WO1997021130A1

WO1997021130A1 - Inspection instrument using optical fiber

Info

Publication number: WO1997021130A1
Application number: PCT/JP1996/000244
Authority: WO
Inventors: Takanobu Matsuda
Original assignee: Kabushiki Kaisha Matsuda Denshi Kogyo
Priority date: 1995-12-01
Filing date: 1996-02-02
Publication date: 1997-06-12
Also published as: JP2001059914A; AU4549296A

Abstract

An inspection instrument which has good operability and portability and uses optical fibers. To visually inspect the object, the instrument comprises an objectif lens (14), an eyepiece portion (16), and an optical fiber cable (12) optically connected at its one end to the objective lens (14) and at the other end thereof to the eyepiece portion (16) and made bendable. A handle portion (30) is provided midway on the optical fiber cable (12), and a portion of the optical fiber cable (12a) is spirally formed between the handle portion (30) and the eyepiece portion (16).

Description

Description Title of Invention

Inspection equipment using optical fiber

The present invention relates to an inspection device using an optical fiber. Background art

Conventionally, as an inspection device using an optical fiber, there is a medical optical fiber scope 60 as shown in FIG. According to this optical fiber scope 60 for medical use, one end of an optical fiber cable (optical fiber 62 for inspection) is optically connected to the objective lens section 66 and the other. The end side is optically connected to the eyepiece lens part 68, and an optical fiber 70 for illumination is wired. The lighting optical fiber 70 branches along the optical fiber 62 for inspection from the front end part to the middle part along the optical fiber 62, and the rear end is connected to the light source device 72. . The light source device 72 includes a light emitting unit 7 and a power supply device 76 having a stable output. The light emitted by the light source device 72 is transmitted by an optical fiber 70 for illumination, and emitted at the tip of the optical fiber scope 60. In this way, the inside of the body can be illuminated via the optical fiber 70 for illumination, and a medical examination can be performed.

However, devices using such optical fibers are not limited to medical applications, but can be used to inspect or observe dark spaces where the entrance is narrow and cannot be directly viewed. Of course, it can be used for various purposes. For example, it can be widely used for general industrial purposes such as inspection of boiler chimneys, various pipes, welds of high-grade containers formed by welding stainless steel, or maintenance of machinery and equipment. Possible There is. Disclosure of the invention

However, in the optical fiber scope 60 described above, a large part of the light emitted by the light source device, which is not transmitted to the optical fiber for illumination 70, is large. A light source device 72 is required, and the eyepiece portion 68 of the optical fiber 62 for inspection and the light source device 72 must be provided separately. For this reason, it is difficult to carry the above optical fiber scope 60 with it.

In addition, for operations such as rotating the objective lens section 66 to adjust the rotational position, the optical fiber 62 for inspection and the optical fiber 70 for illumination are branched in the middle. This is difficult because the eyepiece lens section 68 and the light source device 72 are provided separately. When used for medical treatment, there is no need to read characters, so there is little need to adjust the positional relationship of the appearance, and a wide-angle lens is used as the objective lens. However, the operation of adjusting the rotational position of the objective lens is not particularly important, and the above-mentioned inconvenience has not been a problem.

In addition, the optical fiber scope for medical use requires a large light source device 72 as described above, which complicates the structure, and the optical fiber scope mainly composed of glass. The production cost was high in that it was used, and it did not spread in general industrial fields.

For medical fiber optic scopes, the subject to be inspected is the human body. Due to the danger of electric shock, light bulbs should be installed near the tip of the optical fiber scope. There was no technical thought.

Therefore, an object of the present invention is to provide an inspection apparatus using an optical fiber having good operability and portability.

In order to achieve the above object, the present invention has the following configuration.

That is, the objective lens section, the eyepiece lens section, and one end of the objective lens section. Optical fiber cable that is optically connected to the lens part, the other end is optically connected to the eyepiece lens part, and is provided to bendable. An inspection apparatus using an optical fiber capable of performing an optical inspection, wherein a grip portion is provided in a middle portion of the optical fiber cable, and an optical fiber between the grip portion and the eyepiece lens portion. Since the fiber cable is formed in a helical shape, it is not easily twisted or entangled with other wiring, and is always wound up when no stretching force is applied. Portability and portability.

Further, since the optical fiber cable is formed by arranging a large number of optical fiber single wires mainly composed of plastic in parallel, the optical fiber cable is easily formed into a helical shape, and the impact resistance is improved. And cost can be reduced.

Further, the objective lens portion and a small light bulb for illuminating the object to be inspected are provided in parallel and integrally with a partition wall interposed therebetween. An electric wire that also serves as a battery box for accommodating a battery, or an electric wire connecting between the electric bulb and a power supply, is wired to the optical fiber cable, and is connected to the optical fiber cable. Covered with a common coating material, the inspection equipment using an optical fiber that can appropriately illuminate the object to be inspected can be compacted, improving operability and portability. It can improve and reduce costs.

Further, a fixed support member for supporting the optical fiber cable in a predetermined section from the grip portion to the objective lens portion side, and a fixed support member which is slidably provided on the fixed support member to extend and contract. When the optical fiber cable is extended toward the one end side, a telescopic support member for supporting the optical fiber cable portion corresponding to the extension so as not to bend is provided. In this way, the supporting state of the optical fiber cable at the distal end can be easily adjusted so that the objective lens can be appropriately directed to the object to be inspected that is at least a certain distance away from the object. User operability is improved. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a front view showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing details of a distal end portion of the first embodiment.

FIG. 3 is a front view showing a use state of the first embodiment.

FIG. 4 is an explanatory diagram illustrating a distal end portion of the telescopic support member according to the first embodiment.

FIG. 5 is an explanatory view showing a second embodiment of the present invention.

FIG. 6 is a front view showing a third embodiment of the present invention.

FIG. 7 is a front view showing a fourth embodiment of the present invention.

FIG. 8 is an explanatory diagram for explaining the background art. Example

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

(First embodiment)

FIG. 1 is a front view showing an embodiment of an inspection apparatus using an optical fiber according to the present invention, and FIG. 2 is an enlarged cross-sectional view illustrating a tip portion of the embodiment of FIG.

Reference numeral 10 denotes an optical fiber for inspection. One end of an optical fiber cable 12 is optically connected to the objective lens part 14 and the other end is an eyepiece lens part.

It is configured to be optically connected to 16. The objective lens section 14 is provided so as to suitably connect the image of the object to be inspected to one end face of the optical fiber cable 12, and the eyepiece lens section 16 is provided with an optical fiber. Cable

It is provided so that the image transmitted by 1 2 can be suitably magnified and viewed.

The optical fiber cable 12 is formed by bundling a plurality of optical fiber single wires mainly composed of plastic (in this embodiment, about 600 mm in a diameter of 2 mm).

Zero optical fiber single lines are bundled in parallel alignment. The optical fiber bundle is formed by covering the bundle of single optical fibers with, for example, a polypropylene tube. In addition, optical filters mainly made of plastic _r

5 has the advantage that the impact force is durable and easy to mold. Another advantage is that it is inexpensive. However, it is possible to use an optical fiber whose main material is a glass having high light transmission performance, or to use an optical fiber having various wire diameters. Of course.

As shown in Fig. 2, reference numeral 20 denotes a light bulb, which is small (about 2.9 mm in diameter) but can generate strong light and illuminate an object to be inspected. The bulb may be MAG INSTRUMENT's MAGLITE (trade name) model LM 3A001 (using two AAA batteries, 3V, 140mA) or model 2A001 (using two AA batteries, 3A, 300mA) can be used. According to this “MAGLίTE”, sufficient luminosity can be obtained by using two batteries (AA or AAA). As shown in FIG. 2, the light bulb 20 can be integrally arranged in parallel with the objective lens section 14 and the partition wall 18 therebetween. For this reason, the tip 11 of the present inspection apparatus can be reduced in size. Here, the partition wall 18 may be any as long as it can substantially block the light from the light bulb 20 so as not to leak into the objective lens section 14. Therefore, the side wall of the objective lens part 14 also substantially forms the partition wall 18, and the partition wall can be constituted by a cylindrical member or a reflective film provided or applied around the bulb 20. Note that the partition wall 18 also functions as a reflection surface that efficiently emits light generated from the light bulb 20 toward the inspection object. In addition, the partition wall 18 acts as a heat insulating layer for isolating the heat generated from the bulb 20.

Further, as shown in FIG. 2, the distal end surface of the electric bulb 20 is disposed slightly behind the distal end surface of the objective lens portion 14. This prevents light emitted from the end face of the bulb 20 from directly entering the objective lens, and can illuminate the object to be inspected appropriately. In addition, since the light bulb 20 directly illuminates the object to be inspected, the object to be inspected can be efficiently illuminated.

Reference numeral 21 denotes a protective plate made of a transparent plate such as a glass plate. The protective plate 21 is provided as a cover for protecting the lens part 14 and the light bulb 20-as shown in FIG. 2, the object lens part 14 and the light bulb 20 are protected from each other. By being provided separately, light harmony can be prevented more appropriately. By the way, the distal end portion 11 includes the protective plate 21, the objective lens portion 14, and the electric bulb 20 as its constituent elements.

Reference numeral 30 denotes a grip portion, which is suitably formed as a whole so that the user can grip and operate it. The holding portion 30 also serves as a battery box, and stores dry batteries (two AA batteries) serving as a power source for the light bulb 20. An electric wire 24 is connected to the battery box, and the power of the light bulb 20 is turned on and off by a push switch 34.

20 a is a lead terminal extending from the light bulb 20, and is connected to the electric wire 24 via the socket 22. The electric wire 24 connects the electric bulb 20 and the dry battery via the push switch 34, is wired along the optical fiber cable 12, and is connected to the optical fiber cable. It is coated with the same coating material as 1 2. The optical fiber cable 1 2 the electric wire 24 and the covering material can be freely bent to a predetermined radius of curvature within a range that does not cause permanent deformation.

Reference numeral 12a denotes a curl cord-like portion. The optical fiber cable 12 extending from the grip portion 30 to the eyepiece lens portion 16 is connected to a power cord-like portion (a helical coil). ). According to this, since the optical fiber cable 12 is extended from the grip portion 30 to the eyepiece lens portion 16, the user can use the grip portion 30 (battery box). ) Can be grasped with one hand to operate the tip 11 having the objective lens 14, and the eyepiece lens 16 grasped with the other hand can be drawn to the eyes for viewing. Is improved. And since it is formed in a helical shape, it has the advantage that the distance between the inspected object and the eye can be easily adjusted, and the optical fiber cable 12 is entangled and broken. It is said that it is easy to bend because it is easy to bend and easy to organize. There are advantages too. That is, when the stretching force is not applied due to the elasticity of the optical fiber cable 12 of the curl cord-shaped portion 12a, the fiber is naturally wound up. easy.

Here, a method of forming the above-described optical fiber cable 12 without bending into a helical shape (curl code shape) will be described. First: Wind the optical fiber cable 12 around the bobbin to be wound, and fix it so that it does not come loose. Next, soak the bobbins together in boiling water at about 75 ° C for about 3 to 5 minutes. Then remove it from hot water, cool it, and remove it from the bobbin. Through the above-described steps, the above-mentioned optical fiber cable can be formed into a curl code having a winding having a desired diameter. It was formed into a winding with a diameter of about 5 cm, but had little effect on the light transmission performance of the optical fiber.

In addition, instead of the 7 5 ⁰ C position of the greenhouse of the hot water of the above, also Ru can also this to be molded by use of the hot air. The working method is almost the same as when hot water is used, and this also allows the optical fiber cable to be formed into a curl cord shape. As described above, the plastic optical fiber can be thermoformed at a relatively low temperature, and can be easily formed into a curled code without breaking the core and the clad. Can be molded into

In addition, in the above-mentioned forming process, the optical fiber-to-cable only may be added, or the coating may be applied. For example, if a tube such as polyurethane is used as a coating material and the optical fiber cable is processed in a state of being passed through the tube, the tube itself is also formed into a force cord shape, and the optical fiber is formed. The curled code-like form of the bar cable can be strengthened.

At this time, it is preferable to use a bobbin having a diameter about 30% smaller than a finished dimension in consideration of a return phenomenon of the curl shape in advance. In this way, heating to allow the return phenomenon of the curl shape is performed by gently heating the optical fiber so as not to impair the function of the optical fiber. To be molded.

In the above manufacturing method, the method of thermoforming the optical fiber or the optical fiber and the coating material together to form a curl code is described, but only the coating material is used. Can be thermoformed to form an optical fiber cable in a curl code shape. That is, the optical fiber cable covered with the coating material is wound around a bobbin, heated for a predetermined time at a temperature at which the coating material is thermoformed, and then cooled. The heating temperature at this time is lower than the temperature at which the optical fiber can be thermoformed. In this way, even though the optical fiber is not thermoformed, the coating is formed, so that the optical fiber cable can be shaped into a curl code. You. By using this method, it is possible to easily form curled cords for optical fibers that are not thermoformed at high temperatures, such as optical fibers mainly composed of glass, without dare to thermoform the optical fibers themselves. Optical fiber cable can be molded.

In addition, in the above manufacturing method, the method of heating the optical fiber cable in a state in which the optical fiber cable is wound around the member to be wound (bobbin) is described in detail. If the fiber is heated while being held in a helical shape, it can be formed into a helical shape. For example, if the string is wound in a wound state, it can be held so that the vine-shaped form does not collapse, and can be formed by heating in that state.

In addition, the spiral shape of the optical fiber cable formed into a helical shape is not limited to a circular ring shape, and may be an elliptical ring shape or various types of fibers within a range that does not impair the function of the optical fiber. Needless to say, it can be formed in a ring shape.

At this point, if the optical fiber is bent until it is permanently deformed, the light transmission performance may be reduced. Permanent deformation of optical fibers should be avoided, especially in the communication field where large amounts of information are transmitted. Also In the telecommunications field, once fixed, they do not bend or stretch. For this reason, conventionally, there has been no need to mold and use it in a predetermined shape as described above. The optical fiber can be used after being bent, and can be suitably used even if it is formed into a predetermined shape within an allowable range.

Reference numeral 40 denotes a fixed support member, which is provided in a long shape and supports the other end side of the optical fiber cable 12. The fixed support member 40 is formed in a cylindrical shape and has a rear end fixed to the grip portion 30, and the optical fiber cable 12 passed through the grip portion 30. Is inserted inside.

Reference numeral 42 denotes a flexible tube, the rear end of which is fixed to the front end of the fixed support member 40, and the optical fiber cable 12 passed through the fixed support member 40 is inserted inside. Has been passed. When the flexible tube 42 is bent into a predetermined shape, it can generally hold the bent shape. Therefore, if the optical fiber cable 12 is bent at a predetermined angle and the inspection device using the optical fiber is used, it is difficult to reach Can be seen.

Reference numeral 50 denotes a telescopic support member, which is provided on the fixed support member 40 so as to be able to slide and extend, and is provided at the one end side (end portion 11 side) of the optical fiber cable 12. When the fiber optic cable is stretched, it is supported so that the optical fiber cable that corresponds to the extension does not bend. The telescopic support member 50 is also formed in a long cylindrical shape, and is formed to have a diameter larger than that of the fixed support member 40, and is fitted to the fixed support member 40 so as to be able to slide in the longitudinal direction. are doing. This is a state in which a telescopic antenna used in a mobile radio etc. is installed upside down, and the optical fiber cable 12 is inserted through the inside of the cylinder. The support member 50 is structured so that it can be telescopically expanded and contracted. In this embodiment, the telescopic support member 50 is provided in the middle of the optical fiber cable 12. The supporting force of the fiber optic cable according to the usage conditions

It may be possible to support up to the front end side of (1) and (2). Such a long supporting portion is suitable when the tip of the optical fiber cable 12 is not covered with the flexible tube 42. Next, as for the use state of the above-described embodiment, an example of the operation of seeing a part that cannot be seen unless it is normally disassembled when maintaining a complicated machine is described.

First, the objective lens section 14 of the distal end section 11 of the present inspection apparatus is brought close to the target portion of the inspection object. Since the target part is in a position where the worker cannot see it, the target lens part i 4 is made to enter the gap between the parts by making an approximate registration. At this time, since the tip of the inspection apparatus is miniaturized, it can enter into a small space suitably. This operation can be performed with one hand while the operator holds the grip portion 30.

Next, by pushing the push switch 34 to emit the light bulb 20, the target portion is suitably illuminated. Then, the operator holds the eyepiece lens 16 with the hand opposite to the hand holding the grip portion 30. The operator pulls the eyepiece lens 16 and looks into the target lens. You can see the part.

At this time, even if the distal end of the optical fiber cable 12 is covered with the flexible tube 42, if the distance from the grip portion 30 to the objective lens portion 14 becomes longer, The tip of the flexible tube 42 easily swings, and the shape of the flexible tube 42 once bent is also likely to drop. In particular, as shown in Fig. 3, when the length of the flexible tube 42 increases, even when a small force is applied, the flexible tube 42 hangs down, and the flexible tube 42 drops. The direction has changed, and the desired part cannot be inspected. Therefore, as shown in Fig. 1, if the telescopic support member 50 is extended by sliding it on the distal end side of the optical fiber cable 12, it is possible to respond to the extension. i

The optical fiber cable 12 is supported so that it does not bend. As a result, the portion of the flexible tube 42 that is substantially bent is shortened, and is less likely to sway or drop. Therefore, even when the distance to the object to be inspected is long, the inspection can be suitably performed. In addition, when the length of the substantially bent portion of the flexible tube 42 is increased as shown in FIG. 3, it is suitable for inspecting the inside of a more complicated structure. When the telescopic support member 50 is contracted as shown in FIG. 3, the distal end side of the optical fiber cable 12 can be suitably wound, so that it can be stored and transported. It is convenient when you do. As shown in FIG. 4, a flexible tube 42 and a flexible tube 52 made of vinyl or the like are fitted into the distal end of the elastic supporting member 50, as shown in FIG. The tube 52 can cover the gap between the tubular expandable support member 50 and the flexible tube 42, and prevents dust from entering the expandable support member 50. In addition to this, the flexible tube 42 (the distal end of the optical fiber cable 12) can be suitably supported so as not to swing.

Next, another embodiment according to the present invention will be described.

First, as a configuration in which the telescopic support member 50 can expand and contract in a telescopic manner with respect to the fixed support member 40, as in this embodiment, the telescopic support member 50 can be extended with respect to the fixed support member 40. It is not limited to the configuration in which 0 fits outside. As long as the optical fiber cable 12 can be appropriately extended while correcting the bending of the optical fiber cable 12, the telescopic support member 50 can be fitted inside the fixed support member 40. However, when the telescopic support member 50 fits inside, there is a disadvantage that the telescopic support cable 12 is easily caught by the optical fiber cable 12 when the telescopic support member 50 expands and contracts.

Further, the fixed support member and the telescopic support member are not limited to being formed in a cylindrical shape as in the present embodiment, but may be formed by bending the optical fiber cable 12. The rod may be formed in a long rod shape as long as it can support the straightening. That is, as long as the optical fiber cable 12 can be supported almost straight by connecting the rod-shaped fixed support member and the telescopic support member, the same effect as in the first embodiment can be obtained. Can be obtained. However, if the tube is inserted, the optical fiber cable 12 can be suitably protected, and the optical fiber cable 12 is not exposed, so that it is easy to handle.

Also, one end of the optical fiber cable 12 is passed through and covered with the flexible tube 42, so that a special angle for adjusting the orientation angle of the objective lens section 14 is provided. Although the structure can be simplified without requiring a special mechanism, it is not necessary that the flexible tube be covered with the flexible tube 42, for example, a medical optical fiber scope. A mechanism for adjusting the orientation angle of the object lens section 14 is provided at the distal end section 11, and the operation section is provided at the grip section 30, etc., for the optical fiber cable 12. Since the orientation angle of the objective lens section 14 can be adjusted even when the entirety is supported linearly, the coating with the flexible tube 42 is not required. It has a fiber 10 and it has an optical fiber 10 In addition to the wiring of the fiber, the one in which the light source device of the optical fiber for illumination is integrated with the gripping portion also has the fixed support member 40 and the telescopic support member 50 as described above. The same effect can be achieved by providing the same. This case differs from the embodiment of FIG. 1 in the following points. That is, a battery box and a light bulb that emits light by using a battery housed in the battery box as a power source are provided in the holding portion. The optical fiber for illumination has one end facing the electric bulb and the other end arranged near the object lens, and is wired to the optical fiber for inspection. It is covered with the same coating material as the inspection optical fiber. The light bulb is small and can emit strong light. For example, the above-mentioned “MAGLITE” may be used. Because it produces small and powerful light Light can be efficiently transmitted by the lighting optical fiber.

In the above embodiment, a dry battery is used as a power source. However, the same operation and effect can be obtained by using another storage battery, for example, a storage battery having a charging function. In addition, in place of the attachment 21 of the present embodiment, an inspection device in which a prism or a reflection mirror is attached is used (the other configuration is the same). The present invention can be applied. If a prism that bends light at right angles is used, it is possible to suitably inspect an object to be inspected in a direction (lateral) orthogonal to the optical axis of the objective lens. For example, it is effective when inspecting inside a pipe.

Further, the configuration including the fixed support member 40 and the telescopic support member 50 can be applied to an image processing apparatus using a CCD camera. In other words, referring to FIG. 1, an image introducing unit (CCD camera) that captures an image instead of the objective lens unit 14 and an image is displayed instead of the eyepiece lens unit 16 Instead of the image display unit (display, for example, a liquid crystal color display) and the optical fiber cable 12, one end is connected to the image introduction unit and the other end is connected to the image display unit. When the image processing apparatus includes an image transmission cable that can be bent together, the fixed support member 40 and the telescopic support member 50 operate in the same manner, and the same effect as in the above-described embodiment is obtained. Obtainable.

(Second embodiment)

In the first embodiment, the embodiment in which one telescopic support member 50 is provided for the fixed support member 40 has been described. However, as in the second embodiment shown in FIG. It is a matter of course that the elastic supporting members 50 may be provided in multiple stages. If the elastic supporting members 50 are provided in multiple stages, it is possible to obtain an inspection device using an optical fiber with good storability and portability.

(Third embodiment)

Curve the optical fiber cable 12 on the eyepiece lens side 1 As an example molded into 2a, there is one as shown in FIG. 6 (third example). The third embodiment is different from the first embodiment only in that the telescopic support member 50 is not provided, and the other configuration is provided in the same manner as the first embodiment.

(Fourth embodiment)

Further, as an embodiment in which the optical fiber cable 12 on the eyepiece lens side is formed into a curl cord-shaped portion 12a, there is an embodiment as shown in FIG. 7 (fourth embodiment). The fourth embodiment is different from the first embodiment in that the fixed support member 40 and the telescopic support member 50 are not provided, and the flexible tube 42 is not covered. The optical fiber cable 12 and the electric wire 24 on the objective lens side from the grip portion 30 are covered with a common covering material 36. This covering material 36 is formed of a material having high flexibility. Therefore, the distal end portion of the fourth embodiment can be suitably inserted into a complicated passage and can be suitably used when inspecting the inside.

In this way, the optical fiber cable 12 on the eyepiece lens side is molded into the call cord-shaped portion 12a, so that the optical fiber cable 12 is entangled. This can be prevented and expansion and contraction can be suitably performed. Therefore, for example, even if the eyepiece lens part 16 is fixed to the worker's head with a band or the like in contact with the eyes, the curl code-like part 12 follows the movement of the worker's head. Since a is preferably expanded and contracted, it is possible to work properly. By doing so, it becomes possible to perform inspection and other operations without having the eyepiece lens 16.

Although various preferred embodiments of the present invention have been described above, it should be understood that the present invention is not limited to the above-described embodiments, but may be further embodied without departing from the spirit of the invention. Of course, many modifications can be made.

Claims

An objective lens portion, an eyepiece lens portion, and one end optically connected to the objective lens portion, and the other end optically connected to the eyepiece lens portion and bent. An inspection apparatus using an optical fiber that is capable of visually inspecting an object to be inspected with an optical fiber cable provided so as to be capable of being inspected.

A grip portion is provided at an intermediate portion of the optical fiber cable, and the optical fiber cable between the grip portion and the eyepiece portion is formed in a helical shape. Inspection equipment using optical fiber. 2. The optical fiber according to claim 1, wherein the optical fiber cable is formed by arranging a large number of optical fiber single wires mainly composed of plastic in parallel. Inspection equipment. The optical fiber according to claim 1, wherein the objective lens portion and a small light bulb for illuminating an object to be inspected are provided integrally in parallel with a partition wall interposed therebetween. Inspection equipment using one. 4. The inspection device using an optical fiber according to claim 3, wherein the grip portion also serves as a battery box for storing a battery serving as a power source of the electric bulb. An electric wire connecting the light bulb and a power supply is wired along the optical fiber cable, and is covered with a coating material common to the optical fiber cable. An inspection device using the optical fiber according to claim 4.

A fixed support member for supporting the optical fiber cable in a predetermined section from the grip portion to the objective lens portion side; When the fiber cable is extended toward the one end side, a telescopic support member is provided for supporting the optical fiber cable portion corresponding to the extension so as not to bend. An inspection apparatus using the optical fiber according to claim 1, wherein the inspection apparatus is an optical fiber. The fixed support member and the telescopic support member are formed in a cylindrical shape, and the telescopic support member expands and contracts in a telescopic manner with respect to the fixed support member, and the optical fiber cable is fixed. 7. The inspection device using an optical fiber according to claim 6, wherein the inspection device is inserted into the support member and the telescopic support member. 2. The inspection apparatus using an optical fiber according to claim 1, wherein one end of the optical fiber cable is penetrated by and covered by a flexible tube.