JPH0938438A - Air purifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To unnecessitate the adjustment of an air purifying part on replacement of a dust sensor and besides to measure the dust concentration with accuracy. SOLUTION: A dust sensor 11 and an air purifying part 12 are connected by a connector 13, and also the dust sensor 11 is provided with an EEPROM 11b, and data required for a correcting treatment in the air purifying part 12 is stored in the EEPROM 11b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air purifying device, and more particularly, to a dust sensor that outputs a signal corresponding to the concentration of dust contained in the air, and dust based on the output signal from the dust sensor. The present invention relates to an air cleaning device having an air cleaning unit that performs a predetermined process for removal.

[0002]

2. Description of the Related Art Conventionally, a dust sensor that outputs a signal corresponding to the concentration of dust contained in air, and an air cleaning unit that performs a predetermined process for removing dust based on an output signal from the dust sensor. An air purifying device having is proposed. And, as a dust sensor, Japanese Patent Laid-Open No. 63-3268.
As shown in Japanese Patent Publication No. 7, a configuration in which externally adjustable resistors are provided at predetermined two positions of a three-stage amplifier circuit,
As disclosed in Japanese Examined Patent Publication No. 4-24654, a structure in which a light scattering member capable of adjusting the amount of light scattered from the outside of a dark box is provided outside the smoke detection region, and JP-A-5-18.
As disclosed in Japanese Patent No. 9676, a structure has been proposed in which unnecessary reflection light is removed by a level slice circuit and sensitivity adjustment is independently performed by an AC amplifier.

In any of these configurations, the characteristics of the dust sensor can be set to the desired characteristics by making necessary adjustments. Therefore, good air purification can be achieved by incorporating it into the air purification device.

[0004]

In any of the above configurations, it is necessary to replace the dust sensor incorporated in the air cleaning device at a certain cycle. In such a case, As described above, a dust sensor that is manufactured in advance and that exhibits desired characteristics by volume adjustment or the like is generally adopted. Therefore, due to the fact that the characteristics of the dust sensor are adjusted in advance so as to have the desired characteristics, it seems that no special adjustment work is required when replacing the dust sensor.

However, when looking at the individual manufactured dust sensors, since a considerably large variation in characteristics is observed in the as-manufactured state, they are not incorporated into an air normal device as they are, but generally Before the shipment of the dust sensor, volume adjustment or the like is performed to eliminate variations in characteristics. In order to eliminate the characteristic variations in this way, a high-density dust environment is artificially created, the dust sensor is positioned in the created dust environment, and the output of the dust sensor is the dust concentration (known It is necessary to adjust the volume so that the desired value is obtained according to the dust concentration).

However, it is extremely difficult to maintain a uniform dust concentration in an artificially produced dust environment, and
In reality, it is difficult to stabilize the output of the dust sensor when the dust sensor is positioned in such a dust environment. Therefore, in order to measure the output of the dust sensor with high accuracy, data processing such as averaging the output of the dust sensor sampled over a long period of time is essential. When adjusting using the volume, etc., it is necessary to constantly monitor the dust sensor output and adjust it to the desired characteristics, but try to calculate the average value to reduce the roughness of the dust sensor output. If so, the time required for measurement becomes long, and the time required for adjustment as a whole becomes extremely long. Also, as the adjustment work becomes complicated in this way,
Due to the extremely long adjustment time, the cost of the dust sensor increases significantly.

Further, when the characteristics of the dust sensor change with time, it is necessary to adjust the volume in accordance with the characteristics that have changed with time, and the same complicated adjustment work as the adjustment at the time of manufacture is required. This requires a significantly longer adjustment time.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is a first object of the present invention to provide an air purifying device which can eliminate the need for adjustment work when manufacturing a dust sensor. A second object of the present invention is to provide an air normal device that can eliminate the need for adjustment work when the characteristics of the dust sensor change with time.

[0009]

An air purifying device according to a first aspect of the present invention is a programmable ROM that can be erased as a dust sensor that outputs a signal corresponding to the concentration of dust contained in the air.
An erasable programmable ROM means that holds data necessary for the correction processing performed in the air cleaning section is adopted.

According to the second aspect of the present invention, there is provided an air purifying device in which data necessary for correction processing performed by the air purifying unit is written in programmable ROM means that can be erased by the air purifying unit. In the air purifying apparatus according to the third aspect, as the erasable programmable ROM means, one that holds data indirectly indicating the state of the dust sensor is adopted.

In the air purifying apparatus according to the fourth aspect, as the erasable programmable ROM means, a means for holding data directly indicating the state of the dust sensor is adopted. The air purifying device according to claim 5 is an erasable programmable RO.
As the M means, a means for holding at least a part of a program for receiving the output signal from the dust sensor and performing a predetermined process to remove dust in the air is adopted.

[0012]

According to the air purifying device of the present invention, the air purifying device outputs a signal corresponding to the concentration of the dust contained in the air, and an output signal from the dust sensor as an input to the air purifying device. An air cleaning unit that performs a predetermined process to remove dust, and a dust sensor has programmable ROM means that can be erased, and a correction process that the programmable ROM means that can be erased performs in the air cleaning unit. Since it holds the data necessary for the adjustment, it is not necessary to adjust the volume when the dust sensor is manufactured, and the correction process performed by the air cleaning unit by simply measuring the characteristics of the dust sensor is performed. Since it is only necessary to hold the necessary data in an erasable programmable ROM, the dust sensor can be used as an air cleaning device as compared with the case where volume adjustment is performed. Can significantly simplify the task until the embeddable state, it is possible to significantly shorten the time required. In addition, an erasable programmable ROM that holds data necessary for correction processing performed in the air cleaning unit when the characteristics of the dust sensor change with time.
Since the means is provided in the dust sensor, by reading the necessary data from the erasable programmable ROM means and performing the predetermined processing without changing the processing procedure, the processing content, etc. in the air cleaning section, It is possible to perform processing according to the characteristics of the dust sensor that have changed over time, and it is possible to achieve the desired air cleaning action.

According to the air cleaning apparatus of the second aspect, since the data required for the correction processing performed in the air cleaning section is written in the programmable ROM means that can be erased by the air cleaning section, the characteristics of the dust sensor are improved. When there is a change, the data required for the correction process can be written in the erasable programmable ROM means by operating the air cleaning device once. Therefore, it is possible to easily deal with a change with time in the characteristics of the dust sensor, and it is possible to always perform an optimal operation in accordance with the change with time.

In the air purifying apparatus according to the third aspect of the present invention, the erasable programmable ROM means employs one that holds data indirectly indicating the state of the dust sensor. Therefore, this data is used. It is possible to estimate the replacement time of the dust sensor, cope with a change in sensor sensitivity with time, and the like. According to the air purifying apparatus of claim 4, since the erasable programmable ROM means holds the data that directly indicates the state of the dust sensor, the data is used to detect the dust sensor. It is possible to estimate the replacement time and cope with a change in sensor sensitivity with time.

According to the fifth aspect of the present invention, there is provided at least one of programs for erasable programmable ROM means for performing a predetermined process for removing dust in the air using an output signal from the dust sensor as an input. Since the one that holds the parts is adopted, it is possible to easily change the processing contents in the air cleaning part by only changing the dust sensor by changing the program held in the erasable programmable ROM means. You can

[0016]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a plan view showing an internal mechanism of an embodiment of a photoelectric dust sensor applied to the present invention, and FIG. 2 is a schematic front view. This photoelectric dust sensor includes a substrate 1 on which a light emitting portion 1a including a light emitting diode and a first light receiving portion 1b including a photodiode are mounted, and a dark box (case body) 2. Here, as the substrate 1, for example, a printed wiring board made of glass epoxy can be exemplified, and as the dark box 2, for example, a box formed using an acrylonitrile butadiene styrene copolymer (hereinafter abbreviated as ABS) The body can be exemplified.

The dark box 2 is a cubic box as a whole, and a wall member extending upward is formed inside the dark box 2 to form a light emitting portion accommodating space 2a and a first light receiving portion accommodating space 2b. The lens system 2d is provided in the first light receiving portion accommodation space 2b.
Is provided. Then, the optical axis of the light emitting unit 1a and the lens system 2
The lens system 2d is arranged so that the optical axis of d forms a predetermined angle. Further, a hole for allowing the light emitting unit 1a to enter is formed in the inner depth of the light emitting unit housing space 2a, and on the optical axis of the lens system 2d, the inner depth of the first light receiving unit housing space 2b. A hole for allowing the first light receiving portion 1b to enter is formed therein. However, a lens system may be provided in the light emitting unit accommodation space 2a, or no lens system may be provided in either the light emitting unit accommodation space 2a or the first light receiving unit accommodation space 2b.

The light emitted from the light emitting portion 1a is prevented from being directly guided to the first light receiving portion 1b through the lens system 2d at an intermediate portion between the light emitting portion accommodation space 2a and the first light receiving portion accommodation space 2b. A light blocking member 2e is provided. Further, a noise light shielding member 2f for preventing light that may act as noise light from being guided to the first light receiving portion 1b through the lens system 2d includes a light emitting portion housing space 2a, a first light receiving portion housing space 2b, and a light shielding portion. It is provided at a position that substantially faces the member 2e. A plurality of noise light blocking members 2f are provided, and noise light blocking members 2f1 and 2f2 adjacent to each other are provided.
It constitutes the noise light attenuation room. The intensity of the light introduced into the noise light attenuation chamber is sufficiently attenuated by being reflected multiple times by the inner wall surface of the chamber where the light absorption is high. Further, a hole 2j for directly passing the light is formed at a predetermined position of the noise light blocking member (first plate member) 2f1 to which the direct light from the light emitting portion 1a is irradiated, and the noise light blocking member 2f1 is also formed. The plate member that defines the first light receiving unit accommodation space 2b and the outer wall member of the dark box 2 form an optical trap 2k. The noise light blocking member 2
The noise light blocking member 2f2 facing the f1 and the outer wall member of the dark box 2 located between the noise light blocking members 2f1 and 2f2 correspond to the second plate member.

Further, a slit portion 2g for releasing stress is formed at a predetermined position substantially facing the light shielding member 2e, and a predetermined position opposite to the light shielding member 2e with the base portion of the light shielding member 2e and the slit portion 2g interposed therebetween. Holes for screwing are formed in the substrate 1, and the substrate 1 is screwed through the holes by screws 2h. Further, an opening 2i for introducing a fluid is provided at a predetermined position near the tip of the light shielding member 2e. Needless to say, an opening (not shown) for introducing a fluid is also provided at a corresponding portion of the substrate 1.

The operation of the optical dust sensor having the above structure is as follows. The substrate 1 on which the light emitting portion 1a and the first light receiving portion 1b are mounted is brought into contact with the lower surface of the dark box 2, and in this state, the substrate 1 and the dark box 2 are integrally connected by a pair of screws 2h, whereby the optical Complete the assembly of the dust sensor. In this state, the relative positions of the light emitting unit 1a, the light blocking member 2e, the lens system 2d, and the first light receiving unit 1b are set as expected.

By disposing the photoelectric dust sensor thus assembled at a predetermined position, the concentration of smoke particles in the atmosphere to be measured can be measured as follows. When the atmosphere to be measured does not contain smoke particles at all, the light emitted from the light emitting portion 1a propagates linearly as it is, and due to the presence of the light shielding member 2e, the lens system 2d is not irradiated at all. As a result, the output signal from the first light receiving unit 1b remains small. At least a part of the linearly propagating light is introduced into the optical trap 2k through the hole 2j and is trapped therein to be attenuated almost completely. The rest of the linearly propagating light is sufficiently reflected by the noise light blocking members 2f1 and 2f2 and the outer wall member of the dark box 2 so as to be sufficiently attenuated. Therefore, the noise light caused by the direct light from the light emitting unit 1a hardly affects the first light receiving unit 1b.

FIG. 3 is a block diagram showing an embodiment of the air cleaning apparatus of the present invention. This air cleaning device has a dust sensor 11, an air cleaning unit 12, and a connector 13 that electrically connects the both. The dust sensor 11 is
The light emitting unit 1 includes the dust sensor shown in FIG.
A drive circuit (not shown) for driving a, the light receiving section 1b
It includes a sensor circuit 11a having an output circuit (not shown) for taking out a signal from, and an erasable programmable ROM (hereinafter abbreviated as EEPROM) 11b.

The air cleaning section 12 includes a power supply circuit 12e for supplying a driving voltage to the drive circuit through the connector 13, an oscillation circuit 12a for supplying a predetermined oscillation output to the sensor circuit 11a through the connector 13, and an output circuit through the connector 13. An A / D conversion circuit 12b for converting an output signal taken out from the input terminal into a digital signal and an EEPROM
An EEPROM control circuit 12c for writing, erasing, and reading data to and from 11b, and a power supply circuit 12
e, supplying a control signal to the oscillation circuit 12a,
Data is exchanged with the ROM control circuit 12c, and A
The digital signal from the / D conversion circuit 12b is input,
The control circuit 12d includes a control circuit 12d that performs a predetermined process determined based on the read data from the EEPROM 11b.
The air cleaning unit 12 further includes a dust removing unit (not shown) that operates based on a control signal from the control circuit 12d to remove dust in the air. Since the structure of the dust removing unit is conventionally known, detailed description thereof will be omitted.

The operation of the air purifying device having the above structure is as follows. (1) When the EEPROM 11b holds the offset voltage (data necessary for the correction processing) and the sensor sensitivity (data necessary for the correction processing) of the output of the dust sensor 11, the offset voltage is x, the sensor sensitivity is y, dust sensor 11
If the output of s is s, the dust concentration d in the air is calculated by calculating d = (s−x) / y. Since the offset voltage x and the sensor sensitivity y are held in the EEPROM 11b, the connector 13 and the A / D
The output s of the dust sensor 11 is taken into the control circuit 12d through the conversion circuit 12b, and the connectors 13 and E
EEPROM 11b through EPROM control circuit 12c
By taking in the offset voltage x and the sensor sensitivity y of the above and performing the calculation of the above equation in the control circuit 12d, it is possible to calculate the accurate dust concentration corrected based on the offset voltage and the sensor sensitivity. Therefore, when the dust concentration is high, the dust removing unit is operated so as to increase the dust removal efficiency, and conversely, when the dust concentration is low, the dust removing unit is operated so as not to increase the dust removal efficiency too much. As a result, the air cleaning operation can be performed according to the dust concentration in the air.

Further, when the dust sensor 11 is replaced, the offset voltage and the sensor sensitivity are automatically changed, so that the change processing for the air cleaning unit 12 can be completely eliminated. Here, the offset voltage is the EEP when the EEPROM 11b is incorporated in the dust sensor 11.
EEPROM1 which may be written in the ROM 11b
The dust sensor 11 having the built-in 1b may be incorporated in the air cleaning device and the offset voltage obtained by operating the air cleaning device may be written in the EEPROM 11b through the EEPROM control circuit 12c and the connector 13.

Further, in the offset voltage estimation processing, for example, the attenuation curve of the noise removal signal obtained by removing noise from the sensor output is proportional to the exponential function exp (-αt) (α is a constant, t is time). This can be achieved by obtaining the signal values of at least three points among the noise-removed signals. The reason why the dust sensor 11 needs to be replaced is as follows.

It is expected that the offset voltage and the sensor sensitivity will change due to adhesion of dirt to the lens system.
Among them, the fluctuation of the offset voltage can be corrected by calculating the offset voltage as described above, but it is difficult to correct the fluctuation of the sensor sensitivity. When the sensor sensitivity decreases, when the operating condition of the air cleaning device is automatically controlled according to the sensor output, the air cleaning efficiency of the air cleaning device does not increase even though the dust concentration is high. Similarly, automatic control is disabled even when the sensor output becomes constant regardless of the presence or absence of dust due to a sensor circuit failure. When the dust sensor is defective as described above, the dust sensor is replaced, and the air cleaning device can be normally operated.

Therefore, the dust sensor 11 needs to be replaced with a certain frequency. (2) When the EEPROM 11b holds the accumulated operating time of the dust sensor 11 and the transition of the characteristics of the dust sensor 11 Each time the air cleaning device is operated, the cumulative value of the measured dust concentration (the dust sensor The data indirectly indicating the state) is calculated by the air cleaning unit 12, added to the cumulative value of the dust concentration up to that point, and the cumulative added value is written and held in the EEPROM 11b.

When the sensitivity of the dust sensor 11 is remarkably lowered due to dirt, the automatic control of the air cleaning device cannot be normally performed as described above. Therefore, when the sensor sensitivity is lowered, the dust sensor should be replaced. Alternatively, it becomes necessary to perform a process of correcting a decrease in sensor sensitivity. However, when the dust sensor 11 is mounted on the air cleaning device, the dust concentration can be measured only by the dust sensor, and therefore the actual sensitivity of the dust sensor 11 cannot be measured. Therefore, regardless of whether the dust sensor 11 is replaced or corrected, it is necessary to estimate the degree of sensitivity deterioration by using data that is an index of dirt.

Here, it is considered that the dirt level of the dust sensor 11 depends on the dust concentration and the operating time during the operation of the air cleaning device. That is, as the dust concentration is higher and the operation time is longer, the dirt level of the dust sensor increases. Therefore, for example, if all the measured dust concentrations are cumulatively added, it can be estimated that the larger the cumulative addition value, the greater the degree of contamination of the dust sensor.

Specifically, for example, when the dust concentration is measured exponentially with time as shown in FIG. 4 and the dust concentration is measured once every 10 seconds, from the start of operation to the end of operation. The cumulative value of the dust concentration measured several times is calculated, and when the operation is completed, the EEPROM 11b
The accumulated value of this time is added to the accumulated value of the previous time stored in the.
Write to OM11b.

By performing this processing, the dirt on the dust sensor 11 can be evaluated more faithfully as compared with the case where the operating time is simply added. Therefore, the cumulative addition value is compared with a predetermined threshold, and when the cumulative addition value is larger,
It can be informed that the dust sensor 11 should be replaced. If the relationship between the dirt level of the dust sensor 11 and the decrease in sensor sensitivity can be expressed by a function, the sensor sensitivity can be corrected based on the cumulative addition value, and the correction is performed. By adopting the sensor sensitivity, the dust concentration can be accurately measured.

The offset voltage and the history of the sensor output are periodically written and held in the EEPROM 11b. It is assumed that it is possible to determine that the reliability of the dust sensor 11 is deteriorated when the current characteristics largely deviate from the characteristics measured at the time of adjustment due to the deterioration of the dust sensor 11 with time. In this case, the reliability of the dust sensor 11 can be evaluated by the fluctuation range of the offset voltage of the dust sensor 11. Also, based on such evaluation,
The following processing can be performed.

For example, as shown in FIG. 5, four air cleaning devices equipped with the dust sensors 11 are arranged in one room, and the output of each dust sensor 11 is d1, d2, d3.
In the case of d4, for the air purifying device equipped with the dust sensor 11 that outputs d1, Z = 10 * d1 + 5 * d2 + 5 * d3 + 4 * d4 is calculated, and the value of Z is compared with a predetermined threshold value. The air purifier is preset to control the ON / OFF of the corresponding air purifier depending on its size, and for the air purifier equipped with the dust sensor that outputs d2, Z = 10 * d2 + 5 * d1 + 5 * d4 + 4 * d3 It is preset to perform a calculation, compare the value of Z with a predetermined threshold value, and ON / OFF control the corresponding air cleaning device depending on the magnitude of the Z value, and set the same for other air cleaning devices. If you adopt a system,
The offset voltage of each dust sensor 11 was 1.5, 1.0, 1.5, and 2.0 V in the initial stage.
If the voltage becomes 3.5, 1.2, 1.5, 1.9V, it can be seen from the data written in the EEPROM 11b that the offset voltage of the first dust sensor 11 has fluctuated significantly. In the equation for calculating, the contribution of the first dust sensor 11 is reduced and the contribution of the other dust sensors 11 is increased (for example, Z = 7 for an air cleaning device equipped with a dust sensor that outputs d1). * D
By setting 1 + 6 * d2 + 6 * d3 + 5 * d4), the influence of the error included in the output from the first dust sensor 11 can be reduced.

Further, the output of the dust sensor 11, the offset voltage, etc. are periodically written in the EEPROM 11b, and a plurality of data are written in the EEPROM 11 in order from the latest data.
If it is held at b, it is possible to easily find an abnormality in the output voltage due to a contact failure of the connector. Further, the maximum value, the minimum value, the average value of the output voltage of the dust sensor 11, the operating time of the dust sensor 11, the cumulative addition value of the dust concentration, and the like are stored in the EEPROM 11b as a history so that the characteristics of the dust sensor 11 can be improved. It is possible to know how things are changing, and it is possible to detect failures and speed up countermeasures. Furthermore, it is possible to store useful data in the EEPROM 11b in order to find and improve software defects.

(3) When the dust sensor 11 is adjusted, software describing the contents of calculation in the air cleaning section 12, the oscillation frequency, and the upper limit of the cumulative value of dust concentration are set to the EEPROM 11b.
If you want to keep it. When a problem occurs in the air cleaning device that does not have the function of correcting the decrease in sensitivity of the dust sensor 11 and it becomes necessary to add a function of correcting the decrease in sensitivity, the decrease in sensitivity is corrected. The calculation formula for calculating the dust concentration is different between the case where the function does not have and the case where the function has the function of correcting the decrease in sensitivity. Therefore, the data corresponding to this arithmetic expression (the arithmetic expression itself may be used, or the coefficient of the arithmetic expression may be used) is stored in the EEPROM 1.
1b, the control circuit of the air cleaning unit reads out the data corresponding to the arithmetic expression and performs a predetermined process, so that the air cleaning unit is not subjected to any processing. The function change described above can be achieved by simply replacing the dust sensor 11.

Further, since it is data necessary for noise removal by phase detection and noise of the same frequency as the oscillation frequency cannot be removed, it is necessary to change the oscillation frequency depending on the frequency of the noise to be removed. Therefore, in order to deal with such a case, the oscillation frequency is held in the EEPROM 11b. The upper limit value of the cumulative value of the dust concentration is used, for example, to determine the replacement timing of the dust sensor 11, and in order to improve the calculation accuracy of the replacement timing, the upper limit value of the dust concentration must be changed. I won't. Therefore, in order to deal with such a case, the upper limit value of the dust concentration is held in the EEPROM 11b.

Further, among the functions of the air cleaning section, the EEPROM 11 may be changed from the beginning or when it is necessary to change the section that may be changed in the future.
By installing the software in b, it is possible to easily deal with version upgrades. Furthermore, in these cases, when writing the value measured in the air cleaning section to the EEPROM 11b, if the average value of a plurality of measured values is written, the output of the dust sensor 11 can be measured when the ambient environment is bad. Even when the accuracy is poor, the deterioration of the adjustment accuracy can be significantly suppressed.

[0039]

According to the present invention, when the dust sensor is replaced, the dust sensor is provided with erasable programmable ROM means for holding data necessary for the correction process performed in the air cleaning section. Therefore, without changing the processing procedure and processing contents in the air cleaning section,
By reading necessary data from the erasable programmable ROM means and performing a predetermined process, it is possible to perform a process according to the characteristics of the dust sensor, and to achieve a desired air cleaning action. Produce an effect.

According to the second aspect of the present invention, it is not necessary to write the data required for the correction processing in the erasable programmable ROM means at the time of incorporating the erasable programmable ROM means in the dust sensor, and the air cleaning is performed once. By operating the device, there is a unique effect that the data required for the correction process can be written in the erasable programmable ROM means.

The invention of claim 3 is peculiar in that the data held in the erasable programmable ROM means can be used to estimate the replacement time of the dust sensor and to cope with a change in sensor sensitivity with time. Produce an effect. According to the invention of claim 4, as the erasable programmable ROM means, the one which holds the data directly indicating the state of the dust sensor is adopted, and therefore the estimation of the replacement time of the dust sensor is carried out using this data. The unique effect is that the sensor sensitivity can be dealt with over time.

According to the fifth aspect of the present invention, by changing the program held in the erasable programmable ROM means, it is possible to easily change the processing content in the air cleaning section by only replacing the dust sensor. There is a unique effect.

[Brief description of drawings]

FIG. 1 is a plan view showing an internal mechanism of an example of a photoelectric dust sensor.

FIG. 2 is a schematic front view of the same.

FIG. 3 is a block diagram showing an embodiment of the air cleaning apparatus of the present invention.

FIG. 4 is a diagram showing a change characteristic of dust concentration.

FIG. 5 is a schematic diagram showing an example of an arrangement of dust sensors.

[Explanation of symbols]

 11 Dust Sensor 11b EEPROM 12 Air Cleaner

Claims (5)

[Claims] 1. A dust sensor (11) for outputting a signal corresponding to the concentration of dust contained in air, and a dust sensor (1).
In an air cleaning device having an air cleaning section (12) which receives an output signal from (1) as an input and performs a predetermined process to remove dust in the air, the dust sensor (11) can be erased by programmable ROM means (11b). ) And erasable programmable ROM means (11b)
Holds the data necessary for the correction processing performed by the air cleaning unit. 2. The air cleaner according to claim 1, wherein the data necessary for the correction processing performed by the air cleaner (12) is written in the erasable programmable ROM means (11b) by the air cleaner (12). apparatus. 3. The air cleaning apparatus according to claim 1, wherein the erasable programmable ROM means (11b) holds data indirectly indicating the state of the dust sensor (11). 4. The air cleaning apparatus according to claim 1, wherein the erasable programmable ROM means (11b) holds data that directly indicates the state of the dust sensor (11). 5. An erasable programmable ROM means (11b) holds at least a part of a program for receiving a signal output from a dust sensor (11) and performing a predetermined process to remove dust in the air. The air purifying apparatus according to claim 1, which is for