CN110418252B

CN110418252B - Damping short-circuit ring of electromagnetic driver

Info

Publication number: CN110418252B
Application number: CN201810390443.4A
Authority: CN
Inventors: 张百良
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-04-27
Filing date: 2018-04-27
Publication date: 2020-10-30
Anticipated expiration: 2038-04-27
Also published as: CN110418252A

Abstract

The utility model provides a damping short-circuit ring of electromagnetic driver, belongs to speaker, earphone technical field, utilizes the high damping of the high damping material of additional on the short-circuit ring, maps to the sound ring of speaker through loose coupling transformer principle, realizes not increasing the technical effect that the vibration quality obviously improved speaker damping, has solved speaker, earphone because of the poor technical problem of the transient response who brings of damping.

Description

Damping short-circuit ring of electromagnetic driver

Technical Field

Belongs to the technology of an electromagnetic driver of a loudspeaker or an earphone, in particular to a short circuit ring design compounded with damping materials.

Background

The short-circuit ring is a common design in loudspeaker design, and the classic view is that the short-circuit ring can improve hysteresis effect, reduce distortion and the like. And it is generally believed that the larger the thickness of the shorting ring or the cross-sectional area of the ring, the better to increase the shorting effect; but also close to the voice coil. The patent CN103200489B granted by the applicant proposes that a thin film type short circuit ring can be used to improve the transient response and tone quality of the speaker without affecting the performance of the speaker such as impedance curve; and because the film is adopted, the loudspeaker can be very conveniently arranged at a required position without influencing the structure of the loudspeaker, and the production and the processing are very convenient.

Disclosure of Invention

In order to further improve the tone quality, on the basis of the CN103200489B scheme, the application provides a further improved design, a damping material is compounded on a short circuit ring to form a sandwich structure, namely, two layers of films made of soft high-damping materials such as sponge or silicon rubber are sandwiched between the short circuit ring and the short circuit ring, and the three layers of materials are glued together. The short circuit ring is driven by the voice coil when vibrating, so that the short circuit ring has a movement trend, and although the movement trend can be overcome by firmly fixing the short circuit ring on a rigid component (such as gluing and the like), the movement of the voice coil cannot have any damping effect. In the sandwich-type damping design, the damping effect added to the short-circuit ring is mapped to the voice coil through a loose coupling transformer induction mechanism between the short-circuit ring and the voice coil, which is equivalent to adding a good damper to the voice coil, so that abnormal vibration (other vibration not in accordance with the driving signal) of the voice coil can be damped. The ideal loudspeaker should strictly vibrate according to the driving signal, there is no spurious vibration before vibration, there is no tail vibration after vibration, if a single square wave signal is fed, the vibration of the ideal loudspeaker should be a same single square wave; but the vibration of an actual loudspeaker is many small vibrations both in the wave front and in the wave back of the square wave. This is the leading and trailing edge response or distortion of the speaker, which is minimized by good speaker design with dangling edges and damper, but with great difficulty: large damping tends to mean a large mass, which has too much effect on the efficiency of the loudspeaker. According to the technical scheme, the damping on the short circuit ring is mapped to the voice coil through a transformer induction mechanism formed by the short circuit ring and the voice coil, the number of turns of the voice coil is dozens of to one hundred turns generally, the short circuit ring is one turn, the mapping is amplification mapping for amplifying dozens of times according to the transformer principle, namely, the damping applied to the short circuit ring can be amplified and mapped to the voice coil by dozens of times, and a very good damping effect is achieved. And because of the mapping damping, any vibration mass can not be added to the loudspeaker, and the sensitivity can not be reduced.

Besides the design of the new electromagnetic driver such as the loudspeaker and the earphone, the design can be conveniently used for the improvement of the loudspeaker and the earphone which are already produced and sold, such as the earphone which is sold on the market, the hd600 of the Senhai plug ear, and the annular sandwich type damping short circuit ring with the diameter of 40 to 30 mm is added on the sound transmission net at the back of the earphone, so that the transient state can be obviously improved, the bass is more solid and powerful, and the hearing sense is obviously improved.

Furthermore, the design can be simply popularized to any equipment which needs good damping and cannot or cannot be directly applied with damping, such as a measuring platform, a working platform and the like which are very sensitive to vibration. The damping short circuit ring and the receiving coil form a loose coupling transformer, and the damping on the short circuit ring can be amplified and mapped onto the receiving coil by the principle of transformer boosting, so that the vibration of the platform is damped in a non-contact manner, and the vibration resistance of the platform can be improved without increasing too much mass. Forming a novel non-contact short circuit ring damper.

In order to adjust the damping effect, the short circuit ring can be changed into a multi-turn short circuit coil, namely, a lead such as an enameled wire is wound into a multi-turn coil, and two ends of the coil are in short circuit. I.e. by replacing the shorted single turn coil with a shorted multi-turn coil. And the damping material is still tightly attached to the short-circuit coil, so that good damping is provided.

Drawings

FIG. 1 is a schematic view of a sandwich-type damping short-circuit ring, with a cross-sectional view below.

Fig. 2 is a schematic of a loosely coupled transformer with a voice coil.

Fig. 3 is a photograph of a commercially available headphone plus a sandwich damping shorting ring, left without front, and right with a 40 x 30 mm damping shorting ring aligned to the headphone driver on the rear cover of the headphone.

Fig. 4 shows a 50 x 44 mm sandwich damping shorting ring attached to the panel of a commercially available tweeter scan-speaker D2905/930000.

Fig. 5 is a trailing edge accumulated spectrum, colloquially referred to as a water-drop plot, for the unit of fig. 4. The upper part is provided with an undamped short-circuit ring, and the lower part is provided with a damped short-circuit ring on the panel.

Detailed Description

Example 1

As shown in fig. 3, a sandwich-type damping short-circuit ring of 40 x 30 mm was added to the back mesh of a commercially available earphone. Referring to fig. 1, the short-circuit ring 1.1 and 1.2 are two layers of damping material films, which can be made of common high-damping materials such as sponge and rubber. 1.3 is a thin film short circuit ring of good metal conductor, which is made of copper foil. The three layers of materials are bonded by gluing, or a copper foil ring is cast in the middle or the bottom/top surface of the damping material by a mould. 1.1 and 1.2 may be the same damping material of the same thickness or may be different materials and/or different thicknesses. The short circuit ring can also be designed by adopting the common structure and form of a common short circuit ring, for example, a round or rectangular lead is welded to form a circular ring, and the like, and the sandwich type damping structure can also be replaced by wrapping or sleeving a layer of damping material outside the lead, and is similar to the way that a heat-insulating sponge sleeve is sleeved on a copper pipe of an air conditioner. In this example, the short circuit ring is composed of two layers of circular sponge with the thickness of 0.3 mm, the outer diameter of 40 mm and the inner diameter of 30 mm, and a copper foil circular ring with the thickness of 30 microns, the outer diameter of 39 mm and the inner diameter of 31 mm is sandwiched between the two layers to form a damping short circuit ring with a sandwich structure, and the damping short circuit rings are glued with each other. The short circuit ring center aims at the driver setting of earphone, and the veneer covers behind the earphone, and the copper foil ring forms loose coupling transformer with the voice coil loudspeaker voice coil of driver. The actual listening test shows that the improvement is obvious, the music details are increased, the sound field width is increased, the sound image is more vivid, the tone color and the sweetness are improved, and the bass dynamics is obviously improved.

Example 2

As shown in fig. 4, a 50 × 44 mm circular sandwich-type damping short-circuit ring is attached to the panel of a general tweeter speaker, surrounding the high-pitched diaphragm and the voice coil, and the short-circuit ring and the voice coil form a loosely coupled transformer, and the short-circuit ring can be disposed at any position near the voice coil as long as the requirement of the loosely coupled transformer is satisfied. For example, three are shown in figure 2, namely, the short circuit ring is placed at the bottom, the upper part, the side surface and the like of the voice coil, and the optimized arrangement is that the short circuit ring is coaxial or basically coaxial with the voice coil. The actual sound quality of the auditory sense is obviously improved. The observed back porch cumulative spectrum, as shown in fig. 5, shows a significant improvement in back porch response.

The present design may be used for any design or modification of an electromagnetic driver including, but not limited to, the design of a speaker, an earphone or an ear plug, and further modifications of commercially available end products. While any simple improvement or degradation to the present design: if the three-layer structure is changed into a two-layer structure, a damping material circular ring and a short circuit ring are adopted; the damping material is replaced by any other common or emerging damping material; the manufacturing method is replaced by the common manufacturing method, such as gluing after punching, mould pouring, brush coating, spray coating, dip coating and the like; are within the scope of the present technology.

Claims

1. A sandwich type damping short-circuit ring of an electromagnetic driver is characterized in that the upper surface and the lower surface of the short-circuit ring made of metal good conductor foil are covered by two layers of damping materials and exert damping, and the damping is mapped to the voice coil of the driver by the loose coupling transformer.

2. The sandwich damping shorting ring as recited in claim 1 further characterized in that the two layers of damping material are of different materials and/or different thicknesses.

3. The sandwich-type damping shorting ring as defined in claim 1 wherein the damping material is die cut into a circular ring and glued to the shorting ring.

4. The sandwich-type damping short circuit ring of claim 1, wherein the damping material is applied to the short circuit ring by brushing, spraying, or dipping.

5. The sandwich-type damping short circuit ring of claim 1, wherein the short circuit ring is made of metal conductor wire or foil and is molded into the damping material to form a ring-shaped damping short circuit ring.

6. The sandwich-type damping short circuit ring as claimed in claim 1, wherein the short circuit ring is made by bending a good metal conductor wire into a ring shape and welding two ends, the damping material is in the shape of a sleeve, and the short circuit ring is sleeved on the metal wire before welding.

7. The sandwich-type damping short circuit ring of claim 1, wherein the short circuit ring is a multi-turn coil made of metal wire, and the damping material tightly covers the surface of the coil.

8. A non-contact damper of a loose coupling transformer is composed of a receiving coil and a sandwich type damping short circuit ring, wherein the receiving coil is installed on equipment needing non-contact damping, and the damping short circuit ring is installed on a base.