JPH03212249A - Floor surface judging device - Google Patents

Abstract

PURPOSE:To judge the kind of a cleaning object surface by detecting the reverberation vibration of a dripproof type ultrasonic microphone and measuring the continuation time of the reverberation vibration and comparing the measurement time with a prescribed time by a judging means. CONSTITUTION:A dripproof type ultrasonic microphone 4 whose vibration surface is directed to a cleaning object surface 3 is installed in vertically slidable manner on a sliding guide 2 which is constituted of the bottom surface of a floor nozzle 1. When the dripproof type ultrasonic microphone 4 is vibrated for a certain time t0 by a vibrating means 6, in the case of the cleaning object surface 3 of a carpet, the contact pressure applied on the vibration surface of the microphone 4 is small, and a wave shape B is generated. In the case of a wooden floor, the contact pressure increases, and the reverberation is prevented, and a wave shape D is generated, while in the case of a 'tatami' mat, the intermediate wave form C is generated. Each wave shape B, C, D which is received is detected by a receiving means 7, and outputted as each wave shape E, F, G and a measuring means 8 measures the reverberation continuation time t1-t3 from the vibration completion time point of the ultrasonic wave, and the measurement time is compared with a prescribed time by a judging means 9, and the kind of the cleaning object surface 3 is judged.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a floor surface discriminating device mounted in a floor nozzle of a suction type vacuum cleaner.

Conventional technology Conventionally, this type of floor surface identification device using ultrasonic waves emits ultrasonic waves from an ultrasonic microphone toward the surface to be cleaned, measures the strength of the received intensity of the reflected waves, and detects the surface to be cleaned. The type was determined.

Problems to be Solved by the Invention This conventional method requires a certain distance between the ultrasonic microphone and the surface to be cleaned, and also requires an acoustic horn to efficiently transmit and receive ultrasonic waves from the ultrasonic microphone. Therefore, it was difficult to install it in the floor nozzle, and the floor nozzle had to be thick.

The present invention is intended to solve the problems of the conventional structure, and aims to provide a floor surface discriminating device that is small and can be stored in a floor nozzle.

Means for Solving the Problems In order to achieve the above object, the present invention provides a drip-proof ultrasonic microphone configured on the surface to be cleaned inside a floor nozzle of a suction-type vacuum cleaner, and a drip-proof ultrasonic microphone. an elastic body that applies constant pressure to the surface to be cleaned; a vibrator that vibrates the drip-proof ultrasonic microphone; and a vibrator that receives reverberant vibrations of the drip-proof ultrasonic microphone vibrated by the vibrator. A floor surface discriminating device comprising a receiving means, a measuring means for measuring the duration of reverberant vibrations received by the receiving means, and a discriminating means for discriminating the type of surface to be cleaned from the measurement time of the measuring means. It is.

Effect According to the above technical means, since the drip-proof ultrasonic microphone is pressed against the surface to be cleaned by the elastic body, the reverberant vibration of the drip-proof ultrasonic microphone vibrated by the vibration means depends on the condition of the surface to be cleaned. Change. That is, if the surface to be cleaned is made of a hard material such as a wooden floor or tatami mat, the duration of the reverberant vibration is short, whereas if the surface is a carpet, the material is soft and the duration of the reverberant vibration is long. The reverberant vibration of this drip-proof ultrasonic microphone is detected by the receiving means, and the duration time of the reverberant vibration is measured by the measuring means, and the measured time is compared with a predetermined time by the determining means. This is vh for determining the type of.

In addition, a drip-proof ultrasonic microphone is constructed so that the outer casing itself generates ultrasonic vibrations, making it resistant to rain, and has recently been used in automobile back-up sonar, etc. It is.

An example of an application of this floor surface discriminator is the automatic control of a suction type vacuum cleaner, in which the material of the surface to be cleaned is determined and the power of the floor nozzle or fan motor is controlled. In other words, if the carpet is detected, the agitator in the floor nozzle is rotated and the fan motor is rotated with strong power, and if the floor is determined to be a wooden floor or P-tile, the agitator is not turned and the fan motor is rotated with weak power to clean it. This means that the cleaning conditions can be automatically controlled to be optimal for the target surface.

EXAMPLE Hereinafter, an example of the present invention will be explained based on FIGS. 1 and 2. In Fig. 1, a drip-proof ultrasonic microphone 4 with its vibrating surface facing the cleaning target surface 3 is configured to be slidable up and down on a sliding guide 2 configured on the bottom surface 1 of the floor nozzle. It is configured to be biased toward the surface to be cleaned 3 by an elastic body 5, which is a coil spring, and to be in pressure contact with the surface to be cleaned 3 when in use.

The drip-proof ultrasonic microphone 4 is connected to an excitation means 6 for vibrating the drip-proof ultrasonic microphone 4, and receives reverberant vibrations of the drip-proof ultrasonic microphone 4 vibrated by the excitation means 6. It is also connected to receiving means 7. Further, the excitation means 6 and the receiving means 7 are both connected to a measuring means 8 that measures the duration of the reverberant vibrations received by the receiving means 7, and the measuring means 8 determines the type of cleaning surface from the measured time of the measuring means 8. It is connected to a discriminating means 9 for discriminating.

Next, the operation of this configuration will be explained with reference to FIG. 2 as well. The drip-proof ultrasonic microphone 4 is moved by the vibrating means 6 for a certain period of time t. When vibration is applied (waveform A in Figure 2), this time t
. Thereafter, the vibration of the drip-proof ultrasonic microphone 4 continues. This vibration without excitation is reverberation, and can be said to be a state in which reverberant vibration remains. The duration of this reverberant vibration is the mechanical vibration inherent in the drip-proof ultrasonic microphone 4, and the received waveform of the receiving means 7 (waveform B and waveform C in Figure 2)
・Can be detected as waveform D). If the cleaning surface 3 is a carpet, the contact pressure applied to the vibrating surface of the drip-proof ultrasonic microphone 4 is small, so reverberation is not suppressed, resulting in waveform B. Furthermore, when the surface 3 to be cleaned is a wooden floor, this contact pressure increases, suppressing reverberation and creating a waveform. If the surface to be cleaned 3 is a tatami mat, the waveform C is
becomes. The received waveform B, waveform C, and waveform RI are similarly detected by the receiving means 7 and outputted to the measuring means 8 as waveform E, waveform F, and waveform G, respectively. The measuring means 8 receives the waveform E, waveform F and waveform G which are the outputs of the receiving means 7, compares them with a certain threshold level H, and calculates the reverberation duration tI - t2 from the end of ultrasonic excitation. - By measuring t3, the determination means 9 compares this measured time with a predetermined time to determine the type of surface 3 to be cleaned.

Our EFR-R is a drip-proof ultrasonic microphone 4.
The measurement time will be described below when QB40 is 32, the excitation time is 2 (mS), and the biasing force by the elastic body is 100100 (.

Effects of the Invention As described above, according to the present invention, since the drip-proof ultrasonic microphone is constructed by urging it toward the target floor surface using an elastic body, a horn or the like is not required. Because the nozzle does not cover the floor nozzle, it can be stored in a small space within the floor nozzle. In addition, a drip-proof ultrasonic microphone is directly pressed against the surface to be cleaned, and the type of surface to be cleaned is determined based on the reverberation time.The system receives reflected waves of ultrasonic waves and identifies the target floor surface from the reflected waves. This is very different from the method used to do this. As can be seen from the data, it is possible to distinguish between three types of surfaces to be cleaned: carpet, wooden floor, and tatami mats.If applied to the automatic control of a suction-type vacuum cleaner, it is possible to distinguish between three types of surfaces to be cleaned. This means that floor nozzles and fan motors can be automatically controlled under optimal cleaning conditions. Furthermore, since the drip-proof ultrasonic microphone is constantly and intermittently vibrated, the gaps between the sliding parts are less likely to be clogged with dust, making it industrially useful.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, and FIG. 2 is a measurement waveform diagram of the same ultrasonic wave. 4... Drip-proof ultrasonic microphone, 5... Elastic body,
6... Vibrating means, 7... Receiving means, 8... Measuring means, 9...'#Another thousand means

Claims (1)

[Claims] A drip-proof ultrasonic microphone configured on the surface to be cleaned inside the floor nozzle of a suction-type vacuum cleaner, an elastic body that urges this drip-proof ultrasonic microphone against the surface to be cleaned with a constant pressure, and this barrier. A vibrating means for vibrating a drop-type ultrasonic microphone, a receiving means for receiving reverberant vibrations of the drop-proof ultrasonic microphone vibrated by the vibrating means, and a duration time of the reverberant vibrations received by the receiving means. a measuring means;
A floor surface discriminating device comprising a discriminating means for discriminating the type of surface to be cleaned from the measurement time of the measuring means.