JPH08196844A - Air cleaner - Google Patents

Abstract

PURPOSE: To provide an air cleaner with the detecting accuracy of its sensor- enhanced by making the output of the sensor for detecting dust adjustable even after the main body is completed. CONSTITUTION: The output of a sensor 1 for detecting dust is amplified with an amplification part 2, and the output voltage of the amplification part 2 is inputted to a micrprocessor 5. When the microprocessor 5 enters an adjustment mode, the number of lit lamps of an indicating means 6 is changed in accordance with the output voltage of the amplification part 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air cleaner for collecting dirt in the air and to an output adjusting means of a sensor for detecting dirt.

[0002]

2. Description of the Related Art As for the output of a sensor mounted in a conventional air purifier, for example, in the case of a dust sensor, the output voltage with respect to the amount of dust changes substantially linearly as shown in FIG. Then, when trying to capture the range of change of dust amount from 0 to 1.0 mg / cubic meter, the output voltage of the sensor is usually input to the microprocessor.
Although the voltage range is up to 5V, even when the dust amount is 0 mg / cubic meter, the offset voltage of the amplifier such as the operational amplifier incorporated in the dust sensor is output, and as shown by the line (A) in the figure. Since the output voltage does not become 0 V, the dust amount of 0.8 to 1.0 mg / cubic meter cannot be identified. Therefore, it is general to adjust the output voltage to 0 V when the dust amount is 0 mg / cubic meter as shown by the line (B) in the figure.

[0003]

However, if such an adjustment is attempted, the output voltage of the sensor must be monitored. Therefore, the adjustment cannot be performed in the state of a finished product in which the sensor is incorporated in the product, and the detection of the sensor is not possible. There was a problem that the accuracy deteriorated.

An object of the present invention is to solve these problems and to provide an air purifier with improved sensor detection accuracy.

[0005]

The first means of the present invention for attaining the above object is to provide a plurality of display means and adjust the output voltage of an amplifying section for amplifying the output of the sensor to a constant value. At this time, the display means is provided with means for making the display lighting levels corresponding to the output voltage of the amplifying section correspond to each other and determining the adjustment voltage according to the number of lighting.

The second means is provided with a display means, and when the output voltage of the amplification section for amplifying the output of the sensor is adjusted to a constant value, a display corresponding to the output voltage of the amplification section is displayed on the display means. A means is provided for associating the blinking times and determining the adjustment voltage according to the blinking times.

[0007]

According to the first means of the present invention, since adjustment can be performed while monitoring a plurality of display means, it is possible to perform adjustment while being incorporated in the product body.

Further, according to the second means, if there is a single display means, it is possible to perform adjustment in a state of being incorporated in the product body.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG. In the figure, reference numeral 1 is a sensor, the output of which is connected to an amplifier 2. The amplification unit 2 is a general amplification circuit composed of an operational amplifier 3, and is provided with an adjustment volume 4 for adjusting the output of the operational amplifier 3 when the sensor 1 is dust-free to 0V. The output of the amplification unit 2 is input to the microprocessor 5, and the display unit 6 is turned on according to the input voltage. As shown in FIG. 2, the display unit 6 is configured to sequentially turn on the stain amount of the sensor 1 in 1 to 4 stages according to the stain amount.

The operation of the above configuration will be described. Normally, the display means 6 is turned on according to the input voltage of the microprocessor 5, that is, the degree of dirt. However, when adjusting the output voltage of the sensor 1 when there is no dust, the switch attached to the product is pressed. It means entering the adjustment mode such as turning on the power of the product.

At this time, according to the input voltage of the microprocessor 5, the display means 6 displays the input voltage of 0.
If the number of displays is one when the voltage is 5 V and two when the voltage is 1 V, the output voltage of the amplification unit 2 when dust-free is 0.
When adjusting between 5 and 1.0 V, the adjustment volume 4 should be adjusted so that only the display unit 1 is turned on.

Next, a second embodiment of the present invention will be described. Here, the display means 6 is a single piece, and the blinking time is 0.5 seconds and 1V when the input voltage is 0.5V as shown in FIG.
If the output voltage of the amplifying section 2 when there is no dust is adjusted between 0.5 and 1.0 V, the display means 6 is set to blink for 1 second. As described above, the adjustment volume 4 should be adjusted. Further, as in the first embodiment, even when the display means 6 uses a plurality of indicator lights, at least one of the indicator lights is used as the amplifying section 2.
The blinking time may be changed according to the output voltage of the.

[0013]

As is apparent from the above embodiments, the first
According to the above means, the number of lighting means for displaying the dirt is changed according to the output voltage of the sensor, so that the sensor can be adjusted accurately even when the main body is completed, and an air purifier without malfunction can be provided. .

Further, according to the second means, since the display blinking cycle of the display means for displaying the dirt is changed according to the sensor output, it is possible to adjust even the display means with one indicator light or the display means with a simple structure. Can be done.

[Brief description of drawings]

FIG. 1 is a block diagram of an air purifier showing a first embodiment of the present invention.

FIG. 2 is a front view showing a stain amount display unit in the embodiment.

FIG. 3 is a diagram showing the relationship between the number of display units and the input voltage in the same embodiment.

FIG. 4 is a diagram showing the relationship between the display blinking time of the display means of the air cleaner and the input voltage according to the second embodiment of the present invention.

FIG. 5 is a diagram showing the relationship between the dust amount and the output voltage of the air purifier.

[Explanation of symbols]

 1 Sensor 2 Amplifying Section 5 Microprocessor 6 Display Means

Claims (2)

[Claims] 1. An amplifier for mounting a sensor for detecting dirt in the air, providing a plurality of display means for displaying the air volume and the dirt level in the air according to the value of the output of the sensor, and amplifying the output of the sensor. When adjusting the output voltage of the part to a constant value,
An air purifier comprising means for making the display means correspond to display lighting levels corresponding to the output voltage of the amplifying section, and for determining the adjustment voltage depending on the number of lighting. 2. An output of an amplifying section for mounting a sensor for detecting dirt in the air, providing display means for displaying an air volume and a dirt degree in the air according to an output value of the sensor, and amplifying an output of the sensor. An air purifier provided with means for causing the display means to correspond to a display blinking time corresponding to the output voltage of the amplifying unit when the voltage is adjusted to a constant value, and determining the adjusted voltage according to the blinking time.