JPH09325188A - Method and apparatus for sensing infrared ray - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for sensing an infrared ray with excellent reliability by improving the estimating accuracy of the output influence of the first scanning in a method for sensing the ray having the steps of estimating the output influence of first scanning, and estimating the ray change amount at the time of second scanning. SOLUTION: The method for sensing an infrared ray for sensing the ray change amount by intermittently moving a sensor part 2 having an infrared ray sensor comprises the steps of combining at least two of waveform patterns previously stored in a ROM 8 at the time of inspecting a first region by the part 2 to from a first waveform pattern thereby to store it in a memory 13, estimating the output influence of scanning the first region from the first waveform pattern, and predicting the ray change amount at the time of second scanning.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared detecting system and an infrared detecting device for detecting a human body or the like.

[0002]

2. Description of the Related Art In recent years, in order to realize a more comfortable work space such as an office, in addition to physical environmental information of heating elements and air quality elements such as dust, odor, and air composition, human body physiological information of people in the room Has become more important, and human body detection devices using various infrared detection devices for detecting the presence or absence of a person in the room have been developed. Among them, a human body detection device that uses a pyroelectric infrared detection element that reacts to infrared rays emitted from the human body and determines the presence or absence of a person based on the intensity of a set infrared ray incident from a detection area has been put into practical use. . Here, the pyroelectric infrared detection element is an element utilizing the pyroelectric effect in which the surface charge changes when the temperature of the crystal changes due to the incidence of infrared rays. This pyroelectric infrared sensing element is a differential sensing element and does not react to stable infrared radiation, but reacts to changing infrared radiation. Therefore, in order to determine the presence of a stationary human body in the detection area, infrared rays emitted from the stationary human body are intermittently incident on the pyroelectric infrared detection element or the incident amount of infrared rays is changed. There is a need.

Further, an infrared sensor having a pyroelectric infrared detecting element, in order to ensure the detection of the presence or absence of a human body, occupies the ratio of the human body in the sensor visual field to the background of the human body in the sensor visual field, etc. It is necessary to increase the signal-to-noise ratio by increasing the detection output of the human body to be larger than the detection output of the background. For this reason, a method of improving the signal-to-noise ratio by narrowing the sensor field of view of the infrared sensor has been proposed, but if the field of view of the infrared sensor becomes narrow, the detectable range of the human body becomes narrower.
A method has been proposed in which the field of view of an infrared sensor is scanned to expand the detectable range. In this case, even if the human body present within the sensor field of view of the infrared sensor does not move and stands still, the amount of infrared rays incident on the pyroelectric infrared sensing element can be changed, so Can be detected. That is, scanning the field of view of the infrared sensor expands the detectable range of the human body and can also detect a stationary human body, and a human body detection device for scanning the field of view of the infrared sensor is widely put into practical use. ing.

Further, in order to realize a more comfortable warm space, it is also necessary to have information on the location of the human body. At this time, it is difficult to obtain information on the position of the human body by simply scanning the sensor visual field at a constant speed. In order to solve this problem, the sensor field of view is scanned with a scanning pattern having a rotation time and a stationary time, and the first waveform pattern when there is a change in infrared light is stored during the first scanning. Estimate the output effect of the first scan at the time of the scan of the first waveform pattern,
It has been proposed to predict the amount of infrared change during the second scan.

[0005]

However, the sensor field of view is scanned using the conventional scanning pattern having the rotation time and the stationary time, and when the infrared ray changes during the first scanning, the first In the case of storing the waveform pattern, estimating the output influence of the first scanning at the time of the second scanning with the first waveform pattern, and predicting the infrared ray change amount at the time of the second scanning, estimating the first waveform pattern Sometimes it was done with a single waveform pattern as a reference. However, in reality, since the waveform differs depending on the imaging position of the pyroelectric infrared sensor of the heat source (the characteristics inside the pyroelectric infrared sensor are different), there is a problem that the estimation accuracy of the output influence of the first scan is poor. Was.

The present invention solves the above-mentioned problems of the conventional example, and an object of the present invention is to provide an infrared detecting method having excellent reliability by improving the accuracy of estimating the output influence of the first area scanning. And

[0007]

In the infrared detection method of the present invention, there is provided an infrared detection method for intermittently moving a sensor section equipped with an infrared detection element to detect the amount of change in infrared rays. When scanning one area,
A first waveform pattern is formed by combining at least two of the waveform patterns stored in advance in the first storage means and stored in the second storage means, and the first area scan is performed during the second area scan. Is estimated from the first waveform pattern, and the infrared ray change amount during the second scanning is predicted.

According to the present invention, a highly reliable infrared detection method can be obtained by improving the estimation accuracy of the output influence of the first scanning.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is an infrared detection method for intermittently moving a sensor unit equipped with an infrared detection element to detect the amount of infrared change, wherein At the time of area scanning, the first waveform pattern is formed by using at least two of the waveform patterns stored in advance in the first storage means in combination and stored in the second storage means, By estimating the output influence of the first area scan during the area scan from the first waveform pattern and predicting the infrared ray change amount during the second scan, the estimation accuracy of the output influence of the first scan is improved. Can be made.

According to a second aspect of the present invention, among the waveform patterns stored in advance in the first storage means, at least the waveform pattern having the earliest rising edge and the waveform pattern having the latest rising edge are used to form the first waveform pattern. By forming it, the output influence can be estimated by one equation without performing a plurality of cases.

According to a third aspect of the present invention, the acquisition of the waveform influence estimation data stored in the second storage means as the first waveform pattern is performed among the waveform patterns stored in advance in the first storage means. By performing at least two points between the first peak of the slowest rising waveform pattern and the second peak of the fastest rising waveform pattern,
Since the difference between the two waveform patterns can be increased, the estimation accuracy can be improved.

According to a fourth aspect of the present invention, among the data of the first waveform pattern, by storing only the data of the portion for estimating the waveform influence in the storage means, the waveform influence can be estimated with a small amount of data. it can.

According to a fifth aspect of the present invention, a sensor section having an infrared detecting element, an amplifying means for amplifying an output from the sensor section, and an output from the amplifying means are sample-held and converted into digital data. A / D conversion means for
A second storage unit that holds the data from the A / D conversion unit, a first storage unit that stores a plurality of waveform patterns in advance, a scanning unit that moves the sensor unit, and a first area. A first waveform pattern when there is a change in infrared rays incident on the sensor unit during scanning is estimated by combining at least two of the plurality of waveform patterns stored in advance in the first storage means. Stored in the second storage means, the output influence of the first area scanning during the second area scanning is estimated by the first waveform pattern held in the second storage means Since the calculation means for predicting the output is provided, it is possible to provide the infrared detection device in which the estimation accuracy of the output influence of the first scan is improved.

According to a sixth aspect of the present invention, at least two of a plurality of waveform patterns stored in advance in the first storage means are used, that is, the waveform pattern with the fastest response and the waveform pattern with the slowest response. By forming the first waveform pattern, it is possible to provide an infrared detection device capable of estimating the output influence by one equation without distinguishing a plurality of cases.

According to a seventh aspect of the present invention, the acquisition of the data for waveform influence estimation stored in the first storage means as the first waveform pattern is performed by the waveform having the slowest rising edge among the waveform patterns stored in advance. To provide an infrared detection device with improved estimation accuracy because the difference between two waveform patterns can be increased by performing at least two points between the first peak of the pattern and the second peak of the waveform pattern having the earliest rise. You can

According to the invention described in claim 8, among the data of the first waveform pattern, only the data of the portion for estimating the waveform influence is stored in the second storage means, so that the waveform influence is small with a small amount of data. Therefore, it is possible to reduce the capacity of the second storage means to be mounted, so that it is possible to provide a low-cost infrared detection device.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
4 to FIG. (Embodiment 1) FIG. 1 is a block diagram of an infrared detection device according to an embodiment of the present invention. In FIG. 1, 1
Is an infrared detection device, 2 is a sensor unit, and the sensor unit 2 is an infrared detection element (for example, a pyroelectric sensor) that detects infrared rays, an infrared selective transmission plate that selectively transmits predetermined infrared rays, and a Fresnel that collects infrared rays. It has an infrared transmitting lens and the like made of lenses and the like. The infrared detecting element used in the present embodiment is of a type that outputs a predetermined signal when the amount of infrared absorption applied to this element changes.

Reference numeral 3 denotes a scanning unit, which has a rotary shaft 4 to which the sensor unit 2 is fixed and a drive unit for rotating the rotary shaft 4, and the drive unit is controlled by a drive circuit 9. .

Reference numeral 5 denotes an amplifier, which amplifies the output of the sensor section 2. Since an amplifier having both power supplies is used here, positive and negative outputs can be obtained. 6
Is A / D conversion means, and A / D conversion means 6 is amplification means 5
The output from is sample-held and converted into digital data. 8 is an RO that stores data in advance
M and 7 are arithmetic means, and the arithmetic means 7 performs arithmetic operation using data from the A / D conversion means 6 or the ROM 8 or
The D conversion means 6 and the drive circuit 9 are controlled. Here, the output of the sensor unit 2 is always amplified by the amplification unit 5 and input to the A / D conversion unit 6. The A / D conversion unit 6 samples and holds the amplified output at that time in response to the A / D conversion request from the calculation unit 7, and converts the analog data into digital data. Then, the calculation means 7 takes in the digital data. Reference numeral 10 is an output terminal for outputting the infrared detection information determined by the calculation means 7.

The operation of the infrared detector constructed as above will be described below with reference to the drawings.

FIG. 2 is a schematic diagram showing a detection state of infrared rays from a detection area of the infrared detection device according to the embodiment of the present invention, and FIG. 3 (a) shows an infrared detection device according to the embodiment of the present invention. 3 is a time chart showing the scanning time and the angular velocity, and FIG. 3 (b) is a time chart showing the change with time of the output signal of the amplifying means in the embodiment of the invention.
FIG. 3 (c) is a time chart of two patterns of the temporal change of the output signal of the amplifying means in the embodiment of the present invention, and FIG. 3 (d) shows the output signal of the amplifying means in the embodiment of the present invention. FIG. 3 (e) is a time chart of the pattern corrected, and FIG. 3 (e) is a time chart showing the change with time of the difference signal of FIGS. 3 (b) to 3 (d). Also,
Each time in FIG. 3, t _a, t _h and t _m is in rotation start time, t _b and t _i is in rotation stop time, t _f, t _g, t
_k and t ₁ are waveform measurement times for estimating the output influence. t _d is a positive peak time in the S1 region of FIG. 3 (b), and t _j is a negative peak time in the S2 region of FIG. 3 (b).

T _c is S1 of Vcf (t) in FIG. 3 (c)
It is the positive peak time in the region, and t _e is the positive peak time in the S1 region of Vcs (t) in FIG. 3 (c).

In FIG. 2, reference numeral 11 denotes a detected area such as a room, which is composed of three small areas to be detected 11a, 11b, and 11c, and 12 is a human body existing in the substantially center of the detected area 11. Here, it is assumed that the sensor visual field of the sensor unit 2 and the shoulder width of the human body 12 are substantially the same. Human body 1
2 may exist in any detected small area, but in the present embodiment, the case where it exists in the detected small area 11b at the center will be described. In addition, as indicated by the alternate long and short dash line in FIG. 2, the sensor section 2 detects the infrared rays emitted from the detected small area 11a on the right side in the detected area 11 so that the open end of the sensor section 2 is detected. The attitude toward 11a is referred to as a right detection attitude. Further, as indicated by a thin line in FIG. 2, the sensor section 2 detects the infrared rays emitted from the central small detection area 11b in the detection area 11 so that the opening end of the sensor section 2 is set to the small detection area 11b. The attitude that is facing is called the central detection attitude. Further, as indicated by a chain double-dashed line in FIG. 2, the sensor unit 2 detects the infrared rays emitted from the detected small region 11c on the left side of the detected region 11 so that the open end of the sensor unit 2 is detected. The posture facing the area 11c is referred to as a left detection posture. In the detection of the detection area 11, when the sensor unit 2 is scanned from the right detection posture to the center detection posture and further from the center detection posture to the left detection posture, the sensor unit 2 scans from the left detection posture to the center detection posture. In some cases, the sensor unit 2 scans the posture from the center detection posture to the right detection posture, and in the present embodiment, the sensor unit 2 shifts from the right detection posture to the center detection posture.
Further, a case of scanning from the central detection posture to the left detection posture will be described.

First, at the rotation start time t _a , the arithmetic means 7 controls the drive circuit 9 to move the sensor unit 2 from the right detection posture to the center detection posture, so that the sensor unit 2 is rotated. 2 starts to rotate in the direction A shown in FIG. 2 and with an angular velocity ω ₁ and a rotation time t ₁ as shown in FIG.

Next, the sensor visual field of the sensor unit 2 gradually captures a human body present in the small region to be detected 11b as the sensor unit 2 is rotationally scanned in the direction of arrow A in FIG. start. In other words, the occupied area of the human body occupied in the sensor visual field of the sensor unit 2 gradually increases. As a result, the amount of infrared rays detected by the sensor unit 2 increases, and the infrared detection element (not shown) in the sensor unit 2 starts to react to the + side. As a result, the output level of the output signal output from the sensor unit 2 gradually rises, and as shown in FIG. 3B, the output of the amplifying means 5 also rises.

Next, the rotation stop time (or stationary time) t _b
Then, the calculation means 7 controls the drive circuit 9 to stop the rotation operation of the sensor unit 2. At this time, the sensor visual field of the sensor unit 2 completely captures the detected small area 11b, and completely captures the human body 12 existing in the detected small area 11b. It is considered that the output level of the output signal output from the sensor unit 2 is lowered because the infrared amount irradiated to the infrared detection element in the sensor unit 2 does not change due to the sensor unit 2 being in a stationary state. However,
Actually, the output from the sensor unit 2 rises even after the time t _b (hereinafter, this operation is referred to as a delayed output phenomenon).

The reason will be described below. Immediately after the sensor unit 2 stands still, there is no change in the amount of infrared light incident on the infrared detecting element in the sensor unit 2. However, since the infrared sensing element has a heat capacity, thermal equilibrium is not reached immediately after the infrared sensor is at rest. That is, immediately after the sensor unit 2 stands still, the amount of infrared rays absorbed by the infrared detection element is larger than the amount of infrared rays emitted from the infrared detection element. Therefore, the amount of infrared rays substantially changes until the thermal equilibrium state is reached, and the signal output from the sensor unit 2 continues to increase even when the sensor unit 2 is stationary.

After the sensor unit 2 stands still, the output level of the output signal of the sensor unit 2 reaches a peak at a certain rising completion time and then gradually decreases. here,
Time from immediately after there is no change in the intensity of infrared rays input to the infrared detection element in the sensor unit 2 until the rise of the output level is completed (hereinafter, element rise completion time)
Irrespective of the magnitude of the intensity change of the input infrared ray,
It is unique due to the characteristics of the infrared detecting element in the sensor unit 2. The internal characteristics of the infrared detector are not uniform,
Since each infrared detection element is different, the element rise completion time due to the infrared input distribution is different for each infrared detection element. Therefore, the rotation time t ₁ + element rise completion time, which is the rise completion time (hereinafter, sensor rise completion time) of the output of the sensor unit 2 from the rotation start time, also has a different value for each infrared detection element.

Although the characteristic of the amplifying means 5 is linear,
The output of the sensor unit 2 to be inputted are different output rise completion time of the amplifying means 5 (hereinafter, amplification starting completion time) is also arbitrary value (t _d -t _a) time (time t _d is always the same value Absent).

Further, in the amplifying means 5, the sensor rising completion time and the amplification rising completion time are not the same due to the influence of having the frequency characteristic. More specifically, assuming that the sensor rise completion time of the signal output from the sensor unit 2 is 1 second, the amplification rise completion time of the signal output from the amplification unit 5 is about 0.3 seconds. That is, the waveform of the signal output from the sensor unit 2 and the waveform output from the amplification unit 5 have different periods.

Further, here, each rising completion time when the infrared ray irradiation amount to the sensor unit 2 becomes large has been described, but each falling end time when the infrared ray irradiation amount to the sensor unit 2 becomes small. There is a similar relationship regarding time.

Next, when the rotation start time t _h is reached, the computing means 7 controls the drive circuit 9 to move the sensor unit 2 from the central detection posture to the left detection posture so that the sensor unit 2 is rotated. 4 in the direction A shown in FIG. 2 and, as shown in FIG. 3A, the rotation also starts at the angular velocity ω ₁ and the rotation time t ₃ . Here, since the angular velocity and the rotation time in one cycle are the same, the rotation angle of the sensor unit 2 is the same. Sensor section 2
The area occupied by the human body in the sensor field of view of the sensor unit 2 gradually decreases as the rotation of the. As a result, the amount of infrared rays detected by the sensor unit 2 decreases, and the infrared detecting element in the sensor unit 2 begins to react to the-side, and as a result, the output level of the output signal output from the sensor unit 2 is changed. It gradually drops, and as shown in FIG. 3B, the output of the amplification means 5 also drops.

Next, rotation stop time (or stationary start time)
At time t _i , the arithmetic means 7 controls 9 and the sensor unit 2
The rotation operation for changing the position from the central detection posture to the left detection posture is stopped. Here, the occupied area of the human body 12 occupied in the sensor visual field of the sensor unit 2 is substantially zero. As a result,
Only infrared rays from the background of the detection area 11 are incident on the infrared detection element in the sensor unit 2.

At this time as well, the amount of infrared rays incident on the infrared detecting element does not seem to change at first glance, but the output from the sensor unit 2 decreases due to the delayed output phenomenon described above.
After the rotation stop time t _i of the sensor unit 2 has passed, the amplifying means 5
Output level reaches a peak at t _j , and the output level gradually rises.

The waveforms in the S2 and S3 regions of FIG. 3B are
In this state, the influence of the output generated in the area S1 in the figure and the output waveform due to the actual infrared change (hereinafter referred to as the actual waveform) are added. That is, the waveforms of the S2 and S3 regions output from the amplification means 5 are not actual waveforms. As long as the output of the infrared detecting element of the sensor unit 2 is always 0 if the incident amount of infrared rays does not change, the actual output is not affected by the previous output as described above.
Due to the characteristics of the infrared detection element, a waveform is actually output even after the amount of incident infrared rays has stopped changing. FIG. 3 (d)
FIG. 3 is a diagram showing the influence afterwards when an output is generated from the amplification means 5 in the S1 region of FIG. 3B, for example. That is, the influence of the S1 area in FIG. 3B is influenced by S2 and S in FIG.
Since the output is in three regions, subtracting the output in S2 and S3 regions in FIG. 3D from the waveforms in S2 and S3 regions in FIG. 3B results in the S2 and S3 regions in FIG. 3E. Such an actual waveform can be calculated.

Next, a method of calculating the waveform of the first waveform pattern shown in FIG. 3D will be described. The waveform output from the amplifying means 5 is determined by the characteristics of the infrared detection element used in the sensor unit 2. Although this characteristic is different for each infrared detection element, when the output width of each infrared detection element is within the predetermined range, the output waveform of each infrared detection element is stored in the ROM 8 in advance. Waveform obtained from the one that reaches the first peak of this characteristic earliest (V shown in FIG. 3C)
cf (t)) and the waveform (Vcs (t) shown in FIG. 3 (c)) obtained from the one that reaches the first peak most recently. As an actual calculation formula,

[0037]

[Equation 1]

Ve (t) is obtained by here,
A and B are arbitrary values due to the change in the amount of heat in the S1 region shown in FIG. These A and B are obtained by applying the output data of two points at the times t _f and t _g in the S1 region of FIG. 3B to (Equation 1) and making them simultaneous. The time t _f and t _g is the time in principle S1 region is formed, that is, may be present at between t _h from t _a, between these t _a of t _d is the waveform of the change Since the ratio is very large, it is not preferable to use it as data for waveform estimation. On the contrary, the rate of change is small between t _d and t _h , and the rate of change itself is very small, which is a very preferable region for accurate waveform estimation. Therefore t _f
And t _g are preferably between t _d and t _h . Further, the value of A obtained at this time becomes the output peak value due to the change in the amount of heat. In the present embodiment, since the second scanning is performed from t _h , the preferable range is t
Although a t _h from _d, can generally be be between the first peak of Vcs of the second peak of Vcf most constant rate of change, performs accurate waveform estimation Therefore, it is a preferable range.

In the present embodiment, the coefficients A and B are determined by using the two points of t _f and t _g , but a plurality of points may be used. In this case, more accurate waveform estimation can be performed. Furthermore, in the present embodiment, waveform estimation is performed using two waveforms, Vcf and Vcs, but by storing more waveforms in the ROM 8 in advance, Vd using three or more waveforms can be calculated. Prediction is also possible. Also in this case, the waveform can be estimated with higher accuracy.

The first waveform pattern estimated as described above is stored in the memory 13. At this time, as the data stored in the memory 13, not only the data of all the points forming the first waveform pattern but only the portion used for estimating the influence of the waveform should be stored in the memory 13. Since the size of the stored data can be made small, the calculation data for estimating the influence of the waveform can be made small, that is, the calculation time can be shortened, and further, the capacity of the memory 13 can be made small. Can be reduced.

In the present embodiment, since the detected area 11 is divided into three, the rotation operation is performed only twice, but in the case where the detection area 11 is further divided, the rotation operation is performed at time t _m shown in FIG. 3B. Will be performed, and there will be some output (not shown) from the amplification means 5 in the S3 region, which is different from the output shown in FIG. 3B. The actual waveform in the S2 area is shown in FIG.
Since it is known as shown in (e), the time t of this waveform is
A and B of (Equation 1) are obtained from two points of _k and t _l , and conversely, from (Equation 1), output waveforms that have a later influence (see FIG. 3) are obtained.
(E) Waveform of S3 area) is calculated. Therefore, FIG.
If there is a predetermined output in the S3 area shown in (b),
From the measured values, the output of the S3 area in FIG.
The actual value in the S3 area is obtained by subtracting the output of the S3 area in (e).

The generation of FIG. 3E will be described more specifically with reference to FIG. Calculating means 7 detects the rotation starting time t _a, and controls the driving circuit 9 scans the sensor unit 2 from the right side detecting posture by rotation stop time t _b in the central detecting posture. At this time, the calculation means 7 performs, for example, five times A / A near the time t _f.
An A / D conversion request is issued to the D conversion means 6, and the value Vb (t _f ) at time t _f in FIG. This is because the error when there is noise increases in one measurement. Also, for example, at time t _f
By the 100ms later certain time t _g data for the five A / D conversion request to the A / D converter 6 in the vicinity of, obtaining the value Vb (t _g) at time t _g shown in FIG. 3 (b) . From these two values, A and B of (Equation 1) are obtained. ROM8
Is the output waveform of Vcf (t) and Vcs of FIG. 3 (c).
The data of (t) is recorded, and the calculating means 7 stores the data of S2 and S3 of FIG. 3 (d) generated by the calculated A and B and the data of Vcf (t) and Vcs (t) in the memory. Record at 13. Next, the calculating means 7 detects the rotation start time t _h , controls the drive circuit 9, and stops the rotation stop time t _i.
Scans the sensor unit 2 from the central detection posture to the left detection posture. At this time, the calculating means 7 obtains the values Vb (t _k ) and Vb (t _l ) at the times t _k and t _l and records them in the memory 13.

Vb recorded in the memory 13
The time t _k of FIG. 3 (d) recorded in the memory 13 from (t _k )
By subtracting the value Vd (t _k), FIG. 3 obtains a value Ve at time t _k at (e) (t _k), likewise the value Ve of the time t _l
(T _l ) can be obtained. (Equation 1) becomes Ve (t)
The following is a modification (Formula 2) adapted to Here, A ′ and B ′ are arbitrary values due to the change in the amount of heat in S2.

[0044]

[Equation 2]

A'and B'can be _{obtained from} Vd (t _k ) and Vd (t _l ) and (Equation 2).

Peak values A and A'without influence of the previous waveform
This makes it possible to know the amount of change in infrared rays before and after scanning. The calculation means 7 determines that the infrared rays for one human body increase from the peak value A when the right detection posture shifts to the center detection posture, and the peak shifts when the center detection posture shifts to the left detection posture. Since it is determined that the infrared rays are reduced by the same amount as the value A ′, the presence of the human body 12 in the detected small area 11b is detected, and the information is output from the output terminal 10. The same applies when the sensor unit 2 is rotated in the direction indicated by B in FIG.

The flow of processing in the calculating means 7 will be described with reference to FIG. FIG. 4 is a control flowchart of the infrared detection device in the first embodiment of the present invention. First, regarding the S1 region, the time is the rotation start time t _a.
It is determined whether or not (step 4a). If and time is a rotation start time t _a, the rotational direction is determined whether the right direction (step 4b), the right sensor unit 2 by controlling the scanning unit 3 in the drive circuit 9 if the right Direction (from the left detection posture to the center detection posture) (step 4
c) If the rotation direction is not the right direction, the drive circuit 9 controls the scanning unit 3 to rotate the sensor unit 2 in the left direction (from the right detection posture to the center detection posture) (step 4d). Next time determines whether the rotation stop time t _b (step 4e), and controls the driving circuit 9 as long as rotation stop time t _b to stop rotation (step 4f). Next, the time is t
determining whether the _f (step 4g), if the time t _f, the output from the sensor unit 2 controls the A / D converter 6 to convert A / D (step 4h). And A /
It is determined whether the D conversion is performed a predetermined number of times (here, 5 times) (step 4i), and if the A / D conversion is performed a predetermined number of times, Vb (t _f ) data is obtained and recorded in the memory 13. (Step 4j). Thereafter, it is determined whether the time t _g If (step 4k), the time t _g, performs A / D conversion by controlling the A / D converter 6 at step 4l (step 4l). At this time, it is judged whether or not the A / D conversion is performed a predetermined number of times (step 4m), and if it is the predetermined number of times, the data of Vb (t _g ) is obtained and recorded in the memory 13 (step 4n). Next, Vcf (t) and Vcs (t) stored in the ROM 8 in advance, Vb (t _f ) stored in the memory 13 obtained in step 4j and Vb (t _g ) obtained in step 4m Using (Equation 1)
Then, A and B are obtained, and Vcf (t) and Vcs (t)
And the data of Vd (t) is obtained from (Equation 1) and A and B,
It is recorded in the memory 13.

Next, for the S2 region, it is first determined whether or not the time is the rotation start time t _h (step 4p). If the rotation start time t _h , the rotation direction is rightward. If it is in the right direction, the drive circuit 9 is controlled to start rotating the sensor unit 2 in the right direction (center detection posture or right detection posture) (step 4r). Is leftward, the drive circuit 9 is controlled to start rotating the sensor unit 2 leftward (from the center detection posture to the left detection posture) (step 4s). After that, it is determined whether or not the time is the rotation stop time t _i (step 4t), and if it is the rotation stop time t _i , the drive circuit 9 is controlled to stop the rotation of the sensor unit 2 (step 4t). 4u).

Then, it is judged whether or not the time is t _k (step 4v), and if the time is t _k , the A / D conversion means 6
Is controlled to perform A / D conversion (step 4w). At this time, it is judged whether the A / D conversion has been performed a predetermined number of times (step 4x), and if the A / D conversion has been performed a predetermined number of times, Vb
Data of (t _k ) is _obtained (step 4y). Then, it is judged whether or not the time is t ₁ (step 4z), and if the time is t ₁ , the A / D conversion means 6 is controlled to perform A / D conversion (step 4aa). It is judged whether the A / D conversion is performed a predetermined number of times (step 4ab), and the A / D conversion is performed.
If the conversion has been performed a predetermined number of times, Vb (t _l ) data is obtained (step 4ac). Next, let Ve (t _k ) be Ve
(T _k ) = Vb (t _k ) −Vd (t _k ), and Ve (t ₁ ) is obtained by Ve (t ₁ ) = Vb (t ₁ ) −Vd (t ₁ ) (step 4ad). Then, A ′ and B ′ are obtained from Vcf (t), Vcs (t) and Vb (t _k ), Vb (t _l ) and (Equation 1), and human body detection information (where Information about whether or not exists (step 4)
ae). Thereafter, the human body detection information is output from the output terminal 10 to the external device (step 4af). Finally, the rotation direction is set to the opposite direction (leftward if rightward, rightward if leftward) (step 4ag), and the process returns to step 4a.

In the above description, the detection area is divided into three parts so that the right detection posture is moved to the center detection posture and the center detection posture is scanned to the left detection posture. However, no matter how many areas the detected area is divided into, or in which small area the human body exists, the effect of the waveform before the last scan is calculated by the calculation means, and the waveform is calculated. By recording the data in the memory and correcting the data after the amplifying means with the waveform data, it is possible to know the variation amount of the infrared rays before and after the scanning similarly.

In this embodiment, Vb (t _f ), Vb
To obtain the values of (t _g ), Vb (t _k ) and Vb (t _l ), A / D conversion was performed 5 times and the data was obtained. However, if A / D conversion is performed multiple times, noise The impact can be reduced. In the present embodiment, an infrared detection element is provided in the sensor unit.
Although the infrared detecting device provided with each one has been described, the same effect can be obtained even with the infrared detecting device having a plurality of infrared detecting elements in the sensor portion, and the presence or absence and the position of the human body existing in the detected region can be recognized more. . Further, in the present embodiment, the amplifying means of both power supplies is used, but the amplifying means of single power supply may be used.

[0052]

As described above, according to the present invention, there is provided an infrared detecting method for detecting the amount of infrared change by intermittently moving the sensor section provided with the infrared detecting element. At the time of area scanning, a first waveform pattern is formed by combining at least two of the waveform patterns stored in ROM in advance and stored in the memory, and the output of the first area scanning at the time of the second area scanning. By estimating the influence from the first waveform pattern and predicting the infrared ray change amount during the second scanning, the estimation accuracy of the output influence of the first scanning is improved, and the advantageous effect that the reliability is improved. Is obtained.

Further, among the waveform patterns stored in the ROM in advance, at least the waveform pattern having the earliest rising edge and the waveform pattern having the latest rising edge are used to form the first waveform pattern, so that a plurality of cases are not distinguished. Since the output influence can be estimated by one equation, the advantageous effect that the waveform can be estimated in a short time is obtained.

Further, the acquisition of the data for waveform influence estimation stored in the storage means as the first waveform pattern is performed by selecting the waveform having the slowest rising edge from the first peak of the waveform patterns stored in advance. By performing at least two points between the pattern and the second peak, the difference between the two waveform patterns can be increased, so that the estimation accuracy can be improved, and the advantageous effect that the reliability is improved is obtained.

Then, of the data of the first waveform pattern,
By storing only the data of the portion for estimating the waveform influence in the storage means, the waveform influence can be estimated with a small amount of data, so that the advantageous effect that the estimation can be performed in a short time is obtained.

A sensor section having an infrared detecting element, an amplifying means for amplifying an output from the sensor section, an A / D converting means for sampling and holding the output from the amplifying means and converting it into digital data, A storage unit that holds data from the A / D conversion unit, a ROM that stores a plurality of waveform patterns in advance, a scanning unit that moves the sensor unit, and a sensor that enters the sensor unit during the first area scanning. A second area is estimated by combining at least two of the plurality of waveform patterns stored in advance in the ROM and stored in the storage means, and the first waveform pattern when there is a change in infrared rays is stored in the second area. Equipped with arithmetic means for estimating the output of the second scan by estimating the output influence of the first area scan at the time of scanning by the first waveform pattern held in the storage means. More, since the estimation accuracy of the output effect of the first scan can be improved, an advantageous effect of providing an infrared detecting device with improved reliability is obtained.

Further, among the plurality of waveform patterns stored in advance in the ROM, the first waveform pattern is formed by using at least two of the waveform pattern having the fastest response and the waveform pattern having the slowest response, so that a plurality of waveform patterns are formed. Since it is possible to estimate the output influence by one equation without dividing the case, it is possible to provide an infrared detection device that can estimate the waveform in a short time, that is, can provide a short processing time.

Further, the acquisition of the waveform influence estimation data stored in the storage means as the first waveform pattern is performed by selecting the waveform of the waveform pattern having the slowest rising edge from the first peak of the waveform patterns stored in advance. By carrying out at least two points between the pattern and the second peak, the difference between the two waveform patterns can be increased, so that the estimation accuracy can be improved and an infrared detection device with improved reliability can be advantageously provided. The effect is obtained.

Of the data of the first waveform pattern,
Since the waveform influence can be estimated with a small amount of data by storing only the data of the portion for estimating the waveform influence in the storage means, it is possible to reduce the capacity of the mounted memory and thereby reduce the cost. Infrared detector can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram of an infrared detection device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a detection state of infrared rays from a detection area of the infrared detection device according to the embodiment of the present invention.

FIG. 3A is a time chart showing the scanning time and the angular velocity of the infrared detection device according to the embodiment of the invention. FIG. 3B is a time chart showing the change with time of the output signal of the amplification means according to the embodiment of the invention. (C) A time chart of the output signal of the amplifying means according to one embodiment of the present invention, which has two patterns with time. (D) The output signal pattern of the amplifying means according to the embodiment of the present invention is corrected. Time chart (e) Time chart showing changes with time of the signals of the differences in FIGS. 3 (b) to 3 (d)

FIG. 4 is a control flowchart of the infrared detection device according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Infrared detector 2 Sensor part 3 Scanning part 4 Rotating shaft 5 Amplifying means 6 A / D converting means 7 Computing means 8 ROM 9 Driving circuit 10 Output terminal 11 Detected area 11a Detected small area 11b Detected small area 11c Detected Small area 12 Human body 13 Memory

[Procedure amendment]

[Submission date] September 17, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Figure 3

[Correction method] Change

[Correction contents]

FIG. 3 is a diagram showing a temporal change of angular velocity and various signals of the infrared detection device according to the embodiment of the present invention.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location G01V 9/04 A

Claims (8)

[Claims] 1. An infrared detection method for intermittently moving a sensor unit having an infrared detection element to detect an infrared change amount, wherein a first memory is previously stored when the sensor unit scans a first area. A first waveform pattern is formed by using at least two of the waveform patterns stored in the means in combination and stored in the second storage means, and the output of the first area scan at the time of the second area scan. An infrared detection method comprising estimating an influence from the first waveform pattern and predicting an infrared change amount during the second scanning. 2. A waveform pattern having at least the fastest rising edge and a waveform pattern having the slowest rising edge out of the waveform patterns stored in advance in the first storage means,
The first corrugated pattern is formed, wherein
Infrared detection method described. 3. The acquisition of waveform influence estimation data stored in the second storage means as the first waveform pattern is performed from the first peak of the waveform pattern having the slowest rising edge of the waveform patterns stored in advance to the first peak. 3. The infrared detection method according to claim 1, wherein the infrared detection method is performed at least at two points between the second peak of the waveform pattern having a fast rising edge. 4. The infrared detection method according to claim 3, wherein only the data of the portion for estimating the waveform influence of the data of the first waveform pattern is stored in the storage means. 5. A sensor section having an infrared detecting element, an amplifying section for amplifying an output from the sensor section, and an A / D converting section for sampling and holding the output from the amplifying section and converting it into digital data. A second storage unit that holds the data from the A / D conversion unit; a first storage unit that stores a plurality of waveform patterns in advance; a scanning unit that moves the sensor unit; Estimating the first waveform pattern when there is a change in infrared rays incident on the sensor unit during area scanning by combining at least two of the plurality of waveform patterns stored in advance in the first storage means. Then, the second scan is held in the second storage means, and the output influence of the first area scan during the second area scan is estimated by the first waveform pattern held in the second storage means to perform the second scan. of Infrared detection device characterized by comprising a calculating means for predicting a force. 6. The first waveform pattern is formed by using at least two of a waveform pattern having the fastest response and a waveform pattern having the slowest response, out of a plurality of waveform patterns stored in advance in the first storage means. 6. The method according to claim 5, wherein
Infrared detector described. 7. The acquisition of data for waveform effect estimation stored in the second storage means as the first waveform pattern is performed from the first peak of the waveform pattern having the slowest rising of the pre-stored waveform patterns to the first peak. 7. The infrared detection device according to claim 5, wherein the infrared detection device is performed at least at two points between the second peak of the waveform pattern having a fast rise. 8. The infrared detecting apparatus according to claim 7, wherein only the data of the portion for estimating the waveform influence of the data of the first waveform pattern is stored in the second storage means.