JPH04339282A - Object detector - Google Patents

Abstract

PURPOSE:To precisely detect the entrance and exit of an object for a specified region by combining a passive sensor for detecting the object which has entered a wide region and an active sensor for detecting the entrance of the object. CONSTITUTION:A human organism 6 positioned in a wide region is detected by a passive sensor 1 (pyroelectric sensor 11) and further the organism 6 who has entered a narrow region therein by an active sensor 2 (LED2, SPD23). In the case where the organism 6 enters the wide region and comes in the narrow region within a specified time, a detection signal 9 is output as soon as the organism 6 enters the specified region by the use of a signal processing means 3, for instance, the operation part of ATM makes its operation possible. As long as the detection signal S4 is output by the use of a sensor 2, a signal S9 is continued to output by the use of the processing means 3 even after a detection signal S1 from the sensor 1 is lost, and the output of the signal S9 stops as soon as the organism 6 exits when the signal S4 is lost. When a signal S1 is output by the use of the sensor 1, drive power is supplied to another sensor 2 with the use of the processing means 3.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is an automatic teller machine (ATM).
), relates to an object detection device that detects an object such as a human body approaching an operating device such as a cash dispenser (CD), and in particular, an object detection device that performs highly reliable object detection by combining a passive sensor and an active sensor. Regarding equipment.

0002

2. Description of the Related Art In ATMs and the like, from the viewpoint of reducing power consumption, it is desired to utilize the power of operating devices such as displays only when a user approaches the ATM. To do this, it is necessary to accurately detect when a user approaches an ATM.

Various active or passive sensors have been used as sensors for detecting human bodies. Infrared sensors, pyroelectric sensors, and the like are known as passive sensors, and sensors that combine LEDs and photodiodes are known as active sensors.

0004

[Problem to be solved by the invention] However, when these sensors are used alone, there are advantages and disadvantages to each, and it is difficult to reliably detect when an object such as a human body enters or exits a certain area. I'm running into a problem where I can't. Therefore, an object of the present invention is to provide a device that accurately and reliably detects whether an object has entered or exited a predetermined area.

[0005]

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a passive sensor that detects an object entering a wide area, and an active sensor that detects an object entering a narrow area within the wide area. The idea is to combine this technology with sensors to accurately detect when an object enters or exits a narrow area. That is, the object detection device of the present invention includes a passive sensor that detects radiation from an object located in a wide range, an active sensor that detects reflected light from an object located in a narrow range included in the wide range, and a passive sensor. A signal processing means is provided for outputting a signal indicating the presence of an object when the detection signal of the active sensor is present within a predetermined time from generation of the detection signal. Further, the signal processing means stops outputting a signal indicating the presence of an object when the detection signal of the active sensor is lost. Preferably,
After the passive sensor system is activated, the active sensor system is activated.

[0006]

[Operation] A passive sensor covers the presence of an object located within a wide area, and an active sensor different from the passive sensor detects an object that has entered a narrow area within the wide area. Then, when the object enters the wide area and enters the narrow area within a predetermined time, the signal processing means outputs a detection signal indicating that the object has entered the narrow area. An active sensor outputs a detection signal as long as an object exists within its narrow area. Therefore, even after the signal from the passive sensor is lost, as long as the detection signal from the active sensor exists, the signal processing means continues to output the detection signal assuming that the object exists in the narrow area, and the signal processing means continues to output the detection signal as long as the detection signal from the active sensor exists. When the detection signal is lost, it is assumed that the object has come out of that narrow area, and the output of the detection signal is stopped. Passive sensors operate using radiation from objects and do not require a power supply. On the other hand, active sensors require a power supply to drive them. Therefore, when the passive sensor covers a wide area and first outputs a detection signal, the signal processing means supplies power to the active sensor. This reduces power consumption for the active sensor.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a circuit configuration diagram of an object detection device applied to an ATM as an embodiment of the object detection device of the present invention. In this ATM object detection device, in order to detect a human body 6, a pyroelectric sensor system 1, an optical sensor system 2, a signal processing circuit 3, and a drive transistor 4 are connected as shown. Pyroelectric sensor system 1 as a passive sensor
is composed of a pyroelectric sensor 11 and an amplification/comparison circuit 12 for the pyroelectric sensor. The optical sensor system 2 as an active sensor includes an infrared light emitting diode (LED) 2
1, silicon photo diode (SPD) 23, LED driver/oscillator 22 that drives the infrared LED 21
, an amplifier 24 for amplifying the output signals from the SPD 23, and a gate circuit 25 are connected as shown. The signal processing circuit 3 includes a first timer 31 and a second timer 3.
2, AND gate 33, and set/reset type (
R-S) flip-flops 34 are connected as shown.

As shown in FIGS. 2(a) and 2(b), ATM
A pyroelectric sensor 11 that generates an instantaneous pulse signal in response to infrared rays emitted by a human body 6 approaching 5 covers a wide pyroelectric sensor detection area Z1, and transmits infrared rays from an infrared LED 21 to the human body 6. Project the reflected wave to SPD2
3 receives the optical sensor system 2 in the pyroelectric sensor detection area Z
Optical sensor detection area Z2 is a narrow area included in 1.
to cover. As an example of this ATM object detection device, the optical sensor detection distance L2 is 50 to 80 cm, the pyroelectric sensor detection distance L1 is 1 to 2 m, and the vertical height H of the optical sensor system 2 (floor surface (to the bottom of the ATM5 operation panel) is approximately 60 cm.

As shown in FIG. 3, the optical sensor detection area Z2 includes an LED cover area Z21 where the infrared LED 21 emits infrared rays, and an SPD area where the SPD 23 can receive reflected waves.
This area overlaps with the PD cover area Z23.

The pyroelectric sensor 11 also includes a pair of pyroelectric elements 11a and 11a made of LiTaO3, as shown in FIG. 4(a).
11b are placed adjacent to each other, and these pyroelectric elements are connected with opposite polarities as shown in FIG. 4(b) for differential operation.
It is configured to compensate for the ambient temperature as background noise existing in the pyroelectric sensor detection area Z1. The differential output is amplified via the FET and output to the pyroelectric sensor amplification/comparison circuit 12. The pyroelectric sensor system 1 and the optical sensor system 2 are installed at substantially the same position in the ATM 5, and the signal processing circuit 3 and the drive transistor 4 are installed inside the ATM 5.

[0011] The operation of the above-mentioned ATM object detection device is as follows.
This will be described with reference to the signal timing diagram in FIG. 5 and the human body flow trajectory in FIG. At time t1, when the human body 6, which is a user, enters the pyroelectric sensor detection area Z1, the pyroelectric sensor 11 responds to the infrared rays emitted from the human body 6 and outputs a pulse signal S1. This pulse signal S1 is amplified by the pyroelectric sensor amplification/comparison circuit 12 and compared with a threshold value, and when the threshold value is exceeded, the pyroelectric human body detection pulse signal S3 is output from the pyroelectric sensor amplification/comparison circuit 12. Output. 1st
The timer 31 outputs a "high" level first time signal S5 at the rising edge of this pyroelectric human body detection pulse signal S3, starts time counting, and when the first time T1 elapses, the first time limit starts. The signal S5 is set to "low" level. This first
The time T1 is 1 minute in this embodiment. Note that the first timer 31 receives the pyroelectric human body detection pulse signal S3.
Each time is input, the first time limit signal S5 is continued to be output, and the above-mentioned time counting is restarted from the beginning. Therefore, as long as the human body 6 enters the pyroelectric sensor detection area Z1 and there is a change in its movement, infrared rays are emitted from the human body 6, and a pyroelectric human body detection pulse signal S3 is output each time. In this embodiment, the optical sensor system 2 is constantly operating, but the human body 6
SP does not enter the optical sensor detection area Z2.
The optical human body detection signal S2 is not output from D23.

[0012] If, as shown in the flow line trajectory C1, the human body 6
from the wide area Z1 to the narrower optical sensor detection area Z
2, the infrared rays emitted from the infrared LED 21 are reflected by the human body 6, the reflected waves are received by the SPD 23, and the SPD 23 outputs an SPD human body detection signal S2. The infrared LED 21 is an LED driver/oscillator 22
A predetermined oscillation frequency (oscillation period), for example, 1
It is continuously energized in seconds, and the output light of the infrared LED 21 is a continuous pulse. Therefore, the reflected light also becomes a pulse signal, and the SPD human body detection signal S from the SPD23
2 is also a pulse signal. The SPD human body detection signal S2 is amplified by an amplifier 24. The output of the amplifier 24 is transmitted to the gate circuit 25 by the LED driver/oscillator 22.
While the ED21 is energized, it is gated by a gate signal that is at a "high" level, and the optical human body detection signal S4 is activated.
is output as This gate processing is performed using two infrared LEDs.
This is to enable the detection output of the SPD 23 only when the LED 1 is energized, and to prevent the optical human body detection signal S4 from being output due to noise when the infrared LED 21 is not operating. When this optical human body detection signal S4 is input to the second timer 32, the second timer 32
A 2-1 time signal S6 at a "high" level and a 2-2 time signal S7 having a polarity opposite to that of the 2-1 time signal S6 are output. These 2-1st time signal S6 and 2-2nd time signal S7 are optical human body detection signal S4
After a predetermined time (second time T2) longer than 1 second has elapsed since the oscillation period of the infrared LED 21 was lost, for example, 5 seconds later, at time t3, the oscillation period of the infrared LED 21 becomes "low" level and "high" level, respectively. become.

As shown by the broken line, the first time signal S5 needs to be at a "high" level at least when the 2-1 time signal S6 is at a "high" level. The solid line in FIG. 5 shows an example of a "high" level until time t3 and thereafter. While the first time signal S5 is at a "high" level, the second time signal S5 is at a "high" level.
When the first time signal S6 becomes "high" level, the logical product (AND) of the first time signal S5 and the second-first time signal S6 in the AND gate 33 becomes "1", and the "high" level becomes "high" level. AND output S8 is R-S flip-flop 3
It is applied to the set terminal S of No. 4 to set the R-S flip-flop 34. This R-S flip-flop 34
By setting , a "high" level drive output signal S9 is applied from the Q output terminal to the base of the drive transistor 4,
The drive transistor 4 is turned on, and a current flows from the collector C to the emitter E, operating a subsequent circuit connected to the collector C, such as a solenoid coil. By energizing the solenoid coil, the ATM
The power to the operating parts including the CRT etc. in 5 is turned on, and the operating parts become operable. That is, when the human body 6 enters the optical sensor detection area Z2 from the pyroelectric sensor detection area Z1,
The above-mentioned operation part becomes operable only when the front surface of TM5 is reached.

As shown in the flow line trajectory C1 in FIG. 6, when the human body 6 that was in the optical sensor detection area Z2 leaves the optical sensor detection area Z2 and the optical human body detection signal S4 is lost, the second After the second time T2 has elapsed, for example, 5 seconds, the timer 32 sets the 2-1st time limit signal S6 to the "low" level and sets the 2-2nd time limit signal S7 to the "high" level. The fact that the 2-2nd time signal S7 has become a "high" level indicates that the human body 6 has deviated from the optical sensor detection area Z2. Since the 2-2nd time signal S7 is input to the reset terminal R of the RS flip-flop 34, the RS flip-flop 34 is reset. This turns off the drive transistor 4. As a result, the solenoid coil downstream of the drive transistor 4 is also deenergized, and power supply to the operating portion is stopped.

The case where the human body 6 normally enters the pyroelectric sensor detection area Z1 and the optical sensor detection area Z2 has been described above, but the signal waveform at time t5 in FIG. 5 is the pyroelectric human body detection pulse. A case is shown in which the SPD human body detection signal S2 and the optical human body detection signal S4 are generated without the signal S3 being generated. Since such a form is not a normal approach of the human body 6 to the ATM 5, the "high" level signal S8 is not output from the AND gate 33, and the R-S flip-flop 34 is not output.
is not set.

Further, as shown in the flow line trajectory C2 in FIG. 6, the human body 6 enters the pyroelectric sensor detection area Z1, and the pyroelectric human body detection pulse signal S3 is output (not shown) Even if the human body 6 does not enter the optical sensor detection area Z2 while the human body detection pulse signal S3 is at the "high" level and the optical human body detection signal S4 is not output, the R-S flip-flop 3
4 is not set.

On the other hand, at time t6 in FIG. 5, the pyroelectric human body detection pulse signal S3 is output, and within the first time T1,
If the optical human body detection signal S4 is output at time t7, even if the first time signal S5 becomes a "low" level, the AND gate 33 outputs a "high" level signal during the period t7 to t8. Since S8 is output, R-
The S flip-flop 34 continues to be set and the drive transistor 4 continues to be turned on. And the human body 6 is A
After the optical human body detection signal S4 becomes "low" level after moving away from TM5, the second -
The "high" level of the time signal S6 of 1 continues, and the time t9
In this case, the 2-2nd time limit signal S7 becomes "high" level and resets the R-S flip-flop 34, which is the same as the normal operation described above.

As described above, the optical sensor system 2, which is a passive sensor, is combined with the optical sensor system 2, which is an active sensor. By setting the range, it is possible to accurately detect the human body 6 that sequentially moves from the pyroelectric sensor detection area Z1 to the optical sensor detection area Z2. Then, power is supplied to the operating part of the ATM 5 only while the human body 6 is operating the ATM 5 in front of the ATM 5.
power consumption is significantly reduced.

In the above embodiment, the optical sensor system 2 is also kept operable at all times. However, due to the relationship between the pyroelectric sensor detection area Z1 and the optical sensor detection area Z2, under normal conditions, , the pyroelectric sensor system 1, which is a passive sensor, operates first, and then the optical sensor system 2, which is an active sensor, operates. Therefore, after the pyroelectric sensor system 1 detects the human body 6, the optical sensor system 2 may be activated. Then, the power supply to the optical sensor system 2 is reduced. The power reduction of the optical sensor system 2 is achieved because the installation location of the signal processing circuit 3 and the installation locations of the optical sensor system 2 and the pyroelectric sensor system 1 are very far apart, and the detection signal and the detection signal of the optical sensor system 2 are transmitted wirelessly. This is a system that sends the detection signal of the pyroelectric sensor system 1 to the signal processing circuit 3 side, and power cannot be supplied from the signal processing circuit 3 to drive the optical sensor system 2. This is particularly effective in extending the life of the battery for driving the optical sensor system 2 in systems where the optical sensor system 2 is driven by a battery.

[0020] When implementing the object detection device of the present invention,
In addition to those described above, various modifications can be made. For example, the processing of the signal processing circuit 3 in FIG.
This can be done using a computer system that performs various arithmetic and control processes within the system, or a dedicated control microcomputer. Moreover, instead of the pyroelectric sensor system 1 as a passive sensor and the optical sensor system 2 as an active sensor, various other sensors can be used. Examples of such sensors include an infrared sensor as a passive sensor and an ultrasonic sensor as an active sensor. In such a combination of sensors, it is preferable to widen the area covered by the passive sensor and narrow the area covered by the active sensor. In addition, in the above embodiments, the case where the object detection device of the present invention is applied to an ATM was described as an application example, but when implementing the present invention, the object detection device of the present invention can be applied not only to an ATM but also to a C
D, or other various devices or systems such as security systems that detect objects that are separated into a wide area and a narrow area and sequentially move through these areas. In such a system, as described above, the pyroelectric sensor system 1 and the optical sensor system 2 may be installed at a remote location from the signal processing circuit 3, and wirelessly connected therebetween.

[0021]

[Effects of the Invention] As described above, according to the object detection device of the present invention, two types of different types of sensors are used, and these sensors monitor a wide area and a narrow area included in the area. This enables highly reliable object detection. Since this object detection signal is output while the object exists in a narrow area, the object detection device of the present invention is applied to ATMs, CDs, etc., and the inside of the device is output only while the object (user) exists in the narrow area. It becomes possible to supply power to the operating parts, and the power consumption of such devices can be reduced. In addition, the power consumption of the active sensor can be significantly reduced by covering a wide area with the passive sensor, covering a narrow area with the active sensor, and activating the active sensor after the passive sensor is activated.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an object detection device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing the object detection method of FIG. 1;

FIG. 3 is a diagram showing a detection area of the optical sensor system of FIG. 1;

FIG. 4 is a diagram showing a circuit configuration of the pyroelectric sensor system of FIG. 1.

FIG. 5 is a diagram showing the operation timing of the signal processing circuit in FIG. 1;

FIG. 6 is a diagram showing detection logic of the object detection device of FIG. 1;

[Explanation of symbols]

1. Pyroelectric sensor system, 2. Optical sensor system, 3. Signal processing circuit, 4. Drive transistor, 5. ATM,
6. Human body, 11. Pyroelectric sensor, 12. Pyroelectric sensor amplification/comparison circuit, 21. Infrared LED, 22.
・LED driver/transmitter, 23...SPD, 24...
Amplifier, 25...gate circuit, 31...first timer,
32...Second timer, 33...AND gate, 34...
・R-S flip-flop, Z1...Pyroelectric sensor detection area, Z2...Optical sensor detection area, Z21・LE
D cover area, Z22...SPD cover area.

Claims (3)

[Claims] Claim 1: A passive sensor that detects radiation from an object located in a wide range, an active sensor that detects reflected light from an object located in a narrow range included in the wide range, and a detection signal generation of the passive sensor. and signal processing means for outputting a signal indicating the presence of an object when a detection signal from the active sensor is present within a predetermined time period. 2. The object detection device according to claim 1, wherein the signal processing means stops outputting the signal indicating the presence of the object when the detection signal of the active sensor is lost. [Claim 3] After the passive sensor system operates,
The object detection device according to claim 1 or 2, wherein the active sensor system is operated.