JP4537514B2 - Endoscope - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endoscope suitable for performing autoclave sterilization.
[0002]
[Prior art]
In recent years, an elongated insertion part is inserted into a body cavity, etc., and for example, gastrointestinal tracts such as the esophagus, stomach, small intestine, large intestine, and trachea such as lungs are observed. Endoscopes that can be used for various treatments by inserting tools are widely used. In general, an endoscope is provided with a solid-state image pickup device such as a CCD (charge coupled device) for picking up a subject image and a circuit board electrically connected to the solid-state image pickup element at the distal end of an insertion portion. The connected signal cable is inserted through the insertion portion and extends from the endoscope, and a connector is electrically connected to the end portion of the extended signal cable.
[0003]
When such an endoscope is used for medical purposes, it is indispensable to surely disinfect and sterilize between cases in order to prevent infectious diseases and the like. Conventionally, this disinfection and sterilization treatment relied on gases such as ethylene oxide gas and disinfectants, but as is well known, sterilization gases are extremely toxic, and sterilization work is complicated to ensure the safety of sterilization work. . In addition, since it takes time to aerate to remove the gas adhering to the device after sterilization, there is a disadvantage that it cannot be used immediately after sterilization, and further, there is a disadvantage that running cost is high. In addition, the disinfection sterilization process using the disinfectant solution has a drawback in that the disinfectant solution is complicated to manage, and the disposing of the disinfectant solution requires a large amount of cost. Therefore, recently, high-temperature and high-pressure steam sterilization called autoclave sterilization, which can be used immediately after sterilization without complicated work and has low running cost, is becoming the mainstream in sterilization treatment for endoscope equipment. is there. This autoclave sterilization is prescribed, for example, in US standard ANSI / AAMIST 37-1992, in which an object to be sterilized is exposed to steam at 132 ° C. at about 2 atm for 4 minutes.
[0004]
In general, an endoscope has a watertight structure with an O-ring, an adhesive, and the like. Also, for example, an electronic component mounted on a circuit board and a circuit board, a junction between a circuit board and a conductor, a conductor and a connector. The joint portion is covered and protected by an epoxy adhesive or a silicone adhesive. However, in autoclave sterilization, high-temperature and high-pressure steam is used, and this high-temperature and high-pressure steam passes through the O-ring and the adhesive and enters the endoscope. Epoxy adhesives and silicone adhesives are highly hygroscopic, and high-temperature and high-pressure steam that has penetrated inside the endoscope can be used, for example, for circuit boards, electronic components mounted on circuit boards, and bonding between circuit boards and conductors. The circuit board and the electronic parts mounted on the circuit board, the circuit board and the conductor, the conductor and the connector, etc. are corroded, etc. Thus, there has been a problem that the endoscope is broken or deteriorated.
[0005]
Therefore, for example, in Japanese Patent Application Laid-Open No. 10-234649, a hermetic connector for airtightly assembling a cover glass at the tip of the inner tube and electrically connecting the inside and outside to the rear end of the tube The endoscope which improves the tolerance with respect to autoclave sterilization by comprising an airtight package and comprising an airtight package and accommodating a protection object member in this airtight package is shown. In addition, in this application, airtight means the airtight of the grade which can endure the high temperature / high pressure steam of autoclave sterilization.
[0006]
[Problems to be solved by the invention]
However, an endoscope having a configuration as disclosed in Japanese Patent Laid-Open No. 10-234649 has a drawback that an outer diameter of the insertion portion is increased because an airtight package is provided in the insertion portion. Further, since the airtight package is provided, there is a disadvantage that the cost is increased.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an endoscope capable of reducing the diameter of the insertion portion and reducing the cost while improving the resistance to autoclave sterilization.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, an endoscope of the present invention has an imaging surface for imaging a subject image, and a rear end surface of a cover glass joined to a rear end surface of a field lens disposed in front of the imaging surface. A solid-state imaging device joined to the solid-state imaging device, a circuit board disposed behind the solid-state imaging device and electrically connected to the solid-state imaging device at a first electrical joint, and arranged behind the circuit board. An endoscope having a signal cable that is provided and electrically connected to the circuit board at a second electrical joint, and a connector that is electrically connected to the signal cable at a third electrical joint. , The lens holding frame holding the objective optical system for entering the subject light is watertightly joined to the rear end portion of the lens, and the field lens is covered with the inner peripheral surface only at the rear end portion and fixed in a watertight manner. Oyo the solid-while Wherein for the circuit board not abut, and with these solid-state imaging device and disposed in the free position of covering the circuit board insulating frame, the tip portion of the signal cable from the outer periphery of a rear end of the insulating frame A heat-shrinkable tube disposed over the outer periphery so as to cover the rear end of the insulating frame, the solid-state imaging device, the first electrical joint, the circuit board, and the second joint; and the field A portion formed by the rear end surface of the lens, the front end portion of the signal cable, and the inner peripheral surface of the heat-shrinkable tube is filled, and the first electrical junction, the circuit board, and the second electrical junction are filled. And fluorinated rubber for sealing the portion.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
1 to 3 relate to a first embodiment of the present invention, FIG. 1 is an explanatory view showing the configuration of an endoscope, FIG. 2 is a cross-sectional view showing the configuration of a distal end portion, and FIG. 3 is a configuration of a CCU connector. FIG.
[0009]
As shown in FIG. 1, the endoscope 1 of the present embodiment includes, for example, an elongated insertion unit 2 that is inserted into a body cavity and irradiates a subject with illumination light, picks up a subject image, and obtains an imaging signal. An operation unit 3 that is connected to the proximal end side of the insertion unit 2 and that grips and operates the endoscope 1, for example, extends from the side or proximal end of the operation unit 3 and is connected to an external device. Universal light guide 4, a light guide connector 5 provided at an end of the universal cord 4 and detachably connected to a light source device (not shown) which is an external device, for example, extending from the side of the light guide connector 5 A CCU cable 6 connected to a CCU (camera control unit) (not shown), which is an external device that performs image signal processing on an imaging signal obtained by the endoscope 1, and an end of the CCU cable 6 are attached to and detached from the CCU. It is constructed and a CCU connector 7 connected to the stationary, and has a watertight structure by like not shown such as O-ring and adhesive.
[0010]
The insertion portion 2 is connected to the distal end side of the operation portion 3 and is elongated and inserted into a body cavity. The insertion portion 2 is connected to the distal end side of the serpentine tube portion 11 and can be freely operated by the operation portion 3. It comprises a bending portion 12 that bends and a hard tip portion 13 that is connected to the tip side of the bending portion 12. The operation unit 3 includes a bending operation lever 14 that operates the bending unit 12 so as to be freely bent.
[0011]
As shown in FIG. 2, the distal end portion 13 is inserted through the body frame 21 of the distal end portion 13, the insertion portion 2, the operation portion 3, and the universal cord 4, and the light incident end is the light guide connector 5. A light guide end disposed on the light guide 22, an illumination lens 23 that distributes the illumination light guided by the light guide 22 toward the subject, and an imaging device 24 that captures the subject image. Has been.
[0012]
The imaging device 24 includes a front end frame 25 for assembling the imaging device 24 to the main body frame 21, a cover glass 26 assembled in an airtight manner on the inner periphery of the front end portion of the front end frame 25, and a rear end side of the cover glass 26. A substantially cylindrical lens frame 31, an objective lens group 32 that is assembled in the lens frame 31 and forms a subject image, and is fitted onto the rear end of the lens frame 31 and fixed with an adhesive or the like. In addition, a substantially cylindrical insulating frame 33 whose front end portion is airtightly fixed to the inner periphery of the rear end portion of the front end frame 25, and a cover glass 34 airtightly fixed to the rear end portion of the insulating frame 33, A CCD 35 that is joined to the rear end surface of the cover glass 34 and obtains an imaging signal by capturing a subject image, and is arranged behind the CCD 35 while being electrically joined to the CCD 35 by solder or the like, for example, to increase the imaging signal. A circuit board 36 on which a circuit or the like is configured, an electronic component 37 including, for example, a capacitor mounted on the circuit board 36, and a rear end of the insulating frame 33, and the periphery of the CCD 35 and the circuit board 36. For example, a substantially cylindrical metal shield frame 38 to be shielded, a plurality of conductors 39 electrically connected to the circuit board 36 by solder or the like, and extending rearward of the circuit board 36, and the plurality of conductors 39 Are connected to the rear end of the shield frame 38 and tightened to hold the outer periphery of the front end of the signal cable 40, and the rear end surface of the CCD 35. To the front end of the signal cable 40, and the electrical contacts of the CCD 35, the circuit board 36, the electronic component 37, and the electrical conductors 39. It is constituted by a sealant 42 for sealing the periphery of the point. The signal cable 40 is inserted through the insertion portion 2, the operation portion 3, the universal cord 4, and the CCU cable 6, and the other end is electrically connected to the CCU connector 7. The circuit board 36 may be, for example, a rigid board or a flexible board. Further, the sealing agent 42 is made of an insulating fluorine-based rubber having low vapor permeability, and this fluorine rubber is made of, for example, fluorine-based silicone resin, fluorinated polyether, or perfluoropolyether polymer. The main component.
[0013]
As shown in FIG. 3, the CCU connector 7 includes an end portion of the CCU cable 6, a substantially cylindrical shape, and a frame 51 in which the CCU cable 6 is inserted from one hole, and the frame A lid 52 that closes the other hole of the body 51, a plurality of pins 53 that are fixed through the lid 52 and electrically connect the inside and outside of the frame body 51, and inside the frame body 51, the pin 53 An end portion of the conducting wire 39 that is electrically joined with solder or the like, and a sealant 54 that seals the joining portion between the pin 53 and the conducting wire 39 inside the frame 51 are configured. The sealant 54 is made of an insulating fluorine-based rubber having low vapor permeability, and the fluorine rubber is mainly composed of, for example, a fluorine-based silicone resin, a fluorinated polyether, or a perfluoropolyether polymer. It is said.
[0014]
Next, the operation of this embodiment will be described.
When the autoclave sterilization is performed on the endoscope 1, steam generated by the autoclave sterilization passes through an O-ring portion and an adhesive portion (not shown) and enters the endoscope 1. At this time, the electrical joint between the CCD 35 and the circuit board 36 in the tip portion 13, the circuit board 36, the electronic component 37 on the circuit board 36, and the electrical joint between the conductor 39 and the circuit board 36 are as follows: It is sealed with a sealant 42 having a low vapor permeability and a low hygroscopic property, and damage and deterioration of these parts due to autoclave sterilization steam are prevented. The electrical joint between the pin 53 and the conductor 39 in the CCU connector 7 is sealed with a sealant 54 having low vapor permeability and low hygroscopicity, and rusting of these parts due to autoclave sterilization steam. Damage and deterioration are prevented.
[0015]
As described above, according to the present embodiment, resistance to autoclave sterilization is improved.
In addition, since resistance to autoclave sterilization can be obtained even if the imaging device is not housed in an airtight package, the diameter of the insertion portion 2 can be reduced compared to a configuration in which the imaging device is housed in an airtight package, and the cost can be reduced. It becomes possible.
Therefore, according to the present embodiment, it is possible to obtain an effect that the insertion portion is reduced in diameter and the cost can be reduced while the resistance to autoclave sterilization is improved.
In addition, since the electrical joint portion that is easily damaged due to disconnection or the like when external force is applied is covered with the sealants 42 and 54, the mechanical resistance of the electrical joint portion against external force is improved.
[0016]
(Second Embodiment)
FIG. 4 is a cross-sectional view showing the configuration of the tip portion according to the second embodiment of the present invention.
As shown in FIG. 4, in this embodiment, a tip 101 is provided in place of the tip 13 (see FIG. 2) of the first embodiment. Other configurations are the same as those of the first embodiment.
[0017]
The front end 101 includes a main body frame 102 configured substantially the same as the main body frame 21 (see FIG. 2) of the first embodiment, and a light guide 22 (see FIG. 2) of the first embodiment. The light emitting end portion of the light guide 103 configured similarly to the above, the illumination lens 104 configured similarly to the illumination lens 23 (see FIG. 2) of the first embodiment, and the first embodiment Imaging device 24 (see FIG. 2), and an imaging device 105 provided in place of the imaging device 24.
[0018]
The imaging device 105 includes a lens frame 111 that is fitted and fixed in a through-hole of the main body frame 102 and formed in a substantially cylindrical shape, a cover glass 112 that is watertightly assembled to the inner periphery of the distal end portion of the lens frame 111, and An objective lens group 113 assembled in the lens frame 111, an insulating frame 114 fitted and watertightly joined to the rear end portion of the lens frame 111, and a rear end of the insulating frame 114 A field lens 115 that is watertightly fixed to the inner periphery of the unit, a cover glass 116 that is bonded to the rear end surface of the field lens 115, and a rear glass that is bonded to the rear end surface of the cover glass 116 to capture a subject image and obtain an imaging signal. The CCD 117, a plurality of lead wires 118 extending rearward from the side surface of the CCD 117, and the lead wires 118 are electrically joined, and the front A circuit board 119 held by a lead wire 118, electrically connected to the circuit board 119 with solder or the like, and extended to the rear to transmit imaging signals or the like; and The signal cable 121 bundled with the conductive wire 120 is provided from the rear end surface of the circuit board 119 to the front end portion of the signal cable 121, and the periphery of the electrical joint between the circuit board 119 and the conductive wire 120 is sealed. And a sealing agent 122 to be stopped. The circuit board 119 may be, for example, a rigid board or a flexible board. The sealant 122 is made of an insulating fluorine-based rubber having low vapor permeability, and the fluorine rubber is made of, for example, a fluorine-based silicone resin, a fluorinated polyether, or a perfluoropolyether polymer. The main component.
[0019]
Next, the operation of this embodiment will be described.
When autoclave sterilization is performed on an endoscope, steam generated by autoclave sterilization passes through an O-ring portion and an adhesive portion (not shown) and enters the endoscope. At this time, the electrical joint between the circuit board 119 and the conductive wire 120 is sealed with a sealant 122 having low vapor permeability and low hygroscopicity, and damage and deterioration of these parts due to autoclave sterilization steam are prevented. Is prevented. In addition, since the portion surrounded by the lens frame 111, the cover glass 112, the insulating frame 114, and the field lens 115 has a watertight structure, the invasion of steam by autoclave sterilization into the inside is prevented.
[0020]
As described above, according to the present embodiment, resistance to autoclave sterilization is improved.
In addition, the resistance to autoclave sterilization can be obtained even if the imaging device is not housed in an airtight package, so that the insertion portion can be made thinner and less expensive than the construction in which the imaging device is housed in an airtight package. It becomes.
Therefore, according to the present embodiment, it is possible to obtain an effect that the insertion portion is reduced in diameter and the cost can be reduced while the resistance to autoclave sterilization is improved.
In addition, since the electrical joint that is easily damaged due to disconnection or the like when external force is applied is covered with the sealant 122, the mechanical resistance of the electrical joint against external force is improved.
Further, since the invasion of vapor into the portion surrounded by the lens frame 111, the cover glass 112, the insulating frame 114, and the field lens 115 is hindered, it is possible to prevent the optical system provided therein from being fogged with vapor. .
[0021]
(Third embodiment)
FIG. 5 is a cross-sectional view showing the configuration of the tip portion according to the third embodiment of the present invention.
In the present embodiment, parts that are configured in the same manner as in the second embodiment are given the same reference numerals, and descriptions thereof are omitted.
[0022]
As shown in FIG. 5, in this embodiment, a tip portion 201 is provided instead of the tip portion 101 (see FIG. 4) of the second embodiment. The distal end portion 201 is configured by providing an imaging device 202 in place of the imaging device 105 (see FIG. 4) of the second embodiment.
[0023]
The imaging device 202 is configured in substantially the same manner as the imaging device 105 (see FIG. 4) of the second embodiment, and further, the insulating frame extends from the outer periphery of the rear end portion of the insulating frame 114 to the side surface of the circuit board 119. A heat shrinkable tube 211 that covers the rear end of 114, the CCD 117, and at least a part of the lead wire 118, the insulating frame 114, the front end surface of the circuit board 119, and the inner peripheral surface of the heat shrinkable tube 211. And a filler 212 filled in a portion to be surrounded. The filler 212 has a low vapor permeability and is made of an insulating fluorine-based rubber. The fluorine rubber is mainly composed of, for example, a fluorine-based silicone resin, a fluorinated polyether, or a perfluoropolyether polymer. Yes. The heat shrinkable tube 211 may be formed of a material having low vapor permeability such as a fluororesin.
[0024]
Next, the operation of this embodiment will be described.
When autoclave sterilization is performed on the endoscope, steam generated by autoclave sterilization enters the endoscope. At this time, the electrical joint between the circuit board 119 and the conductive wire 120 is sealed with a sealant 122 having low vapor permeability and low hygroscopicity, and damage and deterioration of these parts due to autoclave sterilization steam are prevented. Is prevented. In addition, since the portion surrounded by the lens frame 111, the cover glass 112, the insulating frame 114, and the field lens 115 has a watertight structure, the invasion of steam by autoclave sterilization into the inside is prevented.
Further, the heat shrinkable tube 211 and the filler 212 prevent vapor from entering the interior surrounded by the heat shrinkable tube 211 by autoclave sterilization.
[0025]
According to the present embodiment described above, the same effect as in the second embodiment can be obtained.
Moreover, according to this Embodiment, the tolerance with respect to autoclave sterilization of CCD117 and its lead wire 117 improves.
[0026]
(Fourth embodiment)
FIG. 6 is a cross-sectional view showing the configuration of the tip portion according to the fourth embodiment of the present invention.
In the present embodiment, parts that are configured in the same manner as in the third embodiment are given the same reference numerals, and descriptions thereof are omitted.
[0027]
As shown in FIG. 6, in this embodiment, a tip portion 301 is provided in place of the tip portion 201 (see FIG. 5) of the third embodiment. The distal end portion 301 is configured by providing an imaging device 302 in place of the imaging device 202 (see FIG. 5) of the third embodiment.
[0028]
The imaging device 302 is configured in substantially the same manner as the imaging device 202 (see FIG. 5) of the third embodiment, but the heat shrinking tube 211 (see FIG. 5) of the third embodiment. Instead, a heat shrinkable tube 311 is provided, and a filler 312 is provided in place of the filler 212 (see FIG. 5) and the sealant 122 (see FIG. 5) of the third embodiment.
[0029]
The heat shrinkable tube 311 extends from the outer periphery of the rear end of the insulating frame 114 to the outer periphery of the front end of the signal cable 121, the rear end of the insulating frame 114, the CCD 117, the lead wire 118, the circuit board 119, and the signal cable 121 of the conducting wire 120. It is provided so as to cover the extending portion from the. Further, the filler 312 is provided by being filled in a portion surrounded by the rear end surface of the field lens 115, the distal end portion of the signal cable 121, and the inner peripheral surface of the heat shrinkable tube 311. The filler 312 has a low vapor permeability and is made of an insulating fluorine-based rubber. The fluorine rubber has, for example, a fluorine-based silicone resin, a fluorinated polyether, or a perfluoropolyether polymer as a main component. Yes. Further, the heat shrinkable tube 311 may be formed of a material having low vapor permeability such as a fluororesin, for example.
[0030]
Next, the operation of this embodiment will be described.
When autoclave sterilization is performed on the endoscope, steam generated by autoclave sterilization enters the endoscope. At this time, since the portion surrounded by the lens frame 111, the cover glass 112, the insulating frame 114, and the field lens 115 has a watertight structure, the intrusion of steam into the interior by autoclave sterilization is prevented.
Further, the heat shrinkable tube 311 and the filler 312 prevent vapor from entering the interior surrounded by the heat shrinkable tube 211 by autoclave sterilization. That is, the vapor is prevented from reaching the CCD 117, the lead wire 118, and the circuit board 119.
[0031]
According to the present embodiment described above, the same effect as in the third embodiment can be obtained.
Further, according to the present embodiment, since the entire lead wire 118 is surrounded by the heat-shrinkable tube 311, the resistance to autoclave sterilization is improved accordingly. In addition, since the joint between the circuit board 119 and the conductive wire 120 is surrounded by the heat-shrinkable tube 311, the resistance to autoclave sterilization is improved accordingly.
[0032]
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention.
For example, the electrical junction between the CCD and the circuit board may be configured by directly joining the CCD electrode and the circuit board electrode, or joining the CCD electrode and the circuit board electrode via a lead wire. Alternatively, the electrode of the CCD and the electrode of the wiring board for connection extending from the circuit board may be joined.
Further, for example, the endoscope may be a flexible mirror having a soft insertion portion or a rigid endoscope having a rigid insertion portion.
[0033]
[Appendix]
(Additional item 1)
A solid-state image sensor that captures a subject image, a circuit board that is electrically connected to the solid-state image sensor at a first electrical junction, and an electrical connection that is connected to the circuit board at a second electrical junction. An endoscope having a signal cable and a connector electrically connected to the signal cable at a third electrical joint,
And a fluororubber for sealing at least one of the first electrical joint, the circuit board, the second electrical joint, and the third electrical joint. Endoscope.
[0034]
(Appendix 2)
The endoscope according to appendix 1, wherein
The fluororubber contains a fluorinated silicone resin as a main component.
[0035]
(Additional Item 3)
The endoscope according to appendix 1, wherein
The fluororubber is mainly composed of a perfluoropolyether polymer.
[0036]
(Appendix 4)
An objective lens, a solid-state imaging device that receives a subject image formed by the objective lens, a substrate electrically connected to the solid-state imaging device, a signal cable electrically connected to the substrate, An imaging unit having a signal cable and a connector electrically connected;
An endoscope characterized in that at least a part of an electrical joint portion of the imaging unit is covered with a sealant made of fluororubber.
[0037]
(Appendix 5)
The endoscope according to appendix 4, wherein
The electrical junction is provided on the substrate.
[0038]
(Appendix 6)
The endoscope according to appendix 4 or 5, wherein
The electrical joint is provided in the connector.
[0039]
(Appendix 7)
The endoscope according to appendix 4, 5 or 6, wherein
The sealing agent contains a fluorinated silicone resin as a main component.
[0040]
(Appendix 8)
The endoscope according to appendix 4, 5 or 6, wherein
The sealing agent contains a perfluoropolyether polymer as a main component.
[0041]
(Appendix 9)
The endoscope according to appendix 1, wherein
The fluororubber is mainly composed of a fluorinated polyether.
[0042]
(Appendix 10)
The endoscope according to appendix 4, 5 or 6, wherein
The sealant contains fluorinated polyether as a main component.
[0043]
【The invention's effect】
As described above, according to the present invention, it is possible to obtain an effect that the insertion portion is reduced in diameter and the cost can be reduced while the resistance to autoclave sterilization is improved.
[Brief description of the drawings]
FIGS. 1 to 3 relate to a first embodiment of the present invention, and FIG. 1 is an explanatory view showing a configuration of an endoscope. FIG. 2 is a cross-sectional view showing a configuration of a distal end portion. FIG. 4 is a cross-sectional view showing a configuration of a CCU connector. FIG. 4 is a cross-sectional view showing a configuration of a tip portion according to the second embodiment of the present invention. FIG. 6 is a cross-sectional view showing the structure of the tip according to the fourth embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 ... Endoscope 7 ... CCU connector 13 ... End part 35 ... CCD
36 ... Circuit board 39 ... Lead wire 42 ... Sealant 53 ... Pin 54 ... Sealant 117 ... CCD
119: Circuit board 120: Conductor 122 ... Sealant 212 ... Filler 122 ... Sealant 312 ... Filler

Claims (1)

A solid-state image pickup device having an image pickup surface for picking up a subject image and bonded to a rear end surface of a cover glass bonded to a rear end surface of a field lens disposed in front of the image pickup surface; and a rear side of the solid-state image pickup device A circuit board that is electrically connected to the solid-state imaging device at a first electrical joint, and is disposed behind the circuit board, and the circuit board at a second electrical joint. In an endoscope having a signal cable electrically connected and a connector electrically connected to the signal cable at a third electrical joint,
While being watertightly joined to a rear end portion of a lens holding frame that holds an objective optical system for entering subject light, the field lens is covered with an inner peripheral surface only at the rear end portion and fixed in a watertight manner. and in the solid-state imaging device and the respect to the circuit board without contact, and an insulating frame arranged in no position of covering these solid-state imaging device and the circuit board,
From the outer periphery of the rear end of the insulating frame to the outer periphery of the front end of the signal cable, the rear end of the insulating frame, the solid-state imaging device, the first electrical joint, the circuit board, and the second joint A heat-shrinkable tube disposed to cover
A portion formed by a rear end surface of the field lens, a front end portion of the signal cable, and an inner peripheral surface of the heat-shrinkable tube is filled, and the first electric joint portion, the circuit board, and the second electric portion are formed. Fluorine-based rubber that seals the mechanical joint,
An endoscope characterized by comprising:

Images