JPH02503257A - Non-resonant acoustic transducer/radiator system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Non-resonant acoustic transducer/radiator system Background of the invention The present invention relates to acoustic transducer/radiator systems, and more particularly to acoustic transducer/radiator systems. , specifically designed to eliminate resonance problems in the acoustic transducer/radiator system described above. This refers to an improved cabinet that has been designed.

The acoustic transducer/radiator system described above, commonly referred to as an acoustic box, transmits sound waves. A sound device used for playback. Furthermore, the above acoustic transducer/radiator system A stem usually has one or more speakers mounted in one cabinet. The above cabinet is designed to increase the efficiency of the above speakers. There is.

The above acoustic transducer/radiator system, hereinafter referred to as an acoustic box, is a A speaker for low frequency reproduction called a har, and a speaker for intermediate frequency reproduction called a mid range. It is equipped with a speaker for live use and a speaker for high frequency reproduction called a tweeter. Ru. Here, the above-mentioned speaker for low frequency reproduction is a musical instrument such as a large drum or bassoon. This is for reproducing the bass generated by the above-mentioned intermediate frequency reproduction speaker. The speaker is an interlayer sound wave such as the human voice or the sound produced by most musical instruments. The above-mentioned high frequency reproduction speakers are designed to reproduce It reproduces the high-pitched sounds produced by Una musical instruments.

Furthermore, in multiple acoustic boxes that use two or more types of combined speakers, is when high-frequency sounds are played by low-frequency speakers and vice versa. This ensures that any speaker only reproduces frequencies within the range for which it was originally designed. A frequency crossover is required to monitor the above frequencies so that The key point.

As is well known to those skilled in the art, a speaker cone vibrates in response to an electrical signal. When it moves, sound is radiated to both sides of this cone. That is, the forward movement of the cone As a result, the pressure at the front of the cone increases and the air at the back becomes thinner. Become. On the other hand, the opposite situation occurs due to backward movement of the cone. this If their forward and backward movements are repeated continuously, the phases will be 180° to each other. Two offset and contradictory sound waves are generated. These two sound waves cancel each other out This problem of cancellation becomes more serious as the frequency decreases. come.

The solution to this problem is to use a plate called a baffle to attach the speaker. The purpose is to completely separate the front and back surfaces of the cone. The above front and back are completely The ideal dimensions of the baffle above must be infinite in order to separate . However, it is practically impossible to prepare this infinitely large baffle, so acoustics experts were forced to come up with another strategy to solve the above problem.

Thus, the first solution proposed to the above problem is a completely sealed acoustic The use of a box results in completely separating the front and rear sides of the speaker. The aim is to reproduce a baffle with infinitely large dimensions. this The basic principle of such a concept is called a closed system.

According to the above concept, all the energy radiated from the back of the speaker is transferred to the cavity. The inside of the above cabinet is made of glass so that it is absorbed in the net and dissipated as heat. It is covered with a sound-absorbing material such as wool without any gaps.

It is true that the above-mentioned sealed system has low overtone distortion and small dimensions. It is possible to manufacture an acoustic box that has good response to low frequencies even when the noise is low. death However, the closed system described above nevertheless requires the use of high-quality speakers. With this requirement, the structure of the acoustic box has inevitably changed. Because it needs to be precise, the manufacturing cost of this acoustic box will increase. A major drawback arises.

The second solution proposed to the above sound cancellation problem is that sound cancellation is Or a duct-shaped back box with an exit, also called a nokusureflex. be. This duct-shaped acoustic box only has a small opening called a duct. It consists of a nearly sealed hollow cavity with a

In an acoustic box manufactured based on the basic principle of the above concept, the resonant frequency The cavities are designed so that the acoustic characteristics vary linearly without peaks in the number. The resonant frequency of both the net and the speakers installed in this cabinet. It is necessary to synchronize. This tuning effect improves the performance of the acoustic box. It becomes a good thing. However, when the air inside the duct matches the phase of the speaker It is difficult to tune the resonant frequencies of both of the above so that they move inward and outward. stomach.

One solution that has been proposed to enable the above synchronization effect is to create several apertures or or by using a duct to prevent the above resonance frequency from concentrating in one place. Is Rukoto. Additionally, the phases of the sound waves from the front and back of the speaker are aligned with each other. Another proposed solution is to create a maze within the acoustic box. using several baffles. However, the dimensions of these baffles are This will vary depending on the type of speaker used in the acoustic box, so the above As a result, the problem of high manufacturing costs also arises in the formulation.

The object of the present invention is to solve the above-mentioned conventional problems and to provide the following acoustic transducer/radiator system. The aim is to provide In other words, the above conventional problems can be easily and reliably solved. solution and adds a cost factor to the manufacturing of the acoustic box. It is a system that will not be used.

According to the invention, the above object is achieved by an acoustic transducer/ This is achieved by providing a radiator system. That is, in particular, Installed with multiple speakers set to play sound with a frequency of each side wall of this cabinet is It has at least one diagonally open groove cut into the wall.

Additionally, the accompanying drawings, which are perspective views from above, of the acoustic box of the present invention show: Examples will be described in more detail as representative examples of the present invention.

According to the above attached drawings, a non-resonant acoustic transducer/radiator system, i.e. an acoustic The box basically consists of a cabinet having side walls 2, top walls 3 and bottom walls 4. 1, and multiple speakers 5.6 and 7 attached to this cabinet 1. It is equipped with Furthermore, an oblique opening groove 8 is cut into the side wall 2. .

The cabinet 1 is made from laminated wood or plywood and is approximately 19 It is one housing having a thickness of m+n. Furthermore, this housing has four side walls 2 and has an approximately rectangular cross section formed by the top and bottom walls 3.4 . Further, the side wall 2, the top wall 3, and the bottom wall 4 have a portion other than the diagonal opening 8. They are interconnected to form a nearly closed cabinet.

Furthermore, as can be clearly seen from the above attached drawings, each corner of the acoustic box of the present invention There are feet or supports to hold the acoustic box at a slightly higher position than the floor. A holding portion 9 is provided. In addition, the woofer for reproducing bass with low frequencies is The cones of each of the speakers 5 on the top are facing each other back to back. It is attached to the upper and lower walls 3.4 of the sound box.

By arranging the woofer speaker 5 as described above, the woofer speaker 5 The resonances arising from the engine 5 are partially canceled out. This partial cancellation causes the acoustic box to This is the first step to eliminate resonance within the bus.

Furthermore, the speakers 6.7 of midranges and tweeters are usually equipped with acoustic boxes. It is attached to the side wall 2 of the space.

In addition, the installation and/or fixing of the speaker 6.7 and Connections are well known to those skilled in the art, so detailed explanations will not be given hereafter. do.

The resonance hearing in the acoustic box of the present invention is diagonal to the side wall 2 of the cabinet 1. This can be completely eliminated by cutting the opening groove 8.

These opening grooves 8 have an inclination angle in the range of 30° to 70° from the horizontal plane. Numerous ducts to form sound holes or exits within the enclosure. It operates as a system with In other words, the various resonant frequencies within the cabinet Each of the wave numbers finds a respective corresponding exit at a predetermined point of the aperture groove 8. I will do it. Therefore, each of the above resonance frequencies is the same as this resonance frequency. Due to the presence of a unique exit opening, the It never happens. As a result, the problem of concentration of resonant frequencies is solved.

In addition, conventional closed systems or duct systems with sound holes or outlets Unlike the above-mentioned opening groove 8, the correction band translation submission form (Article 184-7, Paragraph 1 of the Patent Act) October 11, 1999 Yoshi, Commissioner of the Patent Office 1) Takeshi Moon 1 Display of patent application PCT/BR89100001 , name of invention Non-resonant acoustic transducer/radiator system 3 Patent applicant Residence: Apete, São Paulo Esibi, Brazil.

23. Rua Maria Figueiredo 648 Name Mazuza, George 4 agents Scope of request for amendment to engraving (no changes in content) [At the International Bureau, July 26, 1989 Accepted (’89.07.26).

Claims 1 and 8 as filed have been amended; other claims are one page without any changes. )] 1, specifically designed to reproduce sounds, each with a different frequency. It is equipped with a cabinet in which various types of speakers are installed. Each side wall (2) of the cabinet (1) has an asymmetrical cut in it. a non-common type, characterized in that it has at least one oblique opening groove (8) inserted therein; Vibratory, non-tuned acoustic transducer/radiator system.

2. The angle of inclination of the diagonal opening groove (8) is in the range of 30° to 70° from the horizontal plane. The non-resonant, non-tuned acoustic transducer/radiator system according to claim 1, which satisfies the following: .

3. The inclination angle of the diagonal opening groove (8) is from 35° to 65° from the horizontal plane. The non-resonant, non-tuned acoustic transducer/radiator system according to claim 2, which falls within the range Tem.

4. The angle of inclination of the oblique opening groove (8) is 55° from the horizontal plane. Non-resonant, non-tuned acoustic transducer/radiator system.

5. The width of the diagonal opening groove (8) is at least the same as that of the speakers (5, 6 and 7). ) is wide enough to be able to vibrate freely. , a non-tuned acoustic transducer/radiator system.

6. The various types of said speakers (5, 6 and 7) reproduce lower frequency sounds. 2. A non-shared speaker according to claim 1, further comprising at least one loudspeaker (5) for Vibroform, tunable acoustic transducer/radiator system.

7. The speaker (5) for reproducing lower frequency sounds is installed in the cabinet. 7. The top wall (3) and the bottom wall (4) of the top wall (1) of the top wall (1). non-resonant, tuned acoustic transducer/radiator system.

8. The cabinet (1) has two speakers for reproducing lower frequency sounds. a speaker (5), the speaker (5) is connected to the top wall (3) and the bottom wall. (4) The non-resonant, non-tuned acoustic transducer/radiator according to claim 1, which is attached to the gun system.

Procedure correction band (method) %formula% 1.Display of the incident PCT/BR89100001 , name of invention Non-resonant acoustic transducer/radiator system 3. Person who makes corrections Relationship to the incident Patent applicant Name Mazuza, George 4. Agent Address: 8-10-6 Toranomon-chome, Minato-ku, Tokyo 105, subject to amendment 7. Contents of correction Translation of the specification and claims (no changes to the content) 8. List of attached documents Translation of description and scope of claims 1 each Correspondence amendment band (method) July 1990 Yu O Day Commissioner of the Patent Office Toshi Ue Matsu 1. Display of incident PCT/BR8910OOOO1 , name of invention Non-resonant acoustic transducer/radiator system 3. Person who makes corrections Relationship to the incident Patent applicant Name Mazuza, George 4. Agent Address: No. 5, Toranomon-chome 8-chome, Minato-ku, Tokyo 105, Date of amendment order International search report.

Claims (7)

[Claims] 1. In particular, a variety of The type of speaker installed in the cabinet is Each side wall (2) of the net (1) has at least one hole cut into said side wall (2). A non-resonant acoustic transducer characterized in that both have one oblique opening groove (8). /Radiator system. 2. The angle of inclination of the diagonal opening groove (8) ranges from 30° to 70° from the horizontal plane. 2. The non-resonant acoustic transducer/radiator system of claim 1, wherein the non-resonant acoustic transducer/radiator system is within the range of . 3. The inclination angle of the diagonal opening groove (8) is from 35° to 65° from the horizontal plane. 3. The non-resonant acoustic transducer/radiator system of claim 2, wherein: 4. The non-resonant type according to claim 3, wherein the inclination angle of the oblique opening groove (8) is 55°. Acoustic transducer/radiator system. 5. The width of the diagonal opening groove (8) is at least the same as that of the speakers (5, 6 and 7). ) is wide enough to be able to vibrate freely. Acoustic transducer/radiator system. 6. The various types of said speakers (5, 6 and 7) reproduce lower frequency sounds. 2. A non-shared speaker according to claim 1, further comprising at least one loudspeaker (5) for Vibroacoustic transducer/radiator system. 7. The speaker (5) for reproducing lower frequency sounds is installed in the cabinet. 7. The top wall (3) and the bottom wall (4) of the top wall (1) of the top wall (1). non-resonant acoustic transducer/radiator system.