JPH0961538A - Object detector and vehicle detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a vehicle detector to detect vehicles with high sensitivity and high accuracy by making the meshes of a protective net longer in the detecting direction of a sensor. SOLUTION: A vehicle entering a parking lot is detected by fitting a platy protective net 19 along the front face of the main body of a vehicle detector and an ultrasonic wave detecting sensor S1 set in a detecting direction 20 on the inside of the net 19 an interval. The opening shapes of a plurality of meshes 22 formed in the protective net 19 are made longer in the detecting direction 20 of the sensor S1 . Therefore, the opening areas of the meshes 22 which are made longer in the direction 20 can be increased and a sufficient amount of signals can be obtained from the sensor S1 even when the fitting angles of the sensor S1 to the net 19 is different from a prescribed angle and the platy surface of the net 19 is deflected from the direction 20. In addition, the sensitivity and accuracy of the signal of the sensor S1 can be improved always in the detecting area 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an object detecting device installed in, for example, an entrance / exit passage of a parking lot, and more specifically to an object detecting device and a vehicle detecting device in which the detection sensitivity and detection accuracy of the sensor are efficiently improved. Regarding

[0002]

2. Description of the Related Art Generally, this type of object detecting device is shown in FIG.
As shown in, a front object of a sensor 71 such as a photoelectric detection sensor or an ultrasonic detection sensor is covered with a protective net 72 to detect a front object.

In this case, the protective net 72 is mounted substantially orthogonal to the detecting direction 75 so that the lattices 74 of the plurality of nets 73 forming the protective net 72 do not interfere with the detecting direction 75 of the sensor 71. As shown in FIG. 8, a sensitive detection area 76 is obtained in front of the protective net 72.

However, as shown in FIG.
When an arrangement is required in which the mounting angle between the protective net 72 and the protective net 72 is different from the fixed position, a grid 74 forming a large number of meshes 73 of the protective net 72 is attached to the sensor 71 as shown in FIG. The non-detection rate that interrupts the signal amount in the detection direction 75 increases, the effective detection area 76 decreases, and there arises a problem that sensor sensitivity and sensor accuracy are reduced.

[0005]

Therefore, the present invention focuses on the mesh opening shape of the protective net which covers the front surface of the sensor, and changes the mesh opening shape to a shape suitable for the sensor performance, whereby the sensor or the protective mesh is formed. It is an object of the present invention to provide an object detection device and a vehicle detection device that can always obtain highly sensitive and highly accurate detection performance regardless of the arrangement direction of the vehicle.

[0006]

According to the first aspect of the present invention,
An object detection device for detecting an object in front of a sensor through a protective net covering the front surface of the sensor, wherein each opening shape of a plurality of nets formed in the protective net is elongated vertically along the detection direction of the sensor. It is characterized in that it is formed in a shape.

The invention according to claim 2 is characterized in that the openings of a plurality of meshes formed on the protective mesh are elongated along the detection direction of the sensor, and the meshes are zigzag. To do.

A third aspect of the present invention is a vehicle detection device equipped with such an object detection device to detect a vehicle.

[0009]

According to the present invention, the opening shape of each of the plurality of meshes formed in the protective mesh is made vertically long so as to be elongated along the detection direction of the sensor to protect the front surface of the sensor. Also,
The protective mesh is opened in a zigzag pattern to cover the front surface of the sensor.
Further, the vehicle detection device is equipped with an object detection device having such a protection network to detect the vehicle.

[0010]

As a result, even if the mounting angle of the sensor or the protective net is different, the opening area of the mesh that is long in the detecting direction can be wide, so that the mounting angle of the sensor or the protective net is not fixed. The signal quantity of the sensor is not largely blocked by the mesh grid, and the signal quantity in the detection direction can be sufficiently secured. As a result, the sensor can obtain high-sensitivity and high-precision detection performance.

When the meshes are opened in a zigzag pattern in addition to being elongated in the detection direction, the signals in the detection direction can be averaged and detected without being biased in a single line in the vertical and horizontal directions. Even if the position shifts, a change error in the detection direction can be suppressed to be small, and more stable sensor sensitivity and sensor accuracy can be obtained.

Therefore, if the vehicle detection device is installed at a position such as an entrance and exit passage of a parking lot that is easily affected by external influences, the vehicle can be accurately detected.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. 1 and 2 show a parking ticket issuing machine 11 installed in an entrance passage of a parking lot. The parking ticket issuing machine 11 has a storage time indicator 13 and a parking commuter ticket insertion opening 14 on an upper front surface of a device body 12. , Ticketing button 15 and call button 1
6 and a vehicle detection device 17 on the lower front surface of the device body 12.

As shown in FIG. 3, the vehicle detection device 17 is provided with a flat plate-shaped protective net 19 along the front wall surface 18 of the main body 11 of the device, and the detection direction 20 is provided at an inner position separated by the protective net 19. , 21 left and right ultrasonic detection sensors S
1 and S2 are attached and the vehicle C used for warehousing is detected.

In this case, as shown in FIG.
Each of the openings of the plurality of meshes 22 ... Formed in the above is formed in a vertically long shape with a long opening along the detection direction 20 of the ultrasonic detecting sensor S1.

As a result, as shown in FIG. 5, the mounting angle of the ultrasonic detection sensor S1 or the protective net 19 is different from the fixed position, and the detection direction 20 of the sensor S1 and the flat net surface of the protective net 19 are different from each other. Even if it corresponds to the tilt direction, the detection direction 20
Even if the sensor S1 and the protective mesh 19 are not fixed at fixed positions, the signal amount of the sensor S1 is large due to the grid 23 of each mesh 22 ... It is not obstructed, and the amount of signal in the detection direction can be secured. As a result, the sensor signal in the detection area 24 can always obtain a highly sensitive and highly accurate detection performance.

FIG. 6 shows another embodiment of the present invention, in which each opening shape of a plurality of meshes 62 formed in a protective net 61 is elongated along the detection direction 63 of the ultrasonic detecting sensor S1. Formed into a vertically long shape, and these meshes 6
2 ... are formed by opening in a staggered arrangement.

In this case as well, it is possible to secure a sufficient amount of signal in the detection direction. Further, the grids 64 ... Are also staggered based on the zigzag array of the meshes 62, and the non-detection ratio of the grids 64 ... A stable sensor signal can be obtained at. Therefore, even if the shield area of the sensor signal by the grating 64 is slightly increased, the detection direction 63
The signals of can be averaged and detected. Therefore, even if the ultrasonic detection sensor S1 or the protective net 61 is misaligned, a change error in the detection direction 63 can be suppressed to be small, and stable sensor sensitivity and sensor accuracy can be obtained.

Therefore, if the vehicle detection device 17 having such a structure is arranged at a position where the degree of freedom in the sensor mounting direction is widened and the external influence such as the entrance passage of the parking lot is easily received, it is possible to use the storage device. The vehicle C that runs can be accurately detected.

As described above, even if the mounting angle of the ultrasonic detecting sensor or the protective net is different, the opening area of the mesh that is long in the detection direction can be wide, so the mounting angle of the sensor or protective net is not fixed. However, the signal amount of the sensor is not largely blocked by the mesh grid, and the signal amount in the detection direction can be sufficiently secured. As a result, the sensor can obtain highly sensitive and highly accurate detection performance. Also, when the mesh is opened in a staggered pattern in addition to being long in the detection direction, the ratio of blocking the signals in the detection direction can be averaged and detected without being biased to one vertical and horizontal row. Even if there is a deviation, a change error in the detection direction can be suppressed to be small, and more stable sensor sensitivity and sensor accuracy can be obtained.

In the correspondence between the present invention and the configuration of the above-described embodiment, the object detecting device of the present invention corresponds to the vehicle detecting device 17 of the embodiment, and hereinafter, similarly, the sensors are ultrasonic detecting sensors S1 ,. Although the object corresponds to S2 and the object corresponds to the vehicle C, the present invention is not limited to the configuration of the above-described embodiment.

[Brief description of drawings]

FIG. 1 is a front view showing a parking ticket issuing machine of the present invention.

FIG. 2 is a side view showing the parking ticket issuing machine of the present invention.

FIG. 3 is a cross-sectional view of a main part of the vehicle detection device of the present invention.

FIG. 4 is an enlarged perspective view of essential parts showing a protective net of the vehicle detection device of the present invention.

FIG. 5 is an explanatory view showing a detection state of the vehicle detection device of the present invention.

FIG. 6 is an explanatory diagram showing a detection state of a vehicle detection device according to another embodiment of the present invention.

FIG. 7 is an enlarged perspective view showing a proper use state of a protective net of a conventional object detection device.

FIG. 8 is an explanatory diagram showing a proper detection state of a conventional object detection device across a protective net.

FIG. 9 is an enlarged perspective view showing an unsuitable usage state of a protective net of a conventional object detection device.

FIG. 10 is an explanatory diagram showing an unsuitable detection state of a conventional object detection device across a protective network.

[Explanation of symbols]

 11 ... Parking ticket issuing machine 17 ... Vehicle detecting device 19, 61 ... Protective network 20, 21, 63 ... Detecting direction 22, 62 ... Mesh 23, 64 ... Case 24, 65 ... Detection area S1, S2 ... Ultrasonic detection Sensor C ... Car

Claims (3)

[Claims] 1. An object detecting device for detecting an object in front of a sensor through a protective net covering a front surface of the sensor, wherein each opening shape of a plurality of nets formed in the protective net is detected in a detection direction of the sensor. Object detection device formed in a vertically long shape with a long opening along the edge. 2. The protective mesh is opened in a zigzag pattern.
The object detection device according to claim. 3. A vehicle detection device for detecting a vehicle, comprising the object detection device according to claim 1.