CN108200513A - A kind of nature circular horn formula paraphase structure mini speaker - Google Patents

Abstract

The present invention is a miniature sound box with a natural horn type inverted structure, which includes a box body, a speaker slot is arranged in the box, a speaker is installed in the speaker slot, and the front of the speaker faces the outside of the box body; the natural horn type inverted Structure The miniature speaker is equipped with a natural horn-type inverter tube inside. The natural horn-type inverter tube is a planar spiral hollow tube. The central end of the natural horn-type inverter tube leads to the outside of the box. The center of the tube is provided with a passive diaphragm; the other end of the natural horn type inverter tube communicates with the speaker groove. The structure of the invention can obtain very high sound quality on a miniature sound box, and achieve unexpected technical effects.

Description

A Natural French Horn Type Miniature Loudspeaker with Inverted Phase Structure

technical field

The invention relates to the field of sound technology, in particular to a miniature sound box with a natural horn type inverted structure.

Background technique

As we all know, the larger the sound unit, the larger the volume of the speaker, and the better the sound quality, but this conflicts with the current social trend of portability and mobility. Today, mobile phones are becoming thinner and lighter. Portable speakers with better sound quality, especially for the development of portable surround sound systems, the use of miniaturized sound units is the key to technical realization. In the interior of small speakers, it is necessary to fully consider the impact of materials, sound cavity structures, and manufacturing processes. Sound quality impact.

The front and back of the diaphragm of all speakers will generate sound waves, but their phases are opposite. If there is no partition, the output will be close to zero due to the cancellation of the front and rear pressures; the box is used to cut off the front and rear sound waves. The phase-inverted box is to flip the sound wave in one direction by 180 degrees in phase, so that it is in the same direction as the other way, and superimposed on each other to increase the sound pressure. Theoretically, the benefits brought by the inverter box include: 1. Increase the volume by up to five decibels. 2. Higher efficiency can improve low frequency response. 3. The lower cut-off frequency can be reduced by up to 30%. The inverter box can be made smaller under the condition of consistent performance. Generally speaking, the design of speakers is generally based on the EBP criterion, and its index is defined as: the ratio of the resonant frequency f of the speaker to the q value of the circuit part, that is, the resonant frequency of the speaker unit is the Q value of the circuit part of the speaker, and the unit of EBP for Hz. The EBP of the speaker unit can be designed as an inverter box or a closed box in the range of 50-100 Hz. If the EBP is greater than 100Hz, it should be designed as an inverted box, and if the EBP is less than 50Hz, it should be designed as a closed box.

In view of this, the present invention is proposed.

Contents of the invention

In order to solve the problem of poor sound quality of the miniature sound box, the present invention proposes a miniature sound box with a natural horn type inverted structure.

The French horn can vibrate the very small lips through the pressurization and amplification of the tube body to produce a large volume and beautiful tone. In the 17th century, the horn tube of the French natural horn circled twice. Thirty-one different signals are required, and specific horn calls can be used to describe the type, size, and even color of the animal seen. The simplest natural horn is to coil a slender conical horn tube (the tube length is generally between 2 and 5.5 meters) into 1 to 3 circles, and finally expand outwards into a large horn mouth. When playing, the lips are pressed against the relatively small funnel-shaped mouth, and the lips act as reeds, sending breath into the horn tube, making the air column in the horn tube vibrate and pronounce, in which the high-pitched area has rich overtones, and the timbre is unique. Loud, brilliant temperament.

Due to the need for portability, the volume of the speaker must be small. The volume of the generating unit is naturally small, and the amplitude must also be small. The small lip vibration can be transformed into a loud and beautiful tone through the French natural horn. Similarly, the sound with a small amplitude The unit cooperates with the inverted structure similar to the French natural horn to obtain better sound effects. Therefore, our R&D team was inspired by the French natural horn, and designed the inverted structure of the speaker as a spiral.

The present invention is achieved through the following technical solutions:

A miniature sound box with a natural horn type inverted structure, including a box body, a speaker slot is arranged in the box body, a speaker is installed in the speaker slot, and the front of the speaker faces outside the box body;

The natural horn type inverter structure miniature sound box is provided with a natural horn type inverter tube inside, and the natural horn type inverter tube is a plane spiral hollow tube, and the central end of the natural horn type inverter tube leads to the box body Outside, the center of the natural horn-type inverted tube is provided with a passive diaphragm; the other end of the natural horn-type inverted tube communicates with the speaker groove.

As a further improvement, the box body is made of wood blocks, and the natural horn type inverted tube is formed by plane spiral continuous holes machined inside the wood blocks.

As a further improvement, the natural horn type inverter tube is in the shape of a plane spiral with 2 turns.

As a further improvement, the natural horn-type inverted tube communicates with the speaker groove through a curved conduit.

Compared with the prior art, the present invention has the following advantages:

The invention adopts a unique natural horn-type inverted structure to make a miniature sound box. It can pressurize the sound in the speaker, elongate the inverter tube in a smaller volume, push the passive diaphragm at the lower end of the speaker, release the pressure, and form a process of vibration-inversion-pressurization-release. Using a small full-range speaker unit and adopting this creative structural design, the portable speaker can be further reduced in size while maintaining the sound quality. High sound quality has been obtained on the miniature sound box, and unexpected technical effects have been achieved.

Description of drawings

Fig. 1: side sectional view of embodiment 1;

Figure 2: A-A view of Figure 1.

In the figure: 1-cabinet; 2-speaker slot; 3-speaker; 4-natural horn type inverter tube; 5-passive diaphragm.

Detailed ways

The present invention will be further described below by way of examples, but the present invention is not limited to these examples.

Example 1

A natural horn type miniature sound box with inverted structure as shown in Fig. 1 and Fig. 2. It includes a box body 1, the box body 1 is made of wood, a speaker slot 2 is opened on the box body 1, a speaker 3 is installed in the speaker slot 2, and the front of the speaker 3 faces the outside of the body 1;

Described natural horn formula inverted structure micro-sound box inside is provided with natural horn formula inverted tube 4, and natural horn formula inverted tube 4 is formed by the coherent hole of the planar spiral shape (as shown in Figure 2) that is processed inside block As shown), the natural horn type inverter tube 4 is a planar spiral shape with 2 circles, and one end of the center of the natural horn type inverter tube 4 leads to the outside of the box body, and the center of the natural horn type inverter tube 4 is provided with Passive diaphragm 5; the other end of the natural horn type inverter tube 4 communicates with the speaker groove 2 through a curved conduit.

The size of the speaker unit has an absolute relationship with its lowest resonance frequency. The low-frequency performance of the small-size unit cannot be compared with the large-size unit. How to further reduce the size of the speaker without affecting the sound quality? The passive diaphragm The design can help to extend the low-frequency performance of small-sized monomers. Therefore, in this design, a passive diaphragm is installed at the opening of the spiral inverter tube at the lower end of the speaker to improve low-frequency performance. The team also creatively adopts a spiral phase-conducting structure similar to the French natural horn to pressurize the sound in the speaker, elongate the guide tube in a smaller volume, push the passive diaphragm at the lower end of the speaker, release the pressure, and form a vibration ——Phase inversion—pressurization—release process, using a small full-range speaker unit and adopting this creative structural design, the portable speaker can further reduce the volume while ensuring the sound quality. When a sine wave signal is input to the speaker, the positive half-period signal will be received first, and the diaphragm will move outward. This movement will expand the air in the airtight speaker, causing the pressure in the cavity to decrease, making the passive The radiator moves toward the inside of the speaker; when the sine wave signal changes to a negative half cycle, the diaphragm of the speaker moves inward, causing the air in the cavity to be compressed, causing the pressure in the cavity to rise, which will make the passive radiator move toward the outside of the speaker direction movement.

There are many resonance phenomena in nature, such as: the acoustic resonance of musical instruments, the orbital resonance between the satellites of some Jupiter-like planets in the solar system, the resonance of the basilar membrane in the ears of animals, and the resonance of electrical circuits. The resonance box in the stringed instrument, the electric resonance in the radio, etc., are to make the natural frequency of the system the same as the frequency of the driving force. The condition in which a physical system vibrates at specific frequencies with greater amplitudes than other frequencies; these specific frequencies are called resonant frequencies. At the resonant frequency, small periodic vibrations can produce large vibrations because of the kinetic energy stored in the system. When the resistance is small, the resonant frequency is approximately equal to the system's natural frequency, or natural frequency, which is the frequency at which it oscillates freely. Therefore, in terms of material selection, high-density solid wood is used to make the speaker shell. In addition to the round appearance and delicate feel, the greater the material density of the speaker shell, the smaller the resonance generated by the box when the sound is emitted, so that the sound can be more real. get restored. In this way, using a "wooden" material of sufficient thickness as the cabinet will have a better effect than other materials such as plastic, and the airtightness of the wood is also very good, so that the sound signal can be effectively expressed through the air vibration in the cabinet The finished good wood will be slightly deformed in its internal cavity with the years of use and the continuous friction of the sound in the air, becoming more suitable for the change of the sound, and the sound quality is more delicate. The density of wood is much higher than that of plastic, and wood can absorb resonance harmonics better than plastic, and there will not be too much noise.

The speaker of this embodiment invites 50 professionals to carry out subjective evaluation:

subjective timbre evaluation form

The test was tested in a closed recording studio environment without external interference, using the same playback equipment and the same sound test materials. The size of this miniature speaker is 70*35*20mm. The left and right sides of both ears are 25cm each, stereo sound test materials.

Among the 50 evaluation forms, the first 5 items are almost all excellent, only "fullness" has 2 evaluation forms as good indicators, and in the 50 evaluation forms for loudness, 42 indicators are excellent and 5 indicators are good. 3 servings are medium. Due to the limited volume, the power of the speaker is only 2W. Since the listener will have previous listening experience, it is inevitable to compare the loudness with the high-power speaker, so the loudness will feel "sometimes not enough". However, as a miniature speaker with a special phase-inverted structure, it can have such a timbre performance, which far exceeds the expectations of the testers. After the subjective sound evaluation of the system by 50 professionals, the sound quality of this speaker is better than that of speakers of the same size. Achieved unexpected technical effects.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (4)

1. a natural horn type inverted structure miniature sound box, comprising a casing, is characterized in that, a speaker groove is provided in the casing, a speaker is installed in the speaker groove, and the front of the speaker faces outside the casing; The natural horn type inverter structure miniature sound box is provided with a natural horn type inverter tube inside, and the natural horn type inverter tube is a plane spiral hollow tube, and the central end of the natural horn type inverter tube leads to the box body Outside, the center of the natural horn-type inverted tube is provided with a passive diaphragm; the other end of the natural horn-type inverted tube communicates with the speaker groove. 2. a kind of natural horn type inverted structure miniature sound box as claimed in claim 1, is characterized in that, described box body is made of wooden block, and described natural horn type inverted tube is processed inside wooden block Formed by continuous holes in the shape of a plane spiral. 3. a kind of natural horn type inverted structure miniature sound box as claimed in claim 1, is characterized in that, described natural horn type inverted tube is the plane spiral shape of 2 turns. 4. A natural horn type inverted structure miniature sound box as claimed in claim 1, characterized in that, said natural horn type inverted tube communicates with the speaker groove through a curved conduit.