JPH04220225A - Vacuum cleaner - Google Patents

Abstract

PURPOSE:To eliminate the noise by generating a sound whose phase is opposite to that of a noise generated from the vacuum cleaner. CONSTITUTION:In a voice storage element 14a, a noise generated from the vacuum cleaner is stored in advance. By a voice synthesizing element 15a, a sound stored in the voice storage element 14a is synthesized, and by an opposite phase sound generating means 15, the phase of its sound is varied by 180 degrees. Its sound is amplified by an amplifier 15c, and by its sound signal, a vibrator 20 is vibrated by a driving device 21. Subsequently, the vibrator 20 abuts on a vacuum cleaner main body 10, vibrates the vacuum cleaner main body 10, allows it to generate a sound whose phase is opposite to that of a noise, and the noise is eliminated by allowing them to negate each other. Also, by a microphone 13a, a sound leaked to the outside from an exhaust port 17 is detected, and by a phase adjusting circuit 16a and an output adjusting circuit 16b, the sound generated by the opposite phase sound generating means 15 is adjusted so that its phase is different by 180 degrees from that of the noise generated from the vacuum cleaner.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise reduction mechanism for a vacuum cleaner.

0002

2. Description of the Related Art Active silencing is known as a measure to reduce noise in home appliances, in which noise is reduced by generating a sound that is 180 degrees out of phase with the generated noise.

For example, as shown in FIG. 4, it has been applied to reduce duct noise in air conditioners. That is, the noise inside the duct 1 is detected by the pickup microphone 2, the phase of the noise is changed by 180 degrees by the phase converter 3, and the amplifier 4 amplifies the noise, and the sound from the speaker 5 is outputted from the speaker 5 with a phase different from the noise by 180 degrees. to occur. Then, the waveform of the noise and the waveform of the sound from the speaker 5 cancel each other out, and the sound is muted.

[0004] Also, the feedback microphone 6 detects the sound left behind, and the phase and output adjusting means 7 shifts the phase or changes the amplification factor to eliminate the sound.

However, the above-mentioned method is not applied to vacuum cleaners, and noise reduction measures are taken such as installing soundproofing materials, sound-absorbing materials, sound-insulating materials, etc., and improving ventilation channels.

[0006]

However, conventional measures to reduce noise in vacuum cleaners hinder the reduction in weight and size of vacuum cleaners.

[0007] Therefore, if the above-described active noise reduction method is applied as is to a vacuum cleaner, there is a problem that there is no space for installing a speaker inside the vacuum cleaner because the interior space of the vacuum cleaner is narrow. Furthermore, even if a speaker can be installed inside, the sound emitted from the speaker and the noise will be combined, making it impossible for a pick-up microphone to pick up only the noise emitted from the vacuum cleaner, producing a sound with the opposite phase to the noise. Can not do it.

[0008] In view of the above, an object of the present invention is to provide a vacuum cleaner that can perform active noise reduction without using a speaker.

[0009]

[Means for Solving the Problems] A means for solving the problems according to claim 1 of the present invention is as shown in FIGS. 1 to 3.
a noise canceling device 11 that generates a sound whose phase is shifted by 180 degrees from the noise emitted from a vacuum cleaner; and the noise canceling device 1.
a sound generating device 12 that generates the sound generated by 1;
A noise detector 13 for detecting noise emitted from the vacuum cleaner is provided, and the noise canceling device 11 includes a sound storage means 14 for storing in advance the noise emitted from the vacuum cleaner, and a sound storage means 14 for storing noise emitted from the vacuum cleaner. an anti-phase sound generating means 15 that generates a sound whose phase is changed by 180 degrees, and the noise detector 1
A sound adjusting means 16 is provided for adjusting the phase and output of the sound generated by the anti-phase sound generating means 15 so that the noise is minimized by the sound signal from the sound signal from 3.

In claim 2, the sound generating device 12 includes a vibrator 20 that comes into contact with the vacuum cleaner body 10 to vibrate the vacuum cleaner body 10, and a vibrator 20 that vibrates the vacuum cleaner body 10 based on the output signal of the noise canceling device 11. It is composed of a drive device 21 that is driven by a motor.

[0011]

[Operation] In the above-mentioned means for solving the problem, the noise such as the sound from the electric blower and the exhaust sound generated during the operation of the vacuum cleaner is stored in advance in the sound storage means 14.

When the vacuum cleaner is operated, the antiphase sound generation means 15 changes the phase of the sound by 180 degrees based on the sound stored in the sound storage means 14 to make it an inverse phase, and this sound signal is sent to the sound generation device 12. is output to.

In the sound generating device 12, a current flows through the drive device 21 in accordance with the sound signal, and the vibrator 20 moves up and down, causing the vacuum cleaner main body 10 to vibrate like a speaker.

Further, the noise detector 13 detects noise leaking to the outside and measures its waveform and output. The sound adjustment means 16 is used to adjust the sound to be reproduced so that the phase is 180 degrees different from the noise emitted from the vacuum cleaner and the output is the same. Then, the drive device 21 of the sound generating device 12 is driven based on this adjusted signal, and the noise emitted from the vacuum cleaner main body 10 and the sound generated by the noise canceling device 11 are canceled out and muffled.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a control block diagram of a vacuum cleaner showing an embodiment of the present invention, FIG. 2 is a partially cutaway perspective view of the vacuum cleaner, and FIG. 3 is a sectional view of the sound generating device.

As shown in FIG. 1, the vacuum cleaner of this embodiment has a vacuum cleaner main body 10 which is equipped with noise emitted from the vacuum cleaner and 18
a noise canceling device 11 that generates a sound whose phase has changed by 0 degrees;
A sound generating device 12 that generates the sound generated by the noise canceling device 11 and a noise detector 13 that detects the noise emitted from the vacuum cleaner are provided. a sound storage means 14 that stores in advance the sound, and an anti-phase sound generation means 15 that generates a sound with the phase of the sound stored in the sound storage means 14 changed by 180 degrees;
A sound adjusting means 16 is provided for adjusting the phase and output of the sound generated by the anti-phase sound generating means 15 so that the noise is minimized by the sound signal from the noise detector 13.

The vacuum cleaner main body 10 has, as shown in FIG.
An electric blower (not shown) is arranged inside, and exhaust ports 17 are formed on both sides, forming a ventilation path from the electric blower to the exhaust port 17 through the rear part of the vacuum cleaner main body 10. .

A feedback microphone 13a serving as the noise detector 13 is installed in the vacuum cleaner main body 10 near the exhaust port 17.

The sound storage means 14 of the noise canceling device 11 is composed of a sound storage element 14a as shown in FIG. It is stored in the element 14a.

The anti-phase sound generating means 15 includes a speech synthesis element 15a that synthesizes a sound based on the sound stored in the speech storage element 14a, and a phase of the sound synthesized by the speech synthesis element 15a. It is composed of a phase conversion circuit 15b that changes the phase, and an amplifier 15c that amplifies the sound signal that has been made to have an opposite phase.

The sound adjustment means 16 performs phase adjustment to shift the phase of the phase conversion circuit 15b so that the sound is minimized according to the waveform of the noise detected by the feedback microphone 13a and output from the vacuum cleaner main body 10 to the outside. It is comprised of a circuit 16a and an output adjustment circuit 16b that increases or decreases the output by changing the amplification factor of the amplifier 15c.

[0022] The sound generating device 12 is connected to the vacuum cleaner main body 1.
A vibrator 2 that vibrates the vacuum cleaner main body 10 by coming into contact with
0 and a drive device 21 that drives the vibrator 20 based on the output signal of the noise canceling device 11, and is housed in a holding case 22 attached to the inner surface of the upper wall of the vacuum cleaner main body 10. .

As shown in FIG. 3, the drive device 21 consists of an annular magnet 23 fixed to a holding case 22 and a voice coil 24 wound around a vibrator 20. 20 is inserted. And the vibrator 20
is supported by a spring or the like with its upper end in contact with the upper wall of the vacuum cleaner main body 10.

In FIG. 2, 25 is a hose insertion port, and 26 is a hose insertion port.
27 is a bumper, 27 is a wheel, 28 is a main body lid, 29 is a storage chamber lid, and 30 is a handle.

In the above configuration, when the vacuum cleaner is in operation, noise such as the sound from the electric blower and exhaust noise is generated and leaks to the outside from the exhaust port 17. Since these sounds have a certain degree of constant waveform and sound pressure, they are stored in the sound storage element 14a in advance.
Remember it.

When the vacuum cleaner is activated, the voice memory element 14
A sound is synthesized by a speech synthesis element 15a based on the sound stored in a, and the phase of the sound is changed by 180 degrees by a phase conversion circuit 15b to make it an opposite phase. This sound signal is amplified by the amplifier 15c and output to the sound generator 12.

In the sound generating device 12, a current flows through the voice coil 24 of the drive device 21 in accordance with the sound signal, and the vibrator 20
moves up and down to vibrate the vacuum cleaner main body 10 like a speaker.

Further, the feedback microphone 13a arranged at the exhaust port 17 detects the noise leaking to the outside from the exhaust port 17, and measures its waveform and output. Using the phase adjustment circuit 16a and the output adjustment circuit 16b of the sound adjustment means 16, the phase conversion circuit 15b and the amplifier 15c are used so that the sound to be reproduced has a phase difference of 180 degrees from the noise emitted from the vacuum cleaner and the output is the same. Adjust. Then, the driving device 21 of the sound generating device 12 is driven based on this adjusted signal, and the noise emitted from the vacuum cleaner main body 10 and the sound generated by the noise canceling device 11 are canceled out and muffled.

Therefore, instead of using a speaker as the sound generating device 12, the vibrator 20 is used as the vacuum cleaner main body 10.
By vibrating and generating sound, electronically controlled active noise reduction can be applied to vacuum cleaners.

[0030] Therefore, compared to conventional techniques for making vacuum cleaners quieter (sound insulating materials, sound absorbing materials, sound insulating materials, improved ventilation channels, etc.), the manufacturing process can be simplified and the vacuum cleaner can be made lighter. I can do it.

Furthermore, by storing the noise of the vacuum cleaner in advance, there is no need to provide a pickup microphone, and the number of components for conventional active noise reduction can be reduced.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

[0033]

As is clear from the above description, according to claim 1 of the present invention, there is provided a noise canceling device that generates a sound whose phase is 180 degrees different from that of the noise emitted from a vacuum cleaner, and a noise canceling device that generates a sound that is 180 degrees out of phase with the noise emitted from a vacuum cleaner. a sound generating device that generates a sound;
A noise detector for detecting noise emitted from the vacuum cleaner is provided, and the noise canceling device includes a sound storage means for storing in advance the noise emitted from the vacuum cleaner, and a noise detector for detecting the noise emitted from the vacuum cleaner. An anti-phase sound generating means for generating a sound whose phase is shifted by 180 degrees, and adjusting the phase and output of the sound generated by the anti-phase sound generating means so that noise is minimized by the sound signal from the noise detector. Since the vacuum cleaner is equipped with a sound adjusting means, the noise emitted from the vacuum cleaner body and the sound generated by the noise canceling device and generated by the sound generating device cancel each other out and are muffled.

[0034] Therefore, compared to conventional techniques for making vacuum cleaners quieter (sound insulating materials, sound absorbing materials, sound insulating materials, improved ventilation channels, etc.), the manufacturing process can be simplified and the vacuum cleaner can be made lighter. can be achieved. Furthermore, by storing the noise of the vacuum cleaner in advance, there is no need to provide a pickup microphone, and the number of components for conventional active noise reduction can be reduced.

According to claim 2, instead of using a speaker as the sound generating device, electronically controlled active silencing can be applied to a vacuum cleaner by vibrating the vacuum cleaner body with a vibrator to generate sound. If this becomes possible, there will be excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a control block diagram of a vacuum cleaner showing one embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view of the vacuum cleaner.

FIG. 3 is a cross-sectional view of the sound generating device.

FIG. 4 is a diagram showing the principle of active silencing applied to an air conditioner.

[Explanation of symbols]

10 Vacuum cleaner body 11 Noise cancellation device 12 Sound generator 13 Noise detector 14 Sound storage means 15. Opposite phase sound generation means 16 Sound adjustment means 20 Vibrator 21 Drive device

Claims (2)

[Claims] 1. A vacuum cleaner body, a noise canceling device that generates a sound that is 180 degrees out of phase with the noise emitted from the vacuum cleaner, and a sound generating device that generates the sound generated by the noise canceling device. A noise detector for detecting noise emitted from the vacuum cleaner is provided, and the noise canceling device includes a sound storage means for storing in advance the noise emitted from the vacuum cleaner, and a noise detector for detecting the noise emitted from the vacuum cleaner. An anti-phase sound generating means for generating a sound whose phase is shifted by 180 degrees, and adjusting the phase and output of the sound generated by the anti-phase sound generating means so that noise is minimized by the sound signal from the noise detector. A vacuum cleaner characterized in that it has a sound adjustment means. 2. The sound generating device according to claim 1 comprises: a vibrator that comes into contact with a vacuum cleaner body to vibrate the vacuum cleaner body; What is claimed is: 1. A vacuum cleaner comprising: a drive device that drives the vacuum cleaner according to the invention;