] Figure 7 is a cross-sectional view showing the state when the mold is opened of the bicolored molding mold of Figure 6 ​​Fig. 6 is a sectional view showing a state in which the movable mold of the two-color molding mold moves to the secondary molding mold side and is clamped.

[0025] Figure 8 Fig. 7 is a sectional view showing a state in which the secondary molding cavity of the two-color molding mold is filled with the secondary molding resin. Figure 7 Fig. 8 is a sectional view showing a state in which the secondary molding cavity of the two-color molding mold is filled with the secondary molding resin.

[0026] Figure 9 Fig. 9 is a sectional view showing a state in which the two-color molding mold is opened and the two-color molded product is released from the mold. Figure 8 Fig. 10 is a sectional view showing a state in which the two-color molding mold is opened and the two-color molded product is released from the mold.

[0027] Figure 10 Fig. 11 is a sectional view showing the primary molding cavity formed in the two-color molding mold, and is an enlarged view of A of Fig. 10. Figure 4 Fig. 12 is a sectional view showing the primary molding cavity formed in the two-color molding mold, and is an enlarged view of A of Fig. 10.

[0028] Figure 11 Fig. 13 is a sectional view showing the secondary molding cavity formed in the two-color molding mold, and is an enlarged view of D of Fig. 10. Figure 7 Fig. 14 is a sectional view showing the secondary molding cavity formed in the two-color molding mold, and is an enlarged view of D of Fig. 10.

[0029] Figure 12 Fig. 15 is a sectional view showing a state in which the secondary molding cavity of the two-color molding mold is filled with the secondary molding resin, and is an enlarged view of C of (a) of Fig. 14.

[0030] Figure 13 Fig. 16 is an enlarged sectional view showing a state in which the secondary molding cavity of the conventional two-color molding mold is filled with the secondary molding resin.

[0031] Figure 14 Fig. 17 is an enlarged sectional view showing a state in which the secondary molding cavity of the conventional two-color molding mold is filled with the secondary molding resin. DETAILED DESCRIPTION

[0032] Hereinafter, embodiments of an endoscope distal end frame and an endoscope system including the same according to the present application will be described with reference to the accompanying drawings. Note that the present application is not limited to the following embodiments, and the constituent elements in the following embodiments include elements that can be easily substituted by those skilled in the art, or substantially the same elements.

[0033] [EMBODIMENT]

[0034] Figure 1 Fig. 1 is a diagram schematically showing the overall structure of an endoscope system 1 according to an embodiment of the present application. As shown in Fig. 1, the endoscope system 1 according to the present embodiment includes an endoscope 2, a light source device 3, and a processor 4. Figure 1As shown, the endoscope system 1 of the present embodiment includes an endoscope 2 that is introduced into a subject to generate an image signal of the inside of the subject by capturing the inside of the subject, an information processing apparatus 3 that performs prescribed image processing on the image signal captured by the endoscope 2 and controls each part of the endoscope system 1, a light source apparatus 4 that generates illumination light for the endoscope 2, and a display apparatus 5 that performs image display on the image signal processed by the information processing apparatus 3.

[0035] The endoscope 2 includes an insertion section 6 that is inserted into the subject, an operation section 7 that is held by an operator on the proximal end section side of the insertion section 6, and a flexible general-purpose cable 8 that extends from the operation section 7.

[0036] The insertion section 6 is implemented using a light guide composed of an illumination optical fiber, an electric cable, or an optical fiber. The insertion section 6 has a distal end section 6a in which an imaging device is built in, a bending section 6b that has a bending tube described later and is bendable, and a flexible tube section 6c that is provided on the proximal end section side of the bending section 6b and has flexibility. An illumination section that illuminates the inside of the subject via an illumination lens, an observation section that captures the inside of the subject, and an opening section that communicates with a channel for a treatment instrument are provided on the distal end section 6a. An endoscope distal end frame described later is arranged on the distal end section 6a.

[0037] The operation section 7 has a bending knob 7a that bends the bending section 6b in the up-down direction and the left-right direction, a treatment instrument insertion section 7b that inserts a treatment instrument such as a biopsy forceps or a laser scalpel into the body cavity of the subject, and a plurality of switch sections 7c that operate the information processing apparatus 3, the light source apparatus 4, a gas supply apparatus, a water supply apparatus, a gas supply apparatus, and peripheral equipment such as a bending tube. The treatment instrument inserted from the treatment instrument insertion section 7b is exposed from the opening section at the distal end of the insertion section 6 via a channel for a treatment instrument provided inside.

[0038] The general-purpose cable 8 is composed of a light guide composed of an illumination optical fiber, an electric cable, or the like. The general-purpose cable 8 branches at the proximal end, and one end of the branch is a connector 8a, and the other end of the branch is a connector 8b. The connector 8a is detachable with respect to the connector of the information processing apparatus 3. The connector 8b is detachable with respect to the light source apparatus 4. The general-purpose cable 8 propagates the illumination light emitted from the light source apparatus 4 to the distal end section 6a via the connector 8b and a light guide composed of an illumination optical fiber. In addition, the general-purpose cable 8 transmits the image signal captured by the imaging device described later to the information processing apparatus 3 via a cable and the connector 8a.

[0039] The information processing apparatus 3 performs prescribed image processing on the image signal output from the connector 8a and controls the entire endoscope system 1.

[0040] The light source device 4 is composed of a light source that emits light, a focusing lens, etc. Under the control of the information processing device 3, the light source device 4 emits light from the light source and supplies it to the endoscope 2, which is connected via a light guide composed of an illumination optical fiber through the connector 8b and the universal cable 8, as illumination light for the subject being examined.

[0041] The display device 5 is constructed using a liquid crystal or organic EL (Electroluminescence) display, etc. The display device 5 displays various information, including images processed according to prescribed image processing by the information processing device 3, via the image cable 5a. Thus, by observing the images (in vivo images) displayed on the display device 5 while operating the endoscope 2, the surgeon can observe the desired location within the examined body and determine symptoms.

[0042] Next, the construction of the endoscope front end frame 10 disposed at the front end 6a of the endoscope 2 will be described with reference to the accompanying drawings. Figure 2 (a) is in Figure 1 (a) is a front view of the endoscope front frame 10 used in the endoscope system 1, (b) is a cross-sectional view at line AA' of (a), and (c) is a rear view.

[0043] The endoscope front frame 10 has: a retaining part 20, which is a one-piece molded article made of colored resin; and a front end part 30, which is a two-piece molded article made of transparent resin in a manner that overlaps with the retaining part 20.

[0044] like Figure 2 As shown in (c), the holding part 20 has through holes 21, 22, and 23. Through hole 21 holds the observation part, through hole 22 holds the illumination part, and through hole 23 holds the channel tube for the handling device channel. The holding part 20 is formed of colored resin to prevent stray light from the illumination light emanating from the illumination part. In this specification, through hole 23 functions as the first through hole.

[0045] like Figure 2 As shown in (a), the front end portion 30 has through holes 31 and 33. No through hole is formed in the front end portion 30 at a position corresponding to the through hole 22 of the illumination section. The front end portion 30 is formed of a transparent resin that allows light irradiated from the illumination section to pass through. Light irradiated from the illumination section onto the subject and reflected is incident on the observation section through the through hole 31. In this specification, the through hole 33 functions as a second through hole. The through holes 23 and 33 are treatment instrument channels through which treatment instruments are inserted.

[0046] In the endoscope front frame 10, through holes 23 and 33 are concentric circles, but the diameter D1 of through hole 23 is larger than the diameter D2 of through hole 33. By making the diameter D1 of through hole 23 larger than the diameter D2 of through hole 33, peeling of the resin boundary between through hole 23 and through hole 33 can be effectively prevented. On the other hand, considering the reliability of reflected light incident on the observation section, through holes 21 and 31 are formed with the same diameter and are concentric circles, but the diameter of through hole 21 can also be larger than the diameter of through hole 31, thereby improving the bonding strength of the resin boundary between through hole 21 and through hole 31.

[0047] The front end portion 30 has a cover portion 34 that covers the outer periphery of the retaining portion 20. The cover portion 34 covers the outer periphery of the front end side of the retaining portion 20 over its entire circumference, but may also cover a portion of the outer periphery of the front end side. The outer peripheral surface of the cover portion 34 is the same as the outer peripheral surface of the retaining portion 20 except for the front end side. By providing the cover portion 34, the position of the resin boundary portion on the outer peripheral side of the endoscope front frame 10 is different from the parting line, and the shear stress applied to the resin boundary portion on the outer peripheral side during demolding is reduced, which can prevent the resin boundary portion from peeling off. In addition, since the joint area between the retaining portion 20 and the front end portion 30 is increased, the joint strength is also improved. Furthermore, the outer diameter D3 of the retaining portion 20 is formed to be smaller than the outer diameter D4 of the front end portion 30. By making the outer diameter D3 of the retaining portion 20 smaller than the outer diameter D4 of the front end portion 30, the irregularities in the shape can be reduced when mounting external components on the outer periphery of the retaining portion 20 and the cover portion 34.

[0048] Figure 3 It is to assemble the channel tube 40 into Figure 2 A cross-sectional view of the endoscope front frame 10. In the through-holes 23 and 33 that form the treatment instrument channel, the diameter D1 of the through-hole 23 is larger than the diameter D2 of the through-hole 33. A step portion 35 is formed between the through-holes 23 and 33. This step portion 35 functions as an abutment surface for the channel tube 40 through which the treatment instrument is inserted. For easy insertion of the treatment instrument, it is preferable that the wall thickness ((D1-D2) / 2) of the step portion 35 is approximately equal to the wall thickness of the channel tube.

[0049] Next, the two-color molding die 100 for manufacturing the endoscope front frame 10 will be described with reference to the accompanying drawings. Figure 4 It means to Figure 2 This is a cross-sectional view of the structure of the two-color molding die 100 used to mold the endoscope front frame 10. Additionally, this figure shows the state of the two-color molding die 100 when it is closed.

[0050] The two-color molding die 100 is installed in a two-color molding machine not shown in the drawing in a position matching a primary injection nozzle and a secondary injection nozzle of the two-color molding machine. The two-color molding die 100 has a primary molding die 200 and a secondary molding die 300. The primary molding die 200 has a stationary primary die 201 and a movable die 202 arranged opposite the stationary primary die 201 across a parting line (hereinafter referred to as "P.L."). The secondary molding die 300 has a stationary secondary die 301 and a movable dummy die 302 arranged opposite the stationary secondary die 301 across a P.L.

[0051] The movable die 202 and the movable dummy die 302 are supported by the movable platen 101 and configured to be movable in an opening and closing direction relative to the stationary primary die 201 and the stationary secondary die 301 by the movable platen 101. Also, the movable die 202 and the movable dummy die 302 are configured so that the movable platen 101 is rotatable about the rotation shaft 102, whereby the positions of the movable die 202 and the movable dummy die 302 can be changed. That is, the movable platen 101 is rotated 180° about the rotation shaft 102, whereby the movable die 202 is moved from a position opposite the stationary primary die 201 to a position opposite the stationary secondary die 301, and the movable dummy die 302 is moved from a position opposite the stationary secondary die 301 to a position opposite the stationary primary die 201.

[0052] The stationary primary die 201 mainly has a mounting plate 211, a drop plate 212, a stationary primary-side die plate 213, and a plurality of guide pins 214. In the stationary primary die 201, a primary sprue 215, a runner 216, a secondary sprue 217, and a gate 218 are formed.

[0053] The movable die 202 mainly has a movable-side die plate 221, a receiving plate 222, a spacer block 223, a mounting plate 224, a plurality of fastening bolts 225, a protruding plate 226, an ejection pin 227, and a core pin 228. Also, on a surface of the movable-side die plate 221 opposite the stationary primary-side die plate 213, a primary slide block 230 is provided across a movable insert 229, and a recess 230a is formed on a side of the primary slide block 230 opposite the stationary primary-side die plate 213. The recess 230a forms a primary molding cavity 220.

[0054] The core pin 228 is arranged in the recess 230a of the primary slide block 230 and forms a cylindrical primary molding cavity 220. Also, the core pin 228 is assembled to the receiving plate 222 in a manner maintaining a relative position relative to the movable-side die plate 221 through a molding process (a primary molding process and a secondary molding process) of a two-color molded product.

[0055] The fixed secondary mold 301 mainly includes a mounting plate 311, a drop plate 312, a fixed secondary side mold plate 313, and multiple guide pins 314. A primary sprue 315, a runner 316, a secondary sprue 317, and a gate 318 are formed in the fixed secondary mold 301. Furthermore, a secondary fixing insert 319 is provided on the surface of the fixed secondary side mold plate 313 opposite to the movable dummy mold 302, and a recess 319a is formed on the side of the secondary fixing insert 319 opposite to the movable dummy mold 302. Additionally, a boss 319b is disposed in the recess 319a of the secondary fixing insert 319, and the recess 319a forms a cylindrical secondary molding cavity 320 (see reference). Figure 11 ).

[0056] The movable dummy mold 302 mainly includes a movable dummy side mold plate 321, a bearing plate 322, a spacer block 323, a mounting plate 324, and multiple fastening bolts 325.

[0057] The following is for reference Figures 5 to 9 A method for manufacturing an endoscope front end frame using a two-color molding die 100 will be described. In the method for manufacturing the endoscope front end frame as a two-color molded product, a primary molding process and a secondary molding process are performed.

[0058] (One-step molding process)

[0059] First, such as Figure 5 As shown, with the two-color molding mold 100 closed, colored primary molding resin r1 is filled into the primary molding cavity 220, formed by the fixed primary side mold plate 213, ejector pin 227, core pin 228, movable insert 229, and primary sliding insert 230, through the primary sprue 215, runner 216, secondary sprue 217, and gate 218 of the primary mold 201. This primary molding resin r1 can be, for example, a colored resin that has been opaquely colored to PC (polycarbonate). Further details regarding the primary molding cavity 220 will be described later (see [reference]). Figure 10 ).

[0060] Next, as Figure 6 As shown, the two-color molding mold 100 is opened. As a result, the primary molding resin r1 filled in the primary molding cavity 220 is separated into a holding portion 20, which is held in the core pin 228 of the movable mold 202, and a primary molding runner portion 231, which is held in the fixed primary mold 201. Furthermore, the holding portion 20, which is demolded from the fixed primary mold 201, is formed into a cylindrical shape with a through hole.

[0061] Next, as Figure 7As shown, the mold is closed by rotating the movable platen 101 by 180° about the rotation axis 102, thereby exchanging the positions of the movable mold 202 holding the holding portion 20 by the core pin 228 and the movable dummy mold 302. Then, the mold is closed. Further, in this example, the primary slide insert 230 attached to the movable side mold plate 221 is replaced by the secondary slide insert 330 for simplification of the drawing. Thus, the secondary molding cavity 320 is formed between the recess 319a of the secondary fixed insert 319 and the holding portion 20 and the secondary slide insert 330. Details of the secondary molding cavity 320 will be described later (see FIG. 9). Figure 11 ).

[0062] (Secondary molding step)

[0063] Next, as shown in FIG. 6, the mold is closed. Then, the primary molding resin r1 is filled into the primary molding cavity 220. As the primary molding resin r1, a transparent resin such as PC (polycarbonate) can be used. Figure 8

[0064] Next, as shown in FIG. 7, the mold is opened. Thus, the primary molding resin r1 filled into the primary molding cavity 220 is separated into the holding portion 20 held by the core pin 228 of the movable mold 202 and the front end portion 30 held by the secondary mold 301. The front end portion 30 is formed of the holding portion 20 as the primary molding product and the front end portion 30 as the secondary molding product. Figure 9

[0065] Further, the protruding plate 226 is moved in the P.L. direction, and the endoscope front end frame 10 held by the core pin 228 of the movable mold 202 is pressed by the ejection pin 227 of the protruding plate 226, thereby being demolded from the movable mold 202. Further, the front end portion 30 demolded from the movable mold 202 is formed of transparent material and has a through hole.

[0066] Hereinafter, the primary molding cavity 220 and the secondary molding cavity 320 formed in the two-color molding mold 100 and the endoscope front end frame 10 manufactured by the above manufacturing method will be described with reference to the drawings. Figures 10 to 14

[0067] (Primary molding cavity)

[0068] Figure 10 is Figure 4 ​​​The enlarged view of part A shows the cross-sectional shape of the primary molding cavity 220 during mold closing in a primary molding process. The primary molding cavity 220 is formed by the recess 230a of the primary sliding insert 230, the fixed primary side mold plate 213, the ejector pin 227, and the core pin 228. The front end face of the core pin 228 abuts against the fixed primary side mold plate 213, and the PL side end face of the primary molding cavity 220 is on the same plane as the front end face of the core pin 228. Therefore, the shape of the retaining part 20 with a through hole in the mold opening and closing direction is defined.

[0069] The recess 230a is formed into a cylindrical shape with a predetermined diameter and communicates with the gate 218, which serves as the inlet for the one-time molding resin r1. In addition, a stepped portion with a covering portion 34 is formed on the outer periphery of the recess 230a.

[0070] (Secondary molding cavity)

[0071] Figure 11 yes Figure 7 The enlarged view of part D shows the cross-sectional shape of the secondary molding cavity 320 during mold closing in the secondary molding process. The secondary molding cavity 320 is formed by the primary molding demolding surface of the holding part 20, the secondary sliding insert 330, the core pin 228, and the recess 319a of the secondary fixing insert 319.

[0072] The retaining part 20 has a through hole 23, through which a core pin 228 is inserted. The front end face of the boss portion 319b disposed in the recess 319a of the secondary fixing insert 319 abuts against the front end face of the core pin 228. The through hole 33 of the front end portion 30 is formed by the boss portion 319b. In this embodiment, the diameter of the boss portion 319b is smaller than the diameter of the core pin 228.

[0073] Figure 12 This diagram shows the secondary molding cavity 320 of the two-color molding mold 100 filled with secondary molding resin r2. Secondary molding resin r2 is supplied from the gate 318 between the secondary sliding insert 330 and the retaining part 20. Figure 12In the case of (a) and (b) shown in FIG. 9, the secondary molding resin r2 flows on the holding portion 20 in the recess 319a, passes over the end portion 25 of the bicolored resin boundary portion in the through-hole, and is filled to the outer edge of the abutting portion of the boss portion 319b and the core pin 228. In the present embodiment, since the melted secondary molding resin r2 passes over the end portion 25 of the bicolored resin boundary portion, the melted secondary molding resin r2 also flows over the end portion 25 of the bicolored resin boundary portion. Thereby, the surface of the holding portion 20 in the vicinity of the end portion 25 of the bicolored resin boundary portion is remelted and sufficiently fusion-bonded to the front end portion 30 as a secondary molded product, and thus peeling of the primary molding resin r1 and the secondary molding resin r2 of the bicolored resin boundary portion caused by the force (boss portion demolding resistance) in which the outer peripheral surface of the boss portion 319b pulls the inner surface of the through-hole of the front end portion 30 in the opening direction at the time of opening the mold can be suppressed, and the endoscope front end frame 10 as a molded product can be obtained with high appearance quality without molding defects.

[0074] On the other hand, Figure 13 and Figure 14 is an enlarged sectional view at the time when the secondary molding resin is filled in the secondary molding cavity 320 of the conventional bicolored molding mold. Figure 13 is a case where the diameter of the through-hole of the holding portion 20 is the same as that of the front end portion 30, Figure 14 indicates a case where the diameter of the through-hole of the holding portion 20 is smaller than that of the front end portion 30. In Figure 13 and Figure 14 the case, the end portion 25 of the bicolored resin boundary portion becomes the filling end portion of the secondary molding resin r2, and thus it is difficult to cause the surface of the holding portion 20 to be remelted at the end portion 25 of the bicolored resin boundary portion, and the holding portion 20 is not sufficiently fusion-bonded to the front end portion 30. In such a case, peeling of the primary molding resin r1 and the secondary molding resin r2 of the bicolored resin boundary portion is easily caused by the boss portion demolding resistance, and an endoscope front end frame with high appearance quality cannot be obtained.

[0075] As described above, the endoscope front end frame 10 of the present embodiment makes the diameter of the through-hole 23 of the holding portion 20 as a primary molded product constituting the treatment instrument channel larger than the diameter of the through-hole 33 of the front end portion 30 as a secondary molded product. Thereby, the secondary molding resin r2 constituting the front end portion 30 passes over the surface of the holding portion 20 in a melted state, the holding portion 20 is remelted at the end portion 25 of the bicolored resin boundary portion inside the through-hole and is sufficiently fusion-bonded to the front end portion 30, and thus peeling at the resin interface can be suppressed, and an endoscope front end frame 10 with excellent overmolding quality can be obtained.

[0076] The endoscope front end frame and the endoscope having the same according to the present application have been described above by way of a mode for carrying out the present application, but the gist of the present application is not limited to these descriptions, and must be broadly interpreted based on the descriptions of the claims. In addition, solutions in which various modifications, changes, and the like are made based on these descriptions are of course included in the gist of the present application.

[0077] Label Explanation

[0078] 1 Endoscope system

[0079] 2 Endoscope

[0080] 3 Information processing apparatus

[0081] 4 Light source apparatus

[0082] 5 Display apparatus

[0083] 6 Insertion section

[0084] 6a Front end section

[0085] 6b Bend section

[0086] 6c Flexible tube section

[0087] 7 Operation section

[0088] 7a Bend knob

[0089] 7b Treatment instrument insertion section

[0090] 7c Switch section

[0091] 8 Universal cable

[0092] 8a, 8b Connector

[0093] 10 Endoscope front end frame

[0094] 20 Holding section

[0095] 21, 22, 23, 31, 33 Through hole

[0096] 30 Front end section

[0097] 34 Cover section

[0098] 40 Channel tube

[0099] 100 Two-color molding mold

[0100] 101 Movable platen

[0101] 102 Rotation shaft

[0102] 200 Primary molding mold

[0103] 201 Fixed primary mold

[0104] 202 movable mold

[0105] 211 mounting plate

[0106] 212 drop plate

[0107] 213 fixed primary mold plate

[0108] 214 guide pin

[0109] 215, 315 primary sprue

[0110] 216, 316 runner

[0111] 217, 317 secondary sprue

[0112] 218, 318 gate

[0113] 221 movable mold plate

[0114] 222 receiving plate

[0115] 223 spacer block

[0116] 224 mounting plate

[0117] 225 fastening bolt

[0118] 226 protruding plate

[0119] 227 ejector pin

[0120] 228 core pin

[0121] 229 movable insert

[0122] 230 primary slide insert

[0123] 230a, 319a recess

[0124] 300 secondary molding mold

[0125] 301 fixed secondary mold

[0126] 302 movable dummy mold

[0127] 311 mounting plate

[0128] 312 drop plate

[0129] 313 fixed secondary mold plate

[0130] 314 guide pin

[0131] 319 secondary fixed insert

[0132] 319b boss portion

[0133] 321 movable dummy side mold plate

[0134] 322 receiving plate

[0135] 323 spacer block

[0136] 324 mounting plate

[0137] 325 fastening bolt

[0138] 330 secondary slide insert

[0139] r1 primary molding resin

[0140] r2 secondary molding resin

Claims

1. An endoscope distal end frame comprising: a holding portion that is a one-piece molded product molded from a colored resin, and has a first through-hole; and a distal end portion that is a two-piece molded product molded from a transparent resin so as to overlap the holding portion, and has a second through-hole concentric with the first through-hole, wherein the diameter of the first through-hole is larger than the diameter of the second through-hole, and a resin boundary portion is present between the first through-hole and the second through-hole. The distal end portion has a covering portion that covers at least a portion of the outer periphery of the holding portion. The outer peripheral surface of the covering portion and the outer peripheral surface of the holding portion other than the at least a portion are the same surface. The first through-hole and the second through-hole are passage tube assembly holes.

2. The endoscope distal end frame of claim 1, wherein, A step portion between the first through-hole and the second through-hole is a passage tube abutment surface.

3. The endoscope distal end frame of claim 2, wherein, 6. An endoscope comprising the endoscope distal end frame according to any one of claims 1 to 5.

4. The endoscope distal end frame of claim 1, wherein, ​ 5. The endoscope distal end frame of claim 4, wherein, ​ ​

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