JPH0816544B2 - Infrared detector for air conditioner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an infrared detector for an air conditioner used for detecting temperature distribution in an air-conditioned room, position of a person, and the like.

(Prior Art) As a conventional example of an air conditioner equipped with an infrared detecting device for an air conditioner, for example, a device described in JP-A-61-195232 can be cited. In the device, the room is divided into a plurality of areas in the front-rear direction and the left-right direction from the indoor unit of the air conditioner installed on the wall surface, and a plurality of thermoelectric infrared sensors are provided in the indoor unit corresponding to each area. It is provided in. Then, the temperature of the floor surface of each area is measured by the infrared rays coming from each area, and the blowing direction of the air blown from the indoor unit is controlled based on the measurement result so that the temperature distribution in the room becomes uniform. Has been done.

(Problems to be Solved by the Invention) By the way, the thermoelectric infrared sensor used for temperature measurement as described above is a relatively expensive component, and in the above device, a plurality of infrared sensors are provided in correspondence with the respective compartment areas in the room. Therefore, there is a problem that the manufacturing cost becomes high.

On the other hand, in recent years, using a pyroelectric infrared sensor,
A person detection device for discriminating the presence of a person in a detection area has been put into practical use. The pyroelectric infrared sensor is sensitive to a change in the amount of incident infrared rays. When a person is present in the detection area, the amount of infrared rays incident from the person corresponding to the body temperature changes with the movement of the person. Therefore, an output corresponding to this change is generated by the sensor. It is possible to detect the position of a person by installing such a person detecting device in an air conditioner and discriminating the presence of the person in each compartment of the room. As a result, the thermoelectric infrared rays described above can be detected. The comfort can be further improved by controlling the wind direction of, for example, the blowing air based on the measurement result of the indoor temperature distribution by the sensor and the detection position of the person by the pyroelectric infrared sensor. However, if the infrared sensor for detecting a person is additionally provided as described above, the manufacturing cost is further increased.

The present invention has been made in view of the above, and an object thereof is to provide an infrared detecting device for an air conditioner, which can detect temperature in a room and position of a person with a more inexpensive configuration. .

(Means for Solving the Problem) Therefore, the infrared detecting device for an air conditioner of the present invention includes one infrared sensor 3 that is sensitive to a change in the amount of incident infrared light,
Condensing means 5 having a plurality of polarizing portions 5a to 5f for condensing infrared rays from a room divided into a plurality of areas A to F on the infrared sensor 3 in each of the areas A to F, and each of the areas. A switching member 6 having transmission windows 8 and 9 is provided while moving between the respective focusing paths from A to F to the infrared sensor 3, and the transmission windows 8 and 9 are provided in the respective focusing paths. When positioned at a transmission position on one light collecting path, only infrared rays in this light collecting path are configured to pass through the transmission windows 8 and 9 and be condensed on the infrared sensor 3. From the non-transmissive position that blocks the incidence of the condensed infrared rays from the above to the infrared sensor 3 at the transmission position and when the transmission windows 8 and 9 are positioned at the transmission position. From the output after stabilization of the output change of this infrared sensor 3, A person detecting means 33 for discriminating the presence is provided, and a temperature detecting means for obtaining the temperature of the infrared radiation object from the output change of the infrared sensor 3 in response to the start of the incident.
34 are provided.

In addition, in this specification, infrared rays having a wavelength of 1 to 15 μm are targeted, and description will be given by appropriately using vocabulary relating to light in the infrared rays.

(Operation) In the above infrared detector for an air conditioner, when the transmission windows 8 and 9 are located at the transmission positions on the light collecting path from the area A in the room, for example, first, the collected infrared rays from the area A An output corresponding to the amount of incident infrared rays is generated from the infrared sensor 3 at the time of starting the incidence, and after the output change at this time becomes stable, when there is a change in the amount of incident infrared rays thereafter, that is, there is a person in the detection area A, When the incident infrared ray amount corresponding to the body temperature changes due to the movement of the person, the infrared sensor 3 outputs an output corresponding to the change in the incident amount. Therefore, it is determined whether or not there is a person in the area A based on the output from the sensor 3 after the output change immediately after the movement to the transmission position is stabilized. In addition, the output change immediately after moving to the transmission position shows an output change that rises to a peak output according to the size of the incident infrared ray from the area A and then decreases with a specific time constant. By detecting the amount, the magnitude of the amount of incident infrared rays from the area A, that is, the temperature of the infrared radiating material such as the floor surface in the area A can be obtained. Then, the switching member 6 is moved so that the transmissive windows 8 and 9 are sequentially positioned on the light collecting path from the regions B, C, ... By discriminating the person in each of the regions A to F and detecting the temperature. It can be performed. As described above, in the above description, one pyroelectric infrared sensor 3 that is sensitive to the change in the amount of incident infrared light is provided, and it is possible to detect a person and temperature in each of the areas A to F in the room. Since it is done, the production cost can be made inexpensive.

(Example) Next, a specific example of the infrared detecting device for an air conditioner of the present invention will be described in detail with reference to the drawings.

First, FIG. 2 shows a cross-sectional view of an infrared detector M for an air conditioner according to an embodiment of the present invention which is installed in a wall-mounted indoor unit of an air conditioner. In the figure, 1
Is a substantially box-shaped casing, and a pyroelectric infrared sensor 3 has a light-receiving surface on the front surface of the casing 1 (lower side in FIG. 2). It is attached facing the side surface 4). A light collecting plate (light collecting means) 5 is attached to the front surface 4, the function of which will be described later. Further, a cylindrical drum (switching means) 6 surrounding the circuit board 2 is erected inside the casing 1, and the lower end shaft portion of the drum 6 is, as shown in FIG. A step motor 7 for rotating the drum 6 is connected.

FIG. 5 shows an indoor unit in which a wall surface of an indoor unit 20 of an air conditioner equipped with the infrared detector M is mounted on one wall, except for the floor immediately below the indoor unit 20.
A schematic diagram in the case where the infrared detection device M detects the radiated infrared rays in each of the six areas A to F divided into two in the front-rear direction and three in the left-right direction from the installation wall surface of 20 is shown. Shows. The indoor unit 20 has a suction port on its front panel.
21 is formed, and the infrared detecting device M is arranged on the side of the suction port 21. A blowout port 22 is formed below the suction port 21, and a horizontal flap 23 and a vertical flap 24 for controlling the blowing direction are provided at the blowout port 22.

The light condensing plate 5 has a divided area A formed by dividing the room into six.
As shown in FIG. 3, a total of six small lens sections (polarizing sections) 5a to 5f are formed in two rows above and below and three rows corresponding to rows F to F. First, the small lens portion 5a detects only infrared rays emitted from the region A and transmitted through the small lens portion 5a among infrared rays emitted from the floor surface, wall surfaces, furniture, etc. in the room according to their temperatures. It has the function of condensing light on. Further, the other small lens portions 5b and 5c have a function of condensing infrared rays, which are radiated from the areas B, C, ..., And are transmitted through the respective small lens portions 5b, 5c ,. are doing. In other words, the small lens portions 5a to 5f define a light collecting area for each of the areas A to F in the room, and the infrared rays transmitted from the corresponding small lens portions 5a to 5f are collected on the sensor 3 respectively. A condensing path is formed. The small lens portions 5a to 5f are formed at positions apart from each other in the non-lens portion 5n of the light collector 5.

On the other hand, in the drum 6 in which a part of the cylindrical surface is located between the sensor 3 and the light collector 5, the cylindrical surface is separated from each other in the circumferential direction and vertically in the vertical direction as shown in FIG. First and second openings (transmissive windows) 8 and 9 having different positions are formed. When the drum 6 is rotated, the first opening 8 on the lower side is provided with the small lens portions 5 on the lower stage side of the light collector 5.
The second opening 9 on the upper side is formed at a position traversing each condensing path from a, 5b, 5c to the sensor 3, and the upper second side aperture 9 of the condensing plate 5 includes sensors from the small lens portions 5d, 5e, 5f. It is formed at a position crossing each light condensing path to the light source 3.

When the first opening 8 of the drum 6 is located on the light collecting path from the small lens portion 5a to the sensor 3 (hereinafter, this position is referred to as a transmission position with respect to the area A), the sensor 3 has the small opening. Only the infrared rays condensed through the lens portion 5a, that is, the infrared rays from the area A are transmitted through the first opening 8 and condensed on the sensor 3. Therefore, at this position, the sensor 3 outputs a signal corresponding to the amount of incident infrared rays from the area A. When the drum 6 is rotated counterclockwise from the above position in FIG. 2, the first opening 8 extends from the transmission position for the area A behind the small lens portion 5a to the rear of the small lens portion 5b, that is, the area B. When the entire first opening 8 is located behind the non-lens portion 5n between the small lens portion 5a and the small lens portion 5b (hereinafter, referred to as a cutoff position). Of each of the small lens portions 5a and 5b is blocked by the drum 6, and as a result, the sensor 3 is not affected by any area A in the room.
An incident blocking state in which condensed infrared rays do not enter is also formed from ~ F. After this incident blocking state, the first opening 8 is opened in the region B.
Is moved to the transparent position with respect to. At this time, only the infrared rays from the area B are focused on the sensor 3. Further drum 6
By rotating the first opening 8 to the area C after the entrance blocking state is once formed while the first opening 8 reaches from the small lens portion 5b to the back of the small lens portion 5c in the same manner as described above. Only the infrared rays from the area C located at the transmission position are detected by the sensor 3
It can be switched to focus on.

When the drum 6 is further rotated, the first opening 8
The incident blocking state is once formed at a position beyond the condensing path from the region C, and then the second opening 9 is located on the condensing path from the small lens portion 5d on the upper stage side of the condensing plate 5, that is, Only the infrared rays from the area D located at the transmission position with respect to the area D are focused on the sensor 3, and further rotation is continued, so that the infrared rays focused on the sensor 3 sequentially pass through the incident blocking state, and the area E, It is designed to switch to infrared rays from F.

6 (a) and 6 (b), the pyroelectric infrared sensor 3 is shown.
FIG. 7A is an explanatory diagram of input / output characteristics in FIG.
When rectangular wave-shaped infrared energy as shown in FIG. 3 is incident on the sensor 3, as shown in FIG. 7B, first, a voltage signal corresponding to the amount of change in incident energy is output when the incident energy rises (period I ). That is, the output voltage starts to rise with a predetermined time constant from the rise of the incident energy, reaches a peak value according to the magnitude of the incident energy, and then the output voltage drops to 0 with the same time constant as the rise. To do. Then, while the incident energy is constant, the output voltage is maintained at 0 (period II), and then, when the incident energy falls, a voltage signal having the opposite polarity to the period (I) is output (period III). .

When the condensed infrared light from the room to the pyroelectric infrared sensor 3 having the input / output characteristics as described above is sequentially switched as the infrared light for each of the areas A to F by rotating the drum 6,
For example, the first opening 8 shown in FIG. 7 (a) is located behind the non-lens portion 5n between the small lens portions 5a and 5b of the light collector 5 from the cutoff position shown in FIG. 7 (b). When the lens 5b is positioned at the transmission position with respect to the area B behind the lens portion 5b, the infrared rays from the area B are started to be incident on the sensor 3 immediately after the movement to the transmission position. Simultaneously with the output in the period I in b), the voltage signal reaching the peak voltage according to the incident infrared ray amount at this time is output. After that, in the state of being held at the transmission position, if there is no change in the incident infrared ray amount from the region B,
Similar to the output in the period II in FIG. 6 (b), the voltage signal is maintained at almost 0.

Therefore, by monitoring the waveform of the output voltage from the sensor 3 for a predetermined short time during the period II,
It is possible to determine whether or not there is a person in this area B.
That is, when there is no person in the area B and only infrared rays radiated from a stationary body such as a floor surface, a wall surface, or furniture in the area B according to the temperature are incident on the sensor 3,
Since the temperature hardly changes within the short monitoring time, the output voltage from the sensor 3 is maintained at almost zero.
When a person who is a moving body exists in the area B and infrared rays corresponding to the body temperature are incident on the sensor 3, the amount of infrared rays incident on the sensor 3 varies with the movement of the person. . As a result, a non-zero voltage signal is output in the period II, and the presence of a person in the area B is discriminated.

On the other hand, the output change from the sensor 3 during the period I corresponds to the magnitude of the amount of incident infrared rays from the region B, that is, the peak voltage according to the temperature of the floor or the like in the region B as described above. Since the change is shown, the temperature of the region B can be obtained from this voltage change.

Thus, in the above, for example, the temperature and the presence of a person in this region B are discriminated from the outputs in the period I and the period II from the sensor 3 when the first opening 8 is positioned at the transmission position with respect to the region B, for example. It is possible to rotate the drum 6 and sequentially perform the above determination for each of the regions A to F, thereby detecting the temperature of each of the regions A to F and detecting the position of the person in the room. It can be carried out.

Therefore, the circuit board 2 is provided with a control circuit for detecting the presence of a person and the temperature in each area by controlling the rotational position of the drum 6 and the output from the sensor 3 as described above. The configuration will be described below with reference to the control block diagram of FIG.

As shown in the figure, the control circuit includes a sequence processing unit 31 including a control IC having a microcomputer function, a motor drive circuit 32, a human detection signal processing unit (human detection means) 33,
The temperature signal processing section (temperature detecting means) 34 is included in the temperature signal processing section 34. First, the control during the human detection operation will be described.

When the detection operation start command signal is input to the sequence processing unit 31 from an air conditioning operation control device (not shown) that controls the operation of the entire air conditioner, the sequence processing unit 31 first causes the motor drive circuit 32 to operate. An operation signal with the area A as the detection area is output. As a result, the step motor 7
Is activated and the drum 6 is rotated until the first opening 8 is located at the transmission position for the area A. On the other hand, the output of the infrared sensor 3 is output to the amplification circuit in the human detection signal processing unit 33.
It is input to the comparator 36 via 35, and the output of the comparator 36 is further input to the gate circuit 37. The gate circuit 37 is provided with a one-shot multi. The one-shot multi waits for the passage of the period I which causes an output change immediately after the drum 6 is positioned at the transmission position corresponding to the area A. Then, when the period II is reached, a trigger signal is input from the sequence processing unit 31, and a pulse signal having a pulse width of, for example, 3 seconds is generated in the one-shot multi by the signal. During this pulse signal generation period, the output of the comparator 36 passes through the gate circuit 37 and is input to the sequence processing unit 31. In this way, during the human detection operation period (3 seconds) defined by the one-shot multi, there is a change in the incident infrared ray amount from the area A to the infrared sensor 3, and as a result, the input voltage to the comparator 36 is changed. When a voltage output of "H" level is generated from the comparator 36 exceeding the reference voltage, the sequence processing section 31 stores a signal of presence of a person in the person detection memory corresponding to the area A. On the other hand, when the person detection operation time has elapsed while the output from the comparator 36 remains at the “L” level, the person detection signal corresponding to the area A is stored with the person absence signal, and the person detection area corresponding to the area A is stored. The detection operation ends.

Then, after performing a switching operation to set the detection area to the next area B, that is, the rotational position control of the drum 6 that positions the first opening 8 at the transmission position with respect to the area B, the sensor during the human detection operation period is similar to the above. The presence of a person in the area B is discriminated from the presence or absence of the output change of No. 3, and the same operation is sequentially repeated in the order of the areas C, D, E, and F to obtain each area A in the room.
~ The presence of a person for each F is determined.

The human detection operation as described above is performed in the entire area A to
After going to F, the sequence processing unit 31 then controls the temperature detection operation. This is from area A to area B,
Control is performed such that the output signal from the temperature signal processing unit 34 is read while sequentially switching the detection regions in the order of C. First, in the control of the drum 6 at the time of this temperature detection operation, a case where the detection area is, for example, the area B will be described as an example. In this case, the first opening 8 in the drum 6
Between the transmission position for the area B shown in FIG. 7 (b) and the blocking position behind the non-lens portion 5n between the small lens portions 5a and 5b shown in FIG. 7 (a). , Predetermined time,
Reciprocate intermittently. This reciprocating motion is performed at a cycle that matches the sensitive speed of the sensor 3. That is, the output of the sensor 3 corresponds to the intensity of the collected infrared light from the region B, that is, the intensity corresponding to the temperature of the floor surface in the region B in the period corresponding to the period I immediately after being located at the transmission position. The drum 6 is moved to the peak voltage with a specific time constant, but before the peak voltage is reached, the drum 6 is moved from the transmission position to the blocking position. As a result, the output of the sensor 3 is lowered, and when the voltage reaches approximately 0, the output is controlled to move to the transmission position again.

The sequence processing section 31 outputs an operation signal for controlling the rotational position of the drum 6 as described above to the motor drive circuit 32. The output from the sensor 3 at this time is output to the amplifier circuit 4 in the temperature signal processing unit 34 shown in FIG.
1. The correction circuit 42 performs signal amplification and correction. In the correction circuit 42, in addition to the emissivity correction, the correction is made by the difference in the incident angle of the incident infrared rays on the light receiving surface of the sensor 3 for each area A to F and the difference in the distance to the floor surface for each area A to F. Is done.
After that, the signal is input to the sequence processing unit 31 via the synchronous detection circuit 43, the adder 44, and the linearizer 45. Regarding the signal processing of these, FIG. 8A to FIG.
Next, description will be given with reference to the signal waveform schematic diagram of (e).

FIG. 8 (a) is a region given by controlling the rotational position of the drum 6 to reciprocate the first opening 8 between the transmission position for the region B and the blocking position adjacent thereto as shown in FIG. The intermittent open / closed state of the focused infrared ray path from A, that is, the chopping cycle is shown. As a result, the sensor 3 outputs a voltage of a substantially sawtooth wave as shown in FIG. 8 (b). This output voltage is
It is input to the synchronous detection circuit 43 via 41 and the correction circuit 42. A detection command signal is output from the sequence processing unit 31 to the synchronous detection circuit 43 at the start of the temperature detection operation for reciprocating the rotational position of the drum 6 as described above. Based on this signal, as shown in FIG. 8 (c), a synchronous detection timing pulse, which is the same as the reciprocating cycle of the drum 6 and slightly delayed in phase, is internally generated. The detection signal of the output voltage from the sensor 3 during the "H" level output period and the inverted signal of the detection signal during the "L" level output period of the timing pulse are output from the synchronous detection circuit 43. Then, the addition processing of both signals is performed in the adder 44 to obtain the signal output shown in FIG. 8 (d), and the smoothing processing for this signal output is further performed in the linear analyzer 45 to obtain the signal output shown in FIG. As shown in e), it is converted into a DC voltage signal having a voltage value corresponding to the amount of infrared energy incident on the sensor 3. This signal is read by the sequence processing unit 31, further subjected to voltage-temperature conversion processing, and the result is stored in the temperature memory corresponding to the area B, thereby ending the temperature detection operation for the area B.

After the temperature detection operation is sequentially performed in the order from the area A to the area F to obtain the temperatures of the areas A to F, the sequence processing unit 31 air-conditions the previous human detection result and the temperature detection result. The process of transmitting the detection result to the air-conditioning operation control device is continued while the person detection operation from the area A to the area F and the temperature detection operation are alternately repeated.

In FIG. 1, reference numeral 48 is a thermistor for detecting the internal temperature of the casing 1 of the infrared detector M. In the sensor 3, even in a state where the infrared rays collected from the room are blocked, for example, infrared rays radiated from the cylindrical inner wall surface of the drum 6 facing the sensor 3 in accordance with the temperature of the cylindrical lenses 5a to 5f. The incident light is weak compared to the amount of infrared light collected through the light. Therefore, the output of the sensor 3 when the drum 6 is positioned at the transmission position shows a change depending on the difference between the amount of collected infrared light at this time and the amount of incident infrared light at the time of blocking, and from this change result. The required temperature includes the amount of incident infrared rays at the time of interruption, that is, the variation in temperature around the sensor 3 as an error factor.
Therefore, in the above description, the thermistor 48 detects the ambient temperature of the sensor 3, and the linearizer 45 performs a correction based on the detection result to enhance the detection accuracy.

The air conditioning operation control device controls the blowing angles of the horizontal and vertical flaps 23 and 24, that is, the wind direction of the blowing air into the room, based on the human detection position from the infrared detecting device M and the temperature data for each area. Take control. For example, taking the example after the heating operation starts, the temperature of the blown air is 40 ° C after the start.
Set a blowing direction that blows horizontally above the person's head until the temperature reaches to prevent cold draft by preventing low-temperature blown air from hitting the person. Next, when the blowout temperature exceeds 40 ° C., the horizontal flap 23 is directed downward to warm the floor surface, and the vertical flap 24 is directed toward the peripheral area adjacent to the human detection area transmitted from the infrared detection device M. Is set to a state where the wind blows around the person. Then, in this state, when the detected room temperature exceeds 15 ° C, the blowing direction is set as the person detection area, and hot air is directly applied to the person to rapidly warm the surroundings of the person. in this way,
In the above, while preventing the cold draft at the time of startup, the control that improves the quick warming property is performed, and the wind direction control that follows the movement of the person is also performed.

As described above, in the infrared detecting device for the air conditioner of the above-described embodiment, one pyroelectric infrared sensor 3 that is sensitive to the change in the amount of incident infrared rays is provided, so that the number of people Since the detection and the temperature detection can be performed, the manufacturing cost can be reduced. Further, since the intermittent output change signal generated by intermittently injecting the infrared rays corresponding to the temperature from one region to the sensor 3 is smoothed, the temperature is obtained from the averaged output. The temperature can be detected with high accuracy, and the configuration becomes simpler than the configuration in which, for example, the peak values of the output change signals are sequentially stored and then the average value is calculated. It can be cheap. Further, the above-mentioned intermittent incidence is performed by controlling the drum 6 for switching the detection region, and it is not necessary to provide a separate member dedicated for this purpose. It is possible. Furthermore, since the drum 6 is reciprocated at a short distance between the adjacent condensing paths and the position in the cutoff space, an intermittent output change signal from one region can be obtained. It is also possible to shorten the. Further, since the variation of the infrared radiation amount from the inner peripheral surface of the drum 6 or the like to the infrared sensor 3, that is, the temperature variation of the drum 6 or the like is detected and the correction based on this is performed, the accuracy is improved. High temperature detection can be performed.

In the above embodiments, the drum 6 having the first and second openings 8 and 9 is described as an example of the switching member. However, for example, a plate-like member that reciprocates between the light collecting paths from the room or It is also possible to use a band-shaped member or the like. Although the above description has been given by taking an example in which the room is divided into 6 sections, the present invention can be applied to any number of sections.

(Effects of the Invention) As described above, in the infrared detector for an air conditioner according to the first aspect of the present invention, one pyroelectric infrared sensor that is sensitive to changes in the amount of incident infrared rays is provided, and Since the detection of the person and the detection of the temperature for each divided area can be performed, the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a control block diagram of an infrared detector for an air conditioner according to an embodiment of the present invention, FIG. 2 is a plan sectional view showing an internal configuration of the above device, and FIG. 3 is a III-III line in FIG. FIG. 4 is a perspective view of a drum in the above apparatus, FIG. 5 is a schematic view of a room in which an indoor unit of an air conditioner incorporating the above apparatus is installed, and FIGS. 6 (a) and 6 (b). Are explanatory views showing the input / output characteristics of the infrared sensor in the above device,
7 (a) and 7 (b) are explanatory views showing a cutoff position and a transmission position in the device, respectively, and FIGS. 8 (a) to 8 (e) are signal processing performed by the temperature signal processing unit in the device, respectively. It is a signal waveform schematic diagram which shows a process. 3 ... Infrared sensor, 5 ... Light collecting plate (light collecting means), 6 ...
... Drums (switching means), 8, 9 ... Openings (transmissive windows), 33
...... Person detection signal processing section (person detection means), 34 ...... Temperature signal processing section (temperature detection means), 5a to 5f ...... Small lens section (polarization section), AF areas.

Claims (1)

[Claims] 1. An infrared sensor (3) which is sensitive to a change in the amount of incident infrared rays, and infrared rays from a room divided into a plurality of areas (A to F), respectively for each of the areas (A to F). A plurality of polarization parts (5a) for condensing on the infrared sensor (3)
.About.5f) and light collecting means (5), and each of the regions (A to
A switching member (6) having a transmission window (8) (9) is provided to move between the respective focusing paths from F) to the infrared sensor (3), and the transmission window (8) (9) is provided. Is positioned at a transmission position on one of the light collecting paths, only infrared rays in the light collecting path pass through the transmission windows (8) and (9) and the infrared sensor The transparent windows (8) and (9) are arranged from the non-transmissive position to the transmissive position, which is configured to focus the light on the infrared sensor (3) from the room. A person detecting means (33) for discriminating the presence of a person from the output after stabilization of the output change of the infrared sensor (3) which responds to the start of the incident of the collected infrared rays to the infrared sensor (3) when positioned In addition to providing the infrared rays, the infrared sensor (3) changes the output in response to the start of incidence. Temperature detection means (34) an air conditioner for an infrared detection device, characterized in that provided for determining the temperature of the emitted radiation.