JP2013031606A - Fiber scope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a cost required during replacement by reducing replacement components by reusing parts in which defects are not generated.SOLUTION: A fiber scope includes: a fiber 4 mounted with a lens 5 to one end part; a sleeve 9 mounted to the other end part of the fiber 4 and covering the outer periphery of the fiber 4; an image converting part for photoelectrically converting an optical image taken from a lens 5 and passing through the fiber 4; a connecting component 7 formed with a through-hole 7a through which the fiber 4 penetrates and detachably connecting the sleeve 9 at a predetermined position of the image converting part while the fiber 4 penetrates through the through-hole 7a; and an elastic body 8 provided between the sleeve 9 and the connecting component 7 and urging the sleeve 9 in the direction of the image converting part when mounting the sleeve 9 at the predetermined position. A diameter R of the through-hole 7a is larger than an outer diameter r of the lens 5 and smaller than an outer diameter Rof the elastic body 8.

Description

  The present invention relates to a fiberscope for photographing details and the inside of an object.

  Conventionally, fiberscopes (endoscopes) have been used for photographing details and the inside of an object in the medical field and the industrial field. The fiberscope is generally composed of a fiber (optical fiber) and an image conversion unit (photoelectric conversion unit). The fiber is equipped with a lens for imaging at the tip (one end). A connection component for connecting to the image conversion unit is attached to the other end of the fiber, and the image conversion unit and the fiber are detachable. In such a fiberscope, an image captured by a lens is sent to an image conversion unit through a fiber, converted into an electrical signal by the image conversion unit, and then displayed as an image on a monitor or the like.

  For example, a scope unit for a portable terminal that can be easily attached to a portable terminal such as a camera-equipped cellular phone and obtain an image of a narrow place or the like is disclosed (see Patent Document 1). The scope unit for a portable terminal includes an imaging lens that obtains an optical image of a subject, an image guide that transmits the optical image to a camera lens of a mobile phone, a light guide that has one end disposed in the vicinity of the imaging lens, and light that is directed toward the end of the ride guide. It is equipped with a lighting device that introduces A suction cup is provided as a mounting means (connecting part) for detachably mounting the terminal end of the image guide to the mobile phone. The suction surface of the suction cup is attached to the periphery of the camera lens of the mobile phone. The unit is detachably attached to the mobile phone.

  Since the fiber scope is thin and the lens attached to the tip is extremely small, the fiberscope is likely to be damaged such as scratches and cracks. Therefore, in order to connect to the image conversion unit at the time of replacement, the replacement including the connection parts, that is, the entire fiber and connection parts are generally replaced. As described above, the scope unit for portable terminal of Patent Document 1 is configured to be detachable from the mobile phone by the suction cup as the mounting means. However, when the image guide is replaced, the mounting means such as the image guide and the suction cup is used. Both must be exchanged together.

  However, if the entire fiber (including the lens) and connection parts are replaced when replacing the fiberscope, all parts that make up the fiber and connection parts will be replaced with new parts, even if there are parts that have not failed. As a result, there was a problem that the cost at the time of replacement would be high.

  The present invention has been made in view of the above, and an object of the present invention is to obtain a fiberscope that reduces the number of replacement parts by reusing parts that do not cause defects and reduces the cost of replacement. .

  In order to solve the above-described problems and achieve the object, the fiberscope of the present invention includes an optical transmission medium having a lens attached to one end thereof, an optical transmission medium attached to the other end of the optical transmission medium, and A covering member that covers the outer periphery of the optical transmission medium, an image conversion unit that photoelectrically converts an optical image taken from the lens and passed through the optical transmission medium, and a first through hole through which the optical transmission medium passes are formed. With the optical transmission medium penetrating through the first through hole, a connecting member that detachably connects the covering member to a predetermined position of the image conversion unit, and provided between the covering member and the connecting member, An elastic member that urges the covering member in the direction of the image conversion unit when connecting the covering member to the predetermined position, and the diameter of the first through hole is larger than the outer diameter of the lens, Smaller than the outer diameter of the elastic member And wherein the door.

  According to the present invention, it is possible to reduce the number of replacement parts by reusing parts that do not cause problems, and to reduce the cost required for replacement.

FIG. 1 is an overall configuration diagram of the fiberscope according to the first embodiment. FIG. 2 is a cross-sectional view illustrating an internal configuration of the image conversion unit of the fiberscope according to the first embodiment. FIG. 3A is a cross-sectional view of the fiber used in the present embodiment. FIG. 3-2 is a cross-sectional view of the fiber used in the present embodiment. FIG. 4 is a diagram illustrating the fiber portion when removed from the image conversion unit. FIG. 5 is an explanatory diagram for connecting the fiber portion to the image conversion unit. FIG. 6 is an enlarged view of the sleeve and the mirror cone. FIG. 7 is a diagram illustrating a fiber portion when removed from the image conversion unit. FIG. 8 is an explanatory diagram when the connecting component is removed from the fiber. FIG. 9 is a diagram illustrating a fiber portion when removed from the image conversion unit. FIG. 10 is an explanatory diagram when the connecting component and the elastic body are removed from the fiber. FIG. 11A is a side view of the connection component of the present embodiment. FIG. 11-2 is a perspective view of the connection component of the present embodiment. FIG. 12 is an explanatory diagram when the connecting component is removed from the fiber. FIG. 13 is an explanatory diagram when the connecting component is removed from the fiber. FIG. 14 is an explanatory diagram when the connecting component and the spring are removed from the fiber.

  Exemplary embodiments of a fiberscope according to the present invention will be explained below in detail with reference to the accompanying drawings.

(Embodiment 1)
FIG. 1 is an overall configuration diagram of the fiberscope according to the first embodiment. FIG. 2 is a cross-sectional view illustrating an internal configuration of the image conversion unit of the fiberscope according to the first embodiment. As shown in FIGS. 1 and 2, the fiberscope includes a monitor 1, an image output harness 2, an image conversion unit 3, a fiber 4, a lens 5, and a connection unit 6 (connection component 7 and elastic body 8). And a sleeve 9 (see FIG. 4).

  In the fiberscope, the fiber part (lens 5, fiber 4 and sleeve 9) is detachably connected to the image conversion unit 3 by the connecting unit 6 for convenience when exchanging and storing parts. The fiber parts that are prone to wear, scratches, and damage due to the use of can be replaced.

  The lens 5 is attached to one end (tip) of the fiber 4 and photographs the details and the inside of the object, and is an optical element that refracts and diffuses or converges light.

  The fiber 4 is a type of cable used for communication, and is a cable that converts data into an optical signal and transmits it. The fiberscope is used when photographing the inside of the body at a medical site, or when photographing a very narrow part in the apparatus at a factory. Therefore, the fiber is required to be extremely thin. In this embodiment, a fiber having a diameter of 2 mm is used as an example.

  3A and 3B are cross-sectional views of the fiber used in the present embodiment. 3A is a cross-sectional view perpendicular to the light traveling direction, and FIG. 3B is a cross-sectional view parallel to the light traveling direction including the vicinity of the center of the fiber 4.

  As illustrated in FIGS. 3A and 3B, the fiber 4 includes a plurality of fibers 4a provided near the center and a plurality of fibers 4b provided outside the fibers 4a. The fiber 4a and the fiber 4b are the same material as the fiber itself. Illumination light emitted from a light source such as an LED (Light Emitting Diode) 37 (see FIG. 6) passes through the fiber 4b. An image (optical image) captured from the lens 5 passes through the fiber 4a.

  The image conversion unit 3 photoelectrically converts an image (optical image) taken from the lens 5 and passed through the fiber 4. The image conversion unit 3 is mainly composed of a substrate 31, an image sensor 32, a lens group 33, and a mirror cone 34, and these are accommodated in one BOX.

  The mirror cone 34 is formed in a conical shape on the fiber 4 side, and the image (optical image) captured by the lens 5 and passing through the fiber 4 is reflected by the conical inner wall that is a mirror surface, and is incident on the lens group 33. It is something to be made. The lens group 33 forms an image captured by the lens 5 incident from the mirror cone 34. The image sensor 32 photoelectrically converts (converts it into an electrical signal) an image (optical image) formed by the lens group 33, and is, for example, a CCD (Charge Coupled Device Image Sensor). The substrate 31 is to which the image sensor 32 is fixed. The image conversion unit 3 has a hole for connecting an AC adapter to a BOX in which each component is accommodated, and power is supplied from the outside via the AC adapter (not shown).

  The image output harness 2 is a wiring that transmits the electrical signal sent from the image conversion unit 3 to the monitor 1. The monitor 1 receives the electrical signal sent from the image conversion unit 3 and displays an image based on the electrical signal.

  Here, a flow until an image of an object photographed with a fiberscope is output from the monitor 1 will be described. First, an image captured from the lens 5 attached to the tip of the fiber 4 advances with total reflection inside the fiber 4 and is sent to the image conversion unit 3. In the image conversion unit 3, the image sent from the fiber 4 passes through the frame of the mirror cone 34 and is formed by the lens group 33. The formed image is photoelectrically converted by the image pickup device 32 and is output as an image to the screen of the monitor 1 through the substrate 31 and the image output harness 2.

  The connecting portion 6 is for detachably connecting the fiber portion (fiber 4, lens 5, and sleeve 9) and the image converting portion 3, and includes a connecting component 7 and an elastic body 8.

  FIG. 4 is a diagram illustrating the fiber portion when removed from the image conversion unit. As shown in FIG. 4, the fiber 4 passes through the connection component 7 and the elastic body 8. A lens 5 is attached to one end (front end) of the fiber 4, and a sleeve 9 is attached to an end (rear end) opposite to the end where the lens 5 is attached. In FIG. 4, the arrow A direction (direction in which the fiber 4 is inserted into the image conversion unit 3) that is the direction in which the fiber 4 is fastened to the image conversion unit 3 is the X axis, the direction perpendicular to the X axis and toward the upper side of the paper is the Y axis, The direction perpendicular to the X axis and from the back side to the front side is defined as the Z axis. In addition, the connection component 7 and the elastic body 8 are perspective views described obliquely with respect to the fiber 4 so that the overall shape can be easily grasped.

  The connection component 7 is for detachably connecting the sleeve 9 to a predetermined position of the image conversion unit 3, is formed in a columnar shape, and the mounting side of the sleeve 9 is opened. Further, the connecting component 7 has a through hole 7a in the X direction formed near the center of the YZ plane, and the fiber 4 passes through the through hole 7a. The diameter of the through hole 7 a is larger than the outer diameter of the lens 5 and smaller than the outer diameter of the elastic body 8. Details will be described later (see FIG. 7).

  The elastic body 8 is an elastic member formed in a cylindrical shape, and is provided between the sleeve 9 and the connection component 7. The elastic body 8 biases the sleeve 9 when the connecting component 7 attaches the sleeve 9 to a predetermined position of the image conversion unit 3. The elastic body 8 also has a through hole 8a in the X direction formed near the center of the YZ plane, and the fiber 4 passes through the through hole 8a. The diameter of the through hole 8 a is larger than the outer diameter of the lens 5 and smaller than the outer diameter of the sleeve 9. Details will be described later (see FIG. 9).

  The sleeve 9 is formed in a cylindrical shape and is mounted near the end (rear end) opposite to the end where the lens 5 of the fiber 4 is mounted, and covers the periphery of the fiber 4 along the outer periphery of the fiber 4 (covering) To do). In the present embodiment, as an example, a sleeve 9 having a thickness of about 1 mm and a length of about 2 cm covers the fiber 4, and the end of the sleeve 9 is formed in a conical shape. The rear end of the fiber 4 protrudes like a core. Here, the sleeve 9 is formed in a pencil-like shape, but is not limited to this, and any shape that covers the fiber 4 and allows the rear end of the fiber 4 to protrude may be used.

  FIG. 5 is an explanatory diagram for connecting the fiber portion to the image conversion unit. As shown in FIG. 5, each component of the image conversion unit 3 is accommodated in the BOX as described above. A hole 35 for inserting the sleeve 9 attached to the fiber 4 is formed from the outer wall of the BOX toward the inside. An adapter 36 coaxial with the hole 35 is attached to the outer wall of the BOX. An external thread is formed on the outer periphery of the adapter 36, and an internal thread is formed on the inner wall of the opened portion of the connection component 7 so that the adapter 36 can be fastened.

  When the fiber part is connected to the image conversion unit 3, the sleeve 9 attached to the fiber 4 is inserted into the hole 35 of the image conversion unit 3 in the direction of the arrow A, and the connection component 7 is fastened to the adapter 36. The sleeve 9 (and the fiber 4 covered with the sleeve 9) is biased to a predetermined position inside the image conversion unit 3 via 8. Here, the predetermined position indicates a position where the rear end of the fiber 4 protruding from the sleeve 9 attached to the fiber 4 is fixed in contact with the end of the mirror cone 34.

  FIG. 6 is an enlarged view of the sleeve and the mirror cone. In FIG. 6, the fiber portion is connected to the image conversion unit 3. When the fiber part is fastened to the BOX with the connection component 7, the connection component 7 presses the elastic body 8, and the sleeve 9 is pressed against the mirror cone 34 by the pressing force, so that the positioning is ensured. As shown in FIG. 6, when the rear end 4 c of the fiber 4 comes into contact with the end of the conical portion 34 a of the mirror cone 34, the light emitted from the LED 37 installed inside the image conversion unit 3 is reflected by the mirror cone. The light is reflected by the outer wall of the conical portion 34 a of 34 and enters the fiber 4 b, and supplies light to the lens 5 attached to the tip of the fiber 4.

Next, the details of the through holes formed in the connection component 7 and the elastic body 8 will be described. FIG. 7 is a diagram illustrating a fiber portion when removed from the image conversion unit. FIG. 8 is an explanatory diagram when the connecting component is removed from the fiber. In FIG. 7, the diameter of the through-hole 7a of fiber 4 connecting parts 7 passes through R, the outer diameter of the lens 5 mounted on the distal end of the fiber 4 r, the outer diameter of the elastic body 8 in a R _1. At this time, the relation r <R <R ₁ is established.

  Thus, since the diameter R of the through hole 7a of the connection component 7 is larger than the outer diameter r of the lens 5 (r <R), the connection component 7 is pulled out in the direction of arrow B as shown in FIG. Can be removed. Therefore, the connection component 7 removed from the fiber 4 can be reused when there is no problem such as damage. That is, when exchanging the fiber portion, it is possible to exchange only the fiber 4, the lens 5, the sleeve 9, and the elastic body 8 without exchanging the connection component 7, and the cost required for the exchange can be reduced.

Meanwhile, since the diameter R of the through-hole 7a of the connecting part 7 is smaller than the outer diameter R ₁ of the elastic body 8 (R <R _1), connection part 7, the rear end of the fiber 4 which sleeve 9 is mounted (arrow It cannot be pulled out in the direction opposite to direction B). Therefore, when the fiber 4 is connected to the image conversion unit 3, the connection component 7 is surely in contact with the elastic body 8, and the sleeve 9 is reliably pressed against a predetermined position in the BOX of the image conversion unit 3. Can do.

FIG. 9 is a diagram illustrating a fiber portion when removed from the image conversion unit. FIG. 10 is an explanatory diagram when the connecting component and the elastic body are removed from the fiber. In FIG. 9, the diameter of the through hole 8 a through which the fiber 4 of the elastic body 8 passes is R ₂ , the outer diameter of the lens 5 attached to the tip of the fiber 4 is r, and the outside of the sleeve 9 attached to the rear end of the fiber 4. It is set to _{r m} diameter. In this case, a state where the relationship is made up of _{r <R} 2 _{<r m.}

Thus, for larger than the outer diameter r of the diameter R ₂ is a lens 5 of the through hole 8a of the elastic body 8 (r <R _2), as shown in FIG. 10, remove the elastic body 8 in the arrow B direction fiber 4 can be removed. Therefore, the connection component 7 and the elastic body 8 removed from the fiber 4 can be reused when there is no problem such as damage. That is, when exchanging the fiber portion, it is possible to replace only the fiber 4, the lens 5, and the sleeve 9 without exchanging the connection component 7 and the elastic body 8, thereby further reducing the cost of the replacement.

Meanwhile, since the diameter _{R 2} of the through hole 8a of the elastic body 8 is smaller than the outer diameter _{r m} of the sleeve 9 _(R 2 _<r m), the elastic member 8, the rear end of the fiber 4 which sleeve 9 is attached ( It cannot be pulled out in the direction opposite to the arrow B direction. Therefore, when the fiber 4 is connected to the image conversion unit 3, the elastic body 8 is surely in contact with the sleeve 9, and the sleeve 9 can be reliably pressed against a predetermined position in the BOX of the image conversion unit 3. it can.

  As described above, in the fiberscope of the present embodiment, the fiber 4 to which the lens 5 is attached penetrates, and the connection component 7 and the elastic body 8 that connect the fiber portion to the image conversion unit 3 are connected to the distal end side of the fiber 4 (lens 5 can be removed from the mounting side). Therefore, when the fiber part is removed from the image conversion unit 3 and replaced, if one or both of the connection part 7 and the elastic body 8 are not damaged, the fiber part can be removed and reused. As a result, it is possible to reduce the number of replacement parts when replacing the fiber portion, and to reduce the cost for replacement.

(Modification of Embodiment 1)
In the fiberscope of the first embodiment, the elastic body 8 is used when the fiber portion and the image conversion unit 3 are connected. In this modification, the elastic body 8 is made of metal. Thus, when the elastic body 8 is made of metal, it is superior in wear resistance to an elastic body such as rubber, and is resistant to changes in the environment such as temperature, so that it deteriorates with time and is used for a long time. It becomes possible.

(Embodiment 2)
The fiberscope of the first embodiment has a configuration in which a fiber having a lens 5 attached to the front end and a sleeve 9 attached to the rear end is connected to the image conversion unit 3 by the connecting component 7 and the elastic body 8. The fiberscope of the present embodiment has a configuration in which a connecting part and an elastic body are integrally formed.

  Since the entire configuration of the fiberscope is the same as that of the first embodiment, description thereof is omitted (see FIG. 1 and the like), and connection parts having different configurations will be described. FIG. 11A is a side view of the connection component of the present embodiment. FIG. 11-2 is a perspective view of the connection component of the present embodiment.

  As shown in FIGS. 11-1 and 11-2. The connection component 10 according to the present embodiment is a combination of the connection component 7 and the elastic body 8 according to the first embodiment. The connecting component 10 is detachably connected to the sleeve 9 at a predetermined position of the image conversion unit 3, and biases the sleeve 9 when the sleeve 9 is mounted at a predetermined position of the image conversion unit 3. . Further, the connecting component 10 has a through hole 10a in the X direction formed near the center of the YZ plane, and the fiber 4 penetrates the through hole 10a. The diameter of the through hole 10 a is larger than the outer diameter of the lens 5 and smaller than the outer diameter of the sleeve 9.

  FIG. 12 is an explanatory diagram when the connecting component is removed from the fiber. Since the diameter of the through hole 10a of the connecting component 10 is larger than the outer diameter of the lens 5, the connecting component 10 can be pulled out in the direction of arrow B and removed from the fiber 4 as shown in FIG. Therefore, the connection component 10 removed from the fiber 4 can be reused when there is no problem such as damage. That is, when replacing the fiber portion, it is possible to replace only the fiber 4, the lens 5, and the sleeve 9 without replacing the connection component 10, thereby reducing the cost of the replacement.

  On the other hand, since the diameter of the through hole 10a of the connection component 10 is smaller than the outer diameter of the sleeve 9, the connection component 10 is pulled out to the rear end side (direction opposite to the arrow B direction) of the fiber 4 to which the sleeve 9 is attached. I can't. Accordingly, when the fiber 4 is connected to the image conversion unit 3, the connection component 10 is surely in contact with the sleeve 9, and the sleeve 9 can be reliably pressed to a predetermined position in the BOX of the image conversion unit 3. it can.

  As described above, in the fiberscope of the present embodiment, the fiber 4 to which the lens 5 is attached penetrates, and the connection component 10 that connects the fiber portion to the image conversion unit 3 is the tip side of the fiber 4 (the lens 5 attachment side). ). Therefore, when the fiber part is removed from the image conversion unit 3 and replaced, if there is no problem such as damage to the connection part 10, it can be removed from the fiber part and reused. As a result, the fiber part can be reused. It is possible to reduce the number of replacement parts for replacement and reduce the cost for replacement.

(Embodiment 3)
The fiberscope of the first embodiment has a configuration in which a fiber having a lens 5 attached to the front end and a sleeve 9 attached to the rear end is connected to the image conversion unit 3 by the connecting component 7 and the elastic body 8. The fiberscope of the present embodiment is configured using a spring as an elastic body.

  Since the entire configuration of the fiberscope is the same as that of the first embodiment, description thereof is omitted (see FIG. 1 and the like), and an elastic body having a different configuration will be described. FIG. 13 is an explanatory diagram when the connecting component is removed from the fiber. FIG. 14 is an explanatory diagram when the connecting component and the spring are removed from the fiber.

  The spring 80 is a coil spring-shaped elastic member, and is provided between the sleeve 9 and the connection component 7, and biases the sleeve 9 when the sleeve 9 is attached to a predetermined position of the image conversion unit 3. Is. Since the spring 80 is wound in a coil shape, a hole 80a in the X direction is formed near the center of the YZ plane, and the fiber 4 passes through the hole 80a. The diameter of the hole 80 a is larger than the outer diameter of the lens 5 and smaller than the outer diameter of the sleeve 9. Here, a coil spring is used as the spring 80, but the present invention is not limited to this, and a configuration using a plate spring, a spring washer, or the like may be used as the spring 80.

  Similar to the first embodiment, the diameter of the through hole 7a of the connection component 7 is larger than the outer diameter of the lens 5, so that the connection component 7 can be pulled out in the direction of arrow B and removed from the fiber 4 as shown in FIG. it can. Therefore, the connection component 7 removed from the fiber 4 can be reused when there is no problem such as damage. That is, when exchanging the fiber portion, it is possible to replace only the fiber 4, the lens 5, the sleeve 9, and the spring 80 without exchanging the connection component 7, thereby reducing the cost of the replacement.

  Similarly to the first embodiment, since the diameter of the through hole 7a of the connection component 7 is smaller than the outer diameter of the spring 80, toward the rear end side of the fiber 4 to which the sleeve 9 is attached (the direction opposite to the arrow B direction). Can not be removed. Therefore, when the fiber 4 is connected to the image conversion unit 3, the connection component 7 is surely in contact with the spring 80, and the sleeve 9 can be reliably pressed to a predetermined position in the BOX of the image conversion unit 3. it can.

  Further, since the diameter of the hole 80a of the spring 80 is larger than the outer diameter of the lens 5, the spring 80 can be pulled out in the arrow B direction and removed from the fiber 4 as shown in FIG. Accordingly, the connection component 7 and the spring 80 removed from the fiber 4 can be reused when there is no problem such as damage. That is, when exchanging the fiber portion, it is possible to replace only the fiber 4, the lens 5, and the sleeve 9 without exchanging the connection component 7 and the spring 80, and the cost required for the exchange can be further reduced.

  Further, since the diameter of the hole 80a of the spring 80 is smaller than the outer diameter of the sleeve 9, the spring 80 cannot be pulled out to the rear end side (the direction opposite to the arrow B direction) of the fiber 4 to which the sleeve 9 is attached. . Therefore, when the fiber 4 is connected to the image conversion unit 3, the spring 80 is surely in contact with the sleeve 9, and the sleeve 9 can be reliably pressed to a predetermined position in the BOX of the image conversion unit 3. .

  Thus, by using a spring as an elastic body, the space occupied as a machine part can be reduced, and the fiber scope can be reduced in size and weight. In addition, when the spring 80 is used as the elastic body, the contact area with the connection component 7 and the sleeve 9 can be reduced, so that the structure with excellent wear resistance can be obtained.

  Further, in the fiberscope of the present embodiment, the fiber 4 to which the lens 5 is attached penetrates, and the connection part 7 and the spring 80 for connecting the fiber part to the image conversion unit 3 are connected to the distal end side of the fiber 4 (the lens 5 is attached). Side). Therefore, when the fiber part is removed from the image conversion unit 3 and replaced, if one or both of the connection part 7 and the spring 80 are not damaged, they can be removed from the fiber part and reused. As a result, it is possible to reduce the number of replacement parts when replacing the fiber portion and reduce the cost required for the replacement.

DESCRIPTION OF SYMBOLS 1 Monitor 2 Image output harness 3 Image conversion part 4 Fiber 5 Lens 6 Connection part 7, 10 Connection part 7a, 10a Through-hole 8 Elastic body 8a Through-hole 9 Sleeve 31 Substrate 32 Imaging element 33 Lens group 34 Mirror cone 35 Hole 36 Adapter 80 Spring 80a Hole

JP 2005-192583 A

Claims (6)

An optical transmission medium with a lens attached to one end;
A covering member attached to the other end of the optical transmission medium and covering an outer periphery of the optical transmission medium;
An image conversion unit that photoelectrically converts an optical image taken from the lens and passed through the optical transmission medium;
A connection member that detachably connects the covering member to a predetermined position of the image conversion unit in a state where a first through hole is formed through which the optical transmission medium passes, and the optical transmission medium passes through the first through hole. When,
An elastic member that is provided between the covering member and the connecting member and biases the covering member in the direction of the image conversion unit when the covering member is connected to the predetermined position;
The diameter of the first through hole is larger than the outer diameter of the lens and smaller than the outer diameter of the elastic member. The elastic member is further formed with a second through-hole through which the optical transmission medium passes, and when the covering member is connected to the predetermined position, the optical transmission medium passes through the second through-hole, Urging the covering member in the direction of the image conversion unit;
2. The fiberscope according to claim 1, wherein a diameter of the second through hole is larger than an outer diameter of the lens and smaller than an outer diameter of the covering member.   The fiberscope according to claim 1 or 2, wherein the connecting member and the elastic member are integrally formed.   The fiberscope according to claim 1, wherein the elastic member is made of metal.   The fiberscope according to claim 1, wherein the elastic member is a spring. A display unit that receives the electrical signal photoelectrically converted by the image conversion unit and displays it as an image;
The fiberscope according to claim 1, further comprising a transmission member that transmits the electrical signal from the image conversion unit to the display unit.

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