CN113243882A

CN113243882A - Endoscope and method for disassembling endoscope

Info

Publication number: CN113243882A
Application number: CN202110181204.XA
Authority: CN
Inventors: 内藤圭介
Original assignee: Fujifilm Corp
Current assignee: Fujifilm Corp
Priority date: 2020-02-13
Filing date: 2021-02-09
Publication date: 2021-08-13
Also published as: JP7216034B2; JP2021126286A

Abstract

The invention provides an endoscope and a method for disassembling the endoscope, which can prevent damage of a lens and focus offset when an endoscope camera head is detached from an endoscope front end part main body. The endoscope is provided with: an endoscope camera having a lens barrel that holds a lens, an imaging element, an optical component that is disposed between the lens barrel and the imaging element and guides light that has passed through the lens to the imaging element, and an optical component holder that holds the lens barrel and the optical component; and an endoscope distal end portion body having a through portion into which the endoscope camera is inserted, an outer peripheral surface of the lens barrel being bonded and fixed to an inner surface of the optical component holder, the endoscope camera being bonded and fixed to the endoscope distal end portion body, the optical component holder having a protruding portion protruding outward from the outer peripheral surface of the lens barrel in a radial direction of the lens barrel, the endoscope distal end portion body having an opening portion at a position overlapping the protruding portion of the optical component holder when viewed in an axial direction of the lens barrel.

Description

Endoscope and method for disassembling endoscope

Technical Field

The present invention relates to an endoscope and a method of disassembling the endoscope.

Background

In an endoscope, an endoscope camera having a lens barrel holding a lens, an imaging element, and the like is provided at a distal end portion of the endoscope inserted into a subject.

For example, patent document 1 describes an endoscope in which an objective lens and an imaging element positioned on an imaging surface of the objective lens are provided at a distal end of an insertion portion in a body of the endoscope, and a prism for bending light from the objective lens toward the imaging element is provided.

In an endoscope camera head having a lens barrel, an imaging element, and the like, the lens barrel holding a lens is bonded so as to adjust a relative position in an axial direction for forming an image of light on a light receiving surface of the imaging element. Therefore, when a structure having a prism (optical member) between a lens barrel (lens) and a solid imaging element, the relative position of the lens barrel and the prism is fixed using an optical member holder that holds the lens barrel and the prism.

Patent document 1: japanese laid-open patent publication No. 9-187420

However, an endoscope camera having an imaging element or the like is expensive. Therefore, it is desirable to detach the endoscope camera from the endoscope and reuse the endoscope camera.

However, the endoscope camera is adhesively fixed to the endoscope distal end portion main body, and when the endoscope camera is detached from the endoscope distal end portion main body, if the surface of the lens held by the lens barrel is pressed, a load is applied to the lens surface, and therefore, there arises a problem that the lens is damaged or broken. Further, since a load is applied to a portion where the lens barrel and the optical component holder are fixedly bonded to each other at the time of detachment, there is a problem that the relative position between the lens barrel and the prism is shifted and the focus is shifted. Therefore, there is a problem that the detached endoscope camera cannot be reused or that the focus needs to be readjusted.

Disclosure of Invention

The present invention has been made to solve the above-described problems of the conventional art, and an object of the present invention is to provide an endoscope and a method of disassembling the endoscope, which can prevent damage to a lens and prevent a focus shift when detaching an endoscope camera from an endoscope distal end portion body.

In order to solve the above problems, the present invention has the following structure.

[1] An endoscope, comprising: an endoscope camera having a lens, a lens barrel holding the lens, an imaging element, an optical component disposed between the lens barrel and the imaging element and guiding light having passed through the lens to the imaging element, and an optical component holder holding the lens barrel and the optical component; and

an endoscope front end body having a through part into which an endoscope camera is inserted,

the lens barrel is embedded in the optical component holder, the outer peripheral surface of the lens barrel and the inner surface of the optical component holder are fixedly bonded through a first bonding and fixing part 1,

the endoscope camera and the endoscope front end part main body are adhered and fixed through a 2 nd adhesion fixing part,

the optical component holder has a protruding portion protruding further to the outside than the outer peripheral surface of the lens barrel in the radial direction of the lens barrel,

the endoscope distal end portion main body has an opening portion that penetrates in the axial direction from the distal end surface of the endoscope distal end portion main body at a position where at least a part overlaps the protruding portion of the optical component holder when viewed in the axial direction of the lens barrel,

the opening has a size that can be inscribed in a circle having a diameter of 0.1mm or more.

[2] The endoscope according to [1], wherein the opening portion is hermetically sealed by a hermetic member.

[3] The endoscope according to [2], wherein the airtight member is a sealing member.

[4] The endoscope according to [2] or [3], wherein a joint surface or a gap is provided between the airtight member and the 2 nd adhesion fixing portion.

[5] The endoscope according to any one of [1] to [4], wherein the 2 nd adhesion fixation portion is located closer to the proximal end side than the 1 st adhesion fixation portion.

[6] An endoscope, comprising: an endoscope camera having a lens, a lens barrel holding the lens, an imaging element, an optical member disposed between the lens barrel and the imaging element and guiding light having passed through the lens to the imaging element, an optical member holder holding the lens barrel and the optical member, and an outer cylinder member into which the optical member holder is inserted; and

the lens barrel is embedded in the optical component holder, the outer peripheral surface of the lens barrel is fixedly adhered with the inner surface of the optical component holder,

the outer peripheral surface of the optical component holder is bonded and fixed to the outer cylinder member,

the outer tube member is bonded and fixed to the endoscope distal end portion main body.

[7] The endoscope according to item [6], which has an airtight member for airtight sealing between the lens barrel and the outer cylinder member.

[8] The endoscope according to [7], wherein the airtight member is a sealing member.

[9] The endoscope according to any one of [6] to [8], wherein an outer diameter of the outer cylinder member is larger than an outer diameter of the lens barrel by 0.2mm or more.

[10] The endoscope according to any one of [6] to [9], wherein the optical member holder includes an outer tube member positioning portion that is positioned by being brought into contact with the outer tube member.

[11] The endoscope according to any one of [6] to [10], wherein the outer tube member has an endoscope distal end portion main body positioning portion that is positioned in contact with the endoscope distal end portion main body.

[12] A method of detaching an endoscope camera from an endoscope distal end portion main body having a through portion into which the endoscope camera is inserted, the method comprising detaching the endoscope camera from the endoscope distal end portion main body, the endoscope camera having a lens, a lens barrel holding the lens, an imaging element, an optical member disposed between the lens barrel and the imaging element and guiding light having passed through the lens to the imaging element, and an optical member holder holding the lens barrel and the optical member,

the endoscope distal end portion main body has an opening portion penetrating from at least a distal end surface of the endoscope distal end portion main body to a position of the protruding portion at a position at least partially overlapping the protruding portion of the optical component holder when viewed in an axial direction of the lens barrel,

the pressing member is inserted from the opening of the endoscope distal end portion body to press the protruding portion of the optical component holder, thereby detaching the endoscope camera from the endoscope distal end portion body.

[13] A method of detaching an endoscope camera from an endoscope distal end portion body having a through portion into which the endoscope camera is inserted, the method comprising detaching the endoscope camera from the endoscope distal end portion body, the endoscope camera having a lens, a lens barrel holding the lens, an imaging element, an optical member disposed between the lens barrel and the imaging element and guiding light having passed through the lens to the imaging element, an optical member holder holding the lens barrel and the optical member, and an outer tube member into which the optical member holder is inserted,

the endoscope camera is detached from the endoscope distal end portion body by pressing the outer tube member from the distal end side using the pressing member.

Effects of the invention

According to the present invention, it is possible to provide an endoscope and a method of disassembling the endoscope, which can prevent damage to a lens and prevent a focus shift when detaching an endoscope camera from an endoscope distal end portion body.

Drawings

Fig. 1 is a schematic configuration diagram showing an example of a configuration of an endoscope system using an endoscope according to the present invention.

Fig. 2 is a perspective view schematically showing an example of an endoscope camera provided in an endoscope according to embodiment 1 of the present invention.

Fig. 3 is a perspective view schematically showing an example of the distal end portion of the endoscope including the endoscope camera shown in fig. 2.

Fig. 4 is an axial cross-sectional view of fig. 3.

Fig. 5 is a perspective view schematically showing another example of the endoscope camera.

Fig. 6 is a perspective view schematically showing another example of the endoscope camera.

Fig. 7 is a perspective view schematically showing another example of the distal end portion of the endoscope.

Fig. 8 is an axial cross-sectional view of fig. 7.

Fig. 9 is a perspective view schematically showing another example of the distal end portion of the endoscope.

Fig. 10 is an axial cross-sectional view of fig. 9.

Fig. 11 is a sectional view schematically showing another example of the distal end portion of the endoscope.

Fig. 12 is a perspective view schematically showing an example of an endoscope camera provided in the endoscope of embodiment 2.

Fig. 13 is a perspective view schematically showing another example of the distal end portion of the endoscope.

Fig. 14 is an axial cross-sectional view of fig. 13.

Fig. 15 is a sectional view schematically showing another example of the distal end portion of the endoscope.

Fig. 16 is a perspective view schematically showing another example of the endoscope camera.

Fig. 17 is a perspective view schematically showing another example of the endoscope camera.

Fig. 18 is a perspective view schematically showing another example of the endoscope camera.

Fig. 19 is a sectional view schematically showing another example of the distal end portion of the endoscope.

Fig. 20 is a sectional view schematically showing another example of the distal end portion of the endoscope.

Detailed Description

Hereinafter, an endoscope and an endoscope disassembling method according to embodiments of the present invention will be described with reference to the drawings.

The following description of the constituent elements is made in accordance with exemplary embodiments of the present invention, but the present invention is not limited to such embodiments. In the drawings of the present specification, the scale of each portion is shown with appropriate changes for the sake of visual recognition.

In the present specification, a numerical range represented by "to" means a range in which numerical values described before and after "to" are included as a lower limit value and an upper limit value.

[ embodiment 1]

An endoscope according to embodiment 1 of the present invention includes:

an endoscope camera having a lens, a lens barrel holding the lens, an imaging element, an optical component disposed between the lens barrel and the imaging element and guiding light having passed through the lens to the imaging element, and an optical component holder holding the lens barrel and the optical component; and

Further, in an endoscope according to embodiment 1 of the present invention, an endoscope disassembling method is a method of disassembling an endoscope camera head having a lens, a lens barrel holding the lens, an imaging element, an optical member arranged between the lens barrel and the imaging element and guiding light having passed through the lens to the imaging element, and an optical member holder holding the lens barrel and the optical member from an endoscope distal end portion body having a through portion into which the endoscope camera head is inserted,

Fig. 1 conceptually shows an example of an endoscope system including an endoscope of the present invention.

The endoscope system 1 includes an endoscope 2, a light source unit 3, and a processor unit 4. The endoscope 2 has the same structure as a conventional endoscope except for a portion of an endoscope distal end portion (hereinafter, also referred to as a distal end portion) described later.

The endoscope 2 includes an insertion portion to be inserted into a subject, an operation portion connected to the insertion portion, and a universal cord extending from the operation portion, and the insertion portion includes a distal end portion, a bending portion connected to the distal end portion, and a flexible portion connecting the bending portion and the operation portion.

The distal end portion is provided with an illumination optical system that emits illumination light for illuminating an observation site, an imaging device that images the observation site, an imaging optical system, and the like. The bending portion is configured to be bendable in a direction orthogonal to a longitudinal axis of the insertion portion, and a bending operation of the bending portion is operated by the operation portion. The flexible portion is configured to be relatively flexible to the extent that it can be deformed in conformity with the shape of the insertion path of the insertion portion.

The operation portion is provided with a button for operating the image pickup operation of the image pickup device at the distal end portion, a handle for operating the bending operation of the bending portion, and the like. An introduction port through which a treatment instrument such as an electric scalpel is introduced is provided in the operation portion, and a treatment instrument channel through which a treatment instrument such as a forceps is inserted is provided in the insertion portion from the introduction port to the distal end portion.

A connector is provided at the distal end of the universal cord, and the endoscope 2 is connected via the connector to a light source unit 3 that generates illumination light emitted from an illumination optical system at the distal end portion and a processor unit 4 that processes a video signal acquired by an imaging device at the distal end portion.

The processor unit 4 processes the input video signal to generate video data of the observation site, displays the generated video data on a display, and records the video data. The processor unit 4 may be a processor such as a PC (personal computer).

The light source unit 3 generates illumination light such as white light composed of three primary color light such as red light (R), green light (G), and blue light (B) or illumination light such as light of a specific wavelength, and supplies the illumination light to the endoscope 2, propagates through a light guide or the like in the endoscope 2, and is emitted from an illumination optical system at the distal end portion of the insertion portion of the endoscope 2 to illuminate the observation target site in the body cavity, in order to capture an image signal by imaging the observation target site in the body cavity by the imaging device of the endoscope 2.

The optical waveguide and the electric wire group (signal cable) are accommodated in the insertion portion, the operation portion, and the universal cord. The illumination light generated by the light source unit 3 is guided to the illumination optical system of the tip portion via the light guide, and a signal and/or electric power is transmitted between the image pickup device of the tip portion and the processor unit 4 via the electric wire group.

The endoscope system 1 may further include a water supply tank for storing cleaning water or the like, and a suction pump for sucking a suction material in the body cavity (including the supplied cleaning water or the like). Further, a supply pump or the like may be provided to supply gas such as cleaning water or outside air in the water supply tank to a pipe line (not shown) in the endoscope.

Fig. 2 is a perspective view schematically showing an example of an endoscope camera provided in an endoscope according to embodiment 1 of the present invention. Fig. 3 is a perspective view schematically showing an example of the distal end portion of the endoscope including the endoscope camera shown in fig. 2. Fig. 4 shows an axial section through fig. 3. The axial sectional view is a sectional view perpendicular to the light receiving surface of the imaging element in a direction parallel to the optical axis of the lens.

First, the configuration of the endoscope camera will be described with reference to fig. 2.

An endoscope camera (hereinafter, also referred to as a camera) 10a shown in fig. 2 includes a lens 12, a lens barrel 14 that holds the lens 12, an imaging element (hereinafter, also referred to as a sensor) 16, a cover glass 17, an optical member (hereinafter, also referred to as a prism) 18, an optical member holder 20, a circuit board 22, and a protective member 24.

The lens 12 is an optical system that images incident light on a light receiving surface of the sensor 16. The lens 12 is held by a lens barrel 14. In the illustrated example, the camera 10a has 3 lenses 12.

The lens barrel 14 is a cylindrical member and holds 1 or more lenses 12. The lens barrel 14 holds the lens 12 such that an optical axis of the lens 12 is perpendicular to one surface of the prism 18.

The structure of the lens 12 and the lens barrel 14 is not particularly limited. For example, the configuration may be such that 1 lens 12 is provided, or 2 or 4 or more lenses 12 are provided. Each lens 12 may be a convex lens or a concave lens.

The sensor 16 is an imaging element that converts light imaged by the lens 12 into an electric signal by photoelectric conversion to perform imaging. The sensor 16 is a conventionally known imaging Device such as a CCD (Charge-Coupled Device) or a CMOS (Complementary MOS).

The sensor 16 is disposed on the proximal end side of the lens barrel 14. As shown in fig. 2 and 4, the sensor 16 is mounted on the circuit board 22 such that the light receiving surface is parallel to the optical axis of the lens 12.

Electronic components other than the sensor 16 may be mounted on the circuit board 22. The circuit board 22 is provided with a plurality of connection terminals (not shown) for inputting and outputting signals or electric power to and from the sensor 16 and the electronic components. The signal lines of the cable 26 are electrically connected to the connection terminals.

The circuit board 22 may be a flexible board. The circuit board 22 may be bent at 2 or more portions. The arrangement of the sensor 16, the electronic components, the connection terminals, and the like on the circuit board 22 is not particularly limited.

The cover glass 17 is disposed on the light receiving surface of the sensor 16 and protects the light receiving surface. A prism 18 is disposed on the cover glass 17.

The prism 18 is disposed between the lens barrel 14 and the sensor 16. The prism 18 bends the light that has passed through the lens 12 held by the barrel 14 by 90 °, changes the optical path, and guides the light to the light receiving surface of the sensor 16. In the illustrated example, the prism 18 is a rectangular prism having an incident surface orthogonal to an exit surface. The prism 18 is disposed such that an incident surface faces the base end side surface of the barrel 14 and an emission surface faces the light receiving surface of the sensor 16.

The optical component holder 20 is a member that holds the lens barrel 14 and the prism 18. The optical component holder 20 is a substantially cylindrical member, and the lens barrel 14 is inserted into the cylindrical portion to hold the lens barrel 14. The inner surface of the optical component holder 20 and the outer peripheral surface of the lens barrel 14 are adhesively fixed by a 1 st adhesive fixing portion (not shown).

As the adhesive for bonding the optical component holder 20 and the lens barrel 14, various known adhesives used in conventional endoscopes can be used. The same applies to the adhesive for bonding other members to each other.

The optical component holder 20 has a polygonal flange portion on the end surface of the cylindrical portion on the base end side, and abuts against the incident surface of the prism 18. Thereby, the prism 18 is positioned. The optical component holder 20 holds the lens barrel 14 and the prism 18 at predetermined positions, thereby fixing the relative position between the lens barrel 14 and the prism 18, that is, the relative position between the lens barrel 14 and the sensor 16 (light receiving surface).

Here, the lens barrel 14 is adhesively fixed to the optical component holder 20 so as to adjust the relative position of the lens 12 in the optical axis direction (hereinafter, also referred to as the axial direction) with respect to the optical component holder 20 to the light receiving surface of the in-focus sensor 16.

Here, the optical component holder 20 has a protruding portion 20a that protrudes outward from the outer peripheral surface of the lens barrel 14 in the radial direction of the lens barrel 14. In the endoscope of the present invention, the camera head 10a can be easily detached from the endoscope distal end portion body by pressing the protrusion portion 20 a. This point will be described in detail later.

In the example shown in fig. 2, the optical component holder 20 has a protruding portion 20a on the end surface on the distal end side of the cylindrical portion. The protruding portion 20a is formed to protrude radially at a part in the circumferential direction of the optical component holder 20. The protruding portion 20a has a substantially semicircular shape.

The protective member 24 is a member that holds the cable 26 with respect to the optical component holder 20.

As shown in fig. 2, the protective member 24 is a member formed by bending 1 plate member, and has a pair of arm portions on the tip end side. The arm portion is locked to a flange portion on the base end side of the optical component holder 20. The protective member 24 is caulked at the proximal end so as to press the cable 26. The protective member 24 prevents the connection between the connection terminal and the signal line from being broken due to the connection site between the connection terminal and the signal line on the circuit board 22 being pulled when the cable 26 is pulled.

A cable 26 is connected to the camera 10 a. The light is converted by the sensor 16 into an electrical signal, which is sent via the cable 26. The cable 26 is inserted through an insertion portion, an operation portion, a universal cord, and the like of the endoscope and connected to the processor unit 4.

As a result, the observation image read by the camera 10a is imaged on the light receiving surface of the sensor 16 and converted into an electric signal, the electric signal is output to the processor unit 4 via the cable 26 and converted into a video signal, and the observation image is displayed on a display connected to the processor unit 4.

Next, an endoscope distal end portion 40a having the camera head 10a shown in fig. 2 will be described with reference to fig. 3 and 4.

The endoscope distal end portion 40a shown in fig. 3 and 4 includes a camera 10a and an endoscope distal end portion main body 30.

The endoscope distal end portion body 30 is a member formed of a hard member constituting the endoscope distal end portion. A through portion 32 into which the camera 10a is inserted is formed in the distal end surface 31 of the endoscope distal end portion body 30. The endoscope distal end portion body 30 is provided with an illumination hole, a jaw opening, an air supply/water supply nozzle hole, and the like. A distal end cap (a resin member for protecting and insulating the distal end) or the like may be provided at the distal end portion of the endoscope.

As shown in fig. 3 and 4, the camera 10a is inserted into the through portion 32 of the endoscope distal end portion body 30, and is fixed by the second adhesive fixing portion 2 (not shown).

Here, the endoscope distal end portion main body 30 has an opening 33a penetrating in the axial direction from the distal end surface 31 of the endoscope distal end portion main body 30 at a position at least partially overlapping the protruding portion 20a of the optical component holder 20 when viewed in the axial direction.

In the illustrated example, the opening 33a is formed in a substantially semicircular shape similar to the protruding portion 20a so as to be connected to (communicate with) a part of the edge of the through portion 32.

When the camera 10a is inserted into the through portion 32 of the endoscope distal end portion body 30, the protruding portion 20a of the optical component holder 20 is inserted into the opening 33 a. In other words, the opening 33a is formed at a position overlapping the protrusion 20a when viewed from the axial direction.

The opening 33a has a size that can be inscribed in a circle having a diameter of 0.1mm or more. The size of the opening 33a here means the size obtained when the through portion 32 is removed even when the opening 33a communicates with the through portion 32. In other words, the size of the opening 33a is the size in the state where the camera 10a is inserted into the through portion 32.

In this type of endoscope, in the disassembling method of the endoscope in which the camera head 10a is detached from the endoscope distal end portion main body 30, as shown by an arrow in fig. 4, a pressing member such as a pin is inserted from the opening 33a and the protruding portion 20a is pressed toward the proximal end side, whereby the 2 nd adhesively fixing portion of the optical component holder 20 and the endoscope distal end portion main body 30 is peeled off and adhesively fixed. This enables the camera 10a to be detached from the endoscope distal end portion main body 30.

As described above, since a camera having a sensor and the like is expensive, it is desired to detach the camera from the endoscope and reuse the camera. However, the camera head is adhesively fixed to the endoscope distal end portion main body, and when the camera head is detached from the endoscope distal end portion main body, if the surface of the lens held by the lens barrel is pressed, a load is applied to the surface of the lens, and therefore, there arises a problem that the lens is damaged or broken. Further, since a load is applied to a portion where the lens barrel and the optical component holder are fixedly bonded to each other at the time of detachment, there is a problem that the relative position between the lens barrel and the prism is shifted and the focus is shifted. Therefore, there is a problem that the detached camera cannot be reused or that the focus needs to be readjusted.

In contrast, in the endoscope of the present invention, the optical component holder 20 includes a protrusion 20a that protrudes outward beyond the outer peripheral surface of the lens barrel 14 in the radial direction of the lens barrel 14, and the endoscope distal end portion body 30 has an opening 33a having a size that can be inscribed in a circle having a diameter of 0.1mm or more that penetrates in the axial direction from the distal end surface 31 of the endoscope distal end portion body 30 at a position overlapping the protrusion 20a when viewed in the axial direction. Thus, as shown by the arrow in fig. 4, the projecting portion 20a is pressed by inserting a pressing member such as a pin through the opening 33a, and the 2 nd adhesive fixing portion adhesively fixing the optical component holder 20 and the endoscope distal end portion body 30 is peeled off, whereby the camera head can be detached. At this time, since a pressing force is not applied to the 1 st adhesively-fixing portion that adhesively fixes the lens barrel 14 and the optical component holder 20, it is possible to prevent the relative position between the lens barrel 14 and the optical component holder 20, that is, the relative position between the lens barrel 14 and the prism 18 from being shifted. Therefore, the focus shift can be prevented. Further, since the surface of the lens 12 is not pressed, damage to the lens can be prevented. Therefore, the detached camera can be reused, and when the camera is reused, it is not necessary to readjust the focus or the like, so that the camera can be easily reused.

The opening 33a has a size that can be inscribed in a circle having a diameter of 0.1mm or more. Therefore, as the pressing member when detaching the camera, a pin having a diameter of at least 0.1mm can be used. If the diameter of the pressing member is less than 0.1mm, there is a possibility that the pressing member may be bent due to insufficient strength of the pressing member during pressing. On the other hand, since the opening 33 has a size that can be inscribed in a circle having a diameter of 0.1mm or more, a pin having a diameter of at least 0.1mm can be used as the pressing member. Therefore, it is possible to prevent a problem such as bending due to insufficient strength of the pressing member during pressing.

Here, the 2 nd adhesively fixing portion that adhesively fixes the camera head 10a and the endoscope distal end portion body 30 is preferably located on the proximal end side of the 1 st adhesively fixing portion that adhesively fixes the lens barrel 14 and the optical component holder 20.

Accordingly, it is preferable that the 2 nd adhesive fixing portion is located closer to the base end side than the 1 st adhesive fixing portion, and a force when the projecting portion of the optical component holder is pressed is applied only to the 2 nd adhesive fixing portion without being applied to the 1 st adhesive fixing portion, so that the 1 st adhesive fixing portion is less likely to be broken.

The 2 nd adhesion-fixation section is not limited to the structure in which the optical component holder 20 of the camera 10a and the endoscope distal end portion main body 30 are adhered, and may be a structure in which other components of the camera 10a and the endoscope distal end portion main body 30 are adhered. In particular, in the case of the configuration in which the 2 nd adhesively-fixing section is located closer to the base end side than the 1 st adhesively-fixing section, even in the configuration in which the 2 nd adhesively-fixing section is bonded to the endoscope distal end portion body 30 and the optical component holder 20, a force is hardly applied to the 1 st adhesively-fixing section.

In the example shown in fig. 2, the protrusion 20a of the optical component holder 20 is provided on a part of the outer peripheral surface of the end surface on the distal end side of the optical component holder 20 in the circumferential direction, but the present invention is not limited thereto as long as the camera head can be detached from the endoscope distal end portion body by being pressed by the pressing member.

For example, as the protruding portion 20b of the camera 10b shown in fig. 5, the protruding portion 20b may be provided on the entire circumferential periphery of the outer circumferential surface of the optical component holder 20. The protruding portion 20b may extend from the distal end side to the proximal end side of the optical component holder 20. In fig. 5, the same reference numerals are given to components having the same configurations as those in fig. 2, and the description thereof is omitted. This is the same for the other figures.

Alternatively, as the protruding portion 20c of the camera 10c shown in fig. 6, the protruding portion 20c may have a polygonal shape when viewed from the axial direction.

In the example shown in fig. 2, the optical component holder 20 has 1 projection 20a, but the present invention is not limited to this, and a plurality of projections may be provided at a plurality of locations in the circumferential direction on the outer circumferential surface of the optical component holder 20.

In the example shown in fig. 2, the optical component holder 20 has a protruding portion on the distal end side, but the present invention is not limited to this, and the protruding portion may be formed at any position in the axial direction. The protruding portion is preferably provided on the distal end side of the optical component holder 20 from the viewpoint of more reliably performing the pressing by the pressing member.

In the example shown in fig. 3 and 4, the opening 33a of the endoscope distal end portion body 30 is connected to the through portion 32 in the distal end surface 31, but the present invention is not limited to this. As shown in fig. 7 and 8, the opening 33b may be formed in the distal end surface 31 so as to be separated from the through portion 32 in the endoscope distal end portion 40 b. Further, since the camera 10a needs to be inserted into the through portion 32 from the proximal end side, the opening 33b is connected to the through portion 32 at the proximal end side as shown in fig. 8.

When the opening 33b is formed in the distal end surface 31 so as to be separated from the through portion 32, the shape of the opening 33b is not particularly limited. For example, when the opening surface of the opening 33b has a circular shape, the diameter of the opening surface may be 0.1mm or more.

In the example shown in fig. 3 and 4, the opening 33a of the endoscope distal end portion main body 30 is formed in the distal end surface 31 at a part of the edge portion of the through portion 32, but the present invention is not limited to this. As shown in fig. 9 and 10, the endoscope distal end portion 40c may be configured such that the opening 33c is formed in the distal end surface 31 over the entire periphery of the edge portion of the through portion 32. That is, the opening 33c may have a circular ring shape.

In the case of the configuration in which the camera head 10b shown in fig. 5 is inserted into the endoscope distal end portion main body 30 having the opening 33c, a cylindrical member having substantially the same size as the opening 33c may be used as a pressing member when the camera head 10b is detached from the endoscope distal end portion main body 30.

In the endoscope of the present invention, the opening of the endoscope distal end portion body may be hermetically sealed by an airtight member.

For example, the opening 33a of the endoscope distal end portion shown in fig. 11 is hermetically sealed by a hermetic member 44. This can prevent the medicine or the like from entering the inside through the opening 33a and adversely affecting the adhesion fixing portion between the adhesion fixing members.

As the airtight member 44, silicone rubber (Shin-Etsu Chemical C)_oLtd. KE45B, KE445B, etc.).

In the case of an endoscope having the airtight member 44, the airtight member 44 and the 2 nd adhesion fixing section 42 that adheres the endoscope distal end portion main body 30 to the camera head 10a preferably have a gap. Alternatively, the airtight member 44 and the 2 nd adhesion fixing portion 42 preferably have a joint surface. That is, the airtight member 44 and the 2 nd adhesion fixing portion 42 are preferably not integrated or adhered.

Thereby, when detaching the endoscope camera, the airtight member can be removed alone first. When the airtight member is to be removed while being fixed to the 2 nd adhesion fixing portion, there is a possibility that the resistance of the airtight member is applied to the 1 st adhesion fixing portion as a load.

[2 nd embodiment ]

An endoscope according to embodiment 2 of the present invention includes:

an endoscope camera having a lens, a lens barrel holding the lens, an imaging element, an optical member disposed between the lens barrel and the imaging element and guiding light having passed through the lens to the imaging element, an optical member holder holding the lens barrel and the optical member, and an outer cylinder member into which the optical member holder is inserted; and

Further, in an endoscope according to embodiment 2 of the present invention, a method of disassembling an endoscope in an endoscope having a through-hole into which an endoscope head is inserted, from an endoscope distal end portion body having a lens, a lens barrel holding the lens, an imaging element, an optical member disposed between the lens barrel and the imaging element and guiding light having passed through the lens to the imaging element, an optical member holder holding the lens barrel and the optical member, and an outer tube member into which the optical member holder is inserted,

the endoscope camera and the outer tube member are detached from the endoscope distal end portion body by pressing the outer tube member from the distal end side using the pressing member.

Fig. 12 is a perspective view schematically showing an example of an endoscope camera provided in an endoscope according to embodiment 2 of the present invention. Fig. 13 is a perspective view schematically showing an example of the distal end portion of an endoscope including the endoscope camera shown in fig. 12. Fig. 14 shows an axial section through fig. 13. The endoscope of embodiment 2 also has the same structure as the conventional endoscope except for the portion of the distal end portion, as in embodiment 1.

First, the configuration of the endoscope camera will be described with reference to fig. 12.

The camera 50a shown in fig. 12 includes a lens 12, a lens barrel 14 that holds the lens 12, a sensor 16, a prism 18, an optical component holder 20, a circuit board 22, a protective member 24, and an outer cylinder member 52. The camera 50a has the same configuration as that of the camera of embodiment 1 except that the optical member holder 20 does not have a projection and has the outer cylinder member 52, and therefore the same parts are denoted by the same reference numerals and different parts are mainly described.

The outer tube member 52 is a tubular member, and the optical component holder 20 is inserted therein. The outer peripheral surface of the optical component holder 20 is bonded and fixed to the inner surface of the outer tube member 52. The outer cylinder member 52 is not fixed to the lens barrel 14.

In the example shown in fig. 12, the outer tube member 52 is disposed such that the end surface on the distal end side is substantially the same as the position of the end surface on the distal end side of the lens barrel 14 in the axial direction.

Next, an endoscope distal end portion 60a having the camera 50a shown in fig. 12 will be described with reference to fig. 13 and 14.

The endoscope distal end portion 60a shown in fig. 13 and 14 includes a camera 50a and an endoscope distal end portion main body 30. The endoscope distal end portion main body 30 has the same structure as the endoscope distal end portion main body 30 shown in fig. 3, except that it does not have an opening portion.

As shown in fig. 13 and 14, a camera 50a is inserted into the through portion 32 of the endoscope distal end portion body 30, and the outer peripheral portion of the outer tube member 52 of the camera 50a is bonded and fixed to the inner surface of the through portion 32. That is, the through portion 32 is a through hole having substantially the same shape as the outer shape of the outer tube member 52.

In such an endoscope, in the disassembling method of the endoscope in which the camera 50a is detached from the endoscope distal end portion main body 30, as shown in fig. 14, by pressing the outer tube member 52 from the distal end side toward the base end side, the part where the outer tube member 52 and the endoscope distal end portion main body 30 are adhesively fixed is peeled off. Thereby, the camera 50a can be detached from the endoscope distal end portion main body 30.

At this time, since a pressing force is not applied to a portion where the lens barrel 14 and the optical component holder 20 are adhesively fixed, it is possible to prevent a relative position between the lens barrel 14 and the optical component holder 20, that is, a relative position between the lens barrel 14 and the prism 18 from being shifted. Therefore, the focus shift can be prevented. Further, since the surface of the lens 12 is not pressed, damage to the lens can be prevented. Therefore, the detached camera can be reused, and when the camera is reused, it is not necessary to readjust the focus or the like, so that the camera can be easily reused.

Here, the outer diameter of the outer tube member 52 is preferably larger than the outer diameter of the lens barrel 14 by 0.2mm or more. This enables the outer tube member 52 to be reliably pressed without pressing the lens barrel 14 when the camera is detached.

The outer tube member preferably has an endoscope distal end portion main body positioning portion that is positioned in contact with the endoscope distal end portion main body.

For example, in the endoscope distal end portion 60b shown in fig. 15, the outer tube member 52 has an endoscope distal end portion main body positioning portion 53 protruding radially outward on the end surface on the proximal end side. The endoscope distal end portion main body positioning portion 53 abuts on the end surface on the proximal end side of the through portion 32 of the endoscope distal end portion main body 30, and thereby the camera 50b can be positioned with respect to the endoscope distal end portion main body 30.

The shape of the endoscope distal end portion main body positioning portion 53 is not particularly limited as long as it can be positioned by abutting against the end surface on the proximal end side of the through portion 32 of the endoscope distal end portion main body 30.

For example, as shown in fig. 16, the camera 50b may be configured such that the endoscope distal end portion main body positioning portion 53a is provided on the entire circumference of the outer circumferential surface of the outer tube member 52 in the circumferential direction.

Alternatively, as in the camera 50c shown in fig. 17, a part of the outer peripheral surface of the outer tubular member 52 in the circumferential direction may be a part where the endoscope distal end portion main body positioning portion 53b is not formed.

Alternatively, as shown in fig. 18, the camera 50d may be configured such that the endoscope distal end portion main body positioning portion 53c is provided at a part of the outer peripheral surface of the outer tube member 52 in the circumferential direction.

As shown in fig. 19, the optical component holder 20 preferably includes an outer tube component positioning portion 21 that is positioned in contact with the outer tube component 52. The outer tube member positioning portion 21 abuts on the end surface of the outer tube member 52 on the proximal end side, whereby the outer tube member 52 and the optical component holder 20 can be positioned.

Further, the outer tube member positioning portion 21 may be provided on the entire circumference of the outer circumferential surface of the optical member holder 20 in the circumferential direction, may be provided on a part of the outer circumferential surface in the circumferential direction, or may be provided in plurality on a part of the outer circumferential surface in the circumferential direction.

Further, the space between the lens barrel and the outer tube member may be hermetically sealed by an airtight member.

For example, a space between the lens barrel 14 and the outer cylinder member 52 at the distal end portion of the endoscope shown in fig. 20 is hermetically sealed by a hermetic member 62. This can prevent a drug or the like from entering the inside through the gap between the lens barrel 14 and the outer tube member 52 and adversely affecting the adhesion fixing portion between the adhesion fixing members.

As the airtight member 62, the same sealing material as the airtight member 44 described above can be used.

The endoscope and the method for disassembling the endoscope according to the present invention have been described in detail above by referring to various embodiments, but the present invention is not limited to the above examples, and it is needless to say that various improvements and modifications can be made without departing from the scope of the present invention.

Description of the symbols

1-endoscope system, 2-endoscope, 3-light source unit, 4-processor unit, 10a, 10b, 10 c-endoscope camera, 12-lens, 14-lens barrel, 16-imaging element (sensor), 17-cover glass, 18-optical component (prism), 20-optical component holder, 20a, 20b, 20 c-protrusion, 21-outer barrel component positioning part, 22-circuit board, 24-protective component, 26-cable, 30-endoscope front end body, 31-front end face of endoscope front end body, 32-through part, 33a, 33b, 33 c-opening part, 40a, 40b, 40 c-endoscope front end part, 42-2 nd adhesive fixing part, 44, 62-airtight component, 52-outer cylinder member, 53a, 53b, 53 c-endoscope distal end portion main body positioning section, 60a, 60 b-endoscope distal end portion.

Claims

1. An endoscope, comprising:

an endoscope distal end portion main body having a through portion into which the endoscope camera is inserted,

the lens barrel is embedded in the optical component holder, the outer peripheral surface of the lens barrel and the inner surface of the optical component holder are fixedly bonded through a 1 st bonding fixing part,

the optical component holder has a protruding portion that protrudes outward in a radial direction of the lens barrel than an outer peripheral surface of the lens barrel,

the endoscope distal end portion main body has an opening portion that penetrates in an axial direction from a distal end surface of the endoscope distal end portion main body at a position where at least a part overlaps with the protruding portion of the optical component holder when viewed in the axial direction of the lens barrel,

the opening has a size that allows a circle having a diameter of 0.1mm or more to be inscribed therein.

2. The endoscope of claim 1,

the opening portion is hermetically sealed by a hermetic member.

3. The endoscope of claim 2,

the airtight component is a seal.

4. The endoscope of claim 2 or 3,

a joint surface or a gap is provided between the airtight member and the 2 nd adhesion fixing portion.

5. The endoscope of any one of claims 1 to 3,

the 2 nd adhesion fixation part is located closer to the base end side than the 1 st adhesion fixation part.

6. An endoscope, comprising:

the lens barrel is fitted to the optical component holder, an outer peripheral surface of the lens barrel is bonded and fixed to an inner surface of the optical component holder,

7. The endoscope of claim 6,

the endoscope has:

and an airtight member that hermetically seals between the lens barrel and the outer tube member.

8. The endoscope of claim 7,

the airtight component is a seal.

9. The endoscope of any one of claims 6 to 8,

the outer diameter of the outer cylinder member is larger than the outer diameter of the lens barrel by 0.2mm or more.

10. The endoscope of any one of claims 6 to 8,

the optical component holder has an outer tube member positioning portion that is positioned by being brought into contact with the outer tube member.

11. The endoscope of any one of claims 6 to 8,

the outer tube member has an endoscope distal end portion main body positioning portion that is positioned in contact with the endoscope distal end portion main body.

12. A method of detaching an endoscope camera from an endoscope distal end portion body having a lens, a lens barrel that holds the lens, an imaging element, an optical component that is disposed between the lens barrel and the imaging element and guides light that has passed through the lens to the imaging element, and an optical component holder that holds the lens barrel and the optical component, the method comprising the steps of,

the endoscope distal end portion main body has an opening portion penetrating from at least a distal end surface of the endoscope distal end portion main body to a position of the protruding portion at least at a position at which at least a part of the endoscope distal end portion main body overlaps the protruding portion of the optical component holder when viewed in an axial direction of the lens barrel,

the endoscope camera is detached from the endoscope distal end portion body by inserting a pressing member from the opening of the endoscope distal end portion body to press the protruding portion of the optical component holder.

13. A method of detaching an endoscope camera from an endoscope distal end portion body having a lens, a lens barrel that holds the lens, an imaging element, an optical member that is disposed between the lens barrel and the imaging element and guides light having passed through the lens to the imaging element, an optical member holder that holds the lens barrel and the optical member, and an outer tube member into which the optical member holder is inserted, the endoscope distal end portion body having a through portion into which the endoscope camera is inserted,

the endoscope camera is detached from the endoscope distal end portion body by pressing the outer tube member from the distal end side using a pressing member.