JP7128018B2 - Vehicle detection device and gate device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle detection device for detecting entry and exit of a vehicle at an entrance or exit of a parking lot or the like, and a gate device equipped with the vehicle detection device.

Gate devices are installed, for example, at ETC (Electronic Toll Collection System) gates at tollgates on expressways and toll roads, and at entrances and exits of toll parking lots. The gate device restricts the passage of vehicles by laying down the gate bar (putting it in the closed state) to block the roadway, while allowing the passage of the vehicle by raising the gate bar (putting it in the open state). Some gate devices include a vehicle detection device in order to drive the gate bar as described above when a vehicle before or after passing through the gate is detected. In addition, the vehicle detection device is applied not only to the gate device but also to detect a vehicle.

For example, in Patent Document 1, microwaves are used to flexibly respond to sensor installation conditions in parking areas, and to minimize the effects of rain, a vehicle detection sensor (vehicle detection device) uses microwaves. Equipped with a module and a radome, the FMCW method calculates the distance to a parked vehicle based on the beat frequency signal of the microwave transmission signal and the reception signal reflected by the parked vehicle. to detect And, according to the position of the sensor and the size of the parking area, blocking members protruding in the transmission direction of the microwave are provided on both the left and right sides, the upper and lower sides, or the upper and lower and left and right sides of the module so as to limit the angle of the microwave detection range. , and the module is arranged so that the distance between the module and the surface of the radome is approximately n times the half wavelength of the microwave.

JP 2015-118079 A

However, in the technique of Patent Document 1, the distance between the microwave module and the radome is set to approximately n times the half wavelength of the microwave to reduce the influence of rainfall. In order to ensure the strength of the resin radome, it is necessary to increase the thickness of the radome. In that case, microwaves may be reflected on both the inner and outer surfaces of the radome, and changes in the state of the reflected waves are likely to directly affect vehicle detection performance. state is difficult to set.

In addition, microwaves are emitted from the transmitting antenna of the module in a radial direction, and are approximated as plane waves at a position distant from the transmitting antenna. Therefore, since the microwave reaches the radome in a state of being radiated before becoming a plane wave, it is difficult to make the characteristics uniform. Therefore, when widening the directivity of the transmitted wave, it is desirable to form the radome in a spherical shape in order to make the characteristics uniform in the vicinity of n times the half wavelength of the microwave.

In particular, a vehicle detection device that detects the entry and exit of a vehicle at the entrance and exit of a parking lot, etc., may come into contact with a part of the vehicle. . Therefore, it is necessary to deal with erroneous detection and omission of detection of vehicles due to not only the influence of rainfall but also the reflection of microwaves on the boundary surface between the inner and outer surfaces of the radome. Furthermore, the above vehicle detection sensor cannot adopt a structure that adjusts the direction of the microwave module inside the radome, so it can be used in parking lot entrances and exits that require detection of vehicles in various directions. is unsuitable for For example, when installing this vehicle detection sensor in a gate device at the entrance/exit of a parking lot, it becomes necessary to mount a plurality of microwave modules having different characteristics.

SUMMARY OF THE INVENTION The present invention has been made in view of the problems described above, and an object of the present invention is to provide a vehicle detection device capable of reducing the influence of rainfall while ensuring the thickness of the radome and improving its strength, and the vehicle detection device. To realize a gate device with

In order to solve the above problems, a first vehicle detection device of the present invention is a vehicle detection device for detecting a vehicle, which is mounted on a flat base, transmits a transmission wave, and is reflected by an object. an antenna section for receiving a reflected wave of the transmission wave; and a radome covering the antenna section and having an inclined surface inclined with respect to a transmission direction of the transmission wave from the antenna section toward one end of the base. , the inclined surface is a plane inclined from a position spaced apart from the base in the vicinity of the antenna section to a position close to the base at one end of the base, and is parallel to the plane of the base. It is characterized by being formed at an angle of less than 45 degrees .

According to the first vehicle detection device of the present invention, even if the transmission wave from the antenna section is reflected by the radome due to the influence of rainwater or the like adhering to the outer surface of the radome, the transmission wave is incident on the inclined surface of the radome. , does not reflect in the direction opposite to the direction of transmission. As a result, the reflected wave from the radome does not directly reach the antenna section, so it is possible to prevent erroneous detection of the vehicle due to the influence of rainwater or the like. On the other hand, when the transmitted wave transmitted through the radome is reflected by the vehicle, the reflected wave reflected in the direction opposite to the transmission direction reaches the antenna section, so the vehicle can be reliably detected and stabilized. can.

In order to solve the above-mentioned problems, a second vehicle detection device of the present invention is the first vehicle detection device of the present invention, wherein the antenna section is adjusted so that the transmission direction is not perpendicular to the inclined surface. It is characterized in that the transmission direction of the transmission wave can be adjusted within the range.

The second vehicle detection device of the present invention can be commonly applied to vehicle detection devices that transmit radio waves in different directions. In addition, since the transmission direction of the transmission wave can be adjusted while suppressing the reflection at the boundary surface of the radome, the noise component due to the reflection is reduced regardless of the adjustment state of the transmission direction, and the signal detection accuracy is improved.

In order to solve the above-described problems, a third vehicle detection device of the present invention is the second vehicle detection device of the present invention, wherein the antenna section is supported at the other end opposite to the one end of the base. and the transmission direction is a direction from the antenna section toward one end of the base, and the angles with respect to the base include a minimum angle substantially parallel to the base and a maximum angle inclined 45 degrees from the minimum angle. is adjusted within an adjustment range between

According to the third vehicle detection device of the present invention, even if a long transmission distance of the transmission wave is secured from the antenna section to the inclined surface in the radome, the transmission direction of the transmission wave from the antenna section is adjusted within the adjustment range. be able to. At this time, the incident angle of the transmitted wave with respect to the inclined surface of the radome changes, but the reflected wave from the radome is reflected so as not to directly reach the antenna section. As a result, since the dimension from the base to the surface of the radome can be kept short, the vehicle detection device can be formed in a flat shape, and the projection of the vehicle detection device with respect to the mounting portion such as the gate device can be suppressed. can. In addition, it is possible to easily avoid a collision of an external object against the vehicle detection device, and it is easy to secure the strength for the vehicle detection device to withstand a collision or the like.

In order to solve the above-described problems, a fourth vehicle detection device of the present invention is a vehicle detection device according to the third vehicle detection device of the present invention described above, in which the inclined surface is opposed between the antenna section and one end of the base. and a radio wave absorber attached to the base.

According to the fourth vehicle detection device of the present invention, reflection of radio waves inside the vehicle detection device can be attenuated, noise can be reduced, and vehicles can be stably detected.

In order to solve the above problems, a fifth vehicle detection device of the present invention is the vehicle detection device of any one of the first to fourth aspects of the present invention, wherein the inclined surface is substantially perpendicular to the road surface. It is characterized by being arranged as follows.

According to the fifth vehicle detection device of the present invention, the angle of depression in the transmission direction of radio waves from the vehicle detection device is substantially horizontal, the transmission direction can be arbitrarily variably adjusted with respect to the road surface, and the radome surface is The amount of protrusion to the outside can be suppressed. Furthermore, since the radome surface is arranged in a state perpendicular to the road surface over the entire area, even if it gets wet with water due to rainfall or the like, it can be dropped without leaving any water.

In order to solve the above problems, a first gate device of the present invention is a gate device for regulating passage of vehicles entering and exiting a parking lot through a gate, and is provided facing a road on which vehicles pass. A gate housing and any one of the first to fifth vehicle detection devices described above attached to the gate housing are provided.

According to the first gate device of the present invention, by integrally attaching the vehicle detection device to the gate housing of the gate device, the gate device can be installed integrally with the vehicle detection device in a parking lot or the like. This simplifies the work involved in the construction and reduces the construction cost.

In order to solve the above-mentioned problems, a second gate device of the present invention is the above-described first gate device of the present invention, wherein the gate housing has a recessed mounting portion recessed from a plane perpendicular to the road surface. Further, the vehicle detection device is attached to the recessed attachment portion.

According to the second gate device of the present invention, even if the vehicle approaches the gate device and the front bumper portion of the vehicle contacts and collides with the road side surface of the gate device or the corner portion with the door, the vehicle Since the detection device is housed in the recessed mounting portion, direct contact and collision with the vehicle can be avoided. Since the gate housing and the door of the gate device are made of a material having high strength and are less likely to be damaged, the vehicle detection device can be protected. Therefore, the radome of the vehicle detection device does not need to be made thick to ensure strength, and can be made thin. Therefore, since the amount of attenuation of the radio wave when it passes through the radome can be reduced, the noise is reduced, and the vehicle detection performance can be stably maintained.

In order to solve the above-mentioned problems, a third gate device of the present invention comprises the vehicle detection device in the above-described first or second gate device of the present invention, and detects a vehicle before passing through the gate. a first vehicle detection device; and a second vehicle detection device configured by the vehicle detection device and configured to detect a vehicle after passing through the gate, wherein the first vehicle detection device and the second vehicle The detection devices are arranged on two adjacent surfaces perpendicular to the road surface in the gate housing.

According to the third gate device of the present invention, the gate housing of the gate device has a simple structure, can be manufactured at low cost, and can stably detect vehicles entering and exiting the lane of the parking lot.

ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to implement|achieve the vehicle detection apparatus which can reduce the influence of a rainfall, and a gate apparatus provided with the said vehicle detection apparatus, ensuring the thickness of a radome and improving intensity|strength.

1 is a plan view showing a gate system provided with a gate device according to an embodiment of the present invention; FIG. It is a Y arrow directional view of FIG. It is a perspective view showing a gate device concerning an embodiment of the present invention. 1 is a perspective view showing a vehicle detection device according to an embodiment of the invention; FIG. It is a sectional view showing the 1st vehicle detection device and the 2nd vehicle detection device with which the gate device concerning the embodiment of the present invention was attached. It is a block diagram showing an electrical configuration of a gate device according to an embodiment of the present invention. It is a graph which shows the frequency characteristic of the reflected wave which the vehicle detection apparatus received. 4 is a flowchart showing vehicle detection operation in the vehicle detection device according to the embodiment of the present invention; 4 is a flow chart showing opening and closing operations of the gate bar in the gate device according to the embodiment of the present invention; 1 is a plan view showing a vehicle entering state in a gate system according to an embodiment of the present invention; FIG. FIG. 4 is a perspective view showing a gate device according to another embodiment of the present invention; FIG. 5 is a cross-sectional view showing a first vehicle detection device and a second vehicle detection device to which a gate device according to another embodiment of the present invention is attached;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiments are preferred specific examples of the present invention and disclose various preferred techniques, but the technical scope of the present invention is not limited to these aspects.

First, the gate device 1 according to the embodiment of the present invention will be explained. As shown in FIG. 1 and the like, the gate device 1 is provided in the vicinity of a gate such as an entrance/exit of a parking lot 101 or a tollbooth of an expressway or a toll road, and constitutes a gate system 100 . In the gate system 100, an entrance gate device 1a for regulating entry of a vehicle 102 into a parking lot 101 is arranged along an entrance roadway 103, and the entrance roadway 103 is blocked (see FIG. 2) or opened by a gate bar 13. be. In addition, an exit gate device 1b for restricting exit of the vehicle 102 from the parking lot 101 is arranged along the exit road 104, and the exit road 104 is blocked or opened by the gate bar 13. In the vicinity of the entrance road 103, a parking ticket issuing machine (hereinafter referred to as a ticket issuing machine) 105 is arranged on the front side of the entrance gate device 1a in the traveling direction in which the vehicle 102 enters. In the vicinity of the exit road 104, a parking fee adjustment machine (hereinafter referred to as an adjustment machine) 106 is arranged in front of the exit gate device 1b in the direction in which the vehicle 102 exits.

For example, the ticket issuing machine 105 outputs an opening permission signal for opening the entrance road 103 according to an entrance operation such as issuing a parking ticket by a user of the vehicle 102 entering the entrance road 103 . The adjustment machine 106 outputs an opening permission signal for opening the exit road 104 to the outside, for example, in response to an exit operation such as payment of a parking fee by a user of the vehicle 102 entering the exit road 104 . The opening permission signal indicates ON when the entrance road 103 or the exit road 104 is to be opened, and indicates OFF when the entrance road 103 or the exit road 104 is blocked.

The entrance gate device 1a and the exit gate device 1b have the same configuration. and a second vehicle detection device 2b for detecting the vehicle 102 in the detection area 3b. Therefore, hereinafter, the entrance gate device 1a and the exit gate device 1b will be described as the gate device 1 without distinguishing between them.

As shown in FIGS. 2 and 3, the gate device 1 includes a gate housing 10, a door 11, a bar holding portion 12, and a gate bar 13, and further includes a first vehicle detection device 2a and a second vehicle detection device 2a. A vehicle detection device 2b is provided.

Gate housing 10 is fixed on island 107 along entry lane 103 or exit lane 104 . The gate housing 10 is formed in a cubic box shape, and is open on the front side in the traveling direction. The gate housing 10 has a rotating shaft (not shown) extending from the inside toward the back in the traveling direction, and the rotating shaft is rotated by a gate bar drive unit 43 (see FIG. 6) such as a motor. configured to be movable. The door 11 is attached to the gate housing 10 on the front side in the traveling direction so that the opening of the gate housing 10 can be opened and closed. By opening the door 11, the internal structure of the gate housing 10 can be maintained.

The bar holding portion 12 is fixed to the rotating shaft of the gate housing 10 on the back side in the traveling direction. The gate bar 13 is made of a non-metallic material such as glass fiber, without using a metallic material such as aluminum that affects directivity due to the reflection of radio waves, and is made to the extent that it can block the entrance road 103 and the exit road 104. It is shaped like a bar with a length of .

The gate bar 13 is fixed by being held by the bar holding portion 12 at one end in the longitudinal direction. The gate housing 10 rotates the rotation axis to rotate the bar holding part 12 and the gate bar 13 around the rotation axis, so that the gate bar 13 is in a lying position blocking the entrance road 103 and the exit road 104. (see FIG. 2) and a standing position for opening the entrance lane 103 and the exit lane 104 .

The first vehicle detection device 2a is a device used for starting ticket issuance and settlement, and is on the front side of the gate bar 13 in the direction of travel and faces the entrance road 103 or the exit road 104 on the surface 10a of the gate housing 10. can be attached to The first vehicle detection device 2a is arranged, for example, on this surface 10a at a height of about 600 mm from the island 107 and on the frontmost side in the traveling direction.

The second vehicle detection device 2b is a device used for closing the gate, and is attached to the surface 10b of the gate housing 10 holding the gate bar 13 on the back side in the traveling direction of the first vehicle detection device 2a. The second vehicle detection device 2b is arranged, for example, on this surface 10b at a height of about 600 mm from the island 107 and closest to the entrance lane 103 or exit lane 104. FIG. The second vehicle detection device 2b is located below the bar holding portion 12 and does not come into contact with the gate bar 13 that opens and closes. It is attached spaced apart from the portion 12 .

The first vehicle detection device 2a and the second vehicle detection device 2b are attached at positions separated from each other in plan view of the gate housing 10 so that their directivity is not influenced by each other. Since the first vehicle detection device 2a and the second vehicle detection device 2b have the same structure except for their mounting positions and the mounting direction of the radar module 24, the common configuration will be described as the vehicle detection device 2. , and different configurations will be described later. When describing the common configuration of the vehicle detection device 2, the first detection area 3a and the second detection area 3b will be described as the detection area 3 without distinguishing between them.

As shown in FIGS. 4 and 5, the vehicle detection device 2 includes a base 20, a cover 21, a radome 22, a main board 23, a radar module 24, a detection area direction adjustment section 25, and a radio wave absorption section 26. and a heater 27 . In the following description of the vehicle detection device 2, for the sake of convenience, the side attached to the gate housing 10 is referred to as "rear (rear)" and the side away from the gate housing 10 is referred to as "front (front)." The left side is defined as "left", the right side as "right", the upper side as "upper", and the lower side as "lower". The base 20, the cover 21 and the radome 22 are combined to form a case that accommodates the main substrate 23, the radar module 24, the detection area direction adjusting section 25, the radio wave absorbing section 26, the heater 27 and other sections of the vehicle detecting device 2. However, this case has a substantially rectangular shape when viewed from the front.

The base 20 is a substantially rectangular plate member when viewed from the front, and is made of a resin material such as ASA resin, ABS resin, or polycarbonate that does not easily affect the antenna characteristics. The back surface of the base 20 serves as an attachment surface to be attached to the gate housing 10 . The base 20 has base mounting holes 20a passing through in the front-rear direction on its periphery, and is mounted on the gate housing 10 by screws passing through the base mounting holes 20a from the front side. Further, the base 20 has a wire insertion hole 20b penetrating in the front-rear direction in the upper part thereof, and a group of cables 28 from the main board 23 and the radar module 24 are routed to the gate housing 10 through the wire insertion hole 20b. be done. The base 20 has cover fixing holes for attaching the cover 21 .

A waterproof packing (not shown) is provided on the periphery of the front side of the base 20 and interposed between the base 20 and the cover 21 . A waterproof packing (not shown) is provided on the periphery of the back side of the base 20 and interposed between the base 20 and the gate housing 10 . A dust-proof packing (not shown) is provided on substantially the entire rear surface of the base 20 (excluding the portions where the base mounting holes 20a and the wiring insertion holes 20b are provided). Each packing can be removed and replaced.

On the lower left side of the front side of the base 20, a bearing portion 30 constituting a detection area direction adjusting portion 25 is formed so as to protrude forward from both upper and lower sides. The bearing 30 is configured to horizontally rotatably support the radar module 24 for orientation adjustment of the detection area 3 .

The cover 21 and the radome 22 are integrally formed of a resin material such as ASA resin, ABS resin, or polycarbonate that does not easily affect the antenna characteristics. The cover 21 and the radome 22 are hollow and formed in a box shape with one side narrowed when viewed from above, and the front surfaces thereof are inclined rearward toward the right side. Such a slanted shape allows the cover 21 and the radome 22 to have a small amount of forward projection to avoid contact with the vehicle 102, particularly its bumper, as much as possible. The vehicle detection device 2 is arranged so that the front surfaces of the cover 21 and the radome 22 are on a plane perpendicular to the road surfaces of the entrance road 103 and the exit road 104 .

The rear surface of the integrated cover 21 and radome 22 has an opening and is attached to the front side of the base 20 so as to block the opening. Cover 21 and radome 22 are removably attached to base 20, for example, by screws. By removing the radome 22, the detection area direction adjusting portion 25 is exposed, and the rotational position of the radar module 24 (the direction of the detection area 3) can be adjusted.

The cover 21 is a member that covers the upper portion of the front side of the base 20, particularly the main board 23, the heater 27, and the wiring insertion hole 20b. It is a member that covers the adjusting portion 25 and the radio wave absorbing portion 26 . The radome 22 covers the front surface of the radar module 24 in the direction in which radio waves are transmitted by the antenna unit 31 to protect it from wind, rain and dust.

The radome 22 has an inclined surface 22a whose front surface is inclined rearward toward the right side. For example, the inclined surface 22a is inclined at the same angle from a position close to the right side of the radar module 24 (bearing portion 30) to the right end of the radome 22 in the left-right direction. The inclined surface 22a is formed at an angle that is not orthogonal to the direction of transmission of the transmitted wave from the radar module 24, for example, as shown in FIG. formed by The thickness of the radome 22 is set in consideration of the wavelength of radio waves used in the antenna section 31 and the dielectric constant of the resin applied to the radome 22 so that passing radio waves do not affect it.

The main board 23 is a circuit board on which a CPU 50a and a memory 50b are provided (see FIG. 6). Determine whether or not A cable group 28 such as power wiring and signal lines is connected to the main substrate 23 , and the cable group 28 is connected to the gate device 1 through the wiring insertion hole 20 b of the base 20 . Electric power is supplied from the gate device 1 to the vehicle detection device 2 (main substrate 23) through the cable group 28. FIG. The details of the electrical configuration of the main board 23 will be described later.

The main board 23 is formed in a rectangular plate shape, and is attached to the upper front side of the base 20 as shown in FIGS. 4 and 5 . Note that the main board 23 may be removable from the base 20 .

The radar module 24 is a circuit board on which a CPU 55a and a memory 55b are provided (see FIG. 6). (vehicle 102) is detected. A flexible cable 32 that is flexible and deformable is connected to the radar module 24 , and the flexible cable 32 is connected to the main substrate 23 . Power is supplied from the main board 23 to the radar module 24 via the flexible cable 32 . By using the flexible cable 32, even if the radar module 24 is rotated by the detection area direction adjusting part 25 for adjusting the detection area 3, there is no problem in the connection state between the main board 23 and the flexible cable 32. - 特許庁The details of the electrical configuration of the radar module 24 will be described later.

The radar module 24 is formed in the shape of a rectangular plate, and as shown in FIGS. 4 and 5, is attached to a box-shaped holder 33 constituting the detection area direction adjusting section 25 with its surface exposed. The radar module 24 is held by the holder 33 so as not to cover its surface (antenna portion 31 ), and the upper and lower surfaces of the holder 33 are formed with rotating shafts extending in the vertical direction. The rotation axis of the holder 33 is supported by the rotation center of the bearing portion 30 of the base 20, so that the holder 33 rotates horizontally (clockwise or counterclockwise when viewed from above) together with the radar module 24. be possible.

Note that the radar module 24 may be removable from the holder 33 , and the holder 33 may be removable from the bearing portion 30 . As a result, when the radar module 24 fails, it can be easily replaced with a new radar module 24, and when it is desired to change the characteristics of the radar module 24 (directivity of transmission and reception of the antenna section 31, etc.), , it can be easily exchanged with another radar module 24 having a different antenna section 31 .

An antenna unit 31 is attached to the center of the surface of the radar module 24 for transmitting a transmitted wave and receiving a reflected wave of the transmitted wave reflected by an object. The antenna section 31 radially emits transmission waves, and in this embodiment, the direction along the radiation center line of the transmission waves is the transmission direction of the transmission waves by the antenna section 31 (that is, the transmission direction of the radar module 24). . For example, the radiation center line of the transmission wave of the antenna section 31 is set perpendicular to the surface center of the radar module 24 . The antenna unit 31 particularly receives reflected waves transmitted in the direction opposite to the transmission direction, but can also receive reflected waves transmitted in the radiation direction.

As described above, the detection area direction adjusting section 25 is composed of the bearing section 30 of the base 20 and the holder 33 of the radar module 24, and makes the holder 33 (radar module 24) rotatable in the horizontal direction. The transmission direction of the radar module 24 is determined by the rotational position (orientation of the surface) of the radar module 24 , and the extension of the transmission direction of the radar module 24 is the detection area 3 in which the vehicle can be detected by the radar module 24 . Therefore, the direction of the detection area 3 can be adjusted by operating the detection area direction adjustment unit 25 to change the rotational position of the radar module 24 .

The detection area direction adjusting unit 25 basically sets the rotational position of the radar module 24 with the transmission direction of the radar module 24 facing the inclined surface 22 a of the radome 22 . Since the radar module 24 is provided on the left bearing portion 30 of the base 20 and the inclined surface 22a covers the right side of the base 20, the transmission direction of the radar module 24 is basically the direction toward the right end of the base 20. becomes.

Further, the detection area direction adjustment unit 25 may include a regulation mechanism that regulates the rotation of the radar module 24 so that the transmission direction of the radar module 24 is within an adjustment range that is not orthogonal to the inclined surface 22a of the radome 22. . For example, the adjustment range of the transmission direction of the radar module 24 is set as an angle with respect to the base 20 between a minimum angle substantially parallel to the base 20 and a maximum angle inclined 45 degrees from this minimum angle.

In FIG. 5, the line β1 indicates the transmission direction inclined at the minimum angle with respect to the parallel line β0 of the base 20. In FIG. A line β2 indicates the transmission direction in the reference state in the case of the second detection area 3b after passing through the gate, and a line β3 indicates the transmission direction in the reference state in the case of the first detection area 3a before passing the gate. Further, the transmission direction inclined at the maximum angle with respect to the parallel line β0 of the base 20 is indicated by a line β4. Thus, the transmission direction of the radar module 24 is adjusted within the adjustment range from line β1 to line β4.

For example, when the transmission direction of the radar module 24 is set along the minimum angle line β1, the transmission wave is incident on the inclined surface 22a of the radome 22 at the incident angle θ1. When the transmitted wave is reflected by the inclined surface 22 a , the reflected wave is reflected at the angle of reflection θ 1 toward the surface of the base 20 . When the transmission direction of the radar module 24 is set along the maximum angle line β4, the transmission wave is incident on the inclined surface 22a of the radome 22 at the incident angle θ4. When the transmitted wave is reflected by the inclined surface 22a, the reflected wave is reflected at a reflection angle θ4 toward the surface of the base 20. FIG. Accordingly, as the radar module 24 rotates, the angle of the transmission direction of the radar module 24 with respect to the inclined surface 22a changes within the range of incident angles θ1 to θ4.

Further, the detection area direction adjustment unit 25 rotates the radar module 24 appropriately to adjust the transmission direction of the radar module 24, that is, the direction of the detection area 3, and then fixes the adjusted state (rotational position of the radar module 24). A fixing mechanism may be provided for.

For example, the detection area direction adjustment unit 25 includes a ratchet mechanism at the contact portion of the bearing 30 and the holder 33 as the regulation mechanism and fixing mechanism described above, and rotates the radar module 24 by a predetermined step angle (for example, 5 degrees). ) can be variably adjusted in multiple steps and the adjusted state can be maintained. The ratchet mechanism may be configured to limit rotation of the radar module 24 within a minimum and maximum angular adjustment range.

The radio wave absorbing part 26 is provided at the lower part of the front side of the base 20, at the right side of the bearing part 30, i.e., the radar module 24, where the reflected wave reflected by the radome 22 directly reaches the transmission wave of the radar module 24. be done. The radio wave absorbing portion 26 may be composed of, for example, a radio wave absorbing sheet attached to the base 20 or a large number of projections protruding from the surface of the base 20 to diffuse radio waves.

The heater 27 heats the radome 22 and the cover 21 in order to prevent snow from adhering to the radome 22 and the cover 21 and condensation during snowstorms. The heater 27 is connected to the main board 23 via a cable. The heater 27 is arranged, for example, in contact with the radome 22 and the cover 21 , and silicon grease is applied between the radome 22 and the cover 21 .

Next, an electrical configuration of the gate device 1 including the first vehicle detection device 2a and the second vehicle detection device 2b will be described with reference to FIG.

First, the electrical configuration of the gate device 1 will be described. A body-side substrate 14 is provided in the gate housing 10. The body-side substrate 14 includes a control unit 40 for integrally controlling the gate device 1, a first vehicle detection device 2a, and a second vehicle detection device. A signal input unit 41 for inputting a detection signal from the device 2b and an external communication unit 42 for communicating with external devices such as the ticket issuing machine 105 and the payment machine 106 are provided. A gate bar drive unit 43 that drives the bar holding unit 12 and the gate bar 13 to rotate is connected to the main body side substrate 14 .

The control unit 40 includes a CPU (Central Processing Unit) 40a and a memory 40b, which are connected via a bus 40c. The memory 40b includes a ROM (Read Only Memory), a RAM (Random Access Memory), a hard disk, a flash memory, etc., and stores programs and data for controlling each part of the gate device 1 (main body side substrate 14). The CPU 40a reads programs and data stored in the memory 40b and executes the programs. The bus 40c is further connected to an interface 40d, and the control section 40 is connected to the signal input section 41, the external communication section 42 and the gate bar driving section 43 via the bus 40c and the interface 40d to control each section.

The signal input unit 41 is an external interface that is wired or wirelessly connected to the first vehicle detection device 2a and the second vehicle detection device 2b. The signal input unit 41 receives detection signals from the first vehicle detection device 2a and the second vehicle detection device 2b, and transmits the detection signals to the external communication unit 42 and the gate bar driving unit 43 via the bus 40c and the interface 40d. and send. The detection signal indicates ON when the first vehicle detection device 2a or the second vehicle detection device 2b detects the target object (vehicle 102). OFF is indicated when the detection device 2b does not detect an object (vehicle 102).

The external communication unit 42 is an external interface that is wired or wirelessly connected to an external device such as the ticket issuing machine 105 or the payment machine 106 . The external communication unit 42 receives the above-described opening permission signal from the ticket issuing machine 105 or the payment machine 106, and transmits the opening permission signal to the gate bar driving unit 43 via the bus 40c and the interface 40d. In addition, when the external communication unit 42 receives the ON detection signal of the first vehicle detection device 2 a from the signal input unit 41 , the external communication unit 42 transmits the signal to the ticket issuing machine 105 and the payment machine 106 . By inputting an ON detection signal, the ticket issuing machine 105 and the fare adjustment machine 106 recognize the vehicle 102 approaching the ticket issuing machine 105 and the fare adjustment machine 106 by entering the entrance road 103 and the exit road 104, and issue a parking ticket. Issuance and settlement processing can be performed.

The gate bar drive unit 43 drives the bar holding unit 12 and the gate bar 13 based on the detection signal from the signal input unit 41, the open permission signal from the external communication unit 42, and the like. The gate bar drive unit 43 is composed of a motor or the like, and operates based on the following signal processing executed by the control unit 40 . For example, the gate bar driving section 43 normally keeps the bar holding section 12 and the gate bar 13 closed.

When the gate bar driving section 43 receives the ON detection signal and the ON opening permission signal of the first vehicle detection device 2a when the gate bar 13 is in the closed state, the gate bar driving section 43 drives the bar holding section 12 and the gate bar 13 to stand up. . When the bar holding portion 12 and the gate bar 13 are rotationally driven to the standing position, the gate bar 13 is opened, and the gate bar driving portion 43 maintains the bar holding portion 12 and the gate bar 13 in the open state. Further, when the gate bar 13 is in the open state, the gate bar drive unit 43 inputs the ON detection signal of the second vehicle detection device 2b, and then the first vehicle detection device 2a and the second vehicle detection device 2b are turned on. When each OFF detection signal is input, the bar holding portion 12 and the gate bar 13 are driven to lie down.

Next, the electrical configurations of the first vehicle detection device 2a and the second vehicle detection device 2b provided in the gate device 1 will be described. Since the first vehicle detection device 2a and the second vehicle detection device 2b are configured similarly, FIG. Illustrations are omitted. Further, the first vehicle detection device 2a will be described below, and the description of the second vehicle detection device 2b will be omitted.

The first vehicle detection device 2a is provided with the main substrate 23 and the radar module 24 as described above. The main substrate 23 includes a control unit 50 for integrally controlling each part of the main substrate 23, a communication unit 51 for communicating with the radar module 24, a vehicle determination unit 52 for determining vehicle detection, A signal output unit 53 for outputting a detection signal to the main body side substrate 14 is provided.

The control section 50 comprises a CPU 50a and a memory 50b, and is connected to a bus 50c and an interface 50d. Regarding the control unit 50, the description of the configuration similar to that of the control unit 40 of the main body side substrate 14 is omitted. The memory 50b stores, for example, a control program for controlling each part of the main substrate 23. FIG. The control unit 50 is connected to the communication unit 51, the vehicle determination unit 52 and the signal output unit 53 via the bus 50c and the interface 50d to control each unit.

The communication unit 51 is connected to the communication unit 57 of the radar module 24 via the flexible cable 32 and receives an object detection signal from the radar module 24 .

The vehicle determination unit 52 determines whether or not the object detected by the radar module 24 is an automobile (vehicle 102 ) based on the detection signal that the communication unit 51 has input from the radar module 24 . For example, when the signal generation processing unit 56 of the radar module 24 generates a beat frequency signal of the transmission signal and the reception signal, the vehicle determination unit 52 detects the object and the vehicle detection device 2 (radar module) based on the beat frequency signal. The presence or absence of the vehicle 102 is determined by detecting object data such as the distance to the antenna unit 31) of 24, the relative speed of the object, the reception level, etc., and analyzing the pattern of the beat frequency signal. The vehicle determination unit 52 detects only automobiles and discards data on people, bicycles, motorbikes, structures, and the like. Then, the vehicle determination unit 52 generates a detection signal that indicates the determination result by ON or OFF. The vehicle determination unit 52 may be configured by a program that is executed by the control unit 50 to perform the signal processing as described above.

The signal output section 53 is connected to the signal input section 41 of the main body side substrate 14 via the cable group 28 and outputs the detection signal generated by the vehicle determination section 52 to the signal input section 41 .

The radar module 24 includes a control section 55 for centrally controlling each section of the radar module 24, the antenna section 31, a signal generation processing section 56 for processing radio waves transmitted and received by the antenna section 31, and the main substrate 23. and a communication unit 57 for communicating with. The radar module 24 is configured, for example, to apply a frequency-modulated signal to the radio waves using the FMCW method, or it may employ a two-frequency CW method.

The control unit 55 includes a CPU 55a and a memory 55b, and is connected to a bus 55c and an interface 55d. Regarding the control unit 55, the description of the configuration similar to that of the control unit 40 of the main body side substrate 14 is omitted. The memory 55b stores, for example, a control program for controlling each part of the radar module 24 . The control section 55 is connected to the antenna section 31, the signal generation processing section 56 and the communication section 57 via a bus 55c and an interface 55d to control each section.

The antenna unit 31 is electrically connected to the front surface of the radar module 24, transmits (radiates) transmission waves to the detection area 3, and transmits transmission waves reflected by an object (for example, vehicle 102) in the detection area 3. is configured to receive the reflected wave of For example, the antenna unit 31 transmits, as transmission waves, radio waves in the frequency band of the microwave band (24 GHz band), which is excellent in environmental resistance performance and cost merits, for example, 24.05 to 24 with 24.15 GHz as the center frequency. It transmits radio waves with a frequency of .25 GHz. The antenna section 31 may radiate transmission waves continuously or intermittently.

For example, the antenna section 31 is composed of a planar antenna (patch antenna) such as a microstrip antenna in which a strip conductor is arranged on a dielectric substrate. The antenna section 31 includes a transmitting section as a transmitting antenna and a receiving section as a receiving antenna. In the antenna section 31, wiring lines for transmitting signals connected to the transmitting antenna and the receiving antenna, and wiring lines for supplying and receiving power to each section are formed on the substrate by etching.

The signal generation processing unit 56 generates a transmission wave signal transmitted by the antenna unit 31, processes a reflected wave signal received by the antenna unit 31, and generates a detection signal indicating the object detection result by the radar module 24. to generate The signal generation processing unit 56 may be configured by a program that is executed by the control unit 55 and performs the following signal processing.

For example, the signal generation processing unit 56 includes a signal generation unit that frequency-modulates a signal having a predetermined waveform pattern oscillated from an oscillator in accordance with the FMCW method to generate an FMCW signal, and a transmission wave that outputs a transmission wave of the FMCW signal to a transmission unit. Output part, directional coupling part that splits a part of the FMCW signal output to the transmission part, FMCW signal (transmission signal) split by the directional coupling part and reflected wave signal (reception signal) received by the reception part ) and a detection processor that processes the beat frequency signal and outputs it as an object detection signal. The detection processing unit of the signal generation processing unit 56 filters the beat frequency signal of the analog signal, A/D-converts the filtered beat frequency signal into a digital beat frequency signal, and converts the beat frequency signal of the digital signal into a digital beat frequency signal. FFT processing is performed on the frequency signal to generate and output a detection signal.

The communication section 57 is connected to the communication section 51 of the main board 23 via the flexible cable 32 and transmits the detection signal output from the signal generation processing section 56 to the communication section 51 of the main board 23 . The signal generation processing section 56 or the communication section 57 may amplify the beat frequency signal or the detection signal.

Next, the vehicle detection device 2 including the radome 22 having the inclined surface 22a inclined with respect to the transmission direction of the transmission wave of the antenna section 31 as in the present embodiment, and the plane perpendicular to the transmission direction of the transmission wave. The characteristics of the received reflected waves will be described for a conventional vehicle detection device equipped with a radome having . 7 (1) to (4) show graphs of frequency characteristics after FFT conversion of reflected waves received when an object such as the vehicle 102 is not detected, where the I wave is a solid line and the Q wave is a dashed line. indicated by .

In the conventional vehicle detection device, before rainfall, that is, when water does not adhere to the surface of the radome, as shown in FIG. be done.

However, when it rains, that is, when water adheres to the surface of the radome, the dielectric constants of plastic, air, and water, which are the materials of the radome, differ from each other. , the reflection state of radio waves may change significantly. Specifically, the transmission wave transmitted from the antenna section may be totally reflected at the interface between plastic and water on the outer surface of the radome, or the reflectance may be significantly increased.

In the conventional vehicle detection device, since the radome has a plane perpendicular to the transmission direction of the transmission wave, the reflected wave reflected by the radome may be transmitted in the direction opposite to the transmission direction and received by the antenna section. . Then, in the conventional vehicle detection device, as shown in FIG. 7(2), the Q wave becomes a waveform with extremely strong reflection, and the I wave becomes a waveform that changes according to up/down sampling. Therefore, the conventional vehicle detection device may erroneously detect a reflected wave from the radome as a reflected wave from a vehicle in the immediate vicinity of the vehicle detection device during rainfall, and erroneously determine that there is a vehicle.

On the other hand, in the vehicle detection device 2 of the present embodiment, when water is not attached to the surface of the radome 22, as shown in FIG. An IQ waveform is obtained. Further, in the vehicle detection device 2 of the present embodiment, when water adheres to the surface of the radome 22, the radome 22 has the inclined surface 22a inclined with respect to the transmission direction of the transmission wave. The reflected wave reflected by the surface 22a is not reflected in the direction opposite to the transmission direction. Therefore, as shown in FIG. 7(4), the I wave and the Q wave show a slightly stronger reflection than before the rainfall, but the level does not affect the vehicle detection characteristics, and it is not determined that there is a vehicle.

Next, the operation of detecting an object of the vehicle 102 by the vehicle detection devices 2 such as the first vehicle detection device 2a and the second vehicle detection device 2b will be described with reference to the flowchart of FIG.

First, in the vehicle detection device 2 , the signal generation processing unit 56 of the radar module 24 frequency-modulates a signal having a predetermined waveform pattern in accordance with the FMCW system to generate a transmission wave of the FMCW signal, which is output to the transmission unit of the antenna unit 31 . (step S1).

A transmission wave of the FMCW signal is radiated to the detection area 3 by the transmission section of the antenna section 31 (step S2). The transmitted wave propagates along the transmission direction β of the radar module 24 and normally transmits through the inclined surface 22a of the radome 22, although part of the transmitted wave may be reflected by the inclined surface 22a. . At this time, the inclined surface 22a is not perpendicular to the transmission direction β of the radar module 24, but is inclined at a predetermined angle (90−θ). and part of the transmitted wave is reflected at the angle of reflection θ. Then, the reflected wave (abnormal reflected wave) reflected by the inclined surface 22a is transmitted at a predetermined angle (90-θ) with respect to the transmission direction β of the radar module 24, and is not directed to the antenna section 31. , is incident toward the radio wave absorbing portion 26 .

On the other hand, when the transmitted wave transmitted through the radome 22 strikes the object, the reflected wave (normal reflected wave) of the transmitted wave reflected by the object is transmitted in the direction opposite to the transmission direction β and received by the receiving portion of the antenna portion 31. (step S3).

A reflected wave received by the receiving section of the antenna section 31 is transmitted to the signal generating and processing section 56. The signal generating and processing section 56 generates an analog signal based on the frequency difference between this reflected wave and the original transmission wave of this reflected wave. A beat frequency signal of the signal is generated and filtered (step S4).

Further, in the signal generation processing section 56, the beat frequency signal after filter processing is converted into a beat frequency signal of a digital signal by A/D conversion (step S5).

Further, in the signal generation processing section 56, the beat frequency signal of the digital signal is subjected to FFT processing to generate a detection signal (step S6). This detection signal is transmitted to the communication section 51 of the main board 23 by the communication section 57 .

In the main board 23, the vehicle determination unit 52 determines the distance between the object and the vehicle detection device 2 (step S7), the relative speed of the object (step S8), the reception level, and the like based on the FFT-processed detection signal. Object data such as (step S9) are calculated. The signal generation processing unit 56 of the radar module 24 may perform the processing from step S7 to step S9.

The vehicle determination unit 52 of the vehicle detection device 2 determines whether or not the object is the vehicle 102 based on the detected object data (step S10). Then, when it is determined that the object is the vehicle 102 (step S10: YES), the ON detection signal is generated by the vehicle determination unit 52, and the signal output unit 53 detects the main body side substrate 14 in the gate housing 10. It is output to the signal input unit 41 (step S11).

On the other hand, when it is determined that the object is not the vehicle 102 (step S10: NO), the vehicle determination unit 52 generates an OFF detection signal, and the signal output unit 53 outputs it to the signal input unit 41 of the main body side substrate 14. At the same time, the detected object data is discarded (step S12).

Next, the detection operation of the vehicle 102 by the vehicle detection device 2 and the opening/closing operation of the gate bar 13 by the gate device 1 in the entrance gate device 1a will be described with reference to the flowchart of FIG. Although an operation example of the entrance gate device 1a will be described here, the exit gate device 1b operates in the same manner.

First, in the gate device 1, the gate bar 13 is closed, and the presence or absence of the vehicle 102 in the first detection area 3a is detected based on the detection signal input to the signal input section 41 from the first vehicle detection device 2a. It is monitoring (step S21).

Then, when the vehicle 102 enters the entry roadway 103, the vehicle 102 is detected by the first vehicle detection device 2a, and an ON detection signal is input to the signal input unit 41 (step S21: YES). This ON detection signal is further transmitted to the ticket issuing machine 105 by the external communication unit 42 .

The ticket issuing machine 105 issues a parking ticket based on the ON detection signal of the first vehicle detection device 2a (step S22). When the parking ticket is removed from the ticket issuing machine 105 and the issuing process is completed (step S23: YES), the ticket issuing machine 105 transmits an open permission signal to the gate device 1 . At this time, if there is a vehicle 102 immediately after passing through the gate, opening the gate bar 13 may cause an accident or the like.

If the ticket issuing machine 105 determines that the parking ticket has not been removed from the ticket issuing machine 105 (step S23: NO) and the predetermined period of time has elapsed (step S24: YES), the issuing process is not completed and the parking ticket is issued. is collected (step S25). For example, the ticket issuing machine 105 notifies the gate device 1 that the parking ticket could not be issued, and the gate device 1 monitors the presence or absence of the vehicle 102 by the first vehicle detection device 2a (step S21). ).

When the parking ticket issuance process is completed as described above (step SS23: YES), the external communication unit 42 of the gate device 1 inputs an opening permission signal and further transmits the signal to the gate bar driving unit 43. The gate bar drive unit 43 rotates the bar holding unit 12 and the gate bar 13 to the upright position based on the ON detection signal and the ON open permission signal of the first vehicle detection device 2a, and the gate bar 13 is opened. The vehicle 102 can pass through the entrance road 103 (step S26).

Further, the gate device 1 monitors the presence or absence of the vehicle 102 in the second detection area 3b based on the detection signal input to the signal input section 41 from the second vehicle detection device 2b (step S27). Then, when the vehicle 102 passes through the open gate bar 13, the vehicle 102 is detected by the second vehicle detection device 2b, and an ON detection signal is input to the signal input unit 41 (step S27: YES).

If the vehicle 102 does not pass through the open gate bar 13 and the vehicle 102 is not detected by the second vehicle detection device 2b, the OFF detection signal remains input to the signal input unit 41 (step S27: NO). ). In this way, when the vehicle 102 does not pass through the gate bar 13 in the open state after the gate bar 13 is opened and it is determined that a timeout has elapsed (step S28: YES), the vehicle 102 passes the gate bar 13. It is considered that the vehicle 102 has not properly moved from the previous position, and the gate device 1 judges that there is a problem with the entry of the vehicle 102, and outputs an alarm by voice, alarm, lamp, or the like (step S29).

After the vehicle 102 passes through the open gate bar 13 (step S27: YES), when the vehicle 102 further advances through the entrance road 103 and crosses the first detection area 3a, the first vehicle detection device 2a detects the vehicle. 102 is undetected, and an OFF detection signal is input to the signal input unit 41 (step S30: YES).

If the vehicle 102 does not cross the first detection area 3a and the vehicle 102 is not detected by the first vehicle detection device 2a, the ON detection signal remains input to the signal input unit 41 (step S30). : NO). In this way, if the vehicle 102 does not cross the first detection area 3a after the vehicle 102 is detected by the second vehicle detection device 2b and the predetermined time elapses and it is determined that a timeout has occurred (step S31: YES), the vehicle 102 is not properly moved from the position straddling the gate bar 13 in the open state, the gate device 1 judges that there is a problem with the entry of the vehicle 102, and outputs an alarm by voice, alarm, lamp, etc. ( step S29).

After the vehicle 102 has crossed the first detection area 3a (step S30: YES), when the vehicle 102 further advances through the entrance road 103 and crosses the second detection area 3b, the second vehicle detection device 2b At , the vehicle 102 is not detected, and an OFF detection signal is input to the signal input unit 41 (step S32: YES), and further input to the gate bar driving unit 43 .

After inputting the ON detection signal from the second vehicle detection device 2b as described above, the gate bar drive unit 43 detects the OFF signal input from each of the first vehicle detection device 2a and the second vehicle detection device 2b. , the bar holding portion 12 and the gate bar 13 are rotated to the lying position, the gate bar 13 is closed, and the entry lane 103 is blocked (step S33).

If the vehicle 102 does not cross the second detection area 3b and the vehicle 102 is not detected by the second vehicle detection device 2b, the ON detection signal remains input to the signal input unit 41 (step S32). : NO). In this way, if the vehicle 102 does not cross the second detection area 3b after the vehicle 102 has not been detected by the first vehicle detection device 2a and the predetermined time has passed and it is determined that the timeout has occurred (step S34: YES). , it is considered that the vehicle 102 has not properly moved from the position immediately after passing the gate bar 13, and the gate device 1 judges that there is a problem with the entrance of the vehicle 102, and outputs an alarm by voice, alarm, lamp, or the like. (Step S29).

As described above, according to the present embodiment, the vehicle detection device 2 that detects the vehicle 102 includes the antenna unit 31 that transmits a transmission wave and receives a reflected wave of the transmission wave reflected by an object; and a radome 22 having an inclined surface 22a inclined with respect to a plane perpendicular to the transmission direction of the antenna unit 31 and covering the antenna unit 31.

With such a configuration, the vehicle detection device 2 can detect the transmission wave from the inclined surface 22 a of the radome 22 even when the transmission wave from the antenna section 31 is reflected by the radome 22 due to the influence of rainwater or the like adhering to the outer surface of the radome 22 . , so it is not reflected in the direction opposite to the transmission direction. Therefore, the reflected wave from the radome 22 does not directly reach the antenna section 31, so that it is possible to prevent erroneous detection of the vehicle 102 due to the influence of rainwater or the like. On the other hand, when the transmitted wave transmitted through the radome 22 is reflected by the vehicle 102, the reflected wave reflected in the direction opposite to the transmission direction reaches the antenna unit 31, so that the vehicle 102 can be detected reliably and stably. can be made

Further, in the vehicle detection device 2 according to the present embodiment, the detection area direction adjustment unit 25 allows the antenna unit 31 to adjust the transmission direction of the transmission wave within an adjustment range in which the transmission direction is not orthogonal to the inclined surface 22a. configured to

With such a configuration, the vehicle detection device 2 can be commonly applied to the first vehicle detection device 2a and the second vehicle detection device 2b that transmit radio waves in different directions. In addition, since the transmission direction of the transmission wave can be adjusted while suppressing reflection on the boundary surface of the radome 22, the noise component due to reflection is reduced regardless of the adjustment state of the transmission direction, and the signal detection accuracy is improved.

Further, in the vehicle detection device 2 according to the present embodiment, the antenna section 31 is attached to the flat base 20, and the transmission direction is the direction from the antenna section 31 to one end (for example, the right end) of the base 20. , the angle with respect to the base 20 is adjusted within an adjustment range between a minimum angle substantially parallel to the base 20 and a maximum angle inclined 45 degrees from the minimum angle. The inclined surface 22 a is formed so as to be inclined from a position spaced from the base 20 in the vicinity of the antenna section 31 to a position close to the base 20 at one end of the base 20 .

With such a configuration, even if a long transmission distance of the transmission wave is secured from the antenna portion 31 to the inclined surface 22a in the radome 22, the transmission direction of the transmission wave from the antenna portion 31 is adjusted within the adjustment range β1 to β4 (see FIG. 5). ) can be adjusted. At this time, the incident angles θ1 to θ4 (see FIG. 5) of the transmitted wave with respect to the inclined surface 22a of the radome 22 change, but the reflected wave from the radome 22 is reflected so as not to reach the antenna section 31 directly. As a result, since the dimension from the base 20 to the surface of the radome 22 can be kept short, the vehicle detection device 2 can be formed in a flat (flat) shape. Projection of the vehicle detection device 2 can be suppressed.

For example, the driver of the vehicle 102 entering the entrance road 103 or the exit road 104 tries to bring the vehicle 102 closer to the ticket issuing machine 105 or the fare adjustment machine 106 so that the ticket issuing machine 105 or the fare adjustment machine 106 can be reached. . As shown in FIG. 10, due to the configuration of the entrance lane 103 and exit lane 104, when the vehicle 102 enters the lane while turning left, the vehicle 102 may unintentionally approach the gate device 1. be. In response to such a situation, in the present embodiment, it is possible to easily avoid a collision of an external object (for example, the vehicle 102) with the vehicle detection device 2. It is easy to configure by securing the strength to endure.

The vehicle detection device 2 according to the present embodiment further includes a radio wave absorber 26 attached to the base 20 between the antenna section 31 and one end of the base 20 so as to face the inclined surface 22a.

With such a configuration, it is possible to attenuate reflection of radio waves inside the vehicle detection device 2, reduce noise, and stably detect vehicles.

Further, in the vehicle detection device 2 according to this embodiment, the radome 22 is arranged such that the inclined surface 22a is substantially perpendicular to the road surface.

With such a configuration, the angle of depression in the transmission direction of radio waves from the vehicle detection device 2 is substantially horizontal, and the transmission direction can be arbitrarily variably adjusted with respect to the road surfaces of the entrance road 103 and the exit road 104. , the amount of protrusion of the surface of the radome 22 to the outside can be suppressed. Furthermore, since the surface of the radome 22 is arranged in a state perpendicular to the road surface over the entire area, even if it gets wet with water due to rainfall or the like, it can drop (free fall) without leaving any residual water.

Further, according to the present embodiment, the gate device 1 that regulates the passage of the vehicle 102 entering and leaving the parking lot 101 is provided facing the entrance road 103 and the exit road 104 through which the vehicle 102 passes. A gate housing 10 and the above-described vehicle detection device 2 attached to the gate housing 10 are provided.

With such a configuration, by integrally attaching the vehicle detection device 2 to the gate housing 10 of the gate device 1, the gate device 1 can be installed integrally with the vehicle detection device 2 in the parking lot 101 or the like, so the installation work can be simplified. This simplifies the work involved in the construction and reduces the construction cost.

Further, the gate device 1 according to the present embodiment includes the vehicle detection device 2 described above, and includes the first vehicle detection device 2a for detecting the vehicle 102 before passing through the gate, and the vehicle detection device 2 described above. , and a second vehicle detection device 2b for detecting the vehicle 102 after passing through the gate. The first vehicle detection device 2a and the second vehicle detection device 2b are arranged on two adjacent surfaces 10a and 10b of the gate housing 10 perpendicular to the road surface.

With such a configuration, the structure of the gate housing 10 of the gate device 1 is simple, it can be manufactured at low cost, and the vehicle 102 entering and exiting the lane of the parking lot 101 can be stably detected. Specifically, the gate housing 10 of the gate device 1 can be configured in a substantially rectangular shape in a plan view. can be kept cheap.

In the above embodiment, an example in which the cover 21 and the radome 22 are integrally formed in the vehicle detection device 2 has been described, but the configurations of the cover 21 and the radome 22 are not limited to this example. For example, in another embodiment, the cover 21 and the radome 22 may each be formed in a separate box shape and configured to be individually removable from the base 20 . As a result, the radome 22 can be removed without removing the cover 21, and even with the cover 21 attached, the radar module 24 and the detection area direction adjustment unit 25 are exposed, and the detection area direction adjustment unit 25 can be operated. The transmission direction of the radar module 24 (the direction of the detection area 3) can be adjusted.

In the above embodiment, an example in which the radome 22 is removed and the detection area direction adjustment unit 25 is operated in the vehicle detection device 2 has been described, but the operation of the detection area direction adjustment unit 25 is not limited to this example. For example, in another embodiment, an operation hole (not shown) is provided in the base 20 and the gate housing 10 in the vicinity of the detection area direction adjustment unit 25, and a driver or the like is operated from inside the gate housing 10 through the operation hole. The operation jig may be inserted into the vehicle detection device 2 to operate the detection area direction adjustment section 25 .

In the above-described embodiment, in the gate device 1, an example in which the first vehicle detection device 2a is mounted on the surface 10a of the gate housing 10 facing the entrance road 103 or the exit road 104 has been described. The mounting of the vehicle detection device 2a is not limited to this example.

For example, in another embodiment, as shown in FIGS. 11 and 12, the surface 10a of the gate housing 10 facing the entrance lane 103 or the exit lane 104 is recessed for the first vehicle detection device 2a. A mounting portion 60 is formed. The recessed mounting portion 60 has a size capable of accommodating the entire first vehicle detection device 2a and is recessed in the surface 10a. The first vehicle detection device 2a is mounted in the recessed mounting portion 60 so that the inclined surface 22a of the radome 22 faces outward and the inclined surface 22a of the radome 22 is perpendicular to the road surface.

Note that the recessed mounting portion 60 may configure the mounting portion of the base 20 so that the base 20 of the first vehicle detection device 2a is parallel to the surface 10a, but the inclined surface 22a is parallel to the surface 10a. The mounting portion of the base 20 may be configured as follows. The wall surface of the recessed mounting portion 60 is preferably formed so that the ranges β2 to β4 in the transmission direction toward the first detection area 3a do not interfere with each other when the first vehicle detection device 2a is mounted. It is not limited to being perpendicular to the , but may be formed at an angle. The bottom surface of the recessed mounting portion 60 is inclined downward toward the entrance lane 103 or exit lane 104 . As a result, it is possible to easily drain rainwater in the recessed mounting portion 60 during rainfall, and to suppress snowdrifts from accumulating in the wind and snow.

As described above, according to another embodiment, in the gate device 1, the gate housing 10 is provided with the recessed attachment portion 60 recessed from the plane 10a perpendicular to the road surface, and the first vehicle detection device 2a is , is attached to the recessed mounting portion 60 .

With such a configuration, even when the vehicle 102 approaches the gate device 1 and the front bumper portion of the vehicle 102 contacts and collides with the road surface 10a of the gate device 1 and the corner of the door 11, the second Since one vehicle detection device 2a is housed in the recessed mounting portion 60, direct contact and collision with the vehicle 102 can be avoided. Since the gate housing 10 and the door 11 of the gate device 1 are formed of a high-strength metal material or reinforced plastic such as FRP and are less likely to be damaged, the first vehicle detection device 2a can be protected. Therefore, the radome 22 of the first vehicle detection device 2a does not need to be made thick to ensure strength, and can be made thin. Therefore, since the amount of attenuation of radio waves transmitted through the radome 22 can be reduced, noise is reduced, and the performance of detecting the vehicle 102 can be stably maintained.

Further, in another embodiment, the vehicle detection device 2 has a water gradient on the upper surface of the cover 21 like the second vehicle detection device 2b shown in FIG. do it. As a result, it is possible to prevent rainwater from adhering to the surface of the radome 22 when it rains.

It is also possible to combine at least two characteristic portions among the characteristic portions according to the present invention described above. That is, various characteristic portions described in each embodiment may be combined arbitrarily without distinguishing between each embodiment. Moreover, the various effects described above are only examples and are not limited, and other effects may be exhibited.

In addition, the present invention can be modified as appropriate within the scope not contrary to the gist or idea of the invention that can be read from the scope of claims and the entire specification, and vehicle detection devices and gate devices that involve such modifications are also the present invention. included in the technical concept of

INDUSTRIAL APPLICABILITY The present invention can be suitably used as a vehicle detection device for detecting the entry and exit of a vehicle in self-driving parking lots, tollgates on toll roads, and the like.

1 gate device 1a entrance gate device 1b exit gate device 2 vehicle detection device 2a first vehicle detection device 2b second vehicle detection device 3 detection area 3a first detection area 3b second detection area 10 gate housing 10a Surface facing the road 10b Surface on the far side in the traveling direction 12 Bar holding portion 13 Gate bar 14 Body side substrate 20 Base 21 Cover 22 Radome 22a Inclined surface 23 Main substrate 24 Radar module 25 Detection area direction adjustment unit 26 Radio wave absorption unit 27 Heater 30 Bearing 31 Antenna 33 Holder 40 Control unit 41 Signal input unit 42 External communication unit 43 Gate bar driving unit 50 Control unit 51 Communication unit 52 Vehicle determination unit 53 Signal output unit 55 Control unit 56 Signal generation processing unit 57 Communication unit 60 Recessed Mounting Part 100 Gate System 101 Parking Lot 102 Vehicle 103 Entry Road 104 Exit Road 105 Ticketing Machine 106 Payment Machine

Claims (8)

A vehicle detection device for detecting a vehicle,
an antenna unit attached to a flat plate-like base for transmitting a transmission wave and receiving a reflected wave of the transmission wave reflected by an object;
a radome that covers the antenna section and has an inclined surface that is inclined with respect to the transmission direction of the transmission wave from the antenna section toward one end of the base ;
The inclined surface is a plane inclined from a position spaced from the base in the vicinity of the antenna section to a position close to the base at one end of the base, and is 45 degrees from a line parallel to the plane of the base. A vehicle detection device characterized by being formed at an angle of less than a degree . 2. The vehicle detection device according to claim 1, wherein the antenna unit is configured to be able to adjust the transmission direction of the transmission wave within an adjustment range in which the transmission direction is not perpendicular to the inclined surface. The antenna section is supported at the other end opposite to one end of the base, and the transmission direction is a direction from the antenna section toward one end of the base, and the angle with respect to the base is 3. The vehicle detection device according to claim 2, wherein adjustment is made within an adjustment range between a substantially parallel minimum angle and a maximum angle inclined 45 degrees from said minimum angle. 4. The vehicle detection device according to claim 3, further comprising: a radio wave absorbing part attached to said base so as to face said inclined surface between said antenna part and one end of said base. 5. The vehicle detection device according to any one of claims 1 to 4, wherein the inclined surface is arranged so as to be substantially perpendicular to the road surface. A gate device for regulating passage of vehicles entering and exiting a parking lot through a gate,
a gate housing provided facing a road on which vehicles pass;
A gate device comprising: the vehicle detection device according to any one of claims 1 to 5, which is attached to the gate housing. The gate housing includes a recessed mounting portion recessed from a plane perpendicular to the road surface,
7. The gate apparatus of claim 6, wherein said vehicle detector is mounted in said recessed mounting portion. a first vehicle detection device configured by the vehicle detection device and detecting a vehicle before passing through the gate;
A second vehicle detection device configured by the vehicle detection device and detecting a vehicle after passing through the gate,
8. The apparatus according to claim 6, wherein the first vehicle detection device and the second vehicle detection device are arranged on two adjacent surfaces perpendicular to the road surface in the gate housing. gate device.

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