JP4185196B2 - Endoscope - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endoscope in which an observation image is captured by a solid-state image sensor.
[0002]
[Prior art]
In an electronic endoscope, a solid-state imaging device for capturing an endoscope observation image formed by an objective optical system is attached to a substrate and built in the distal end of an insertion portion. And the conductive wire of a signal cable is connected to a board | substrate by soldering etc., and the adhesive agent is apply | coated and reinforced at the connection part of a conductive wire and a board | substrate.
[0003]
[Problems to be solved by the invention]
However, if a thin conductive wire is used for the signal cable in order to make the insertion portion of the endoscope as thin as possible, the mechanical strength of the conductive wire is reduced. May break.
[0004]
Also in an endoscope in which an image guide fiber bundle is used for transmission of an observation image in the insertion portion, and a solid-state imaging device for imaging an endoscope observation image is arranged on an adapter detachable from the eyepiece portion. The same conductive wire breakage problem may occur.
[0005]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an endoscope having excellent durability that does not cause a disconnection even when a thin conductive wire is used for a signal cable connected to a substrate of a solid-state imaging device.
[0006]
[Means for Solving the Problems]
To achieve the above object, an endoscope according to the present invention is an endoscope in which a conductive wire of a signal cable is connected to a substrate on which a solid-state imaging device for capturing an endoscopic observation image is attached. An insulating thread material is inserted into the signal cable in the axial direction, and a tip portion of the thread material is fixed to the substrate.
[0007]
The conductive wire is preferably connected to the substrate in a state of being loosened from the yarn material, and an adhesive is applied to a connection portion between the conductive wire and the substrate, and the adhesive is used for the yarn. A material may be bonded to the substrate.
[0008]
A plurality of the thread materials may be arranged in parallel, and the thread material may be formed of cotton yarn.
The solid-state imaging device may be disposed in the distal end of the insertion portion of the endoscope, and the solid-state imaging device may be disposed in an adapter that is detachable from the eyepiece portion of the endoscope.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 2 schematically shows the endoscope according to the first embodiment of the present invention. The insertion portion 1 whose base end is connected to the operation portion 2 includes a flexible tube portion 11 and an operation portion 2. The bending portion 12 is connected to the distal end of the flexible tube portion 11 so as to be bent by remote operation, and the distal end portion body 13 is built in the objective optical system 14 and connected to the distal end of the bending portion 12.
[0010]
An endoscope observation image formed by the objective optical system 14 is picked up by a solid-state image pickup device 20 built in the distal end portion body 13, and the picked-up image signal is inserted from the flexible tube portion 11 into the operation portion 2. It is transmitted by the arranged signal cable 30.
[0011]
FIG. 3 shows the internal structure of the flexible tube portion 11, 15 is a guide coil through which an operation wire for remotely operating the bending portion 12 is inserted, and 16 is an illumination light for illuminating the subject. The light guide fiber bundle 17 is a tube for air supply and water supply, and 18 is a forceps channel. A signal cable 30 is inserted in parallel with these built-in components.
[0012]
FIG. 4 shows the structure of the signal cable 30. A shield net tube 32 is disposed inside an electrically insulating outer sheath 31, and an insulating core cable 33 (conductive wire) and a coaxial core cable 34 (conductive) are disposed therein. Line) and an electrically insulating cotton thread 35 are inserted and arranged in parallel.
[0013]
In this embodiment, the insulated core cable 33 is arranged at the axial position of the signal cable 30, and a large number of coaxial cable 34 and cotton yarns 35 are alternately arranged around it.
[0014]
The insulated core cable 33 is configured by covering a conductor 331 with an insulating outer sheath 332, and the coaxial core cable 34 is formed by covering the conductor 341 with an insulator 342, and a shielding net tube 343 between the outer periphery and the insulating outer sheath 344. Is arranged.
[0015]
FIG. 1 shows the distal end portion of the signal cable 30 built in the distal end portion main body 13 and the vicinity of the solid-state imaging device 20, and the electric insulation is provided inside the metal shield tube 22 fixed to the distal end portion main body 13. The insulating cylinder 23 is arranged, and the substrate 21 is fixed inside thereof.
[0016]
The solid-state imaging device 20 is fixed to the substrate 21 with a gap, and a cover glass 24 is attached to the surface of the imaging surface. Various electronic circuits 25 and 26 are attached to both front and rear surfaces of the substrate 21.
[0017]
An insulating core cable 33 and a coaxial cable 34 of the signal cable 30 are connected to the rear surface side of the substrate 21 by soldering or the like, and an adhesive 29 is applied to the connection portion so as to rise.
[0018]
The tip portion of the cotton yarn 35 is bonded and fixed to the substrate 21 by the adhesive 29, and the insulated core cable 33 and the coaxial core cable 34 are assembled so that they are loose even when the cotton yarn 35 extends into a pin. .
[0019]
As a result, even if the flexible tube portion 11 and the bending portion 12 are repeatedly bent and the signal cable 30 is pulled, the force is mainly received by the cotton yarn 35, and the insulated core cable 33 and the coaxial core cable 34 have a large tension. Therefore, even if the insulating core cable 33 and the coaxial core cable 34 are made considerably thin, there is no fear of disconnection, and the insertion portion 1 can be made as thin as possible to improve the insertability.
[0020]
FIG. 5 shows an endoscope according to the second embodiment of the present invention. An endoscope observation image transmitted to the eyepiece unit 3 by the image guide fiber bundle 19 inserted into the insertion unit 1 is shown. Magnified through the eyepiece 4 and observed with the naked eye.
[0021]
Then, an endoscopic observation image is picked up by a solid-state image pickup device 51 arranged in a TV camera adapter 50 detachably attached to the eyepiece 3, and an image pickup signal is sent out by a signal cable 53 connected to the substrate 52. .
[0022]
A reinforcement structure using cotton yarn 35 similar to that of the first embodiment shown in FIG. 1 is used at the connection portion between the signal cable 53 and the substrate 52 in the TV camera adapter 50.
[0023]
In addition, this invention is not limited to said embodiment, For example, it can replace with the cotton thread 35 and can use various electrically insulating thread materials.
[0024]
【The invention's effect】
According to the present invention, even when the signal cable is pulled, the electrically insulating thread material inserted into the signal cable is fixed to the substrate to which the solid-state imaging device for capturing the endoscope observation image is attached. Since a large tension does not act on the conductive wire, even if a thin conductive wire is used for the signal cable, there is no fear of disconnection and excellent durability can be obtained, and as a result, the endoscope insertion portion can be made thin. Etc. are possible.
[Brief description of the drawings]
FIG. 1 is a side cross-sectional view of a front end portion of a signal cable and a vicinity of a solid-state imaging device according to a first embodiment of the present invention.
FIG. 2 is a schematic view of the endoscope according to the first embodiment of the present invention.
FIG. 3 is a cross-sectional perspective view of the insertion portion of the endoscope according to the first embodiment of the present invention.
FIG. 4 is a cross-sectional perspective view of the signal cable according to the first embodiment of the present invention.
FIG. 5 is a schematic view of an endoscope according to a second embodiment of the present invention.
[Explanation of symbols]
20 Solid-state imaging device 21 Substrate 30 Signal cable 33 Insulated core cable (conductive wire)
34 Coaxial core cable (conductive wire)
35 Cotton yarn (thread material)

Claims (6)

In an endoscope in which a conductive wire of a signal cable is connected to a substrate on which a solid-state imaging device for capturing an endoscope observation image is attached,
Electrically insulating strand material is inserted axially into the signal cable, the tip portion of the thread material is secured to the substrate, the conductive wire is connected to the substrate in a slack state from the yarn material An endoscope characterized by having It has adhesive is applied to the connection portion between the conductive lines and the substrate, an endoscope according to claim 1 Symbol mounting the thread member is bonded to the substrate by the adhesive. The endoscope according to claim 1 or 2, wherein a plurality of the thread materials are arranged in parallel. The endoscope according to claim 1, 2 or 3, wherein the thread material is formed of cotton thread. The endoscope according to claim 1, 2, 3, or 4 , wherein the solid-state imaging device is disposed in a distal end of an insertion portion of the endoscope. The endoscope according to claim 1, 2, 3, or 4 , wherein the solid-state imaging device is disposed in an adapter that is detachable from an eyepiece of the endoscope.

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