JPH08327317A - Heat source detector - Google Patents

Abstract

PURPOSE: To provide a highly sensitive and inexpensive heat source detector in a simple constitution which can widen the detection area. CONSTITUTION: An infrared sensor 9 having a plurality of infrared detection elements is arranged and fixed, and a signal-processing part for processing infrared detection signals of the sensor is provided. An infrared light reflection mirror 6 is installed via an infrared lens 10 on the side of a photodetecting surface 16 of the infrared sensor 9. Infrared rays entering the reflection mirror 6 through an infrared transmission window 4 are reflected at the reflection mirror and form an image on the photodetecting surface 16 of the infrared sensor 9 by the infrared lens 10. The infrared light reflection mirror 6 is axially supported to be rotatable in a direction in which the infrared sensor 9 scans a detection area. When the infrared rays entering the reflection mirror 6 are introduced to the infrared sensor 9 while the infrared light reflection mirror 6 is rotated by a motor 13, the detection area by the infrared sensor 9 is changed equivalently. Data of a heat source from the entire periphery of the detector is detected in this manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat source detecting device for detecting the position of an infrared heat source such as a human body and the moving direction of the heat source position.

[0002]

2. Description of the Related Art Radiant light (infrared rays) from an infrared heat source such as a human body is detected by an infrared sensor. The detection of the heat source by the infrared sensor is a passive method such as detecting the radiant light naturally emitted from the heat source without irradiating the human body to be measured with any light. It is widely applied because it has no adverse effect on the heat source and can detect a heat source at night without lighting.

In particular, in the field of home appliances and crime prevention, a heat source detecting device using a thermal infrared sensor, which can operate at room temperature and can passively detect infrared rays and is inexpensive, is considered promising. There is. Of the thermal infrared sensors, the one with the highest sensitivity is the pyroelectric sensor, but this pyroelectric sensor does not change the infrared intensity because it is a sensor that detects changes in the incident infrared intensity. Various measures are required to detect a heat source in a stationary state. Therefore,
For example, as shown in FIG. 6, there has been proposed a heat source detection device provided with a chopper 11 for intermittently blocking infrared rays incident on a pyroelectric infrared sensor 9.

The one shown in FIG. 6 is disclosed in Japanese Unexamined Patent Publication No. 6-10208.
This is proposed in Japanese Patent Publication No. 8 and, by rotating the blade-shaped chopper 11 by a motor (not shown), incident light of infrared rays incident on the infrared sensor 9 through the infrared lens 10 is intermittently supplied. It is designed to shut off. The timing of blocking the infrared incident light by the chopper 11 is detected by the photo interrupter 41 having the light emitting element 39 and the light receiving element 40.

FIG. 7 shows another example of the heat source detecting device for intermittently blocking the infrared rays by the chopper 11. This device is proposed in Japanese Patent Publication No. 63-170729, and a slit type shield plate 43 having a slit 44 constitutes a chopper.
Is moved in the vertical direction in the figure by the bimorph vibrator 42, and the infrared sensor 9
The infrared incident light incident on is interrupted intermittently.

FIG. 8 shows still another example of the heat source detecting device. This device is proposed in JP-A-6-229824, in which the infrared lenses 10 are collectively arranged in a dome shape, and the field of view of each infrared lens 10 is sequentially selected by a cylindrical chopper 11. This makes it possible to obtain information on the heat source distribution in the detection area (the detection area of the infrared sensor 9) corresponding to the selected infrared lens 10.

FIG. 9 shows still another example of the heat source detecting device using an infrared sensor. This device is proposed in Japanese Patent Laid-Open No. 6-94532.
An infrared sensor 9 in which eight pyroelectric infrared detection elements are arranged in a vertical line is provided so as to be reciprocally rotatable as indicated by an arrow B in the figure, and an infrared lens 10 is provided on the outer peripheral side of the infrared sensor 9. Provided,
A chopper 11 having an opening (not shown) on the outer peripheral side thereof
Is provided.

In this apparatus, radiant light (infrared ray) from a heat source is incident on the infrared lens 10 through the opening of the chopper 11, and the infrared ray is condensed by the infrared lens 10 to form an image on the infrared sensor 9. However, the infrared sensor 9 is rotated by the stepping motor 30 as shown by the arrow B in the figure, and the chopper
By opening and closing 11 times 64 times to detect radiant light,
The radiant light is detected while changing the detection angle. And
The detection signal is processed by the signal processing unit, and the CPU
The (Central Processing Unit) projects a 64 × 8 infrared image as shown in the figure to detect the heat source position and the heat source moving direction.

According to the heat source detecting device as shown in FIGS. 8 and 9, since the detection area of the infrared sensor 9 can be widened, the heat source detecting device has been recently demanded from home appliances and crime prevention fields. There is a demand for a wide angle detection area (for example, when the device is installed in an air conditioner, a minimum of 130 °
It is necessary to have more than a certain field of view).

[0010]

Although various types of heat source detection devices such as those described above have been conventionally proposed, there have been various problems as described below. For example,
In the heat source detection device of the type as shown in FIGS. 6 and 7, it is necessary to capture the infrared detection signal of the infrared sensor 9 and perform signal processing after a certain time has elapsed since the chopper 11 was opened. In addition, it is necessary to detect the opening / closing timing of the chopper 11 and synchronize the timing with the reading timing of the infrared detection signal. For example, an opening / closing detection element of the chopper 11 such as the photo interrupter 41 shown in FIG. 6 is required. However, there is a problem that the configuration of the heat source detection device becomes complicated.

As shown in FIG. 8, the infrared lens 10
In the heat source detection device where the
Although a field of view of about 180 ° is secured, in such a device, the angles (infrared incident angle) with respect to the infrared receiving center axis C orthogonal to the light receiving surface 16 of the infrared sensor 9 are collectively arranged infrared lenses. There is a problem in that the infrared light receiving sensitivity changes because the lenses on both ends of 10 become larger.

Further, in the heat source detecting device as shown in FIG. 9, a field of view of 180 ° can be obtained by rotating the infrared sensor 9 by 180 °, for example. Due to the wiring of the wire (not shown), it is necessary to repeat the operation of rotating it 180 degrees and then rotating it in the opposite direction and rotating it back to the original state. However, there is a problem that the control mechanism for performing is complicated. In addition,
In order to avoid providing a complicated control mechanism for performing rotation while switching the rotation direction, in order to keep the infrared sensor 9 rotating in a fixed direction, the infrared detection signal is taken out while twisting the signal line. Therefore, it is necessary to provide a mechanism such as a slip ring, which complicates the device configuration as described above.

Further, in the heat source detecting device for taking out the infrared detection signal while rotating the infrared sensor 9 as shown in FIG. 9, the influence of vibration due to the rotation of the infrared sensor 9 itself adversely affects the infrared detection signal of the infrared sensor. There is also a problem that the reliability of the infrared detection accuracy of the infrared sensor 9 is deteriorated.

The present invention has been made in order to solve the above-mentioned conventional problems, and an object of the present invention is to make it possible to detect a heat source with high sensitivity even if the heat source is in a stationary state, and to simplify the device configuration. And to provide an inexpensive heat source detection device.

[0015]

In order to achieve the above object, the present invention is constructed as follows. That is, the present invention includes an infrared sensor fixedly provided with one or more infrared detection elements, and a signal processing unit that processes an infrared detection signal detected by the infrared sensor. On the infrared light receiving surface side, an infrared reflecting surface is arranged so as to face the infrared light receiving central axis of the infrared sensor at an angle with respect to the infrared light receiving central axis of the infrared sensor so that it can rotate in the direction of scanning the detection area of the infrared sensor. Rotation of a reflector that is pivotally supported and that causes infrared rays incident on the infrared reflector to be reflected on the infrared receiving surface side of the fixedly arranged infrared sensor and introduced into the infrared sensor while rotating the infrared reflector. It is configured by providing means.

Further, the infrared reflector is a concave mirror having an infrared reflecting surface formed in a concave shape, and the infrared light reflected by the infrared reflector is condensed and connected to the infrared receiving surface of the infrared sensor. Infrared lens for image is fixedly installed,
It is also a characteristic configuration of the present invention that the infrared sensor is a pyroelectric infrared sensor.

[0017]

In the present invention having the above-described structure, the infrared ray receiving surface side of the fixedly arranged infrared ray sensor is provided with an infrared ray reflecting surface which is obliquely opposed to the infrared ray receiving central axis of the infrared ray sensor. The outer reflector is rotatably supported in the direction of scanning the detection area of the infrared sensor. While the infrared reflector is rotated by the reflector rotating means, the infrared rays incident on the infrared reflector are It is reflected on the infrared receiving surface side of the fixedly arranged infrared sensor and introduced into the infrared sensor.

As described above, the infrared light reflected by the infrared reflector is introduced into the infrared sensor while the infrared reflector is rotated in the direction of scanning the area to be detected by the infrared sensor. Since the area changes from moment to moment and the incident infrared light to the infrared sensor changes equivalently, it is necessary to synchronize with the opening and closing timing of the chopper, such as sampling in a heat source detection device equipped with a chopper. Instead, it becomes possible to capture and process the infrared detection signal at any sampling timing according to the processing speed of the signal processing unit that processes the infrared detection signal, and further, depending on the rotation of the infrared reflector. It is possible to detect a heat source with a maximum field of view of 360 °.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. In the description of the present embodiment, the same reference numerals will be given to the same names as those in the conventional example, and the duplicated description will be omitted.
FIG. 1 is a cross-sectional view showing the configuration of the essential parts of a first embodiment of a heat source detection device according to the present invention, and this device is installed, for example, on the ceiling in a room. In the figure, a motor box 12 formed of a heat insulating material is formed in a housing 1 having a substantially cylindrical shape with a reduced diameter on the lower side of the drawing, and a motor 13 is housed in the motor box 12. As shown in FIG. 2, the motor 13 includes a motor control unit 14
Is connected. There is a board 15 on the upper side of the housing 1.
The substrate 15 is fixedly provided with a pyroelectric infrared sensor 9 in which one or more (for example, eight) infrared detecting elements are arranged in a linear array.

On the infrared receiving surface 16 side of the infrared sensor 9, a plate-shaped infrared light reflecting mirror 6 as an infrared reflector is arranged via an infrared lens 10. The infrared light reflecting mirror 6 has a high reflectance in a wide wavelength band in the infrared region, and the surface side of the reflecting surface 5 is formed of a smooth aluminum vapor deposition plate or a silver plating plate. The infrared reflecting surface 5 of the infrared light reflecting mirror 6 is obliquely opposed to the infrared light receiving central axis C of the infrared sensor 9, and the infrared light reflecting mirror 6 is supported by the supporting shaft 8 of the motor 13. Is rotatably supported in the infrared sensor 9 and is rotatable in the direction of scanning the detection area of the infrared sensor 9. In this embodiment, the support shaft 8 of the motor 13 has an infrared sensor 9 at its center.
The infrared light reflecting mirror 6 is rotatable about the infrared light receiving central axis C of the infrared sensor 9 by 360 ° in the direction of the arrow in the figure. Further, the motor 13 is set so that the rotation speed of the infrared light reflecting mirror 6 is about 1 rpm.
The rotation speed of is set.

The housing 1 is formed with an infrared transmission window 4 which transmits infrared rays from a heat source and guides it into the housing 1. For example, as shown in FIG. Infrared rays from the human body 21 and the like are introduced into the housing 1 through the infrared transmitting window 4, and enter the reflecting surface 5 of the infrared light reflecting mirror 6 as shown in FIG. The light is reflected on the sensor 9 side. In addition,
A support beam (not shown) that supports the motor box 12 is formed in the housing 1 at the portion where the infrared transmission window 4 is formed. The support beam is formed thin and is used as a heat source detection device. Infrared rays from an angle of about 360 ° are introduced into the housing 1 through the infrared transmitting window 4.

The infrared lens 10 has a function of condensing the infrared light reflected by the infrared light reflecting mirror 6 to form an image on the infrared light receiving surface 16 of the infrared sensor 9, for example, a red light. Infrared rays that have entered and reflected in the area AB of the external light reflecting mirror 6 are condensed by the infrared lens 10 and are imaged in the area A′-B ′ of the infrared light receiving surface 16 of the infrared sensor 9. It is like this. The infrared lens 10 is, for example, silicon,
It is composed of a convex lens made of a material transparent in the infrared region such as germanium or a Fresnel lens made of a material such as polyethylene.

In this embodiment, the infrared ray is introduced into the infrared sensor 9 while rotating the infrared light reflecting mirror 6, and the motor 13 rotates the infrared light reflecting mirror 6. However, it functions as a reflector rotating means for reflecting the infrared rays incident on the infrared light reflecting mirror 6 to the infrared light receiving surface side of the fixedly arranged infrared sensor 9 and introducing them into the infrared sensor 9.

In the infrared sensor 9, as shown in FIG.
A signal processing unit 3 for processing the infrared detection signal detected by the infrared sensor 9 is connected, and the signal processing unit 3
Is, for example, an analog signal amplifier 18, an A / D converter
A digital signal processing unit 20 is provided.

The analog signal amplification section 18 includes an infrared sensor 9
The analog infrared detection signal detected by is amplified in an analog manner, and the amplified analog signal is A / D
Add to converter 19.

The A / D converter 19 converts the analog signal applied from the analog signal amplifier 18 into a digital signal and applies it to the digital signal processor 20.

The digital signal processing unit 20 is a CPU (Centra).
l Processing Unit).
According to the algorithm given to PU, the A /
By processing the digital signal applied from the D converter 19, the position, direction, moving speed, etc. of the heat source are detected.

The infrared detection signal acquisition timing in this embodiment, that is, the A / D conversion timing by the A / D converter 19 is set arbitrarily, but in this embodiment, it is about 10 ms (10 The signal is taken in and processed every (10 ^-3 sec), and it is set so that an integral multiple of the signal taking-in cycle coincides with the rotation cycle of the infrared light reflecting mirror 6. By doing so, the signal is taken in every time when the angle direction with respect to the infrared light receiving central axis C of the infrared light reflecting mirror 6 is always oriented in the same direction, whereby the direction of the heat source is obtained. Can be specified accurately.

A motor for rotating the infrared light reflecting mirror 6
13 is configured using a stepping motor, and this motor 13
Is controlled by the CPU, and the number of drive pulses sent for driving the motor 13 is counted by the CPU, the direction in which the infrared light reflecting mirror 6 is facing at that time is determined by this number. In this way, by counting the number of drive pulses while driving the motor 13 by the CPU as described above, the direction of the infrared light reflecting mirror 6 at that time is also determined and the existing direction of the heat source is determined. You can decide.

This embodiment is constructed as described above,
For example, when the infrared light reflecting mirror 6 is at the position shown in FIG. 1, the infrared light from the heat source existing in the detected area 23a shown in FIG. When incident on the infrared ray, the infrared ray is reflected by the reflecting surface 5 of the infrared light reflecting mirror 6 toward the infrared sensor 9 side, condensed by the infrared lens 10 and imaged on the infrared light receiving surface 16 of the infrared sensor 9. This infrared ray is detected by each infrared detection element arranged in a linear array of the infrared sensor 9, and each infrared detection signal is processed by the signal processing unit 3.

When the infrared light reflecting mirror 6 is rotated by the motor 13 in the direction of the arrow in FIG. 1, at this time, the infrared light from the infrared detection area 23b is transmitted through the infrared transmitting window 4 to the infrared light. The light enters the light reflecting mirror 6, and in the same manner as described above, the infrared image is formed on the fixed infrared sensor 9 and processed by the signal processing unit 3.

As described above, the infrared light reflecting mirror 6 is rotated by the motor 13 in the direction in which the detection area of the infrared sensor 9 is scanned, and the infrared light incident on the infrared light reflecting mirror 6 is reflected to reflect the infrared light. Introduced in 9, the detection area of the infrared sensor 9 changes every moment and the incident infrared light changes equivalently. By processing this infrared detection signal by the signal processing unit 3, For example, a two-dimensional infrared image 24 as shown in FIG. 3 is obtained, and the human body 21 as a heat source is detected. Note that, in addition to the human body 21, if a heat source such as a small animal exists in the detected area, the heat source is detected in the same manner.

According to the present embodiment, by the above operation, it is possible to detect the heat source without providing the chopper 11 required in the conventional heat source detection device, and therefore, the chopper 11 and the driving mechanism of the chopper 11 can be detected. , A mechanism for matching the opening / closing timing of the chopper 11 with the signal processing timing by the signal processing unit is omitted, the degree of freedom of the signal processing timing is increased, and the device configuration can be made very simple. .

Further, according to the present embodiment, the infrared sensor 9
Is fixedly arranged on the substrate 15, and unlike a device for detecting infrared rays while rotating the infrared sensor 9 as shown in FIG. 9, it is complicated to rotate while rotating the infrared sensor 9 between reciprocating directions. A simple rotation control mechanism and a mechanism such as a slip ring for twisting a signal line for extracting an infrared detection signal from the infrared sensor 9 are not required, and the device configuration is simple. Moreover, unlike the device shown in FIG. 9, the device of this embodiment is not adversely affected by the vibration of the infrared sensor 9 caused by rotating the infrared sensor 9 itself, and stably extracts the infrared detection signal. It is possible to perform signal processing by means of the signal processing, and it is possible to increase the sensitivity of the heat source detection device.

Further, according to this embodiment, since the detection area of the infrared sensor 9 is equivalently changed by rotating the infrared light reflecting mirror 6, the rotation support of the infrared light reflecting mirror 6 is increased. It is possible to obtain a field of view of about 360 ° around the axis, and it is possible to achieve a wide angle detection area.

When the heat source in the detected area moves at the same speed as the rotation speed of the infrared light reflecting mirror 6, the heat source detecting device of this embodiment in which the infrared sensor 9 is formed by a pyroelectric sensor. Cannot detect the heat source.
However, the heat source to be detected in fields such as home appliances and crime prevention is usually the human body 21 in most cases,
In the present embodiment, it is considered that the moving speed of the human body 21 and the rotating speed of the infrared light reflecting mirror 6 do not almost match at all from the following facts.

For example, if the distance from the heat source detection device to the human body 21 as a heat source is 2 m and the rotation speed of the infrared light reflecting mirror 6 at this time is ω, the field of view (the object to be covered by rotation of the infrared light reflecting mirror 6 is The moving speed V ₀ of the detection area) is expressed by the following equation (1).

V ₀ = R · ω = 2ω (1)

In this embodiment, since the infrared light reflecting mirror 6 is rotated at a rotation speed of about 1 rpm, the rotation angular velocity ω is ω≈1.
(Rad / s) = 57.3 (° / s), and at this time, the rotation speed V ₀ of the infrared reflecting mirror 6 becomes about 2 m / s. Therefore, if the human body 21 moves at a constant speed equal to or higher than the moving speed V ₀ (2 m / s), it becomes difficult for the heat source detection device to detect the human body 21, but, for example, in a room as shown in FIG.
It is unlikely that a person is constantly moving at a constant speed of 2 m / s or more. In this embodiment, by rotating the infrared light reflecting mirror 6 at a rotation speed of about 1 rpm, the human body 21 as a heat source is
The heat source can be detected without any trouble even when moving.

Further, according to this embodiment, the infrared light reflecting mirror 6
Is rotated at a rotation speed of 1 rpm, an infrared detection signal detected by the infrared sensor 9 is transmitted by the signal processing unit 3
The infrared light reflecting mirror 6 that rotates at a rotation speed of 1 rpm must be rotated by 0.6 ° in 10 ms, and the signal processing is performed by taking in signals at a processing speed of ms (10 × 10 ^-3 seconds) or less. Therefore, the detection area (the detection area of the infrared sensor 9) where the signal processing unit 3 sequentially processes the signal is 0.6 °.
Since the positions are scanned one by one, the heat source information can be obtained in sufficient detail, and the heat source can be detected with extremely high sensitivity.

Further, according to the present embodiment, the motor 13 for rotating the infrared light reflecting mirror 6 is housed in the motor box 12 formed of a heat insulating material, so that the motor 13 is
The heat source can be accurately detected without being affected by the heat generated by the rotation of the.

FIG. 4 is a sectional view showing the structure of the essential parts of a second embodiment of the heat source detecting device according to the present invention. The present embodiment is constructed in substantially the same manner as the first embodiment, and this embodiment is different from the first embodiment in that the infrared light reflecting mirror 6 has an infrared reflecting surface 5 Is a concave mirror formed in a concave shape, and the infrared lens 10 is omitted. The rest of the configuration is the same as that of the first embodiment, so its explanation is omitted.

The present embodiment is constructed as described above,
In this embodiment, since the infrared light reflecting mirror 6 is composed of a concave mirror, as shown in the figure, the infrared light incident on the infrared light reflecting mirror 6 is reflected by the reflecting surface 5 without the infrared lens. At this time, the infrared rays that are collected and imaged on the infrared light receiving surface 16 of the infrared sensor 9 and enter, for example, the area AB of the infrared light reflecting mirror 6 are A on the infrared light receiving surface 16 of the infrared sensor 9. ′-
An image is formed in the B'region. Then, as in the case of the first embodiment, while the infrared light reflecting mirror 6 is being rotated by the motor 13, the infrared sensor 9 detects the infrared rays incident on the infrared light reflecting mirror 6.
By reflecting the light toward the infrared light receiving surface 16 side of the infrared sensor 9 and introducing the infrared light into the infrared sensor 9, the detected area of the infrared sensor 9 is scanned and the heat source in the detected area is scanned as in the first embodiment. Infrared rays are detected, and the same effect as the first embodiment can be obtained.

Further, according to this embodiment, the infrared light reflecting mirror 6
Since the concave lens is used as the concave mirror, the infrared lens 10 provided in the first embodiment can be omitted, and thus the device configuration of the heat source detection device can be simplified accordingly.

The present invention is not limited to the above-mentioned embodiments, and various embodiments can be adopted. For example, although the infrared sensor 9 is a pyroelectric sensor in the above embodiment, the infrared sensor 9 is not limited to a pyroelectric sensor.
Various infrared sensors such as other thermal infrared sensors such as bolometers and thermistors and quantum infrared sensors can be used.

In the above embodiment, the infrared sensor 9
3 is a linear array sensor in which eight infrared detecting elements are arranged in a linear array as shown in FIG. 3. However, the number and the arrangement state of the infrared detecting elements forming the infrared sensor 9 are shown. Is not particularly limited, and the infrared sensor 9 is formed by appropriately disposing one or more infrared detecting elements, and may be a two-dimensional array sensor as shown in FIG. 5, for example.

As described above, when the infrared sensor 9 is composed of a two-dimensional array sensor, the signal processing unit 3 can instantaneously capture a two-dimensional infrared image of a certain detection area at one time and perform signal processing. , Infrared sensor 9
It is possible to detect a large amount of heat source information at a time more finely than when a linear array sensor is used. Therefore, even if the interval at which the infrared detection signals are taken in is increased, it is possible to obtain heat source information that is about the same as the information obtained by the linear array sensor.

Further, in the above embodiment, the signal processing unit 3
Has a configuration including an analog signal amplification unit 18, an A / D converter 19, and a digital signal processing unit 20, but the configuration of the signal processing unit 3 is not particularly limited, and the infrared detection signal of the infrared sensor 9 is The signal processing is appropriately set so that the heat source information in the detection area of the infrared sensor 9 can be obtained.

Further, in the above embodiment, the infrared mirror 6 is used.
Is configured to rotate around the infrared light receiving central axis C of the infrared sensor 9, but the infrared reflector such as the infrared light reflecting mirror 6 does not necessarily rotate around the infrared light receiving central axis of the infrared sensor 9. However, the infrared sensor 9 is not limited to this, and may be rotatably supported in the scanning direction of the detection area of the infrared sensor 9.

Further, in the above embodiment, the infrared sensor 9
Although the infrared light reflecting mirror 6 is provided as the infrared reflecting body that reflects the infrared rays from the heat source in the detected area toward the infrared sensor 9 side, the infrared reflecting body is not necessarily the infrared light reflecting mirror 6. The material is not limited to this, and any material that can reflect infrared rays on the infrared reflection surface and can be introduced into the infrared sensor 9 can be used, and the material, shape, and the like can be appropriately set.

Further, in the first embodiment, the infrared lens 10 is formed by a convex lens or Fresnel lens using silicon or germanium, but the material and shape of the infrared lens 10 are not particularly limited. It is not a thing, but is set as appropriate so that the infrared light reflected by the infrared reflector is condensed and imaged on the infrared light receiving surface 16 of the infrared sensor 9.

Furthermore, in the above embodiment, the infrared light reflecting mirror 6 is used.
Although the motor 13 is provided as the reflector rotating means for rotating the, the reflector rotating means for rotating the infrared reflecting body such as the infrared light reflecting mirror 6 is not limited to the motor 13, and the infrared reflecting body Anything that can be smoothly rotated will do.

Further, in the above embodiment, the infrared light reflecting mirror 6 is used.
Although the rotation speed for rotating is about 1 rpm, the rotation speed (or rotation speed) of the infrared reflector such as the infrared light reflecting mirror 6 is not particularly limited and may be set appropriately. However, when it is desired to detect the human body 21 by the heat source detecting device as in the above embodiment, the rotation speed of the infrared reflector is set to about 1 rpm as in the above embodiment so that the moving speed is 2 m / s or less. Since it is possible to reliably detect the human body 21, which is considered to be present, the rotation speed of the infrared reflector is set to 1 rp.
It is preferably about m 2 or more.

Depending on the moving speed of the heat source desired to be detected by the heat source detecting device, for example, the moving speed V _{0 of the} detected region obtained from the above equation (1) is set to be higher than the moving speed of the heat source to be detected. Rotation speed of infrared reflector ω
Since it becomes possible to reliably detect the heat source to be detected by setting, the rotational speed of the infrared reflector may be set according to the moving speed of the heat source to be detected.

Further, in the above embodiment, the heat source detecting device is installed on the ceiling of the room, but the heat source detecting device of the present invention is installed at an appropriate place where, for example, crime prevention is required. By setting the heat source detection device of the invention to detect the heat source, it is possible to accurately detect the heat source information of the maximum circumference of up to 360 ° and exhibit an excellent effect.

[0056]

According to the present invention, an infrared sensor is fixedly arranged, and an infrared reflector having an infrared reflecting surface obliquely opposed to the infrared receiving center axis of the infrared sensor is opposed to the infrared reflector. While rotating the detection area of the sensor in the scanning direction, the incident infrared light is changed equivalently by reflecting and introducing the infrared light incident on the infrared reflector to the infrared light receiving surface side of the infrared sensor. Therefore, even if the chopper, which is indispensable for the conventional heat source detection device using the pyroelectric infrared sensor, is not provided, the heat source information of 360 ° at the maximum can be accurately obtained.

Therefore, unlike the heat source detection device provided with a chopper, it is not necessary to provide a drive mechanism for the chopper or a means for timing the drive of the chopper and the signal processing of the infrared detection signal, and the device configuration is correspondingly provided. It can be very simple.

Further, according to the present invention, the infrared sensor is fixedly arranged, and unlike the heat source detecting device for rotating the infrared sensor itself, it is adversely affected by the displacement of the infrared sensor caused by the rotation of the infrared sensor itself. Instead, it is possible to stably extract the infrared detection signal and perform signal processing, and since the infrared sensor itself does not move, the signal line connecting the infrared sensor and the signal processing unit is not entangled. Detecting a heat source with high sensitivity with a very simple device configuration without the need for a mechanism such as a slip ring for twisting signal lines or a complicated rotation control mechanism for rotating the infrared sensor while switching the rotation direction. You can

As described above, according to the present invention, infrared rays from a heat source can be detected without using a chopper or a complicated rotation control mechanism even if a pyroelectric sensor having a very high sensitivity and a low cost is used. Therefore, an excellent heat source detection device having a very simple device configuration, low cost, and high sensitivity can be obtained.

[Brief description of drawings]

FIG. 1 is a main part configuration diagram showing a first embodiment of a heat source detection device according to the present invention.

FIG. 2 is a block diagram showing a control configuration of a heat source detection device according to the present invention.

FIG. 3 is an explanatory diagram showing an installation state of a heat source detection device according to the present invention and an example of heat source information obtained by the heat source detection device.

FIG. 4 is a main part configuration diagram showing a second embodiment of the heat source detection device according to the present invention.

FIG. 5 is an explanatory view showing another embodiment of the heat source detection device according to the present invention.

FIG. 6 is an explanatory diagram showing an example of a conventional heat source detection device.

FIG. 7 is an explanatory diagram showing another example of a conventional heat source detection device.

FIG. 8 is an explanatory diagram showing still another example of a conventional heat source detection device.

FIG. 9 is an explanatory diagram showing still another example of a conventional heat source detection device.

[Explanation of symbols]

 3 signal processing section 6 infrared reflecting mirror 9 infrared sensor 10 infrared lens 13 motor 14 motor control section 23, 23a, 23b detection area

Claims (4)

[Claims] 1. An infrared sensor fixedly provided with at least one infrared detection element, and a signal processing unit for processing an infrared detection signal detected by the infrared sensor, wherein the infrared sensor has a red color. On the outer light-receiving surface side, an infrared reflector, which has an infrared-reflecting surface facing the infrared sensor central axis of the infrared sensor at an angle, is rotatably rotatable in the direction of scanning the detection area of the infrared sensor. A rotating member for rotating the infrared reflector that reflects infrared rays incident on the infrared reflector toward the infrared receiving surface of the fixed infrared sensor and introduces the infrared light into the infrared sensor. A heat source detection device characterized by being provided. 2. The heat source detecting device according to claim 1, wherein the infrared reflector is a concave mirror having an infrared reflecting surface formed in a concave shape. 3. An infrared lens, which is fixedly arranged to focus infrared rays reflected by an infrared reflector and form an image on an infrared light receiving surface of an infrared sensor. 2. The heat source detection device according to 2. 4. The infrared sensor is a pyroelectric infrared sensor, wherein the infrared sensor is a pyroelectric infrared sensor.
The heat source detection device described.