A condenser microphone with a new type of diaphragm electrode plate

Abstract

The present invention discloses a condenser microphone with a new type of microphone plate electrode, which includes a microphone plate electrode. A first diaphragm clamping ring and a second diaphragm clamping ring are respectively arranged on the upper and lower sides of the microphone plate electrode. A gold-plated film is covered on the first diaphragm clamping ring, and a diaphragm is covered on the second diaphragm clamping ring. The gold-plated film is connected to a first microphone wire, and the microphone plate electrode is connected to a second microphone wire. A plurality of stepped through-holes and a plurality of blind holes are distributed on the upper surface of the microphone plate electrode. The plurality of stepped through-holes include a first through-hole arrangement, two second through-hole arrangements, and two third through-hole arrangements. One second through-hole arrangement and one third through-hole arrangement are symmetrically arranged on both sides of the first through-hole arrangement as a group, and the second through-hole arrangement is arranged between the first through-hole arrangement and the third through-hole arrangement. The advantage is that the condenser microphone has better directivity indexes.

Description

Technical Field

[0001] The present invention relates to the field of microphones, and more particularly to a condenser microphone with a new type of microphone head plate. Background Art

[0002] A microphone is a common sound receiving device, and its function is to convert sound signals into electrical signals. The directivity of a microphone is a description of the sensitivity pattern of the microphone to sounds from various directions in space, and it is an important property of the microphone. If a microphone has no directivity index, the acceptance sensitivity of the microphone in all directions is the same, then it is easy to cause feedback, resulting in a harsh whistling sound from the speaker. The quality of the microphone directivity depends on the microphone head plate, especially the through holes provided on the plate.

[0003] The invention with Chinese Patent No. 200720068553.6 discloses a microphone head plate, specifically a microphone head plate, which includes stepped through holes, blind holes, threaded holes, inclined grooves, threaded blind holes and insulating columns. A central hole is opened in the central part of the plate, and a plurality of stepped through holes and blind holes are arranged around the central hole. Its characteristics are: the arrangement of the stepped through holes and blind holes is symmetric with respect to the horizontal line and vertical line of the center of the plate, the outer shape is arranged in an octagon, and the stepped through holes and blind holes are arranged at equal distances and staggered in the axial direction of 45° of the horizontal line and also in the axial direction of 135° of the horizontal line; compared with the prior art, the present invention has a simple and novel structure, good 0° frequency response characteristics, large 180° attenuation, good directivity, and improved reliability and moisture resistance.

[0004] In addition to the arrangement of the microphone head plates disclosed in the above patent documents, there are also a large number of microphone head plates with various arrangements on the market. The purpose of the present invention is to develop a brand-new microphone head plate. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a condenser microphone with a brand-new microphone head plate, and the condenser microphone of the present invention has better directivity index.

[0006] The technical solution adopted by the present invention to solve the above technical problem is: a condenser microphone with a new type of microphone head plate, including a microphone head plate. A first diaphragm pressing ring and a second diaphragm pressing ring are respectively arranged on the upper and lower sides of the microphone head plate. A gold-plated film is covered on the first diaphragm pressing ring, and a diaphragm is covered on the second diaphragm pressing ring. The gold-plated film is connected to a first microphone wire, the microphone head plate is connected to a second microphone wire, and a plurality of stepped through holes and a plurality of blind holes are distributed on the upper surface of the microphone head plate. The plurality of stepped through holes are characterized in that they include a first through hole arrangement, two second through hole arrangements and two third through hole arrangements. One second through hole arrangement and one third through hole arrangement are symmetrically arranged on both sides of the first through hole arrangement, and the second through hole arrangement is arranged between the first through hole arrangement and the third through hole arrangement.

[0007] A further preferred embodiment of the present invention is that: an insulating column is provided at the central position of the sound head electrode plate, a central fixing hole is provided in the middle of the insulating column, and the connecting line of the first through holes arranged passes through the central fixing hole.

[0008] A further preferred embodiment of the present invention is that: the first through holes are arranged in a straight line, and the arrangement of the first through holes includes 6 stepped through holes, and three stepped through holes are in a group and are respectively arranged on both sides of the central fixing hole.

[0009] A further preferred embodiment of the present invention is that: the distance between the fixing hole and the arrangement of the nearest first through holes is 4 - 4.5 mm, and the distance between two adjacent stepped through holes in the arrangement of the first through holes is 2.5 - 3 mm.

[0010] A further preferred embodiment of the present invention is that: the arrangement of the second through holes includes four stepped through holes, and two stepped through holes are in a group to form two groups of stepped through holes, and the connecting line of the two groups of stepped through holes forms an included angle of 140 - 150 degrees.

[0011] A further preferred embodiment of the present invention is that: the distance between the two stepped through holes is 4 - 5 mm.

[0012] A further preferred embodiment of the present invention is that: the arrangement of the third through holes includes five stepped through holes, and the five stepped through holes include a middle through hole and four side through holes, and two side through holes are in a group to form two groups of side stepped through holes, and the two groups of side stepped through holes form an included angle of 85 - 95 degrees at the middle through hole.

[0013] A further preferred embodiment of the present invention is that: the distance between the two stepped through holes is 3.5 - 4.5 mm.

[0014] A further preferred embodiment of the present invention is that: the stepped through hole includes a large through hole and a small through hole, the diameter of the large through hole is 1 - 2 mm, and the diameter of the small through hole is 0.5 - 1 mm.

[0015] A further preferred embodiment of the present invention is that: a metal gasket is provided above the gold-plated diaphragm, an insulating column with a fixing hole is provided at the center of the sound head electrode plate, a central screw passes through the metal gasket and is inserted into the fixing hole of the sound head electrode plate, and the first sound head wire is connected to the central screw.

[0016] The present invention provides a brand-new distribution method of stepped through holes and blind holes of a sound head electrode plate, and through testing, the present invention has good directivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a perspective view of a condenser sound head;

[0018] Figure 2 is a bottom view of a condenser sound head;

[0019] Figure 3 is the stepped via hole distribution of the head plate Figure 1 ;

[0020] Figure 4 is the stepped via hole distribution of the head plate Figure 2 ;

[0021] Figure 5 is the exploded view of the condenser microphone head;

[0022] Figure 6 is the three-dimensional view of the washer;

[0023] Figure 7 is the test polarity diagram of the microphone head of the existing design;

[0024] Figure 8 is the test polarity diagram of the microphone head of the present invention. Specific embodiments

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] Such as Figures 1 - 5As shown in the figure, a condenser microphone with a new type of microphone plate includes a microphone plate 1, which is generally made of copper. A first diaphragm pressing ring 2 and a second diaphragm pressing ring 3 are respectively arranged on the upper and lower sides of the microphone plate 1. The first diaphragm pressing ring 2 and the second diaphragm pressing ring 3 are fixed on the microphone plate 1 by screws. A gold-plated film 4 is covered on the first diaphragm pressing ring 2. Thus, the gap between the gold-plated film 4 and the microphone plate 1 changes, causing the capacitance to change. The second diaphragm pressing ring 3 covers the diaphragm 5. The gold-plated film 4 is connected to the first microphone wire 6, and the first microphone wire 6 is the positive wire. The microphone plate 1 is connected to the second microphone wire 7, and the second microphone wire 7 is the negative wire. Multiple stepped through-holes 8 and multiple blind holes 9 are distributed on the upper surface of the microphone plate 1. The stepped through-hole 8 refers to a hole that connects the front and back sides with different sizes, and the blind hole 9 refers to a hole that does not connect the front and back sides. The multiple stepped through-holes 8 include a first through-hole arrangement 10, two second through-hole arrangements 11, and two third through-hole arrangements 12. One second through-hole arrangement 11 and one third through-hole arrangement 12 are symmetrically arranged on both sides of the first through-hole arrangement 10 as a group, and the second through-hole arrangement 11 is arranged between the first through-hole arrangement 10 and the third through-hole arrangement 12. An insulating column 13 is arranged at the central position of the microphone plate 1, and a central fixing hole 14 is arranged in the middle of the insulating column 13. The connection line of the first through-hole arrangement 10 passes through the central fixing hole 14. The first through-hole arrangement 10 is linear. The first through-hole arrangement includes 6 stepped through-holes 8, and three stepped through-holes 8 are arranged as a group on both sides of the central fixing hole 14 respectively. The distance between the central fixing hole 14 and the nearest first through-hole arrangement 10 is 4 - 4.5 mm, preferably 4.2 mm. The distance between two adjacent stepped through-holes 8 in the first through-hole arrangement 10 is 2.5 - 3 mm, preferably 2.8 mm. The second through-hole arrangement 11 includes 4 stepped through-holes 8. Two stepped through-holes 8 form two groups of stepped through-holes 81 as a group. The connection line of the two groups of stepped through-holes 81 forms an included angle B of 140 - 150 degrees, preferably 143.1 degrees. The distance between two stepped through-holes 8 in each group is 4 - 5 mm, preferably 4.4 mm. The third through-hole arrangement 12 includes 5 stepped through-holes 8. The 5 stepped through-holes 8 include an intermediate through-hole 15 and four side through-holes 16. Two side through-holes 16 form two groups of side stepped through-holes 82 as a group. The two groups of side stepped through-holes 82 form an included angle A of 85 - 95 degrees at the intermediate through-hole 15, preferably 90 degrees. The distance between two stepped through-holes 8 in each group is 3.5 - 4.5 mm, preferably 4 mm. The stepped through-hole 8 includes a large through-hole and a small through-hole. The diameter of the large through-hole is 1 - 2 mm, preferably 1.5 mm, and the diameter of the small through-hole is 0.5 - 1 mm, preferably 0.85 mm.

[0027] Through specific embodiments of the present invention, the directivity is tested by using a professional instrument to test the microphone polar pattern. We judge the quality of the directivity by the shape of the polar pattern at different frequencies. The sound frequencies are generally divided into 500 Hz (A), 1000 Hz (B), 2000 Hz (C), and 4000 Hz (D), and the indicators of 500 Hz and 1000 Hz are particularly important. The distinction between good and bad directivity mainly depends on whether the shape of the test pattern can be close to a heart shape, which is called a cardioid pattern. The advantages of the cardioid pattern are obvious. It picks up the sound in the area you point to while ignoring other sounds. It is particularly suitable for the following situations: When recording a drum set, there are so many components closely together that it seems impossible to isolate them one by one. However, this can be achieved by using an appropriate cardioid microphone and the correct position and angle. In a live performance on stage, where sound comes from all directions, the cardioid pattern can play a good isolation role to prevent feedback. In a poor acoustic field environment, using a cardioid microphone at a short distance in a room with a poor sound field helps to reduce the pickup of reflected sounds. Figure 7 is a polar pattern of the prior art, and its 500 Hz and 1000 Hz frequency bands are both close to circular, with poor directivity. Figure 8 is the polar pattern tested by the present invention, and its 500 Hz and 1000 Hz frequency bands are both close to a heart shape, with good directivity.

[0028] As Figure 1 、 Figure 3 shown, a metal gasket 18 is arranged above the gold-plated diaphragm 4, and an insulating column 13 with a central fixing hole is arranged in the center of the microphone head electrode plate 1. The central screw 17 passes through the metal gasket 18 and is inserted into the central fixing hole of the microphone head electrode plate 1, and the first microphone head wire 6 is connected to the central screw 17, so that the first microphone head wire 6 is connected to the metal gasket 18. A circle of through holes is evenly distributed on the upper part of the first diaphragm pressing ring 2, and a circle of edge fixing holes 19 is arranged on the edge of the microphone head electrode plate 1. The edge screw 20 passes through the through hole and enters the edge fixing hole 19, and the second microphone head wire 7 is connected to the edge screw 20, so that the second microphone head wire 7 is connected to the microphone head electrode plate 1.

[0029] As Figure 2 shown, the upper surface of the microphone head electrode plate 1 faces the first diaphragm pressing ring 2. The upper surface of the microphone head electrode plate 1 includes a central area and an edge area. A circle of protrusions is arranged in the edge area, so as to form a gap between the gold-plated diaphragm 4 and the central area. Compared with the traditional microphone head electrode plate 1, the intermediate gasket structure is omitted, making the assembly simple and the cost lower. The height of the circle of protrusions is 0.03 - 0.05 mm, preferably 0.04 mm. A washer 21 is arranged between the microphone head electrode plate 1 and the second diaphragm pressing ring 3, and the washer 21 is used to form a gap between the microphone head electrode plate 1 and the second diaphragm pressing ring 3.

[0030] As Figure 6As shown, a notch 22 communicating the inside and outside of the washer 21 is provided. The airflow generated by the vibration of the sound leaks to the outside from the notch, enhancing the directivity of the sound head. The notch is a parallel gap with a pitch of 0.3 - 0.5 mm, preferably 0.4 mm. The extension direction of the notch forms an angle of 35 - 55 degrees, preferably 45 degrees, with the radial direction of the washer.

[0031] The above has introduced in detail a condenser microphone with a new type of sound head electrode plate provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the present invention and its core idea. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A capacitor microphone with a new type of microphone head plate, comprising a microphone head plate, a first diaphragm pressing ring and a second diaphragm pressing ring are respectively arranged on the upper and lower sides of the microphone head plate, a gold-plated film is covered on the first diaphragm pressing ring, a diaphragm is covered on the second diaphragm pressing ring, the gold-plated film is connected to a first microphone head wire, the microphone head plate is connected to a second microphone head wire, and a plurality of stepped through holes and a plurality of blind holes are distributed on the upper surface of the microphone head plate, characterized in that The multiple stepped through-holes include a first through-hole arrangement, two second through-hole arrangements, and two third through-hole arrangements. One second through-hole arrangement and one third through-hole arrangement are symmetrically arranged on both sides of the first through-hole arrangement as a group, and the second through-hole arrangement is arranged between the first through-hole arrangement and the third through-hole arrangement; the first through-hole arrangement is linear, and the first through-hole arrangement includes 6 stepped through-holes, and three stepped through-holes are arranged as a group on both sides of the central fixing hole respectively; one of the second through-hole arrangements includes 4 stepped through-holes, and two stepped through-holes are grouped into two groups of stepped through-holes, and the connection line of the two groups of stepped through-holes forms an angle of 140-150 degrees; one of the third through-hole arrangements includes 5 stepped through-holes, and the 5 stepped through-holes include an intermediate through-hole and 4 side through-holes, and two side through-holes are grouped into two groups of side stepped through-holes, and the two groups of side stepped through-holes form an angle of 85-95 degrees at the intermediate through-hole.

2. The capacitance microphone with a new type of diaphragm electrode plate according to claim 1, characterized in that An insulating column is provided at the central position of the sound head electrode plate, a central fixing hole is provided in the middle of the insulating column, and the connection line of the first through-hole arrangement passes through the central fixing hole.

3. The condenser microphone with a new type of diaphragm electrode plate according to claim 1, characterized in that The distance between the fixing hole and the nearest first through-hole arrangement is 4-4.5 mm, and the distance between two adjacent stepped through-holes in the first through-hole arrangement is 2.5-3 mm.

4. The capacitance microphone with a new type of head plate according to claim 1, characterized in that The distance between two adjacent stepped through-holes in each group of the second through-hole arrangement is 4-5 mm.

5. A capacitor microphone with a new type of diaphragm electrode plate according to claim 1, characterized in that The distance between two adjacent stepped through-holes in each group of the third through-hole arrangement is 3.5-4.5 mm.

6. The capacitance microphone with a new type of sound head electrode plate according to claim 1, characterized in that The stepped through-hole includes a large through-hole and a small through-hole, the diameter of the large through-hole is 1-2 mm, and the diameter of the small through-hole is 0.5-1 mm.

7. A capacitor microphone with a new type of capsule electrode plate according to claim 1, characterized in that A metal gasket is provided above the gold-plated diaphragm, an insulating column with a fixing hole is provided in the center of the sound head electrode plate, a central screw passes through the metal gasket and is inserted into the fixing hole of the sound head electrode plate, and the first sound head wire is connected to the central screw.

Images