JPH1049227A - Guide sensor for moving body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a guide sensor which never makes an inaccurate decision due to an increase in the quantity of photodetection of a photodetection part not right above a guide line by cutting off visible light which is made obliquely incident on the photodetection part from outside by respective light shield surfaces of a stop block and preventing a photodetecting element from receiving it. SOLUTION: Condenser lenses 62 and 62 are arranged on an optical axis B of photodetection which reaches a floor surface right below the photodetecting element 61 of the photodetection element 61, and the stop block 65 which has a light convergence hole 65b having cylindrical inner peripheral surfaces 65a... in four stages decreasing in internal diameter to the top is arranged between the condenser lenses 62 and 62 and photodetecting element 61. Annular light shield surfaces 65c along a plane crossing the optical axis B of photodetection at right angles are formed between the cylindrical inner peripheral surfaces 65a and 65a of the light convergence hole 65b and above the cylindrical inner peripheral surface 65a of the top stage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical system of a light receiving unit in a guide sensor of a moving body for guiding a moving body such as an automatic guided vehicle traveling on a floor along a guide line on the floor. Regarding the structure.

[0002]

2. Description of the Related Art A transport system for transporting goods by running an automatic guided vehicle along a guide line on a floor surface is known as a transport system.
It is widely used in facilities such as factories because it is easy to lay taxiways. FIG. 5 shows an example of an automatic guided vehicle used in such a transport system. The automatic guided vehicle 1 includes driving wheels 12 and 12 that are rotated by motors 11 and driven wheels 13 and 13 that are driven by the motors. The motors 11 and 11 are controlled to drive the left and right driving wheels 12 and 1.
By adjusting the rotation of No. 2, the vehicle travels while traveling straight on the floor A or turning left and right. In addition, guidance sensors 2 and 2 are attached to the front and rear lower parts of the automatic guided vehicle 1, respectively. Each guidance sensor 2 arranges, for example, 16 light receiving units side by side, and determines whether or not each of these light receiving units has received light from the guidance line 3, respectively.
The direction in which the automatic guided vehicle 1 is displaced from the guide line 3 is detected. Then, by controlling the rotation of the drive wheels 12, 12 according to the detection result, the automatic guided vehicle 1 can be guided along the guidance line 3.

[0003] Here, the guide line 3 is usually made of a guide material colored with a pigment having a color significantly different from the floor surface A,
Each light receiving portion of the guide sensor 2 can also receive only light of a specific color reflected by the guide line 3, and the light from the guide line 3 is reflected in accordance with the amount of light received by these light receiving portions. It is possible to determine whether or not light has been received.
However, such a guide line 3 has a very conspicuous color on the floor surface A, so that the aesthetic appearance may be impaired. Therefore, an invention has been proposed in which a transparent guide material that emits visible light due to a luminescence phenomenon when irradiated with ultraviolet rays is used for the guide line 3 so that the aesthetic appearance of the floor surface A is not impaired (Japanese Unexamined Patent Publication (Kokai) No. Heisei 9 (1999)). No. 6-149350). As described above, when a guide material that emits light whose wavelength range is completely different from that of incident light is used, light whose wavelength is completely different from the guide line 3 and all or a part of the wavelength of the incident light on the other floor A are used. Since the reflected light can be reliably distinguished from the reflected light and detected, there is also an advantage that it is less likely to be affected by noise due to external light and stains on the floor surface A.

When used for the guide line 3 that emits visible light upon irradiation with the ultraviolet light, the guide sensor 2 shields external light and irradiates the floor surface A with ultraviolet light from a black light or the like, as shown in FIG. Then, visible light from the floor surface A is received by the sixteen light receiving units 6 arranged above and below the floor surface A in the left-right direction (the direction orthogonal to the traveling direction). That is, for example, in the case shown in FIG. 6, only the central three light receiving portions 6 located directly above the guide line 3 receive visible light emitted from the guide line 3, and 13 light receiving portions on both sides thereof. The units 6 receive visible light from the floor surface A without the guide line 3. However, the light receiving sections 6 on both sides
.. Are exposed to only ultraviolet rays while being shielded from outside light, the ultraviolet rays are reflected, but the visible light is hardly reflected. Therefore, the central three light receiving portions 6... Sufficiently receive the visible light from the guide line 3 and the amount of received light increases, but the 13 light receiving portions 6.
The received light amount becomes extremely small, and it is possible to determine whether or not each light receiving unit 6 has received visible light from the guide line 3 based on the difference between these received light amounts.

[0005] Then, as shown in FIG.
3-4 light receiving sections 6 at the center of the two inductive sensors 2
Are determined to have a large amount of received light (in the figure, the light receiving units 6 having a large amount of received light are indicated by black circles), since the automatic guided vehicle 1 is along the guide line 3, the driving wheels 12, 12 Is rotated at the same rotational speed to go straight. However, for example, FIG.
As shown in the figure, the front guidance sensor 2 determines that only the three light receiving portions 6... Shifted to the left (downward in the figure) receive a large amount of light, and the rear guidance sensor 2 leans to the right (upward in the figure). If it is determined that only the light receiving amounts of the three light receiving units 6 are large, the unmanned transport vehicle 1 is inclined with respect to the guide line 3, so that the right driving wheel 12 is rotated more quickly. Steer to turn left. In this case, two guidance sensors 2 are mounted before and after the automatic guided vehicle 1. However, there is a case where only one guidance sensor 2 is used, and the number of the light receiving units 6 is not limited to 16. Absent. In addition, the driving method and the steering method of the automatic guided vehicle 1 are not limited to those using the left and right driving wheels 12, and there are various other methods.

[0006]

However, in order to sufficiently receive the visible light from the guide line 3, each light receiving section 6 of the guide sensor 2 has a light receiving element 61 as shown in FIG.
It is necessary to dispose the condensing lenses 62, 62 having a large aperture diameter below the cylindrical lens holder. Therefore, the cylindrical lens holder 64 holding the condensing lenses 62, 62 not only from the visible light directly below but also from the surroundings. Visible light enters obliquely into the inside. However, such visible light in the oblique direction is transmitted to the lens holder 6.
In many cases, the light is applied to the cylindrical inner peripheral surface of No. 4, and most of the light is absorbed by the inner peripheral surface. However, it is difficult to make the inner peripheral surface of the lens holder 64 a complete light absorbing surface, and a certain amount of reflection cannot be avoided from the viewpoint of manufacturing cost. Holder 64
The light proceeds to the inside of the inside and reaches the light receiving element 61 to be received. Therefore, for example, in the case shown in FIG. 6, the visible light from the guide line 3 is obliquely incident on some of the light receiving portions 6 on both sides adjacent to the central three light receiving portions 6 and receives light. The amount will increase.

For this reason, in the conventional guidance sensor 2, not only the light receiving portions 6 directly above the guide line 3 but also the light receiving amounts of the light receiving portions 6 adjacent on both sides thereof increase, and there is a possibility that the determination may be erroneous. Therefore, there has been a problem that the position detection of the automatic guided vehicle 1 with respect to the guide line 3 becomes ambiguous and accurate guidance cannot be performed.

[0008] The present invention has been made in view of such circumstances, and by disposing a diaphragm member having a plurality of light shielding surfaces whose inner diameter gradually decreases between a condenser lens and a light receiving element, It is an object of the present invention to provide a mobile object guidance sensor capable of blocking visible light that is obliquely incident on the light receiving unit from the outside and preventing inaccurate determination.

[0009]

In order to solve the above-mentioned problems, the present invention is directed to an induction sensor mounted on a moving body that runs on a floor on which a guide line that emits visible light when irradiated with ultraviolet rays is laid. There, while irradiating the floor surface with ultraviolet light, visible light from this floor surface is received by a plurality of light receiving units,
By distinguishing a light receiving unit that receives visible light from the guide line from a light receiving unit that does not receive the visible light, in the guidance sensor of the moving body that guides the moving body along the guidance line, from the floor surface to the light receiving element of the light receiving unit A condensing lens is arranged on the light receiving optical axis, and a light receiving optical axis along a plane substantially orthogonal to the light receiving optical axis is provided at a plurality of positions on the light receiving optical axis between the light receiving element and the light collecting lens. Aperture members are provided, each of which is provided with a light-shielding surface which is an annular surface having a center and whose inner diameter becomes smaller as approaching the light receiving element.

According to the means, when visible light is incident on the light receiving portion obliquely from the outside, the light is often irradiated on one of the light shielding surfaces of the diaphragm member. And, since these light shielding surfaces are along the surface almost perpendicular to the light receiving optical axis, even if the irradiated visible light cannot be absorbed enough and a part of it is reflected, this reflected light is collected. It can be returned to the lens side and can be prevented from being received by the light receiving element. Therefore, each light receiving unit receives only visible light incident along the light receiving optical axis, and increases the light receiving amount only when there is a guide line on the light receiving optical axis. Can be prevented.

Further, the aperture member makes the outer diameter of each light shielding surface equal to the inner diameter of another light shielding surface adjacent to the side farther from the light receiving element, and the outer diameter and the inner diameter of these light shielding surfaces. And an inner peripheral surface of the cylinder connected to the inner peripheral surface is provided.

According to the means, since the respective light shielding surfaces are connected by the inner peripheral surface of the cylinder, the aperture member can be easily formed integrally by resin molding or the like.

Further, the diaphragm member further includes a tapered inner peripheral surface which is connected to the inner diameter of the light shielding surface and whose diameter becomes larger as approaching the light receiving element, on the light shielding element side closest to the light receiving element. It is characterized in that it is.

According to the means, since the depth of the light shielding surface closest to the light receiving element is not the inner circumferential surface of the cylinder but the inner circumferential surface of the taper, the obliquely visible light passes through the inner diameter of the light shielding surface. In this case, there is no possibility that the light is reflected at the depth and is directly radiated to the light receiving element, so that the unnecessary light receiving amount can be further reduced.

Further, the above-mentioned diaphragm members are formed of black resin, and a grain is provided at least on the light shielding surface or the inner surface of the cylinder and the light shielding surface.

According to the means, the aperture member can be manufactured at a low cost by using a black resin, and the surface of the inner surface such as the inner peripheral surface of the cylinder or the inner peripheral surface of the taper is not limited to the light shielding surface. Is provided, unnecessary reflection of visible light on these surfaces can be suppressed.

Further, a band-pass filter is disposed between the aperture member and the light-receiving element, the band-pass filter passing only light in a visible light wavelength region generated when the guide line is irradiated with ultraviolet rays. And

According to the means, the bandpass filter (band-pass filter) selects only visible light in the wavelength region emitted when the guide line is irradiated with ultraviolet light, and the light receiving element receives the light. Also, when a light receiving element that receives visible light is used, it is possible to perform a reliable determination while avoiding the influence of external light and the like.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional side view showing a structure of an inductive sensor cut along a plane along a running direction, and FIG. FIG. 3 is a vertical cross-sectional side view showing the structure of the aperture block, and FIG. 4 is a vertical cross-sectional front view cut along a plane orthogonal to the traveling direction showing the light receiving state of each light receiving unit. is there. Components having the same functions as those of the conventional example shown in FIGS. 5 to 9 are denoted by the same reference numerals.

In this embodiment, an induction sensor 2 mounted on an automatic guided vehicle 1 as shown in FIG. 5 will be described. However, the present invention is not limited to such an automatic guided vehicle 1, and can be applied to an induction sensor provided on an arbitrary moving body traveling on the floor A. The guide line 3 laid on the floor A may be coated with a transparent guide material that emits visible light when irradiated with ultraviolet rays, or may be laid by other methods.

As shown in FIG. 1, the induction sensor 2
It comprises an ultraviolet irradiator 5, a light receiver 6, and a detection circuit 7 attached to the sensor box 4. The sensor box 4 is a frame made of aluminum and has an H-shaped vertical cross section that is long in the left-right direction (the front side and the back side in FIG. 1), and the ultraviolet irradiation unit 5 is disposed behind the lower side (the right side in FIG. 1). At the same time, the light receiving section 6 is arranged in front of the light receiving section (the left side in FIG. 1), and the detection circuit section 7 is arranged on the upper side. The guidance sensor 2 of the present embodiment is unitized in the sensor box 4 for maintenance or the like, and is slidably mounted on the automatic guided vehicle 1.

The ultraviolet irradiation section 5 is composed of a black light 51 and a reflection plate 52. Black light 51
Is a discharge tube that is long in the left-right direction, and serves as a light source that emits ultraviolet light. The reflecting plate 52 is a curved plate long in the left-right direction and has a vertical cross-section in which aluminum is vapor-deposited on an inner surface and a part of an elliptical shape, and is attached so as to cover above and behind the black light 51. Therefore, black light 5
The ultraviolet light emitted from 1 is directly or reflected by the reflection plate 52 and radiated to the floor A below.

The light receiving section 6 includes a light receiving element 61 and two condensing lenses 62, 62 arranged on a light receiving optical axis B extending from the light receiving element 61 to a floor surface A directly below. The condenser lenses 62, 62 are two convex lenses having a large opening diameter which are arranged to face each other, so that light from the floor surface A is efficiently condensed on the light receiving surface of the light receiving element 61.
As shown in FIG. 2, these condenser lenses 62, 62
It is arranged to face each other via a lens holding pipe 63, and is inserted into the upper part of the light receiving hole 64 a of the lens holder 64. The light receiving hole 64a of the lens holder 64 is formed of a three-stage cylindrical inner peripheral surface whose inner diameter becomes smaller toward the lower side, and these condenser lenses 62, 62 are inserted into the innermost surface of the uppermost stage to receive the light receiving optical axis. B.

An aperture block 65 is disposed on the lens holder 64. As shown in FIG. 3, the aperture block 65 has a light-collecting hole 65b having four steps of cylindrical inner peripheral surfaces 65a... Further, each cylindrical inner peripheral surface 65 of the light collecting hole 65b
a, 65a and above the uppermost cylindrical inner peripheral surface 65a, an annular light shielding surface 65c centered on the light receiving optical axis B is formed along a plane orthogonal to the light receiving optical axis B. . Therefore, these light shielding surfaces 65c have the outer diameter equal to the inner diameter of the cylindrical inner peripheral surface 65a adjacent below and the inner diameter equal to the inner diameter of the cylindrical inner peripheral surface 65a adjacent upward. The inner diameters of the light shielding surfaces 65c are smaller as they go upward. However, above the uppermost light shielding surface 65c, not the cylindrical inner peripheral surface 65a, but a tapered inner peripheral surface 65d whose inner diameter becomes larger upward is formed, and the tapered inner peripheral surface 65d is formed.
The upper part of the upper end of the aperture is opened to the upper surface of the aperture block 65.
The inner diameter of the uppermost light shielding surface 65c is slightly larger than the light receiving surface of the light receiving element 61 as shown in FIG. Further, the innermost peripheral surface 65a of the lowermost cylinder of the light collecting hole 65b.
Is slightly smaller than the diameter of the condenser lenses 62, 62, so that when the stop block 65 is placed on the lens holder 64, these condenser lenses 62, 62
62 can be prevented from falling off.

The aperture block 65 is integrally formed of a black resin molded product. In addition, the surface of the cylindrical inner peripheral surface 65a... And the light shielding surfaces 65c. Accordingly, when these cylindrical inner peripheral surfaces 65a and the light shielding surfaces 65c are irradiated with visible light, most of them are absorbed by the black resin grain and the reflected light can be scattered to some extent. By using such a black resin molded product, the aperture block 65 can be manufactured at low cost. In addition, the grain can be integrally processed during molding.

As shown in FIG. 2, a filter cap plate 67 is placed on the stop block 65 via a band pass filter 66 mounted on the upper end opening of the light collecting hole 65b.
Is arranged. The band-pass filter 66 is a band-pass filter that passes only visible light in a predetermined wavelength region emitted when the guide line 3 is irradiated with ultraviolet light from the black light 51 of the ultraviolet light irradiation unit 5. The filter cap plate 67 has a through hole formed on the light receiving optical axis B so that the light receiving element 61 can be inserted therein.

As shown in FIG. 1, the lens holder 6
The aperture block 65 disposed on the upper side 4 inserts the upper end from below into a through hole formed in a plate-like portion that partitions the upper and lower sides of the sensor box 4. The filter cap plate 6
7 is mounted on the aperture block 65 from above the plate-like portion of the sensor box 4. The filter cap plate 67, the aperture block 65, and the lens holder 64 are fixed to the sensor box 4 by screwing a set screw from above the filter cap plate 67. Therefore, the light from the floor A passes through the lens holder 64 in the upper light receiving section 6 and the condensing lenses 62, 62.
Then, only visible light in a predetermined wavelength region is transmitted by the bandpass filter 66 through the aperture block 65 and received by the light receiving surface of the light receiving element 61.

Sixteen light receiving parts 6 are attached at equal intervals in the left-right direction of the sensor box 4. The detection circuit section 7 is constituted by an electric circuit 72 on a substrate 71 attached to the upper side of the sensor box 4, and the electric circuit 72 is connected to the light receiving element 61 of the light receiving section 6 to perform processing such as determination of the amount of received light. I do. In addition, a protective glass 8 is fitted to the lower end of the sensor box 4 to prevent the ultraviolet irradiation unit 5 and the light receiving unit 6 from dust. This protective glass 8
A material that can sufficiently transmit ultraviolet light in addition to visible light is used. Further, light-shielding rubber curtains 9, 9 reaching the lower floor A are attached to the lower part of the front and rear of the sensor box 4 so as to shield the space reaching the floor A below the sensor box 4 from external light. It has become.

As shown in FIG. 1, the induction sensor 2 having the above-described structure irradiates the floor surface A between the lower light-shielding rubber curtains 9, 9 with the ultraviolet light from the black light 51 of the ultraviolet irradiation section 5. Further, the visible light from the floor surface A is received by the light receiving element 61 of the upper light receiving unit 6. At this time, as shown in FIG. 4, the light receiving units 6 arranged on the left and right (only three light receiving units 6 are shown in FIG. 4) are respectively visible in a predetermined wavelength region from the floor A almost directly below. Since only light is received, the light receiving section 6 directly above the guide line 3 (the light receiving section 6 on the right side in FIG. 4)
Indicates that the light receiving amount of the light receiving element 61 is large, and the light receiving portion 6 directly above the floor surface A where the guide line 3 is not provided (the light receiving portions 6 and 6 at the center and the left side in FIG. Become.

Also, light is emitted from the guide line 3 into the light receiving holes 64a of the lens holders 64 of the light receiving portions 6 slightly deviated from directly above the guide line 3 (the light receiving portions 6 and 6 at the center and the left side in FIG. 4). The obtained visible light may be obliquely incident (for example, visible light C and D shown in FIG. 4). However, since these visible lights C and D are not along the light receiving optical axis B, a part thereof is reflected directly or on the inner peripheral surface of the light receiving hole 64a and the like, and the light is reflected on the light shielding surface 65c of the aperture block 65. Irradiation increases. Then, such visible lights C and D pass through the light shielding surface 6.
5c is partially reflected in addition to being absorbed by the light shielding surface 6c.
Since 5c is a surface orthogonal to the light receiving optical axis B, the reflected light here is scattered downward so as to return to the incident direction. Moreover, even when such visible light is applied to the inner peripheral surface 65a of the cylinder without being applied to the light shielding surface 65c of the stop block 65, the reflected light is reflected by the light shielding surface 65c immediately above.
In many cases, the light is scattered downward. However, the uppermost light shielding surface 65c
If there is a cylindrical inner peripheral surface 65a above the light, the reflected light of the visible light applied to the cylindrical inner peripheral surface 65a
1 light receiving surface. However, in the inductive sensor 2 of the present embodiment, the tapered inner peripheral surface 65d is formed above the uppermost light shielding surface 65c. Without being directly reached, the light is absorbed while the reflection is repeated on the side and the like.

Therefore, the light receiving sections 6 close to the guide line 3.
Is that even if the visible light from the guide line 3 is obliquely incident, most of the light is blocked from the light shielding surface 65c of the aperture block 65.
And the light is reflected back here and returned downward, so that the amount of light received by the light receiving element 61 does not needlessly increase. Thus, the possibility that the light receiving units 6 that are not located directly above the guide line 3 make an erroneous determination is reduced.

In the present embodiment, the tapered inner peripheral surface 65d is formed above the uppermost light shielding surface 65c in the stop block 65 of the light receiving unit 6, but if visible light incident here can be ignored. A cylindrical inner peripheral surface 65a similar to that between the light shielding surfaces 65c may be formed. In the present embodiment, the respective light shielding surfaces 65c are connected by the cylindrical inner peripheral surface 65a as described above. However, a tapered inner peripheral surface 65d is also formed here, and in addition, for example, an annular deep groove shape It can also be.

Further, in this embodiment, the aperture block 6
Although a molded product of a black resin was used for 5, any other material that can absorb visible light to some extent and suppress reflection may be used.

In this embodiment, the band-pass filter 66 is used to make the light receiving element 61 receive only visible light in a predetermined wavelength range. However, other optical parts may be used, or the light receiving element 61 itself may be used. Those having sensitivity only to visible light in a predetermined wavelength range may be used.

[0036]

As is clear from the above description, according to the moving object guidance sensor of the present invention, unnecessary visible light incident from an oblique direction is reflected by each light shielding surface of the diaphragm member and is reflected in the incident direction. Since the return is performed, it is possible to prevent the light receiving element of the light receiving unit that is not on the guide line from receiving the unnecessary visible light and making the determination inaccurate.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing an embodiment of the present invention and showing a structure of an inductive sensor cut along a plane along a traveling direction.

FIG. 2, showing an embodiment of the present invention, is an assembled partial vertical cross-sectional perspective view illustrating a structure of a light receiving unit.

FIG. 3, showing an embodiment of the present invention, is a longitudinal sectional side view illustrating a structure of an aperture block.

FIG. 4 shows one embodiment of the present invention, and is a longitudinal sectional front view taken along a plane perpendicular to the traveling direction, showing a light receiving state of each light receiving unit.

FIG. 5 is a perspective view showing the structure of the automatic guided vehicle.

FIG. 6 is a front view showing a light receiving state of 16 light receiving units arranged side by side in the induction sensor.

FIG. 7 is a plan view showing a state of each light receiving unit of the guidance sensor when the automatic guided vehicle travels straight.

FIG. 8 is a plan view illustrating a state of each light receiving unit of the guidance sensor when the automatic guided vehicle turns right.

FIG. 9 is a longitudinal sectional front view showing a conventional example and showing a light receiving state of a light receiving section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Unmanned guided vehicle 2 Guidance sensor 3 Guidance line 6 Light receiving part 61 Light receiving element 62 Condensing lens 65 Aperture block 65a Cylindrical inner peripheral surface 65c Light shielding surface 65d Tapered inner peripheral surface 66 Bandpass filter

Claims (5)

[Claims] An inductive sensor mounted on a moving body that runs on a floor on which a guide line that emits visible light when illuminated with ultraviolet light is provided. The inductive sensor irradiates the floor with ultraviolet light and emits visible light from the floor. By receiving light with a plurality of light receiving units and determining a light receiving unit that receives visible light from the guide line and a light receiving unit that does not receive the visible light, a guidance sensor of the moving body that guides the moving body along the guidance line, A condensing lens is arranged on the light receiving optical axis extending from the floor surface to the light receiving element of the light receiving section, and is substantially orthogonal to the light receiving optical axis at a plurality of positions on the light receiving optical axis between the light receiving element and the light collecting lens. A movable surface, wherein aperture members each having a light shielding surface which is an annular surface substantially centered on a light receiving optical axis along a surface to be provided and whose inner diameter decreases as approaching the light receiving element are arranged. Inductive sensor. 2. The diaphragm member, wherein the outer diameter of each light shielding surface is equal to the inner diameter of another light shielding surface adjacent to a side farther from the light receiving element, and the outer diameter and inner diameter of these light shielding surfaces are equal to each other. 2. The moving body guidance sensor according to claim 1, further comprising a cylindrical inner peripheral surface connected to the moving body. 3. The diaphragm member further includes a tapered inner peripheral surface connected to an inner diameter of the light shielding surface and having a diameter that increases as the distance from the light shielding surface increases, further on the light shielding surface closest to the light receiving element. The mobile object guidance sensor according to claim 1 or 2, wherein: 4. The aperture member according to claim 1, wherein the aperture member is formed of a black resin, and a grain is provided on at least the light shielding surface or the light shielding surface and the inner peripheral surface of the cylinder. 2. The inductive sensor for a moving object according to claim 1. 5. A band-pass filter is provided between the aperture member and the light receiving element, the band-pass filter passing only light in a visible light wavelength region emitted when the guide line is irradiated with ultraviolet light. An inductive sensor for a moving body according to claim 1.