JPH0525893U - Speaker system - Google Patents

Abstract

(57) [Summary] [Purpose] Oil and ash dust that adhere to the vibrating surface of a silence speaker can be easily removed, and the performance of the silence speaker can be maintained for a long period of time. [Configuration] A protective filter 10 is provided on the front surface of the sound emitting surface of the silencer speaker 4. Replace the protection filter regularly,
By cleaning, it becomes possible to maintain the performance of the vibrating surface for a long time.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 INDUSTRIAL APPLICABILITY The present invention is used for an electronic silencing system that radiates a sound wave of opposite phase having the same sound pressure as that of the sound wave in a duct propagating the sound wave, and mutes the sound wave and noise by mutual interference. The present invention relates to a speaker system.

[0002]

[Prior Art]

 FIG. 5 is a principle diagram of a conventional electronic muffling system for a pipeline disclosed in, for example, Japanese Utility Model Publication No. 2-83599. In the figure, 1 is an air-conditioning duct that serves as a sound wave propagation path. In this air-conditioning duct 1, a first microphone 2 and a second microphone 3 for noise reduction evaluation are arranged downstream thereof. There is. Further, a silence speaker 4 is installed between the first microphone 2 and the second microphone 3, and a control device 5 is installed between the silence speaker 4 and the second microphone 3. There is. Reference numeral 6 is a speaker cabinet for the silence speaker 4.

The conventional electronic silencing system is configured as described above, and the propagating sound wave from the noise source is detected by the first microphone 2, converted into an electric signal and input to the control device 5. The signal detected by the second microphone 3 installed downstream of the first microphone 2 is also input to the control device 5 in the same manner. In the control device 5, at the installation position of the second microphone 3, a driving signal that causes the output of the second microphone to become zero due to the interference between the sound wave for noise elimination emitted from the noise reduction speaker 4 and the sound wave propagated from the noise source. Is generated and output to the muffling speaker 4 so that the sound wave emitted from the noise source can be eliminated at the installation position of the second microphone 3.

[0004]

[Problems to be solved by the device]

 Since the conventional electronic silencing system is configured as described above, the vibrating surface of the silencing speaker must be directly exposed inside the duct, and the propagating acoustic wave passing through the duct is accompanied by oil smoke and soot smoke. In this case, it is difficult for the muffling speaker to maintain the desired performance for a long period of time, for example, because the deposits on the vibrating surface of the muffling speaker hinder the vibration and the rigidity of the vibrating surface decreases due to the chemical reaction. There was a problem that there was.

The present invention has been made to solve such a problem, and oil and ash dust adhering to the vibrating surface of a muffler speaker can be easily removed, and the performance of the muffler speaker can be maintained for a long period of time. An object is to provide a speaker system.

[0006]

[Means for Solving the Problems]

 The speaker system according to the present invention is a direct emission type speaker unit which is a means for generating an antiphase sound wave, and is provided with a removable net filter in front of the vibrating surface of the direct emission type speaker unit. is there. .

Further, instead of the net-shaped filter, punching metal is used to improve heat resistance.

Furthermore, in a speaker system including a plurality of direct-radiation speaker units, a filter is provided that simultaneously covers the front surfaces of the sound emission surfaces of at least two direct-radiation speaker units.

[0009]

[Action]

 The speaker system according to the present invention is provided with a net-like filter which has low acoustic resistance and is detachable in front of the vibrating surface, so that when the speaker system is used as a muffling speaker of an electronic muffling system, the inside of the duct is Since the oil and ash dust contained in the passing oil smoke and soot smoke are filtered by the filter, it is possible to prevent the sound deadening speaker from adhering to or accumulating on the vibrating surface. Also, by periodically replacing the filter, it is possible to prevent the filter from being clogged.

Further, heat resistance can be improved by forming the net-shaped filter provided on the front surface of the speaker system with punching metal. Also, by regularly cleaning the filter, it is possible to prevent clogging of the filter.

Furthermore, if a plurality of direct radiation type speaker units are simultaneously covered with one filter, the detaching work becomes simple.

[0012]

【Example】

 Example 1. FIG. 1 is a perspective view showing a speaker system according to an embodiment of the present invention. In the figure, 4 is a direct emission type speaker unit that radiates anti-phase sound waves in the duct. A muffling speaker, 6 is a speaker cabinet to which the muffling speaker 4 is attached, 10 is a protective filter, 11 is for attaching and detaching the protective filter 10. It is a fixing means such as a magic tape. FIG. 2 shows a system configuration diagram when the speaker system of the present invention is incorporated into an electronic muffling system as a muffling speaker.

In the speaker system configured as described above, the protection filter 10 is provided in front of the vibrating surface of the sound deadening speaker 4, so that the smoke and soot that pass through the inside of the duct 1 of the electronic sound deadening system can be prevented. The contained oil and ash dust are filtered by the protective filter 10, and it is possible to prevent the oil and ash dust from adhering to and deposit on the vibrating surface of the muffler speaker 4, and to maintain the performance of the muffler speaker for a long time. Further, the protection filter 10 can be prevented from being clogged by regularly replacing the protection filter 10. Further, even if the protective filter 10 is made of punching metal having high heat resistance, the same effect can be obtained.

Embodiment 2 FIG. 3 is a perspective view showing that the radiating means for anti-phase sound waves is composed of a plurality of direct radiating speaker units. 9a is a first muffling speaker and 9b is a second muffling speaker. It is a silencer speaker. FIG. 4 shows a system configuration diagram when the speaker system of the second embodiment is incorporated into an electronic muffling system as a muffling speaker.

In the second embodiment shown in FIG. 3, since the first muffling speaker 9a and the second muffling speaker 9b are covered with one protection filter 10, the replacement work of the protection filter 10 is simplified. You can do it.

[0016]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects.

In the speaker system according to the present invention, a net-like filter that has less acoustic resistance and is removable is provided on the front surface of the vibrating surface of the direct radiation type speaker unit. When used as a muffler speaker, oil and ash dust contained in oil and soot that passes through the duct are filtered by the filter, preventing oil and ash dust from adhering to and depositing on the vibrating surface of the muffler speaker. It is possible to maintain the performance of the vibrating surface for a long time. Also, by regularly replacing the filter, it is possible to prevent clogging of the filter.

Further, heat resistance can be improved by forming the net-shaped filter provided on the front surface of the speaker system with punching metal. Also, by regularly cleaning the filter, it is possible to prevent clogging of the filter.

Further, if a plurality of direct radiation type speaker units are simultaneously covered with one filter, the attachment / detachment work becomes simple.

[Brief description of drawings]

FIG. 1 is a perspective view showing a speaker system according to an embodiment of the present invention.

FIG. 2 is a block diagram of an electronic silencing system incorporating FIG.

FIG. 3 is a perspective view showing a speaker system according to another embodiment of the present invention.

FIG. 4 is a configuration diagram of an electronic silencing system incorporating FIG.

FIG. 5 is a sectional view showing a conventional electronic silencing system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air-conditioning duct 2 1st microphone 3 2nd microphone 4 Silent speaker 5 Control device 6 Speaker cabinet 9a 1st silencing speaker 9b 2nd silencing speaker 10 Protection filter 11 Fixing means

Claims (3)

[Scope of utility model registration request] 1. An electronic device that generates a sound wave having the same sound pressure and a phase opposite to that of a sound wave propagating from a noise source in a sound wave propagating path, and muffs the sound wave interference at a predetermined position in the propagating path. A speaker system characterized in that, in the sound deadening system, a removable net-shaped filter having a small acoustic resistance is provided on the front surface of the vibrating surface of the direct radiation type speaker unit which is the means for generating the anti-phase sound wave. 2. The speaker system according to claim 1, wherein a punching metal having high heat resistance is used as the net-shaped filter according to claim 1. 3. In the one in which the means for generating the anti-phase sound wave has a plurality of direct emission type speaker units, a filter is provided to cover at least two direct emission type speaker units in front of the acoustic emission surface at the same time. The speaker system according to claim 1, wherein the speaker system is a speaker system.