JPH08150113A - Endoscope device - Google Patents

Abstract

PURPOSE: To provide an endoscope device whose tip portion structure is simplified and is structured inexpensively and whose assembly or the like workability can be improved. CONSTITUTION: The tip hard portion 8 of an endoscope is equipped with a cap integral type head 9 made of resin and units (a forceps hole 16, a water supply hole 17, a water supply hole 18, an illumination optical system 19, an object image pick up system 20) 19 to be assembled through the insertion holes 12 of the cap integral type head 9. The respective tip portions of the forceps hole 16 and the object image pick up system 20 and fixed by screwing screws SR other than tapping screws into underholes 13 smaller than their outer diameters. Also, the respective tip portions of the water supply hole 17, the water supply hole 18, and the illumination optical system 19 are fixed by pushing them into insertion holes 12 by the method of press-in or snap fit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope device,
In particular, it relates to the tip structure of an endoscope and adjustment of the optical axis length of an objective optical system forming a part of the tip structure.

[0002]

2. Description of the Related Art Conventionally, an endoscope scope (hereinafter, simply referred to as "scope") has a structure in which a tip portion having various functions is shown in, for example, FIGS.

Here, the manufacturing (assembling) method relating to the distal end structure of the scope will be described. First, as shown in FIGS. 13A and 13B, the head 100, which is a metal fixing support member, is first described. The tip placement parts (hereinafter collectively referred to as “unit”) 101 of the forceps system, the water supply system, the air supply system, the objective imaging system, and the illumination optical system are attached and fixed.

Of these, the unit 101 of the objective imaging system is
A lens unit (including an illumination lens) 102, an optical unit (including a prism) 103, a CCD (solid-state image sensor) module 104, and the like are provided, and are attached to the head 100 via a frame 105 that is a supporting member. To be CCD module 104 has a signal line 1
It is electrically connected to the apparatus main body (not shown) via 06.

Next, as shown in FIGS. 13 (b) and 13 (c), a head 100 to which the unit 101 is fixed.
Then, a cap 107 made of an insulating material such as resin is covered.
As illustrated, nozzles (water supply and air supply) 108, a cover lens 109, and the like may be attached to the cap 107 in advance.

[0006]

The above-mentioned tip structure of the scope employs the metal head 100. The reason why it is made of metal is that the screws forming the main part of the fastening and fixing means of the unit 101 are usually small screws with a diameter of 1.4 mm or less, and when selecting the material of the head to which these small screws are fastened. , Because it was necessary to take into account the effects of tapping. For example, if a tap is made on a resin member, a so-called "screw fool" is likely to occur, which is not practical.

However, by using the metal head 100, the tip structure is complicated and the weight is increased, and the manufacturing time is lengthened. As a result, the entire apparatus is relatively expensive. Therefore, workability such as assembly and repair is not always efficient.

On the other hand, regarding the unit 101 of the objective image pickup system, the optical axis length is usually adjusted (focus adjustment) at the time of manufacturing (or at the time of disassembling and repairing), but the above-mentioned tip portion has workability at the time of the adjustment. The structure was not always conscious of. For example, at the time of adjustment, the lens unit 102 is screwed into the optical unit 103 previously fixed to the head 100 for adjustment, and the fixing position of the lens unit 102 is adjusted by a spacer or the like in order to manage the lens protrusion amount from the cap 107. Because it was necessary to intervene and adjust,
It was complicated and not always accurate.

Further, the above-mentioned tip structure is not necessarily designed in consideration of the mechanical strength of the connecting portion of the signal line 106, considering the influence of disturbances caused by the scope insertion, the angle operation and the like.

The present invention has been made in consideration of the above-mentioned problems of the prior art, and provides an endoscope apparatus which simplifies the structure of the distal end portion of a scope and constructs it at low cost, and improves workability such as assembly. The purpose is to do. Another object is to provide an endoscope apparatus that can improve workability when adjusting the optical axis of the objective imaging system.

[0011]

In order to achieve the above object, an endoscope apparatus according to a first aspect of the present invention has an endoscope and a head located at the tip of the endoscope and At least one of the tip placement parts of the air feeding system, the water feeding system, the forceps system, the illumination optical system, and the objective imaging system is attached to the tip end portion provided with the cap to cover the head, and at least the head is provided. At least a part of the tip placement component is attached to the head through an insertion hole formed of a resin member and drilled in the head.

In the invention according to claim 2, the cap is a resin member.

In the third aspect of the invention, the head and the cap are integrally formed of a resin member.

According to a fourth aspect of the invention, in the head,
A pilot hole having a diameter smaller than the outer diameter of a screw other than the tapping screw is drilled, and the screw is screwed into the pilot hole to fix the tip portion of the tip placement component to the insertion hole.

According to a fifth aspect of the present invention, the insertion hole has a diameter smaller than the outer diameter of the tip portion of the tip placement component, and the tip portion is press-fitted and fixed in the insertion hole.

According to the sixth aspect of the present invention, the tip end portion of the tip end placement component is pushed into the insertion hole by the snap fit method to be fixed.

According to a seventh aspect of the present invention, the insertion hole is a hole penetrating the head and the cap, and at least one of the air supply system and the water supply system has a tip end arrangement component extending from the tip end surface of the cap. A nozzle that fits into the hole is further provided, and a protrusion for preventing slipping out is provided in a part of the fitting portion of the nozzle.

According to an eighth aspect of the present invention, the external shape of the distal end portion of the distal end placement component is formed in a stepped shape, and the hole wall shape of the insertion hole to which the distal end portion is attached is adjusted to the external shape. It is formed in a stepped shape, and the mounting position of the tip portion along the axial direction of the insertion hole is determined by the both stepped shapes.

According to a ninth aspect of the present invention, the head is formed in a substantially columnar shape, and a projection is provided on a part of the formed outer peripheral surface, and the distal end portion of the endoscope has a substantially cylindrical shape that covers the head. The cover is provided with a locking groove capable of locking the protrusion, and the head and the cover are locked to each other.

According to the tenth aspect of the present invention, a concave portion having a size into which the tip of a tool can be inserted is provided on the surface around the insertion hole of the head.

In the eleventh aspect of the present invention, the distal end arrangement component of the objective image pickup system includes a lens barrel portion including at least an objective lens, and a solid-state image pickup device having an image pickup surface on which light rays from the lens barrel portion are incident. An adjusting mechanism for adjusting the optical axis length from the surface of the objective lens to the image pickup surface by sliding the solid-state image pickup element along the optical axis direction of the light beam with the lens barrel fixed to the insertion hole; Is equipped with.

According to a twelfth aspect of the present invention, the lens barrel portion is arranged substantially coaxially in the axial direction of the scope, and the solid-state image pickup device is arranged so that its image pickup surface is substantially parallel to the axial direction of the scope. The front end arrangement component of the objective image pickup system further includes a prism portion including at least a prism for changing the optical path of the light beam from the lens barrel portion toward the image pickup surface, and the adjustment mechanism includes the solid-state image pickup device and the prism portion. A mechanism for adjusting the optical axis length by sliding along the optical axis direction.

According to a thirteenth aspect of the present invention, the adjusting mechanism includes a fixing member fixed to the insertion hole together with the lens barrel portion, and a supporting member for slidably supporting the fixing member along the optical axis direction. And the solid-state imaging device and the prism portion are fixed to the support member.

In the fourteenth aspect of the present invention, the objective image pickup system further includes a signal line cable electrically connected to the solid-state image pickup device, and a part of the signal line cable is fixed to the support member. There is.

According to a fifteenth aspect of the present invention, the fixing member is made of metal or resin.

According to the sixteenth aspect of the present invention, there is provided an endoscope having an endoscope having a structure in which at least a distal end arranging component of an objective imaging system is mounted in a distal end portion of the endoscope. The arranging member includes a lens barrel including at least an objective lens, a solid-state image sensor having an imaging surface on which a light beam from the lens barrel is incident, and the solid-state image sensor with the lens barrel fixed in the distal end. Is adjusted along the optical axis direction of the light beam to adjust the optical axis length from the surface of the objective lens to the image pickup surface.

[0027]

In the endoscope apparatus according to the present invention, at least the head located at the tip of the endoscope is formed of a resin member, and at least the tip placement component is inserted through the insertion hole drilled in the head. Since a part of the head is attached to the head, the head made of metal in the past is lightened. Further, by forming the head with a resin member, it is possible to construct a tip end structure that does not cover the cap, for example, a structure in which the cap and the head are integrated, and use the characteristics of the resin such as elasticity and processability. The range of design choices for fixing means, etc. also expands.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.

The endoscope apparatus shown in FIG. 1 includes a scope 1 and
The apparatus main body 2 to which the scope 1 is connected is provided. The system main body 2 is integrally equipped with functional systems (light source optical system, control system, image processing system, etc.) not shown which are mounted in a normal endoscope apparatus, and required operations of the respective systems. In this way, the scope 1 is driven to acquire an endoscopic image, and the endoscopic image is displayed on the monitor Mt.

The scope 1 includes an insertion section 3 to be inserted into a body cavity, and an operation section 4 for an operator outside the body to operate when the insertion section 3 is operated in the body. It is connected to the apparatus main body 2 via the. Of these, the insertion portion 3 constitutes a leading end of the scope by extending from the operation portion 4 and a flexible main body portion 6, a bendable angle portion 7 extending from the main body portion 6, and the angle portion 7. The tip hard part 8 is provided.

As shown in FIG. 2, the tip hard portion 8 is a component (hereinafter, referred to as "head portion" and a cap portion (see FIG. 13) formed integrally with each other, which is made of a resin member having excellent water resistance. For the sake of convenience, the head 9 is tentatively referred to as a “cap-integrated head” 9 and a unit 10 that is attached to the cap-integrated head 9 and is a tip placement component. The tip end hard portion 8 is provided with the angle portion 7 via a cylindrical cover 11 that covers the outer peripheral portion of the head portion.
Is connected to the outer peripheral portion of the (see FIG. 11).

The cap-integrated head 9 has a cap portion and a head portion formed in a substantially columnar shape, and a plurality of units for mounting a unit are provided in the interior from the tip surface 9a of the cap portion to the base end surface 9b of the head portion. Insertion hole 12 ... 12
Is perforated. Further, a plurality of pilot holes 13, 13 for screw fastening are bored on the base end face 9b side. Further, a water supply nozzle 14 and an air supply nozzle 15 which form part of the unit 10 are attached to the tip surface 9a side (see FIG. 9).

The unit 10 is a main part that exhibits various endoscope functions equivalent to those of conventional ones at the most advanced scope, and more specifically, a tube-shaped (mainly made of an elastic body such as rubber or resin). (Or pipe-shaped) forceps hole 16, water supply hole 17, and air supply hole 18, an illumination optical system 19 for transmitting the illumination light from the device main body 2 to the specimen, and an internal portion that receives reflected light from the specimen. The objective imaging system 20 which produces | generates the electric signal for endoscope images is provided. Of these, the forceps hole 16, the water supply hole 17, and the air supply hole 18 are parts that are inserted into the scope 1, and are formed from a tube-shaped (or pipe-shaped) member mainly made of an elastic body such as rubber or resin. Has been formed.

The illumination optical system 19 includes two light guides 21 and 21 inserted into the scope 1 and a substantially cylindrical lens barrel 22 arranged at the tip ends of the light guides 21 and 21.
And an illumination lens 23 fixed inside. The lens surface of the illumination lens 23 is a cap-integrated head 9
In a state where the outside of the scope 1 is exposed from the tip surface 9a of the
Is integrally attached to the insertion hole 12 (see FIG. 8). Here, the illumination optical system 19 transmits the light supplied from the light source optical system (not shown) of the apparatus body 2 into the scope 1 to the illumination lens 23 in the lens barrel 22 via the light guides 21 and 21. It is supposed to do.

As shown in FIG. 3, the objective image pickup system 20 is a CCD module having an optical section 24 for receiving a light beam and a CCD 25 for converting the light beam from the optical section 24 into an electric signal for image. (Hereafter, "module part") 2
6 and a frame portion 27 as a supporting and fixing member for both elements 24, 26.

The optical section 24 includes an objective lens section 30 including at least an objective lens 29 fixed in a lens barrel 28 having a substantially cylindrical shape, and a light beam from the objective lens section 30 in a CCD 25.
And a prism portion (corresponding to a conventional "optical unit") 32 including at least a prism 31 for changing the optical path on the image pickup surface 25a. Of these, the objective lens 29 has a lens surface with the cap-integrated head 9
In a state in which the outside of the scope 1 is exposed from the tip surface 9a of the lens barrel 28,
Is integrally attached to the insertion hole 12 (see FIG. 8).

The module section 26 has an imaging surface 2 on one surface.
A CCD 25 having 5a is provided as a main part. The CCD 25 is arranged in the scope 1 with its imaging surface 25a being substantially parallel to the scope axis direction (hereinafter, "Z axis direction" shown in FIG. 3). Other configurations include
A circuit board on which the CCD 25 is mounted, a flexible printed circuit board, and various electronic circuits related to the CCD 25 (see FIG. 2).
And not specifically indicated in FIG. 3). The module section 26 is electrically connected to the apparatus main body 2 via a coaxial cable 33. Here, the video electric signal from the module unit 26 is sent to the apparatus main body 2 via the signal line of the coaxial cable 33 inserted into the scope 1 and is provided for an endoscopic image.

The frame portion 27 is a box-shaped fixing member (hereinafter, referred to as a “box”) 34 for accommodating the optical portion 24, and the box portion 34 is fixed to the cap-integrated head 9 so that the frame portion 27 is integrated with the module portion 26. A substantially L-shaped support member (hereinafter, “frame”) 35 that is slidable along the axial direction is provided.

The box 34 is made of, for example, a resin such as PPS (polyphenylene sulfide) having excellent water resistance, or a metal such as stainless steel having excellent anticorrosion properties and the like, and the objective lens portion is formed therein. It has opening spaces SP1 and SP2 that serve as an optical path space from 24 to the prism portion 32. Specifically, the front opening space SP1 near the cap-integrated head 1 along the substantially Z-axis direction is adapted to fit the base end side of the objective lens portion 24, and is substantially Y.
Lower opening space SP near the frame 35 along the axial direction
2 is adapted to slidably accommodate the prism portion 32. The size of the lower opening space SP2 is set in consideration of the required slide width of the frame 35.

A convex portion 36 for guiding the sliding movement of the frame 35 is arranged along the Z-axis direction on a part of the lower side surface of the box 34 which is substantially orthogonal to the Y-axis direction. Further, a screw mounting portion 37 is provided on one of both side surfaces of the box 35 substantially orthogonal to the X-axis direction, and mounting holes 38 into which screws 38, 38 are coupled are provided at two positions on both side surfaces thereof.
a and 38a are perforated.

The frame 35 has square holes 39 and 40 provided at two positions on the bottom surface of the CCD 25 near the image pickup surface 25a and substantially parallel to the Z-axis direction. One of the square holes 39 is set to have a hole size capable of fixing the exit side bottom portion of the prism portion 32, and a light ray from the prism portion 32 is picked up on the imaging surface 25a.
It is designed to be incident on. The other square hole 40 is set to a hole size that takes the required slide width into consideration,
With the convex portion 36 of the box 35 fitted, the slide movement of the frame 35 is guided by the slide width.

Further, on both side surfaces of the frame 35,
Slotted holes 41, 41 having a required slide width are provided. By connecting the screws 38, 38 to the mounting holes 38a, 38a of the box 34 via the elongated holes 41, 41, the frame 35 after slide adjustment is fixed to the box 34.

Further, on the base end side of the frame 35 (around the connection portion between the module portion 26 and the coaxial cable 33 or in the vicinity thereof), there is provided a cable fixing portion 42 having a clamping structure such as overtightening (see FIG. 4). It is arranged. By this cable fixing portion 39, a part of the coaxial cable 33 is fixed to the frame 34, and the mechanical strength of the coaxial cable 33 is enhanced against disturbance such as when the scope 1 is bent.
Note that the periphery of the connection portion or the vicinity thereof may be firmly wound with an adhesive tape or the like and fixed to the frame 35.

Here, a setting example regarding the fixed state of the cap-integrated head 9 and the unit 10 will be described with reference to FIGS.

First, in this embodiment, for the purpose of fixing the unit 10 to the cap-integrated head 9 which is a resin member, as shown in FIG. 5, a screw other than a tapping screw (normal screw etc.) SR is tapped. Instead, a means for screwing and fixing the self-tapping into the prepared hole 13 is adopted. The reason for this is that when the screw SR is used in a self-tapping manner, the resin is elastically deformed along the thread shape without substantially destroying the molecular bonding state inside the resin.

Therefore, in order to confirm the above points of interest, an experiment was conducted on the practicality of the screw SR (fastening strength, repeated durability, etc.). As a result, the outer diameter D of the screw SR (for example, D
= 1.4 mm), the diameter d of the prepared hole 13 is smaller than the outer diameter D by 1 to 2% (for example, d = 1.15 to 1.2).
It has been confirmed that the one having a diameter of about 5 mm) is the best mode. In addition, according to the result of this experiment, the prepared hole 13
Even when the screw SR was attached and detached several times (at least 3 to 5 times), the fastening strength that could be practically used was maintained.

Therefore, in this embodiment, as shown in FIG. 2, the screw SR and the pilot hole 13 are used as one of fixing means, and the forceps / suction hole 16 in the unit 10 and the tip portion of the objective imaging system 20 are used. Adopted in. Of course, it can be applied to the tip of the other unit 10.

Further, as a modified use of the above-mentioned fixing means, the tip portion of the unit 10 is cap-integrated head by the means utilizing the resin characteristics, for example, the method of press fitting shown in FIG. 6 or the method of snap fitting shown in FIG. You may fix in the insertion hole 12 of 9 in the state pushed in contrary to the internal resistance force.

For example, in the case of the press fitting method, the mounting hole 12
The diameter D2 is set smaller than the diameter D1 of the fitting portion of the unit 10. Further, in the case of the snap fit method, a protrusion (not shown) is provided on the inner wall of the mounting hole 12. In the present embodiment, these fixing means are adopted for the respective tip portions of the illumination optical system (light guide or the like) 19, the water supply hole 17 and the air supply hole 18 in the unit 10. Of course, it can be applied to the tip of the other unit 10.

According to the means utilizing the above resin characteristics, the tip end portion of the unit 10 pushed in against the resistance force is fixed in the insertion hole 12 by the elastic deformation of the resin. In addition,
Regarding the unit 10 which is generally called an endoscope tube such as the water supply hole 17 and the air supply hole 18, known means (for example, JP-A-5-7548) may also be used.

Next, an example of setting the fixed state on the tip surface 9a side will be described with reference to FIGS.

First, as shown in FIG. 8, the adjustment of the protrusion amount D of the lens (objective lens 29 and illumination lens 22) from the tip surface 9a will be considered. In this case, the outer shape of the tip portion of the unit 10 is a stepped shape Sh having different diameters, and the insertion hole 12 of the cap-integrated head 9 is matched with this shape Sh.
The hole wall shape is also made into a stepped shape Sh by resin processing. The protrusion amount D is determined by the mechanical processing accuracy and the molding accuracy of the double-stepped shapes Sh, Sh. The other unit 10 (water supply hole 17, air supply hole 18) can also be applied to the pipe-shaped tip portion.

Next, as shown in FIG. 9, consideration will be given to preventing the nozzle (water supply nozzle 14 or air supply nozzle 15) from coming off. In this case, a wedge-shaped or anchor-shaped protrusion Tk for preventing slippage is provided in a part of the fitting portion of the nozzle. The protrusion Tk is hard to fit into the resin member, so that the nozzle is prevented from coming off.

Next, an application example utilizing the resin characteristics of the cap-integrated head 9 will be described with reference to FIGS.

First, as shown in FIG. 10, a recess 43 having a size into which the tip of a tool can be inserted is provided on the surface around the insertion hole 12 of the cap-integrated head 9 as a center. With this recess 43, repair work such as removal while carrying tools against a fixed object can be easily performed, and the repair time can be shortened.

Further, as shown in FIG. 11, a substantially circular projection 44 for locking is provided at the connecting portion with the cover 11 on the outer peripheral portion of the cap-integrated head 9, and the cover 1 is provided.
1 is provided with a substantially L-shaped locking groove 45 capable of locking the above protrusion. As a result, the cap-integrated head 9 and the cover 11
And are locked together. The protrusion 44 and the locking groove 45
Has the shape shown in FIG. 11 (substantially circular and L-shaped)
However, the shapes are not limited to the above, and any shapes that can engage with each other may be used.

As described above, in the present embodiment, the cap-integrated head is made of a resin having excellent workability, and the unit is fixed by the fixing means that maximizes the resin characteristics. Since it is not used, the weight of the tip can be reduced, and a simplified tip structure can be constructed at low cost.

As a result, the number of parts and the number of processing steps are reduced, and work efficiency is greatly improved. Also, since it becomes relatively easy to replace the attached parts during repair, the repair time and cost can be improved, the reliability of the device is increased, and the burden on the user is greatly reduced. Further, it is possible to reduce the diameter of the endoscope by the thickness of the conventional cap-integrated head.

Although the cap-integrated head is arranged in the above embodiment, the present invention is not necessarily limited to the cap-integrated head, and at least the conventional head is made of resin. Good.

Next, the operation in the optical axis length adjustment state will be described with reference to FIG. 12 centering on the setting example of the objective image pickup system 20.

First, the objective lens section 30 is fitted into the cap-integrated head 9. Here, the objective lens unit 30
The stepped shape Sh of each of the lens barrel 28 and the insertion hole 12 of the cap-integrated head 9 determines the protrusion amount D of the lens surface from the tip surface 9a to the outside (see FIG. 8).

Then, by screwing the screw SR into the prepared hole 13, the box 38 is fixed to the cap-integrated head 9 through the insertion hole 12. At this time, Box 3
The base end side of the objective lens unit 30 is fixed in the front opening space SP1 of 8 and the lower opening space SP2 thereof.
The prism portion 32 fixed in advance in the square hole 39 of the frame 35 is housed therein.

Next, the objective lens section 30 and the prism section 3
The optical axis length is adjusted by changing the distance L between the two. In this adjustment, when the frame 42 is slid along the convex portion 36 of the box 34 while confirming the position with an XY stage or the like, the prism portion 32 is also slid along with this, and the distance L is changed (FIG. 12 out of
See arrow a, distances L1 and L2). As a result, the optical axis length is finely adjusted according to the predetermined focus, and after the adjustment, the frame 35 and the box 34 are fixed by the screw 38 being coupled.

As described above, since it is unnecessary to adjust the projection amount of the objective lens, and the optical axis length can be easily and accurately adjusted only by the sliding operation, the complicated work of inserting the conventional spacers and the like can be performed. It becomes unnecessary and work efficiency will be greatly improved.

[0065]

As described above, in the endoscope apparatus according to the present invention, it is located at the tip of the endoscope.
At least the head is formed of a resin member, and at least a part of the tip end placement component is attached to the head through an insertion hole drilled in the head, so that the head that is conventionally made of metal is reduced in weight. The burden is also reduced. Also, by forming the head with a resin member,
A simple tip structure that does not cover the cap, for example, a structure in which the cap and the head are integrated can be constructed at low cost, and the design selection range of the fixing means etc. that uses the characteristics of the resin such as elasticity and processability is also available. As a result, the workability of assembling will be greatly improved.

As for the objective image pickup system of the tip-arranged parts, since the mechanism for adjusting the optical axis length while sliding along the optical axis is provided, the focus can be adjusted easily and accurately. Workability is greatly improved.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing the overall configuration of an endoscope apparatus according to an embodiment.

FIG. 2 is a schematic perspective view showing a configuration of a main part of a tip portion.

FIG. 3 is a schematic perspective view showing a main configuration of an objective imaging system.

FIG. 4 is a schematic perspective view illustrating fixing of a cable by a clamp structure.

FIG. 5 is a schematic cross-sectional view illustrating a setting example of fastening means using screws.

FIG. 6 is a schematic cross-sectional view illustrating a fixing means by press fitting.

FIG. 7 is a schematic cross-sectional view illustrating a fixing means by snap fitting.

FIG. 8 is a schematic cross-sectional view illustrating adjustment of the protrusion amount of a lens.

FIG. 9 is a schematic cross-sectional view illustrating retaining of a nozzle.

FIG. 10 is a schematic cross-sectional view illustrating a recess for tools.

FIG. 11 is a schematic cross-sectional view illustrating a mutual locking portion of the cap-integrated head and the cover.

FIG. 12 is a schematic sectional view illustrating adjustment of the optical axis length of the objective imaging system.

FIG. 13 is a schematic perspective view for explaining a conventional tip structure, (a) is an explanatory view at the time of assembling the head and the unit,
(B) is an explanatory view when the head and the cap-integrated head are assembled, and (c) is an explanatory view when the assembly is completed.

[Explanation of symbols]

 1 Endoscope 2 Device main body 3 Insertion part 4 Operation part 5 Universal cord 6 Main body part 7 Angle part 8 Tip hard part 9 Cap integrated head 10 Unit (tip placement part) 11 Cover 12 Insertion hole 13 Prepared hole SR screw ( 16) Forceps hole 17 Water supply hole 18 Air supply hole 19 Illumination optical system 10 Objective imaging system

Claims (16)

[Claims] 1. An air-sending system, a water-sending system, a forceps system, an illumination optical system, which has a head located at a distal end of the endoscope and a cap which covers the head, the endoscope having an endoscope. In an endoscope apparatus to which at least one of the tip placement components of the objective imaging system is attached, at least the head is formed of a resin member, and at least the tip placement component is formed through an insertion hole formed in the head. An endoscopic device having a part thereof attached to the head. 2. The cap is a resin member.
The endoscopic device described. 3. The endoscope apparatus according to claim 1, wherein the head and the cap are integrally formed of a resin member. 4. The head is provided with a prepared hole having a diameter smaller than the outer diameter of a screw other than the tapping screw, and the screw is screwed into the prepared hole, whereby the distal end portion of the distal end placement component is inserted into the insertion hole. The endoscope apparatus according to claim 3, which is fixed. 5. The endoscope apparatus according to claim 3, wherein the insertion hole has a diameter smaller than an outer diameter of a tip portion of the tip placement component, and the tip portion is press-fitted and fixed in the insertion hole. 6. The endoscope apparatus according to claim 3, wherein the distal end portion of the distal end placement component is pushed into and fixed to the insertion hole by a snap fit method. 7. The insertion hole is a hole that penetrates through the head and the cap, and at least one of the air supply system and the water supply system has a tip end component that is fitted from the tip end surface of the cap toward the hole. The endoscope apparatus according to claim 3, further comprising a nozzle, wherein a projection for preventing the slip-out is provided in a part of a fitting portion of the nozzle. 8. The outer shape of the tip portion of the tip placement component is formed in a stepped shape, and the hole wall shape of the insertion hole to which the tip portion is attached is formed in a stepped shape in accordance with the outer shape. The endoscope apparatus according to claim 3, wherein the mounting position of the distal end portion along the axial direction of the insertion hole is determined by the stepped shape. 9. The head is formed in a substantially cylindrical shape, a protrusion is provided on a part of the formed outer peripheral surface, and the distal end portion of the endoscope is further provided with a substantially cylindrical cover that covers the head. The endoscope apparatus according to claim 3, wherein the cover is provided with a locking groove capable of locking the projection, and the head and the cover are locked to each other. 10. The endoscope apparatus according to claim 3, wherein a concave portion having a size into which a tip of a tool can be inserted is provided on a surface around the insertion hole of the head. 11. A distal end component of the objective imaging system includes a lens barrel portion including at least an objective lens, a solid-state image sensor having an image pickup surface on which a light beam from the lens barrel portion is incident, and the lens barrel portion. The adjustment mechanism for adjusting the optical axis length from the surface of the objective lens to the image pickup surface by sliding the solid-state image pickup element along the optical axis direction of the light beam while being fixed in the insertion hole. The endoscopic device described. 12. The lens barrel section is arranged substantially coaxially in the axial direction of the scope, the solid-state image pickup element is arranged so that its image pickup surface is substantially parallel to the axial direction of the scope, and the tip of the objective image pickup system is arranged. The component further includes a prism portion including at least a prism that changes the optical path of the light beam from the lens barrel portion toward the imaging surface, and the adjustment mechanism includes the solid-state imaging device and the prism portion along the optical axis direction of the light beam. The endoscope apparatus according to claim 11, which is a mechanism that slides to adjust the optical axis length. 13. The adjusting mechanism includes a fixing member fixed to the insertion hole together with the lens barrel portion, and a supporting member slidably supporting the fixing member along the optical axis direction. The endoscope apparatus according to claim 12, wherein the solid-state imaging device and the prism portion are fixed to a member. 14. The internal view according to claim 13, wherein the objective image pickup system further includes a signal line cable electrically connected to the solid-state image pickup element, and a part of the signal line cable is fixed to the support member. Mirror device. 15. The endoscope apparatus according to claim 11, wherein the fixing member is made of metal or resin. 16. An endoscope apparatus having an endoscope and having at least a distal end placement component of an objective imaging system mounted in a distal end portion of the endoscope scope, wherein the distal end placement member includes at least an objective lens. A lens barrel portion, and a solid-state image sensor having an image pickup surface on which light rays from the lens barrel portion are incident,
An adjusting mechanism for adjusting the optical axis length from the surface of the objective lens to the image pickup surface by sliding the solid-state image pickup element along the optical axis direction of the light beam in a state where the lens barrel section is fixed in the tip section. An endoscopic device comprising: