TW201541974A - Microphone with multiple sound receivers - Google Patents

Abstract

A microphone with multiple sound receivers includes a plurality of sound receiving units and a back chamber base. The plurality of sound receiving units are directional; each of the sound receiving units includes a sound receiving top face and a sound receiving periphery face; the back chamber base includes a bottom wall, a periphery wall extending upwardly from the periphery of the bottom wall, a plurality of installation through holes for the setting of the sound receiving units, at least one separation concave wall defining the installation through holes in conjunction with the periphery wall, and a sound chamber connecting the installation through holes. The effect of the present invention is characterized in that the sound receiving units share the back chamber base for the reduction of material cost, assembly working hours and assembly cost. Besides, the volume of the sound chamber is large enough to keep the quality of low frequency sound. Furthermore, the air permeability of the sound receiving faces of the sound receiving units can be enhanced through the separation concave wall, so as to enhance the directionality.

Description

Multi-head microphone

The invention relates to a microphone, in particular to a multi-head microphone with good directivity.

In the past, a multi-head microphone, as disclosed in the patent US 4888807, is composed of three capacitive heads with different directivity, and uses a switch to charge signals of different heads to achieve different directivity effects.

However, the disadvantages of the prior patents are that the aforementioned sound heads are respectively disposed on the three back chambers, which increases the material cost, assembly man-hour, assembly cost due to the large number of parts in manufacturing and assembly, and is limited by the upper limit of the volume of the microphone. However, the volume of each back cavity must be reduced to affect the low frequency sound quality.

Accordingly, it is an object of the present invention to provide a multi-tone microphone that is low in cost and excellent in sound quality.

Therefore, the multi-head microphone of the present invention comprises a plurality of head units and a back chamber, each of the head units having directivity, each head comprising a radio top surface and a radio peripheral surface, the back chamber including a bottom wall a peripheral wall extending upward from a periphery of the bottom wall, a plurality of mounting through holes respectively for mounting the acoustic head units, and at least one defining the mounting together with the peripheral wall a partitioning concave wall of the through hole, and a sound chamber that communicates with the mounting through holes.

The effect of the invention is that the use of the head unit is a feature of sharing the back cavity to reduce material cost, assembly man-hours, assembly cost, and the volume of the sound cavity is large enough to maintain low-frequency sound quality, and the separation is achieved by the separation. The concave wall increases the air permeability of the sound receiving peripheral surface of the acoustic head unit, thereby improving directivity.

1‧‧‧ head unit

11‧‧‧ Radio top

12‧‧‧ Radio surface

13‧‧‧ coil

14‧‧‧Densor

15‧‧‧ permanent magnet

2‧‧‧Back seat

21‧‧‧ bottom wall

22‧‧‧Week wall

23‧‧‧Installation through hole

24‧‧‧ partition wall

25‧‧‧ sound chamber

3‧‧‧Link positioning unit

31‧‧‧ lugs

Other features and advantages of the present invention will be apparent from the embodiments of the present invention, wherein: FIG. 1 is a perspective view showing a preferred embodiment of the multi-speaker microphone of the present invention; and FIG. 2 is a cross-sectional view. BRIEF DESCRIPTION OF THE DRAWINGS A plurality of head units and a back chamber of the preferred embodiment are illustrated. Annex 1 is a bar graph of the suppression of the single-head and multi-head in different concave depths.

Referring to Figures 1 and 2, the multi-head microphone of the present invention comprises a plurality of head units 1, and a back chamber 2 for sharing the head units 1 with each other.

The head units 1 all have directivity, and the directivity is used to describe the sensitivity of the microphone to sounds from different angles. In the preferred embodiment, the heads have the same directivity, and the sound from the front of the microphone is optimal. The sound of the sound, while the sound from other directions will be attenuated, commonly seen in handheld microphones, where each sound head includes a a top surface 11 and a sound receiving surface 12, and the sound receiving peripheral surfaces 12 of the head units 1 are more than 3 mm apart from each other, and the width of the wires is about 1 mm, in series with the head units 1 In the case of three wires, a distance of more than 3 mm is preferred.

The head unit 1 is a dynamic microphone, and further includes a coil 13, a diaphragm 14, and a permanent magnet 15. When the sound wave enters the microphone, the diaphragm 14 is generated by the pressure of the sound wave. Vibrating, the coils 13 respectively connected to the diaphragms 14 start to vibrate in the magnetic fields of the permanent magnets 15, respectively, according to the Faraday's law of electromagnetic induction and the cold law (Lenz's law). ), the coils 13 generate an induced electromotive force.

It is worth mentioning that the head units 1 are connected in series with each other, so that the induced electromotive force generated by the coils 13 of the head unit 1 can be increased, and the induced electromotive force generated by the increased unit sound pressure can be obtained. Increase sensitivity.

In addition to the series connection, the head units 1 may also be connected by an adder.

The back chamber 2 includes a bottom wall 21, a peripheral wall 22 extending upward from the periphery of the bottom wall 21, and a plurality of mounting through holes 23 respectively for the head unit 1 to be mounted, at least one of which together with the peripheral wall 22 defines the same The partitioning recess 24 of the through hole 23 is mounted, and a sound chamber 25 communicating with the mounting through holes 23 is provided.

Referring to the accessory 1, in the preferred embodiment, the depth of the partitioning recess 24 of the back chamber 2 is greater than 10 mm, and the width is the distance from the sound receiving peripheral surface 12 of the head unit 1. Roughly the same, which can improve The air permeability of the sound receiving peripheral surface 12 of the head unit 1 further improves the directivity, and the principle is that, when the air permeability is increased, more sound pressure can be entered into the sound receiving peripheral surface 12 of the head unit 1. It can offset the positive sound pressure of the radio top surface 11 to achieve the directional characteristics. In Annex 1, the test instrument is B&K audio analyzer 2012, the test condition is IEC 268-4, and the concave depth of the single head is 8 mm. When it is 1 kHz, it can suppress 23.9 decibels (dB). If the depth of the partition wall 24 of the back cavity 2 is only 3 mm or 5 mm, it can only suppress 16.9 decibels and 21.2 decibels at 1 kHz. It failed to exceed 23.9 decibels, and when it reached 10 mm, it inhibited 27.1 decibels at 1 kHz, which had better directivity.

The connection positioning unit 3 is configured to connect the back cavity 3 and the external structure to fix the multi-head microphone in an appropriate position. The connection positioning unit 3 includes a plurality of lugs 31 integrally formed on the back cavity.

In the preferred embodiment, the height of the lugs 31 does not exceed the height of the back cavity 2, and the number of the lugs 31 is four and is respectively located at four corners to prevent sound waves from being hindered and affecting the pointing. Sex.

In summary, the multi-head microphone of the present invention has the following effects:

1. The use of the head unit 1 is to share the characteristics of the back chamber 2 to reduce material cost, assembly man-hours, and assembly costs.

2. The volume of the sound chamber 25 of the back chamber 2 is large enough to maintain low frequency sound quality.

3. The air permeability of the sound receiving peripheral surface 12 of the head unit 1 is increased by the partition concave wall 24 of the back chamber base 2, thereby improving directivity.

However, the above is only the preferred embodiment of the present invention. The scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the present invention in the scope of the invention and the patent specification are still within the scope of the invention.

1‧‧‧ head unit

11‧‧‧ Radio top

12‧‧‧ Radio surface

13‧‧‧ coil

14‧‧‧Densor

15‧‧‧ permanent magnet

2‧‧‧Back seat

21‧‧‧ bottom wall

22‧‧‧Week wall

23‧‧‧Installation through hole

24‧‧‧ partition wall

25‧‧‧ sound chamber

3‧‧‧Link positioning unit

31‧‧‧ lugs

Claims (8)

A multi-head microphone comprising: a plurality of head units each having directivity, each head comprising a radio top surface and a radio peripheral surface; and a back chamber including a bottom wall extending upward from a periphery of the bottom wall The peripheral wall and the plurality of mounting through holes respectively for the head unit are mounted, at least one partitioning concave wall defining the mounting through holes together with the peripheral wall, and a sound chamber communicating with the mounting through holes. The multi-tone microphone according to claim 1, wherein the sound receiving circumferential surfaces of the acoustic head units are apart from each other by more than 3 mm. The multi-tone microphone of claim 1, wherein the partitioning recess of the back chamber has a depth of more than 10 mm. The multi-tone head microphone of claim 1, wherein the head units have the same directivity. The multi-tone head microphone according to claim 1, wherein the head units are moving coil type heads connected in series with each other, and may also be moving coil type heads connected by an adder. The multi-tone head microphone of claim 1, wherein the head units are moving coil type heads connected by an adder. The multi-tone head microphone of claim 1, further comprising a joint positioning unit for joining the back cavity seat and the outer structure, the joint positioning unit comprising a plurality of lugs integrally formed on the back cavity seat. The multi-tone microphone of claim 7, wherein the height of the lugs does not exceed the height of the back cavity.