An easy-to-tune dynamic microphone core

Abstract

The present invention discloses a dynamic microphone core that is easy to tune, which is composed of a front cover, a sound membrane assembly, a magnetic circuit component, a middle sleeve and a tuning paper arranged on the outside of the middle sleeve in sequence; the upper end of the middle sleeve is provided with a first cavity for installing the magnetic circuit component, the side of the middle sleeve is provided with a tuning hole, and the tuning paper is correspondingly arranged on the outside of the tuning hole; a first sound inlet hole is provided on the end surface of the front cover; the cavity between the front cover and the sound membrane assembly is a front cavity, the front cavity is connected to one end of a front auxiliary cavity, and the other end of the front auxiliary cavity is connected to a second sound inlet hole, which improves the sensitivity of the dynamic microphone core, and is relatively easy to pick up bass and mid-bass that are not easy to propagate far, thereby increasing the pickup distance and pickup strength, and improving the sound quality effect. Due to the provision of the front auxiliary cavity and the second sound inlet hole, adjustment is more convenient.

Description

Technical Field

[0001] The invention relates to the technical field of microphone accessories, and in particular to a dynamic microphone core that is easy to tune. Background Art

[0002] The dynamic microphone core is an important component of the microphone. It is generally cylindrical in appearance, with a sound membrane, magnetic circuit components, tuning materials, etc. installed inside. Since the tuning structure in front of the sound membrane in the existing common dynamic microphone core structure is too simple and cannot adjust the sound, the sensitivity, pickup distance, pickup strength, sound quality, etc. of the microphone are relatively poor when used, and it is not easy to adjust. It also makes the sound sound lacking in thickness (that is, the sound is often said to be thin), affecting the sound recording quality.

[0003] Therefore, the existing dynamic microphone core structure has the above-mentioned deficiencies and needs to be improved and further developed. Summary of the invention

[0004] In order to make up for the deficiencies in the prior art, the present invention provides a dynamic microphone core that is easy to tune. By setting a front sub-cavity connected to the front cavity and adjusting the parameters of the front sub-cavity, the sensitivity, sound pickup distance, sound pickup strength, sound quality effect, etc. of the microphone can be improved.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] It includes a front cover, a sound film assembly, a magnetic circuit assembly, a middle sleeve and a tuning paper arranged outside the middle sleeve.

[0007] The upper end of the middle sleeve is provided with a first cavity for installing the magnetic circuit assembly, the side of the middle sleeve is provided with a tuning hole, and the tuning paper is correspondingly arranged on the outside of the tuning hole;

[0008] A first sound inlet hole is provided on the end surface of the front cover;

[0009] The cavity between the front cover and the sound membrane assembly is the front cavity, and the front cavity is connected to one end of the set front sub-cavity, and the other end of the front sub-cavity is connected to the second sound inlet hole.

[0010] Furthermore, the magnetic circuit assembly includes: a U-shaped cup, a positioning ring arranged in the U-shaped cup, a washer, a magnet and an iron core are arranged in the positioning ring, and an iron ring matching the U-shaped cup is arranged at the cup mouth of the U-shaped cup.

[0011] Furthermore, an induction groove is provided between the inner diameter of the iron ring and the inner diameter of the iron core.

[0012] Furthermore, the sound membrane assembly includes: a diaphragm and an induction coil arranged below the diaphragm, and the induction coil cooperates with the induction slot.

[0013] Furthermore, the front sub-cavity is arranged on the middle sleeve, and the front sub-cavity is an independent cavity on the middle sleeve.

[0014] Furthermore, the front sub-cavity is opened on the front cover, and a passage connecting the front sub-cavity and the front cavity is provided on the front cover.

[0015] Furthermore, there are one or more front auxiliary cavities.

[0016] Furthermore, a dustproof net is provided on the outer side of the front cover.

[0017] Furthermore, the first cavity and the bottom of the U-shaped cup are respectively provided with sound holes.

[0018] Furthermore, damping paper is provided at a position corresponding to the lower end of the middle sleeve and the sound hole.

[0019] The present invention discloses a dynamic microphone core that is easy to tune, which comprises a front cover, a sound membrane assembly, a magnetic circuit assembly, a middle sleeve and a tuning paper arranged on the outside of the middle sleeve in sequence; the upper end of the middle sleeve is provided with a first cavity for installing the magnetic circuit assembly, the side of the middle sleeve is provided with a tuning hole, and the tuning paper is correspondingly arranged on the outside of the tuning hole; the end face of the front cover is provided with a first sound inlet hole; the cavity between the front cover and the sound membrane assembly is a front cavity, and the front cavity is connected to one end of the arranged front sub-cavity, and the other end of the front sub-cavity is connected to the second sound inlet hole, which has the advantages of: 1. The front sub-cavity and the second sound inlet hole thereon are added, and the sound wave airflow flowing to the front cavity is enhanced through the front sub-cavity. When acting on the sound membrane assembly, the volume velocity through the sound membrane assembly will increase, so that the induced electromotive force will increase accordingly, thereby improving the sensitivity of the dynamic microphone core. 2. Since the front sub-cavity is connected to the front cavity, it can be roughly regarded as the increase of the front cavity sound volume, and the acoustic compliance is reduced accordingly. When picking up low-frequency and mid-low frequency sounds, the impedance value of the sound wave airflow to the sound film is reduced, and the volume velocity acting on the sound film is increased accordingly, and the relative sensitivity is improved. Therefore, it is relatively easy to pick up bass and mid-bass that are not easy to spread far, which improves the pickup distance and pickup strength. 3. By setting the acoustic parameters of the front sub-cavity and its upper sound inlet, the low-frequency sound can be made soft, deep, strong and thick while maintaining the width, and the mid-range can be made full, powerful and smooth when connecting the bass and treble. The mid-high and treble can be easily bright, round and transparent without thinness and burrs, which improves the sound quality. 4. Since the front sub-cavity and the second sound inlet are set, the parameters of the dynamic microphone can be easily adjusted by changing the opening size, opening position and other parameters of the front sub-cavity and the second sound inlet, making the microphone adjustment easier. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 An exploded view of an easily tunable dynamic microphone core provided by the present invention;

[0021] Figure 2A three-dimensional cross-sectional view of an easily tunable dynamic microphone core provided by the present invention;

[0022] Figure 3 An assembly cross-sectional view of an easily tunable dynamic microphone core provided by the present invention;

[0023] Figure 4 A cross-sectional view of a middle sleeve of a dynamic microphone core that is easy to tune provided by the present invention;

[0024] Figure 5 An exploded view of another embodiment of an easy-to-tune dynamic microphone core provided by the present invention;

[0025] Figure 6 In another embodiment of the present invention, a dynamic microphone core that is easy to tune has a three-dimensional front cover. Figure 1 ;

[0026] Figure 7 In another embodiment of the present invention, a dynamic microphone core that is easy to tune has a three-dimensional front cover. Figure 2 . DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The present invention provides a dynamic microphone core that is easy to tune, and its structure is as follows: Figure 1-Figure 7 As shown,

[0029] The invention comprises: a front cover 10, a sound membrane assembly 20, a magnetic circuit assembly 30, a middle sleeve 40 and a tuning paper 50 arranged on the outside of the middle sleeve 40, which are arranged in sequence; a first cavity 41 for installing the magnetic circuit assembly is provided on the upper end of the middle sleeve 40, a tuning hole 42 is provided on the side of the middle sleeve 40, and the tuning paper 50 is correspondingly arranged on the outside of the tuning hole 42, and the dynamic microphone core is tuned by the tuning paper.

[0030] A first sound inlet hole 11 is provided on the end surface of the front cover 10;

[0031] The cavity between the front cover 10 and the sound membrane assembly 20 is a front cavity 1 , and the front cavity 1 is connected to one end of a front sub-cavity 2 , and the other end of the front sub-cavity 2 is connected to a second sound inlet hole 12 .

[0032] Specifically, the magnetic circuit assembly 30 includes: a U-shaped cup 31, a positioning ring 32 arranged in the U-shaped cup 31, a washer 33, a magnet 34 and an iron core 35 are arranged in the positioning ring 32, and an iron ring 36 that cooperates with the U-shaped cup 31 is arranged at the cup mouth of the U-shaped cup 31, and the inner diameter of the iron ring 36 is set corresponding to the inner diameter of the iron core 35, and an induction groove 37 is provided between the two, and the inner diameter of the iron ring 36 and the iron core 35 form corresponding N and S poles.

[0033] Specifically, the sound membrane assembly 20 includes: a diaphragm 21 and an induction coil 22 arranged below the diaphragm 21, the induction coil 22 cooperates with the induction slot 37, the diaphragm 21 is used to receive the vibration of sound waves and transmit the vibration to the induction coil 22 arranged below it, thereby driving the induction coil 22 to vibrate in the induction slot 37.

[0034] The working principle of the dynamic microphone is as follows: the sound waves emitted by the sound source reach the sound inlet holes on the sides and bottom of the front cover and the middle sleeve respectively. Due to the phase difference of the sound waves and the attenuation of the sound energy during propagation, there is a sound pressure difference between the sound inlet holes, which causes the sound pressure on the front and back sides of the sound membrane to be unbalanced, thus causing vibration. The vibration of the diaphragm drives the coil attached to the diaphragm to vibrate in the magnetic gap formed by the N and S poles of the magnetic circuit, cutting the magnetic lines of force and generating an induced current in the coil, thereby generating an alternating voltage output corresponding to the sound wave frequency at both ends of the coil, converting the vibration signal of the sound wave into an alternating electrical signal, thus realizing the sound collection.

[0035] Specifically, in order to simplify the structure of the dynamic microphone, the front sub-cavity 2 is arranged on the middle sleeve 40. Since the middle sleeve 40 is generally injection-molded by plastic material, the process of opening the front sub-cavity 2 thereon is relatively simple. The front sub-cavity 2 is an independent cavity on the middle sleeve 40 and does not intersect with other structures on the middle sleeve 40, so as to prevent other structures from interfering with the structure and function of the front sub-cavity 2.

[0036] Specifically, in another embodiment, Figure 5-Figure 7 As shown, if the side wall of the middle sleeve 40 is relatively thin or it is difficult to set the front sub-cavity 2, the front sub-cavity 2 is opened on the front cover 10, and a channel 13 connecting the front sub-cavity 2 and the front cavity 1 is provided on the front cover 10, so that the front sub-cavity 2 can also play a corresponding role.

[0037] Specifically, according to actual needs or product structure, the front auxiliary chamber 2 can be provided as one or more, and its shape can be cylindrical, cubic or other irregular shapes.

[0038] The present application breaks the previous structural setting of the dynamic microphone, that is, people used to only set a front cavity before the front cover 10 and the sound membrane combination 20 to introduce sound waves, and generally made adjustments to the structure of the coil and the middle sleeve. This adjustment is not only inconvenient to adjust, but also has poor sound pickup distance, sound pickup strength and sound quality. However, due to the existence of the front auxiliary cavity, the present application increases the sound mass impedance acting on the front cavity overall. The sound mass impedance is opposite to the sound compliance impedance. At a certain frequency, the impedance value approaches zero and the impedance value approaches the minimum, so that the impedance value encountered by the sound wave airflow to the sound membrane is minimized, and the effect on the sound membrane is maximized, which correspondingly improves the sensitivity near a certain frequency; the range near this certain frequency is set as the mid- and low-frequency band of the main sound of human voice, thereby improving the sound pickup strength.

[0039] On the other hand, since the front sub-cavity 2 is connected to the front cavity 1, it can be approximately regarded as that the sound capacity of the front cavity is increased, and the acoustic compliance is correspondingly reduced. When picking up low-frequency and mid-low frequency sounds, the impedance value of the sound wave airflow to the sound membrane is reduced, and the volume velocity acting on the sound membrane is correspondingly increased, and the relative sensitivity is improved. Therefore, it is relatively easy to pick up the bass and mid-bass that are not easy to propagate far, and the sound pickup distance and sound pickup strength are improved. In addition, by setting the front sub-cavity 2, the low-frequency sound can be made soft, deep, strong and thick while maintaining the width, and the mid-range can be made full, powerful, smooth and smooth when connecting the bass and treble, and the mid-high and treble can be made bright, round and transparent without a sense of thinness or burrs, thereby improving the sound quality effect.

[0040] As the enameled wire becomes thinner and thinner (because it can maximize the frequency response range, especially the width to the high frequency), its sound quality becomes smaller and smaller, and it becomes increasingly difficult to achieve the desired tuning effect by adjusting the acoustic structure behind the sound membrane. Therefore, it is particularly important to set a front sub-cavity in the cavity position in the present application, eliminating the technical discrimination of existing technicians in adjusting sound through the front cavity.

[0041] Specifically, a dustproof net 14 is also provided on the outside of the front cover 10 to prevent foreign matter from entering the front cavity 1 from the first sound inlet hole 11 on the front cover 10, thereby affecting the vibration effect of the sound membrane assembly 20 and ultimately affecting the sound collection. The dustproof net 14 can be made of dustproof cloth or metal mesh.

[0042] Specifically, the bottoms of the first cavity 41 and the U-shaped cup 31 are respectively provided with sound holes, and damping paper 60 is provided at the lower end of the middle sleeve 40 corresponding to the sound holes. The damping paper 60 is fitted to the sound holes at the lower end of the middle sleeve 40 to generate sound resistance. Since the sound resistance at the rear end of the middle sleeve 40 is much greater than the sound resistance of the first sound inlet hole 11 on the front cover 10, a sound pressure difference is generated on both sides of the sound membrane assembly 20.

[0043] In summary, the present invention provides an easy-to-tune dynamic microphone core, which is composed of a front cover, a sound membrane assembly, a magnetic circuit assembly, a middle sleeve and a tuning paper arranged on the outside of the middle sleeve in sequence; the upper end of the middle sleeve is provided with a first cavity for installing the magnetic circuit assembly, the side of the middle sleeve is provided with a tuning hole, and the tuning paper is correspondingly arranged on the outside of the tuning hole; a first sound inlet hole is provided on the end face of the front cover; the cavity between the front cover and the sound membrane assembly is a front cavity, and the front cavity is connected to one end of the front sub-cavity, and the other end of the front sub-cavity is connected to the second sound inlet hole, which improves the sensitivity of the dynamic microphone core, and is relatively easy to pick up bass and mid-bass that are not easy to spread far, thereby increasing the pickup distance and pickup strength, and improving the sound quality effect. Due to the provision of the front sub-cavity and the second sound inlet hole, adjustment is more convenient.

[0044] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A dynamic microphone core that is easy to tune, characterized by: It includes a front cover, a sound film assembly, a magnetic circuit assembly, a middle sleeve and a tuning paper arranged outside the middle sleeve. The upper end of the middle sleeve is provided with a first cavity for installing the magnetic circuit assembly, the side of the middle sleeve is provided with a tuning hole, and the tuning paper is correspondingly arranged on the outside of the tuning hole; A first sound inlet hole is provided on the end surface of the front cover; The cavity between the front cover and the sound membrane assembly is the front cavity, the front cavity is connected to one end of the front sub-cavity, and the other end of the front sub-cavity is connected to the second sound inlet hole; The front sub-cavity is arranged on the middle sleeve, the front sub-cavity is an independent cavity on the middle sleeve, or the front sub-cavity is opened on the front cover, and a channel connecting the front sub-cavity and the front cavity is arranged on the front cover.

2. The easily tunable dynamic microphone core according to claim 1, characterized in that: The magnetic circuit assembly comprises: a U-shaped cup, a positioning ring arranged in the U-shaped cup, a washer, a magnet and an iron core are arranged in the positioning ring, and an iron ring matching the U-shaped cup is arranged at the cup mouth of the U-shaped cup.

3. The easy-to-tune dynamic microphone core according to claim 2, characterized in that: An induction groove is provided between the inner diameter of the iron ring and the inner diameter of the iron core.

4. The easy-to-tune dynamic microphone core according to claim 3, characterized in that: The sound membrane assembly comprises: a diaphragm and an induction coil arranged below the diaphragm, and the induction coil cooperates with the induction slot.

5. The easy-to-tune dynamic microphone core according to claim 1, characterized in that: There are one or more front auxiliary chambers.

6. The easy-to-tune dynamic microphone core according to claim 1, characterized in that: A dustproof net is also arranged on the outer side of the front cover.

7. The easy-to-tune dynamic microphone core according to claim 1, characterized in that: The first cavity and the bottom of the U-shaped cup are respectively provided with sound holes.

8. The easily tunable dynamic microphone core according to claim 7, characterized in that: Damping paper is arranged at a position corresponding to the sound hole at the lower end of the middle sleeve.

Images