Passage detection system and pest repellent system

Abstract

To provide a passage detection system and a pest repellent system that can reliably detect the passage of an object and can detect a wide area with a small number of devices. [Solution] A passage detection system 100 is provided using a plurality of light-emitting and receiving devices 100·100'… for detecting an object O passing by using light, wherein each light-emitting and receiving device 100 comprises a light-emitting unit 2 that emits detection light L, a light-receiving unit 3 that receives the detection light L, and a control unit 4 that emits a predetermined signal according to the light-receiving intensity of the light-receiving unit 3, wherein the light-receiving unit 3 in any light-emitting and receiving device 100 is configured to receive detection light L emitted by the light-emitting unit 2 in an adjacent light-emitting and receiving device 100', and when the light-receiving intensity of the light-receiving unit 2 of any light-emitting and receiving device reaches a predetermined threshold, the control unit 4 of the light-emitting and receiving device 100 equipped with the light-receiving unit 2 that reached that threshold emits a predetermined signal S.

Description

Technical Field

[0001] The present invention relates to a passage detection system that uses light to detect that an object has passed through the boundary of a predetermined area, and a pest repellent device that can use the system to drive away harmful birds and beasts.

Background Art

[0002] Conventionally, technologies have been developed for detecting that an unintended object or organism has entered a predetermined area or passed through the boundary of the area. In particular, active efforts have been made to develop technologies for driving away birds and beasts that damage fields and preventing them from entering the fields.

[0003] Among these technologies, many have been developed that use light in consideration of the detection speed and the impact on the objects and organisms to be detected. For example, there is a device that monitors the received light intensity of the irradiated light and employs a mechanism that utilizes the fact that the received light intensity decreases when the light is blocked. [[ID=十七]]<0000の013>

[0004] As a specific conventional example of the above technology, there is an example that employs a configuration in which infrared light emitted from a projector is received by a light receiver. Patent Document 1 discloses a technology for a pest repellent device in which a pair of detection sensors, an infrared projector and a light receiver, are arranged so as to be able to monitor a predetermined area without gaps. In this device, when the intrusion of a pest is detected by the detection sensor, it is said that a laser beam or a flash can be emitted from a light emitting device toward the vicinity of the pest's eyeball to intimidate the pest based on the position of the pest. <の

[0005] Since light has high rectilinearity, it can reach a long distance, enabling detection of passage at a distant position, and passage detection by blocking is easy. On the other hand, in order to widen the detection range, it is necessary to optically diffuse the light or expand the irradiation range using many light sources.

[0006] Patent Document 2 discloses a technology that connects multiple main units equipped with an infrared-based pest detection sensor, a speaker, and a solar panel, sensor units equipped only with a pest detection sensor, and speaker units equipped with a pest detection sensor and a speaker, using cables. It is stated that this configuration can expand the detection range of pests attempting to invade fields, farms, etc. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Utility Model Registration No. 3187091 Gazette [Patent Document 2] Japanese Patent Publication No. 2020-195339 [Overview of the project] [Problems that the invention aims to solve]

[0008] The pest repellent device technology disclosed in Patent Document 1 is described as detecting the intrusion of pests with a detection sensor and then measuring the pests' location. However, in order to expand the detectable monitoring range, it is necessary to place multiple detection sensors at predetermined intervals. Therefore, monitoring a wide area requires preparing many detection sensors, which poses a significant cost problem.

[0009] Generally, the more concentrated light is, the higher its radiant intensity becomes, allowing it to illuminate distant areas even with scattering and absorption by the air. On the other hand, diffusing light allows it to illuminate a wide area, but the radiant intensity decreases, and the effects of scattering and absorption become greater, so it can only illuminate nearby areas. Although Patent Document 1 does not mention the optical characteristics of the infrared illuminator of the detection sensor, when used in a focused manner, the radiation angle is narrow, so many detection sensors must be placed at close intervals. Conversely, when used in a diffused manner, the light does not reach far, so detection sensors facing each other must be placed close together. In any case, there is the problem of having to deploy a large number of detection sensors.

[0010] In the technology described in Patent Document 2, power can be supplied from the main unit to each unit by connecting the main unit, sensor unit, and speaker unit in series with a cable. By enclosing a predetermined area with the cable, the pest detection sensors are placed at predetermined intervals, thus expanding the area that can be monitored.

[0011] However, since the pest detection sensors are facing inward, it is thought that there are similar problems with the light irradiation range as in Patent Document 1. Therefore, when using focused light, a large number of pest detection sensors must be placed at close intervals, and when using diffused light, opposing pest detection sensors must be placed close together. Therefore, attempting to monitor a wide area can lead to a similar problem: it requires preparing many pest detection sensors, which can be very expensive.

[0012] Thus, with conventional technology, monitoring a wide area required deploying many sensors, which presented problems in terms of the effort and cost involved in installation.

[0013] This invention has been made in view of the above-mentioned problems, and its objective is to provide a passage detection system and a pest repellent system that can reliably detect the passage of an object and can detect a wide area with a small number of devices. [Means for solving the problem]

[0014] The means employed by the inventors to solve the above problems are described below. The passage detection system of the present invention is a passage detection system that uses a plurality of light-emitting and light-receiving devices for detecting objects passing by using light. The light-emitting and light-receiving device comprises a light-emitting unit that emits detection light, a light-receiving unit that receives the detection light, and a control unit that emits a predetermined signal according to the light-receiving intensity of the light-receiving unit. The light-receiving unit of any light-transmitting device is configured to receive detection light emitted by the light-emitting unit of an adjacent light-transmitting device. Furthermore, when the light-receiving intensity of the light-receiving unit of any light-transmitting device reaches a predetermined threshold, the control unit of the light-transmitting device having the light-receiving unit that reached that threshold is configured to emit a predetermined signal.

[0015] In this invention, when the light intensity of the light receiving unit rises or falls to a predetermined threshold due to the passage of an object or living organism, the control unit emits various signals, such as audio signals or optical signals, as needed. This allows for notification of the passage of an object or transmission of an alarm to living organisms. In addition to these direct signals, the signals emitted by this control unit also include electrical signals to transmit the fact that an object has passed to other devices. Furthermore, by configuring the device to be able to receive detection light emitted by the light-emitting section of an adjacent light-emitting / receiving device, multiple light-emitting / receiving devices located far apart can be connected via detection light.

[0016] In order to solve the aforementioned problems, the present invention also employs, in addition to the above-mentioned means, a configuration comprising a terminal light-emitting device having a light-emitting unit that emits detection light and not having a light-receiving unit that receives detection light, a terminal light-receiving device having a light-receiving unit and not having a light-emitting unit that emits detection light, and a plurality of such light-emitting and light-receiving devices. The light-emitting section of the terminal light-emitting device emits detection light to the light-receiving section of any adjacent light-emitting / receiving device, while the light-receiving section of the terminal light-receiving device is positioned to receive the detection light emitted by the light-emitting section of any adjacent light-emitting / receiving device.

[0017] In the above configuration, when it is desired to monitor an open range between arbitrary locations, by adopting a configuration including a terminal light emitting device and a terminal light receiving device, at one terminal portion, light emission can be performed, and at the other terminal portion, light reception can be performed. Therefore, the open range can be monitored.

[0018] As another means adopted by the present invention to solve the above problems, it is also possible to be composed only of a plurality of the light transmitting and receiving devices, and each of all the light transmitting and receiving devices is arranged so as to emit detection light to an adjacent light transmitting and receiving device and receive the detection light emitted by another adjacent light transmitting and receiving device.

[0019] In the above configuration, when it is desired to monitor a specific range as a closed range, by being composed only of a light transmitting and receiving device that emits detection light by itself and receives the detection light from another adjacent light transmitting and receiving device, any light transmitting and receiving device emits detection light to an adjacent light transmitting and receiving device and receives the detection light from another adjacent light transmitting and receiving device. Therefore, the closed range can be monitored.

[0020] As another means adopted by the present invention to solve the above problems, it is also possible to configure the light transmitting and receiving device as a pile-shaped device so that the tip of the pile-shaped device can be pierced into the ground. In this configuration, an operation portion that performs a predetermined operation in response to a signal from the control portion is provided at the head portion of the pile shape, and the light transmitting portion and the light receiving portion are provided between the tip portion and the head portion.

[0021] By making the light transmitting and receiving device pile-shaped, it can be easily installed by piercing into the soil. Further, by providing an operation portion at the head portion, various operations can be performed, such as an operation of emitting light or sound, a water discharge operation, and an operation in which the operation portion itself rotates or swings, in response to a signal issued from the control portion.

[0022] In the above configuration, it is also possible to configure either or both of the light transmitting portion and the light receiving portion so that the direction of light transmission and reception of the detection light can be adjusted. By making it possible to adjust the direction of light emission and light reception of the detection light, after installing the light emission and light reception device, it is possible to finely adjust the direction with respect to an adjacent light emission and light reception device, and the detection light emitted from the light emission unit can be reliably received by the light reception unit.

[0023] Also, in the above configuration, it is also possible to configure the light receiving unit to be capable of receiving detection light from any direction with respect to the horizontal direction. With this configuration, no matter from which direction the detection light from an adjacent light emission and light reception device is emitted with respect to the horizontal direction, the light receiving unit can receive detection light from any direction. Therefore, there is no need to finely adjust the directions of adjacent light emission and light reception devices.

[0024] As another means adopted by the present invention to solve the above problems, it is also possible to use the above-described passage detection system as a pest repellent system for driving away passing animals. When an animal passes through so as to block the detection light irradiated between adjacent light emission and light reception devices, the control unit issues a predetermined signal, so that the animal startled by the signal can be driven out of a predetermined monitoring range.

[0025] In the above configuration, it is also possible to configure the light emission unit to emit a plurality of detection lights. For example, if only detection light is emitted at a low position, it is possible to detect the passage of small animals, but there is a risk that large animals will straddle over the detection light. Conversely, if detection light is only emitted at a high position, there is a risk that small animals will pass under the detection light. Also, if there is only one detection light, depending on the behavior of the object, there is a risk that the object will accidentally avoid the detection light and pass through. With the above configuration, by emitting a plurality of detection lights, it is possible to reliably detect passage regardless of the size and behavior of the object.

[0026] In the above configuration, the light-emitting unit can be configured to selectively emit any detection light from among a plurality of detection lights. Selectively means selecting a detection light by manually switching between them, or electronically and automatically selecting and emitting different detection lights in a periodic switching manner. By selectively emitting a detection light from among multiple detection lights, it is possible to distinguish between target and non-target objects according to the settings. Furthermore, the desired detection height can be adjusted depending on the location. Additionally, by selectively emitting detection lights at specific heights as needed, rather than simultaneously emitting lights at multiple heights, current consumption can be reduced.

[0027] In the above configuration, it is also possible to further include an electric fence and configure it so that the power to operate the light-emitting and receiving device is obtained from the electric fence while it is energized or from the power supply of the electric fence. When an electric fence is installed to prevent damage from wild animals, the power from that fence can be used to operate the pest repellent system of the present invention, eliminating the need to prepare a separate power source for the pest repellent system. [Effects of the Invention]

[0028] The present invention's passage detection system and pest repellent system use multiple light-emitting and light-receiving devices to create a state where detection light is irradiated between the light-emitting unit and the light-receiving unit, thereby reliably detecting when an object has passed through while blocking the detection light. Furthermore, by configuring the light-receiving unit to receive detection light emitted by adjacent light-emitting and light-receiving devices, the devices can be installed at wide intervals, allowing a wide area to be monitored with fewer devices. This allows for reliable detection of the passage of objects and enables detection over a wide area with a small number of devices. [Brief explanation of the drawing]

[0029] [Figure 1] This is an explanatory diagram illustrating the configuration of the passage detection system of the present invention. [Figure 2] This is a cross-sectional view showing the configuration of the light-emitting and receiving device of the present invention. [Figure 3] This is an explanatory diagram illustrating the mechanism by which the passage detection system of the present invention detects the passage of an object. [Figure 4] This is an explanatory diagram illustrating a pest repellent system using the passage detection system of the present invention. [Figure 5] This is a flowchart illustrating the operation of the pest repellent system of the present invention. [Figure 6] This is a front view showing a modified example 1 of the present invention. [Figure 7] This is a front view showing a modified example 2 of the present invention. [Figure 8] This is a front view showing a modified example 3 of the present invention. [Modes for carrying out the invention]

[0030] Embodiments for carrying out the present invention will be described below with reference to Figures 1 to 5. Note that each figure is schematically represented for explanatory purposes, and dimensions and shapes are partially exaggerated or simplified. For example, the detected light L is represented as a single line or a band of a predetermined width for illustrative purposes.

[0031] [Configuration of the passage detection system] As shown in Figure 1, the passage detection system 1000 of the present invention is configured using multiple light-emitting and receiving devices 100·100'… for detecting the passage of an object O using light. In the configuration shown in Figure 1, three light-emitting and receiving devices 100·100'·100'' are arranged to form a triangular monitoring area. Note that the object O is not limited to an object, but may also be a living organism such as a person or an animal.

[0032] The passage detection system 1000 can detect by light when an object O passes between any two light-emitting / receiving devices 100·100'…. When monitoring the passage of an object O, one light-emitting / receiving device 100 emits detection light L, and the other light-emitting / receiving device 100' receives this detection light L. In this state, when an object O passes between the light-emitting / receiving devices 100·100', the detection light L is blocked during the passage, and the other light-emitting / receiving device 100' does not receive the detection light L. By detecting this blocked state, the passage of the object O can be detected.

[0033] Adjacent light-emitting and receiving devices 100·100'… are optically connected by detection light L·L…. In other words, if the detection light L is a linear laser as shown in Figure 1, it is projected in a wire-like manner between adjacent light-emitting and receiving devices 100·100'…, and multiple light-emitting and receiving devices 100·100'… arranged in series are connected by the detection light L. In addition to lasers as shown in Figure 1, the detection light L can also be projected in a diffused band shape. This makes it possible to enclose a predetermined area as a closed region or to project an open region using the detection light L.

[0034] [About the light-emitting / receiving device] As shown in Figure 2, the light-emitting and receiving device 100 of the present invention comprises a light-emitting unit 2 for emitting infrared detection light L onto a stake-shaped support column 1, a light-receiving unit 3 for receiving detection light L emitted from an adjacent light-emitting and receiving device 100', a control unit that emits an electrical signal according to the light-receiving intensity of the light-receiving unit 3, and an operating unit 5 that emits a light-based intimidation signal in response to the electrical signal emitted by the control unit 4. In the configuration shown in Figure 2, it can be installed by being driven into the ground like a stake.

[0035] The support column 1 can be made from various materials, but for example, it can be constructed by attaching a stainless steel conical tip 12 to a plastic cylindrical body 11. By making the cylindrical body 11, which is the main body of the support column, it is possible to reduce the weight and make it easier to form structures such as the light-emitting part 2 and the light-receiving part 3 inside. In addition, by making the tip 12 a stainless steel cone, it is easy to insert into the ground, is resistant to corrosion, and is less likely to break even when strong force is applied.

[0036] The light-emitting unit 2 has a laser module 21 inside, and a circular light-emitting cover 22 is provided in front of it. The laser module 21 is a semiconductor laser that emits near-infrared light with a wavelength of, for example, 850 nm to 1000 nm, and has a predetermined beam divergence angle. The laser wavelength can be infrared light closer to longer wavelengths or visible light wavelengths, but since it will be used outdoors, it is desirable to select a wavelength that is less affected by the wavelength of sunlight.

[0037] In addition to semiconductor lasers, other types of lasers such as YEG lasers and fiber lasers can be used. Furthermore, for short-range applications, LEDs (Light Emitting Diodes) and other light sources can also be used.

[0038] Various optical adjustments and emission patterns can be employed for the laser. In this invention, the infrared laser emitted by the laser module 21 is made into parallel light by the collimator lens 23. This allows for irradiation over long distances while maintaining a constant radiation intensity. Furthermore, the laser emission pattern is a signal modulated by PWM (Pulse Width Modulation), making it easier to separate from noise components caused by sunlight.

[0039] The light-emitting cover 22 is a plastic window with light-transmitting properties that do not block the infrared light being emitted. Furthermore, it is desirable that it have light-transmitting properties that block the wavelength components of visible light in order to prevent visibility into the interior.

[0040] The light-receiving unit 3 has a light-receiving element 31 inside, and a cylindrical light-receiving cover 32, which is like a part of the support column 1 separated, is provided around it. The light-receiving element 31 can be, for example, a PD (Photo Diode), a PT (Photo Transistor), a CCD (Charge Coupled Device), etc. Furthermore, although only one light-receiving element 31 is shown in Figure 2, multiple light-receiving elements 31·31… can be arranged in different orientations to receive detection light L from various directions in the circumferential direction.

[0041] The light-receiving cover 32 is a cylindrical plastic body with light-transmitting properties that do not block the infrared light to be received. Furthermore, in order to prevent the inside from being seen and to reduce the influence of external noise components such as sunlight, it is desirable to have light-transmitting properties that block the wavelength components of visible light.

[0042] The control unit 4 is located inside the support column 1 and consists of an electrical circuit board that includes a control device such as a microcontroller. As shown in Figure 3, the control unit 4 emits a signal S when the light reception intensity of the detected light L in the light receiving unit 3 decreases. When an object O passes through the detected light L, the light reception sensitivity decreases in a short time. When this light reception sensitivity falls below a predetermined threshold, the control unit 4 emits a signal S. In the configuration shown in Figure 2, for example, the device is configured to emit an electrical signal to the operating unit 5, but it may also emit signals such as electrical signals or radio waves to devices other than the light transmitter / receiver 100. Furthermore, the control unit 4 may directly emit a warning signal to animals.

[0043] The signal S emitted by the control unit 4 determines that an object O has passed when the light reception intensity of the light receiving unit 3 decreases from a high state to a low state, and emits a signal S to the operation unit 5 to perform a deterrent action against the animal. Also, when the light reception intensity of the light receiving unit 3 increases from a low state to a high state, it determines that the animal has moved away from the boundary of the monitoring range, and emits a signal S to the operation unit 5 to stop the deterrent action after a certain period of time. In addition to the above, the control unit 4 can also perform other actions, such as switching to an initial setup mode to adjust the relative positions of adjacent light-emitting and receiving devices 100·100' during initial installation.

[0044] The operating unit 5 is located at the top of the support column 1 and is configured to emit light to intimidate animals. The operating unit 5 receives a signal S from the control unit 4 and can emit a strong flash of light into the surrounding area, but the light intensity, emission pattern, and emission color can be selected as appropriate.

[0045] In addition to emitting a flash of light, the operation of the operating unit 5 can also employ laser light, a rotating light, or other means. Furthermore, it can perform actions other than light, such as emitting audible sounds or ultrasonic sounds, emitting odors that animals dislike, or spraying water. Although not shown in the diagram, a lithium-ion secondary battery may be incorporated as a power source, and it may be charged using electricity generated by a solar panel, or a plug or cable may be provided for receiving power from an external source.

[0046] In the present invention, if a separate device is configured to operate in response to a signal S from the control unit 4, the light-emitting / receiving device 100 may be configured without an operating unit 5. In this case, the pile-shaped head that will become the operating part 5 can also be fitted with a cap member that does not have any particular function.

[0047] The mechanism for detecting the passage of animals in the pest repellent system 2000 using such a passage detection system 1000 will be explained with reference to Figures 4 and 5. For the purpose of this explanation, two light-emitting and receiving devices 100 and 100' will be described below. First, as shown in Figure 4, two light-emitting and receiving devices 100·100' are installed by sticking them into the ground at a certain distance apart. Next, the power is turned on, and the angle of the support column 1 is adjusted so that the light-emitting section 2 of one light-emitting / receiving device 100 faces the light-receiving section 3 of the other light-emitting / receiving device 100'.

[0048] At this time, the light-emitting and receiving device 100·100' of the present invention is set to initial setting mode (see Figure 5). In initial setting mode, the light-emitting unit 2 continuously emits detection light L. Simultaneously, when the light-receiving unit 3 receives the detection light L, an LED (not shown) provided near the light-receiving unit 3 is lit to indicate that the light-receiving unit 3 has been positioned to receive the detection light L.

[0049] Thus, in the initial setting mode, when the light receiving unit 3 receives the detection light L, the light reception status can be determined by an LED indicator rather than a warning signal. This means that the installer will not be exposed to loud noises or bright lights at close range during installation, reducing the burden on the installer. In addition, in the initial setting mode, a visible light detection light L may be irradiated onto the light receiving unit 3, and it may be visually confirmed whether the detection light L is being irradiated onto the light receiving unit 3.

[0050] Once the installation of the light-emitting and light-receiving devices 100 and 100' is complete, the system is switched to monitoring mode (see Figure 5) and placed in monitoring mode. In monitoring mode, the light-receiving unit 3 of the adjacent light-emitting device 100' is constantly receiving the detection light L emitted from the light-emitting unit 2 of one of the light-emitting and light-receiving devices 100. At this time, the control unit 4 considers the system to be in a non-pass-through state and does not emit any signal S to the operating unit 5.

[0051] Here, when the object O (in this case, an animal) passes between the light-emitting and receiving devices 100 and 100', the detection light L is blocked by the animal. At this time, the light-receiving unit 3 of the other light-emitting and receiving device 100' does not receive the detection light L, so the control unit 4 sends a signal S to the operating unit 5 to issue a warning signal. However, the detection light L may be momentarily blocked by foreign objects or other factors. To prevent such false detections, it is advisable to emit a signal S if the decrease in light reception intensity continues for a certain period of time.

[0052] Upon receiving a signal S for emitting a warning signal, the operating unit 5 intimidates the animal attempting to pass by, for example, emitting a strong flash of light. The intimidated animal is then driven out of the monitoring range. When an animal releases the blockage of the detection light L, that is, when it moves out of the monitoring range, the light intensity of the other light transmitter / receiver 100' increases again. Once the light intensity returns to a high value, the system returns to monitoring mode after a certain period of time for hysteresis. Then, it resumes monitoring for the passage of animals.

[0053] The passage detection system 1000 in Figure 1 and the pest repellent system 2000 in Figure 4 can detect the passage of an object O into a closed area by using multiple light-emitting and receiving devices 100, 100, etc. Furthermore, to expand the monitoring range, it is only necessary to widen the spacing between adjacent light-emitting and receiving devices 100, 100', and the monitoring range can be expanded without increasing the number of devices.

[0054] "Differentiation Example 1" The present invention is not limited to the above-described embodiments, and other embodiments may be adopted. Parts common to the embodiments in Figures 1 to 5 are denoted by the same reference numerals, and their descriptions are omitted. In this modified version of the passage detection system 1001, as shown in Figure 6, in addition to the light-emitting and light-receiving device 100, the system is configured to include a terminal light-emitting device 200 having only a light-emitting unit 2 and a terminal light-receiving device 300 having only a light-receiving unit 3.

[0055] The terminal light emitter 200 has a configuration that does not include the light receiving unit 3, control unit 4, and operating unit 5 compared to the light emitter / receiver 100 shown in Figure 1. In other words, it has only the light emitter 2 and is configured to simply emit detection light L. The terminal light receiving device 300 has a configuration that does not include a light-emitting unit 2, unlike the light-emitting and light-receiving device 100 shown in Figure 1. In other words, it has a configuration that includes a light-receiving unit 3, a control unit 4, and an operating unit 5.

[0056] In this modified example, although not shown in the diagram, multiple light-emitting and receiving devices 100, 100, etc. are arranged in a straight line, with a terminal light-emitting device 200 installed at one end and a terminal light-receiving device 300 installed at the other end. This configuration allows for monitoring of open areas. For example, it can be used to monitor only the entrance area of ​​a space enclosed by a wall.

[0057] "Differentiation Example 2" Further embodiments of the present invention may also be adopted. For example, the light-emitting and receiving device 101 shown in Figure 7 has two light-emitting sections 2 and 2' at different heights. The light-emitting sections 2 and 2' can be rotated in the circumferential direction of the support column 1 to individually adjust the direction of the detected light L. At this time, by making the light-receiving sections 3 and 3' rotate simultaneously, interference between the light-emitting sections 2 and 2' and the light-receiving sections 3 and 3' due to rotation can be prevented. In other words, it is possible to prevent the light-emitting sections 2 and 2' from obstructing the light reception of the light-receiving sections 3 and 3'.

[0058] The light-emitting unit 2' located at the bottom is effective for detecting the passage of small animals such as civets and weasels, or human children, while the light-emitting unit 2 located at the top is effective when detecting the passage of large animals such as wild boars, deer, and bears, as well as adult humans and flying objects. In this way, the detection accuracy can be improved by irradiating the detection light L at multiple heights. Note that the light-emitting units 2·2' and light-receiving units 3·3' may be provided not only at different heights but also at different horizontal angles.

[0059] These light-emitting units 2 and 2' can also be manually selected by the user to illuminate only one of them (for example, the upper light-emitting unit 2). In areas where it is known that there are no large objects, only the lower light-emitting unit 2' can be illuminated, and in areas where only the upper light-emitting unit 2 is needed, only the upper light-emitting unit 2 can be illuminated, thereby preventing false detections and reducing power consumption. Furthermore, by electronically selecting which light-emitting unit to emit light and periodically switching between the upper light-emitting unit 2 and the lower light-emitting unit 2', it becomes possible to efficiently detect objects over a wide range of heights. In addition, by appropriately selecting the direction and height of the detection light, it is possible to distinguish between objects to be detected, such as wild boars, deer, and bears, and non-objects to be detected, such as human children and adults.

[0060] Furthermore, by configuring the light-emitting section 2·2' to be rotatable, when you want to fine-tune the direction of the detected light L in the initial setting mode, it is not necessary to rotate the entire support column 1, allowing for precise fine-tuning. In addition to the above, the light-emitting unit 2 and the light-receiving unit 3 may also be adjusted to change their orientation in the vertical direction.

[0061] "Differentiation Example 3" Further embodiments of the present invention may also be adopted. This modified version of the pest repellent system 2001 further includes an electric fence B, as shown in Figure 8. Electric fence B is used to prevent pests from entering fields and other areas. For example, it can be a type that uses a household power supply to apply a voltage of about 10,000V to the fence.

[0062] In this modified example, the light-emitting and receiving devices 102·102'… used in the pest repellent system 2001 do not have a power source and are configured to receive power from an adjacent electric fence B. In this case, depending on the number of light-emitting / receiving devices 102 installed, the operating voltage on the electric fence B side may decrease. Therefore, it is desirable to take measures to prevent a voltage drop, such as shifting the phase of the light emission pulses of each light-emitting / receiving device 102, 102, etc., to prevent the peak power consumption from becoming too high.

[0063] The present invention is not limited to the embodiments described above, and can be modified as appropriate within the scope of the claims of the present invention. For example, the passage detection system can be designed not as a stake itself, but in a form that can be fitted onto existing stakes like a cap. Furthermore, the laser emitted from the laser module can be used with a rod lens to project a band of detection light. [Explanation of Symbols]

[0064] 100,101,102 Light emitter / receiver device 200 End-of-line floodlighting device 300 Terminal photodetector 1000,1001 Passage Detection System 2000, 2001 Pest Repellent System 1 post 11 Cylinder 12 Tip 2. Light-emitting section 21 Laser Modules 22 Floodlight Cover 23 Collimator lens 3 Light receiving section 31. Photodetector 32 Light-receiving cover 4. Control Unit 5. Operating part B Electric fence L detection light Object S signal

Claims

1. A passage detection system comprising multiple light-emitting and light-receiving devices for detecting objects passing by using light, The light-emitting and light-receiving device comprises a light-emitting unit that emits detection light, a light-receiving unit that receives the detection light, and a control unit that performs predetermined operations according to the light-receiving intensity of the light-receiving unit. The light-receiving unit of any light-transmitting / receiving device is configured to be able to receive detection light emitted by the light-transmitting unit of an adjacent light-transmitting / receiving device, thereby enabling multiple light-transmitting / receiving devices to be connected by detection light. A passage detection system characterized in that, when the light reception intensity of the light receiving section of any light transmitting / receiving device reaches a predetermined threshold, the control unit of the light transmitting / receiving device equipped with the light receiving section that reached that threshold emits a predetermined signal.

2. The device comprises a terminal light-emitting device having a light-emitting unit that emits detection light and a light-receiving unit that receives detection light, a terminal light-receiving device having a light-receiving unit that receives detection light and a light-emitting unit that emits detection light, and a plurality of such light-emitting and light-receiving devices. The light-emitting section of the terminal light-emitting device emits detection light to the light-receiving section of any adjacent light-emitting / receiving device, The passage detection system according to claim 1, characterized in that the light-receiving section of the terminal light-receiving device is each arranged to receive detection light emitted by the light-emitting section of any adjacent light-emitting and light-receiving device.

3. The passage detection system according to claim 1, characterized in that it consists only of a plurality of light-emitting and light-receiving devices, and each light-emitting and light-receiving device is arranged to emit detection light to an adjacent light-emitting and light-receiving device and to receive detection light emitted by other adjacent light-emitting and light-receiving devices.

4. The light-emitting and receiving device is a stake-shaped device, The stake-shaped tip is configured to be driven into the ground, while the stake-shaped head is provided with an operating unit that receives a signal from the control unit and performs a predetermined operation. A passage detection system according to any one of claims 1 to 3, characterized in that the light-emitting unit and the light-receiving unit are provided between the tip and the head.

5. The passage detection system according to any one of claims 1 to 3, characterized in that either or both of the light-emitting unit and the light-receiving unit are configured to adjust the direction of light emission and reception of the detected light.

6. The passage detection system according to any one of claims 1 to 3, characterized in that the light receiving unit is configured to receive detection light from any direction relative to the horizontal.

7. A pest repellent system for driving away animals passing through using the passage detection system described in any one of claims 1 to 3.

8. The pest repellent system according to claim 7, characterized in that the light-emitting unit emits a plurality of detection lights.

9. The pest repellent system according to claim 8, characterized in that the light-emitting unit is capable of selectively emitting any detection light from among a plurality of detection lights.

10. In addition, electric fences are provided. The pest repellent system according to claim 7, characterized in that the power for operating the light-emitting and receiving device is obtained from the electric fence while it is energized or from the power supply of the electric fence.

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