CN108064010B

CN108064010B - Belt loudspeaker diaphragm that non-uniform width was cut apart

Info

Publication number: CN108064010B
Application number: CN201711382775.XA
Authority: CN
Inventors: 何永斌
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-12-20
Filing date: 2017-12-20
Publication date: 2020-10-09
Anticipated expiration: 2037-12-20
Also published as: CN108064010A

Abstract

The invention discloses a non-equal-width-divided belt type loudspeaker diaphragm, which is positioned at the center of a magnetic gap of a loudspeaker, wherein the diaphragm consists of N parallel subdivided lead foils, and the subdivided lead foils are connected in series or in series-parallel through an external circuit, so that after current is switched in, the subdivided lead foils have synchronous acceleration in the width direction of the magnetic gap when vibrating. The vibrating diaphragm is composed of N parallel subdivided conducting wire foils, and has the same acceleration in the width direction of the magnetic gap by connecting an external circuit, so that the distortion problem caused by deformation of the vibrating diaphragm due to nonuniform electromagnetic force stress in the width direction caused by nonuniform magnetic induction strength in the magnetic gap can be avoided.

Description

Belt loudspeaker diaphragm that non-uniform width was cut apart

Technical Field

The invention relates to a belt loudspeaker of one of electric loudspeakers in sound equipment, belongs to the technical field of electroacoustic, and particularly relates to a belt loudspeaker diaphragm with unequal width division.

Background

The famous semiconductor scientists Walter Schottky and Siemens Halske invented the ribbon tweeter in 1923, and the application is not wide at that time because a magnet with strong magnetism cannot be found, the impedance and the bearing power of a diaphragm are small, and the efficiency is low. Later, people utilized aluminum diaphragms and made magnetic circuits of materials with strong magnetism to match with vibration systems, so that good efficiency and sound quality were obtained, and the ribbon tweeters began to be gradually popularized in application of high-end speaker systems.

Conventional ribbon loudspeaker diaphragms have several forms:

pure aluminum vibrating diaphragm: as CN 98246922: the diaphragm is made of a single piece of aluminum foil, which has a very low impedance and requires a transformer for impedance transformation in connection with the power amplifier. The diaphragm is easily impacted or torn due to metal fatigue due to stress concentration; the diaphragm is also pressed into a wavy shape to reinforce the strength in the width direction, and the synchronous movement of the diaphragm in the width direction is initially ensured, but the aluminum band is often distorted and generates strong metal sound at a specific frequency due to various imbalance factors. In addition, the diaphragm keeps certain tension through the contraction of the wave-shaped embossing of the diaphragm, but because the rebound resilience of aluminum is poor, permanent deformation is easy to occur due to impact, and the positioning precision of an aluminum strip in a magnetic circuit is not high.

Compound vibrating diaphragm: for example, CN200420023548, the combination of conductive metal foil and organic film can significantly enhance the strength of the diaphragm and increase the internal damping thereof, but still requires an impedance matching transformer.

Composite printed diaphragms, as disclosed in CN201310300212, are manufactured by etching processes on aluminum foil with an organic thin film as a base material to have a specific impedance, and such diaphragms can be directly driven by a conventional power amplifier, and do not require a transformer for impedance matching. This kind of diaphragm performance has been comparatively comprehensive, and only for pure aluminium vibrating diaphragm, the composite bed has increased the quality of vibrating diaphragm, and efficiency slightly reduces, and the substrate of making this kind of vibrating diaphragm often stores up certain stress at the compound production process in addition, and the inhomogeneous also can lead to the diaphragm to warp of stress, and the planarization of sound membrane still has the improvement space, and the stress uniformity of diaphragm is especially important to the level and smooth of making large-scale aluminium strip high pitch such as the aluminium strip high pitch vibrating diaphragm that length reaches 1 meter.

The sound membrane has better self-damping, but the production difficulty is higher compared with the above type of vibration membranes, because a precise weaving machine is needed to ensure the dimensional precision and the uniformity of the sound membrane after weaving because of weaving fine woven wires, the operation difficulty is high, and the cost is higher.

Therefore, the use quality of the existing diaphragm is influenced by the problems of diaphragm deformation and distortion caused by ampere force due to uneven magnetic induction intensity in the magnetic gap.

Disclosure of Invention

The invention aims to provide a non-equal-width-divided band-type loudspeaker diaphragm, which consists of N parallel subdivided lead foils, and the diaphragm has the same acceleration in the width direction of a magnetic gap by connecting an external circuit, so that the distortion problem caused by deformation of the diaphragm due to nonuniform electromagnetic force stress in the width direction caused by nonuniform magnetic induction strength in the magnetic gap is avoided.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides a non-equal-width-divided belt type loudspeaker diaphragm which is positioned at the center of a magnetic gap of a loudspeaker, wherein the diaphragm consists of N parallel subdivided lead foils, and the subdivided lead foils are connected in series or in series-parallel through an external circuit, so that after current is switched in, the subdivided lead foils have synchronous acceleration in the width direction of the magnetic gap when vibrating.

Assuming that the width of each sub-divided wire foil is W1 and W2 … Wn, the currents flowing through the sub-divided wire foils are I1, I2, … and In respectively. According to

Obtaining:

（1）

the average magnetic induction at the location of the subdivided conductor foils,

the mass of the diaphragm per unit width is responsible for the driving (including the mass of the wire foil per unit width and the air added mass in the corresponding driving area).

From the formula (1), it can be known that the width of each sub-divided lead foil or the current magnitude of each sub-divided lead foil (which can be realized by adjusting the magnitude of each current by an external current distribution circuit) is adjusted or adjusted cooperatively, so that the vibrating diaphragm can be synchronously vibrated in the width direction immediately by the formula.

Modifying the above formula (1) to obtain:

（2）

preferably, the subdivided wire foils are connected in series to equalize the current, and the quality of the diaphragm is controlled to be uniform, that is to say

And (3) obtaining the following products:

（3）

according to the formula (3), the width of each subdivided conducting wire foil is controlled to be in direct proportion to the average magnetic induction intensity of the position of the magnetic gap, and the acceleration of each part of the vibrating diaphragm in the width direction of the magnetic gap can be controlled to be consistent, so that the vibrating diaphragm synchronously vibrates in the magnetic gap.

In the present invention, it is preferable that the respective sub-divided conductor foils are connected in series via an external circuit, the sub-divided conductor foils have uniform mass, and the width of each sub-divided conductor foil is in direct proportion to the average magnetic induction intensity at the position.

In order to avoid the impedance of the diaphragm in the magnetic gap from being too high due to excessive subdivided lead foils, the number N of the subdivided lead foils is even, and the N subdivided lead foils form two groups of subdivided lead foils symmetrically distributed in the magnetic gap from the center line of the width of the magnetic gap, the subdivided lead foils in the two groups of subdivided lead foils are connected in series, and the two groups of subdivided lead foils are connected in parallel, so that the impedance can be reduced by half.

Preferably, the subdivided conductive foil has a square or polygonal cross section.

Preferably, one or both sides of the diaphragm are compounded with organic films to connect the subdivided conducting wire foils into a whole.

The invention has the beneficial effects that: the invention utilizes the direct proportional relation between the magnetic induction intensity in the magnetic gap and the width of each subdivided conducting wire foil in the serial connection state, and controls the width of each subdivided conducting wire foil according to the average magnetic induction intensity at each position in the magnetic gap, so that the vibrating diaphragm provided by the invention has the same acceleration in the width direction of the magnetic gap to synchronously vibrate, and the phenomena of deformation and distortion of the vibrating diaphragm caused by non-uniform magnetic field are avoided. Meanwhile, the current of each subdivided conducting wire foil is reasonably controlled or the quality of each subdivided conducting wire foil is adjusted, so that the vibrating diaphragm can synchronously vibrate in the width direction, and the phenomena of deformation and distortion of the vibrating diaphragm caused by nonuniform magnetic field are avoided.

Drawings

Fig. 1 is a schematic structural diagram of a non-equal width divided ribbon type loudspeaker diaphragm in embodiment 1.

Fig. 2 is a schematic structural diagram of a non-equal width divided ribbon type loudspeaker diaphragm in embodiment 2.

The device comprises 1-subdivision conducting wire foil, 2-magnetic poles, 3-external connecting wires, 4-leading-out wires and 5-organic thin films.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

Example 1

The strip-type loudspeaker diaphragm divided by unequal widths as shown in fig. 1 is positioned at the center of a magnetic gap of two magnetic poles 2 of a loudspeaker, the diaphragm is composed of N parallel subdivided conducting wire foils 1, the subdivided conducting wire foils 1 are connected in series through external connecting wires 3, and after current is connected through a leading-out wire 4, the subdivided conducting wire foils 1 have synchronous acceleration in the width direction of the magnetic gap when vibrating.

In the present example, the mass of each subdivided conductor foil 1 is uniform, and the width of each subdivided conductor foil 1 is in direct proportion to the average magnetic induction at the position thereof.

In this example, the subdivided conductor foils 1 are square in cross-section.

In this example, one or both sides of the diaphragm are laminated with an organic film 5 to integrate the subdivided conductor foils 1.

Example 2

The strip-type loudspeaker diaphragm divided by unequal widths as shown in fig. 2 is positioned at the center of a magnetic gap of two magnetic poles 2 of a loudspeaker, the diaphragm is composed of even number of parallel subdivided lead foils 1, the even number of subdivided lead foils 1 form two groups of subdivided lead foils which are symmetrically distributed in the magnetic gap by a central line of the magnetic gap width, the subdivided lead foils 1 in the two groups of subdivided lead foils are mutually connected in series by an external connecting line 3, finally the two groups of subdivided lead foils are connected in parallel and are connected to an outgoing line 4, after the outgoing line is connected with current, the subdivided lead foils have synchronous acceleration in the width direction of the magnetic gap when vibrating, and simultaneously, the impedance can be reduced by half.

In the present example, and the mass of each subdivided conducting foil 1 is uniform, the width of each subdivided conducting foil 1 is in direct proportion to the average magnetic induction intensity at the position thereof.

In this example, the subdivided conductor foils 1 are square in cross-section.

Based on the above, the structure utilizes the characteristic that the current is the same in the serial connection state, so that the magnetic induction intensity in the magnetic gap is in direct proportion to the width of each subdivided conducting foil 1, and the width of each subdivided conducting foil 1 is further controlled according to the average magnetic induction intensity at each position in the magnetic gap, so that the vibrating diaphragm provided by the invention has the same acceleration in the width direction of the magnetic gap to synchronously vibrate, and the phenomena of deformation and distortion of the vibrating diaphragm caused by nonuniform magnetic field are avoided. Meanwhile, the current of each subdivided conducting wire foil 1 can be reasonably controlled or the quality of each subdivided conducting wire foil 1 can be adjusted, so that the vibrating diaphragm can synchronously vibrate in the width direction, and the phenomena of deformation and distortion of the vibrating diaphragm caused by nonuniform magnetic field are avoided.

While there have been shown and described what are at present considered the fundamental principles of the invention, its principal features and advantages, it will be understood by those skilled in the art that the invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A non-equal width divided band type loudspeaker diaphragm is positioned at the center of a magnetic gap of a loudspeaker, and is characterized in that the diaphragm consists of N parallel subdivided lead foils, and the subdivided lead foils are connected in series or in series-parallel through an external circuit, so that after current is switched in, the subdivided lead foils have synchronous acceleration in the width direction of the magnetic gap when vibrating;

the subdivided lead foils are connected in series through an external circuit, the quality of each subdivided lead foil is uniform, and the width of each subdivided lead foil is in direct proportion to the average magnetic induction intensity of the position where the subdivided lead foil is located;

when N is an even number, the N subdivided conducting wire foils form two groups of subdivided conducting wire foil groups which are symmetrically distributed in the magnetic gap from the central line of the width of the magnetic gap, the subdivided conducting wire foils in the two groups of subdivided conducting wire foil groups are mutually connected in series, and the two groups of subdivided conducting wire foil groups are connected in parallel.

2. The non-uniform width segmented ribbon loudspeaker diaphragm of claim 1 where the subdivided wire foil is square or polygonal in cross-section.

3. The unequal-width split ribbon loudspeaker diaphragm of claim 1 where an organic film is laminated to one or both sides of the diaphragm.