JPH074338B2 - Endoscope - Google Patents

Description

Description: [Industrial field of use] The present invention relates to an endoscope capable of protecting a built-in object without increasing its diameter.

[Problems to be Solved by the Related Art and Invention] Conventionally, an endoscope is provided in a distal end constituent member and in a space on the hand side of the distal end constituent member as disclosed in JP-A-61-163316. , A light guide fiber, a solid-state image sensor, a peripheral circuit, forceps channels, etc. are arranged, and the periphery is covered with a protective member (generally also serving as a curved portion) made of a metal pipe material, and the tip of the endoscope is external It protected the internal components from damage from the impact from. However, the wall thickness of the protective member is required to be about 0.25 mm in view of the strength of the pipe itself, and further, a clearance of about 0.1 mm is required between the protective member and the built-in object for assembly work. Under such circumstances, there is a problem in that the endoscope becomes thicker if it is attempted to surround the entire circumference with the protective member.

[Object of the Invention] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an endoscope that protects built-in objects and that can reduce the diameter of an insertion portion.

[Means and Actions for Solving Problems] According to the present invention, a part of a protective member externally fitted to a tip forming member is notched, and a tip forming member corresponding to the notch is extended to a hand side. The internal components are protected by.

[Embodiment] FIGS. 1 to 3 relate to an embodiment of the present invention. FIG. 1 is an enlarged sectional view of a distal end portion of an endoscope, and FIG. 2 is AA 'in FIG.
FIG. 3 is a sectional view taken along line BB 'in FIG.

The distal end portion 2 of the endoscope insertion portion 1 includes a substantially cylindrical distal end constituent member 3 made of a hard material such as metal. An observation through hole 4, a forceps channel through hole 6, an illumination through hole (not shown), and an air / water supply channel through hole are formed in the distal end constituent member 3 so as to penetrate in parallel with the longitudinal direction of the insertion portion 1. ing.

The tip constituent member 3 may be a plastic molded product, a ceramic molded product, or a metal die cast, but it is preferable that it is insulative. When using a conductive material, it is desirable to apply insulation coating on the outer periphery.

An objective lens frame 9 is fitted into the observation through hole 4 and sealed with, for example, a silicon-based filling material, and a positioning pin is provided.
Positioned by 10. The objective lens frame 9 includes an objective lens system 11 and a circular second cover glass 12
Are mounted by being positioned by the step portion 13 and the spacer 14 of the objective lens frame 9. The focus is adjusted by changing the thickness of the spacer 14.

An element support frame 16 such as a shield film is inserted and fixed at the rear end of the objective lens frame 9, and the element support frame 16 positions the imaging surface at the image forming position of the objective lens system 11. The solid-state imaging device 17 thus arranged is held. The objective lens frame 9 and the element support frame 16 are electrically connected as a noise countermeasure.

On the image area of the solid-state image sensor 17 provided with optical black, for example, red (R), green (G),
A rectangular first cover glass 18, which also serves as a color filter array in which color filters for transmitting the respective three primary colors of blue (B) are arranged in a mosaic pattern, is provided in an overlapping manner so that the optical path centers of the objective lens system 11 coincide with each other. Is joined to. Further, for example, six element-side bonding pads 19 are provided on one side slightly wider in the periphery of the image area.

Inside the element support frame 16, as shown in FIG.
An electronic component 20 such as a CCD drive circuit is mounted,
A base substrate 21, such as a multilayer ceramic substrate, is provided. At the front end of the base substrate 21, for example, a metal die bonding pad member 22 is a base substrate.
It is mechanically and electrically connected at a right angle to 21.

The solid-state imaging device 17 is die-bonded to the front surface of the die-bonding pad member 22.

For example, six base side bonding pads 23 are provided on the front end surface of the base substrate 21, and are connected to the element side bonding pads 19 provided on the solid-state image pickup device 17 by bonding wires 24. It is sealed together with the periphery of the solid-state imaging device 17 by an insulating sealing member 26. At the rear end of the base substrate 21, a cable fixing member 28 for holding a signal cable 27 such as a shield wire, which is inserted into the insertion portion 1, is provided on the base substrate 21.
A signal cable 27, which is mechanically and electrically connected substantially at right angles to the
Connected to 21. The space inside the element support frame 16 is filled with a sealing member 26 such as epoxy resin.

On the other hand, a forceps channel connection pipe 29 is fitted on the rear end side of the forceps channel through hole 6. The forceps channel connection pipe 29 has a rear end portion that is enlarged in diameter, and a forceps channel tube 25 that forms a forceps channel 31 is inserted into the insertion portion 1 and connected to the rear end portion.

Further, a light distribution lens system (not shown) is attached to the illumination through hole (not shown), and a light guide 33 covered with a tube 32 is connected to the rear end of the light distribution lens system as shown in FIG. Has been done. An air / water supply nozzle (not shown) is attached to the air / water supply channel through hole (not shown), and the air / water supply nozzle forms an air / water supply channel 34 as shown in FIG. The water supply tube 36 is connected.

In this embodiment, two light guides 33 and one air / water supply channel 34 are provided.

As shown in FIG. 2, the rear end portion of the tip component member 3 is provided in the vicinity of the outer periphery of the element support frame 16 for protecting the element support frame 16.
Individual extending portions 40a, 40b, 40c are provided, and the upper and lower extending portions 40a, 40c are stepped portions 43a, 4 to be fitted with a protection member 37 described later.
3c is provided. The extending portions 40a, 40b, 40c may be connected to the adjacent extending portions 40a, 40b, 40c. A slight clearance is provided between the element support frame 16 and the extending portions 40a, 40b, 40c for convenience of assembly.

On the other hand, a large number of substantially annular indirect pieces 39 are rotatably connected in the longitudinal direction to the curved portion 38 adjacent to the rear of the distal end portion 2, and the indirect piece 39 at the front end is provided with a protection member 37 described later. It is rotatably connected to a bending shaft 42 provided at the rear end.

The protection member 37 has a substantially annular shape and the extension 40 at the front end.
A first notch portion 35a is provided at a position corresponding to a, 40c, and a second notch portion is provided in the vicinity of the connection portion between the forceps channel connection pipe 29 and the forceps channel tube 25 inserted into the forceps channel through hole 6. 35 b is provided and is externally fitted and fixed to the rear end portion of the tip component member 3 by a fixing screw 30.

The indirect piece 39 is housed in a braid 44 formed by braiding fine wires of metal or the like in a net shape, and the tip portion 2 and the curved portion 38 are contained.
Is covered with a curved tube rubber 41 as an outer cover. The tip portion of the curved tube rubber 41 is externally fitted to the tip constituent member 3 and is fixed by, for example, an adhesive after winding the thread.

In the present embodiment configured as described above, the element support frame 16 accommodating the objective lens frame 9 and the solid-state imaging device 17, the base substrate 21, and the cable fixing member 28 arranged in the tip end constituent member 3 is extended. The light guide 33 and the air / water channel 34 are protected by the outlets 40a, 40b, 40c, and are protected by the protective member 37. In addition, the part where the built-in object itself such as the forceps channel connection pipe 29 has strength is
By notching the protective member 37, the space inside the distal end portion 2 is effectively used, and the thickness of the protective member 37 is reduced.

If you try to protect the entire circumference with only the tip component instead of the conventional protection member, you will not be able to assemble the built-in object to the tip component, so keep the extension part open and the others open. It is advisable to assemble the internal components and then cover with a protective member.

Although the electronic endoscope using the solid-state image sensor is described in this embodiment, the present invention may be applied to a fiberscope using an image guide.

[Effects of the Invention] As described above, according to the present invention, it is possible to effectively dispose the protective member at the distal end of the endoscope insertion portion to protect the built-in object and reduce the outer diameter of the distal end portion. The effect is that you can do it.

[Brief description of drawings]

1 to 3 relate to a first embodiment of the present invention.
The figure shows an enlarged cross-sectional view of the distal end portion of the endoscope, and FIG. 2 shows A- in FIG.
FIG. 3 is a sectional view taken along line BB 'in FIG. 1 ... Insertion part, 2 ... Tip part 3 ... Tip component member, 35a ... First notch part 35b ... Second notch part, 37 ... Protective member 40b ... Extension part

Claims (1)

[Claims] 1. An endoscope in which a weakly built-in object such as a light guide fiber is disposed in a space on the hand side of a tip forming member, and the periphery of the built-in object is surrounded by a protective member, An endoscope characterized in that a notch portion is provided in a part thereof, a portion of a tip forming member corresponding to the notch portion is extended to a hand side, and a built-in object is surrounded by a protective member and an extension portion. .