CN111629311A

CN111629311A - Novel moving-coil loudspeaker and manufacturing method

Info

Publication number: CN111629311A
Application number: CN202010277069.4A
Authority: CN
Inventors: 陈宁
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-04-07
Filing date: 2020-04-07
Publication date: 2020-09-04

Abstract

The invention is a new moving coil loudspeaker and its preparation method, it is on the basis of keeping the advantage of the traditional moving coil loudspeaker, through the transformation to the conventional vibration basin, have increased the sound wave that the flexible vibration produces, make the original loudspeaker become closer to the natural sound by the sound wave that the single piston type movement emits, thus improve the fidelity performance of the loudspeaker.

Description

Novel moving-coil loudspeaker and manufacturing method

Technical Field

The invention relates to a moving-coil loudspeaker, in particular to a novel moving-coil loudspeaker with a cone-shaped cavity cone and a manufacturing method thereof.

Background

The driven coil type loudspeaker is the mainstream form of the loudspeaker since the advent of the driven coil type loudspeaker, and the loudspeaker has a simple structure and is used until now due to mature technology. It is mainly composed of magnet, voice coil, cone-shaped vibration box, centering piece and elastic folding edge. The working principle is as follows: when audio current flows through the voice coil in the magnetic field, a corresponding magnetic field is generated along with the flowing of the audio current, and due to the interaction of the new magnetic field and the original magnetic field, rigid piston type reciprocating vibration is generated between the voice coil supported by the centering sheet, the elastic folding edge and other parts in a resultant force manner and the conical paper box tightly connected with the voice coil, so that surrounding air is driven to generate sound waves. In this rigid piston type vibration, the loudspeaker cone does not deform in theory. The sound wave generated in this way changes in amplitude and frequency during propagation. However, the natural real sound wave is not only generated by rigid piston type vibration, but also sound waves generated by the object through the flexible vibration generated by elastic deformation. In the process of propagation of the sound wave, the sound wave moves in parallel, and the amplitude and the frequency of the sound wave are not changed theoretically. Compared with the sound wave generated by a loudspeaker in a single piston type vibration mode, the natural real sound wave is a multi-phase and multi-point composite sound wave. However, since the conventional reproduction systems are designed based on the reproduction characteristics of the speaker in which the piston moves, there is a lack of sound wave components emitted by the flexible vibration of the object during reproduction, and there is still a lack of acoustic fidelity and room for improvement.

Disclosure of Invention

In view of the above-mentioned disadvantages of the moving-coil speaker, the present invention is improved by the following technical measures:

the conventional moving coil loudspeaker has the outstanding advantages of being excellent in low-frequency performance and low in cost, and the conventional moving coil loudspeaker is mature in technology from the aspect of frequency response, and no better technology is available for replacing the conventional moving coil loudspeaker.

The invention keeps the basic structure, uses the sound production principle, but modifies the cone-shaped vibration basin, and adds a thin plane vibration film with hollow tooth-shaped pattern hole in the center at the combination part of the top end of the opening of the cone-shaped vibration basin and the elastic folded edge, as shown in figure 1. The planar diaphragm, in addition to adopting a special physical shape, is made of a material having sufficient strength, high elasticity, fatigue resistance and a specific gravity as small as possible, and may be selected from a metal such as titanium. It can also be non-metal and other high molecular material, such as resin carbon fiber composite board. The size of the plane vibrating diaphragm is equal to the aperture of the opening of the conical vibrating basin on the loudspeaker, and the plane vibrating diaphragm is tightly adhered to the joint part of the elastic folded edge of the loudspeaker and the conical vibrating basin by proper glue, so that the original vibrating basin is changed into a conical cavity structure semi-closed by the bottom surface with the hole from a conical plane opening structure.

When the loudspeaker plays sound, along with the reciprocating motion of the cone, part of energy is transmitted to the plane diaphragm from the cone wall, and the tooth-shaped part of the plane diaphragm is elastically deformed to generate flexible vibration. The sound wave emitted by the improved loudspeaker in the sound reproduction process is not only the sound wave generated by the reciprocating motion of the cone-shaped basin piston, but also the sound wave component generated by the flexible vibration of the plane diaphragm is increased, so that the sound wave emitted by the loudspeaker in the working process is closer to natural sound. Although the whole diaphragm system is added with a plane diaphragm, so that the mass is increased, and the sensitivity of the loudspeaker is affected, the current amplifier technology and the prior amplifier technology have great leaps, and the power can be easily improved, so that the sensitivity is not an important problem. In addition, because the plane diaphragm and the cone-shaped vibration basin actually form a cavity, sound waves generated by the flexible vibration of the plane diaphragm can be enhanced due to the resonance of the cavity. Experiments show that compared with the traditional loudspeaker, the novel loudspeaker emits sound with wide listening sound field and closer to natural sound.

Drawings

Fig. 1 is a schematic plan view of a planar diaphragm. The composite board is a circular flat board, the center of the flat board is provided with hollow tooth-shaped pattern holes, the selected material is a substance with high strength, high elasticity and light weight, and the selected material can be metal or nonmetal, and a titanium film and a resin carbon fiber composite board with proper thickness are preferred. Because the sound wave generated by the flexible vibration is generated by the elastic deformation of the tooth-shaped part of the plane diaphragm, the change of the shape of the tooth-shaped part can cause the difference of the sound production effect, so that the hollowed tooth-shaped pattern hole corresponding to the conical cones with different specifications, the plane diaphragms with different materials, thicknesses and different sizes in the production can be manufactured according to the principle schematic diagram of the plane diaphragm in the attached figure 1, and the optimal shape can be determined through experiments according to the principle of the hollowed tooth-shaped pattern hole.

Fig. 2 is a schematic cross-sectional diagram of the present invention, divided into 8 parts: 1. the loudspeaker comprises a loudspeaker frame 2, an elastic folded edge 3, a plane vibrating diaphragm 4, a conical vibrating cone 5, T-shaped iron 6, permanent magnets 7, a voice coil centering sheet 8 and a voice coil. Compared with the standard structure of the traditional loudspeaker, the flat diaphragm 3 is mainly and newly added. The plane diaphragm is positioned at the joint of the cone-shaped basin and the elastic folded edge, and the cone-shaped basin and the elastic folded edge are combined to form a semi-closed cone-shaped cavity. In order to simplify the manufacturing process, after the appropriate planar diaphragm is made of the appropriate material, the planar diaphragm is adhered to the joint part of the cone-shaped basin and the elastic folded edge of the existing corresponding loudspeaker by using high-strength glue, so that the conical cavity is manufactured, the area of the planar diaphragm at the cone bottom of the conical cavity is maximized, the volume of the conical cavity is maximized, and the sound production effect of sound waves generated by flexible vibration is improved.

Detailed Description

The invention will now be further described with reference to the following examples

The first embodiment is as follows: 3 cun novel speaker bandwidth: 150HZ- - -18kHZ

Power 5W

The first step is as follows: due to the limitation of physical conditions, the small-caliber loudspeaker is not a strong term in low frequency, and the playback effect of medium-high frequency characteristics is considered. A titanium alloy film with the thickness of 0.1mm is selected and is etched into a plane vibrating diaphragm with a hollow tooth-shaped pattern hole, the outer diameter of which is 7cm and the central opening of which is 12 teeth as shown in figure 1, by laser.

The second step is that: the conventional full-frequency moving coil loudspeaker with the power of 8W, the bandwidth of 130HZ to 19KHZ and the caliber of 3 inches is designed and manufactured, and the caliber of the conical aluminum-magnesium alloy cone is 7 cm.

The third step: the titanium alloy diaphragm is firmly adhered to the joint of the conical basin and the elastic folded edge by high-strength glue to form a semi-closed conical cavity.

The fourth step: the parameters of the loudspeaker tested by the instrument are as follows: the rated power is 8W, the frequency response is 130HZ to 19KHZ +/-3 db, the design requirements are met, and the manufacturing is finished.

Example two: 6.5 inch new speaker bandwidth: 60HZ- - -18kHZ

Power 35W

The first step is as follows: selecting a resin carbon fiber composite board with the thickness of 0.15mm, and engraving a plane diaphragm which is shown in figure 1 and has a central hole with the outer diameter of 12cm and 12 teeth and is provided with a hollowed tooth-shaped pattern hole by laser. The second step is that: the conventional full-frequency moving coil loudspeaker with 35W power, 60 HZ-19 KHZ bandwidth and 6.5 inches caliber is designed and manufactured, and the caliber of a cone is 12 cm.

The third step: and firmly adhering the vibrating diaphragm to the joint of the conical basin and the elastic folded edge by using high-strength glue to form a semi-closed conical cavity.

The fourth step: the parameters of the loudspeaker are tested to be 35W of rated power and 50HZ to 19KHZ +/-3 db of frequency response through an instrument, the design requirements are met, and the manufacturing is finished.

The invention keeps the advantages of the traditional moving coil loudspeaker and increases sound waves generated by flexible vibration, and the actual listening feeling proves that compared with the similar loudspeaker which is not improved, the improved loudspeaker increases the feeling of being personally on the scene no matter the sound is human or the sound is orchestral, and has low manufacturing cost and convenient popularization and production.

Claims

1. A novel moving-coil loudspeaker comprises a loudspeaker cone frame, a conical cavity, a permanent magnet, a centering sheet, an elastic folded edge, a voice coil and T-shaped iron, and is characterized in that the conical cavity is a semi-closed cavity formed by combining a conventional loudspeaker conical vibration cone, an elastic folded edge combining part and a plane vibration diaphragm.

2. The flat diaphragm of claim 1, which is made of a light high-strength high-elasticity material, has the same size and shape as the cone of a conventional loudspeaker, and is a metal or nonmetal sheet with a hollow tooth-shaped pattern hole in the center, and is preferably made of a titanium and resin carbon fiber composite board.