JPH0484921A - Vacuum cleaner - Google Patents

Abstract

PURPOSE:To muffle such noises as a suction/exhaust sound, and a rotation sound of a motor and a fan generated in the course of using a cleaner by providing a muffling device consisting of an acoustic pressure sensing part, an electric signal analysis processing part, and a piezoelectric film on the vacuum cleaner. CONSTITUTION:An acoustic pressure sensing part microphone 12 in a floor nozzle 10 or in a main body 1 senses an acoustic pressure of a suction/ exhaust sound and a rotation sound of a motor, etc., converts it to an electric signal for indicating a waveform A and outputs it. An electric signal analysis processor 13 analyzes its signal waveform, generates an electric signal waveform whose phase is shifted from this signal waveform by 180 degrees, and sends it to a piezoelectric film in the main body 1 and in a pipe. The piezoelectric film is a kind of loudspeaker, converts this electric signal to an acoustic pressure level B as shown in Fig 3 and outputs it. Thus, a sound generated from the cleaner in the course of cleaning becomes a sound of an acoustic level C. That is, a noise is muffled and becomes the sound of a low acoustic pressure level.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to silencing or making noise generated when using a vacuum cleaner.

[Prior Art] Fig. 5 is a side view of a conventional vacuum cleaner disclosed in, for example, Japanese Utility Model Publication No. 58-17588, in which (1) indicates the main body;
(2) is the fan built into the main unit, (3) is the motor that drives fan (2), (4) is the dust collection chamber, (5) is the filter, (6) is the intake port, (7) is Exhaust port, (8) is a hose, (9) is a pipe, (10> is a floor nozzle, (11)
is a switch.

Next, the operation of the vacuum cleaner will be explained. Switch (1
When 1) is turned ON, the motor (3) inside the main unit starts,
Fan (2) starts rotating. In this state, the floor nozzle (1
0) on the floor, air containing dust is sucked from the floor nozzle (lO), and the air is sucked into the dust collection chamber (4) via the pipe (9) and hose (8). After being filtered by the filter (5), only the air is discharged to the outside air from the exhaust port (7), and the dust is collected in the dust collection chamber (4). The collected waste will be disposed of later. This is how a vacuum cleaner works.

[Problem to be solved by the invention] By the way, while using the vacuum cleaner, the vacuum cleaner motor (
3) and the rotating sound of the fan (2), the floor nozzle (10),
Intake pipe (9) The sound generated by the air flow passing through the hose (8), dust collection chamber (4), filter (5), or exhaust port (7) generates considerable noise, making it difficult to use a vacuum cleaner. This noise not only causes discomfort to the user, but also to the people around them, and eliminating this noise or making it a real sound has been a challenge for some time.

The present invention has been made to solve the above-mentioned problems of conventional vacuum cleaners, and it reduces the monotonous and noisy noise that causes discomfort to the surroundings, generates refreshing sounds such as light melodies, and generates electricity. To provide a vacuum cleaner that eliminates or alleviates discomfort experienced during use of the vacuum cleaner.

[Means for Solving the Problem] In order to achieve the above object, the vacuum cleaner according to the present invention has the following features:
Noise generated when using a vacuum cleaner, such as the rotating sound of the motor or fan, or the sound of air intake and exhaust, is detected within the main body or pipes, the noise is analyzed, and a sound wave with the opposite phase to the noise is generated. It is equipped with a silencer configured to cancel out noise using sound waves of opposite phase.

In addition to the above-mentioned muffling device, it is also equipped with a refreshing sound generating device that generates real sounds such as exhilarating melodies.

[Function] Since the vacuum cleaner is equipped with a noise reduction device, most of the noise generated during use of the vacuum cleaner is eliminated by the noise reduction device, reducing the noise level and reducing the discomfort caused to the user of the vacuum cleaner and the people around the vacuum cleaner. is greatly reduced.

Furthermore, by adding a refreshing sound generating device, it gives a refreshing feeling to the user of the vacuum cleaner and the people around him.

[Embodiment of the Invention] Fig. 1 is a side view of a vacuum cleaner equipped with a noise reduction device showing an embodiment of the present invention, and in the figure (1) to (11) are the same or equivalent parts as in a conventional vacuum cleaner. , (12) is the sound pressure detection section, (
13) is an electric signal analysis processing section, and (14) is a piezoelectric film.

The noise reduction device for a vacuum cleaner according to the present invention includes the above-mentioned sound pressure sensing section (microphone) (12) and an electrical signal analysis processing section (13).
and a piezoelectric film (14), and as shown in the figure, the sound pressure sensing part (microphone) (12) is placed in the floor nozzle (lO) and the main body (1), and the electrical signal analysis processing is performed. The part (13) is located inside the main body (1) and also includes a piezoelectric film (
14) is arranged within the body (1) and the pipe (9).

The sound pressure sensor (microphone) (12) is a device that detects air intake and exhaust sounds and the rotation sounds of motors and fans, and converts the sound pressure into electrical signals.The electrical signal analysis processing section (13) The sound pressure electrical signal is read, and 18
This is a device that generates electrical signals with an antiphase of 0 degrees.

Further, the piezoelectric film (I4) is a device having a speaker function that outputs the opposite phase signal as sound pressure.

Next, the operation will be explained. The sound pressure sensing part (microphone) (12) inside the floor nozzle (10) or inside the main body (1) is
When the sound pressure of the intake/exhaust sound or the rotation sound of a motor is sensed, the sound pressure is converted into an electrical signal representing a waveform as shown in FIG. 2, for example, and output. Electrical signal analysis processing device (13)
inputs this electrical signal, analyzes the signal waveform, generates the electrical signal waveform shown in Figure 3 that is 180 degrees out of phase with this signal waveform, and applies it to the piezoelectric film inside the main body (1) and the pipe. send.

The piezoelectric film (14) is a type of speaker, which converts this electrical signal into a sound pressure level as shown in FIG. 3 and outputs it. As a result, the sound pressure level shown in Fig. 2 is overlapped with the sound pressure level shown in Fig. 3 with a phase shift of 180 degrees, and the sound generated by the vacuum cleaner during cleaning has the waveform shown in Fig. 2. The sounds shown in FIG. 3 are synthesized to produce the sound pressure and bell sound shown in FIG. 4. That is, the noise as shown in FIG. 2 is muted and becomes a sound with a low sound pressure level as shown in FIG. 4. Therefore, noise such as intake/exhaust noise when using a vacuum cleaner and rotational noise of a motor, fan, etc., is almost eliminated, and the discomfort caused by the noise is also eliminated.

The specifications of the sound pressure sensing section (12) and the electrical signal analysis processing device (engineering section 3) in the above embodiment are not particularly limited, and commercially available ones may be used or newly designed ones may be used. . However, it is preferable that it be as small and lightweight as possible.

In addition, as for the piezoelectric film used to generate the muffling sound waves, film-shaped speakers that can be transformed into various shapes and used are already commercially available, so we use them.
The piezoelectric film (14) may be placed within the body (1) or the vibrator (9) as appropriate.The piezoelectric film (14) is not limited to the body (1) and the vibrator (9), but may be placed in any position that is considered effective. Further, the silencing sound wave generating means is not limited to a piezoelectric film, and may be a speaker using an electromagnetic coil.

Furthermore, by adding a music signal, such as a light melody signal, to the electrical signal of the muffling sound waves, unpleasant noises can be muffled while cleaning, and the user can enjoy refreshing music.

Furthermore, by connecting the above-mentioned silencer to an audio device, it is possible to use the vacuum cleaner as a speaker.

[Effects of the Invention] The present invention provides a vacuum cleaner with a sound pressure sensing section (microphone), an electrical signal analysis processing section, and a sound damping device made of a piezoelectric film, so that air absorption generated during use of the vacuum cleaner is prevented. Noises such as exhaust noise, motor, fan rotation, etc. are silenced, resulting in an excellent effect in eliminating the discomfort caused to the user of the vacuum cleaner and the people around them.

Furthermore, by adding a melody signal or the like to the electric signal of the muffling sound waves of the above-mentioned muffling device, it has become possible to eliminate the discomfort caused by noise during cleaning and to enjoy exhilarating music.

[Brief explanation of drawings]

FIG. 1 is a side view of a vacuum cleaner that is an embodiment of the present invention;
Fig. 2 is a diagram showing the sound pressure level of the noise generated by a vacuum cleaner, Fig. 3 is a diagram showing the sound pressure level of the muffling sound wave whose phase is shifted by 180 degrees with respect to the sound pressure waveform of the above noise, and Fig. 4 is a diagram showing the sound pressure level of the noise generated by the vacuum cleaner. Figure 5 is a diagram of the sound pressure level of the sound waves generated by a silenced vacuum cleaner.
The figure is a side view of a conventional vacuum cleaner. In the figure, (1) is the main body, (2) is the fan, (3) is its motor, (9) is the vibrator, (10) is the floor nozzle, (12)
(13) is the sound pressure detection section, (13) is the electrical signal analysis processing section, (14)
) is a piezoelectric film. Note that the same reference numerals in the figures indicate the same or equivalent parts. Figure 2 □ Phase (or time) Figure 3 δ−υ? −/''/ Agent Patent Attorney Souji Sasaki 111 Phase (or time) Figure 4

Claims (2)

[Claims] (1) In a vacuum cleaner, a sound pressure sensing means that senses the noise generated by the vacuum cleaner and converts the sound pressure into an electrical signal; and a sound pressure sensing means that reads the electrical signal and has a phase opposite to that electrical signal. 1. A vacuum cleaner comprising: a means for generating an electric signal; and a means for generating the opposite-phase electric signal as a sound pressure. (2) In a vacuum cleaner, a sound pressure sensing means that senses the noise generated by the vacuum cleaner and converts the sound pressure into an electrical signal; and a sound pressure sensing means that reads the electrical signal and has a phase opposite to that of the electrical signal. a melody electrical signal on top of the opposite-phase electrical signal; and a means for generating a melody electrical signal as a sound pressure. A vacuum cleaner with special features.